Eye screening or full eye exam: what a child's screening can find

Your child has had an eye screening, or is about to. Some parents hear "screening" and assume nobody really looked. Others hear "passed" and stop thinking about their child's eyes for years. Both are a little off. This page is for the child aged 4 to 12: what a screening checks, what it leaves out, and what happens when it says "refer".

Is an eye screening the same as a full eye exam?

No. A screening asks one question: does this child need a closer look? A full eye exam asks another: what is going on, and what does it need? The American Academy of Ophthalmology (AAO) calls a screening a more efficient check that sends a child on for a full exam if needed. The full exam is the one that diagnoses eye disease, and it uses drops to open the pupil for a fuller view inside the eye.

The AAO and the American Association for Pediatric Ophthalmology and Strabismus (AAPOS) put the order in a joint statement. Children are screened routinely, again every one to two years after five, and a child who does not pass is sent for a full exam. The same statement says routine full exams on children with no symptoms have no proven medical benefit. That is no argument against eye care: it is a quick sieve for everyone and a thorough look for the child the sieve catches. The sieve exists because a child with one weaker eye often has no symptoms: the Royal College of Ophthalmologists notes the child may not know what they should be able to see. A child with symptoms, or a family history of squint, lazy eye or childhood cataract or glaucoma, need not wait for a screening to ask. For a child who has never had an eye test, a first eye test before school covers why earlier is better. How we test eyes before a child can read shows what the full exam looks like.

What does a children's eye screening check at ages 4 to 12?

Mostly how sharply each eye sees, one eye at a time on a chart, plus a look at whether the eyes line up. A child does not need to know letters: the NHS test at 4 to 5 is a matching game with one eye covered, and pictures or shapes can stand in. For a child of 5 or over, the AAPOS list also includes the eyelids, eye movements, pupils and red reflex.

Each programme sets its own pass line. AAPOS refers a child of 5 or over who cannot read the 20/32 line with either eye (at age 4 the line is 20/40); Malaysia's school health team uses its own cut-off, set out in when your child's eyes are checked in Malaysia. Some programmes add a camera or small instrument that estimates the eye's focusing without the child answering. The Malaysian school health procedure also lists a turned eye (juling), a drooping eyelid and colour vision, tested separately on Ishihara plates.

How long does a children's eye screening take?

A few minutes for each child on a chart test, as the British and Irish Orthoptic Society says of its test for 4 to 5 year olds. A full exam is a different morning. The drops need 30 to 60 minutes to work, and one US children's hospital tells new patients to expect up to three hours.

That gap is a clue. If an eye doctor runs the screening, I would ask how long to set aside. "A few minutes" means a screening. "Most of the morning" means a full exam, whatever it is called.

Will they put drops in my child's eyes?

Usually not for a screening, and usually yes for a full exam. A chart test needs no drops, and camera or instrument screens read the eye as it is. A full exam differs because a child's focusing muscle can hide long-sightedness. AAPOS says doctors relax it with drops to check whether a child needs glasses, and the drops also let them see the inside of the eye.

The drops sting for a few moments. Light sensitivity and blurred near vision are the usual effects afterwards, and AAPOS says the blur usually lasts 4 to 24 hours, depending on the drop. If an eye doctor does the screening, ask beforehand whether drops are part of it. The long version is in about those eye drops at the clinic.

What does a pass or a refer result mean, and will I get it in writing?

A pass means the check found no sign of reduced vision or misaligned eyes on the day. A refer means your child needs a closer look, which is not the same as something being wrong. A child who cannot be tested counts as a refer too: the AAO advises a full exam when a screening is inconclusive or cannot be done.

A refer is a sieve, and a sieve catches some children who are fine. In a Northern Ireland study, 79 children in their first year of school failed the chart test, and 41 of them had no squint or significant focusing error on full testing, by the study's strict definition. The US Preventive Services Task Force notes the same pattern: false positives are most common where eye problems are rare. I would treat a refer as a reason for a full exam, not for dread.

On the written result, the AAO and AAPOS say a good programme has a way to tell parents the result and to make sure follow-up happens. The NHS school programme sends a letter either way. In Malaysia each reading goes into the child's health record, and a child who falls short takes home a referral letter with the reading in each eye, a line to see an optometrist and a reply slip. The school vision letter explained goes through it. For any other screening, ask before the day whether you will get the result in writing.

What can an eye screening not find?

Eye disease inside the eye, and some focusing problems, mainly long-sightedness. A screening does not look inside the eye through a dilated pupil, and it is not built to diagnose. The NHS leaflet itself says screening is not perfect and may not find every child with reduced vision.

The Northern Ireland study counted the other side too. Of 205 children who passed, 16 (7.8%, about 1 in 13) had a squint or a significant focusing error on full testing, and most were long-sighted. A distance chart finds short-sightedness better than long-sightedness, because only some long-sighted children see the distance line badly. A US expert group adds that some instruments miss it as well. Long-sightedness: glasses for a child who sees fine explains why.

A pass is also a result for one day. Children rarely complain, and the NHS leaflet reminds parents that vision changes over time. If your child says the board is blurry, sits close to the screen, squints or covers one eye, believe the child, whatever the screening said. How to tell if your child needs glasses lists the signs by age.

What happens after a refer, and does the next step cost anything?

A full eye exam, ideally by someone trained to examine children. The AAO and AAPOS say a child who does not pass should be referred to a primary care provider or an eye care provider with training and experience in treating children. In Malaysia the school letter names an optometrist, and an eye doctor is the door for a turning eye, vision that will not correct, or anything about the eye itself. Who can check my child's eyes in Malaysia sets out the doors. The exam measures each eye, checks alignment, and uses drops to find the true glasses power and look inside. It ends in one of three places: all clear, glasses, or something to treat or follow, such as a lazy eye.

In a school-age child the finding is often short-sightedness, the commonest refractive error at this age. If so, the next step is a myopia check: the power measured, with drops where needed, a note of how fast it is changing, and a plan with regular reviews, at least every six months for a child on any myopia-control treatment, says the international myopia guideline. The treatments shown in studies to slow the change are low-dose atropine drops, myopia-control spectacle lenses and myopia-control contact lenses, including overnight lenses (ortho-k). Time outdoors matters most before short-sightedness starts, and slowing myopia down sets out what each can and cannot do.

Does the next step cost anything? It depends on where you go and what is done, so ask before you book: what the full exam includes, whether drops and extra tests are priced separately, and what glasses would add. A referral is advice, and where you go next is your decision. I cannot give a figure here, because it varies from place to place.

Common questions

References

1. AAO and AAPOS · Vision screening for infants and children, joint statement 2022 · www.aao.org
2. American Academy of Ophthalmology · Eye screening for children · www.aao.org
3. AAPOS · Vision screening recommendations · aapos.org
4. AAPOS · Dilating eye drops · aapos.org
5. US Preventive Services Task Force · Vision in children ages 6 months to 5 years: screening, 2017 · www.uspreventiveservicestaskforce.org
6. NHS · Eye tests for children · www.nhs.uk
7. NHS England · Vision screening for 4 to 5 year olds: information for parents · assets.publishing.service.gov.uk
8. British and Irish Orthoptic Society · Children's vision screening · orthoptics.org.uk
9. Royal College of Ophthalmologists · Orthoptist-led vision screening for children, statement 2016 · curriculum.rcophth.ac.uk
10. McCullough and Saunders · Visual profile of children who passed or failed the UK school vision screening protocol, Br Ir Orthopt J 2019 · pmc.ncbi.nlm.nih.gov
11. Mavi et al. · Hyperopia: a practical introduction, Community Eye Health Journal 2024 · pmc.ncbi.nlm.nih.gov
12. Pang et al., National Center for Children's Vision and Eye Health · Recommended practices for vision screening in pre-school-age children: a 2025 update, Optom Vis Sci 2025 · pmc.ncbi.nlm.nih.gov
13. Kementerian Kesihatan Malaysia · Prosedur Operasi Piawai Perkhidmatan Kesihatan Sekolah (2013) · hq.moh.gov.my
14. Gifford et al. · IMI Clinical Management Guidelines Report, Invest Ophthalmol Vis Sci 2019 · pubmed.ncbi.nlm.nih.gov
15. Lurie Children's Hospital of Chicago · How to prepare for an ophthalmology visit and what to expect · www.luriechildrens.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.