Amblyopia:Partial or complete loss of vision in one eye caused by conditions that affect the normal development of vision. These conditions include strabismus, in which the eyes are crossed inward (esotropia) or turned outward (exotropia) andanisometropia, in which there is a major difference in refractive error between the two eyes fromnearsightedness, farsightedness, or astigmatism. Less common causes ofamblyopiaincludeptosis(drooping) of one眼睑, disease of the角膜(preventing light from entering the eye),congenitalcataract, and injury to the eye of a young child.
In amblyopia, the brain favors one eye over the other. The other eye is ignored. It is not adequately stimulated and the visual brain cells do not mature normally. Amblyopia is the most common cause of monocular blindness, partial or complete blindness in one eye. Amblyopia affects 2 to 3% of children in the US.
Treatment of strabismus may involve surgical correction of the eye muscle imbalance. In the case of severe refractive error, it should be corrected by glasses, contact lenses or, if appropriate, lasix. Wearing an eye patch over the stronger eye is a hallowed treatment for amblyopia. Another option isatropineeye drops to blur the vision temporarily in the stronger eye. Weekend atropine provides an improvement invisual acuityof a magnitude similar to that provided by daily atropine in treating moderate amblyopia.
The term "amblyopia" is sometimes incorrectly used interchangeably withlazy eye. "Amblyopia" is made up of ambly- from the Greek "amblys" meaning blunt, dull, faint, or dim and -opia from the Greek "ops" meaning eye, and refers to vision, so amblyopia is literally dim vision.
See also: Anisometropia: Nocturnal amblyopia; Strabismus.
