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.

The white pupil (leukocoria): urgent assessment

Leukocoria is a white pupillary reflex that can signal sight-threatening and life-threatening disease [S9]. Retinoblastoma, the most common intraocular tumour of childhood, most often presents with leukocoria [S3] [S7]. Survival exceeds 95% when retinoblastoma is diagnosed early and treated in specialist centres, but falls below 50% once the tumour has spread outside the eye [S3]; any abnormal red reflex warrants immediate evaluation by an ophthalmologist [S9].

Key points - Treat every white pupil as possible retinoblastoma until an ophthalmologist has examined the eye [S9] [S2]. - Retinoblastoma survival is about 40% in low-income countries compared with about 90% in developed countries, mainly because of delayed diagnosis [S6] [S11]. - Caregivers can see leukocoria as a glowing white "cat eye reflex" at night or in photographs [S4]; primary health workers can detect it with red reflex and Hirschberg tests during immunisation and well-baby visits in the first 24 months [S4]. - Diagnosis is usually by fundus examination and ultrasound; MRI is preferred for staging and CT is no longer recommended [S1] [S7]. - Early diagnosis, fast referral pathways and programmes to prevent treatment abandonment are recommended for low- and middle-income countries rather than universal screening [S11].

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

Red flags

• Any white, absent or otherwise abnormal red reflex [S9] [S2].
• Leukocoria with a squint: squint is the second most common presentation of retinoblastoma [S3] [S2].
• Proptosis: with leukocoria, the most common presenting feature of retinoblastoma in Asian Indian populations [S7], and a sign of advanced disease [S11].
• Family history of retinoblastoma: heritable retinoblastoma accounts for 45% of cases, 80% of them bilateral [S3].
• Painful red eye in a child with known leukocoria: severe Coats disease can lead to a painful red eye [S10].

Recognise it: causes of a white pupil

• Retinal: retinoblastoma, Coats disease, retinopathy of prematurity, familial exudative vitreoretinopathy, myelinated nerve fibres, ocular toxocariasis and toxoplasmosis, retinochoroidal coloboma, and hamartomas [S9].
• Vitreous: persistent fetal vasculature [S9] [S8].
• Lens: cataract [S9].
• Anterior segment and cornea: anterior segment dysgenesis, congenital glaucoma, birth trauma [S9].
• Retinoblastoma typically presents before the age of 5 years in over 90% of cases [S4]; incidence is 1 in 16,000-28,000 live births worldwide [S6].
• Coats disease mainly affects young males, often in one eye, and progresses to reduced vision, strabismus and leukocoria, typically in the first decade [S10].

Confirm it

• Red reflex test with a direct ophthalmoscope [S9]; absence of the red reflex is an indication for urgent ophthalmology assessment [S2].
• Ophthalmic examination: retinoblastoma is usually diagnosed by fundus examination followed by ultrasound [S7] [S1]. Biopsy is usually not required for diagnosis or treatment decisions [S4].
• Imaging: high-resolution MRI is important for confirming diagnosis, local extent, and associated brain abnormalities or intracranial tumour (trilateral retinoblastoma); CT is no longer recommended because of radiation exposure, particularly in hereditary disease [S1] [S2].
• Other causes: fluorescein angiography and OCT help in Coats disease [S10].

Manage it

Before acting on this section, check the national and local guidelines, product information and regulatory approvals that apply where you practise. See the medical disclaimer.

Tier A (primary care / no specialist)

1. Examine the red reflex at newborn, immunisation and well-baby visits [S4] [S9].
2. Take parents' concerns seriously when they report a white glow in photographs [S4]. An antenatal information pamphlet made parents less likely to delay seeking help for leukocoria in an RCT of 518 pregnant women [S5].
3. Refer immediately to an ophthalmologist; do not wait for a review appointment [S9] [S2].
4. Smartphone and AI tools: machine learning models had a pooled sensitivity of 0.972 for retinoblastoma and leukocoria detection, but specificity was limited and studies were small and biased [S12]; their real-world usefulness is uncertain [S11]. They do not replace examination.

Tier B (general eye clinic)

• Examine both eyes with dilated fundoscopy and ultrasound where available [S7].
• Arrange urgent transfer to a retinoblastoma centre when a tumour is suspected; ensuring patients reach centres of excellence promptly and minimising treatment abandonment are essential in low- and middle-income countries [S11].
• Avoid CT where MRI is possible [S1] [S2].

Tier C (specialist centre)

• Retinoblastoma: management by a multidisciplinary team (ocular oncology, medical and radiation oncology, genetics, nursing, social work) [S3]; staging may include bone marrow sampling, lumbar puncture and MRI [S2]. Treatment options include enucleation, chemotherapy by intravenous, intravitreal, periocular and intra-arterial routes, laser, cryotherapy and brachytherapy [S4]. Genetic testing and counselling inform family screening [S7].
• Coats disease: options include anti-VEGF agents, steroids, laser, cryotherapy and vitrectomy; outcome depends on stage at presentation [S10].
• Persistent fetal vasculature: surgical indications and techniques are evolving [S8].
• Drug doses are not covered by these abstracts: follow local protocols.

Refer when

Pitfalls

• Reassuring parents without examining the eye [S4] [S9].
• Relying on a normal undilated red reflex or a smartphone app to exclude disease [S11] [S12].
• Ordering CT instead of MRI [S1].
• Referring without making sure the child arrives and stays in treatment [S11].

Evidence notes

• Thin evidence: apart from one RCT on parent education [S5] and one diagnostic meta-analysis [S12], the sources are reviews and consensus statements; no trials address referral pathways for leukocoria.
• The RCT measured hypothetical help-seeking intention, not actual diagnosis [S5].
• Incidence figures differ slightly between sources (1:16,000-1:18,000 [S4] vs 1 in 16,000-28,000 [S6]).
• Not covered by these sources: frequency of each cause of leukocoria, retinoblastoma screening schedules for at-risk families, and chemotherapy regimens.

Related articles

• Retinoblastoma
• Paediatric cataract
• Retinopathy of prematurity

References

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