Atropine drops instead of a patch for lazy eye: how penalisation works
Some children will not keep a patch on, or the skin cannot take it. What the trials found when a drop in the stronger eye did the patch's job, who it suits, the side effects, and what the eye doctor checks along the way.
- Atropine eye drops in the stronger eye can treat lazy eye (amblyopia) when a patch is not working. They blur that eye so the brain has to use the weaker one. It is the same idea as patching, done with a drop.
- In the main trial of 419 children under 7, vision in the lazy eye improved by 3.16 lines with patching and 2.84 lines with atropine at 6 months. The authors called the difference small and clinically inconsequential.
- A Cochrane review of seven trials found atropine as effective as patching, with better adherence, but more light sensitivity and a mild dip in the stronger eye's vision. Patching caused more skin and lid irritation.
- Atropine is a medicine. The drop, the schedule and the length of treatment come from your child's eye doctor, and regular checks look for the stronger eye losing vision (reverse amblyopia).
- Younger children do best. At age 10, the gains were kept, but vision was still short of normal in many, so treatment is worth starting early.
Atropine eye drops can treat lazy eye in place of a patch: the drop blurs the stronger eye so the brain has to use the weaker one, and in the main trial of children under 7 the improvement was close to that of patching. The drops are a prescribed medicine, so the eye doctor decides who gets them and checks both eyes along the way.
This page covers how the method works, what the PEDIG trials and the Cochrane review found, what happened by age 10, who it suits, the side effects, and the follow-up checks. The patch route is covered in why won't my child keep the eye patch on, and the condition itself in the hidden lazy eye.
How do atropine drops treat lazy eye?
They blur the stronger eye on purpose, so the brain has to use the weaker eye and its vision can catch up. This is called penalisation. A patch gets the same result by covering the stronger eye; the drop does it by widening the pupil and softening the near focus of that eye. The American Association for Pediatric Ophthalmology and Strabismus describes it as the alternative to patching, and says the drop temporarily makes the pupil bigger and the vision blurry.
Lazy eye (amblyopia) is not an eye that looks different. It is a weaker eye whose vision did not develop properly, and the stronger eye usually carries the child along without anyone noticing. If you are new to this, lazy eye: how to spot the drift early explains the signs. Glasses are usually sorted first, as the parents' guide to squint and lazy eye sets out, and the drop or patch comes after that.
Does atropine work as well as a patch?
On average, yes, in children under 7 with moderate lazy eye. The PEDIG trial put 419 children aged 3 to under 7 on either patching or atropine. At 6 months the lazy eye had improved by 3.16 lines on the eye chart with patching and 2.84 lines with atropine, a gap the authors called small and clinically inconsequential. Improvement came faster with the patch at first.
A line on the chart is one step down the rows of letters or pictures. Looking at the outcome another way, 79% of the patching group and 74% of the atropine group reached 20/30 or better, or gained 3 or more lines. Both treatments were well tolerated, and parents rated atropine slightly more acceptable on a questionnaire.
The Cochrane review of 2019 pulled together seven trials and 1,177 lazy eyes from six countries. Its authors concluded that atropine is as effective as patching in improving vision, with similar gains reported at every time point, from 5 weeks to 10 years. The trials differed too much in design to combine into one number, so the finding is a pattern across trials, not a single figure.
Is it given every day or only at weekends?
Both schedules have been tested, and in a PEDIG trial they worked the same. Among 168 children under 7 with moderate lazy eye, daily atropine and weekend atropine each gave an average gain of 2.3 lines at 4 months. At the end, 47% of the daily group and 53% of the weekend group had vision of at least 20/25 or as good as the stronger eye.
That is a finding about the trials, not an instruction. How often a drop goes in, which eye, and for how long are decisions for your child's eye doctor, who has measured the vision in both eyes. If the schedule feels confusing, ask for it in writing, and see getting eye drops into a small human for the practical side of getting a drop in.
Who is atropine for, and who is it not for?
It suits children who will not tolerate a patch, whose skin reacts to adhesive, or for whom treatment keeps stalling because the patch comes off. The Cochrane review found better adherence and better quality of life with atropine, and skin, lid or conjunctival irritation more often with patching. It also noted that atropine costs less than conventional patching in the trials it reviewed.
It is not automatically the better choice. Atropine blurs the stronger eye's near vision, which matters for a child doing schoolwork or copying from a book. Some children dislike glare, and some do better with the clear, measurable hours of a patch.
Only the eye doctor can weigh this, and the choice can change. A child who starts on a patch can move to drops, and the reverse. If the trouble is teasing or feeling different, what helps when a child is teased about glasses or a patch may help too.
Does atropine help older children?
It can, with smaller gains. In a PEDIG trial of 193 children aged 7 to 12 with moderate lazy eye, weekend atropine improved vision by an average of 7.6 letters and 2 hours of daily patching by 8.6 letters, and the difference met the definition of equivalent. About 1 in 5 reached 20/25 or better. The full picture for this age group is in lazy eye found late: what treatment can still do.
What are the side effects of atropine for lazy eye?
The common one is light sensitivity, because a wider pupil lets in more light. EyeWiki, the American Academy of Ophthalmology's wiki, lists flushing, a rapid heart rate and mood changes as uncommon effects. The Cochrane review found light sensitivity and a mild fall in the stronger eye's vision more often with atropine, and rated that finding high certainty. The dip did not need treatment.
The one to know by name is reverse amblyopia. If the stronger eye is blurred too much or for too long, its own vision can drop. EyeWiki says this is infrequent and usually mild, and most cases resolve when the treatment is stopped. In the PEDIG trial, more of the atropine children had reduced vision in the stronger eye at 6 months, but this did not persist with further follow-up. This is the reason both eyes are measured at every review.
Atropine is a medicine, so keep the bottle out of reach, as eye drops in the house: keeping children safe explains. Wash hands before and after, and do not let the dropper touch the eye.
What does the doctor check, and what happens in the long run?
Each review measures the vision of both eyes, because the aim is a stronger weak eye without a weaker good one. The doctor checks the stronger eye for any dip, looks at how the eyes line up, since a squint can appear or worsen, and decides when to adjust or stop. Progress is judged over months, not days, and success depends on starting young, keeping the course short and keeping to the plan.
Long-term follow-up of the first PEDIG trial measured 169 children at age 10. Their lazy eyes averaged about 20/32, and 46% had 20/25 or better. Those who started before age 5 did better, and the outcome was the same whether atropine or patching came first. So the gains lasted, but many eyes were still a little behind, which is why an early start is worth it.
Some questions worth taking to the visit:
- Which treatment do you recommend for my child's age and type of lazy eye, and why?
- What will you measure at each review, and when is the next one?
- Which side effects should make me call you, and how do I reach you out of hours?
- If the drops are not going well, can we change to a patch, or the other way round?
The action: ask the eye doctor which treatment suits your child and why, keep every review, and bring the glasses and the drops to each visit. Do not stop, restart or change the drops alone, because the plan rests on the measurements taken at the last visit.
- Says the stronger eye is seeing worse, or you notice it is squinting or turning in a way it was not before.
- Has a flushed face, a racing heartbeat or an unusual change in mood after the drops.
- Has red, itchy or swollen eyelids or skin around the eye.
- Has swallowed the drops, or has been given a double dose by mistake.
- Has sudden eye pain or sudden loss of vision, or seems unwell after a dose: go to an eye casualty the same day.
Common questions
Can atropine drops treat lazy eye instead of a patch?
How do atropine eye drops work for lazy eye?
Is atropine as good as patching for amblyopia?
What are the side effects of atropine drops for lazy eye?
What is reverse amblyopia from atropine?
Can I buy lazy eye drops at the pharmacy and use them myself?
Do lazy eye drops work for older children?
- Archives of Ophthalmology 2002 · A randomized trial of atropine vs. patching for treatment of moderate amblyopia in children (PEDIG) · pubmed.ncbi.nlm.nih.gov
- Ophthalmology 2004 · A randomized trial of atropine regimens for treatment of moderate amblyopia in children (Repka et al.) · pubmed.ncbi.nlm.nih.gov
- Archives of Ophthalmology 2008 · Atropine vs patching for moderate amblyopia: follow-up at age 10 years (PEDIG) · pubmed.ncbi.nlm.nih.gov
- Archives of Ophthalmology 2008 · Patching vs atropine to treat amblyopia in children aged 7 to 12 years (Scheiman et al.) · pubmed.ncbi.nlm.nih.gov
- Cochrane Database of Systematic Reviews 2019 · Conventional occlusion versus pharmacologic penalization for amblyopia (Li et al.) · pubmed.ncbi.nlm.nih.gov
- EyeWiki (American Academy of Ophthalmology) · Amblyopia · eyewiki.aao.org
- American Association for Pediatric Ophthalmology and Strabismus · Amblyopia (glossary) · aapos.org