Life after retinoblastoma: my patients are teenagers now

There is a particular silence that falls in a consultation room when the word cancer arrives, and in twenty years I have never found a way to stop it. What I have found is what best interrupts it, and it is not a statistic, although I will give you the statistics too. It is the honest answer to the question underneath the silence, the one parents are often too frightened to ask out loud: what will my child's life be? This article is that answer, as I have watched it play out. Awareness campaigns, including the gold ribbons of September, are usually built from the frightening half of the story. This is the other half.

Do children survive retinoblastoma?

Most do. In Malaysia we can now say that with our own numbers rather than borrowed ones: a 20-year study of 402 children treated for retinoblastoma across the country, drawn from the national eye database, found survival of 96 in 100 at one year and more than 92 in 100 at five years. When the cancer is in one eye, which is how six out of ten cases present, five-year survival was 93 in 100. In the UK the figure is around 98 in 100. Numbers like these are why doctors talk about retinoblastoma with genuine hope.

The same Malaysian study asked what separated the better outcomes from the worse ones, and the answer should be printed on every awareness poster: delay in diagnosis, and families dropping out of follow-up. Not the sophistication of the treatment. The noticing, and the turning up. Both belong to families, which means the survival statistics of this disease are, to a degree that is rare in medicine, partly written at home.

What happens to the eye after treatment?

Treatment follows a strict order of priorities: the child's life first, then the eye, then as much vision as possible. Depending on the tumour it can involve freezing, laser or heat treatment, chemotherapy delivered in several ways, radiotherapy, and sometimes surgery to remove the eye when that is the safest road. I know how that last option lands when parents first hear it, so let me tell you what it actually means for the child.

A removed eye is replaced with an artificial eye, custom made by a specialist called an ocularist, matched in colour and detail to its partner and shaped to sit over an implant so it moves with the other eye. The result looks and moves so naturally that most people never notice, including, eventually, the child's own classmates. And here is the observation I offer every parent facing this decision: in my experience the person who takes longest to adjust to an artificial eye is almost never the child. It is the adults around them. A three-year-old treats a prosthetic eye the way they treat a plaster, as an administrative detail in a busy life, and gets back to the important work of being three.

Can a child really live a normal life with one eye?

Yes, and I mean an unremarkable, full-sized life, not a bravely reduced one. The brain adapts to judging distance with one eye, using the dozens of depth cues that never needed two eyes in the first place, and children who lose an eye young adapt fastest of all. Reading, school, music, swimming, cycling, most sports: all open.

Two rules guard that life, and they are worth engraving. First, the seeing eye is now the only eye, so it gets protected like the treasure it is: proper protective glasses with shatter-resistant polycarbonate lenses for sport, every time, even when the vision in that eye is perfect. The professional guidance for athletes with one seeing eye is unambiguous on this, and it names the two exceptions that are simply out: boxing and full-contact martial arts, because no effective eye protection can be worn for them. Second, the seeing eye gets regular checks for life, so that anything that ever threatens it, even ordinary things like a growing child's need for glasses, is caught early and treated well.

What my patients are doing now

The children I helped look after in my earlier years at the hospital are teenagers now, and their follow-up appointments have become some of my favourite clinics of the year, mostly because of how boring they are. They arrive annoyed about traffic and homework. They sit exams. They argue with their parents about phones, and their parents, who once sat in the silence I described at the start, now complain to me about screen time like every other family in the waiting room, which I consider a triumph.

One of them plays in a school band, and practises, according to a long-suffering parent, rather more loudly than necessary. One spends weekends at a stable and rides with a confidence I will never have around horses. And one wrote a book about what surviving retinoblastoma felt like from the inside, which taught me things about my own clinic that no amount of time on my side of the desk ever could. I keep it within reach for the days when a new family needs to know what the far side of this story looks like.

I tell you these things with their families' blessing and with every identifying detail removed, because the point is not who they are. The point is what they have in common: every one of those stories began with an adult noticing something small, early, and acting on it inside weeks rather than months.

What does follow-up look like, and why does it matter so much?

Follow-up after retinoblastoma is dense at the start and relaxes with time. In the heritable form, where the child carries a change in the RB1 gene, new tumours can still form for a few years after treatment, so examinations are frequent early on, and the care team also keeps a watch beyond the eyes. Where the heritable form is confirmed, family members can be tested for the gene change, and young children in the family are examined from early in life rather than waiting for anything to show, the same logic behind bringing any higher-risk child for eye checks earlier than the routine schedule.

I have already told you why this section is not optional reading: in the Malaysian 20-year data, dropping out of follow-up was one of the two factors most strongly associated with worse survival. I understand every reason it happens. The child looks well, the hospital is far, the appointment falls on a work day, and after two clear years the visits can feel like a formality. They are not a formality. They are the treatment, continued by other means, and the families who treat the appointment card that way are giving their child the best long-term outlook this disease allows.

What should I do tonight?

If your child has never shown any of the signs, the ten-second check is all September asks of you: open your camera roll, find a few flash photos, and look at the pupils. A red or dark glow is a healthy retina announcing itself. A white glow that keeps appearing in the same eye, across different photos and different light, earns an appointment this week, and the white glow article walks you through exactly how to read what you find without losing a night's sleep over one odd frame. The other signs worth acting on, a new squint, a changed iris colour, a swollen or persistently painful red eye, are covered in the companion article on eye cancer in children.

And if your family is somewhere in the middle of this story right now, newly diagnosed, mid-treatment, staring at the silence I described at the start, then what I most want you to take from this page is the shape of the road ahead. It bends. The teenagers in my clinic are not exceptions or miracles. They are what the Malaysian numbers look like when they grow up, and the two things that put them there, noticing early and turning up, are the two things every family can do.

Common questions

References

1. Nor-Aizura Z et al. · Survival probabilities of retinoblastoma patients in Malaysia: a 20-year retrospective cohort study, Korean Journal of Ophthalmology (2026) · europepmc.org
2. Ain-Nasyrah AS et al. · The survival outcomes of unilateral retinoblastoma in Malaysia, Medical Journal of Malaysia (2025) · europepmc.org
3. American Cancer Society · Living as a retinoblastoma survivor · www.cancer.org
4. NHS · Retinoblastoma, treatment · www.nhs.uk
5. National Cancer Institute · Retinoblastoma treatment (PDQ), patient version · www.cancer.gov
6. American Academy of Ophthalmology · Protective eyewear for young athletes · www.aao.org

By Dr Chan Li Yen. General information only. It does not replace a consultation. If you are worried about your child's eyes or vision, please see an eye doctor.