Author: Claude (AI), from PubMed abstracts · Reviewed by: Dr Mina Abdelmseih · Reviewed: 2026-11-15 · Review due: 2027-11-15

Educational content only. Not personalised medical advice. Clinical decisions remain the responsibility of the treating clinician.

Paediatric cataract

Cataract is the leading cause of childhood blindness in developing countries [S7]. Infantile cataract is one of the most treatable causes of lifelong visual impairment, but outcomes depend on early detection, timely surgery and years of refractive correction and amblyopia therapy [S6] [S8] [S11].

Key points - Examining all newborns with the red reflex test for congenital cataract and retinoblastoma is widely accepted, although supporting evidence is limited [S5]. - Late presentation, often from missed screening, causes deprivation amblyopia and irreversible visual loss [S11] [S12]. - An American Academy of Ophthalmology (AAO) assessment does not recommend IOL implantation at 6 months of age or younger, because visual axis opacities are more frequent than with aphakia; IOLs can be implanted safely after 6 months [S3]. - Visual axis opacification, glaucoma and amblyopia are the three most common complications; glaucoma develops long term in about a third of infants operated on [S6] [S11]. - Children from socioeconomically marginalised backgrounds have more delays and poorer adherence to amblyopia therapy, with worse outcomes [S8].

Evidence last checked: 2026-10-17 (PubMed abstracts).

Red flags

• Absent or abnormal red reflex, or leukocoria, in a baby or child [S5] [S7].
• Strabismus or nystagmus with a lens opacity: absence of nystagmus or strabismus predicts better outcomes, so their presence signals urgency and a worse prognosis [S6].
• Raised pressure, enlarging cornea or watering after childhood cataract surgery: glaucoma can appear years later [S1] [S6].
• Missed follow-up visits: late complications can occur decades later [S1].

Recognise it

• Parents often bring children after noticing strabismus or leukocoria; many cases are found at routine checks, and the red reflex is absent on direct ophthalmoscopy [S7].
• Causes include genetic disorders, infections, metabolic diseases and trauma; about one-fourth of congenital cataracts are hereditary [S7] [S12].
• Cataract may occur with systemic disease, microphthalmia, microcornea or aniridia [S7].
• Persistent fetal vasculature and trauma are specific associated conditions [S11].

Confirm it

• In young babies the cataract type is determined by slit-lamp examination and examination under anaesthesia [S7].
• Cataract morphology can indicate the cause, guide surgery and inform prognosis [S6]; modern genetic tests can define the underlying aetiology [S11].
• Accurate biometry (axial length and keratometry) is essential before IOL implantation [S10].

Manage it

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Tier A (primary care / no specialist)

• Check the red reflex in every newborn and at child health visits [S5].
• Refer any abnormal red reflex, leukocoria or new squint in an infant the same day or within days (see Refer when) [S5] [S7].
• Explain to families that treatment continues for years after surgery; parental stress and health literacy affect outcomes [S8].

Tier B (general eye clinic)

• Confirm the opacity and refer to a paediatric cataract team; do not wait for the child to be older [S11] [S12].
• Support the long-term pathway after surgery: refractive correction and amblyopia therapy are critical, even months to years after cataract removal [S8]. The quality of orthoptic-refractive aftercare is the essential predictor of a good functional outcome [S4].
• Monitor for glaucoma, visual axis opacification and inflammation at every visit [S1] [S11].

Tier C (specialist centre)

1. Timing. Many studies show the benefits of early surgery for infantile cataract [S6]; treatment must fall in the developmental window of the eye and visual pathway [S4].
2. Optical correction in children 2 years or younger. IOLs gave visual outcomes similar to contact lenses or spectacles but more visual axis opacities, lower endothelial counts and, in infants under 6 months, large myopic shifts [S3]. Glaucoma and strabismus rates were similar across treatments [S3]. Contact lenses may be preferred under 6 months where available and practical [S6].
3. IOL power. Formulas developed for adults give varying errors in children; Barrett Universal II and Kane appear more accurate than older formulas such as SRK/T. Undercorrection allows for myopic shift, but there is no consensus on formula or target refraction [S10]. Children may later need an IOL exchange or a large spectacle or contact lens correction [S3].
4. Unilateral cataract. Only about 50% of eyes with unilateral infantile cataract reach better than 20/200; amblyopia therapy must continue until at least 8 years of age, but compliance was less than 30% of prescribed time [S2].
5. Bilateral cataract. Contact lenses, IOLs or aphakic glasses can be used; outcomes are typically excellent unless glaucoma develops, which occurs in up to 30% [S2].
6. Complications differ from adults, with stronger inflammation, posterior capsule opacification, lens reproliferation, pupillary membranes and, in infants, glaucoma [S1].

Refer when

Pitfalls

• Skipping the newborn red reflex check [S5].
• Treating surgery as the end of care; aftercare quality predicts the outcome [S4].
• Implanting an IOL in infants 6 months or younger without weighing the higher opacification rate [S3].
• Using adult target refractions in a growing eye [S10].
• Discharging children from follow-up; glaucoma can occur late [S1] [S6].

Evidence notes

• Thin evidence. The triage sheet for this topic contained no randomised trials or meta-analyses; only the AAO assessment [S3] grades evidence. Findings from the Infant Aphakia Treatment Study and the Toddler Aphakia and Pseudophakia Study are referred to only indirectly through [S9].
• Reviews agree on early detection, early surgery and long-term amblyopia therapy, but differ on IOLs before 6 months: [S3] advises against, while [S6] notes good outcomes are possible and contact lenses may be preferred.
• Prevalence data from low-income countries are hard to determine [S6].
• Not covered by these sources: exact surgical timing in weeks, surgical technique (posterior capsulotomy, anterior vitrectomy), perioperative drug doses, and traumatic cataract management.

Related articles

• The white pupil (leukocoria): urgent assessment
• Amblyopia: patching, atropine and binocular treatment
• Childhood Glaucoma

References

See the numbered source list below. Each marker [S#] links to its PubMed and DOI record.