A) a concave lens
B) a bifocal lens of which lower portion is convex
C) a bifocal lens of which upper portion is convex
D) a convex lens
Correct Answer: B
Solution :
A bifocal lens, in which lower portion is convex to provide correction to hyper- metropia and upper portion concave to provide remedy for myopia is used for presbiopia.You need to login to perform this action.
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