Lens is used to correct the defect of vision termed as presbyopia.

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Convex

Concave

Bifocal

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answer is C.

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Detailed Solution

Concept-
Lens used in the eyes when a defect happened in our eyes called presbyopia. There are three types of vision defect in our eyes:-
1- Myopia: In this defect, a person cannot able to see a larger distance object clearly and to Remove this defect concave lens are used 2- Hypermetropia : In this defect , a person cannot able to see a nearer distance object clearly and to remove this defect convex lens are used
3- Presbyopia: This type of defect commonly found in old - aged people .In this defect the person is not able to see both a nearer and larger distance clearly so to remove this defect we used bifocal lens which is a mixture of both concave and convex lens.
Hence, the correct answer is option 3.

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