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Amblyopia
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Eyes Vision

Amblyopia

Commonly known as "lazy eye," amblyopia is the most frequent cause of visual impairment in children, occurring when an eye fails to work properly with the brain.

Overview

Amblyopia happens when the brain favors one eye over the other, even if the eye itself appears normal. In some cases, it can affect both eyes.

Causes

  • Strabismus: A disorder where the two eyes do not line up in the same direction.
  • Refractive error: When one eye cannot focus as well as the other due to its shape, including nearsightedness, farsightedness, and astigmatism.
  • Cataract: A clouding in the lens of the eye.

Diagnosis and Treatment

Amblyopia can be difficult to diagnose and is often discovered during a routine vision exam. Treatment focuses on forcing the child to use the eye with weaker vision through:

  • Patching: Wearing a patch over the stronger eye for several hours each day.
  • Eye drops: Using a drug called atropine in the stronger eye to temporarily blur vision.

It may also be necessary to treat the underlying cause, which could include the use of glasses or surgery.

Frequently Asked Questions

Patching schedules vary from a few hours a day to full‑day wear, typically lasting 4–6 months or longer. If resistance occurs, discuss alternative strategies such as atropine drops, vision therapy, or adjusting the patching schedule to balance effectiveness with compliance.
Children should receive a comprehensive eye exam before their first birthday and again at age 3, then annually until age 8, especially if they have risk factors like strabismus or a family history of vision problems. Early detection improves treatment success.
Parents notice that the child consistently covers or looks at one eye, has trouble focusing on close objects, or shows a preference for using one eye during activities. A pediatric optometrist will confirm reduced visual acuity in one eye and recommend patching if the difference is significant.
While treatment is most effective in children, adults can still improve vision through atropine drops, vision‑training exercises, or, in some cases, surgical correction of underlying causes. Success rates are lower, so early intervention remains key.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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