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Eye patch in treatment of amblyopia
Amblyopia

Amblyopia, sometimes called a "lazy eye," occurs when one eye does not develop normal sight during early childhood. When one eye develops good vision but the other does not, the eye with decreased vision is called amblyopic. (Usually only one eye is affected by amblyopia.) This common condition should be corrected during infancy or early childhood to obtain 3-dimensional vision and prevent permanent vision loss.