Childhood Cataract, Leukocoria and Congenital Glaucoma

An abnormal red reflex requires a diagnosis

Leukocoria is a white pupillary reflex, not a diagnosis. Cataract, retinoblastoma, persistent fetal vasculature, retinal detachment, Coats disease and other lesions can produce it. Compare reflexes, inspect both eyes and obtain a dilated examination promptly. An intermittent abnormal reflex in a photograph can still merit referral. Do not reassure solely because the child seems to see or because no family member had an eye tumour.

A dense infantile cataract deprives the developing visual pathway of patterned input. Assess laterality, density, size, position, fixation, associated strabismus or nystagmus, and whether there is a usable visual axis. Not every small anterior polar opacity requires surgery, although it may cause refractive error and amblyopia. A unilateral dense central cataract needs an urgent paediatric cataract assessment; delayed treatment can limit vision even after technically successful removal.

Cataract investigation and rehabilitation

Ask about pregnancy infection, metabolic illness, family history and systemic findings. Examine parents when an inherited cataract is suspected. Bilateral cataracts with poor feeding, jaundice or failure to thrive require prompt paediatric evaluation for causes such as galactosaemia; do not order the same broad laboratory panel for every unilateral opacity. Ultrasound can assess a hidden posterior segment, while additional imaging is selected for suspected tumours or complex anomalies.

Persistent fetal vasculature (PFV) reflects failure of regression of fetal ocular vessels and associated tissue. It often affects one smaller eye and can produce a retrolental membrane, elongated ciliary processes, cataract and a stalk toward the disc. Anterior and posterior involvement vary. Retinoblastoma and PFV may both present with leukocoria, so size or a single imaging sign cannot replace full assessment. Surgical planning depends on traction, posterior anatomy and visual potential, with risks from abnormal vascularised tissue.

After cataract removal, prompt optical correction and amblyopia care are essential. Contact lenses can correct unilateral infantile aphakia; spectacles can be useful particularly in bilateral aphakia. IOL choice is age- and anatomy-dependent, and ocular growth changes refraction. The Infant Aphakia Treatment Study compared primary IOL with contact-lens correction in infants with unilateral cataract: it did not establish a visual advantage at one year for primary IOL, and the IOL group had more additional operations. This is a defined trial population, not proof that IOLs should never be implanted in children. See the original randomised study.

A posterior capsulotomy and anterior vitrectomy are often needed in young children to maintain a clear axis; technique depends on age and circumstances. Continue optical adjustment, acuity testing, patching where appropriate and glaucoma surveillance. Glaucoma can develop years after surgery whether the eye is aphakic or pseudophakic. The IATS ten-year analysis reinforces the need for long-term follow-up rather than assuming an IOL removes this risk.

Recognising glaucoma in a growing eye

Childhood glaucoma involves pressure-related injury. In infancy a distensible globe can enlarge, producing buphthalmos, increased corneal diameter and axial length. Corneal oedema can cause photophobia, tearing and blepharospasm. Haab striae are breaks in Descemet membrane, often horizontal or circumferential; they differ from the commonly vertical or oblique breaks of forceps injury. Tearing alone can also arise from congenital nasolacrimal obstruction, so examine corneal clarity and size rather than equating all watery eyes with one disease.

Measure pressure when feasible, interpret the effect of anaesthesia and examine the angle, nerve, refraction, corneal diameter and axial length. A single pressure reading can be misleading. Cupping in infants may partly reverse after control, whereas corneal enlargement and amblyopia can persist. Document growth and structural changes using age-appropriate measurements. Distinguish primary congenital glaucoma from secondary disease associated with aniridia, anterior segment dysgenesis, systemic syndromes, inflammation or cataract surgery.

Treatment and visual development

Primary congenital glaucoma commonly requires angle surgery. Goniotomy needs an adequate view; trabeculotomy can be performed when corneal clarity prevents that view, with conventional or circumferential approaches selected by anatomy and expertise. Medicines may bridge to surgery or supplement it. Refractory disease may require drainage or filtering procedures, while cyclodestruction is selected cautiously. Repeated anaesthesia, scarring, hypotony and tube-related complications matter in a child with decades of expected follow-up.

Parents need a plan for lifelong pressure and visual monitoring, refractive correction and amblyopia management. Drug choice and dosing must account for body size and systemic toxicity. The World Glaucoma Association childhood consensus emphasises individual diagnosis, specialist surgery and optimisation of visual development. In an exam answer, preventing irreversible nerve injury and providing optical rehabilitation are complementary goals.