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Question : Name the three common defects of vision. What are their causes? Name the type of lens used to correct each of them.

Answer»

Solution :i) MYOPIA :
CAUSE : ELONGATION of EYEBALL.
Types of lens used for correction, concave lens of suitable power.
ii) Hypermetropia :
Cause : SHRINKING of eyeball Types of lens used for correction : Convex lens of suitable power.
iii) Prerbyopia :
Cause : Weakening of ciliary muscles. Type of lens used for correction : Bifocal lens.


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