Ophthalmology – Recurrent Corneal Erosion Syndrome

Basics

Description

Recurrent corneal erosion syndrome (RCES) is characterized by repeated episodes of spontaneous breakdown of corneal epithelium caused by abnormal epithelial adhesion to the underlying basement membrane/Bowman layer.

The classic presentation is:

Sudden severe unilateral eye pain on awakening or with the first eye opening in the morning

associated with:

• Tearing
• Photophobia
• Foreign-body sensation
• Redness
• Blurred vision

RCES may be:

• Traumatic
• Associated with epithelial basement membrane dystrophy (EBMD)
• Less commonly associated with other corneal dystrophies or ocular-surface disorders

Key Clinical Concept

The fundamental abnormality is:

Failure of the corneal epithelium to form stable adhesion complexes with the underlying basement membrane

During sleep:

• Tear production falls
• Eyelid and corneal epithelium become relatively adherent
• Sudden lid opening creates shearing force

resulting in:

Avulsion of poorly adherent epithelium

Epidemiology

The true incidence is unknown because:

• Mild episodes may never reach medical attention
• Symptoms may be misdiagnosed as dry eye or abrasion

RCES typically affects:

• Young to middle-aged adults

It is usually:

• Unilateral after trauma
• More likely bilateral when associated with EBMD

Etiology

The two major causes are:

1. Previous corneal trauma
2. Epithelial basement membrane dystrophy

Traumatic RCES

Previous trauma is one of the most common causes.

Typical injuries include:

• Fingernail scratch
• Paper edge
• Tree branch
• Leaf
• Other organic material

The original injury may have occurred:

Weeks, months, or even years earlier

and the patient may initially forget it.

Traumatic erosions usually recur:

At the same corneal location.

Epithelial Basement Membrane Dystrophy

EBMD, also called:

• Map-dot-fingerprint dystrophy
• Anterior basement membrane dystrophy

is the most common corneal dystrophy associated with RCES.

Characteristic findings include:

• Map-like lines
• Dot-like epithelial microcysts
• Fingerprint lines
• Negative fluorescein staining
• Loose epithelium

EBMD is often:

• Bilateral
• Asymmetric

Other Corneal Dystrophies

RCES may occasionally occur with:

• Reis-Bücklers corneal dystrophy
• Thiel-Behnke corneal dystrophy
• Lattice corneal dystrophy
• Granular corneal dystrophy
• Meesmann epithelial corneal dystrophy

Risk Factors

Factors associated with RCES include:

• Previous corneal trauma
• EBMD
• Dry eye disease
• Meibomian gland dysfunction
• Blepharitis
• Ocular rosacea
• Diabetes mellitus
• Nocturnal lagophthalmos
• Prior corneal refractive surgery
• Exposure keratopathy

Pathophysiology

Normal corneal epithelium adheres to the underlying basement membrane through:

• Hemidesmosomes
• Anchoring filaments
• Anchoring fibrils

In RCES these structures may be:

• Reduced
• Abnormal
• Poorly organized

resulting in unstable epithelial attachment.

Basement Membrane Abnormality

In EBMD, abnormal basement membrane may extend:

Anteriorly into the epithelial layer

and trap epithelial cells.

This produces:

• Microcysts
• Maps
• Fingerprint lines
• Poor epithelial adhesion

Matrix Metalloproteinases

Increased activity of:

• MMP-2
• MMP-9

has been implicated in degradation of epithelial adhesion structures.

This provides the rationale for using:

Oral tetracyclines such as doxycycline

in selected recurrent or refractory cases.

Why Episodes Occur on Awakening

During sleep:

• Tear secretion decreases
• The ocular surface becomes relatively dry
• The upper lid may adhere to unstable corneal epithelium

When the patient opens the eye:

The lid pulls the weakly attached epithelium away from Bowman membrane

causing abrupt pain and epithelial breakdown.

Clinical Presentation

Symptoms include:

• Severe sharp pain
• Foreign-body sensation
• Tearing
• Photophobia
• Redness
• Blepharospasm
• Blurred vision

Episodes may last:

• Minutes
• Hours
• Occasionally several days

Characteristic History

The classic patient reports:

“My eye is extremely painful when I first open it in the morning.”

The recurrent nature and morning timing are highly suggestive.

Frequency

Episodes may occur:

• Rarely
• Every few months
• Weekly
• Repeatedly within short periods

The severity may vary substantially between episodes.

Examination During an Acute Episode

Findings may include:

• Conjunctival injection
• Lid edema
• Tearing
• Blepharospasm
• Reduced visual acuity

Corneal findings range from subtle epithelial irregularity to a large epithelial defect.

Microform Erosion

A microform erosion may show:

• Punctate epithelial disturbance
• Small area of fluorescein staining
• Loose or irregular epithelium

Symptoms may nevertheless be severe.

Macroform Erosion

A macroform erosion causes:

• Large epithelial defect
• Positive fluorescein staining
• Loose surrounding epithelium
• Occasionally an epithelial flap or tag

Negative Fluorescein Staining

An important sign is:

Negative fluorescein staining

This occurs when elevated or abnormal epithelium disrupts the normal tear film, producing a dark area against surrounding fluorescent tear film.

It may identify:

• EBMD
• Loose epithelium
• Microcysts

The abnormal epithelial area may extend well beyond the obvious positive-staining defect.

Slit-Lamp Examination Between Episodes

The cornea may appear:

Almost normal

between attacks.

Careful examination should look for:

• Map lines
• Fingerprint lines
• Epithelial dots
• Microcysts
• Subtle loose epithelium

Use:

• Retroillumination
• Oblique illumination
• Broad-beam fluorescein examination

Location

Traumatic RCES typically recurs at:

The original injury site

EBMD-related erosions may occur at:

• Different corneal locations
• Either eye

The lower central cornea is commonly involved.

Diagnosis

Diagnosis is primarily:

Clinical

based on:

• Typical history
• Recurrent morning pain
• Slit-lamp evidence of unstable epithelium
• Previous trauma or EBMD

Routine laboratory or imaging studies are not required.

Corneal Sensation

Check corneal sensation when the course is atypical.

Reduced sensation raises concern for:

• Herpes simplex keratitis
• Neurotrophic keratopathy
• Trigeminal dysfunction

Anterior Segment OCT

AS-OCT is not routinely required.

It may occasionally help demonstrate:

• Irregular epithelium
• Basement membrane abnormalities

but diagnosis remains clinical.

In Vivo Confocal Microscopy

Confocal microscopy may demonstrate:

• Epithelial microcysts
• Abnormal basement membrane
• Altered subbasal nerves
• Anterior stromal changes

However:

These findings are not sufficiently specific to diagnose RCES routinely.

Differential Diagnosis

Important differentials include:

• Acute corneal abrasion
• Herpes simplex epithelial keratitis
• Infectious keratitis
• Dry eye disease
• Exposure keratopathy
• Neurotrophic keratopathy
• Meesmann dystrophy
• Bullous keratopathy
• Band keratopathy
• Salzmann nodular degeneration
• Trichiasis
• Subtarsal foreign body
• Recurrent foreign-body exposure
• Contact lens-related epithelial disease

RCES vs Herpes Simplex Keratitis

HSV epithelial keratitis may produce:

• Recurrent pain/redness
• Dendritic epithelial ulcer
• Reduced corneal sensation

RCES usually produces:

• Mechanical epithelial defect
• No true dendritic branching pattern
• Normal sensation unless another disorder coexists

Steroids should not be started casually if HSV is possible.

RCES vs Infectious Keratitis

Infectious keratitis is suggested by:

• Stromal infiltrate
• Purulent discharge
• Significant anterior chamber reaction
• Progressive focal ulceration
• Contact lens-related risk

A simple epithelial defect without infiltrate favors RCES.

Treatment Principles

Management has two goals:

1. Heal the acute epithelial defect
2. Prevent recurrence by improving epithelial adhesion

Treatment progresses from:

• Conservative therapy

to:

• Bandage contact lens

to:

• Procedural treatment for refractory disease

Acute Episode – Lubrication

Initial therapy usually includes:

• Frequent preservative-free artificial tears
• Lubricating ointment

Ointment is particularly useful:

At bedtime

to reduce friction during eyelid opening.

Hypertonic Saline

Hypertonic sodium chloride may improve epithelial adhesion by reducing epithelial edema.

Options include:

• Hypertonic drops during daytime
• 5% sodium chloride ointment at bedtime

It is commonly continued for:

Several months after the acute erosion heals

in recurrent disease.

Analgesia

Pain management may include:

• Oral acetaminophen
• Oral NSAIDs when appropriate
• Cycloplegic drops for significant photophobia or ciliary spasm

Topical Anesthetic Warning

Topical anesthetic may be used during examination but should generally:

Never be supplied for repeated unsupervised home use

because abuse can cause:

• Severe epithelial toxicity
• Nonhealing ulceration
• Stromal melt
• Infection

Topical Antibiotics

When a significant epithelial defect is present, a topical antibiotic may be used until re-epithelialization.

Common choices include:

• Antibiotic ointment
• Preservative-free antibiotic drops when appropriate

The purpose is:

Secondary infection prevention, not treatment of the underlying RCES.

Eye Patching

Routine pressure patching is:

No longer generally recommended

for RCES or uncomplicated corneal abrasions.

It provides little proven benefit and can:

• Delay assessment
• Increase infection concerns

Long-Term Lubrication

After epithelial healing, preventive therapy often consists of:

• Preservative-free tears during the day
• Lubricating or hypertonic ointment before sleep

for weeks to months.

This is first-line prevention for mild disease.

Treat Associated Ocular Surface Disease

Correct contributing factors such as:

• Blepharitis
• Meibomian gland dysfunction
• Dry eye
• Ocular rosacea
• Nocturnal lagophthalmos

This may substantially reduce recurrence.

Eyelid Hygiene

For associated MGD/blepharitis:

• Warm compresses
• Lid hygiene

may improve tear-film quality and reduce epithelial stress.

Bandage Contact Lens

For recurrent disease not controlled by lubrication, a:

Bandage soft contact lens (BCL)

may protect the epithelium from eyelid shear while adhesion complexes reform.

It may be used for:

• Several weeks

depending on severity and response.

BCL Advantages

A bandage lens can:

• Reduce pain
• Protect epithelium
• Promote healing
• Reduce mechanical trauma during blinking

BCL Safety

Because extended lens wear increases risk of:

Microbial keratitis

patients require:

• Close follow-up
• Strict hygiene
• Appropriate topical antibiotic prophylaxis while a significant epithelial defect is present or according to specialist protocol

Patients should return urgently for:

• Increased pain
• Increasing redness
• Discharge
• Reduced vision

Doxycycline

Oral doxycycline can be useful in recurrent or refractory RCES, particularly with:

• MGD
• Rosacea
• Chronic inflammation

Its benefit may reflect:

• MMP inhibition
• Anti-inflammatory action

rather than simply antimicrobial activity.

Doxycycline + Topical Steroid

A commonly used approach in recalcitrant RCES is:

Oral doxycycline + a short course of topical corticosteroid

to suppress:

• MMP activity
• Ocular surface inflammation

This is especially useful in patients with:

• MGD
• Rosacea

Treatment should be supervised because topical steroids can:

• Raise IOP
• Delay epithelial healing
• Worsen infection or HSV

Tetracycline Precautions

Doxycycline is generally avoided in:

• Pregnancy
• Patients with important tetracycline contraindications

Pediatric use depends on:

• Age
• Dose
• Clinical context

Autologous Serum Tears

For difficult recurrent disease, autologous serum tears may provide:

• Lubrication
• Growth factors
• Epitheliotrophic support

They can be useful in:

• Refractory epithelial instability
• Persistent epithelial defects

When to Consider a Procedure

Procedural treatment is appropriate when:

• Frequent recurrences persist despite lubrication
• BCL therapy fails
• Symptoms are severe
• Quality of life is significantly affected

Choice depends strongly on whether the abnormal epithelium is:

• Central
• Peripheral

Epithelial Debridement

Loose epithelium may be mechanically removed.

Simple debridement alone can relieve an acute episode, but:

Recurrence rates are relatively high if the abnormal basement membrane is not also treated.

Therefore it is often combined with:

• Diamond-burr polishing
• Other adhesion-promoting procedures

Diamond-Burr Superficial Keratectomy

Epithelial debridement with diamond-burr polishing of Bowman layer is one of the most effective procedures for recurrent RCES, particularly when:

• EBMD is present
• Lesions involve the visual axis

The procedure:

• Removes loose epithelium
• Smooths abnormal basement membrane/Bowman surface
• Promotes formation of stronger adhesion complexes

Diamond-Burr Advantages

Advantages include:

• High success rate
• Relatively low recurrence
• Can be used for central disease

Potential complications include:

• Transient haze
• Pain during healing
• Infection
• Refractive change

Anterior Stromal Puncture

Anterior stromal puncture (ASP) creates small scars that anchor epithelium more firmly to Bowman layer/anterior stroma.

It is best suited for:

Peripheral erosions outside the visual axis.

Why ASP Is Avoided Centrally

ASP can produce:

• Permanent punctate stromal scars
• Glare
• Reduced visual quality

Therefore it should generally:

Not be performed over the central visual axis.

Phototherapeutic Keratectomy

Phototherapeutic keratectomy (PTK) uses an excimer laser to remove abnormal:

• Epithelium
• Superficial Bowman layer

It is particularly useful for:

• Central recurrent erosions
• EBMD
• Disease refractory to simpler procedures

PTK Advantages

PTK provides:

• Precise superficial ablation
• Smooth optical surface
• Good recurrence control

PTK Risks

Potential complications include:

• Corneal haze
• Hyperopic shift
• Astigmatic change
• Recurrence
• Rare infection

The refractive effect depends on:

• Ablation depth
• Treatment diameter

Alcohol Delamination

Alcohol delamination uses dilute ethanol to loosen and remove abnormal epithelium.

It may:

• Remove diseased epithelium cleanly
• Allow regeneration of a more normal epithelial basement membrane

It remains a reasonable option in selected specialist practice, although diamond-burr polishing and PTK are more commonly emphasized in many modern treatment algorithms.

Post-Procedural Care

After debridement, diamond burr, PTK, or alcohol delamination:

• Bandage contact lens
• Topical antibiotic
• Preservative-free lubrication

are commonly used until epithelial healing.

A topical steroid may be used selectively after epithelial closure depending on:

• Procedure
• Haze
• Inflammation

Nocturnal Lagophthalmos

If episodes are associated with incomplete eyelid closure during sleep, management may include:

• Nighttime ointment
• Moisture chamber
• Eyelid taping in selected cases
• Treatment of underlying exposure disease

Prevention

Protective eyewear should be used for activities with risk of:

• Fingernail injury
• Plant/branch trauma
• Occupational debris

Prevention of the original epithelial injury can reduce traumatic RCES.

Follow-Up

During an acute large erosion, follow-up depends on:

• Defect size
• Pain
• Infection risk
• BCL use

Patients with a bandage contact lens or large defect often require review within:

24–48 hours

initially.

Long-Term Monitoring

Monitor for:

• Recurrence frequency
• Epithelial healing
• Stromal haze
• Infection
• Underlying EBMD
• Dry eye/MGD

Treatment response can be assessed by documenting:

• Frequency of attacks
• Duration
• Severity

Prognosis

The overall prognosis is:

Very good

Most patients eventually achieve substantial reduction or complete cessation of episodes with:

• Lubrication
• Ocular surface optimization
• BCL
• Procedural therapy when necessary

Recurrence

Recurrence remains possible after any treatment, particularly with:

• Diffuse EBMD
• Persistent dry eye
• MGD
• Continued ocular surface trauma

Repeat treatment is occasionally necessary.

Complications

Potential complications include:

• Infectious keratitis
• Corneal stromal haze
• Corneal scar
• Persistent epithelial defect
• Reduced vision
• Rare stromal thinning

The risk of infectious keratitis is increased with:

• Bandage contact lens use
• Topical steroid misuse
• Poor follow-up

Ophthalmology Pearls

• RCES causes recurrent breakdown of poorly adherent corneal epithelium, classically producing severe pain when the eye is first opened after sleep.
• The two major causes are previous corneal trauma and epithelial basement membrane dystrophy (EBMD).
• Traumatic erosions usually recur at the same site, whereas EBMD-related erosions may occur at multiple sites and may be bilateral.
• Look carefully for map-dot-fingerprint changes, microcysts, loose epithelium, and negative fluorescein staining.
• RCES results from abnormal epithelial adhesion involving hemidesmosomes, basement membrane, and anchoring fibrils.
• Increased MMP-2 and MMP-9 activity provides a rationale for doxycycline therapy in selected refractory cases.
• First-line prevention is preservative-free lubrication with nighttime ointment, often supplemented by hypertonic sodium chloride.
• Routine pressure patching is not generally recommended.
• Never provide topical anesthetic drops for repeated unsupervised home use because abuse can cause severe toxic keratopathy and corneal melt.
• A bandage contact lens can be highly effective for persistent disease but requires close follow-up because of microbial keratitis risk.
• Doxycycline plus a short topical steroid course can be useful in recalcitrant RCES, especially when MGD or rosacea is present.
• For persistent disease, diamond-burr superficial keratectomy is highly effective and can be used for central EBMD-related erosions.
• Anterior stromal puncture is best reserved for peripheral lesions outside the visual axis because it leaves small scars.
• PTK is an effective option for central or refractory disease but may cause haze or refractive shift.
• Simple epithelial debridement alone has a higher recurrence rate than procedures that also address the abnormal basement membrane/Bowman surface.
• Always reconsider HSV keratitis or infectious keratitis when an erosion behaves atypically or fails to heal as expected.
• Most patients ultimately achieve excellent symptom control with appropriately escalated therapy.