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Ophthalmology – Congenital and Pediatric Cataracts
Congenital and pediatric cataracts refer to any opacity of the crystalline lens present at birth or developing during childhood. These cataracts may occur in isolation or in association with ocular abnormalities or systemic disease. Their morphology is highly variable, including forms such as anterior polar, lamellar, nuclear, posterior lenticonus, cerulean, sutural, and total cataracts.
In approximately 60–70% of cases, a cause can be identified, most commonly genetic. The condition may be unilateral or bilateral and can significantly impact visual development if not detected early.
The incidence in the United States is estimated at 1.2–6 per 10,000 children. Risk factors include intrauterine infections, metabolic disorders, trauma (including birth trauma), steroid exposure, uveitis, genetic syndromes, and family history.
Genetically, the most common inheritance pattern is autosomal dominant with variable penetrance, although autosomal recessive and X-linked forms also occur. Numerous genes have been implicated, reflecting the heterogeneity of this condition.
Pathophysiologically, cataract formation results from disruption of normal lens development or metabolism, leading to loss of transparency. The location and type of opacity often reflect the timing of the insult during fetal development or early life.
Etiologies include:
• Idiopathic (most common)
• Genetic mutations
• Intrauterine infections (e.g., Congenital rubella syndrome, toxoplasmosis, CMV, herpes)
• Metabolic disorders such as Galactosemia
• Chromosomal abnormalities (e.g., trisomy 21)
• Drug exposure (e.g., corticosteroids)
Children often present with leukocoria (white pupillary reflex), which may be noticed by parents directly or in photographs. Other presenting signs include strabismus, nystagmus, or poor visual behavior.
A thorough eye examination is essential. This includes:
• Visual assessment (age-appropriate)
• Cycloplegic refraction
• Slit-lamp examination to characterize the cataract
• Fundus examination (if visible)
If the posterior segment cannot be visualized, B-scan ultrasonography is necessary to rule out serious conditions such as Retinoblastoma, retinal detachment, or persistent fetal vasculature.
Laboratory evaluation is guided by clinical suspicion. In bilateral cases, especially with systemic signs, testing may include TORCH titers and metabolic screening (e.g., for galactosemia). Referral to a geneticist is recommended when a syndromic cause is suspected.
The differential diagnosis of leukocoria is broad and includes conditions such as Coats disease, toxocariasis, and retinal detachment, making accurate diagnosis critical.
Management depends on the size, location, and visual significance of the cataract.
• Small (<3 mm), non-central cataracts may be managed conservatively with observation or pharmacologic dilation and occlusion therapy.
• Visually significant cataracts require early surgical removal to prevent amblyopia.
Surgical treatment typically involves lens aspiration, often combined with posterior capsulotomy and anterior vitrectomy in younger children to prevent visual axis opacification. Intraocular lens (IOL) implantation may be performed, though its use in infants under 1–2 years remains controversial. In these cases, contact lenses are often preferred for optical correction.
Postoperative care is critical and includes:
• Refractive correction (glasses or contact lenses)
• Aggressive amblyopia therapy (patching)
• Regular follow-up to monitor visual development
Prognosis depends on several factors, including age at diagnosis, duration of visual deprivation, cataract density, and presence of associated ocular/systemic disease. Early intervention significantly improves visual outcomes.
Complications include:
• Posterior capsule opacification
• Aphakic or pseudophakic glaucoma (may occur years later)
• Retinal detachment
• Infection (endophthalmitis)
• Amblyopia (most critical long-term risk)
Because of the risk of late-onset glaucoma, lifelong monitoring of intraocular pressure is essential, even years after successful cataract surgery.
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