A 6-week-old infant is brought by worried parents who noticed a white colour in both pupils in photographs and in dim light. The baby does not seem to look at faces. The pregnancy was normal and there is no family history of eye disease. The parents were told at a local clinic that ‘the lenses look cloudy’ and referred onwards.
Examination Findings
A white pupillary reflex (leukocoria) is visible in both eyes in room light. The infant does not fix or follow a light with either eye. Slit-lamp (handheld) examination shows dense white lens opacities filling both pupils. Corneas are clear and normal in size. Pupils react sluggishly. B-scan ultrasound (lens opacity blocks the fundus view) shows flat retinas with no mass lesion. The infant is otherwise healthy; the mother reports an unremarkable pregnancy.
Investigations
Dilated examination under specialist care; B-scan ultrasound to exclude an intraocular mass when the fundus cannot be seen (critical: never assume a white reflex is ‘just cataract’). Systemic workup for bilateral disease: TORCH screen, metabolic review, and paediatric assessment. Urgent referral to a paediatric ophthalmologist — same week.
Questions to Think About
- Why is leukocoria in an infant treated as an emergency, and what must be excluded first?
- Why can cataract surgery not wait a few months ‘until the baby is bigger’?
- After successful surgery, why might the child still have poor vision without further treatment?
Diagnosis
Bilateral dense congenital cataract with leukocoria — urgent surgical indication.
Reasoning
Reasoning: A white pupillary reflex in a 6-week-old with dense lens opacities and no fix-and-follow behaviour is bilateral congenital cataract — but the first duty is to exclude retinoblastoma, the life-threatening mimic. Because the cataract blocks the fundus view, B-scan ultrasound is essential: a flat retina with no mass supports cataract. The urgency is neurological, not just optical: the visual cortex develops through clear retinal images in the first weeks of life, and dense bilateral deprivation rapidly causes irreversible stimulus-deprivation amblyopia. Surgery is typically undertaken within weeks of birth for dense bilateral cataracts. Diagnosis: bilateral dense congenital cataract. Management: typical management is urgent cataract extraction by a paediatric ophthalmologist (lens aspiration with posterior capsulotomy and anterior vitrectomy; intraocular lenses are usually deferred in very young infants). Immediately after surgery the eyes are aphakic — high-plus contact lenses (or spectacles) provide the optical correction, fitted promptly because every uncorrected day is amblyogenic. Then comes years of amblyopia therapy with patching and close refractive follow-up. Bilateral disease triggers a systemic workup: TORCH infections (especially rubella), metabolic disorders such as galactosaemia, and genetic counselling. Lifelong surveillance follows for aphakic/pseudophakic glaucoma and retinal detachment. Parents are counselled that surgery restores the pathway but rehabilitation builds the vision — compliance with contact lenses and patching is the decisive factor.
Differential Diagnosis
- Retinoblastoma — the critical rule-out for any leukocoria: urgent dilated examination and imaging distinguish cataract (lens opacity) from an intraocular mass; both present with white reflex.
- Persistent hyperplastic primary vitreous — considered in unilateral cases with microphthalmia; here bilateral dense lens opacities favour cataract.
- Congenital glaucoma — ruled out: corneas are clear and normal-sized, no buphthalmos or tearing.
- Intrauterine infection (rubella) — a cause, not a differential: bilateral cataract prompts systemic workup including TORCH screening.
Management
Urgent bilateral cataract surgery by a paediatric ophthalmologist; immediate aphakic optical correction (contact lenses); aggressive amblyopia therapy; systemic workup; lifelong follow-up for glaucoma and retinal complications.
Key Learning Points
- Leukocoria in an infant is retinoblastoma until proven otherwise — B-scan excludes a mass when the fundus view is blocked.
- Dense bilateral congenital cataract is a surgical emergency: every week of visual deprivation deepens irreversible amblyopia.
- Surgery is only the start — aphakic correction (usually contact lenses) and years of amblyopia therapy determine the outcome.
- Bilateral cases need a systemic workup (infections, metabolic, genetic) — the eyes are a window to the child’s health.
- Parents need honest counselling: early surgery gives the best chance, but visual outcomes vary and follow-up is lifelong.
Red Flags
- Leukocoria — urgent same-week paediatric ophthalmology referral, always.
- Unilateral leukocoria with microphthalmia — consider persistent hyperplastic primary vitreous; do not delay referral.
- Red reflex asymmetry on newborn screening — the earliest catch; every newborn deserves a red reflex check.
Educational content only — not medical advice. Clinical decisions must be made by a qualified professional for the individual patient.