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Name the three common defects of vision. What are the causes ? Nan1e the type of lens used to correct each of them. |
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Answer» Solution :(i) Myopia: Cause : Elongation of eyeball TYPE of lens used for correction :Concave ]ens of suitable power (ii) Hypcrmetropia : Cause: Shrinking of eye ball Type of lens used for correction : CONVEX lens of suitable power (iii)PRESBYOPIA: Cause: weakening of ciliary muscles TYPES of lens used for correction : Bifocal lens |
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