name the refrective deffect of vison explain it reason and corrective of these deffect
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Myopia : In myopia a person cannot see distant objects clearly.
Cause :The decrease in focal length of the eyes lens.
Remedy :Using a concave lens of suitable power.
Hypermetropia : In this defect, a person cannot see near by objects clearly.
Cause : Focal length of eye lens becomes large or eyeball becomes too short.
Remedy : Using convex lens of appropriate Power
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