Ophthalmology – Salzmann’s Nodular Degeneration

What the Corneal Lesion Represents

Salzmann’s nodular degeneration (SND) is an acquired, usually slowly progressive corneal degeneration characterized by one or more:

• Smooth, elevated subepithelial nodules
• Creamy white, gray-white, yellow-white, or occasionally bluish lesions

The nodules lie anteriorly, typically between the:

Corneal epithelium and Bowman layer

They are most often found in the:

• Peripheral cornea
• Midperipheral cornea

but may become:

• Paracentral
• Central

When central or sufficiently large, they can cause significant visual disturbance through:

Irregular astigmatism and alteration of corneal curvature.

Who Most Commonly Develops It

SND is uncommon, although its exact prevalence is uncertain.

It occurs most often in:

• Middle-aged or older adults
• Women more frequently than men

Disease may be:

• Unilateral
• Bilateral
• Solitary
• Multifocal

Why the Nodules Form

The precise mechanism is incompletely understood.

Current evidence favors:

Chronic epithelial injury and ocular-surface inflammation → abnormal wound healing → subepithelial fibrosis and collagen deposition

rather than a true inherited corneal dystrophy.

Conditions That Predispose to SND

Frequently associated ocular surface disorders include:

• Meibomian gland dysfunction
• Dry eye disease
• Blepharitis
• Chronic keratitis
• Vernal keratoconjunctivitis
• Previous phlyctenular keratitis
• Trachoma
• Interstitial keratitis
• Chronic contact lens wear
• Ocular trauma

SND may also appear after:

• Corneal surgery
• Longstanding ocular surface irritation

Many patients nevertheless have:

No clearly identifiable precipitating disorder.

Relationship With Other Corneal Disease

SND can coexist with:

• Epithelial basement membrane dystrophy
• Dry eye disease
• Meibomian gland dysfunction
• Prior corneal inflammation
• Previous keratorefractive or other corneal surgery

The underlying ocular surface disorder should be treated because ongoing inflammation may promote:

• Symptoms
• Progression
• Recurrence after surgery

Typical Symptoms

Many lesions are:

Asymptomatic

and discovered during routine examination.

Symptomatic patients may report:

• Foreign-body sensation
• Dryness
• Burning
• Tearing
• Redness
• Intermittent discomfort
• Photophobia
• Reduced vision

Pain is less common but may occur with:

• Epithelial breakdown
• Recurrent erosion

Why Vision Becomes Blurred

Vision may decline because the nodules distort the anterior corneal surface.

Consequences include:

• Irregular astigmatism
• Higher-order aberrations
• Reduced contrast
• Variable refraction
• Corneal flattening
• Hyperopic shift

A peripheral lesion can therefore influence central vision even when it does not directly cover the visual axis.

Characteristic Slit-Lamp Appearance

Typical examination shows:

• Smooth elevated corneal nodule
• Gray-white to creamy appearance
• Subepithelial location
• Often multiple lesions

The epithelium over the nodule may be:

• Intact
• Thinned
• Irregular

Usual Corneal Distribution

SND most often affects the:

Midperipheral or peripheral cornea

but lesions may extend centrally.

Central and paracentral nodules are more likely to produce:

• Reduced acuity
• Irregular astigmatism
• Refractive instability

Changes in Bowman Layer

Bowman layer underneath a nodule may be:

• Thinned
• Fragmented
• Disrupted
• Absent

The lesion therefore represents more than simple epithelial elevation.

Microscopic Appearance

Histopathology classically shows:

• Subepithelial hyaline/fibrous collagen
• Disorganized extracellular matrix
• Attenuated epithelium
• Disruption or absence of Bowman layer

Fibroblast-like cells may be present within the lesion.

How the Diagnosis Is Established

Diagnosis is usually:

Clinical

based on slit-lamp appearance.

Additional testing is most useful when:

• Visual acuity is reduced
• Cataract surgery is being planned
• Refractive surgery is being considered
• Corneal irregularity needs quantification

Mapping the Corneal Shape

Corneal topography or tomography is particularly useful when visual symptoms are present.

It may demonstrate:

• Irregular astigmatism
• Localized flattening
• Distortion extending beyond the visible nodule

These changes can explain reduced vision even when the lesion is peripheral.

Anterior Segment OCT

Anterior segment OCT can demonstrate:

• Hyperreflective subepithelial lesion
• Thickness of the nodule
• Relationship to Bowman layer
• Depth of associated stromal haze

It can be useful when planning:

• Superficial keratectomy
• PTK

Conditions That Can Look Similar

Important alternatives include:

• Spheroidal/climatic droplet degeneration
• Corneal keloid
• Corneal amyloidosis
• Band keratopathy
• Subepithelial corneal scar
• Peripheral hypertrophic scarring
• Nodular degeneration after chronic inflammation

The smooth elevated subepithelial configuration and clinical context usually distinguish SND.

When Observation Is Enough

If the patient is:

• Asymptomatic
• Visually unaffected
• Stable

then:

No direct treatment of the nodules is required.

The underlying ocular surface should still be optimized.

Improving the Ocular Surface

Management may include:

• Preservative-free artificial tears
• Lubricating gels or ointments
• Warm compresses
• Lid hygiene
• Meibomian gland treatment
• Treatment of blepharitis
• Modification of contact lens wear

This may significantly improve:

• Foreign-body sensation
• Fluctuating vision

but usually does not make established nodules disappear.

Anti-Inflammatory Surface Therapy

If clinically significant ocular-surface inflammation is present, treatment may include:

• Short course of topical corticosteroid under supervision
• Topical cyclosporine
• Lifitegrast where appropriate

These agents treat the associated inflammatory dry-eye disease rather than directly dissolving the nodule.

Punctal Occlusion

Punctal plugs may help selected patients with:

• Significant aqueous-deficient dry eye

but active lid or surface inflammation should generally be controlled first.

Using Contact Lenses for Optical Rehabilitation

A:

• Rigid gas-permeable lens
• Scleral lens
• Occasionally hybrid lens

can sometimes improve vision by masking:

Irregular corneal astigmatism

when surgery is undesirable or unsuitable.

When Surgery Becomes Appropriate

Surgical treatment is considered when nodules cause:

• Reduced vision
• Significant irregular astigmatism
• Persistent discomfort
• Recurrent epithelial breakdown
• Contact lens intolerance
• Difficulty obtaining reliable keratometry before cataract surgery

Superficial Keratectomy

Superficial keratectomy is usually the principal surgical treatment.

The procedure typically involves:

• Removing epithelium over the lesion
• Peeling or dissecting the nodule from the anterior cornea
• Smoothing the underlying surface

Many nodules separate relatively cleanly from the underlying stroma.

Expected Effects of Nodule Removal

Successful superficial keratectomy can improve:

• Best-corrected visual acuity
• Irregular astigmatism
• Corneal regularity
• Foreign-body sensation

It may also reverse some of the:

Nodule-induced corneal flattening and hyperopic shift.

Phototherapeutic Keratectomy

Excimer laser phototherapeutic keratectomy (PTK) may be useful when:

• Residual anterior stromal haze remains
• Surface irregularity persists after mechanical removal
• Disease is broad or recurrent

PTK can smooth the anterior cornea but may cause:

• Refractive shift
• Haze
• Recurrence

Therefore treatment depth should be conservative.

Mitomycin C

Mitomycin C has sometimes been applied during surgery to reduce:

• Fibroblast proliferation
• Haze
• Recurrence

However:

Its routine use for every Salzmann lesion is not established.

It should be used selectively because of potential corneal toxicity.

When Corneal Transplantation Is Needed

Keratoplasty is:

Rarely required

because disease is usually superficial.

For unusually extensive, deep, or recurrent disease, options may include:

• Anterior lamellar keratoplasty
• Rarely penetrating keratoplasty

Importance Before Cataract Surgery

SND can significantly distort:

• Keratometry
• Corneal topography
• Astigmatism measurements
• IOL power calculations

Therefore visually or topographically significant nodules should usually be addressed:

Before cataract biometry and definitive IOL selection.

Why Cataract Measurements Can Be Misleading

A Salzmann nodule may cause:

• Local flattening
• Central corneal flattening
• Irregular astigmatism
• Hyperopic refractive shift

Removing the lesion can substantially change:

Corneal power measurements.

Using preoperative measurements obtained before treating significant SND can therefore produce an:

IOL calculation error.

Timing Cataract Biometry After Keratectomy

After superficial keratectomy, corneal measurements should be repeated only after:

The epithelium and corneal curvature have stabilized.

This often requires:

• Several weeks
• Sometimes longer for larger or multiple lesions

Serial reproducible topography/keratometry is more important than using a rigid fixed waiting period.

Considerations Before Refractive Surgery

Unrecognized SND can also interfere with:

• LASIK planning
• PRK planning
• Toric correction

The ocular surface and corneal shape should first be stabilized.

Healing After Surgical Removal

After superficial keratectomy, management may include:

• Bandage contact lens
• Topical antibiotic until epithelial closure
• Short topical corticosteroid course
• Preservative-free lubrication

Follow-up is initially close to confirm:

Complete epithelial healing.

Risk of Recurrence

SND can recur after:

• Superficial keratectomy
• PTK
• Other treatment

Recurrence may occur:

Years later

and is more likely if the underlying ocular surface disease remains active.

Preventing Recurrence

Useful strategies include:

• Treating MGD
• Controlling dry eye disease
• Managing chronic blepharitis
• Avoiding unnecessary ocular surface trauma
• Optimizing contact lens use

These measures cannot guarantee prevention but may improve long-term surface stability.

Possible Complications

Potential problems include:

• Irregular astigmatism
• Reduced visual acuity
• Recurrent epithelial erosion
• Persistent epithelial defect
• Infectious keratitis if epithelium breaks down
• Corneal haze
• Recurrence after surgery

Expected Long-Term Outcome

Overall prognosis is:

Excellent

because the condition is:

• Benign
• Usually slowly progressive
• Often stable for many years
• Highly amenable to superficial treatment when symptomatic

Most patients maintain good functional vision.

Ophthalmology Pearls

• Salzmann’s nodular degeneration is an acquired subepithelial corneal degeneration characterized by smooth gray-white, creamy, yellowish, or bluish elevated nodules.
• It occurs most commonly in middle-aged or older women.
• SND is probably related to chronic ocular surface injury, inflammation, and abnormal wound healing, rather than representing a true inherited dystrophy.
• Important associations include MGD, dry eye, blepharitis, previous keratitis, chronic contact lens wear, trauma, and previous corneal surgery.
• Many lesions are asymptomatic and require observation only.
• Visual loss usually results from irregular astigmatism and altered corneal curvature, not merely physical obstruction of the visual axis.
• Significant peripheral nodules can cause central corneal flattening and a hyperopic shift.
• Topography/tomography is valuable when vision is reduced or cataract/refractive surgery is planned.
• Anterior segment OCT can help define the subepithelial lesion and its relationship to Bowman layer.
• Conservative treatment focuses on lubrication and management of underlying ocular surface disease.
• Rigid or scleral lenses can sometimes improve vision by neutralizing irregular astigmatism.
• Superficial keratectomy is the main surgical treatment for symptomatic or visually significant nodules.
• PTK is useful when residual anterior stromal irregularity or haze remains.
• Mitomycin C may be used selectively, but routine use is not mandatory.
• Recurrence can occur even after successful removal, especially if the underlying ocular surface disorder persists.
• A visually significant Salzmann nodule should generally be removed before cataract biometry, because it can substantially distort keratometry and IOL power calculations.
• After keratectomy, wait for stable reproducible corneal measurements before final cataract or refractive surgery planning.

Ophthalmology – Rubella (German Measles)

What Rubella Is

Rubella is an acute contagious viral infection caused by the rubella virus.

Acquired rubella is usually a mild systemic illness characterized by:

• Low-grade fever
• Malaise
• Tender lymphadenopathy
• Fine pink maculopapular rash
• Arthralgia or arthritis, especially in adolescents and adults
• Mild conjunctivitis

Its major medical importance is not the usually mild postnatal infection, but:

Maternal infection during pregnancy → fetal infection → congenital rubella syndrome (CRS)

CRS can cause severe lifelong:

• Ocular disease
• Hearing loss
• Cardiac abnormalities
• Neurologic/developmental impairment

Modern Virologic Classification

Rubella virus is:

• An enveloped
• Positive-sense
• Single-stranded RNA virus

It is currently classified in the:

Matonaviridae family, genus Rubivirus

Older references commonly classified rubella among the togaviruses.

How Infection Spreads

Rubella is transmitted primarily through:

• Respiratory droplets
• Nasopharyngeal secretions
• Close contact with an infected person

A pregnant person with viremia can transmit the virus:

Transplacentally to the fetus

Time From Exposure to Illness

The incubation period is generally:

About 14–21 days

with an average of approximately 17 days.

Period of Contagiousness

People with acquired rubella are generally considered infectious from approximately:

7 days before to 7 days after rash onset

Transmission may occur from individuals with:

• Mild disease
• Subclinical infection

Why Congenitally Infected Infants Matter

Infants with CRS may shed rubella virus from:

• Nasopharynx
• Urine

for prolonged periods, sometimes:

Up to a year or longer

They can therefore transmit infection to:

• Other infants
• Healthcare workers
• Nonimmune pregnant contacts

Appropriate infection-control precautions are important.

The Typical Acquired Illness

Rubella often begins with:

• Mild fever
• Malaise
• Headache
• Lymphadenopathy
• Mild upper respiratory symptoms

Characteristic lymph nodes include:

• Postauricular
• Posterior cervical
• Suboccipital nodes

Rash Characteristics

The classic rash is:

• Fine
• Pink to light red
• Maculopapular

It generally begins on the:

Face

and then spreads to:

• Trunk
• Extremities

It often resolves within approximately:

3 days

which led to the older nickname:

“Three-day measles.”

Joint Symptoms

Arthralgia and arthritis are particularly common in:

• Adolescents
• Adult women

Affected joints may include:

• Fingers
• Wrists
• Knees
• Ankles

Symptoms are usually self-limited.

Ocular Findings in Acquired Rubella

Postnatal rubella may produce:

• Mild conjunctivitis

Severe ocular inflammation is uncommon.

The major ophthalmic consequences of rubella occur with:

Congenital infection.

Why Pregnancy Changes the Risk

Rubella virus can cross the placenta during maternal viremia.

Fetal consequences depend strongly on:

Gestational age at maternal infection

The earlier the infection:

The greater the risk and severity of congenital abnormalities.

Highest-Risk Period of Gestation

Maternal rubella during the:

First trimester

carries the greatest risk of:

• Fetal infection
• Miscarriage
• Stillbirth
• Severe congenital malformations

Infection during the earliest weeks can lead to very high rates of fetal injury.

Risk generally falls as pregnancy advances.

Why Early Fetal Infection Is So Destructive

Rubella interferes with:

• Cell division
• Organogenesis
• Vascular development
• Tissue differentiation

This is why early fetal exposure can affect multiple organ systems simultaneously.

Congenital Rubella Syndrome

CRS is the constellation of abnormalities produced by:

Intrauterine rubella infection

The classic triad consists of:

1. Ocular abnormalities
2. Sensorineural hearing loss
3. Congenital heart disease

Classic Eye Findings in CRS

The major ophthalmic manifestations are:

• Congenital cataract
• Pigmentary retinopathy
• Congenital or developmental glaucoma

Other possible findings include:

• Microphthalmia
• Refractive error
• Strabismus

Rubella Cataract

Congenital cataract is one of the best-known manifestations of CRS.

It may be:

• Unilateral
• Bilateral

Morphology can vary, but cataract may be:

• Nuclear
• Pearly/white
• Total

Why Cataract Develops

Fetal lens fibers can retain rubella virus for a prolonged period.

Disruption of lens development produces:

Congenital lens opacity

and can cause profound visual deprivation early in life.

Visual Consequences of Congenital Cataract

Untreated dense cataract can lead to:

• Deprivation amblyopia
• Strabismus
• Nystagmus
• Permanent visual impairment

Therefore visually significant congenital cataract requires:

Prompt pediatric ophthalmic assessment.

Cataract Surgery Considerations

Management depends on:

• Laterality
• Density
• Visual axis involvement
• Infant age
• Overall systemic condition

Treatment may involve:

• Cataract extraction
• Aphakic correction or IOL depending on age/case
• Aggressive amblyopia therapy

Long-term follow-up is necessary.

Rubella Pigmentary Retinopathy

The classic retinal finding is:

Salt-and-pepper pigmentary retinopathy

characterized by:

• Diffuse mottling of the RPE
• Areas of hyperpigmentation and hypopigmentation

Functional Impact of Pigmentary Retinopathy

Despite its striking appearance:

Rubella pigmentary retinopathy often causes relatively little visual dysfunction by itself.

Vision may instead be limited by:

• Cataract
• Glaucoma
• Amblyopia
• Optic or neurologic disease

Rubella Retinopathy vs Retinitis Pigmentosa

Unlike classic retinitis pigmentosa, congenital rubella pigmentary retinopathy usually does not show the same pattern of:

• Progressive rod-cone degeneration
• Severe night blindness
• Progressive ring scotoma

The appearance can be dramatic without equivalent functional loss.

Rubella-Associated Glaucoma

Glaucoma may occur congenitally or develop later.

Possible mechanisms include:

• Developmental angle abnormalities
• Ocular structural abnormalities

It may coexist with:

• Cataract
• Microphthalmia

Important Cataract–Glaucoma Relationship

An infant with CRS and cataract requires careful assessment for:

Glaucoma

both before and after cataract surgery.

Long-term IOP surveillance remains important.

Other Eye Abnormalities

Additional ocular features may include:

• Microphthalmia
• Strabismus
• Nystagmus
• Refractive error
• Optic nerve abnormalities in selected patients

The Hearing Component

Sensorineural hearing loss is among the most common manifestations of CRS.

It may be:

• Unilateral
• Bilateral
• Present at birth
• Recognized later

All affected infants require formal:

Audiologic evaluation.

Typical Congenital Heart Disease

Classic cardiac abnormalities include:

• Patent ductus arteriosus
• Peripheral pulmonary artery stenosis

Other congenital cardiac lesions can also occur.

Neurologic and Developmental Effects

CRS may be associated with:

• Microcephaly
• Developmental delay
• Intellectual disability
• Meningoencephalitis
• Behavioral or neurodevelopmental abnormalities

Severity varies widely.

Hematologic and Hepatic Findings

Affected neonates may demonstrate:

• Thrombocytopenia
• Purpura
• Hepatosplenomegaly
• Jaundice
• Hepatitis

Blueberry-Muffin Lesions

CRS may produce:

Blueberry-muffin skin lesions

caused by:

• Extramedullary hematopoiesis

These appear as:

• Blue-purple
• Nonblanching papules or nodules

and are not specific to rubella.

Skeletal Manifestations

Infants may show:

• Radiolucent bone lesions
• Metaphyseal abnormalities

These are less prominent in modern clinical descriptions but remain recognized features of CRS.

Growth and Birth Outcomes

Congenital infection may be associated with:

• Intrauterine growth restriction
• Low birth weight
• Prematurity
• Miscarriage
• Stillbirth

Later Medical Problems

Long-term survivors of CRS may have increased risk of:

• Diabetes mellitus
• Thyroid disease
• Progressive hearing impairment
• Other autoimmune/endocrine disorders

Rarely, progressive neurologic disease such as:

Progressive rubella panencephalitis

has been reported.

How Acquired Rubella Is Suspected

History should address:

• Vaccination status
• Known rubella exposure
• Rash
• Fever
• Arthralgia
• Lymphadenopathy
• Pregnancy status

Clinical appearance alone is:

Not sufficiently specific

because several viral exanthems resemble rubella.

Confirming Acute Infection

Laboratory confirmation is important, especially:

• During pregnancy
• During outbreak investigation
• When CRS is suspected

Methods may include:

• Rubella RT-PCR
• Rubella-specific IgM
• Paired or appropriately interpreted IgG testing

Testing strategy depends on:

• Timing of exposure
• Timing of rash
• Vaccination history
• Pregnancy status

A Caution About Rubella IgM

A positive rubella IgM result does not always prove recent infection because:

• False positives occur
• Cross-reactivity may occur
• Recent vaccination can affect interpretation

Therefore suspected infection in pregnancy requires:

Expert laboratory and infectious-disease/obstetric interpretation.

IgG and Immunity

Rubella-specific IgG is used to assess:

Evidence of immunity

particularly during:

• Preconception assessment
• Prenatal screening

Testing for Congenital Infection

In suspected CRS, laboratory confirmation may include:

• Rubella-specific IgM in the infant
• RT-PCR from appropriate specimens
• Persistent rubella IgG beyond the age expected for passive maternal antibody

Testing should be coordinated with:

• Pediatrics
• Infectious disease
• Public health authorities

Prenatal Assessment

If maternal rubella infection is suspected during pregnancy, evaluation may involve:

• Maternal serology/PCR interpretation
• Detailed fetal ultrasonography
• Maternal-fetal medicine consultation

Fetal ultrasound may identify:

• Growth restriction
• Cardiac anomalies
• Other structural abnormalities

but:

A normal ultrasound does not exclude fetal rubella infection.

Important Diagnostic Alternatives

A rubella-like illness can resemble:

• Measles
• Parvovirus B19
• Enterovirus infection
• Roseola
• Scarlet fever
• Drug eruption
• Other viral exanthems

Congenital findings may overlap with:

• Congenital CMV
• Toxoplasmosis
• Syphilis
• Zika-related congenital disease
• Genetic syndromes

Treating Acquired Rubella

There is:

No specific antiviral therapy for uncomplicated rubella.

Treatment is supportive and may include:

• Rest
• Fluids
• Antipyretics/analgesics
• Symptomatic management of arthralgia

Managing Congenital Rubella

There is no treatment that eradicates established CRS.

Management focuses on:

• Detecting complications early
• Treating specific organ abnormalities
• Maximizing development and function

This requires multidisciplinary care.

Ophthalmic Management in CRS

Eye care may include:

• Cataract surgery
• Glaucoma treatment
• Refractive correction
• Amblyopia therapy
• Strabismus management
• Low-vision rehabilitation

Hearing and Developmental Support

Affected children may require:

• Hearing aids
• Cochlear implantation in selected cases
• Speech therapy
• Developmental services
• Educational accommodations

Cardiac Care

Congenital heart disease may require:

• Pediatric cardiology monitoring
• Catheter-based intervention
• Surgery

depending on severity.

Prevention Through Immunization

The most effective prevention is:

Rubella-containing vaccination, usually as the MMR vaccine.

Vaccination prevents:

• Acquired rubella
• Maternal rubella
• Congenital rubella syndrome

Vaccination Before Pregnancy

Individuals of childbearing potential without evidence of immunity should ideally receive:

MMR before pregnancy

according to local immunization recommendations.

Vaccination During Pregnancy

MMR is a:

Live attenuated vaccine

and is not administered during pregnancy.

If a nonimmune patient is identified during pregnancy:

• Vaccination is deferred
• MMR is generally given postpartum

Accidental Vaccination Around Pregnancy

Because MMR is contraindicated during pregnancy, it should be avoided deliberately.

However:

Inadvertent MMR vaccination during pregnancy is not itself considered an indication for pregnancy termination.

Appropriate obstetric counseling is recommended.

Immune Globulin After Exposure

Immune globulin does:

Not reliably prevent fetal infection or congenital rubella syndrome

after maternal exposure.

It is therefore not a substitute for:

• Preconception immunity
• Vaccination

Infection-Control Measures

Patients with suspected acquired rubella should avoid exposing:

• Pregnant individuals
• Nonimmune contacts

Infants with confirmed CRS may require prolonged precautions because of:

Extended viral shedding.

Follow-Up for Affected Children

Children with CRS require long-term monitoring of:

• Vision
• IOP
• Hearing
• Cardiac status
• Growth
• Development
• Endocrine function

Some complications appear:

Months or years after birth.

Expected Course of Acquired Infection

Postnatal rubella is usually:

Mild and self-limited

with complete recovery.

Serious complications are uncommon, though encephalitis and thrombocytopenia can rarely occur.

Expected Course of Congenital Disease

CRS is a:

Chronic multisystem condition

with prognosis determined by the severity of:

• Cardiac disease
• Neurologic injury
• Hearing impairment
• Ocular disease

Many individual manifestations are treatable even though the congenital infection itself cannot be reversed.

Ophthalmology Pearls

• Rubella is usually a mild acquired viral illness, but maternal infection during early pregnancy can cause severe congenital rubella syndrome.
• The highest fetal risk occurs with first-trimester infection, particularly during early organogenesis.
• The classic CRS triad is ocular disease + sensorineural hearing loss + congenital heart disease.
• The major ocular manifestations are congenital cataract, salt-and-pepper pigmentary retinopathy, and glaucoma.
• Rubella pigmentary retinopathy can look striking but often causes less visual dysfunction than its appearance suggests.
• Congenital cataract threatens vision mainly through deprivation amblyopia, so early pediatric ophthalmic assessment is essential.
• Children with CRS require lifelong surveillance for glaucoma, including after cataract surgery.
• Patent ductus arteriosus and peripheral pulmonary artery stenosis are classic cardiac manifestations.
• Sensorineural deafness is one of the most frequent long-term consequences of CRS.
• Congenitally infected infants may shed virus for many months, creating an infection risk for susceptible pregnant contacts.
• Clinical rash alone is insufficient for definitive diagnosis; serology and/or RT-PCR are used when confirmation matters.
• Rubella IgM can be falsely positive, especially important when evaluating pregnancy, so results require careful interpretation.
• There is no specific antiviral treatment for uncomplicated rubella or established CRS.
• Prevention depends primarily on MMR vaccination before pregnancy.
• MMR is a live attenuated vaccine and is contraindicated during pregnancy; nonimmune patients are generally vaccinated postpartum.
• Immune globulin after maternal exposure does not reliably prevent congenital infection.
• The ophthalmologist may be the first clinician to recognize CRS when a child presents with congenital cataract, pigmentary retinopathy, or glaucoma, so associated hearing and cardiac disease should always be considered.

Ophthalmology – Retinitis Pigmentosa

What Retinitis Pigmentosa Represents

Retinitis pigmentosa (RP) refers to a genetically heterogeneous group of inherited retinal dystrophies characterized predominantly by progressive dysfunction and loss of:

• Rod photoreceptors first
• Followed by secondary cone degeneration

For this reason, many specialists also use the term:

Inherited rod-cone dystrophy

The typical sequence is:

Nyctalopia → progressive midperipheral field loss → tunnel vision → eventual central vision impairment

The rate and severity of progression vary widely according to:

• Causative gene
• Specific pathogenic variant
• Mode of inheritance
• Associated systemic disease

How Common It Is

RP is among the most common inherited retinal degenerations.

Estimated prevalence is approximately:

1 in 3,000–5,000 people

although prevalence varies among populations.

Why the Retina Degenerates

In classic RP, the primary abnormality involves:

Rod photoreceptors

Rod loss initially produces:

• Night blindness
• Midperipheral visual field loss

Secondary degeneration then affects:

Cone photoreceptors

causing later:

• Reduced central acuity
• Reduced color vision
• Photophobia
• Loss of reading vision

Pattern of Retinal Involvement

Degeneration classically begins in the:

Midperipheral retina

and gradually spreads:

• Peripherally
• Centrally toward the macula

This explains the characteristic early ring or annular field defect.

Inheritance and Molecular Basis

RP is one of the most genetically diverse ophthalmic disorders.

Inheritance may be:

• Autosomal dominant
• Autosomal recessive
• X-linked
• Mitochondrial in selected syndromes
• Sporadic/de novo

A substantial proportion of apparently isolated cases can now be molecularly diagnosed using modern genetic testing.

Important RP Genes

Many dozens of genes can cause nonsyndromic RP.

Common examples include:

• RHO
• RPGR
• USH2A
• EYS
• PRPF31
• PDE6A
• PDE6B
• CNGB1
• RPE65
• RP1

The relative frequency varies substantially by:

• Population
• Inheritance pattern
• Ancestry

Autosomal Dominant RP

Frequently associated genes include:

• RHO
• PRPF31
• RP1

Autosomal dominant disease often has:

• Later onset
• Slower progression

than severe X-linked forms, although phenotype varies greatly.

Autosomal Recessive RP

Autosomal recessive RP is genetically very heterogeneous.

Important genes include:

• USH2A
• EYS
• PDE6A
• PDE6B
• RPE65

Consanguinity can increase the likelihood of recessive disease.

X-Linked RP

A major cause of X-linked RP is:

RPGR

X-linked RP often causes:

• Early nyctalopia
• Rapid peripheral field loss
• Earlier central visual decline

Affected males tend to have more severe disease.

Female carriers may show:

• Normal fundus
• Patchy pigmentary changes
• Radial autofluorescence pattern
• Occasionally significant visual dysfunction

because of variable X-chromosome inactivation.

Variable Expression

Even relatives carrying the same pathogenic variant may show:

• Different age of onset
• Different rates of progression
• Different degrees of central vision preservation

Thus:

Genotype helps with prognosis but does not perfectly predict phenotype.

Isolated vs Syndromic Disease

RP may occur as:

• Nonsyndromic RP
• Part of a multisystem inherited disorder

Recognizing syndromic disease is important because associated systemic abnormalities may require treatment or surveillance.

Usher Syndrome

The most important syndromic association is:

Usher syndrome

characterized by combinations of:

• RP
• Sensorineural hearing loss
• Vestibular dysfunction in some subtypes

Different subtypes have different:

• Hearing severity
• Vestibular involvement
• Age of retinal symptom onset

Patients with RP should be asked specifically about:

Hearing impairment.

Bardet-Biedl Syndrome

Features may include:

• Rod-cone dystrophy
• Obesity
• Postaxial polydactyly
• Renal disease
• Hypogonadism
• Developmental or learning difficulties

The renal component can be medically significant.

Refsum Disease

A particularly important treatable association is:

Adult Refsum disease

which may cause:

• RP
• Peripheral neuropathy
• Cerebellar ataxia
• Hearing loss
• Anosmia
• Ichthyosis

It results from impaired phytanic acid metabolism.

Unlike most RP:

Dietary treatment and plasmapheresis in selected cases can modify systemic disease, making diagnosis clinically important.

Other Syndromic Associations

RP-like retinal degeneration can occur in:

• Alström syndrome
• Senior-Løken syndrome
• Joubert-spectrum disorders
• Mitochondrial disorders
• Peroxisomal disorders
• Some ciliopathies

Systemic history should therefore be part of the retinal assessment.

Earliest Symptom

The classic first symptom is:

Nyctalopia

or difficulty seeing in dim illumination.

Patients may describe:

• Difficulty entering a dark cinema
• Trouble walking outdoors at night
• Difficulty driving at dusk
• Slow dark adaptation

Progression of Visual Field Loss

Field loss typically begins as:

• Patchy midperipheral scotomas

These gradually enlarge and merge into:

A ring scotoma

Further progression produces:

Tunnel vision

with a residual central island.

Some patients retain a far peripheral temporal island as well.

Central Vision

Central acuity can remain relatively good for:

Many years or decades

because foveal cones may initially be preserved.

Later central loss can result from:

• Cone degeneration
• Cystoid macular edema
• Epiretinal membrane
• Macular atrophy
• Cataract

Photopsias

Patients may experience:

• Flashing lights
• Shimmering
• Sparkling sensations

These photopsias are common in inherited retinal degeneration and do not necessarily indicate retinal tear.

However, a new acute change in flashes/floaters still warrants appropriate retinal evaluation.

Photophobia

Cone dysfunction and altered retinal adaptation may cause:

• Glare
• Photophobia
• Difficulty in bright diffuse light

Tinted lenses may improve comfort but:

Have not been proven to slow retinal degeneration.

Characteristic Fundus Triad

The classic triad consists of:

1. Bone-spicule pigmentation
2. Attenuated retinal arterioles
3. Waxy pallor of the optic disc

This triad is highly characteristic of established RP.

Bone-Spicule Pigmentation

Bone-spicule pigmentation results from:

RPE cell migration into the inner retina

following photoreceptor degeneration.

The pigment often accumulates around:

• Retinal vessels
• Midperipheral retina

Vascular Attenuation

Retinal vessels become progressively:

• Narrow
• Attenuated

reflecting reduced metabolic demand and retinal degeneration.

Waxy Optic Disc Pallor

The optic disc may develop a characteristic:

Waxy yellow-pale appearance

related to:

• Axonal loss
• Gliosis
• Chronic retinal degeneration

Early Disease May Lack Pigment

Some patients with genetically confirmed RP have little or no bone-spicule pigmentation early in the disease.

This has historically been called:

RP sine pigmento

The diagnosis then depends more heavily on:

• Symptoms
• ERG
• OCT
• FAF
• Genetic testing

Sector RP

Sector retinitis pigmentosa is a milder phenotype in which retinal degeneration is limited mainly to:

• One or two quadrants

It is often:

• Inferior retinal

producing corresponding superior field defects.

It may remain relatively stable for long periods in some patients.

Lens Changes

A common anterior segment association is:

Posterior subcapsular cataract

It may develop earlier than typical age-related cataract and contribute substantially to:

• Glare
• Reduced contrast
• Central visual loss

Vitreous Findings

Patients may have:

• Mild vitreous cells
• Vitreous degeneration

Low-grade vitreous cells alone do not imply infectious or inflammatory uveitis.

Macular Complications

Important causes of central vision loss include:

• Cystoid macular edema
• Epiretinal membrane
• Vitreomacular traction
• Macular atrophy

Cystoid Macular Edema

RP-associated CME can occur even in advanced peripheral degeneration.

Patients may notice:

• Blurred central vision
• Reduced reading ability
• Metamorphopsia

OCT is the preferred test.

Establishing the Diagnosis

Diagnosis combines:

• Clinical history
• Dilated examination
• Full-field electroretinography
• Visual field testing
• OCT
• Fundus autofluorescence
• Genetic testing

No single test should be interpreted in isolation.

Full-Field Electroretinography

Full-field ERG is a key physiologic test for generalized rod-cone dysfunction.

Typical RP demonstrates:

• Markedly reduced rod responses
• Later reduced cone responses
• Reduced a-wave and b-wave amplitudes
• Delayed implicit times

Rod dysfunction is usually disproportionately severe early.

Advanced ERG Changes

In late-stage RP:

Full-field ERG may become nonrecordable

even while a small central island of useful visual function remains.

Thus ERG amplitude does not equal central visual acuity.

Optical Coherence Tomography

Macular OCT is essential in modern RP assessment.

It evaluates:

• Outer retinal integrity
• Ellipsoid zone
• External limiting membrane
• Outer nuclear layer
• Macular atrophy
• CME
• Epiretinal membrane

Ellipsoid Zone

The width of the preserved:

Ellipsoid zone (EZ)

is a useful structural marker of remaining photoreceptor integrity.

Serial EZ measurements can help assess:

Disease progression.

Fundus Autofluorescence

FAF commonly demonstrates:

• Peripheral hypoautofluorescence from RPE loss
• Areas of mottled abnormal autofluorescence
• A characteristic hyperautofluorescent parafoveal ring

Hyperautofluorescent Ring

A parafoveal hyperautofluorescent ring often marks the transition between:

• Relatively preserved central retina
• More dysfunctional peripheral retina

The ring may constrict over time as disease progresses.

Visual Field Assessment

Visual fields document functional progression.

Useful approaches include:

• Automated static perimetry
• Kinetic perimetry, especially for extensive peripheral loss

Kinetic testing can be particularly useful in advanced disease because it maps:

• Remaining peripheral islands
• Central residual field

Color Vision

Color vision may remain relatively preserved early.

With advanced cone involvement, patients may develop:

• Generalized dyschromatopsia
• Blue-yellow abnormalities

Dark Adaptation

Dark adaptation testing may show:

• Prolonged rod adaptation
• Markedly impaired scotopic sensitivity

It is useful in specialized inherited retinal disease assessment but is not mandatory for every patient.

Genetic Testing

Modern management increasingly includes:

Molecular genetic testing

usually with:

• Inherited retinal disease multigene panel
• Exome/genome sequencing when necessary

Testing can:

• Confirm diagnosis
• Establish inheritance pattern
• Clarify recurrence risk
• Identify syndromic disease
• Determine eligibility for gene-specific therapies or trials

Genetic Counseling

Genetic counseling is important both:

Before and after testing

because results may have implications for:

• Siblings
• Parents
• Children
• Reproductive planning
• Systemic screening

Important Diagnostic Alternatives

Conditions that can mimic RP include:

• Congenital stationary night blindness
• Leber congenital amaurosis / early-onset severe retinal dystrophy
• Fundus albipunctatus
• Choroideremia
• Gyrate atrophy
• Vitamin A deficiency
• Autoimmune retinopathy
• Cancer-associated retinopathy
• Drug toxicity
• Congenital infections
• Inflammatory retinal disease

RP vs Congenital Stationary Night Blindness

RP

• Progressive
• Often pigmentary retinal degeneration
• Progressive field loss

Congenital Stationary Night Blindness

• Present from childhood
• Nonprogressive or minimally progressive
• Often relatively normal fundus
• Characteristic ERG pattern

Vitamin A Deficiency

Vitamin A deficiency can cause:

• Night blindness
• Abnormal ERG
• Xerophthalmia in severe cases

Unlike genetic RP, it may be:

Reversible with appropriate replacement

after the cause is established.

Medication Toxicity

RP-like pigmentary retinopathy may follow exposure to certain drugs, classically:

• Thioridazine

History of medication exposure can therefore be important.

Autoimmune Retinopathy

Autoimmune or cancer-associated retinopathy can cause:

• Rapid photoreceptor dysfunction
• Photopsias
• Visual field loss
• Initially subtle fundus findings

The typically:

Rapid onset and progression

help distinguish it from most inherited RP.

Overall Management Strategy

There is currently no universal treatment that stops all forms of RP.

Management focuses on:

• Identifying the molecular diagnosis
• Treating reversible complications
• Providing gene-specific therapy when available
• Maximizing remaining vision
• Low-vision rehabilitation
• Genetic and psychosocial support

Important Modern Correction – Vitamin A

Routine high-dose:

Vitamin A palmitate 15,000 IU/day is no longer generally recommended for RP.

Earlier studies suggested a possible modest benefit, but subsequent reassessment has not established sufficient benefit to justify routine high-dose supplementation, particularly given risks such as:

• Hepatotoxicity
• Bone effects
• Teratogenicity

High-dose vitamin A should therefore:

Not be started routinely for nonspecific RP.

Omega-3 and Lutein

Omega-3 fatty acids and lutein have historically been suggested as supplements.

At present:

They are not established disease-modifying therapies for RP.

Patients should not be told that these supplements reliably slow retinal degeneration.

Vitamin E

Older studies raised concern about high-dose vitamin E supplementation in RP.

There is no reason to use high-dose vitamin E specifically as an RP treatment.

General supplementation should follow:

• Nutritional need
• Broader medical guidance

rather than an RP-specific protocol.

Gene Therapy

The major advance in inherited retinal disease is:

Gene-specific therapy

rather than a single treatment for all RP.

RPE65 Gene Therapy

Voretigene neparvovec is an approved gene therapy for patients with:

Biallelic pathogenic RPE65 variants and viable retinal cells

It is delivered by:

• Subretinal injection

and can improve:

• Functional vision
• Light sensitivity
• Navigation under low illumination

Important Gene-Therapy Principle

Voretigene is:

Not a general treatment for all retinitis pigmentosa.

Patients must have:

• Molecularly confirmed biallelic RPE65 disease
• Sufficient viable retina

Emerging Molecular Therapies

Clinical trials are evaluating approaches such as:

• Gene augmentation
• Gene editing
• Antisense oligonucleotides
• Optogenetics
• Neuroprotective strategies

for several inherited retinal dystrophies.

Eligibility depends on:

• Specific gene
• Disease stage
• Residual retinal structure

Stem Cell Approaches

Photoreceptor/RPE cell replacement strategies remain:

Investigational

and are not routine standard treatment for RP.

Patients should be cautious about unregulated commercial “stem-cell” treatments.

Retinal Prostheses

Electronic retinal prostheses have been developed for profound outer retinal degeneration.

However, currently they have:

Very limited routine clinical availability

and older implants such as the Argus II are no longer broadly available as standard therapy.

Treating RP-Associated Macular Edema

First-line treatment commonly involves:

Carbonic anhydrase inhibition

Examples include:

• Topical dorzolamide
• Topical brinzolamide
• Oral acetazolamide

Carbonic Anhydrase Inhibitors

These may:

• Reduce cystic retinal spaces
• Improve central retinal thickness
• Improve acuity in some patients

Response is variable, and:

Rebound edema can occur.

Oral Acetazolamide

Oral acetazolamide can be more effective than topical therapy in some patients but carries systemic adverse effects such as:

• Paresthesias
• Fatigue
• Electrolyte disturbances
• Kidney stones
• Gastrointestinal symptoms

Long-term treatment should be individualized.

Other CME Treatments

Selected refractory cases may be treated with:

• Intravitreal corticosteroids
• Periocular steroids
• Anti-VEGF in selected circumstances

but evidence is less consistent than for carbonic anhydrase inhibitors.

Cataract Management

Visually significant posterior subcapsular cataract can be treated with:

Phacoemulsification and IOL implantation

Potential benefits can be substantial if:

• Foveal photoreceptor structure remains preserved

Cataract Surgery Considerations

Patients with RP may have increased risk of:

• Postoperative CME
• Capsular contraction
• Zonular weakness in some cases
• Posterior capsule opacification

Macular OCT before surgery helps estimate visual potential.

Epiretinal Membrane Surgery

Vitrectomy with membrane peeling may occasionally be considered for:

• Significant traction
• Distortion
• Progressive visual loss

but expected benefit depends on residual photoreceptor function.

Photophobia Management

Helpful measures include:

• Tinted lenses
• Filters
• Hats/visors
• Individualized lighting

There is no convincing evidence that dark glasses:

Slow RP progression

but they can substantially improve comfort.

Low-Vision Rehabilitation

Low-vision services are an essential part of RP care.

Options include:

• Magnifiers
• Electronic magnification
• Smartphone accessibility tools
• Screen readers
• High-contrast displays
• Orientation and mobility training

Mobility Training

Progressive peripheral field loss can impair:

• Navigation
• Driving
• Stair use
• Mobility in dim illumination

Orientation and mobility training can improve:

Safety and independence.

Driving Assessment

Driving ability depends strongly on:

• Visual field
• Central acuity
• Local licensing regulations

Patients with advanced constriction may lose legal driving eligibility despite relatively good central acuity.

Hearing Assessment

Because of the association with:

Usher syndrome

patients with suspected RP should be asked about hearing.

Audiology referral is appropriate when there is:

• Hearing difficulty
• Early-onset RP
• Syndromic suspicion

Systemic Review

Depending on phenotype, ask about:

• Hearing loss
• Obesity
• Polydactyly
• Renal disease
• Neuropathy
• Ataxia
• Developmental delay
• Anosmia
• Cardiac disease

These findings may identify syndromic or treatable disease.

Family Evaluation

Relatives may benefit from:

• Clinical examination
• Genetic counseling
• Targeted molecular testing after a familial variant is identified

Routine examination alone may miss:

• Female X-linked carriers
• Presymptomatic disease

so genetic information can be particularly useful.

Pregnancy and Reproductive Planning

Patients with a molecular diagnosis may receive counseling regarding:

• Recurrence risk
• Carrier testing
• Prenatal diagnosis
• Preimplantation genetic testing

These are personal reproductive choices guided by:

The specific inheritance pattern and family preferences.

Monitoring Over Time

Follow-up is individualized, often approximately:

Every 6–12 months

for stable disease.

Assess:

• Visual acuity
• Symptoms
• Visual fields
• OCT
• FAF
• Cataract
• CME

ERG does not necessarily need to be repeated at every routine visit.

Measuring Progression

Useful longitudinal biomarkers include:

• Visual field area
• Ellipsoid-zone width
• Fundus autofluorescence ring diameter
• Central retinal structure
• Best-corrected visual acuity

These often provide more practical progression information than repeated full-field ERG alone.

Expected Course

RP is generally:

Progressive

but the rate varies dramatically.

Some patients:

• Retain useful central vision into late adulthood

while others develop:

• Severe visual disability much earlier

Prognostic Clues

Prognosis depends on:

• Causative gene
• Mutation type
• Inheritance pattern
• Age of onset
• Rate of field loss
• Ellipsoid-zone preservation

X-linked RP is often among the more severe forms.

Causes of Late Central Vision Loss

Central vision may decline because of:

• Cone degeneration
• Cystoid macular edema
• Macular atrophy
• Epiretinal membrane
• Posterior subcapsular cataract

Some of these are treatable, so new central visual loss should not automatically be attributed to inevitable RP progression.

Possible Complications

Important associated problems include:

• Cystoid macular edema
• Posterior subcapsular cataract
• Epiretinal membrane
• Vitreomacular traction
• Progressive field constriction
• Central macular atrophy
• Severe visual disability

Ophthalmology Pearls

• Retinitis pigmentosa is a genetically heterogeneous inherited rod-cone dystrophy characterized by progressive rod loss followed by secondary cone degeneration.
• The classic clinical sequence is nyctalopia → midperipheral ring scotoma → tunnel vision → eventual central visual loss.
• The classic fundus triad is bone-spicule pigmentation, attenuated retinal arterioles, and waxy optic disc pallor.
• Bone-spicule pigment represents migration of RPE cells into the inner retina following photoreceptor degeneration.
• Early RP can have little or no pigment, historically termed RP sine pigmento.
• Full-field ERG demonstrates generalized rod-cone dysfunction and remains an important diagnostic test.
• OCT and fundus autofluorescence are central modern monitoring tools, especially ellipsoid-zone preservation and the hyperautofluorescent parafoveal ring.
• Modern genetic testing should be strongly considered, because it can establish inheritance, identify syndromic disease, guide counseling, and determine eligibility for gene-specific therapies.
• Always ask about hearing loss, because RP plus sensorineural deafness strongly suggests Usher syndrome.
• Obesity, polydactyly, renal dysfunction, and retinal degeneration suggest Bardet-Biedl syndrome.
• Neuropathy, ataxia, anosmia, and ichthyosis with RP should raise suspicion for Refsum disease, an important potentially treatable systemic disorder.
• Routine high-dose vitamin A palmitate is no longer recommended as standard RP therapy.
• Omega-3 fatty acids and lutein are not established disease-modifying treatments for RP.
• Voretigene neparvovec is a gene-specific treatment for biallelic RPE65-associated inherited retinal dystrophy, not for RP in general.
• RP-associated cystoid macular edema is commonly treated first with topical or oral carbonic anhydrase inhibitors.
• Posterior subcapsular cataract is common and may be surgically treatable, so reduced vision should not automatically be attributed solely to photoreceptor degeneration.
• Dark or tinted glasses may improve photophobia, but they have not been shown convincingly to slow retinal degeneration.
• Low-vision rehabilitation, orientation and mobility training, genetic counseling, and psychosocial support are major components of long-term care.
• New central visual deterioration should prompt evaluation for CME, cataract, epiretinal membrane, or other treatable complications, rather than simply assuming progression of RP.

Ophthalmology – Retinal/Choroidal Coloboma

What This Condition Represents

Retinal/choroidal coloboma (chorioretinal coloboma) is a congenital ocular malformation caused by incomplete closure of the embryonic optic fissure during early gestation.

The defect may involve:

• Retina
• Retinal pigment epithelium (RPE)
• Choroid
• Optic disc
• Ciliary body
• Iris

Its effect on vision depends primarily on:

• Size of the defect
• Foveal involvement
• Optic nerve involvement
• Associated microphthalmia
• Development of retinal detachment
• Amblyopia

Even a large coloboma can coexist with relatively good central vision if the:

Macula and optic nerve are spared.

How the Defect Develops

During approximately the:

5th–7th weeks of gestation

the inferior embryonic optic fissure normally closes.

Failure of complete closure produces a colobomatous defect.

Because the embryonic fissure lies:

Inferonasally

a typical chorioretinal coloboma is found in the inferonasal fundus.

Structures That May Be Involved

Ocular coloboma may affect one or several structures, including:

• Iris
• Ciliary body
• Lens zonules
• Retina
• Choroid
• Optic nerve

A patient with a visible iris coloboma may therefore also have an occult posterior-segment coloboma.

A complete dilated examination is important.

How Common It Is

Ocular coloboma is uncommon.

Overall prevalence is approximately:

1 in 10,000 births

although estimates vary among populations and include different types of ocular coloboma.

It may be:

• Unilateral
• Bilateral
• Isolated
• Syndromic

Genetic Background

Coloboma is genetically heterogeneous.

It may occur:

• Sporadically
• With autosomal dominant inheritance
• With autosomal recessive inheritance
• With X-linked inheritance
• As part of a chromosomal or multisystem disorder

There is therefore:

No single inheritance pattern for all ocular colobomas.

Important Gene Associations

Genes associated with ocular coloboma include:

• CHD7
• PAX2
• PAX6
• SOX2
• OTX2
• RAX
• MAB21L2

among others.

Genetic evaluation becomes particularly important when there is:

• Bilateral disease
• Positive family history
• Developmental delay
• Hearing loss
• Renal disease
• Cardiac abnormality
• Other congenital malformations

CHARGE Syndrome Link

One of the most important syndromic associations is:

CHARGE syndrome

usually related to pathogenic variants in:

CHD7

The acronym refers to:

• Coloboma
• Heart defects
• Atresia of the choanae
• Retardation of growth/development
• Genital abnormalities
• Ear abnormalities

Coloboma is very common in affected children.

PAX2-Related Disease

Pathogenic variants in PAX2 can produce:

PAX2-related disorder, historically called renal-coloboma or papillorenal syndrome.

Associated findings include:

• Optic nerve dysplasia or coloboma
• Renal abnormalities
• Vesicoureteric abnormalities
• Hearing impairment in some patients

The ocular defect is frequently centered on the:

Optic nerve

rather than being a simple peripheral chorioretinal coloboma.

Other Syndromic Settings

Coloboma may also occur with:

• Aicardi syndrome
• Cat-eye syndrome
• Joubert-spectrum disorders
• Craniofacial developmental syndromes
• Chromosomal abnormalities

Systemic evaluation should therefore be guided by the overall phenotype.

What the Fundus Defect Contains

Within a chorioretinal coloboma there is deficiency or absence of:

• Normal RPE
• Choroid
• Normal retinal architecture

The underlying:

White sclera

is often directly visible.

The Intercalary Membrane

A thin dysplastic tissue may bridge the colobomatous excavation.

This is called the:

Intercalary membrane

It is clinically important because it may:

• Contain abnormal retinal tissue
• Develop holes
• Develop schisis-like changes
• Permit passage of subretinal fluid

and contribute to:

Retinal detachment.

Changes at the Coloboma Edge

The border between normal and abnormal retina may show:

• Pigmentary hyperplasia
• RPE irregularity
• Retinal thinning
• Vitreoretinal adhesion
• Small retinal breaks

These junctional abnormalities are important when assessing detachment risk.

Typical Funduscopic Appearance

The classic lesion is:

• Inferonasal
• Pale or white
• Sharply demarcated
• Excavated
• Often extending anteriorly

Severity ranges from:

• Tiny optic-disc-associated defect

to:

• Large coloboma extending from the posterior pole toward the anterior segment

Bridge-Type Configuration

Occasionally two colobomatous areas are separated by a strip of relatively normal retina.

This configuration is sometimes described as:

Bridge coloboma.

Effect on Central Vision

Visual acuity depends most strongly on whether the defect involves:

• Fovea
• Optic nerve
• Papillomacular bundle

If these are spared:

Good central acuity may be maintained despite a large coloboma.

Expected Visual Field Defect

Because the lesion is typically inferior, patients may have a corresponding:

Superior visual field defect

although field loss depends on lesion size and location.

What to Ask the Patient

Important history includes:

• Lifelong reduced vision
• New change in vision
• New peripheral field loss
• Flashes
• Floaters
• Family history of coloboma
• Hearing impairment
• Renal abnormalities
• Cardiac defects
• Growth or developmental problems
• Genitourinary abnormalities

A new field defect or sudden visual decline should raise concern for:

Retinal detachment.

What to Look for in Children

Children should be assessed for:

• Visual acuity
• Cycloplegic refractive error
• Amblyopia
• Strabismus
• Nystagmus
• Microphthalmia
• Iris coloboma
• Other congenital abnormalities

Associated developmental or systemic problems may be more clinically important than the ocular lesion itself.

Additional Ocular Findings

Chorioretinal coloboma may coexist with:

• Iris coloboma
• Optic nerve coloboma
• Microphthalmia
• Microcornea
• Cataract
• Lens abnormalities
• Strabismus
• Nystagmus

Microphthalmia With Orbital Cyst

A severe defect of optic fissure closure can be associated with:

Microphthalmia with cyst

The cyst may communicate with the globe through the embryonic fissure.

Imaging can show:

• Small malformed globe
• Inferior orbital cyst
• Communication with the eye

How the Diagnosis Is Made

Diagnosis is primarily:

Clinical

through complete dilated fundus examination.

Routine laboratory studies are unnecessary for an isolated typical lesion.

Documenting the Lesion

Useful baseline documentation includes:

• Color fundus photography
• Wide-field imaging when available

This can help monitor:

• Coloboma margins
• Retinal breaks
• Subretinal fluid
• Retinal detachment

Role of OCT

Optical coherence tomography is particularly useful for examining:

• The coloboma edge
• Intercalary membrane
• Foveal architecture
• Subretinal fluid
• Schisis-like changes

OCT may clearly show the transition from:

Normal retina → abnormal intercalary membrane

When Ultrasound Helps

B-scan ultrasonography is useful when:

• Media opacity limits examination
• Retinal detachment is suspected
• Microphthalmia with cyst is present

It is not routinely required when the lesion is clearly visible.

When Neuroimaging Is Appropriate

MRI of the brain/orbits may be considered when there is concern for:

• Optic nerve abnormality
• Microphthalmia with cyst
• Midline developmental defects
• CHARGE syndrome
• Other congenital neurologic abnormalities

MRI is generally preferred to CT in children when it can provide the needed information without ionizing radiation.

Broader Systemic Assessment

Depending on the phenotype, evaluate for:

• Hearing loss
• Cardiac defects
• Choanal atresia
• Renal disease
• Genitourinary abnormalities
• Growth delay
• Developmental delay
• Neurologic abnormalities

Genetics, pediatrics, nephrology, cardiology, or ENT referral may be appropriate depending on associated findings.

Conditions That Can Mimic It

Important alternatives include:

• Chorioretinal scar
• Toxoplasmosis scar
• Posterior staphyloma
• Traumatic chorioretinal defect
• Congenital optic nerve anomalies
• Aicardi-related chorioretinal lacunae
• North Carolina macular dystrophy

Distinguishing It From an Acquired Scar

A congenital coloboma is usually:

• Inferonasal
• Smoothly demarcated
• Present from birth
• Associated with other developmental ocular abnormalities

An acquired chorioretinal scar is more likely to be:

• Irregular
• Pigmented
• Related to inflammation, infection, trauma, or laser

Main Vision-Threatening Problem

The most important long-term complication is:

Rhegmatogenous retinal detachment

The risk is substantially higher than in the general population.

Detachment may arise from:

• Breaks within the intercalary membrane
• Breaks at the coloboma edge
• Breaks elsewhere in apparently normal retina

Why Detachment Develops

Mechanisms include:

• Weak intercalary membrane
• Vitreoretinal traction
• Retinal breaks at the margin
• Communication between fluid spaces inside and outside the coloboma

This abnormal anatomy can make repair more difficult than a routine retinal detachment.

Symptoms That Need Urgent Review

Patients should seek immediate assessment for:

• New flashes
• Sudden increase in floaters
• Curtain or shadow
• New peripheral field loss
• Sudden reduction in vision

These may indicate:

Retinal tear or detachment.

Role of Preventive Laser

Prophylactic laser around the coloboma margin has been proposed to reduce retinal detachment risk.

However:

Routine laser for every coloboma is not universally recommended.

Treatment may be considered when:

• High-risk breaks are present
• The anatomy permits a safe barrier
• A retina specialist judges detachment risk to be substantial

Laser may be difficult or unsafe near:

• Optic disc
• Fovea

Repairing a Retinal Detachment

Coloboma-associated RRD usually requires:

Pars plana vitrectomy

often combined with:

• Identification of retinal breaks
• Endolaser
• Fluid-air exchange
• Gas tamponade
• Silicone oil tamponade

Management is individualized according to anatomy.

Why Surgery Can Be Difficult

Repair is challenging because:

• Retinal breaks can lie inside the coloboma
• The intercalary membrane is fragile
• Anatomy is abnormal
• Laser uptake may be poor over bare sclera
• Optic nerve involvement may complicate treatment

When Silicone Oil Is Useful

Silicone oil is often helpful in complex cases because it provides:

Longer-lasting internal tamponade

particularly when:

• Breaks are multiple or difficult to identify
• The coloboma is extensive
• PVR risk is high

Choroidal Neovascularization

A less common complication is:

Choroidal neovascularization (CNV)

usually arising near the edge of the coloboma.

Symptoms may include:

• New central blur
• Metamorphopsia
• Macular hemorrhage

Managing Coloboma-Associated CNV

Treatment is generally:

Intravitreal anti-VEGF therapy

with OCT ± OCTA/FA used to monitor activity.

Correcting Optical Problems

Treat significant:

• Myopia
• Hyperopia
• Astigmatism
• Anisometropia

especially during childhood.

Cycloplegic refraction is important in children at risk of:

Amblyopia.

Protecting Visual Development

Amblyopia management may include:

• Full refractive correction
• Patching
• Atropine penalization in selected cases

Potential for improvement depends on whether reduced vision is caused by:

• Amblyopia

rather than irreversible structural damage involving the fovea or optic nerve.

Vision Rehabilitation

Patients with irreversible impairment may benefit from:

• Low-vision assessment
• Magnification
• Electronic aids
• Educational accommodations
• Orientation and mobility training

Long-Term Surveillance

Follow-up frequency should be individualized according to:

• Size of defect
• Macular involvement
• Fellow-eye findings
• Prior retinal detachment
• Age
• Symptoms
• Associated syndrome

Periodic dilated retinal examination is important because retinal detachment can occur later in life.

Expected Visual Outcome

Visual prognosis varies widely.

Important determinants include:

• Foveal involvement
• Optic nerve involvement
• Microphthalmia
• Retinal detachment
• Amblyopia

The absolute size of the coloboma is less important than:

Which critical visual structures are involved.

Reproductive and Family Considerations

Because some forms are inherited, genetic counseling may be useful for affected individuals planning pregnancy, especially when there is:

• Known genetic diagnosis
• Bilateral coloboma
• Positive family history
• Associated congenital syndrome

Recurrence risk depends on the:

Specific genetic cause, not merely the presence of coloboma.

Possible Long-Term Sequelae

Complications include:

• Rhegmatogenous retinal detachment
• Refractive error
• Amblyopia
• Strabismus
• Nystagmus
• Choroidal neovascularization
• Permanent visual field loss
• Reduced visual acuity

Ophthalmology Pearls

• Chorioretinal coloboma results from incomplete closure of the embryonic optic fissure and therefore classically lies inferonasally.
• It may involve the iris, ciliary body, choroid, retina, and optic nerve in varying combinations.
• The defect lacks normal RPE and choroid, making the white sclera visible.
• The thin abnormal retinal tissue spanning the coloboma is the intercalary membrane.
• Visual acuity depends mainly on foveal and optic nerve involvement, not simply on lesion size.
• A large coloboma may coexist with good central vision if the macula and disc are spared.
• The most important late ocular complication is rhegmatogenous retinal detachment.
• Retinal breaks may occur within the intercalary membrane, at the coloboma margin, or elsewhere in the retina.
• Coloboma-associated retinal detachment is often complex and commonly requires vitrectomy with endolaser and gas or silicone oil tamponade.
• Routine prophylactic laser around every coloboma is not universally recommended.
• OCT is particularly useful for showing the coloboma margin, intercalary membrane, and subretinal fluid.
• Choroidal neovascularization may arise at the lesion edge and is usually treated with anti-VEGF therapy.
• Children require assessment for refractive error, amblyopia, strabismus, microphthalmia, and syndromic disease.
• Important genetic associations include CHD7 in CHARGE syndrome and PAX2-related renal/optic nerve disease.
• Bilateral coloboma or associated developmental abnormalities should increase consideration for genetic and systemic evaluation.
• New flashes, floaters, curtain-like field loss, or sudden visual deterioration should be treated as possible retinal detachment until excluded.

Ophthalmology – Retinal Vasoproliferative Tumor

Basics

Description

A retinal vasoproliferative tumor (VPT) is a benign peripheral retinal mass characterized by a mixture of:

• Reactive glial proliferation
• Abnormal retinal vascular proliferation
• Chronic exudation

Despite its name, VPT is now better regarded as a:

Reactive gliovascular proliferation rather than a true vascular neoplasm.

Typical features include:

• Yellow-pink to yellow-red retinal mass
• Peripheral location
• Relatively inconspicuous feeding vessels
• Intraretinal/subretinal lipid exudation
• Macular edema or epiretinal membrane in more advanced cases

VPT may be:

• Primary/idiopathic
• Secondary to another ocular disorder

Key Clinical Pattern

The classic lesion is:

A solitary yellow-pink inferotemporal peripheral retinal mass with prominent exudation but without the markedly dilated feeder arteriole and draining vein characteristic of retinal hemangioblastoma.

The major threat to vision is usually not the mass itself, but secondary:

• Macular edema
• Lipid exudation
• Epiretinal membrane
• Exudative retinal detachment
• Vitreoretinal traction

Terminology

Older names include:

• Presumed acquired retinal hemangioma
• Angioma-like retinal mass
• Peripheral retinal telangiectasia
• Reactionary retinal glioangiosis

The preferred term remains:

Retinal vasoproliferative tumor

although histopathology supports a predominantly reactive gliotic process.

Epidemiology

VPT is uncommon.

Typical patients are:

• Adults
• Often middle-aged

There is no strong:

• Sex predilection
• Racial predilection

Most primary lesions are:

• Unilateral
• Solitary

Secondary lesions are more likely to be:

• Multiple
• Bilateral
• Associated with chronic retinal disease

Classification

Primary VPT

Also called:

Idiopathic VPT

No underlying ocular disorder is identified.

These are commonly:

• Solitary
• Unilateral
• Inferotemporal

Secondary VPT

Secondary tumors develop in association with chronic retinal inflammation, degeneration, or injury.

Important associations include:

• Retinitis pigmentosa
• Intermediate uveitis
• Toxoplasma chorioretinitis
• Ocular toxocariasis
• Retinochoroidal coloboma
• Chronic retinal detachment
• Prior retinal surgery
• Ocular trauma
• Other chronic inflammatory or degenerative retinopathies

Pathophysiology

Histopathology demonstrates predominantly:

• Reactive glial proliferation
• Telangiectatic retinal vessels
• Fibrosis
• Lipid exudation
• Chronic inflammatory cells

This supports the concept that VPT represents:

Reactive retinal gliosis with secondary vascular proliferation

rather than a primary angiomatous tumor.

Genetics

There is:

No established hereditary mutation responsible for VPT.

Routine genetic testing is not indicated.

If the lesion instead resembles a:

Retinal hemangioblastoma

particularly in a young patient with:

• Multiple lesions
• Bilateral lesions
• Markedly dilated feeder vessels
• Family history

then evaluation for von Hippel-Lindau disease may be appropriate.

Clinical Presentation

Patients may be:

• Asymptomatic
• Mildly symptomatic
• Visually impaired

Common symptoms include:

• Blurred vision
• Floaters
• Metamorphopsia
• Photopsias
• Peripheral field disturbance

Visual symptoms usually reflect:

• Macular edema
• Epiretinal membrane
• Exudation
• Retinal detachment

rather than direct involvement of the peripheral tumor.

Visual Acuity

Many patients retain good visual acuity at diagnosis.

Vision becomes impaired when there is:

• Foveal edema
• Macular lipid
• Epiretinal membrane
• Macular traction
• Retinal detachment
• Vitreous hemorrhage

Fundus Appearance

A VPT typically appears as:

A yellow-white, yellow-pink, or yellow-red elevated retinal mass

with:

• Ill-defined or moderately defined borders
• Surface telangiectasia
• Surrounding exudation

Location

The classic site is:

Inferotemporal peripheral retina

usually between:

• Equator
• Ora serrata

Other quadrants may be involved.

Size

Most lesions are:

• Relatively small
• A few millimeters in diameter

Thickness varies and becomes clinically important when selecting treatment.

Feeding Vessels

Unlike retinal hemangioblastoma, VPT typically has:

• Normal or only mildly dilated feeding vessels
• Little vascular tortuosity

This is an important diagnostic clue.

Associated Retinal Findings

Common findings include:

• Intraretinal lipid exudation
• Subretinal exudation
• Retinal edema
• Macular edema
• Epiretinal membrane
• Preretinal fibrosis
• Exudative retinal detachment

Hemorrhagic Findings

Less commonly:

• Intraretinal hemorrhage
• Subretinal hemorrhage
• Vitreous hemorrhage

may occur.

Vitreoretinal Fibrosis

Fibroglial proliferation may lead to:

• Epiretinal membrane
• Retinal folds
• Macular traction
• Tractional retinal detachment

This is especially important in longstanding lesions.

Anterior Segment Findings

Secondary ocular findings may include:

• Cataract
• Anterior vitreous cells
• Posterior synechiae
• Elevated IOP

These are more likely when VPT occurs with chronic inflammatory disease.

Diagnosis

Diagnosis is generally based on:

• Clinical appearance
• Peripheral retinal examination
• Multimodal imaging

The principal diagnostic challenge is distinguishing VPT from:

• Retinal hemangioblastoma
• Choroidal melanoma
• PEHCR
• Other peripheral retinal/choroidal masses

Wide-Field Fundus Photography

Useful for:

• Documenting tumor size
• Location
• Exudation
• Serial comparison

Wide-field imaging is particularly helpful because lesions are usually:

Far peripheral.

Fluorescein Angiography

FA may show:

• Early filling of intralesional vessels
• Telangiectatic vascular pattern
• Late diffuse leakage

However, the vascular pattern is usually less dramatic than in retinal hemangioblastoma.

FA in Retinal Hemangioblastoma vs VPT

VPT

• Mild or no feeder vessel enlargement
• Diffuse vascular leakage
• Strong exudative component

Retinal Hemangioblastoma

• Prominent dilated feeding arteriole
• Prominent draining vein
• Dense intrinsic capillary network
• Intense late leakage

OCT

Macular OCT is extremely useful for detecting complications including:

• Cystoid macular edema
• Subretinal fluid
• Hard exudates
• Epiretinal membrane
• Vitreomacular traction

OCT often guides whether treatment is necessary.

Peripheral OCT

Wide-field or peripheral OCT, when technically possible, can help characterize:

• Retinal origin of the lesion
• Gliotic component
• Surface fibrosis
• Associated exudation

Ultrasonography

B-scan ultrasonography may demonstrate:

• Elevated peripheral mass
• Medium to high internal reflectivity

It can help distinguish VPT from:

• Choroidal melanoma

but small peripheral lesions can be difficult to image reliably.

Ultrasound Features

VPT generally shows:

• Acoustic solidity
• Moderate/high reflectivity
• No classic choroidal excavation

A low-reflective solid choroidal mass should raise greater concern for:

Melanoma.

Indocyanine Green Angiography

ICGA may show:

• Intralesional vascularity
• Late hyperfluorescence

Its role is supplementary rather than essential.

Systemic Testing

Routine systemic testing is:

Not required for a typical primary VPT.

Investigations should instead target suspected underlying disease in secondary cases.

Secondary VPT Work-Up

Depending on clinical context, investigate for:

• Uveitis
• Retinitis pigmentosa
• Previous infectious retinitis
• Chronic retinal detachment
• Trauma
• Prior retinal surgery

Testing should be:

Directed by the suspected underlying disorder

rather than performed as a universal panel.

VHL Testing

Routine VHL genetic testing is:

Not indicated for typical VPT.

Consider VHL evaluation only if clinical findings suggest:

• Retinal hemangioblastoma rather than VPT
• Multiple vascular tumors
• Bilateral disease
• Strong family/systemic history

Differential Diagnosis

Important differentials include:

• Retinal hemangioblastoma
• Choroidal melanoma
• Peripheral exudative hemorrhagic chorioretinopathy
• Retinal cavernous hemangioma
• Coats disease
• Retinal macroaneurysm
• Choroidal granuloma
• Retinal detachment-associated gliosis

VPT vs Retinal Hemangioblastoma

This is the key differential.

Vasoproliferative Tumor

• Usually yellow-pink
• Inferotemporal
• Minimal feeder vessel enlargement
• Prominent exudation
• Reactive gliovascular lesion
• No routine VHL association

Retinal Hemangioblastoma

• Orange-red vascular mass
• Prominent feeder arteriole
• Prominent draining vein
• Strong FA leakage
• May be multiple/bilateral
• Strong association with VHL

VPT vs Choroidal Melanoma

VPT

• Retinal rather than choroidal origin
• Yellow-pink
• High/medium ultrasound reflectivity
• Exudation prominent
• Usually small peripheral lesion

Melanoma

• Choroidal origin
• Often pigmented
• Lower internal reflectivity
• Possible orange pigment
• Possible acoustic hollowness

Any uncertain peripheral mass warrants:

Ocular oncology assessment.

VPT vs PEHCR

Peripheral exudative hemorrhagic chorioretinopathy (PEHCR) usually occurs in:

• Older adults

and may show:

• Peripheral subretinal/sub-RPE hemorrhage
• Exudation
• Fibrosis

PEHCR is primarily a:

Choroidal/RPE hemorrhagic disorder

rather than a retinal gliovascular mass.

Treatment Principles

Treatment depends on:

• Symptoms
• Tumor size
• Exudation
• Macular involvement
• Retinal detachment
• Secondary traction

Not every VPT requires treatment.

Observation

Observation is appropriate when the lesion is:

• Small
• Asymptomatic
• Stable
• Without vision-threatening exudation
• Without progressive retinal detachment

Serial evaluation should document:

• Tumor size
• Exudation
• Macular OCT

Indications for Treatment

Treatment is generally considered when there is:

• Macular edema
• Foveal-threatening exudation
• Progressive subretinal fluid
• Exudative retinal detachment
• Progressive tumor activity
• Vitreoretinal traction
• Visual loss

Cryotherapy

Cryotherapy is a principal treatment for peripheral VPT.

It is particularly useful because most lesions are located:

• Near the ora
• In the far peripheral retina

The goal is:

• Tumor involution
• Reduction in vascular leakage
• Resolution of exudation

Cryotherapy Technique

Treatment often requires:

• Double freeze-thaw applications

and may require:

• More than one session

depending on lesion size and response.

Cryotherapy Limitations

Cryotherapy causes inflammation and can temporarily worsen:

• Exudation
• Macular edema
• Subretinal fluid

Therefore large or highly exudative lesions require:

Careful staged treatment and monitoring.

Laser Photocoagulation

Laser may be considered for:

• Smaller lesions
• More posterior tumors
• Lesions accessible to laser

It is less useful for:

• Thick lesions
• Very peripheral lesions
• Lesions obscured by exudation

Photodynamic Therapy

Photodynamic therapy (PDT) can be effective for selected:

• Posterior
• Moderately sized
• Exudative lesions

It may be particularly useful when conventional laser or cryotherapy would damage surrounding structures.

Plaque Brachytherapy

Plaque radiotherapy can be considered for:

• Large or thick VPT
• Extensive exudation
• Exudative retinal detachment
• Lesions refractory to cryotherapy/laser

Radioactive plaque treatment can produce:

• Tumor regression
• Reduced exudation
• Retinal reattachment

Anti-VEGF Therapy

Intravitreal anti-VEGF may reduce:

• Macular edema
• Retinal exudation
• Subretinal fluid

Agents include:

• Bevacizumab
• Ranibizumab
• Aflibercept

However:

Anti-VEGF does not reliably eliminate the underlying VPT.

It should generally be regarded as:

Adjunctive therapy rather than definitive monotherapy.

Corticosteroids

Intravitreal or periocular corticosteroid may be useful for:

• Significant macular edema
• Inflammatory secondary VPT
• Exudation accompanying definitive therapy

Potential risks include:

• Cataract
• Elevated IOP
• Infection

Combined Therapy

A commonly useful strategy for highly exudative lesions is:

Definitive tumor ablation + adjunctive anti-VEGF or corticosteroid

to address associated macular edema or subretinal fluid.

Vitrectomy

Pars plana vitrectomy may be indicated for complications such as:

• Nonclearing vitreous hemorrhage
• Epiretinal membrane with visual distortion
• Tractional retinal detachment
• Combined tractional/exudative retinal detachment
• Severe vitreoretinal fibrosis

Epiretinal Membrane

ERM is an important cause of reduced vision in VPT.

When visually significant, management may require:

Vitrectomy with membrane peeling

once the active peripheral lesion has been controlled.

Retinal Detachment

Exudative retinal detachment may resolve after:

• Effective tumor treatment

More complex detachments with traction may require:

• Vitrectomy
• Membrane dissection
• Other retinal surgical techniques

Local Tumor Resection

Surgical excision has occasionally been performed for:

• Large
• Refractory
• Diagnostically uncertain lesions

but is technically challenging and:

Not routine first-line management.

Enucleation

Enucleation is now:

Extremely uncommon

and should be reserved for situations such as:

• Blind painful eye
• Severe uncontrolled secondary glaucoma
• End-stage untreatable disease
• Rare unresolved concern for malignancy

Management of Secondary VPT

When VPT is secondary, also treat the underlying condition.

Examples:

Intermediate Uveitis

• Control ocular inflammation

Retinitis Pigmentosa

• Manage associated CME and retinal complications

Infectious Chorioretinitis

• Treat active infection if present

Chronic Retinal Detachment

• Address detachment where appropriate

Failure to control the underlying disease may promote continued retinal reactivity.

Follow-Up

Follow-up depends on:

• Activity
• Exudation
• Macular involvement
• Treatment modality

Stable asymptomatic lesions may be followed approximately:

Every 6–12 months

Active or recently treated lesions require closer follow-up.

Monitoring

Assess:

• Visual acuity
• Tumor size
• Exudation
• Subretinal fluid
• Macular edema
• Epiretinal membrane
• Retinal detachment

Use serial:

• Wide-field photography
• OCT

as appropriate.

Prognosis

Overall prognosis is generally:

Good when disease is recognized before permanent macular damage occurs.

Many small lesions remain stable.

Causes of Poor Vision

Permanent visual loss may result from:

• Chronic macular edema
• Foveal hard exudates
• Macular fibrosis
• Epiretinal membrane
• Tractional damage
• Longstanding retinal detachment

Primary vs Secondary Prognosis

Primary solitary VPT often has:

• Favorable prognosis

Secondary disease may be more complicated because of:

• Bilaterality
• Multiple tumors
• Underlying retinal degeneration
• Chronic inflammation
• Preexisting visual impairment

Complications

Potential complications include:

• Macular edema
• Hard exudates
• Exudative retinal detachment
• Epiretinal membrane
• Preretinal fibrosis
• Tractional retinal detachment
• Vitreous hemorrhage
• Cataract
• Secondary glaucoma
• Permanent visual loss

Ophthalmology Pearls

• Retinal vasoproliferative tumor is better regarded as a reactive gliovascular proliferation than a true vascular neoplasm.
• The classic lesion is a yellow-pink peripheral retinal mass, usually inferotemporal, with prominent exudation and only mildly abnormal feeding vessels.
• VPT may be primary/idiopathic or secondary to conditions such as retinitis pigmentosa, intermediate uveitis, previous chorioretinitis, chronic retinal detachment, or trauma.
• Secondary VPT is more likely to be multiple or bilateral.
• The principal visual threats are macular edema, lipid exudation, epiretinal membrane, and exudative or tractional retinal detachment.
• The most important differential is retinal hemangioblastoma.
• RHB has a conspicuous dilated feeder arteriole and draining vein, whereas VPT typically has relatively inconspicuous feeder vessels.
• VPT has no established VHL association, and routine VHL genetic testing is unnecessary unless the diagnosis actually suggests retinal hemangioblastoma.
• Wide-field photography documents the peripheral lesion; OCT is especially important for detecting macular edema, subretinal fluid, and epiretinal membrane.
• On FA, VPT demonstrates intrinsic vascular filling with late leakage, but usually without the striking feeder-vessel pattern of RHB.
• Observation is appropriate for small, stable, asymptomatic lesions without vision-threatening exudation.
• Cryotherapy is a principal treatment for symptomatic peripheral VPT because most tumors are located near the equator or ora serrata.
• Laser or PDT can be useful for selected more posterior lesions.
• Plaque brachytherapy is an important option for large, thick, highly exudative, or treatment-resistant tumors.
• Anti-VEGF and corticosteroids may reduce macular edema and exudation, but are generally adjuncts rather than definitive treatment of the tumor.
• Vitrectomy is reserved for complications such as nonclearing vitreous hemorrhage, significant epiretinal membrane, or tractional retinal detachment.
• The long-term visual outcome depends more on the degree of macular damage and vitreoretinal fibrosis than on the size of the peripheral tumor itself.

Ophthalmology – Retinal Vascular Tumors

Basics

Description

“Retinal vascular tumors” is a traditional umbrella term for several uncommon vascular lesions of the retina.

The major entities include:

• Retinal hemangioblastoma (RHB)
• Retinal cavernous hemangioma/cavernous malformation (RCH)
• Retinal arteriovenous malformation (AVM), historically called racemose hemangioma
• Retinal vasoproliferative tumor (VPT)

A useful modern distinction is that these are not all true neoplasms:

• RHB is a vascular tumor and may be associated with von Hippel-Lindau disease
• RCH is primarily a congenital vascular malformation
• Retinal AVM is a congenital arteriovenous malformation
• VPT is better regarded as a reactive gliovascular proliferation, not a true vascular neoplasm

The major clinical concern is that some lesions may indicate:

Serious hereditary or CNS/systemic disease.

Key Clinical Principle

When a retinal vascular lesion is discovered, determine:

1. What type of lesion is present?
2. Is it visually threatening?
3. Is it associated with systemic or hereditary disease?
4. Does the patient require genetic counseling or systemic imaging?

Retinal Hemangioblastoma

Description

Retinal hemangioblastoma (RHB) is a benign retinal vascular tumor composed of:

• Capillary-sized vessels
• Vacuolated stromal cells

Older names include:

• Retinal capillary hemangioma
• Retinal angioma
• Angiomatosis retinae

The preferred modern term is:

Retinal hemangioblastoma.

Association With von Hippel-Lindau Disease

RHB is one of the major manifestations of:

von Hippel-Lindau (VHL) disease

VHL is an:

Autosomal dominant tumor-predisposition syndrome

caused by pathogenic variants in the:

VHL tumor suppressor gene on chromosome 3p25.3

VHL Pathophysiology

Loss of VHL protein leads to failure of degradation of:

Hypoxia-inducible factors (HIFs)

resulting in increased expression of:

• VEGF
• Erythropoietin
• PDGF
• Other hypoxia-related growth signals

This promotes highly vascular tumors.

Systemic Manifestations of VHL

Important associated lesions include:

• CNS hemangioblastomas
• Clear-cell renal cell carcinoma
• Pheochromocytoma/paraganglioma
• Pancreatic cysts
• Pancreatic neuroendocrine tumors
• Endolymphatic sac tumors
• Epididymal cystadenomas
• Broad-ligament cystadenomas

Because some are life-threatening:

Recognition of a retinal hemangioblastoma may lead to diagnosis of VHL before systemic disease becomes symptomatic.

When to Suspect VHL

The likelihood of germline VHL disease is higher with:

• Young age at diagnosis
• Multiple RHBs
• Bilateral RHBs
• Family history of VHL
• Other VHL-associated tumors

A solitary lesion in an older adult is more likely sporadic, but:

Age alone does not completely exclude VHL.

Genetic Evaluation

Patients with RHB, particularly:

• Children
• Young adults
• Bilateral disease
• Multifocal disease
• Positive family history

should be considered for:

• VHL genetic counseling
• Germline VHL testing

When VHL is confirmed, relatives may also require evaluation.

RHB Clinical Appearance

Classic RHB appears as:

A round or oval orange-red retinal vascular mass

with:

• Dilated feeding arteriole
• Dilated draining vein

The lesion may occur:

• In the peripheral retina
• Juxtapapillary to the optic disc

Peripheral RHB

Peripheral lesions are more common.

Typical features include:

• Red-orange nodular lesion
• Prominent feeder arteriole
• Dilated draining vein
• Lipid exudation
• Retinal edema

Juxtapapillary RHB

Juxtapapillary lesions arise:

• On or immediately adjacent to the optic disc

They are particularly difficult to treat because therapy may damage:

• Optic nerve fibers
• Papillomacular bundle

Therefore observation may be preferred when:

• Vision is good
• Exudation is minimal
• Lesion is stable

RHB Complications

Progressive lesions may cause:

• Macular edema
• Hard exudates
• Subretinal fluid
• Exudative retinal detachment
• Epiretinal membrane
• Retinal traction
• Tractional retinal detachment
• Vitreous hemorrhage
• Neovascular glaucoma in very advanced disease

Remote Macular Exudation

A peripheral RHB can cause:

Macular edema and lipid exudation far from the tumor

because of chronic leakage from the abnormal vascular bed.

Thus visual loss can occur despite a peripheral lesion.

RHB Diagnosis

Diagnosis is usually based on:

• Fundus examination
• Wide-field photography
• Fluorescein angiography
• OCT

Fluorescein Angiography in RHB

FA typically shows:

• Early filling of feeder arteriole
• Rapid filling of tumor capillary network
• Prominent draining vein
• Late intense leakage

FA is very useful for:

• Tumor definition
• Identifying small occult lesions
• Treatment planning

OCT in RHB

OCT is most useful when:

• Lesion is juxtapapillary
• Macula is affected

It may demonstrate:

• Intraretinal edema
• Subretinal fluid
• Hard exudates
• Epiretinal membrane
• Traction

RHB Treatment Principles

The goals are to:

• Destroy or involute the tumor
• Stop exudation
• Preserve the macula
• Prevent retinal detachment

Treatment depends on:

• Tumor size
• Location
• Exudation
• Retinal detachment
• Visual potential

Observation of RHB

Observation may be appropriate for:

• Very small lesions
• Stable lesions
• Selected juxtapapillary tumors
• Lesions without threatening exudation

However, documented growth or increasing leakage favors treatment.

Laser Photocoagulation

Laser photocoagulation is first-line for many small peripheral RHBs.

Laser may be applied to:

• Tumor
• Feeding vessels

Multiple sessions may be required.

Small tumors are considerably easier to control than large ones.

Cryotherapy

Cryotherapy is useful for:

• Larger peripheral lesions
• Very anterior tumors
• Lesions with subretinal fluid that prevents adequate laser uptake

It can induce substantial inflammation and exudation, so treatment is usually staged when necessary.

Photodynamic Therapy

Photodynamic therapy (PDT) may be considered particularly for:

• Juxtapapillary RHB
• Posterior lesions difficult to treat with conventional laser

The goal is selective vascular closure while limiting damage to surrounding retina.

Anti-VEGF Therapy in RHB

Intravitreal anti-VEGF may reduce:

• Macular edema
• Exudation
• Subretinal fluid

However:

Anti-VEGF does not reliably eradicate the hemangioblastoma itself.

It is therefore:

Adjunctive rather than definitive treatment.

Systemic HIF-2α Inhibition

In patients with VHL disease, systemic HIF-2α inhibition with belzutifan may cause regression or reduced activity of some retinal hemangioblastomas.

Its role is primarily within multidisciplinary VHL care and:

Does not replace standard local ocular therapy for every isolated retinal lesion.

Advanced RHB

Severe disease may occasionally require:

• Vitrectomy
• Membrane peeling
• Retinal detachment repair
• Plaque radiotherapy
• Other focal radiotherapy in selected refractory cases

Enucleation is now rarely necessary and is reserved for:

• Blind painful end-stage eyes
• Severe untreatable complications

Retinal Cavernous Hemangioma

Description

Retinal cavernous hemangioma, also termed a retinal cavernous malformation, is a congenital vascular lesion consisting of:

Clusters of thin-walled saccular vascular spaces

It usually behaves benignly.

Clinical Appearance

The classic appearance is:

A cluster of dark-red, grape-like vascular saccules

The lesion may occur in:

• Retina
• Optic disc

Flow Characteristics

Blood flow is:

Very slow

within the vascular spaces.

This produces a characteristic:

Plasma–erythrocyte layering

with red cells settling dependently.

Fluorescein Angiography in RCH

FA shows:

• Slow delayed filling
• Progressive filling of saccules
• Superior plasma fluorescence
• Inferior hypofluorescent erythrocyte layering

Most importantly:

There is little or no fluorescein leakage.

This helps distinguish RCH from:

• Retinal hemangioblastoma
• Coats disease
• Other leaking vascular lesions

Exudation in RCH

Unlike RHB:

Exudation is typically absent.

Therefore:

• Hard exudates are uncommon
• Macular edema is uncommon

RCH Complications

Most lesions remain stable.

Occasional complications include:

• Vitreous hemorrhage
• Epiretinal membrane
• Vitreoretinal traction
• Rare retinal vascular occlusion

Systemic Associations of RCH

Most retinal cavernous hemangiomas are:

Sporadic and isolated

Rare familial cases may occur with:

Cerebral cavernous malformation syndromes

associated with genes including:

• KRIT1 / CCM1
• CCM2
• PDCD10 / CCM3

Systemic imaging or genetic evaluation is most appropriate when there is:

• Family history
• Neurologic symptoms
• Multiple vascular malformations
• Other suggestive lesions

Routine brain imaging is not necessarily required for every isolated typical RCH.

Treatment of RCH

Most retinal cavernous hemangiomas require:

Observation only

because they are usually:

• Stable
• Nonleaking
• Asymptomatic

Treatment is directed at complications rather than the vascular lesion itself.

Vitreous Hemorrhage From RCH

If vitreous hemorrhage occurs:

• Observation may be appropriate if clearing
• Vitrectomy may be required if persistent or recurrent

Routine laser ablation is generally unnecessary.

Retinal Arteriovenous Malformation

Description

Retinal arteriovenous malformation (AVM) is the preferred term for what was historically called:

• Racemose hemangioma
• Arteriovenous aneurysm
• Cirsoid aneurysm

It consists of:

Direct congenital communication between retinal arteries and veins without an intervening normal capillary bed.

Pathophysiology

These lesions develop from abnormal embryologic vascular maturation.

They are:

• Congenital
• Usually unilateral
• Generally nonhereditary

Clinical Appearance

Retinal AVMs appear as:

• Markedly dilated arteries
• Markedly dilated veins
• Direct arteriovenous connections
• Tortuous vascular loops

The distinction between artery and vein may become difficult in extensive lesions.

Archer Classification

Retinal AVMs are sometimes classified into three groups.

Group 1

Small AV communication with:

• Relatively preserved artery/vein distinction

Group 2

More extensive direct AV connections with:

• Enlarged tortuous vessels

Group 3

Massive AV malformation with:

• Extensive retinal involvement
• Marked vascular dilatation
• Greater likelihood of intracranial involvement

Fluorescein Angiography in Retinal AVM

FA typically shows:

• Very rapid arterial-to-venous transit
• Filling of dilated abnormal vessels
• Little or no leakage

Areas of adjacent:

• Capillary nonperfusion

may be present.

Wyburn-Mason Syndrome

Retinal AVM may be associated with:

Wyburn-Mason syndrome

also called:

Bonnet-Dechaume-Blanc syndrome

This consists of AV malformations affecting combinations of:

• Retina
• Orbit
• Brain
• Facial structures

CNS Associations

Intracranial AVMs may involve:

• Midbrain
• Optic pathways
• Thalamus
• Other ipsilateral cerebral structures

Possible symptoms include:

• Headache
• Seizures
• Neurologic deficits
• Visual field defects
• Proptosis
• Orbital bruit

Imaging in Retinal AVM

Extensive retinal AVM should prompt:

MRI/MRA of the brain and orbits

to assess for:

• Intracranial AVM
• Orbital involvement
• Visual pathway disease

CTA or catheter angiography may be required in selected neurologic/neurosurgical cases.

Retinal AVM Complications

Possible ocular complications include:

• Retinal vein occlusion
• Retinal artery occlusion
• Vitreous hemorrhage
• Macular edema
• Retinal ischemia
• Neovascular glaucoma

However, many lesions remain stable for life.

Treatment of Retinal AVM

The retinal vascular malformation itself generally requires:

No direct treatment

unless complications arise.

Intervention is directed toward:

• Hemorrhage
• Macular edema
• Neovascularization
• Retinal ischemia

Associated intracranial AVMs require:

• Neurology
• Neurosurgery
• Neurointerventional assessment

Vasoproliferative Tumor

Important Modern Classification

A retinal vasoproliferative tumor (VPT) is traditionally grouped with retinal vascular tumors but is now better understood as:

A reactive gliovascular proliferation

rather than a true vascular neoplasm.

It usually appears as:

• Yellow-pink peripheral retinal mass
• Commonly inferotemporal
• With prominent exudation

It may be:

• Primary
• Secondary to chronic retinal disease

VPT Associations

Secondary VPT can occur with:

• Retinitis pigmentosa
• Uveitis
• Retinal detachment
• Retinal vascular disease
• Prior surgery
• Other chronic retinal pathology

Systemic Evaluation – General Approach

Systemic work-up should be tailored to lesion type.

RHB

Strong consideration for:

• VHL genetic testing
• VHL systemic surveillance

RCH

Systemic evaluation mainly if:

• Family history
• Neurologic symptoms
• Multiple lesions

Retinal AVM

Consider:

• MRI/MRA brain and orbits, especially if extensive

Differential Diagnosis

Important mimics include:

• Retinal arterial macroaneurysm
• Coats disease
• Retinal vasoproliferative tumor
• Retinoblastoma
• Retinal telangiectasia
• Choroidal hemangioma
• Choroidal melanoma
• Choroidal granuloma
• Retinal neovascularization

RHB vs RCH

Retinal Hemangioblastoma

• Orange-red solid lesion
• Feeder arteriole
• Draining vein
• Marked FA leakage
• Exudation common
• VHL association important

Retinal Cavernous Hemangioma

• Grape-like saccules
• Slow blood flow
• Plasma–RBC layering
• Little or no FA leakage
• Exudation usually absent

RHB vs Retinal AVM

RHB

• Discrete vascular mass
• Feeder and draining vessels
• Exudation common
• FA leakage prominent

Retinal AVM

• Direct artery-to-vein communication
• No discrete tumor mass
• Rapid AV transit
• Little leakage
• Consider Wyburn-Mason syndrome

Treatment Summary

Treatment is lesion specific.

RHB

• Observation selected
• Laser for small peripheral lesions
• Cryotherapy for larger/anterior lesions
• PDT selected posterior/juxtapapillary lesions
• Anti-VEGF adjunct for exudation
• Surgery for traction/RD

RCH

• Usually observe
• Treat complications only

Retinal AVM

• Usually observe
• Treat complications
• Evaluate CNS/orbit when indicated

Follow-Up

Follow-up frequency depends on:

• Lesion type
• Exudation
• Growth
• Macular involvement
• Systemic disease

Stable lesions may be followed every:

6–12 months

Active or vision-threatening lesions require:

Closer surveillance.

Long-Term VHL Surveillance

Patients with confirmed VHL disease require lifelong multidisciplinary surveillance because the major threat is not only ocular disease but:

• Renal cell carcinoma
• CNS hemangioblastoma
• Pheochromocytoma
• Other VHL-associated tumors

Follow-up should be coordinated with:

• Genetics
• Oncology
• Neurology/neurosurgery
• Ophthalmology

Prognosis

Retinal Hemangioblastoma

Visual prognosis depends on:

• Tumor size
• Juxtapapillary location
• Macular exudation
• Retinal detachment
• Number of lesions

Early detection and treatment substantially improve outcomes.

Retinal Cavernous Hemangioma

Prognosis is usually:

Excellent

because most remain stable and nonexudative.

Visual loss is uncommon unless:

• Vitreous hemorrhage
• Traction

develops.

Retinal AVM

Isolated lesions often remain:

Stable

but visual prognosis may worsen with:

• Vascular occlusion
• Hemorrhage
• Macular involvement
• Extensive retinal disease

Systemic prognosis depends on whether associated:

Intracranial AVMs

are present.

Complications

Possible complications across this group include:

• Macular edema
• Lipid exudation
• Exudative retinal detachment
• Tractional retinal detachment
• Epiretinal membrane
• Vitreous hemorrhage
• Retinal vascular occlusion
• Neovascular glaucoma
• Permanent visual loss

Systemic complications may be life-threatening in:

• VHL disease
• Wyburn-Mason syndrome

Ophthalmology Pearls

• “Retinal vascular tumors” includes biologically different entities: RHB is a true vascular tumor, while cavernous hemangioma and retinal AVM are primarily congenital vascular malformations.
• A vasoproliferative tumor is better considered a reactive gliovascular proliferation, not a true vascular neoplasm.
• Retinal hemangioblastoma is classically an orange-red lesion with a dilated feeder arteriole and draining vein.
• RHB has a strong association with von Hippel-Lindau disease, especially when lesions are young-onset, bilateral, or multiple.
• VHL results from pathogenic variants in the VHL tumor suppressor gene on chromosome 3p25.3 and can predispose to CNS hemangioblastomas, renal cell carcinoma, pheochromocytoma, and other tumors.
• On FA, RHB shows rapid filling and marked late leakage.
• Laser is generally preferred for small peripheral RHBs, while cryotherapy is useful for larger or more anterior tumors.
• Juxtapapillary RHB requires caution because treatment can injure the optic nerve and papillomacular bundle.
• Anti-VEGF can reduce exudation from RHB but is generally adjunctive rather than curative.
• Retinal cavernous hemangioma has a characteristic grape-like appearance with plasma–erythrocyte layering and little or no fluorescein leakage.
• Most cavernous hemangiomas are stable and require observation only.
• Retinal cavernous lesions have only an occasional association with familial cerebral cavernous malformation syndromes, so systemic evaluation should be individualized.
• Retinal AVM consists of direct artery-to-vein communication without an intervening capillary bed and usually shows rapid AV transit with little leakage.
• Extensive retinal AVM should prompt consideration of Wyburn-Mason syndrome and generally warrants MRI/MRA of the brain and orbits.
• Most retinal AVMs themselves are not treated unless complications arise.
• The two major systemic associations to remember are: RHB → VHL disease; retinal AVM → Wyburn-Mason syndrome.
• Whenever a retinal vascular lesion is discovered, assess not only the eye but also whether it is a marker of a potentially life-threatening systemic condition.

Ophthalmology – Retinal Microaneurysms

Basics

Description

Retinal microaneurysms (MAs) are tiny focal saccular or fusiform dilatations of retinal capillaries.

Clinically they appear as:

• Small red dots
• Usually in the posterior pole
• Often concentrated around the macula

They are an important marker of:

Retinal microvascular disease

and are classically associated with:

• Diabetic retinopathy
• Retinal vein occlusion
• Hypertensive microvascular disease
• Radiation retinopathy

Microaneurysms may:

• Remain stable
• Thrombose
• Disappear
• Leak plasma
• Rupture into a dot hemorrhage

Key Clinical Concept

A retinal microaneurysm is:

A vascular lesion, not simply a small hemorrhage

The distinction is easiest with angiography:

• Microaneurysm → typically hyperfluorescent
• Dot hemorrhage → typically blocks fluorescence

Anatomy

Microaneurysms arise from retinal capillaries, particularly within the:

• Inner nuclear layer
• Deep capillary plexus
• Occasionally more superficial capillary networks

They are often located near:

• Areas of capillary nonperfusion
• Venous abnormalities
• Regions of chronic vascular stress

Epidemiology

The prevalence of retinal microaneurysms depends strongly on the underlying disease.

They are common in:

• Diabetes mellitus
• Hypertension
• Retinal vein occlusion

They may occasionally occur in otherwise healthy older adults, particularly in association with:

• Hypertension
• Other systemic vascular risk factors

Diabetes

Microaneurysms are one of the earliest clinically detectable lesions of:

Diabetic retinopathy

In standard diabetic retinopathy classification:

Microaneurysms only = mild nonproliferative diabetic retinopathy

provided no more advanced lesion is present.

Risk Factors

Major systemic and ocular risk factors include:

• Diabetes mellitus
• Hypertension
• Dyslipidemia
• Chronic kidney disease
• Retinal vein occlusion
• Retinal ischemia
• Radiation exposure to the retina
• Hyperviscosity states

Pathophysiology

Microaneurysms develop because of:

• Pericyte loss
• Endothelial dysfunction
• Capillary basement membrane abnormalities
• Loss of capillary wall support
• Local retinal ischemia
• Chronic inflammatory signaling

This causes focal weakening of the capillary wall and:

Aneurysmal outpouching

Pericytes

Pericytes normally help maintain:

• Capillary wall integrity
• Blood-retinal barrier function
• Microvascular autoregulation

Their loss, particularly in diabetic retinopathy, promotes:

• Microaneurysm formation
• Leakage
• Capillary instability

Blood-Retinal Barrier Breakdown

Microaneurysms may become incompetent and leak:

• Fluid
• Lipoprotein
• Plasma proteins

This contributes to:

• Retinal edema
• Hard exudates
• Diabetic macular edema

Microaneurysm Rupture

A microaneurysm can rupture and produce:

Dot or blot retinal hemorrhage

Thus microaneurysms and dot hemorrhages may coexist and can be difficult to distinguish ophthalmoscopically.

Microaneurysm Turnover

Microaneurysms are dynamic lesions.

Over time:

• New microaneurysms may appear
• Existing ones may disappear through thrombosis or remodeling

A high rate of microaneurysm formation and disappearance may reflect:

Active retinal microvascular disease

particularly in diabetes.

Clinical Presentation

Microaneurysms themselves are usually:

Asymptomatic

Visual symptoms occur when the underlying vascular disease causes:

• Macular edema
• Retinal ischemia
• Hemorrhage
• Exudation
• Neovascular complications

Visual Symptoms

Patients may experience:

• Blurred central vision
• Metamorphopsia
• Reduced contrast
• Reduced reading vision

when associated with:

Macular edema

Funduscopic Appearance

Microaneurysms appear as:

• Tiny
• Round
• Red
• Sharply defined dots

They are usually:

Smaller than most dot-blot hemorrhages

but size overlap makes clinical distinction imperfect.

Distribution in Diabetic Retinopathy

In diabetes, microaneurysms commonly occur:

• In the posterior pole
• Temporal to the fovea
• Near areas of capillary closure

They may be accompanied by:

• Dot-blot hemorrhages
• Hard exudates
• Cotton-wool spots
• Venous beading
• IRMA
• Macular edema

Distribution in Retinal Vein Occlusion

In retinal vein occlusion, microaneurysms may appear:

• Within the involved venous drainage territory
• Near areas of chronic edema
• After acute hemorrhages have largely resolved

They may persist as a marker of:

Chronic post-occlusive microvascular remodeling

Peripheral Microaneurysms

Peripheral retinal microaneurysms may occur in:

• Diabetic retinopathy
• Sickle cell retinopathy
• Radiation retinopathy
• Retinal telangiectasia
• Chronic retinal vein occlusion
• Hyperviscosity states

The interpretation depends on:

• Distribution
• Associated ischemia
• Other retinal findings

Diagnosis

Diagnosis is usually made through:

• Dilated fundus examination
• Color fundus photography
• OCT when macular edema is suspected
• Fluorescein angiography when vascular detail is needed

Color Fundus Photography

Microaneurysms appear as:

Tiny red dots

Photography is useful for:

• Documentation
• Screening
• Serial comparison
• Diabetic retinopathy grading

Automated image-analysis systems may also detect microaneurysms in diabetic screening programs.

Red-Free Imaging

Red-free photography enhances contrast of:

• Retinal vessels
• Microaneurysms
• Hemorrhages
• Nerve fiber layer lesions

It is supportive but not essential.

Fluorescein Angiography

FA is particularly useful when distinction from hemorrhage is uncertain.

A microaneurysm typically appears as:

A punctate hyperfluorescent lesion in the early or mid angiographic phases

and may show:

• Late leakage

if incompetent.

Microaneurysm vs Dot Hemorrhage on FA

Microaneurysm

• Hyperfluorescent
• May leak

Dot Hemorrhage

• Hypofluorescent
• Blocks underlying fluorescence

This is one of the classic angiographic distinctions.

OCT

OCT does not primarily diagnose isolated microaneurysms but is essential when assessing:

• Macular edema
• Intraretinal cysts
• Subretinal fluid
• Hard exudates
• Retinal thickness

In modern practice, OCT often determines whether treatment is needed more directly than the number of microaneurysms.

OCT Appearance

Individual microaneurysms may appear as:

• Small round or oval hyperreflective vascular structures
• Sometimes with a hyporeflective lumen

They are often associated with:

• Adjacent intraretinal fluid
• Hyperreflective exudative material

OCT Angiography

OCTA may demonstrate:

• Capillary flow abnormalities
• Microaneurysmal outpouchings
• Capillary dropout
• Foveal avascular zone abnormalities

However:

OCTA does not show leakage

so it does not replace fluorescein angiography when leakage assessment is important.

Systemic Evaluation

When retinal microaneurysms are newly identified without a known cause, evaluate for:

• Diabetes
• Hypertension
• Dyslipidemia
• Other vascular disease

Typical assessment may include:

• Blood pressure
• HbA1c or fasting glucose
• Lipid profile when appropriate

Further testing depends on the clinical pattern.

Differential Diagnosis

Microaneurysm-like lesions may occur with:

• Diabetic retinopathy
• Branch retinal vein occlusion
• Central retinal vein occlusion
• Hypertensive retinopathy
• Radiation retinopathy
• Macular telangiectasia
• Sickle cell retinopathy
• Retinal vasculitis
• Hyperviscosity syndromes
• Coats disease and related telangiectatic disorders

Microaneurysm vs Dot Hemorrhage

Clinically:

Microaneurysm

• Smaller
• More sharply circular
• Vascular origin
• Hyperfluorescent on FA

Dot Hemorrhage

• Often slightly larger
• Represents extravasated blood
• Blocks fluorescence on FA

Fundoscopy alone may not always distinguish them.

Microaneurysm vs IRMA

Intraretinal microvascular abnormalities (IRMA) are remodeled intraretinal vascular channels associated with substantial capillary nonperfusion.

IRMA are:

• Larger
• More irregular
• Often adjacent to ischemic retina

and indicate more advanced diabetic retinopathy than isolated microaneurysms.

Microaneurysm vs Telangiectasia

Telangiectatic retinal vessels are:

• Dilated
• Irregular
• Often elongated or branching

whereas microaneurysms are:

Discrete focal capillary outpouchings

Treatment Principles

There is usually:

No indication to treat an isolated microaneurysm simply because it is present.

Treatment is directed toward:

1. The underlying systemic disease
2. Associated macular edema
3. Associated retinal ischemia or neovascular disease

Systemic Risk-Factor Control

Important measures include:

• Good glycemic control
• Blood pressure control
• Dyslipidemia treatment
• Smoking cessation
• Renal and cardiovascular risk management

These reduce progression of diabetic and hypertensive retinal microvascular disease.

Diabetic Macular Edema

When microaneurysm leakage contributes to:

Center-involving diabetic macular edema with visual impairment

the modern first-line treatment is generally:

Intravitreal anti-VEGF therapy

rather than focal laser to individual microaneurysms.

Anti-VEGF Therapy

Common agents include:

• Aflibercept
• Ranibizumab
• Bevacizumab
• Faricimab

depending on:

• Visual acuity
• OCT anatomy
• Availability
• Cost
• Response

Focal/Grid Laser

Focal/grid laser has a more limited role than historically.

It may still be considered for:

• Non-center-involving diabetic macular edema
• Persistent focal leakage away from the foveal center
• Selected chronic cases

Direct Focal Laser to Microaneurysms

Older treatment algorithms emphasized direct laser photocoagulation of leaking microaneurysms.

Today:

Direct focal treatment is not first-line for center-involving DME

because anti-VEGF therapy generally provides better visual outcomes.

When focal laser is used, treatment near the fovea must be cautious because scars can:

• Enlarge
• Produce paracentral scotoma
• Damage central vision

Retinal Vein Occlusion

If microaneurysms occur with vein-occlusion-related macular edema:

Anti-VEGF therapy is usually first-line

with corticosteroid therapy considered in selected cases.

The microaneurysms themselves are not usually directly treated.

Radiation Retinopathy

For radiation maculopathy with edema:

Anti-VEGF therapy is the principal modern treatment

often requiring repeated injections.

Hypertensive Retinopathy

Management is directed toward:

Systemic blood pressure control

There is no ocular treatment specifically for isolated hypertensive microaneurysms.

Follow-Up

Follow-up depends on the underlying disorder.

Monitor:

• Visual acuity
• Fundus appearance
• Retinopathy severity
• Macular OCT
• Systemic risk-factor control

Diabetic Retinopathy Monitoring

The presence of microaneurysms establishes at least:

Mild nonproliferative diabetic retinopathy

if diabetes is present and no other more advanced features exist.

Follow-up interval then depends on:

• Overall retinopathy stage
• DME
• Pregnancy
• Systemic control
• Fellow-eye status

Prognosis

An isolated retinal microaneurysm may:

• Persist
• Thrombose
• Disappear spontaneously

Its prognosis depends mostly on:

The underlying microvascular disease

rather than on the lesion itself.

Visual Prognosis

Microaneurysms threaten vision primarily when they cause:

• Macular edema
• Hard exudation near the fovea

or occur as part of more advanced ischemic retinopathy.

Complications

Potential consequences include:

• Dot-blot hemorrhage
• Retinal edema
• Hard exudates
• Macular edema
• Visual loss

The broader underlying disease may additionally lead to:

• Retinal ischemia
• Neovascularization
• Vitreous hemorrhage
• Tractional retinal detachment

Ophthalmology Pearls

• Retinal microaneurysms are focal dilatations of retinal capillaries and are among the earliest clinically detectable signs of diabetic retinopathy.
• In a patient with diabetes, microaneurysms only = mild NPDR.
• They arise from capillary wall weakness associated with pericyte loss, endothelial dysfunction, and blood-retinal barrier breakdown.
• Microaneurysms may leak, producing retinal edema and hard exudates, or rupture, producing dot hemorrhages.
• On ophthalmoscopy, microaneurysms and dot hemorrhages can look similar; FA helps distinguish them.
• On fluorescein angiography, a microaneurysm is usually punctate hyperfluorescent, while a hemorrhage blocks fluorescence.
• OCT is the key test when macular edema is suspected, because treatment decisions depend more on macular structure than on microaneurysm count.
• OCTA can show capillary abnormalities but cannot demonstrate leakage.
• Newly identified microaneurysms without an established diagnosis should prompt assessment for diabetes and hypertension.
• Important associated conditions include diabetic retinopathy, retinal vein occlusion, hypertensive retinopathy, radiation retinopathy, and retinal telangiectatic disease.
• Isolated microaneurysms usually require no direct ocular treatment.
• For center-involving diabetic macular edema, intravitreal anti-VEGF therapy is first-line, not focal laser to individual microaneurysms.
• Focal/grid laser now has a more selective role, particularly for non-center-involving edema or persistent focal leakage away from the foveal center.
• The significance and prognosis of retinal microaneurysms depend primarily on the underlying retinal vascular disorder and presence of macular edema or ischemia.

Ophthalmology – Retinal Arterial Macroaneurysm

Basics

Description

A retinal arterial macroaneurysm (RAM) is an acquired focal dilatation of a retinal arteriole, usually involving one of the first few orders of arterial branching.

It may be:

• Saccular
• Fusiform

and most often occurs at:

• Arteriolar bifurcations
• Arteriovenous crossings

The superotemporal retinal artery is a commonly recognized location.

RAM may remain asymptomatic or cause visual loss through:

• Retinal hemorrhage
• Vitreous hemorrhage
• Macular edema
• Lipid exudation
• Submacular hemorrhage
• Less commonly exudative retinal detachment

Key Clinical Pattern

The classic patient is:

An older hypertensive woman with sudden painless monocular visual loss and multilayer retinal hemorrhage centered on a retinal arteriole.

However, some RAMs present instead with slowly progressive vision loss from:

Chronic macular exudation and edema.

Epidemiology

RAM usually occurs in:

• Older adults
• Most commonly patients >60 years
• Women more often than men

Disease is usually:

• Unilateral
• Solitary

but:

• Multiple RAMs may occur
• Bilateral disease is possible

Risk Factors

The strongest systemic association is:

Arterial hypertension

Other associations include:

• Atherosclerotic cardiovascular disease
• Dyslipidemia
• Increasing age
• Retinal vein occlusion
• Other systemic vascular disease

Systemic Evaluation

Every newly diagnosed RAM should prompt:

• Blood pressure measurement
• Review of cardiovascular risk factors

and appropriate management of:

• Hypertension
• Dyslipidemia
• Diabetes if present
• Smoking and other vascular risks

Systemic treatment does not immediately eliminate the RAM but reduces overall vascular morbidity.

Pathophysiology

Age-related and hypertensive changes produce:

• Arteriolar wall sclerosis
• Loss of elastic tissue
• Smooth muscle degeneration
• Focal wall weakness

This predisposes a retinal arteriole to:

Focal aneurysmal dilation

Hemorrhagic RAM

A hemorrhagic RAM may rupture suddenly and produce:

• Subretinal hemorrhage
• Intraretinal hemorrhage
• Preretinal/subhyaloid hemorrhage
• Vitreous hemorrhage

Simultaneous hemorrhage at several retinal levels is highly suggestive of:

Retinal arterial macroaneurysm.

Exudative RAM

Some RAMs leak chronically without major rupture.

This produces:

• Macular edema
• Circinate hard exudates
• Intraretinal lipid
• Subretinal fluid

Vision may decline:

Gradually rather than suddenly.

Quiescent RAM

Some macroaneurysms are discovered incidentally and have:

• No hemorrhage
• No significant exudation
• No macular involvement

These often require:

Observation only.

Clinical Presentation

Patients may be:

• Asymptomatic
• Mildly blurred
• Profoundly visually impaired

The presentation depends on whether the RAM causes:

• Hemorrhage
• Exudation
• Macular involvement

Sudden Visual Loss

Acute painless visual loss typically occurs when the RAM ruptures and causes:

• Premacular hemorrhage
• Submacular hemorrhage
• Vitreous hemorrhage

Gradual Visual Loss

Subacute or chronic blurred vision usually results from:

• Macular edema
• Hard exudates
• Chronic subretinal fluid

Fundus Examination

A RAM appears as:

• Round or fusiform arterial dilatation
• Usually along a major retinal arteriole
• Often near an arterial bifurcation

It may be surrounded by:

• Hemorrhage
• Hard exudates
• Retinal edema

Pulsation

Occasionally the aneurysm may appear:

Pulsatile

on ophthalmoscopy or angiography.

This is not required for diagnosis.

Multilevel Hemorrhage

One of the most useful diagnostic clues is hemorrhage occurring simultaneously:

• Beneath the retina
• Within the retina
• In front of the retina
• Into the vitreous

This reflects rupture from an arterial source through several tissue planes.

Subretinal Hemorrhage

Subretinal hemorrhage may extend toward:

The fovea

and can cause permanent photoreceptor/RPE damage if:

• Thick
• Large
• Persistent

Premacular Hemorrhage

Preretinal or sub-ILM blood may produce:

• Sudden profound central visual loss

while leaving peripheral vision relatively preserved.

Vitreous Hemorrhage

If blood enters the vitreous cavity, patients may experience:

• Sudden floaters
• Haze
• Marked visual reduction

Dense vitreous hemorrhage can temporarily obscure the underlying RAM.

Hard Exudates

Chronic vascular leakage may produce:

• Circinate lipid exudation
• Macular hard exudates

These can remain after the macroaneurysm itself has thrombosed.

Diagnosis

Diagnosis is usually made from:

• Clinical examination
• OCT
• Fluorescein angiography when needed

ICGA can be especially helpful when hemorrhage obscures the lesion.

Optical Coherence Tomography

OCT is central to modern evaluation, particularly when the macula is involved.

It can demonstrate:

• Intraretinal fluid
• Cystoid macular edema
• Subretinal fluid
• Hyperreflective hemorrhage
• Subretinal hyperreflective material
• Structural foveal damage

Serial OCT is useful for monitoring:

Response to treatment and spontaneous resolution.

Fluorescein Angiography

FA may show:

• Early arterial filling of the RAM
• Focal hyperfluorescence
• Late leakage
• Adjacent capillary changes

A thrombosed RAM may show:

• Partial filling
• No filling

Indocyanine Green Angiography

ICG angiography is especially useful when hemorrhage obscures the aneurysm.

Its longer wavelength penetrates:

• Blood
• Pigment

better than fluorescein.

This can help distinguish RAM from:

• Polypoidal choroidal vasculopathy
• Choroidal neovascularization

OCT Angiography

OCTA may demonstrate:

• Flow within the macroaneurysm
• Reduced or absent flow after thrombosis

Its usefulness may be limited by:

• Hemorrhage
• Motion artifact
• Segmentation error

B-Scan Ultrasonography

B-scan is not routinely needed for RAM itself.

It may be useful if there is:

• Dense vitreous hemorrhage

to exclude:

• Retinal detachment
• Intraocular mass

Differential Diagnosis

Important differentials include:

• Polypoidal choroidal vasculopathy
• Neovascular AMD
• Retinal vein occlusion
• Diabetic retinopathy
• Retinal capillary hemangioblastoma
• Retinal vasoproliferative tumor
• Coats-like telangiectasia
• Retinal cavernous hemangioma
• Peripheral exudative hemorrhagic chorioretinopathy
• Choroidal neovascularization

RAM vs Polypoidal Choroidal Vasculopathy

RAM

• Lies on a retinal arteriole
• Arterial origin
• Often shows multilayer hemorrhage
• Visible on retinal vascular examination

PCV

• Choroidal vascular lesion
• Often sub-RPE
• Associated with serosanguineous PED
• Best characterized with ICG/OCT

RAM vs Retinal Vein Occlusion

Retinal vein occlusion typically shows:

• Venous dilation
• Venous tortuosity
• Sectoral or diffuse hemorrhage

RAM instead shows:

• A discrete arterial lesion
• Often focal multilayer hemorrhage

RAM vs Neovascular AMD

Neovascular AMD usually has:

• Drusen or other AMD changes
• Subretinal/intraretinal fluid
• CNV-related hemorrhage

RAM should be suspected when hemorrhage is centered on:

A retinal arteriole.

Treatment Principles

Management depends on:

• Visual acuity
• Macular involvement
• Hemorrhage location
• Degree of exudation
• Spontaneous improvement

Many RAMs undergo:

Spontaneous thrombosis and involution

so observation is appropriate in many cases.

Observation

Observation is appropriate when:

• RAM is asymptomatic
• Hemorrhage is away from the fovea
• Macular edema is mild
• Vision is improving
• Spontaneous thrombosis is occurring

Follow-up should include:

• Visual acuity
• Fundus examination
• OCT

Systemic Management

Control:

• Hypertension
• Dyslipidemia
• Other cardiovascular risk factors

This is an essential component of care.

Anti-VEGF Therapy

Intravitreal anti-VEGF has become an important treatment for symptomatic RAM with:

• Macular edema
• Subretinal fluid
• Significant exudation
• Submacular hemorrhage in selected cases

Agents may include:

• Bevacizumab
• Ranibizumab
• Aflibercept

Anti-VEGF Effects

Anti-VEGF may:

• Reduce macular edema
• Reduce subretinal fluid
• Accelerate hemorrhage absorption in some cases
• Improve visual acuity

However:

Many RAMs resolve spontaneously, so not every patient requires injection.

Laser Photocoagulation

Laser may be considered for:

• Persistent exudative RAM
• Macular-threatening leakage
• Chronic edema not resolving spontaneously

Modern practice uses laser more selectively than older treatment algorithms.

Direct Laser

Direct treatment targets:

The macroaneurysm itself

Potential problems include:

• Arterial occlusion
• Distal retinal ischemia
• Hemorrhage
• Vessel damage

Therefore direct laser is used cautiously.

Indirect Laser

Laser can instead be applied to:

• Surrounding leaking capillary bed
• Adjacent areas of exudation

without directly whitening the arterial aneurysm.

This may reduce leakage with less risk of arterial occlusion.

Laser Limitations

Laser should generally be avoided when:

• Hemorrhage blocks visualization
• Lesion lies very near the fovea
• Spontaneous improvement is already occurring

Premacular Hemorrhage

Large premacular hemorrhage may be managed by:

• Observation
• Nd:YAG hyaloidotomy/membranotomy in carefully selected cases
• Vitrectomy

Choice depends on:

• Hemorrhage location
• Duration
• Thickness
• Relationship to ILM/posterior hyaloid
• Visual needs

Nd:YAG Membranotomy

In a selected large premacular subhyaloid or sub-ILM hemorrhage, Nd:YAG laser may create an opening allowing blood to drain into:

The vitreous cavity

where it can clear more rapidly.

Risks include:

• Macular injury
• Retinal break
• Epiretinal membrane
• Persistent vitreous hemorrhage

It should only be performed in appropriately selected eyes.

Submacular Hemorrhage

Large thick subfoveal hemorrhage is particularly vision-threatening because blood can damage photoreceptors through:

• Mechanical separation
• Iron toxicity
• Fibrin contraction

Early displacement may be considered in selected cases.

Pneumatic Displacement

Treatment may include:

• Intravitreal expansile gas
• Often combined with intravitreal or subretinal tPA
• Frequently combined with anti-VEGF

The goal is to:

Displace blood away from the fovea.

Tissue Plasminogen Activator

tPA helps liquefy clot so that gas can displace it.

Routes include:

• Intravitreal
• Subretinal during vitrectomy

Technique depends on:

• Hemorrhage size
• Thickness
• Duration
• Surgeon preference

Vitrectomy

Pars plana vitrectomy may be considered for:

• Nonclearing vitreous hemorrhage
• Dense premacular hemorrhage
• Large recent submacular hemorrhage
• Associated tractional complications

Subretinal tPA During Vitrectomy

For large thick recent submacular hemorrhage, surgery may include:

• PPV
• Subretinal tPA
• Gas tamponade

with the goal of:

Pneumatically displacing blood from beneath the fovea.

This is generally reserved for selected severe cases.

Retinal Detachment

Retinal detachment is uncommon but can occur secondary to:

• Extensive exudation
• Surgical complications
• Other coincident retinal disease

Treatment follows the underlying mechanism.

Follow-Up

Follow-up frequency depends on:

• Macular involvement
• Hemorrhage size
• Edema
• Treatment

Active symptomatic lesions may require review every:

Several weeks initially

with OCT.

Signs of Involution

A macroaneurysm may:

• Thrombose
• Shrink
• Become fibrotic
• Leave arterial kinking
• Leave surrounding lipid or scar

Prognosis

Overall prognosis is often:

Good

because many RAMs thrombose and involute spontaneously.

Visual outcome depends primarily on:

• Foveal hemorrhage
• Macular edema
• Duration of submacular blood
• Chronic lipid exudation
• Macular scar formation

Good Prognostic Features

Better outcomes occur when:

• Macula is spared
• Hemorrhage is limited
• Edema resolves quickly
• RAM thromboses spontaneously

Poor Prognostic Features

Poorer visual outcome is associated with:

• Large subfoveal hemorrhage
• Persistent macular edema
• Dense lipid deposition
• Foveal fibrosis
• Chronic outer retinal damage

Complications

Potential complications include:

• Macular edema
• Submacular hemorrhage
• Premacular hemorrhage
• Vitreous hemorrhage
• Lipid exudation
• Macular scar
• Epiretinal membrane
• Rare retinal detachment
• Permanent central visual loss

Ophthalmology Pearls

• Retinal arterial macroaneurysm is an acquired focal dilatation of a retinal arteriole, usually occurring in older hypertensive women.
• The superotemporal retinal artery is a common site.
• RAM may present as hemorrhagic, exudative, or quiescent disease.
• A particularly helpful clue is multilevel hemorrhage—subretinal, intraretinal, preretinal, and/or vitreous—from a lesion centered on a retinal arteriole.
• Sudden visual loss suggests rupture and hemorrhage, whereas gradual visual decline suggests macular edema or chronic exudation.
• Always check blood pressure and systemic vascular risk factors.
• OCT is the key modern test for macular edema, subretinal fluid, and structural foveal damage.
• FA identifies the arterial lesion and leakage; ICG is particularly useful when blood obscures the macroaneurysm.
• Many RAMs spontaneously thrombose and involute, so observation is appropriate when the macula is not threatened.
• Anti-VEGF therapy is commonly used for symptomatic RAM with macular edema, subretinal fluid, or selected hemorrhagic presentations.
• Laser is now used selectively for persistent exudative leakage, with caution because direct treatment can produce arterial occlusion or distal ischemia.
• Large premacular hemorrhage may occasionally be treated with Nd:YAG membranotomy or vitrectomy in selected cases.
• Large recent submacular hemorrhage may require pneumatic displacement ± tPA or vitrectomy with subretinal tPA.
• The main determinants of final vision are foveal hemorrhage, persistent macular edema, lipid deposition, and macular scarring.
• The retina may recover well after the aneurysm involutes, but prolonged subfoveal blood can cause permanent photoreceptor damage.

Ophthalmology – Retinal Hemorrhages

Basics

Description

Retinal hemorrhages (RH) are collections of blood within, beneath, or in front of the neurosensory retina.

Their appearance depends strongly on the retinal layer involved.

They may be:

• Superficial intraretinal
• Deep intraretinal
• Preretinal/subhyaloid
• Sub–internal limiting membrane (sub-ILM)
• Subretinal
• Occasionally associated with vitreous hemorrhage

Retinal hemorrhage is a:

Clinical sign rather than a diagnosis

and its significance depends on:

• Age
• Distribution
• Number
• Retinal layer
• Laterality
• Associated ocular findings
• Systemic context

Major Clinical Principle

The morphology and distribution of hemorrhage provide important diagnostic clues.

For example:

• Flame-shaped hemorrhages → superficial nerve fiber layer
• Dot-blot hemorrhages → deeper retinal layers
• Boat-shaped/preretinal hemorrhage → blood between posterior hyaloid or ILM and retina
• Subretinal hemorrhage → blood beneath neurosensory retina

Retinal Anatomy and Hemorrhage Shape

The retinal architecture determines the appearance of blood.

Superficial Retina

Blood spreads along retinal nerve fibers, producing:

Flame-shaped or splinter hemorrhages

Deep Retina

Blood is confined by vertically oriented retinal structures, producing:

Dot or blot hemorrhages

Preretinal Space

Blood may form a:

Boat-shaped or horizontally layered hemorrhage

because it settles under gravity.

Flame-Shaped Hemorrhages

Flame hemorrhages occur in the:

Retinal nerve fiber layer

Common associations include:

• Hypertensive retinopathy
• Retinal vein occlusion
• Papilledema
• Anemia
• Leukemia
• Abusive head trauma

Dot-Blot Hemorrhages

Dot-blot hemorrhages arise in deeper retinal layers.

Common associations include:

• Diabetic retinopathy
• Retinal vein occlusion
• Blood dyscrasias
• Severe retinal ischemia

Preretinal / Subhyaloid Hemorrhage

Blood accumulates between the:

• Posterior hyaloid and retina

or beneath the ILM.

It may appear:

• Round
• Dome-shaped
• Boat-shaped

Common causes include:

• Valsalva retinopathy
• Proliferative diabetic retinopathy
• Retinal neovascularization
• Trauma
• Terson syndrome

Sub-ILM Hemorrhage

Sub-ILM hemorrhage lies between:

• Internal limiting membrane
• Retinal nerve fiber layer

It can appear sharply demarcated and may mimic subhyaloid hemorrhage.

Large premacular collections can cause:

Marked central visual loss

Subretinal Hemorrhage

Subretinal blood lies beneath the:

Neurosensory retina

Common causes include:

• Neovascular age-related macular degeneration
• Myopic CNV
• Trauma
• Polypoidal choroidal vasculopathy
• Retinal macroaneurysm
• Severe choroidal vascular disease

White-Centered Retinal Hemorrhages

White-centered hemorrhages are traditionally called:

Roth spots

The white center may represent:

• Fibrin
• Platelet aggregates
• Ischemic retinal tissue
• Leukemic or inflammatory material

They are:

Nonspecific

and can occur with:

• Infective endocarditis
• Leukemia
• Severe anemia
• Sepsis
• Diabetes
• Hypertension
• Other systemic illness

They are not pathognomonic of endocarditis.

Epidemiology

The frequency of retinal hemorrhage depends entirely on the population and underlying disease.

Important contexts include:

• Newborn retinal hemorrhage
• Retinal vascular disease
• Trauma
• Hematologic disease
• Intracranial disease
• Abusive head trauma

Newborn Retinal Hemorrhage

Retinal hemorrhage is relatively common after delivery, especially following:

• Vaginal delivery
• Vacuum-assisted delivery
• Forceps delivery

It is less common after:

• Cesarean delivery

Most neonatal hemorrhages:

Resolve spontaneously over days to weeks

without visual consequence.

Pediatric Importance

In infants and young children, retinal hemorrhage may result from:

• Birth-related injury
• Accidental trauma
• Abusive head trauma
• Coagulopathy
• Leukemia
• Severe systemic illness
• Intracranial disease

The pattern must always be interpreted together with:

• History
• Neurologic findings
• Systemic evaluation
• Neuroimaging

Abusive Head Trauma

Abusive head trauma (AHT) is an important cause of retinal hemorrhage in infants and young children.

Retinal findings that are especially concerning include:

• Numerous hemorrhages
• Bilateral involvement
• Multilayer hemorrhages
• Extension from posterior pole to peripheral retina
• Retinoschisis
• Perimacular retinal folds

However:

No single retinal finding is independently diagnostic of abuse.

The diagnosis requires integration of:

• Ophthalmic findings
• History
• Neuroimaging
• Skeletal findings
• Laboratory evaluation
• Multidisciplinary child-protection assessment

Important Modern Terminology

The preferred term is:

Abusive head trauma

rather than “shaken baby syndrome,” because injury may involve:

• Acceleration-deceleration
• Rotation
• Impact
• Combinations of mechanisms

Mechanisms in AHT

Proposed mechanisms include:

• Vitreoretinal traction from repetitive acceleration-deceleration
• Increased intracranial and venous pressure
• Hypoxic-ischemic injury
• Vascular dysregulation

The exact contribution of each mechanism varies.

Retinoschisis

Traumatic retinoschisis in AHT typically involves:

• Macula
• Perimacular retina

and may contain:

• Sub-ILM blood
• Intraretinal blood

Associated perimacular folds are highly concerning in the appropriate clinical context.

CPR and Retinal Hemorrhage

Cardiopulmonary resuscitation alone generally causes:

• No retinal hemorrhage
• Or only limited posterior hemorrhage

Extensive multilayer hemorrhages extending to the periphery are:

Not typically explained by uncomplicated CPR alone.

Birth-Related Retinal Hemorrhage

Neonatal birth hemorrhages are usually:

• Intraretinal
• Posterior pole predominant
• Self-resolving

Most resolve within:

• Several days to a few weeks

Some deeper hemorrhages can persist longer.

Risk Factors and Causes

Trauma

• Abusive head trauma
• Accidental head trauma
• Direct ocular trauma
• Birth trauma

Retinal Vascular Disease

• Diabetic retinopathy
• Hypertensive retinopathy
• Retinal vein occlusion
• Retinal artery macroaneurysm
• Ocular ischemic syndrome

Hematologic Disease

• Leukemia
• Thrombocytopenia
• Severe anemia
• Coagulopathy
• Disseminated intravascular coagulation
• Hemophilia
• Vitamin K deficiency
• Sickle cell disease

Infection

Possible causes include:

• Infective endocarditis
• Sepsis
• CMV retinitis
• Toxoplasmosis
• Malaria

Intracranial Disease

Retinal hemorrhages may occur with:

• Papilledema
• Terson syndrome
• Intracranial hemorrhage
• Ruptured aneurysm
• Severe intracranial hypertension

Terson Syndrome

Terson syndrome refers to intraocular hemorrhage associated with:

• Subarachnoid hemorrhage
• Intracranial hemorrhage
• Severe acute intracranial pressure elevation

Hemorrhage may be:

• Vitreous
• Preretinal
• Intraretinal

Hypertension

Severe hypertension may produce:

• Flame hemorrhages
• Cotton-wool spots
• Hard exudates
• Optic disc edema in malignant hypertension

In children, significant hypertensive retinopathy should prompt evaluation for:

• Renal disease
• Endocrine disease
• Other secondary hypertension causes

Diabetes

Diabetic retinopathy causes:

• Microaneurysms
• Dot-blot hemorrhages
• Venous changes
• Exudates
• Neovascularization in advanced disease

Diabetic retinal hemorrhage is uncommon in very young children because retinopathy generally requires:

Years of hyperglycemic exposure.

Leukemia

Leukemia may produce:

• Flame hemorrhages
• Dot-blot hemorrhages
• White-centered hemorrhages
• Cotton-wool spots
• Venous tortuosity

Mechanisms include:

• Anemia
• Thrombocytopenia
• Hyperviscosity
• Direct infiltration

Sickle Cell Disease

Sickle retinopathy can produce:

• Peripheral hemorrhage
• Salmon-patch hemorrhage
• Neovascularization
• Vitreous hemorrhage

especially in proliferative disease.

Papilledema

Severe papilledema may produce:

• Peripapillary flame hemorrhages
• Splinter hemorrhages
• Cotton-wool spots

The optic disc edema itself is usually the dominant finding.

Valsalva Retinopathy

A sudden rise in intrathoracic or intra-abdominal pressure can rupture superficial retinal capillaries.

Triggers include:

• Heavy lifting
• Vomiting
• Coughing
• Labor
• Straining

Typical finding:

Premacular preretinal/sub-ILM hemorrhage

with sudden painless central visual loss.

Retinal Vein Occlusion

Central Retinal Vein Occlusion

May show:

• Diffuse retinal hemorrhages
• Venous dilation and tortuosity
• Cotton-wool spots
• Disc edema

Branch Retinal Vein Occlusion

Produces:

• Sectoral hemorrhages
• Corresponding venous congestion

Retinal Macroaneurysm

Retinal arterial macroaneurysm can cause hemorrhage at multiple levels:

• Preretinal
• Intraretinal
• Subretinal

This “multilevel” hemorrhage pattern is especially characteristic.

History

Important questions include:

• Sudden or gradual visual loss?
• Floaters?
• Trauma?
• Recent birth?
• Head injury?
• Unexplained bruising?
• Bleeding tendency?
• Fever or infection?
• Diabetes?
• Hypertension?
• Hematologic disease?
• Anticoagulant use?

In pediatric cases, history should be documented:

Precisely and contemporaneously.

Examination

Perform a complete ocular examination including:

• Visual acuity when age appropriate
• Pupils
• Anterior segment
• IOP when appropriate
• Dilated fundus examination
• Indirect ophthalmoscopy

Describing Retinal Hemorrhages

Document:

• Number
• Size
• Shape
• Retinal layer
• Laterality
• Distribution
• Posterior vs peripheral location
• Macular involvement
• Associated retinoschisis
• Associated retinal folds

Documentation in Suspected AHT

High-quality documentation is especially important.

Whenever feasible obtain:

• Wide-field retinal photography
• Detailed drawings
• Written description

Photography is valuable for:

• Multidisciplinary review
• Monitoring resolution
• Medico-legal documentation

but does not replace a complete examination.

Indirect Ophthalmoscopy

Dilated indirect ophthalmoscopy is essential for assessing:

• Peripheral retinal extent
• Hemorrhage number
• Retinoschisis
• Retinal tears
• Retinal detachment

This is particularly important in suspected AHT because peripheral hemorrhages may be missed on limited posterior examination.

OCT

OCT is useful for:

• Macular hemorrhage
• Sub-ILM hemorrhage
• Retinoschisis
• Retinal layer localization
• Macular structural damage

Handheld OCT may be useful in infants when available.

Fundus Photography

Wide-field imaging can document:

• Extent
• Distribution
• Evolution over time

RetCam-type systems are often used in infants and young children.

B-Scan Ultrasonography

Useful when media opacity prevents retinal visualization due to:

• Dense vitreous hemorrhage
• Cataract
• Severe anterior segment opacity

It can assess for:

• Retinal detachment
• Posterior segment mass
• Vitreous hemorrhage

Laboratory Evaluation

Testing should be:

Directed by the clinical context

rather than automatically ordering every possible test.

Common initial studies when systemic bleeding disorder is possible include:

• CBC with platelet count
• PT/INR
• aPTT

Additional Hematologic Testing

When indicated, consider:

• Fibrinogen
• D-dimer
• von Willebrand testing
• Specific clotting factors
• Platelet function studies

usually in consultation with hematology.

Infectious Evaluation

If infection is suspected, investigations depend on the clinical setting and may include:

• Blood cultures
• Inflammatory markers
• Targeted serologies/PCR

Child Protection Evaluation

When AHT is a concern, evaluation may include:

• Pediatric assessment
• Neuroimaging
• Skeletal survey
• Laboratory testing for bleeding disorders
• Social/child-protection team consultation

The exact investigation follows:

Local child-protection protocols.

Important Modern Correction – Metabolic Testing

Disorders such as:

Glutaric aciduria type 1

have historically been discussed as mimics of AHT.

They should not be reflexively tested in every child with retinal hemorrhage.

Metabolic testing is best guided by:

• Clinical phenotype
• Neurologic findings
• Neuroimaging
• Genetics/metabolic consultation

Differential Diagnosis

Important causes include:

• Abusive head trauma
• Accidental trauma
• Birth-related retinal hemorrhage
• Coagulopathy
• Leukemia
• Severe anemia
• Retinal vein occlusion
• Hypertensive retinopathy
• Diabetic retinopathy
• Papilledema
• Terson syndrome
• Valsalva retinopathy
• Retinal macroaneurysm
• Infective endocarditis
• Retinal vasculitis

Treatment Principles

There is no treatment directed simply at the presence of blood.

Management focuses on:

1. Treating the underlying cause
2. Protecting vision
3. Preventing complications

Observation

Many retinal hemorrhages resolve spontaneously.

Observation is appropriate when:

• Underlying cause is controlled
• Hemorrhage is not vision-threatening
• No retinal detachment or neovascular complication exists

Hematologic Disease

Treat the systemic disorder appropriately.

Management may include:

• Platelet transfusion
• Packed red blood cells
• Fresh frozen plasma
• Vitamin K
• Specific factor replacement

depending on the underlying condition.

Retinal Vascular Disease

Management depends on cause.

Examples:

• Diabetic retinopathy → anti-VEGF/laser according to stage
• Retinal vein occlusion → anti-VEGF for macular edema ± other treatment
• Proliferative disease → PRP
• Retinal macroaneurysm → observation, laser, or anti-VEGF in selected cases

Valsalva Hemorrhage

Most premacular hemorrhages can be:

Observed

because spontaneous clearing is common.

Large dense premacular hemorrhages may occasionally be treated with:

• Nd:YAG membranotomy in selected appropriate cases
• Vitrectomy if nonclearing or complicated

Vitreous Hemorrhage

Pars plana vitrectomy may be indicated for:

• Nonclearing vitreous hemorrhage
• Retinal detachment
• Traction
• Need to visualize/treat underlying retinal disease

Pediatric Vitreous Hemorrhage

The threshold for intervention may be lower in young children because prolonged visual deprivation can cause:

Amblyopia

especially during critical periods of visual development.

Amblyopia Management

If one eye has prolonged visual deprivation:

• Refractive correction
• Occlusion therapy
• Other amblyopia treatment

may be required once the ocular media are sufficiently clear.

Retinoschisis in AHT

Surgery for traumatic macular retinoschisis is:

Rare and individualized

because intervention itself can damage fragile retinal tissue.

Most management focuses on:

• Systemic stabilization
• Documentation
• Observation of ocular findings

unless a specific surgical indication develops.

Follow-Up

Follow-up depends on:

• Cause
• Hemorrhage severity
• Macular involvement
• Vitreous involvement
• Retinal detachment risk
• Age of patient

Neonatal Hemorrhage

Most uncomplicated birth-related hemorrhages require:

• Observation

Follow-up is particularly appropriate when:

• Macula is involved
• Hemorrhage is dense
• Vitreous hemorrhage is present
• Resolution is uncertain

Pediatric AHT

Serial documentation may help assess:

• Hemorrhage resolution
• Retinoschisis
• Optic nerve injury
• Retinal scar formation
• Visual potential

Prognosis

Prognosis depends primarily on:

The underlying disease rather than the hemorrhage itself.

Small intraretinal hemorrhages often resolve without permanent visual loss.

Poor Prognostic Features

Visual prognosis is worse with:

• Dense premacular hemorrhage
• Vitreous hemorrhage
• Macular retinoschisis
• Retinal detachment
• Optic nerve injury
• Severe retinal ischemia
• Associated cortical visual impairment

Abusive Head Trauma Prognosis

Visual impairment after severe AHT may result from:

• Retinal injury
• Optic atrophy
• Retinal folds/scarring
• Amblyopia
• Cortical/cerebral visual impairment

Neurologic injury may be more important than retinal damage in determining final visual function.

Complications

Possible complications include:

• Vitreous hemorrhage
• Retinal detachment
• Retinoschisis
• Macular scar
• Epiretinal membrane
• Optic atrophy
• Amblyopia
• Strabismus
• Permanent visual loss

Ophthalmology Pearls

• Retinal hemorrhage is a sign, not a diagnosis; interpretation depends on morphology, layer, distribution, age, and systemic context.
• Flame hemorrhages arise in the nerve fiber layer, whereas dot-blot hemorrhages arise in deeper retinal layers.
• Preretinal/sub-ILM hemorrhage may appear boat-shaped and can cause severe central visual loss when premacular.
• White-centered hemorrhages (Roth spots) are nonspecific and are not pathognomonic of infective endocarditis.
• In infants and young children, retinal hemorrhage requires careful consideration of birth trauma, accidental trauma, systemic disease, coagulopathy, and abusive head trauma.
• Retinal findings particularly concerning for AHT include numerous bilateral multilayer hemorrhages extending to the retinal periphery, macular retinoschisis, and perimacular folds, but no single ocular finding proves abuse by itself.
• Suspected AHT requires a multidisciplinary child-protection evaluation, not interpretation of retinal findings in isolation.
• Wide-field photography plus detailed written documentation is highly valuable in suspected pediatric trauma.
• CPR alone generally does not explain extensive multilayer peripheral retinal hemorrhages.
• Birth-related retinal hemorrhages usually resolve spontaneously within days to weeks.
• Dense vitreous hemorrhage in a young child can produce deprivation amblyopia, so prolonged nonclearing hemorrhage may justify earlier vitrectomy.
• In older patients, common etiologies include diabetic retinopathy, retinal vein occlusion, hypertension, retinal macroaneurysm, Valsalva retinopathy, and hematologic disease.
• OCT is particularly useful for localizing premacular hemorrhage, sub-ILM blood, retinoschisis, and macular structural injury.
• Treatment is directed at the underlying cause; most uncomplicated intraretinal hemorrhages themselves require observation rather than direct therapy.
• The visual prognosis depends much more on associated macular, optic nerve, retinal ischemic, or cerebral injury than on the mere presence of hemorrhage.

Ophthalmology – Retinal Break

Basics

Description

A retinal break is a full-thickness defect in the neurosensory retina.

Major types include:

• Horseshoe retinal tear
• Operculated retinal hole
• Atrophic round retinal hole
• Retinal dialysis
• Giant retinal tear

Most occur in the:

Peripheral retina

The principal clinical importance is that a break may permit liquefied vitreous to enter the subretinal space, causing:

Rhegmatogenous retinal detachment (RRD)

Key Clinical Concept

A retinal break itself usually does not reduce central visual acuity.

Symptoms generally arise from:

• Acute posterior vitreous detachment
• Vitreous hemorrhage
• Retinal detachment

The major management question is:

Does this retinal break have enough traction and configuration to justify prophylactic treatment?

Pathophysiology

Retinal breaks arise through two main mechanisms:

Vitreoretinal Traction

Seen particularly with:

• Acute posterior vitreous detachment
• Horseshoe tears
• Retinal dialysis
• Giant retinal tears

Retinal Atrophy

Seen particularly with:

• Round atrophic holes
• Lattice degeneration

Posterior Vitreous Detachment

The most important acquired mechanism is:

Acute PVD with persistent focal vitreoretinal adhesion

As the posterior vitreous separates, traction may pull sufficiently hard on the peripheral retina to create:

A horseshoe tear

This is the classic high-risk retinal break.

Horseshoe Tear

A horseshoe or flap tear is caused by:

Persistent vitreous traction on the apex of a retinal flap

Typical features:

• U- or horseshoe-shaped defect
• Vitreous remains attached to the flap
• Apex usually points posteriorly
• Associated acute flashes/floaters common

These tears have a significant risk of progression to RRD if symptomatic and untreated.

Operculated Retinal Hole

An operculated hole occurs when vitreous traction avulses a small piece of retina.

The detached retinal tissue becomes an:

Operculum

floating anterior to the retinal hole.

Because traction may have been released, the risk of RRD is often lower than with an actively tractional horseshoe tear.

Atrophic Round Hole

These result from:

Peripheral retinal thinning rather than acute vitreous traction

They are commonly associated with:

• Lattice degeneration
• Peripheral retinal degeneration

Most isolated asymptomatic atrophic holes have a:

Low risk of causing retinal detachment

Retinal Dialysis

A retinal dialysis is a circumferential retinal break at the:

Ora serrata

It represents separation of the retina from its anterior attachment.

Common associations include:

• Blunt ocular trauma
• Younger patients
• Inferotemporal location in traumatic cases

Dialysis may remain occult for a prolonged period before producing RRD.

Giant Retinal Tear

A giant retinal tear is a circumferential full-thickness break involving:

≥90° of retinal circumference

It is associated with:

• High myopia
• Trauma
• Stickler syndrome
• Marfan syndrome
• Other vitreoretinopathies

It carries a high risk of:

• Extensive RRD
• Proliferative vitreoretinopathy

and usually requires vitreoretinal surgery.

Epidemiology

Peripheral retinal breaks are relatively common in the population.

Many remain:

• Asymptomatic
• Stable
• Never associated with retinal detachment

The risk varies greatly according to:

• Break type
• Symptoms
• Vitreous traction
• Subretinal fluid
• Patient risk factors

Retinal Tears in Acute Symptomatic PVD

An acute symptomatic PVD carries a meaningful risk of associated retinal tear.

Approximately:

8–15%

of patients with acute symptomatic PVD may have a retinal tear identified on initial examination, depending on the population studied.

A small additional proportion develop:

Delayed retinal tears

after an initially negative examination.

Risk Factors

Important risk factors include:

• Acute symptomatic PVD
• High myopia
• Lattice degeneration
• Increasing age
• Cataract surgery
• Aphakia
• Ocular trauma
• Previous retinal tear
• Previous RRD
• Fellow-eye RRD
• Family history of retinal detachment

Genetic / Syndromic Risk Factors

Disorders associated with increased retinal break/RRD risk include:

• Stickler syndrome
• Marfan syndrome
• Wagner syndrome
• Selected collagen disorders
• Certain inherited vitreoretinopathies

Stickler syndrome is especially important because of its very high lifetime RRD risk.

Symptoms

Symptoms usually reflect vitreous traction rather than the retinal break itself.

Typical symptoms include:

• Flashes (photopsias)
• New floaters
• Shower of black spots
• Cobwebs
• Sudden vitreous haze

A retinal detachment may cause:

• Curtain
• Shadow
• Peripheral field loss
• Reduced central vision if macula becomes involved

Photopsias

Flashes are caused by:

Mechanical vitreoretinal traction stimulating the retina

They are often:

• Brief
• Peripheral
• More noticeable in darkness
• Triggered by eye movement

Floaters

New floaters may represent:

• Vitreous condensations
• Weiss ring
• Pigment cells
• Blood

A sudden shower of floaters is particularly concerning for:

• Retinal tear
• Vitreous hemorrhage

Vitreous Hemorrhage

Vitreous hemorrhage in the setting of acute PVD is a major red flag.

Possible mechanisms include:

• Tearing of a retinal vessel across a flap tear
• Retinal break with vascular injury

An acute PVD with vitreous hemorrhage carries a:

Substantially increased likelihood of retinal tear

and requires meticulous retinal examination.

Shafer Sign

Shafer sign, also called:

Tobacco dust

refers to pigmented cells in the anterior vitreous.

It strongly suggests:

A retinal break in the setting of acute PVD

until proven otherwise.

Weiss Ring

A Weiss ring indicates separation of posterior vitreous from the:

Optic disc

It supports the diagnosis of PVD.

However:

A Weiss ring does not prove that all peripheral vitreoretinal attachments have released.

A retinal tear may still be present.

Diagnosis

Diagnosis requires:

Careful dilated examination of the peripheral retina

The key examination is:

Indirect ophthalmoscopy with scleral depression whenever possible

Why Scleral Depression Matters

Many tears occur:

• Near the vitreous base
• In the far periphery
• Anterior to the equator

and may be missed without scleral depression.

A negative posterior pole examination does:

Not exclude a peripheral retinal tear.

Examination

Assess:

• Visual acuity
• Pupils
• Vitreous
• Shafer sign
• Vitreous hemorrhage
• PVD
• Peripheral retina
• Subretinal fluid
• Fellow eye

Retinal Hole Appearance

Atrophic retinal holes are usually:

• Round
• Small
• Flat
• Often within lattice degeneration

They may have:

• Surrounding pigment

suggesting chronicity.

Horseshoe Tear Appearance

A horseshoe tear demonstrates:

• Flap of retina
• Persistent vitreous traction
• Possible bridging vessel

A bridging retinal vessel may predispose to:

Recurrent vitreous hemorrhage

Retinal Dialysis Appearance

Features include:

• Circumferential break at the ora serrata
• Rolled posterior retinal edge
• Possible pigmentation in chronic cases

Carefully ask about:

Remote trauma, even years earlier.

Lattice Degeneration

Lattice degeneration appears as:

• Peripheral retinal thinning
• White vessels
• Pigment
• Crisscrossing white lines
• Associated round holes in some cases

Most lattice degeneration:

Does not require prophylactic treatment.

B-Scan Ultrasonography

B-scan is useful when media opacity prevents adequate retinal visualization, especially with:

• Dense vitreous hemorrhage
• Cataract
• Corneal opacity

It is excellent for detecting:

• Retinal detachment
• PVD
• Vitreous hemorrhage

Important Limitation of B-Scan

B-scan may occasionally suggest a retinal break, but:

It is not sufficiently sensitive to rule out a small peripheral tear.

If dense vitreous hemorrhage obscures the retina, repeat examinations and/or early vitreoretinal intervention may be required depending on risk.

OCT

OCT is useful for:

• Macular hole
• Vitreomacular traction
• Macular involvement of RRD

but:

OCT cannot exclude peripheral retinal tears.

Differential Diagnosis

Important mimics include:

• Chorioretinal scar
• Peripheral retinal degeneration
• Pars plana cyst
• Enclosed oral bay
• Meridional fold
• Vitreoretinal tuft
• White without pressure
• Peripheral cystoid degeneration

White Without Pressure

White without pressure is a peripheral retinal appearance caused by:

• Vitreoretinal interface changes

It may mimic a retinal tear edge but is:

Not itself a full-thickness retinal break.

Treatment Principles

Treatment is directed at:

Preventing progression to rhegmatogenous retinal detachment

Not every retinal break should be treated.

Treatment depends on:

• Symptoms
• Traction
• Break type
• Subretinal fluid
• Fellow-eye history
• Patient risk factors

Symptomatic Horseshoe Tear

An acute symptomatic horseshoe tear should generally receive:

Prompt retinopexy

because untreated symptomatic tractional tears have a significant risk of progressing to RRD.

Laser Retinopexy

Laser photocoagulation is the usual first-line treatment.

Laser burns are applied:

• Around the retinal break
• In multiple contiguous rows
• To create a chorioretinal adhesion

The goal is to prevent fluid from extending through the break into the subretinal space.

Laser Technique Principle

Treatment must completely surround the break.

For very anterior tears:

• Laser should extend sufficiently anteriorly toward the ora serrata

so that the full margins of the break are sealed.

Incomplete treatment is an important cause of failure.

Cryotherapy

Cryotherapy is an alternative when:

• Break is very anterior
• Media opacity limits laser
• Laser delivery is technically difficult

It creates:

Trans-scleral chorioretinal adhesion

around the break.

Laser vs Cryotherapy

Laser is often preferred when feasible because it causes:

• Less inflammation
• More precise treatment

Cryotherapy remains useful for selected peripheral breaks.

Treatment of Operculated Holes

Asymptomatic operculated holes usually:

Do not require treatment

if there is no:

• Persistent traction
• Subretinal fluid
• High-risk clinical context

Symptomatic cases are individualized.

Treatment of Atrophic Holes

Most asymptomatic atrophic round holes are:

Observed

especially if:

• No subretinal fluid
• No progressive retinal detachment
• No particularly high-risk syndrome

Atrophic Holes in Lattice

Atrophic holes within lattice degeneration are commonly:

Observed without prophylactic laser

unless there are additional high-risk circumstances.

Lattice Degeneration

Routine prophylactic treatment of lattice degeneration alone is:

Not recommended for most patients.

Treatment may be considered selectively when risk is unusually high.

High-Risk Situations for Prophylaxis

Prophylactic treatment may be considered in selected eyes with:

• Symptomatic tractional tear
• Subclinical retinal detachment around a break
• Fellow-eye giant retinal tear
• Certain high-risk hereditary vitreoretinopathies
• Selected eyes before procedures when specific retinal pathology is present

The decision should be individualized.

Fellow Eye After RRD

A history of retinal detachment in the fellow eye increases risk.

However:

Prophylactic laser is not automatically indicated for every peripheral lesion in the fellow eye.

The morphology and risk profile matter.

Retinal Dialysis Treatment

A retinal dialysis without significant detachment may be treated with:

• Laser
• Cryotherapy

Once an RRD is present, repair often requires:

• Scleral buckle
• Vitrectomy in selected cases
• Combined approaches

When RRD Is Already Present

Once fluid has progressed to a clinically significant retinal detachment, simple laser around the break is generally insufficient.

Treatment may involve:

• Pneumatic retinopexy
• Scleral buckle
• Pars plana vitrectomy
• Combined surgery

depending on:

• Break number
• Location
• Lens status
• PVR
• Extent of detachment

Subclinical Retinal Detachment

A small amount of localized subretinal fluid around a tear may sometimes be barricaded with laser when:

• It is limited
• Nonprogressive
• Anatomically suitable

Progressive detachment generally requires surgical repair.

Acute Symptomatic PVD With No Tear

If no tear is found initially:

• Educate about warning symptoms
• Arrange follow-up according to risk

A common approach is repeat examination in approximately:

4–6 weeks

with earlier review in high-risk cases.

High-Risk Follow-Up

Closer surveillance is warranted with:

• Vitreous hemorrhage
• Retinal hemorrhage
• Shafer sign
• Lattice degeneration
• High myopia
• Prior RRD
• Fellow-eye retinal tear/RD
• Recent cataract surgery
• Trauma

Delayed Retinal Tears

A small proportion of patients develop:

New or initially occult retinal tears after the first examination

This is why symptom education and appropriate follow-up are essential.

Patient Education

Patients should seek urgent assessment for:

• Sudden increase in floaters
• New flashes
• Shower of black dots
• Curtain or shadow
• New peripheral field defect
• Sudden reduction in vision

These may indicate:

• New retinal tear
• Vitreous hemorrhage
• Retinal detachment

Myopia and Refractive Surgery

Laser refractive surgery changes:

Corneal refractive power

but does not shorten an elongated myopic eye.

Therefore highly myopic patients remain at increased risk for:

• Retinal tears
• RRD

after LASIK, PRK, or similar procedures.

Cataract Surgery

Pseudophakia is associated with an increased long-term risk of:

Rhegmatogenous retinal detachment

especially in:

• Younger patients
• Men
• High myopes
• Eyes with posterior capsular rupture
• Certain peripheral retinal abnormalities

New flashes/floaters after cataract surgery require retinal evaluation.

Trauma

Blunt trauma may cause:

• Retinal dialysis
• Horseshoe tear
• Giant retinal tear

The retinal break or detachment may present:

Weeks to years later

so remote trauma remains relevant.

Prevention

Most PVD-associated retinal tears cannot be prevented.

The most effective strategy is:

Prompt recognition and treatment of high-risk retinal breaks before RRD develops.

Protective eyewear can reduce traumatic retinal injury risk.

Prognosis

A properly treated retinal tear usually has:

Excellent anatomic prognosis

with a high rate of successful retinal detachment prevention.

However, retinopexy does not prevent:

• New retinal tears elsewhere
• Continued PVD evolution
• Every possible RRD

Failure After Retinopexy

Reasons include:

• Incomplete laser around the tear
• Inadequate anterior treatment
• Continued vitreoretinal traction
• Extension of the original tear
• Development of a new tear
• Established subretinal fluid beyond the barricade

Complications of Laser/Cryotherapy

Potential complications include:

• Mild transient inflammation
• Small retinal hemorrhage
• Epiretinal membrane
• Rare choroidal effusion
• Rare inadvertent macular laser injury

Clinically significant complications are uncommon when treatment is properly performed.

Epiretinal Membrane