The condition in which both eyes have equal refractive power.
If, for example, one eye is myopic (nearsighted), so is the other. Or if one eye
is hyperopic (farsighted), so is the other. Or both eyes may have normal refractive
power.
The term "isometropia" is made up of three parts from the Greek: iso- (equal)
+ -metr- (measure) + -opia (vision). Literally, the measure of vision is equal.
The opposite of isometropia is anisometropia in which the two eyes have unequal
refractive powers.
Anisometropia is a serious concern in newborns and young children because it
can lead to amblyopia (impaired vision in one eye). With a major degree of anisometropia,
the brain cannot able to reconcile the difference in images coming from the two
eyes. It develops a preference for the image coming from one eye and suppresses
the image from the other eye and, in time, the brain loses the ability to "see"
the image from that eye.
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