A 10-day-old baby girl is noticed by her grandmother to have a ‘white shine’ in the right eye in photographs. The right pupil looks white; the left looks normally dark. The baby was born full term and is otherwise healthy. The parents are told the lens in the right eye is completely white and are terrified by the word ‘operation’ on a ten-day-old infant. They ask whether it can wait ‘until she is bigger and stronger’.
Examination Findings
A 10-day-old infant. The right eye shows leukocoria — a white pupillary reflex; the lens is densely white and the red reflex is absent on the right. The left eye has a normal red reflex and a clear lens. The right eye does not fixate or follow; the left eye fixes and follows normally. B-scan ultrasonography of the right eye shows a dense lens with no intraocular mass and a normal posterior segment. The eyes are otherwise normally formed; intraocular pressure is normal. The infant is otherwise healthy and full term.
Investigations
Red reflex testing (the screening test that catches it). B-scan ultrasonography to exclude retinoblastoma and confirm a normal posterior segment. Examination under anaesthesia for biometry, corneal diameter, and intraocular pressure. Paediatric workup per local protocol (unilateral dense cataract is usually isolated; systemic workup as indicated). Urgent paediatric ophthalmology referral — this is measured in days to weeks, not months.
Questions to Think About
- Why can this not wait until she is bigger?
- Why is a one-sided cataract more dangerous to vision than a two-sided one?
- What matters more for the final vision — the operation or what happens after it?
Diagnosis
Unilateral congenital cataract (right eye) — a dense white lens at birth; urgent lensectomy within the first weeks of life with immediate optical correction and amblyopia therapy to rescue vision.
Reasoning
Reasoning: a dense white lens with absent red reflex at ten days of age is a unilateral congenital cataract, and the absent fixation with the right eye already signals deprivation. The visual system learns to see in the first weeks of life; a dense cataract deprives the retina of formed images, and in unilateral disease the normal eye actively suppresses the deprived one — which is why unilateral cataract carries a worse prognosis than bilateral and demands the earliest surgery. Waiting ‘until she is bigger’ trades surgical convenience for permanent vision loss. Diagnosis: dense unilateral congenital cataract, right eye. Management: typical management is urgent lensectomy within weeks, immediate contact-lens correction of the resulting aphakia, and rigorous patching of the good eye — with honest counselling that the operation opens the door but compliance with the lens and patching walks through it, and that long-term glaucoma surveillance follows.
Differential Diagnosis
- Bilateral congenital cataract — ruled out: the left eye is completely normal; the urgency and the optical plan differ for unilateral disease.
- Persistent fetal vasculature — ruled out: no stalk or elongated ciliary processes on examination; the lens opacity is isolated.
- Retinoblastoma — ruled out: B-scan shows no mass, only a dense lens; but leukocoria always demands this exclusion.
- Corneal opacity — ruled out: the cornea is clear; the white reflex comes from the lens.
Management
Urgent referral to a paediatric ophthalmologist: typical management is lensectomy with anterior vitrectomy within the first weeks of life, immediate aphakic contact lens fitting, and aggressive occlusion therapy of the normal eye. Long-term follow-up for glaucoma (a known post-lensectomy risk), refractive changes, and amblyopia. Family counselling on the guarded prognosis and the critical importance of contact-lens wear and patching compliance.
Key Learning Points
- A unilateral dense congenital cataract is an emergency of visual development: every week of deprivation deepens the amblyopia.
- Unilateral cataract has a worse prognosis than bilateral — the good eye outcompetes the deprived eye, so surgery must be earlier and amblyopia therapy more aggressive.
- Surgery (lensectomy with anterior vitrectomy in infants) is only step one — immediate optical correction (contact lens or, later, secondary IOL) and patching of the good eye determine the outcome.
- Leukocoria always demands retinoblastoma exclusion first — B-scan is part of the urgent workup.
- Parents need honest counselling: even with perfect timing, the unilateral eye often ends with reduced acuity; the goal is the best possible vision, not normal vision.
Red Flags
- Leukocoria — retinoblastoma must be excluded urgently in every case; never assume cataract.
- Delay measured in months — deprivation amblyopia becomes irreversible; the window is weeks.
- Contact lens abandonment after surgery — the operated eye stays blurred and amblyopia wins.
- Post-lensectomy glaucoma — lifelong pressure surveillance is part of the package.
Educational content only — not medical advice. Clinical decisions must be made by a qualified professional for the individual patient.