Amblyopia, often called lazy eye, is a condition that occurs when there is a reduction of vision in 1 eye that is not correctable with glasses.

There are two common types of amblyopia:

  • Anisometropic amblyopia—Vision in one eye differs from the other. This is often caused by a large difference in eyeglass prescription. The difference may be caused by 1 eye being more nearsighted or farsighted than the other, or by large differences in astigmatism.
  • Strabismic amblyopia— Visible misalignment (crossing) of one eye.

Strabismic Amblyopia
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The sooner amblyopia is treated, the more favorable the outcome.

Amblyopia is caused when the brain prefers (favors) one eye to the other. The brain’s preference (liking) for one eye over the other can weaken and reduce vision in the eye that is less used.

There are no apparent genetic or environmental factors that can be attributed to causing amblyopia.