Retinoblastoma symptoms — white pupil reflex

The most common first sign of retinoblastoma is leukocoria — a white or yellowish pupil reflex, sometimes described as a white glow or "cat's eye" appearance, most visible in flash photographs. Instead of the usual red-eye effect seen in photos, one or both pupils appear white or pale. Parents often notice this in family pictures before any other problem becomes obvious. Leukocoria is the presenting sign in the majority of retinoblastoma cases. Any child with a white pupil reflex in a photograph should be evaluated by an ophthalmologist or paediatric oncologist promptly — do not wait for a routine appointment.

Yes. Strabismus — the medical term for a squint or crossed eyes — is the second most common presenting sign of retinoblastoma. When the tumour grows in a part of the retina responsible for sharp central vision (the macula), the eye loses the ability to focus and begins to drift inward or outward. Any new squint in a child, especially if it develops suddenly or in the first few years of life, should prompt a full eye examination including a dilated fundus check to rule out an underlying tumour. Most squints are not caused by cancer, but it is important to exclude retinoblastoma before accepting a purely optical cause.

Retinoblastoma is usually painless in its early stages, which is one reason it can be missed until it has grown significantly. Pain, redness, or swelling of the eye are features of more advanced disease — typically when the tumour has caused raised pressure inside the eye (secondary glaucoma) or has grown large enough to push against surrounding structures. If your child has a red, painful eye along with a white pupil or poor vision, this warrants particularly urgent evaluation. Early retinoblastoma detected through leukocoria in photographs, before the child complains of any pain, generally offers more treatment options.

Retinoblastoma is almost exclusively a disease of young children. Symptoms typically appear between birth and 5 years of age, with the average age at diagnosis being around 18 months for bilateral (both eyes affected) cases and around 2–3 years for unilateral (one eye) cases. Children with a family history of retinoblastoma are usually screened by an ophthalmologist from birth, so their tumours may be detected before any visible symptoms appear. After the age of 6 or 7, new retinoblastoma is very rare. If an older child develops a white pupil reflex, other causes such as Coats' disease or dense cataract are more likely, but specialist evaluation is still needed.

Yes. Retinoblastoma can affect one eye (unilateral) or both eyes (bilateral). Bilateral retinoblastoma is more strongly associated with a heritable genetic change and tends to appear at a younger age. If your child is diagnosed with retinoblastoma in one eye, the other eye is examined carefully and monitored at regular intervals even if it looks healthy at first. Bilateral disease does not automatically mean the outlook is worse, but it does mean both eyes need ongoing attention. Children with the heritable form also have a higher lifetime risk of developing certain other tumours outside the eye, so long-term follow-up with a specialist team is important.

Contact your paediatrician or an ophthalmologist within one to two days — do not wait for a scheduled routine appointment if it is weeks away. Save the photograph that showed the white reflex, as it can help the doctor recreate the examination angle. At the clinic, the doctor will test the red reflex and perform a dilated fundus examination. If a tumour is suspected, the child will likely be referred for an examination under anaesthesia (EUA), an ultrasound of the eye, and an MRI of the orbits. Avoid letting anyone biopsy the eye — this is a recognised risk in retinoblastoma and reputable specialists will not suggest it. At CION, our paediatric oncology team coordinates ophthalmology, imaging, and oncology review from the first consultation so families do not have to navigate multiple referrals alone.