Amblyopia, commonly called lazy eye, is reduced vision in one eye, occasionally both, because the brain did not learn to use that eye properly during early childhood. The eye itself often looks healthy. It affects about 2 to 3 in every 100 children.
It can be treated very effectively if found early, ideally before the age of 7, by correcting the underlying cause and making the brain use the weaker eye. Results become less predictable as a child gets older, and in adults improvement is limited. Squint surgery straightens the eyes but does not in itself cure amblyopia.
Symptoms
- Often no complaint at all, because the child sees well with the other eye
- An eye that turns in, out, up or down
- Poor depth perception, clumsiness or bumping into things on one side
- Squinting, closing one eye or tilting the head
- Objecting when the good eye is covered but not when the weaker one is
- A droopy eyelid or a cloudy pupil
- A failed vision screening test at nursery or school
Causes and risk factors
Amblyopia develops when the two eyes send unequal images to the brain during the critical period of visual development, and the brain suppresses the poorer image. The three causes are strabismus, in which the eyes point in different directions; anisometropia, a significant difference in focusing power between the eyes, or high long sight or astigmatism in both; and deprivation, when something blocks vision, for instance a congenital cataract, a droopy eyelid covering the pupil or a corneal scar. Deprivation amblyopia is the most severe and the most urgent. Prematurity, developmental delay and a family history of squint or amblyopia raise the risk.
How it is diagnosed
- Age-appropriate vision testing: Picture or letter matching tests for each eye separately from about age 3, and preferential looking tests for younger children.
- Cycloplegic refraction: Drops relax focusing so the true spectacle prescription can be measured. It is essential, because children can mask long sight.
- Orthoptic assessment: An orthoptist measures eye alignment, eye movements and binocular vision.
- Examination of the eye: Through dilated pupils, to exclude cataract, retinal or optic nerve disease or, rarely, retinoblastoma.
Treatment options
- Glasses: Worn full time, they are the first step, and improve vision considerably on their own over 3 to 4 months in many children.
- Patching: An adhesive patch over the stronger eye for 2 to 6 hours a day, depending on severity, usually for several months, with activities such as drawing or reading during patching.
- Atropine drops: Blurring the stronger eye with a drop, daily or at weekends, is an alternative to patching for mild to moderate amblyopia.
- Treating the cause: Early cataract surgery, correction of a droopy lid, or squint surgery where indicated, combined with the treatments above.
- Binocular digital therapies: Games and videos presented differently to each eye. They are being studied, and current evidence does not show them to be better than patching.
- Monitoring for recurrence: Vision is checked until about age 8 to 10, since it can slip back after treatment stops.
When it is urgent
Amblyopia is not an emergency, but some of its causes are. A white or cloudy pupil, a newly appeared squint, eyes that wobble, or a droopy eyelid covering the pupil in a baby need an eye specialist's examination within days. A sudden squint with headache, vomiting or double vision in an older child needs urgent medical assessment locally.
Travelling to Türkiye for treatment
Treatment involves checks every 6 to 12 weeks over months or years, which makes a local orthoptist and ophthalmologist essential. A visit abroad can provide a thorough assessment with cycloplegic refraction and a second opinion, or a planned operation for squint, congenital cataract or ptosis, but the patching and follow-up that determine the visual outcome will happen at home. For adults, be sceptical of programmes that promise to restore vision in a lazy eye; gains, where they occur, are modest.
Send your reports, scans and a short history and a Clinic-Y coordinator replies within 24 hours with suitable teams and written, all-inclusive proposals side by side. Reviewing your case is free.
الأسئلة المتكررة
Is it too late to treat my 9-year-old?
Not necessarily. Response is best before 7, but worthwhile improvement is seen in many children up to the early teens, particularly if never treated before. It is worth trying.
Can adults be treated?
The adult brain is less adaptable. Some adults gain a line or two with intensive therapy, but there is no established treatment, and laser eye surgery does not cure amblyopia.
Will squint surgery fix the vision?
No. Surgery aligns the eyes. Vision is improved by glasses and patching or atropine, usually before surgery.
My child hates the patch. What can we do?
This is common. Start with short periods combined with a favourite activity, use reward charts, and ask about atropine drops as an alternative.