- Published on
Ophthalmology – Epiphora
Epiphora, commonly referred to as excessive tearing, results from an imbalance between tear production and tear drainage. Tears are produced by the lacrimal glands and normally drain through the nasolacrimal system into the nose. Any disruption in this balance—either overproduction due to irritation or impaired drainage due to obstruction—can lead to tearing.
Epidemiologically, epiphora shows a bimodal distribution, occurring most often in infants and older adults. In infants, the most common cause is congenital nasolacrimal duct obstruction, affecting about 5% of newborns, with 90% resolving spontaneously by age 1. In adults, tearing is frequently due to dry eye syndrome, particularly in postmenopausal women, where ocular surface irritation leads to reflex tearing.
The pathophysiology involves disruption of the normal tear film dynamics. Tears consist of aqueous, lipid, and mucin layers that maintain ocular surface health. Blinking helps pump tears into the drainage system. In infants, incomplete canalization of the nasolacrimal duct leads to obstruction. In adults, dry eye or tear film instability causes irritation and reflex tearing. Other contributors include blepharitis (affecting lipid layer), decreased tear production, eyelid malposition (e.g., ectropion), or obstruction from inflammation, trauma, or infection.
Etiologically, epiphora can be broadly divided into overproduction and outflow obstruction. Overproduction is usually secondary to ocular surface irritation, such as from trichiasis, entropion, keratitis, uveitis, conjunctivitis, or foreign bodies. Outflow obstruction may occur anywhere along the lacrimal drainage pathway due to infection (dacryocystitis), inflammation, trauma, or medication-induced stenosis. Poor tear pump function from eyelid laxity or facial nerve palsy may also contribute.
Clinically, infants present with constant tearing shortly after birth, often accompanied by crusting of eyelashes, especially after sleep, and symptoms may worsen with nasal congestion. Adults with dry eye typically report intermittent tearing, worsened by activities that reduce blinking (e.g., reading, screen use, driving) or environmental factors like wind and cold air. In contrast, patients with obstruction often have constant tearing and may have a history of infection or trauma.
Physical examination includes assessment of the tear film quality and quantity, eyelid position (looking for entropion, ectropion, or misdirected lashes), and ocular surface for signs of dry eye or inflammation. Evaluation of the lacrimal drainage system includes inspection of the puncta, canaliculi, and lacrimal sac, with palpation to check for reflux of discharge suggestive of obstruction or infection.
Diagnostic testing may include the fluorescein dye disappearance test, where persistence of dye suggests impaired drainage. Schirmer testing evaluates tear production, with less than 5 mm of wetting in 5 minutes indicating dry eye. Additional studies such as dacryocystography or lacrimal scintigraphy can help differentiate obstruction from pump failure. Imaging (CT scan) may be used if structural abnormalities, cysts, or tumors are suspected. Lacrimal irrigation in-office is a useful diagnostic tool in older children and adults.
The differential diagnosis varies by age. In children, causes include congenital nasolacrimal duct obstruction, congenital glaucoma, and epiblepharon. In adults, common causes include dry eye, nasolacrimal duct obstruction, eyelid malposition, trichiasis, and facial nerve palsy, while acute causes include conjunctivitis, keratitis, uveitis, or foreign body.
Management depends on the underlying cause. In infants, conservative treatment includes topical antibiotic ointment for discharge and lacrimal sac massage, which can help open the duct. Most cases resolve spontaneously. In adults with dry eye, artificial tears are first-line, with second-line options including topical cyclosporine or short-term steroids for inflammation. Acute causes require treatment of the underlying condition, such as antibiotics for infection or removal of a foreign body.
Procedural interventions include punctal occlusion for dry eye, punctoplasty for stenosis, and probing and irrigation for congenital obstruction. Surgical options such as dacryocystorhinostomy (DCR) are used for persistent nasolacrimal duct obstruction. Eyelid malpositions may require entropion or ectropion repair.
Follow-up varies by age and severity. Infants are typically observed during the first year, with surgery considered if symptoms persist beyond age 1. Adults are managed based on cause, with surgical follow-up as needed. Prognosis is excellent in pediatric cases, while in adults it depends on the underlying etiology—patients with obstruction often do well after surgery, whereas those with chronic dry eye may have ongoing intermittent symptoms.
Epiphora, commonly referred to as excessive tearing, results from an imbalance between tear production and tear drainage. Tears are produced by the lacrimal glands and normally drain through the nasolacrimal system into the nose. Any disruption in this balance—either overproduction due to irritation or impaired drainage due to obstruction—can lead to tearing.
Epidemiologically, epiphora shows a bimodal distribution, occurring most often in infants and older adults. In infants, the most common cause is congenital nasolacrimal duct obstruction, affecting about 5% of newborns, with 90% resolving spontaneously by age 1. In adults, tearing is frequently due to dry eye syndrome, particularly in postmenopausal women, where ocular surface irritation leads to reflex tearing.
The pathophysiology involves disruption of the normal tear film dynamics. Tears consist of aqueous, lipid, and mucin layers that maintain ocular surface health. Blinking helps pump tears into the drainage system. In infants, incomplete canalization of the nasolacrimal duct leads to obstruction. In adults, dry eye or tear film instability causes irritation and reflex tearing. Other contributors include blepharitis (affecting lipid layer), decreased tear production, eyelid malposition (e.g., ectropion), or obstruction from inflammation, trauma, or infection.
Etiologically, epiphora can be broadly divided into overproduction and outflow obstruction. Overproduction is usually secondary to ocular surface irritation, such as from trichiasis, entropion, keratitis, uveitis, conjunctivitis, or foreign bodies. Outflow obstruction may occur anywhere along the lacrimal drainage pathway due to infection (dacryocystitis), inflammation, trauma, or medication-induced stenosis. Poor tear pump function from eyelid laxity or facial nerve palsy may also contribute.
Clinically, infants present with constant tearing shortly after birth, often accompanied by crusting of eyelashes, especially after sleep, and symptoms may worsen with nasal congestion. Adults with dry eye typically report intermittent tearing, worsened by activities that reduce blinking (e.g., reading, screen use, driving) or environmental factors like wind and cold air. In contrast, patients with obstruction often have constant tearing and may have a history of infection or trauma.
Physical examination includes assessment of the tear film quality and quantity, eyelid position (looking for entropion, ectropion, or misdirected lashes), and ocular surface for signs of dry eye or inflammation. Evaluation of the lacrimal drainage system includes inspection of the puncta, canaliculi, and lacrimal sac, with palpation to check for reflux of discharge suggestive of obstruction or infection.
Diagnostic testing may include the fluorescein dye disappearance test, where persistence of dye suggests impaired drainage. Schirmer testing evaluates tear production, with less than 5 mm of wetting in 5 minutes indicating dry eye. Additional studies such as dacryocystography or lacrimal scintigraphy can help differentiate obstruction from pump failure. Imaging (CT scan) may be used if structural abnormalities, cysts, or tumors are suspected. Lacrimal irrigation in-office is a useful diagnostic tool in older children and adults.
The differential diagnosis varies by age. In children, causes include congenital nasolacrimal duct obstruction, congenital glaucoma, and epiblepharon. In adults, common causes include dry eye, nasolacrimal duct obstruction, eyelid malposition, trichiasis, and facial nerve palsy, while acute causes include conjunctivitis, keratitis, uveitis, or foreign body.
Management depends on the underlying cause. In infants, conservative treatment includes topical antibiotic ointment for discharge and lacrimal sac massage, which can help open the duct. Most cases resolve spontaneously. In adults with dry eye, artificial tears are first-line, with second-line options including topical cyclosporine or short-term steroids for inflammation. Acute causes require treatment of the underlying condition, such as antibiotics for infection or removal of a foreign body.
Procedural interventions include punctal occlusion for dry eye, punctoplasty for stenosis, and probing and irrigation for congenital obstruction. Surgical options such as dacryocystorhinostomy (DCR) are used for persistent nasolacrimal duct obstruction. Eyelid malpositions may require entropion or ectropion repair.
Follow-up varies by age and severity. Infants are typically observed during the first year, with surgery considered if symptoms persist beyond age 1. Adults are managed based on cause, with surgical follow-up as needed. Prognosis is excellent in pediatric cases, while in adults it depends on the underlying etiology—patients with obstruction often do well after surgery, whereas those with chronic dry eye may have ongoing intermittent symptoms.
- Published on
Ophthalmology – Entropion
Entropion is defined as an inward rotation of the eyelid margin, causing the eyelashes and periocular skin to rub against the ocular surface. This results in chronic irritation and can lead to corneal damage if untreated. It may be classified into four types: congenital, involutional (most common), spastic, and cicatricial.
Epidemiologically, involutional entropion increases with age and is the most frequently encountered type. Spastic entropion is typically temporary, often triggered by trauma, ocular irritation, or blepharospasm. Cicatricial entropion is less common but more severe, frequently associated with ocular cicatricial pemphigoid (OCP), which tends to affect older adults (age 60–70) and occurs more often in females. OCP has a prevalence of approximately 1 in 15,000–20,000 individuals.
The pathophysiology involves multiple mechanical and structural changes. These include increased orbicularis muscle tone and override, weakening or dehiscence of the lower eyelid retractors, horizontal eyelid laxity, and atrophy of the tarsal plate. In cicatricial cases, scarring of the conjunctiva leads to inward rotation of the lid margin.
Etiologically, entropion may result from aging changes, chronic use of certain topical medications (e.g., pilocarpine, timolol, epinephrine), or systemic autoimmune conditions such as ocular cicatricial pemphigoid, a type II hypersensitivity reaction with genetic predisposition (associated with HLA-DQB1*0301). Other associated conditions include Stevens–Johnson syndrome, trachoma, trauma, and chemical burns, all of which can lead to conjunctival scarring.
Patients typically present with foreign body sensation, tearing, redness, and irritation.
On examination, the eyelid margin is visibly inverted, with eyelashes rubbing against the cornea. Findings may include conjunctival injection, superficial punctate keratopathy, corneal abrasions, and in advanced cases, corneal scarring, thinning, ulceration, or neovascularization. In cicatricial entropion, additional features such as symblepharon (adhesion between palpebral and bulbar conjunctiva) and forniceal shortening may be present.
Diagnosis is primarily clinical. Laboratory testing is generally not required unless an autoimmune etiology such as OCP is suspected. In such cases, conjunctival biopsy with immunofluorescence can confirm the diagnosis, showing antibody deposition in over 80% of cases. Ancillary markers such as ANA or inflammatory mediators may also be elevated.
The differential diagnosis includes conditions that mimic eyelash irritation, such as epiblepharon (common in children), trichiasis (misdirected lashes), and distichiasis (extra row of lashes).
Management initially focuses on protecting the ocular surface. First-line treatment includes frequent lubrication with artificial tears and ointments. Temporary measures such as taping the lower eyelid to the cheek may help reposition the lid. In cases associated with OCP, systemic immunosuppressive therapy (e.g., prednisone, methotrexate, cyclophosphamide) may be required.
Definitive treatment is surgical, and most patients will eventually require it. Procedures include horizontal eyelid tightening, retractor repair, orbicularis muscle repositioning, or marginal rotation techniques. Simple suture repairs can be performed but have a higher recurrence rate.
Close follow-up is essential, typically within one week, to monitor for corneal complications. Patients should be educated to seek urgent care if they experience increased pain, redness, tearing, or photophobia, as these may indicate corneal involvement.
The prognosis is generally good with timely surgical correction. However, cicatricial causes like OCP may follow a chronic relapsing course and can lead to progressive vision loss if not adequately managed. Serious complications include corneal ulceration, scarring, perforation, and even loss of the eye, making early recognition and treatment critical.
- Published on
Ophthalmology – Enophthalmos
Enophthalmos refers to the posterior displacement of a normal-sized globe within the orbit, giving the appearance of a “sunken eye.” It can be congenital or acquired, with acquired causes being more common in clinical practice. The condition may develop gradually or suddenly, depending on the underlying etiology, and can be unilateral or bilateral.
The underlying pathophysiology depends on the cause. Congenital enophthalmos results from abnormal orbital development during fetal life. Acquired forms arise from mechanisms such as loss of orbital volume (fat atrophy), structural changes in the orbit (e.g., fractures or sinus disease), or fibrotic traction pulling the globe backward. Enlargement of the orbital cavity or loss of support from the orbital floor may also lead to associated hypoglobus (downward displacement of the globe).
Etiologically, enophthalmos can be grouped into three major categories: structural abnormalities, fat atrophy, and tractional causes. Common causes include orbital floor fractures, especially following trauma, postsurgical changes (such as orbital decompression or tumor removal), and silent sinus syndrome, where chronic maxillary sinus collapse leads to orbital floor descent. Other causes include orbital fat atrophy (e.g., due to radiation or systemic wasting), metastatic scirrhous carcinoma (notably breast cancer) causing fibrotic contraction, and orbital venous malformations. Neurologic and congenital conditions such as Duane retraction syndrome may also be associated.
Patients often report a gradual sinking of the eye or asymmetry in appearance. Some may notice a droopy eyelid or deepened upper eyelid sulcus, and historical photographs can be useful for comparison. On examination, key findings include deepened superior sulcus, narrowed palpebral fissure, and posterior displacement of the globe. Measurement with Hertel exophthalmometry can help quantify asymmetry, although it may be less useful in bilateral cases. Additional findings such as skin thinning (in atrophy) or thickening (in malignancy), as well as ocular motility or sensory deficits, may provide clues to the underlying cause. A full ocular exam is essential to assess visual acuity and optic nerve function, including evaluation for an afferent pupillary defect.
Imaging plays a crucial role in diagnosis. A CT scan of the orbits (axial and coronal views) is the primary modality to evaluate bony structures and orbital volume changes. If inflammatory or neoplastic causes are suspected, an MRI with contrast and fat suppression is indicated. In uncertain cases, orbital biopsy (orbitotomy) may be required for definitive diagnosis.
The differential diagnosis includes pseudo-enophthalmos, where the globe appears sunken but is actually normal in position. Causes include contralateral proptosis, Horner syndrome, phthisis bulbi, and microphthalmos.
Management depends on the underlying etiology. Orbital fractures may require surgical repair to restore orbital volume. Silent sinus syndrome is treated with functional endoscopic sinus surgery to re-aerate the sinus. In cases of volume loss, orbital augmentation with implants or fillers (e.g., hyaluronic acid) may be used. Oncologic causes require appropriate systemic evaluation and treatment.
Follow-up involves monitoring by an ophthalmologist, and in cases involving sinus disease, collaboration with an otolaryngologist is important. Patients should be advised to avoid nose blowing or forceful sneezing (with a closed mouth), particularly if an orbital fracture is suspected.
Chronic enophthalmos can be difficult to fully correct, especially if longstanding, and may lead to persistent cosmetic and functional concerns if not addressed early.
Enophthalmos refers to the posterior displacement of a normal-sized globe within the orbit, giving the appearance of a “sunken eye.” It can be congenital or acquired, with acquired causes being more common in clinical practice. The condition may develop gradually or suddenly, depending on the underlying etiology, and can be unilateral or bilateral.
The underlying pathophysiology depends on the cause. Congenital enophthalmos results from abnormal orbital development during fetal life. Acquired forms arise from mechanisms such as loss of orbital volume (fat atrophy), structural changes in the orbit (e.g., fractures or sinus disease), or fibrotic traction pulling the globe backward. Enlargement of the orbital cavity or loss of support from the orbital floor may also lead to associated hypoglobus (downward displacement of the globe).
Etiologically, enophthalmos can be grouped into three major categories: structural abnormalities, fat atrophy, and tractional causes. Common causes include orbital floor fractures, especially following trauma, postsurgical changes (such as orbital decompression or tumor removal), and silent sinus syndrome, where chronic maxillary sinus collapse leads to orbital floor descent. Other causes include orbital fat atrophy (e.g., due to radiation or systemic wasting), metastatic scirrhous carcinoma (notably breast cancer) causing fibrotic contraction, and orbital venous malformations. Neurologic and congenital conditions such as Duane retraction syndrome may also be associated.
Patients often report a gradual sinking of the eye or asymmetry in appearance. Some may notice a droopy eyelid or deepened upper eyelid sulcus, and historical photographs can be useful for comparison. On examination, key findings include deepened superior sulcus, narrowed palpebral fissure, and posterior displacement of the globe. Measurement with Hertel exophthalmometry can help quantify asymmetry, although it may be less useful in bilateral cases. Additional findings such as skin thinning (in atrophy) or thickening (in malignancy), as well as ocular motility or sensory deficits, may provide clues to the underlying cause. A full ocular exam is essential to assess visual acuity and optic nerve function, including evaluation for an afferent pupillary defect.
Imaging plays a crucial role in diagnosis. A CT scan of the orbits (axial and coronal views) is the primary modality to evaluate bony structures and orbital volume changes. If inflammatory or neoplastic causes are suspected, an MRI with contrast and fat suppression is indicated. In uncertain cases, orbital biopsy (orbitotomy) may be required for definitive diagnosis.
The differential diagnosis includes pseudo-enophthalmos, where the globe appears sunken but is actually normal in position. Causes include contralateral proptosis, Horner syndrome, phthisis bulbi, and microphthalmos.
Management depends on the underlying etiology. Orbital fractures may require surgical repair to restore orbital volume. Silent sinus syndrome is treated with functional endoscopic sinus surgery to re-aerate the sinus. In cases of volume loss, orbital augmentation with implants or fillers (e.g., hyaluronic acid) may be used. Oncologic causes require appropriate systemic evaluation and treatment.
Follow-up involves monitoring by an ophthalmologist, and in cases involving sinus disease, collaboration with an otolaryngologist is important. Patients should be advised to avoid nose blowing or forceful sneezing (with a closed mouth), particularly if an orbital fracture is suspected.
Chronic enophthalmos can be difficult to fully correct, especially if longstanding, and may lead to persistent cosmetic and functional concerns if not addressed early.
- Published on
Ophthalmology – Endophthalmitis
Endophthalmitis is a severe, vision-threatening intraocular inflammatory condition involving the vitreous and aqueous humors, most commonly due to infection. It is considered an ophthalmic emergency, as rapid progression can lead to permanent vision loss or blindness. The condition is broadly classified into infectious (postoperative, posttraumatic, or endogenous) and noninfectious (sterile) forms, the latter mimicking infection clinically.
Most cases are postoperative (approximately 75%), particularly following cataract surgery, with an incidence of about 0.05–0.16%. Posttraumatic cases account for about 20%, often associated with penetrating injuries or retained intraocular foreign bodies. Endogenous cases (around 5%) occur when infection spreads hematogenously from a distant systemic source, typically in immunocompromised individuals, intravenous drug users, or patients with indwelling catheters.
The pathophysiology involves rapid microbial proliferation within the vitreous cavity, followed by a robust inflammatory response. Within 24 hours, inflammatory cells infiltrate ocular tissues, and by 48 hours, irreversible photoreceptor damage may occur. Even after microbial control, inflammatory mediators and endotoxins may continue to damage intraocular structures.
Patients typically present with acute onset of eye pain, decreased vision, and redness, often with a history of recent surgery, trauma, or systemic infection. Examination findings may include conjunctival injection, corneal edema, hypopyon (layering of pus in the anterior chamber), anterior chamber inflammation, and dense vitreitis, often obscuring the view of the retina. Postoperative and traumatic cases are usually unilateral, while endogenous cases may be bilateral.
Diagnosis is primarily clinical but supported by investigations. A vitreous tap is performed to obtain samples for Gram stain, culture, and fungal studies. In suspected endogenous cases, blood and urine cultures may help identify the systemic source, and an echocardiogram may be required to rule out endocarditis. B-scan ultrasonography is useful when the retina cannot be visualized, helping detect vitreous inflammation or retinal detachment.
Management requires urgent intravitreal antibiotic therapy, targeting both Gram-positive and Gram-negative organisms. Common regimens include vancomycin and ceftazidime, often combined with intravitreal corticosteroids to reduce inflammation. In suspected fungal infections, intravitreal antifungal agents are used. Patients with very poor vision (light perception only) typically require pars plana vitrectomy, which removes infected vitreous material and improves drug penetration.
Close monitoring is essential, often requiring daily follow-up until stabilization. Additional treatments may include repeat intravitreal injections or delayed vitrectomy if response is inadequate. Endogenous cases require systemic evaluation and treatment of the underlying infection, often in collaboration with infectious disease specialists.
Despite advances in treatment, the prognosis remains guarded, with a significant risk of permanent vision impairment or blindness. Early diagnosis and prompt intervention greatly improve outcomes. Complications include retinal detachment and phthisis bulbi, both of which can lead to irreversible vision loss.
Endophthalmitis is a severe, vision-threatening intraocular inflammatory condition involving the vitreous and aqueous humors, most commonly due to infection. It is considered an ophthalmic emergency, as rapid progression can lead to permanent vision loss or blindness. The condition is broadly classified into infectious (postoperative, posttraumatic, or endogenous) and noninfectious (sterile) forms, the latter mimicking infection clinically.
Most cases are postoperative (approximately 75%), particularly following cataract surgery, with an incidence of about 0.05–0.16%. Posttraumatic cases account for about 20%, often associated with penetrating injuries or retained intraocular foreign bodies. Endogenous cases (around 5%) occur when infection spreads hematogenously from a distant systemic source, typically in immunocompromised individuals, intravenous drug users, or patients with indwelling catheters.
The pathophysiology involves rapid microbial proliferation within the vitreous cavity, followed by a robust inflammatory response. Within 24 hours, inflammatory cells infiltrate ocular tissues, and by 48 hours, irreversible photoreceptor damage may occur. Even after microbial control, inflammatory mediators and endotoxins may continue to damage intraocular structures.
Patients typically present with acute onset of eye pain, decreased vision, and redness, often with a history of recent surgery, trauma, or systemic infection. Examination findings may include conjunctival injection, corneal edema, hypopyon (layering of pus in the anterior chamber), anterior chamber inflammation, and dense vitreitis, often obscuring the view of the retina. Postoperative and traumatic cases are usually unilateral, while endogenous cases may be bilateral.
Diagnosis is primarily clinical but supported by investigations. A vitreous tap is performed to obtain samples for Gram stain, culture, and fungal studies. In suspected endogenous cases, blood and urine cultures may help identify the systemic source, and an echocardiogram may be required to rule out endocarditis. B-scan ultrasonography is useful when the retina cannot be visualized, helping detect vitreous inflammation or retinal detachment.
Management requires urgent intravitreal antibiotic therapy, targeting both Gram-positive and Gram-negative organisms. Common regimens include vancomycin and ceftazidime, often combined with intravitreal corticosteroids to reduce inflammation. In suspected fungal infections, intravitreal antifungal agents are used. Patients with very poor vision (light perception only) typically require pars plana vitrectomy, which removes infected vitreous material and improves drug penetration.
Close monitoring is essential, often requiring daily follow-up until stabilization. Additional treatments may include repeat intravitreal injections or delayed vitrectomy if response is inadequate. Endogenous cases require systemic evaluation and treatment of the underlying infection, often in collaboration with infectious disease specialists.
Despite advances in treatment, the prognosis remains guarded, with a significant risk of permanent vision impairment or blindness. Early diagnosis and prompt intervention greatly improve outcomes. Complications include retinal detachment and phthisis bulbi, both of which can lead to irreversible vision loss.
- Published on
Ophthalmology – Ehlers–Danlos Syndrome
Ehlers–Danlos syndrome (EDS) is a group of inherited connective tissue disorders characterized by joint hypermobility, hyperextensible skin, and tissue fragility. It encompasses several subtypes, including the classic, hypermobility, vascular, kyphoscoliosis (ocular-scoliotic), arthrochalasis, dermatosparaxis, and tenascin-X–deficient types, each with varying systemic and ocular involvement. The kyphoscoliosis type is particularly important in ophthalmology due to its association with globe fragility and severe ocular complications.
EDS has an estimated prevalence of 1 in 5,000–10,000 individuals, though milder forms may go undiagnosed. The condition arises from genetic mutations affecting collagen synthesis or structure, involving genes such as COL1A2, COL3A1, COL5A1, COL5A2, and others. Depending on the subtype, inheritance may be autosomal dominant or autosomal recessive. These mutations result in defective collagen, particularly types I and III, leading to weakened connective tissues throughout the body.
Clinically, patients often present with soft, hyperextensible, fragile skin, easy bruising, and joint laxity with frequent dislocations. Poor wound healing and abnormal scarring are common. Systemic manifestations may include cardiac abnormalities (such as mitral valve prolapse), gastrointestinal issues, and musculoskeletal deformities like scoliosis or flat feet.
Ocular involvement is diverse and clinically significant. Patients may develop retinal detachment, retinal hemorrhages, keratoconus, lens subluxation (ectopia lentis), glaucoma, strabismus, and severe myopia. Other notable features include blue sclera, angioid streaks, dry eye symptoms, and in severe cases, globe rupture due to scleral fragility. These findings highlight the importance of regular ophthalmologic monitoring in affected individuals.
Diagnosis is primarily clinical, supported by genetic testing and specialized studies such as collagen analysis. Additional evaluations may include echocardiography to assess cardiac involvement. Histologically, collagen fibers appear irregular, sparse, and disorganized. There are no routine screening laboratory tests, but targeted testing is guided by suspected subtype.
Management of EDS is largely supportive, as there is no definitive cure. Patients are advised to avoid trauma and contact sports, particularly in high-risk subtypes such as vascular EDS. Vitamin C supplementation may be recommended as it plays a role in collagen synthesis, though evidence is limited. Surgical procedures require special caution due to poor wound healing and increased bleeding risk.
Ongoing care involves a multidisciplinary approach, including ophthalmology, cardiology, orthopedics, and genetics. Regular eye examinations are essential to monitor for complications such as retinal detachment or glaucoma. Genetic counseling is strongly recommended, especially for family planning.
The prognosis varies by subtype. Many individuals have a normal lifespan, particularly in milder forms, but more severe types—especially the vascular and kyphoscoliosis forms—carry risks of arterial rupture, organ rupture, and ocular complications, which can be life-threatening.
Ehlers–Danlos syndrome (EDS) is a group of inherited connective tissue disorders characterized by joint hypermobility, hyperextensible skin, and tissue fragility. It encompasses several subtypes, including the classic, hypermobility, vascular, kyphoscoliosis (ocular-scoliotic), arthrochalasis, dermatosparaxis, and tenascin-X–deficient types, each with varying systemic and ocular involvement. The kyphoscoliosis type is particularly important in ophthalmology due to its association with globe fragility and severe ocular complications.
EDS has an estimated prevalence of 1 in 5,000–10,000 individuals, though milder forms may go undiagnosed. The condition arises from genetic mutations affecting collagen synthesis or structure, involving genes such as COL1A2, COL3A1, COL5A1, COL5A2, and others. Depending on the subtype, inheritance may be autosomal dominant or autosomal recessive. These mutations result in defective collagen, particularly types I and III, leading to weakened connective tissues throughout the body.
Clinically, patients often present with soft, hyperextensible, fragile skin, easy bruising, and joint laxity with frequent dislocations. Poor wound healing and abnormal scarring are common. Systemic manifestations may include cardiac abnormalities (such as mitral valve prolapse), gastrointestinal issues, and musculoskeletal deformities like scoliosis or flat feet.
Ocular involvement is diverse and clinically significant. Patients may develop retinal detachment, retinal hemorrhages, keratoconus, lens subluxation (ectopia lentis), glaucoma, strabismus, and severe myopia. Other notable features include blue sclera, angioid streaks, dry eye symptoms, and in severe cases, globe rupture due to scleral fragility. These findings highlight the importance of regular ophthalmologic monitoring in affected individuals.
Diagnosis is primarily clinical, supported by genetic testing and specialized studies such as collagen analysis. Additional evaluations may include echocardiography to assess cardiac involvement. Histologically, collagen fibers appear irregular, sparse, and disorganized. There are no routine screening laboratory tests, but targeted testing is guided by suspected subtype.
Management of EDS is largely supportive, as there is no definitive cure. Patients are advised to avoid trauma and contact sports, particularly in high-risk subtypes such as vascular EDS. Vitamin C supplementation may be recommended as it plays a role in collagen synthesis, though evidence is limited. Surgical procedures require special caution due to poor wound healing and increased bleeding risk.
Ongoing care involves a multidisciplinary approach, including ophthalmology, cardiology, orthopedics, and genetics. Regular eye examinations are essential to monitor for complications such as retinal detachment or glaucoma. Genetic counseling is strongly recommended, especially for family planning.
The prognosis varies by subtype. Many individuals have a normal lifespan, particularly in milder forms, but more severe types—especially the vascular and kyphoscoliosis forms—carry risks of arterial rupture, organ rupture, and ocular complications, which can be life-threatening.
- Published on
Ophthalmology – Dyslexia
Dyslexia is a primary reading disorder characterized by difficulty in acquiring accurate and fluent reading skills due to a language-processing abnormality in the brain. It is not caused by poor vision, low intelligence, lack of motivation, or inadequate teaching. Instead, dyslexia primarily results from a deficit in phonological processing, meaning difficulty in recognizing and manipulating the sounds of language. Historically referred to as “word blindness,” it is now well established that dyslexia is not a visual disorder, although children may appear to skip words or reverse letters due to underlying language-processing challenges.
Dyslexia is relatively common, affecting approximately 5–17% of children, with boys diagnosed more frequently than girls. It exists along a continuum of reading ability in the population, with dyslexia representing the lower end. There is a strong genetic component, with heritability estimated between 54–75%. It often runs in families, and multiple genetic loci have been identified, supporting a polygenic inheritance pattern.
The underlying pathophysiology involves abnormal activation of left hemisphere brain regions responsible for reading, particularly the temporoparietal and occipitotemporal areas. Individuals with dyslexia show reduced activity in these regions and may compensate by using alternative neural pathways, such as frontal brain regions. These differences highlight that dyslexia is a neurobiological disorder of language processing, not an ocular or visual tracking problem.
Clinically, younger children may present with language delay, difficulty learning letters, trouble with rhymes, or mispronouncing words. Older children often demonstrate slow, effortful reading, poor spelling, and a mismatch between their reading ability and overall intelligence. Importantly, children with dyslexia generally have normal eye health and visual function, and any abnormal eye movements observed are a consequence—not a cause—of reading difficulty.
Evaluation of suspected dyslexia includes hearing and vision screening to rule out contributing factors, followed by formal educational and neuropsychological testing. Diagnosis is made using standardized assessments of reading, phonological processing, and comprehension by trained specialists such as psychologists or educators. Imaging studies are not routinely required.
Management is centered on early, structured educational intervention, particularly focusing on phonological awareness and decoding skills. Early intervention (especially between ages 6–8) significantly improves outcomes. Older children benefit from academic accommodations, such as extra time, audiobooks, and assistive technology. It is important to note that vision therapy, eye exercises, and colored lenses have not been proven effective for treating dyslexia.
The prognosis is variable but generally reflects a chronic condition rather than a temporary delay. Without early intervention, reading difficulties often persist into adolescence and adulthood. However, with appropriate support and tailored instruction, many individuals with dyslexia can achieve strong academic and functional outcomes.
Dyslexia is a primary reading disorder characterized by difficulty in acquiring accurate and fluent reading skills due to a language-processing abnormality in the brain. It is not caused by poor vision, low intelligence, lack of motivation, or inadequate teaching. Instead, dyslexia primarily results from a deficit in phonological processing, meaning difficulty in recognizing and manipulating the sounds of language. Historically referred to as “word blindness,” it is now well established that dyslexia is not a visual disorder, although children may appear to skip words or reverse letters due to underlying language-processing challenges.
Dyslexia is relatively common, affecting approximately 5–17% of children, with boys diagnosed more frequently than girls. It exists along a continuum of reading ability in the population, with dyslexia representing the lower end. There is a strong genetic component, with heritability estimated between 54–75%. It often runs in families, and multiple genetic loci have been identified, supporting a polygenic inheritance pattern.
The underlying pathophysiology involves abnormal activation of left hemisphere brain regions responsible for reading, particularly the temporoparietal and occipitotemporal areas. Individuals with dyslexia show reduced activity in these regions and may compensate by using alternative neural pathways, such as frontal brain regions. These differences highlight that dyslexia is a neurobiological disorder of language processing, not an ocular or visual tracking problem.
Clinically, younger children may present with language delay, difficulty learning letters, trouble with rhymes, or mispronouncing words. Older children often demonstrate slow, effortful reading, poor spelling, and a mismatch between their reading ability and overall intelligence. Importantly, children with dyslexia generally have normal eye health and visual function, and any abnormal eye movements observed are a consequence—not a cause—of reading difficulty.
Evaluation of suspected dyslexia includes hearing and vision screening to rule out contributing factors, followed by formal educational and neuropsychological testing. Diagnosis is made using standardized assessments of reading, phonological processing, and comprehension by trained specialists such as psychologists or educators. Imaging studies are not routinely required.
Management is centered on early, structured educational intervention, particularly focusing on phonological awareness and decoding skills. Early intervention (especially between ages 6–8) significantly improves outcomes. Older children benefit from academic accommodations, such as extra time, audiobooks, and assistive technology. It is important to note that vision therapy, eye exercises, and colored lenses have not been proven effective for treating dyslexia.
The prognosis is variable but generally reflects a chronic condition rather than a temporary delay. Without early intervention, reading difficulties often persist into adolescence and adulthood. However, with appropriate support and tailored instruction, many individuals with dyslexia can achieve strong academic and functional outcomes.
- Published on
Toxicology – Drugs Causing Hypertension
Amphetamines
Amphetamines enhance the release of catecholamines, producing significant increases in blood pressure and heart rate.
Caffeine
Caffeine stimulates adrenergic activity, causing hypertension and tachycardia. In large overdoses, it may paradoxically result in hypotension and cardiovascular collapse.
Cocaine
Cocaine increases synaptic concentrations of serotonin, dopamine, and norepinephrine by blocking their reuptake, resulting in elevated blood pressure and heart rate.
Anticholinergics
Anticholinergic drugs suppress parasympathetic activity, leading to increased heart rate and elevated blood pressure.
Nicotine
Nicotine toxicity initially presents with hypertension and tachycardia, which may later progress to bradycardia and hypotension.
Sympathomimetics
These agents increase blood pressure and heart rate by promoting catecholamine release, decreasing their reuptake, or inhibiting their breakdown.
Thyroid Hormone
Excess thyroid hormone elevates basal metabolic rate and enhances responsiveness to catecholamines. In severe overdose, this may lead to cardiac dysrhythmias followed by hypotension and cardiovascular collapse.
Treatment
Benzodiazepines are the first-line treatment for hypertension due to sympathomimetic toxicity. Pure β-blockers should be avoided because they can cause unopposed α-adrenergic stimulation and worsen hypertension. Agents such as labetalol are preferred due to their combined α- and β-blocking effects.
Amphetamines
Amphetamines enhance the release of catecholamines, producing significant increases in blood pressure and heart rate.
Caffeine
Caffeine stimulates adrenergic activity, causing hypertension and tachycardia. In large overdoses, it may paradoxically result in hypotension and cardiovascular collapse.
Cocaine
Cocaine increases synaptic concentrations of serotonin, dopamine, and norepinephrine by blocking their reuptake, resulting in elevated blood pressure and heart rate.
Anticholinergics
Anticholinergic drugs suppress parasympathetic activity, leading to increased heart rate and elevated blood pressure.
Nicotine
Nicotine toxicity initially presents with hypertension and tachycardia, which may later progress to bradycardia and hypotension.
Sympathomimetics
These agents increase blood pressure and heart rate by promoting catecholamine release, decreasing their reuptake, or inhibiting their breakdown.
Thyroid Hormone
Excess thyroid hormone elevates basal metabolic rate and enhances responsiveness to catecholamines. In severe overdose, this may lead to cardiac dysrhythmias followed by hypotension and cardiovascular collapse.
Treatment
Benzodiazepines are the first-line treatment for hypertension due to sympathomimetic toxicity. Pure β-blockers should be avoided because they can cause unopposed α-adrenergic stimulation and worsen hypertension. Agents such as labetalol are preferred due to their combined α- and β-blocking effects.
- Published on
Ophthalmology – Duane Syndrome
Duane syndrome is a congenital eye movement disorder characterized primarily by limited abduction (outward movement of the eye), along with globe retraction and narrowing of the palpebral fissure on attempted adduction. It is classified into three types: Type I, the most common, shows marked limitation of abduction with relatively preserved adduction; Type II shows limitation of adduction with exotropia; and Type III involves limitation of both abduction and adduction. The condition is part of a group known as congenital cranial dysinnervation disorders, reflecting abnormal nerve supply to the extraocular muscles.
Duane syndrome accounts for about 1% of all strabismus cases and is more common in females, with unilateral involvement being more typical than bilateral. Risk factors include thalidomide exposure during early pregnancy and associations with certain congenital syndromes. Genetically, mutations in genes such as CHN1 and CPAH have been identified, usually with an autosomal dominant inheritance pattern, though many cases are sporadic.
The underlying pathophysiology involves absence or hypoplasia of the sixth cranial nerve (abducens nerve) and abnormal innervation of the lateral rectus muscle by the oculomotor nerve. This leads to co-contraction of medial and lateral rectus muscles, causing globe retraction and narrowing of the eyelid fissure during adduction. The characteristic upshoots and downshoots seen in some patients are thought to result from a mechanical “leash effect” or anomalous muscle innervation.
Clinically, children often present with an eye that does not move outward properly, sometimes associated with esotropia and a compensatory head turn (face turn) to maintain binocular vision. On examination, key findings include limited abduction, variable limitation of adduction, globe retraction on adduction, and vertical upshoots or downshoots. A full ocular exam is essential, particularly to assess for amblyopia, refractive error, and abnormal head posture. Some patients may also have associated ocular findings such as iris abnormalities, cataracts, or coloboma, as well as systemic associations like hearing loss.
Diagnosis is primarily clinical, though high-resolution MRI may demonstrate absence or abnormality of the sixth nerve. Audiologic evaluation is recommended in cases with suspected associated syndromes. The differential diagnosis includes sixth nerve palsy, congenital esotropia, and orbital restrictive conditions.
Management focuses on optimizing vision and alignment. Refractive errors and amblyopia must be treated first with glasses or occlusion therapy. Surgical intervention is considered when there is a significant deviation in primary gaze, abnormal head posture, or cosmetically significant globe retraction or up/down shoots. Surgical approaches typically involve recession of the medial or lateral rectus muscles, and in selected cases, muscle transposition procedures. Importantly, resection of the lateral rectus is generally avoided as it can worsen globe retraction.
The prognosis for vision is excellent if amblyopia is addressed early. While surgery can improve alignment and reduce abnormal head posture, it does not fully restore normal eye movements, particularly abduction. Long-term follow-up is important to monitor for amblyopia, recurrent strabismus, and head posture abnormalities.
Duane syndrome is a congenital eye movement disorder characterized primarily by limited abduction (outward movement of the eye), along with globe retraction and narrowing of the palpebral fissure on attempted adduction. It is classified into three types: Type I, the most common, shows marked limitation of abduction with relatively preserved adduction; Type II shows limitation of adduction with exotropia; and Type III involves limitation of both abduction and adduction. The condition is part of a group known as congenital cranial dysinnervation disorders, reflecting abnormal nerve supply to the extraocular muscles.
Duane syndrome accounts for about 1% of all strabismus cases and is more common in females, with unilateral involvement being more typical than bilateral. Risk factors include thalidomide exposure during early pregnancy and associations with certain congenital syndromes. Genetically, mutations in genes such as CHN1 and CPAH have been identified, usually with an autosomal dominant inheritance pattern, though many cases are sporadic.
The underlying pathophysiology involves absence or hypoplasia of the sixth cranial nerve (abducens nerve) and abnormal innervation of the lateral rectus muscle by the oculomotor nerve. This leads to co-contraction of medial and lateral rectus muscles, causing globe retraction and narrowing of the eyelid fissure during adduction. The characteristic upshoots and downshoots seen in some patients are thought to result from a mechanical “leash effect” or anomalous muscle innervation.
Clinically, children often present with an eye that does not move outward properly, sometimes associated with esotropia and a compensatory head turn (face turn) to maintain binocular vision. On examination, key findings include limited abduction, variable limitation of adduction, globe retraction on adduction, and vertical upshoots or downshoots. A full ocular exam is essential, particularly to assess for amblyopia, refractive error, and abnormal head posture. Some patients may also have associated ocular findings such as iris abnormalities, cataracts, or coloboma, as well as systemic associations like hearing loss.
Diagnosis is primarily clinical, though high-resolution MRI may demonstrate absence or abnormality of the sixth nerve. Audiologic evaluation is recommended in cases with suspected associated syndromes. The differential diagnosis includes sixth nerve palsy, congenital esotropia, and orbital restrictive conditions.
Management focuses on optimizing vision and alignment. Refractive errors and amblyopia must be treated first with glasses or occlusion therapy. Surgical intervention is considered when there is a significant deviation in primary gaze, abnormal head posture, or cosmetically significant globe retraction or up/down shoots. Surgical approaches typically involve recession of the medial or lateral rectus muscles, and in selected cases, muscle transposition procedures. Importantly, resection of the lateral rectus is generally avoided as it can worsen globe retraction.
The prognosis for vision is excellent if amblyopia is addressed early. While surgery can improve alignment and reduce abnormal head posture, it does not fully restore normal eye movements, particularly abduction. Long-term follow-up is important to monitor for amblyopia, recurrent strabismus, and head posture abnormalities.
- Published on
Ophthalmology – Ectropion
Ectropion is defined as an outward turning (eversion) of the eyelid margin, most commonly affecting the lower eyelid. This malposition disrupts normal eyelid function, leading to exposure of the ocular surface and improper tear drainage. Ectropion is classified into several types, including involutional (age-related, most common), paralytic, cicatricial, and congenital forms.
The condition is most frequently seen in older adults, particularly due to age-related tissue changes. Risk factors include sun exposure, smoking, diabetes, hypertension, and prior facial or eyelid surgery. Paralytic ectropion is often associated with facial nerve (7th nerve) palsy, such as in Bell’s palsy, while cicatricial ectropion results from skin contracture due to scarring, trauma, inflammation, or tumors.
Pathophysiologically, involutional ectropion results from horizontal eyelid laxity and weakening of supporting structures. Paralytic ectropion occurs due to loss of orbicularis oculi muscle tone, leading to poor eyelid closure and sagging. Cicatricial ectropion is caused by shortening or tightening of the anterior lamella (skin), pulling the eyelid outward. These mechanisms ultimately result in poor eyelid-globe apposition and exposure of the conjunctiva and cornea.
Patients typically present with tearing (epiphora), redness, foreign body sensation, mucous discharge, and irritation. Symptoms occur because the lacrimal punctum is everted, preventing proper tear drainage, and because of ocular surface exposure. On examination, findings include visible outward turning of the eyelid, punctal eversion, lagophthalmos (incomplete eyelid closure), conjunctival redness, and superficial punctate keratitis. In paralytic cases, signs of facial nerve dysfunction such as reduced eyelid closure strength are evident.
Diagnosis is primarily clinical, though additional testing may be required depending on the cause. For example, Lyme titers may be checked in suspected infectious facial palsy, and evaluation for herpes zoster or systemic disease may be indicated. The differential diagnosis includes conditions such as thyroid eye disease and floppy eyelid syndrome.
Management depends on severity and underlying cause. Initial treatment focuses on ocular surface protection, including artificial tears, gels, and ointments to prevent dryness and corneal damage. In cases of infection or inflammation, topical antibiotic or steroid ointments may be used. For paralytic ectropion, treatment may include systemic corticosteroids, antivirals, or antibiotics, depending on etiology.
Supportive measures include warm compresses, eyelid taping, and massage, particularly in mild or temporary cases. However, definitive treatment is often surgical. Involutional ectropion is typically corrected with horizontal eyelid tightening procedures, while paralytic ectropion may require procedures such as gold weight implantation in the upper eyelid to improve closure. Cicatricial ectropion often requires skin grafting or reconstructive procedures to address tissue deficiency.
Follow-up is important to monitor for complications, particularly corneal exposure. Prognosis is generally good, especially when treated early. However, untreated ectropion can lead to serious complications such as corneal abrasion, ulceration, scarring, and even perforation, making timely management essential.
Ectropion is defined as an outward turning (eversion) of the eyelid margin, most commonly affecting the lower eyelid. This malposition disrupts normal eyelid function, leading to exposure of the ocular surface and improper tear drainage. Ectropion is classified into several types, including involutional (age-related, most common), paralytic, cicatricial, and congenital forms.
The condition is most frequently seen in older adults, particularly due to age-related tissue changes. Risk factors include sun exposure, smoking, diabetes, hypertension, and prior facial or eyelid surgery. Paralytic ectropion is often associated with facial nerve (7th nerve) palsy, such as in Bell’s palsy, while cicatricial ectropion results from skin contracture due to scarring, trauma, inflammation, or tumors.
Pathophysiologically, involutional ectropion results from horizontal eyelid laxity and weakening of supporting structures. Paralytic ectropion occurs due to loss of orbicularis oculi muscle tone, leading to poor eyelid closure and sagging. Cicatricial ectropion is caused by shortening or tightening of the anterior lamella (skin), pulling the eyelid outward. These mechanisms ultimately result in poor eyelid-globe apposition and exposure of the conjunctiva and cornea.
Patients typically present with tearing (epiphora), redness, foreign body sensation, mucous discharge, and irritation. Symptoms occur because the lacrimal punctum is everted, preventing proper tear drainage, and because of ocular surface exposure. On examination, findings include visible outward turning of the eyelid, punctal eversion, lagophthalmos (incomplete eyelid closure), conjunctival redness, and superficial punctate keratitis. In paralytic cases, signs of facial nerve dysfunction such as reduced eyelid closure strength are evident.
Diagnosis is primarily clinical, though additional testing may be required depending on the cause. For example, Lyme titers may be checked in suspected infectious facial palsy, and evaluation for herpes zoster or systemic disease may be indicated. The differential diagnosis includes conditions such as thyroid eye disease and floppy eyelid syndrome.
Management depends on severity and underlying cause. Initial treatment focuses on ocular surface protection, including artificial tears, gels, and ointments to prevent dryness and corneal damage. In cases of infection or inflammation, topical antibiotic or steroid ointments may be used. For paralytic ectropion, treatment may include systemic corticosteroids, antivirals, or antibiotics, depending on etiology.
Supportive measures include warm compresses, eyelid taping, and massage, particularly in mild or temporary cases. However, definitive treatment is often surgical. Involutional ectropion is typically corrected with horizontal eyelid tightening procedures, while paralytic ectropion may require procedures such as gold weight implantation in the upper eyelid to improve closure. Cicatricial ectropion often requires skin grafting or reconstructive procedures to address tissue deficiency.
Follow-up is important to monitor for complications, particularly corneal exposure. Prognosis is generally good, especially when treated early. However, untreated ectropion can lead to serious complications such as corneal abrasion, ulceration, scarring, and even perforation, making timely management essential.
- Published on
Ophthalmology – Eales Disease
Eales disease is an idiopathic obliterative retinal vasculopathy that primarily affects young adults, classically presenting with a triad of retinal phlebitis, peripheral retinal nonperfusion, and recurrent vitreous hemorrhage. It is considered a diagnosis of exclusion, meaning other causes of retinal vasculitis must be ruled out before confirming the condition.
The disease is most commonly reported in regions such as India and the Middle East, typically affecting individuals between 20 and 30 years of age. Earlier studies suggested a male predominance, but more recent data indicate a more equal gender distribution. A possible association with hypersensitivity to tuberculin protein has been proposed, and tubercle bacilli have occasionally been identified in pathological specimens, although the exact cause remains unclear.
Pathophysiologically, Eales disease involves a nonspecific inflammatory occlusive vasculitis, primarily affecting retinal veins. This leads to vascular inflammation (phlebitis), followed by capillary closure and ischemia, which in turn stimulates retinal neovascularization. These fragile new vessels are prone to bleeding, resulting in recurrent vitreous hemorrhage, a hallmark complication.
Patients commonly present with decreased vision, floaters, or “cobweb-like” visual disturbances, often due to vitreous hemorrhage. On examination, findings include retinal vascular sheathing, hemorrhages, and exudates along affected vessels. More than half of patients have bilateral involvement. Additional findings may include vitreous cells, cystoid macular edema, and neovascularization of the retina or optic disc, which can progress to neovascular glaucoma if untreated.
Diagnosis relies heavily on fluorescein angiography, which helps identify areas of retinal nonperfusion, vascular leakage, and neovascularization. Optical coherence tomography (OCT) may detect associated macular edema or epiretinal membranes. Since Eales disease is a diagnosis of exclusion, investigations are necessary to rule out other causes such as diabetes, sickle cell disease, retinal vein occlusion, inflammatory or infectious vasculitis, and systemic autoimmune conditions.
Management focuses on controlling complications. Panretinal photocoagulation (laser therapy) is essential in cases with retinal ischemia and neovascularization to prevent further hemorrhage and tractional complications. Corticosteroids, either systemic or intravitreal, may help reduce inflammation and vascular leakage. Anti-VEGF agents (such as bevacizumab) are sometimes used to induce regression of neovascularization. In advanced cases with persistent vitreous hemorrhage or tractional retinal detachment, vitrectomy surgery may be required.
Patients require regular follow-up every 3 to 12 months, depending on disease severity, to monitor for progression and complications. Education is important—patients should be aware of symptoms such as sudden floaters or vision loss, which may indicate vitreous hemorrhage.
The prognosis is generally favorable with appropriate management, with many patients maintaining visual acuity of 20/40 or better. However, complications such as recurrent vitreous hemorrhage, retinal detachment, and neovascular glaucoma can significantly impact vision if not treated promptly.
Eales disease is an idiopathic obliterative retinal vasculopathy that primarily affects young adults, classically presenting with a triad of retinal phlebitis, peripheral retinal nonperfusion, and recurrent vitreous hemorrhage. It is considered a diagnosis of exclusion, meaning other causes of retinal vasculitis must be ruled out before confirming the condition.
The disease is most commonly reported in regions such as India and the Middle East, typically affecting individuals between 20 and 30 years of age. Earlier studies suggested a male predominance, but more recent data indicate a more equal gender distribution. A possible association with hypersensitivity to tuberculin protein has been proposed, and tubercle bacilli have occasionally been identified in pathological specimens, although the exact cause remains unclear.
Pathophysiologically, Eales disease involves a nonspecific inflammatory occlusive vasculitis, primarily affecting retinal veins. This leads to vascular inflammation (phlebitis), followed by capillary closure and ischemia, which in turn stimulates retinal neovascularization. These fragile new vessels are prone to bleeding, resulting in recurrent vitreous hemorrhage, a hallmark complication.
Patients commonly present with decreased vision, floaters, or “cobweb-like” visual disturbances, often due to vitreous hemorrhage. On examination, findings include retinal vascular sheathing, hemorrhages, and exudates along affected vessels. More than half of patients have bilateral involvement. Additional findings may include vitreous cells, cystoid macular edema, and neovascularization of the retina or optic disc, which can progress to neovascular glaucoma if untreated.
Diagnosis relies heavily on fluorescein angiography, which helps identify areas of retinal nonperfusion, vascular leakage, and neovascularization. Optical coherence tomography (OCT) may detect associated macular edema or epiretinal membranes. Since Eales disease is a diagnosis of exclusion, investigations are necessary to rule out other causes such as diabetes, sickle cell disease, retinal vein occlusion, inflammatory or infectious vasculitis, and systemic autoimmune conditions.
Management focuses on controlling complications. Panretinal photocoagulation (laser therapy) is essential in cases with retinal ischemia and neovascularization to prevent further hemorrhage and tractional complications. Corticosteroids, either systemic or intravitreal, may help reduce inflammation and vascular leakage. Anti-VEGF agents (such as bevacizumab) are sometimes used to induce regression of neovascularization. In advanced cases with persistent vitreous hemorrhage or tractional retinal detachment, vitrectomy surgery may be required.
Patients require regular follow-up every 3 to 12 months, depending on disease severity, to monitor for progression and complications. Education is important—patients should be aware of symptoms such as sudden floaters or vision loss, which may indicate vitreous hemorrhage.
The prognosis is generally favorable with appropriate management, with many patients maintaining visual acuity of 20/40 or better. However, complications such as recurrent vitreous hemorrhage, retinal detachment, and neovascular glaucoma can significantly impact vision if not treated promptly.
