Medical Oncologist
CION Cancer Clinics
Examination under anaesthesia for retinoblastoma screening | CION Cancer Clinics
Children at inherited risk of retinoblastoma need regular checks of the whole retina, and a toddler cannot keep still enough for that awake. An examination under anaesthesia is a short, planned eye check while the child is briefly asleep. This page explains what the specialist looks at, what happens on the day, and the warning signs that need the eye team the same day. At CION Cancer Clinics, our oncologists plan screening and care for families with an inherited cancer syndrome, explained in plain words.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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On this page
- What is an examination under anaesthesia, and why does my child need one?
- What does the specialist look at while your child is asleep?
- What happens on the day of an EUA?
- Awake examination or examination under anaesthesia?
- What this page cannot tell you
- Four things parents tell us, and what is actually true
- Common questions about EUAs
The short answer
What is an examination under anaesthesia, and why does my child need one?
An examination under anaesthesia, often shortened to EUA, is an eye check done while a young child is briefly asleep under a general anaesthetic. It lets the eye specialist see the whole retina, including its far edges, where the earliest retinoblastomas hide. Children at inherited risk have EUAs regularly in the early years, because an awake toddler cannot keep still enough for a complete check.
Why an awake check is not enough
In the first weeks of life, a baby can usually be examined awake, wrapped snugly. After that, babies become stronger and move constantly. Seeing the very edge of the retina also means gently pressing on the outside of the eye, which no toddler will allow. A tiny tumour at the edge could be missed. A short anaesthetic solves both problems.
Which children need them
Babies who carry the family's RB1 gene fault. Babies whose risk is not yet known, because a parent was never tested or a result is still awaited. Children already treated for retinoblastoma, so treated tumours can be watched and new ones found early. A child whose test shows they did not inherit the family fault does not need them.
An EUA is usually a routine check. Being booked for one does not mean something has been found.During the check
What does the specialist look at while your child is asleep?
An EUA is more than a look. Several things happen in one short sleep, so the child needs as few anaesthetics as possible.
The whole retina, edge to edge
Drops widen the pupils. The specialist wears a headlight and uses a hand lens to look inside, while gently pressing on the eyelid to bring the far edge of the retina into view. Each part of both eyes is checked in turn.
Photographs of the retina
A wide-angle camera records the inside of each eye. The next EUA is compared against these pictures, so even a small change stands out. Parents can often see the images afterwards.
Measurements and scans
The pressure inside the eye and the front of the eye are checked. If anything is seen, an ultrasound or a detailed scan of the retina can be done there and then.
Sometimes added
- Ultrasound of the eye
- A detailed scan of the retina's layers
Treatment in the same sitting
If a small tumour is found, it can often be treated during the same anaesthetic with laser or freezing treatment. This saves the child a second anaesthetic, and treating tumours while they are tiny is what gives the best chance of saving the eye and sight.
Not sure whether this applies to you?
Ask an oncologistOn the day
What happens on the day of an EUA?
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Fasting beforehand
The anaesthetic team will give you exact times to stop food and milk. Breast milk is usually allowed closer to the time than formula or food, and clear drinks closer still. Follow the times exactly, because a full stomach is unsafe under anaesthetic.
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Arrival and drops
Your child is weighed and checked for a cough or cold. Drops go into both eyes to widen the pupils, and take a little while to work.
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Going to sleep
A parent can often stay until the child is asleep. The anaesthetic is usually a gas breathed through a soft mask, and sleep comes within a minute or so.
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The examination
A check on its own is fairly short. It takes longer if photographs, scans or treatment are needed. The anaesthetist watches your child's breathing and heart throughout.
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Waking up and going home
Children often wake up upset or confused, which passes. They can feed once the team allows it. Most go home the same day, and the specialist explains the findings and the next date before you leave.
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One thing that cannot wait
After an EUA, if your child is very hard to wake, is breathing noisily or with effort, keeps vomiting, or will not drink at all, go to the nearest emergency department the same day. Between EUAs, a white glow in the pupil, often seen in a flash photograph, a new squint or a red swollen eye needs a call to the eye team the same day. Do not wait for the next booked check.
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Side by side
Awake examination or examination under anaesthesia?
Awake examination
Examination under anaesthesia
Used in the first weeks of life, and in older children
Used once a baby is too strong to keep still
Baby wrapped snugly, eyelids held gently open
Child fully asleep for a short time
A good view of the centre of the retina
A view of the whole retina, edge to edge
No fasting needed
Fasting needed beforehand
Treatment usually needs another visit
Small tumours can be treated in the same sitting
Being straight with you
What this page cannot tell you
It cannot tell you how often your child needs an EUA, or for how long. That depends on whether your child carries the family's gene fault, on the kind of fault, on your child's age and on what earlier checks found. The eye specialist sets the schedule and changes it as the picture becomes clearer.
It cannot interpret a result
An EUA report uses a detailed map of each eye. What a finding means for your child is for the specialist who did the examination to explain. What your specific gene variant means is a question for the counsellor who ordered the test.
Who this does not apply to
Children with no family history of retinoblastoma do not need screening EUAs. Nor does a child whose test shows they did not inherit the family fault, or an older child who can sit still for a check in clinic. On the question of repeated anaesthetics, studies of short, single anaesthetics in young children have been reassuring. Less is known about many repeated ones. Your team weighs that against the real danger of missing a tumour.
If you are unsure whether your child still needs EUAs, call the helpline. Someone will help you find out where the plan stands.Commonly believed
Four things parents tell us, and what is actually true
"All these anaesthetics will harm my child's brain."
Studies of short anaesthetics in young children have been reassuring. Teams keep each one as brief as possible and combine tests into one sleep. A missed tumour is the far greater risk. Ask the anaesthetist anything that worries you.
"The last EUA was clear, so we can skip the next."
In a child who carries the fault, new tumours can form through the early years. Each check covers only the time since the last one. Skipping a date leaves a gap.
"Pressing on the eye must damage it."
The pressure is gentle and is a standard part of a complete eye examination. The eyes may look a little red afterwards, and this settles quickly.
"Being booked for an EUA means they have found something."
Most EUAs in at-risk children are planned screening checks. They are booked in advance for exactly that reason. A finding is discussed with you on the day.
Questions we are asked
Common questions about EUAs
Why can the doctor not examine my child awake?
Young babies can be, and are, in the first weeks of life. After that, a child moves too much, and checking the edge of the retina needs gentle pressure on the eye that no toddler will accept. An EUA is the only reliable way to see every part of both eyes at that age.
How long will my child be asleep?
For a check on its own, usually a fairly short time. It is longer if photographs, scans or treatment are needed. Expect to spend most of the day at the hospital, including preparation and recovery. The team can give you a better idea once they know what is planned.
How long must my child go without food?
Follow the exact times the anaesthetic team gives you, rather than general advice. Breast milk is usually allowed closer to the anaesthetic than formula or solid food, and clear drinks closer still. If your child eats by mistake, tell the team. It is safer to delay than to go ahead.
Can I stay with my child?
In most hospitals a parent can stay until the child is asleep and join them in recovery as they wake. Bring a favourite toy or blanket, and a feed for afterwards if the team allows it. Your calm voice helps more than anything else.
How often will my child need an EUA?
Most often in the first year, then less often as the child grows, usually until early school age for a child who carries the fault. The schedule is set by the eye team and changes with each result. If a gene test shows the child is not at risk, EUAs stop.
Is an anaesthetic safe for a baby?
Anaesthetics for young children are given by specialist teams, and serious problems are rare. Tell them about any earlier reaction to an anaesthetic, breathing problems, or a recent cough or cold. Ask the anaesthetist your questions before the day. Nothing is too small to raise.
What if my child has a cold on the day?
Call the team before you travel, especially from a district. A mild cold may not stop the EUA, but a chest infection or fever usually means a short delay. If it is postponed, rebook quickly, because the gap between checks matters.
Will my child's vision be blurred afterwards?
Yes, for some hours. The drops keep the pupils wide, so bright light may bother your child and they may be clumsy. This is harmless and wears off by itself. Keep them away from stairs and roads until they are steady.
Your Specialists
Meet CION's oncologists. Bring your family history or genetic report to them.
Our medical oncologists see people with a strong family history of cancer, arrange genetic counselling and testing where it fits, and plan the checks that follow.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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Sources
- GeneReviews (NCBI) — Retinoblastoma
- National Cancer Institute — Retinoblastoma Treatment (PDQ) - Patient Version
- American Cancer Society — Retinoblastoma
- NHS — General anaesthesia
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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