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Amblyopia, often called "lazy eye," is usually caused by strabismus (crossed or outwardly deviated eye position), or a significant difference in the strength of glasses needed for each eye (anisometropia), or by deprivation, where one eye is deprived of a clear optical image in early childhood, as by a cataract or corneal scar. Amblyopia only develops in childhood, not adulthood, and generally responds better to treatment (glasses or eye patches) when discovered early.
Monocularity versus Binocularity
Monocularity is using only one eye at a time for vision. Some depth perception is still possible, but stereo vision (true 3-D) is not obtained with monocular viewing. Binocularity, on the other hand, is the use of both eyes together. It provides 3-D vision, or better sense of object position in space. This is normal. People with strabismus, with the eyes not properly aligned, do not achieve normal binocular vision.
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