Astigmatism for a human eye can be removed by using an additional:

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Concave lens

Convex lens

Cylindrical lens

Prismatic lens

answer is C.

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Detailed Solution

Concept: Astigmatism can be treated in one of three ways: using glasses, contacts, or laser eye surgery. There are more eye problems, such as myopia, hypermetropia, and presbyopia, which require the usage of various lens types to correct.
In the first three alternatives, the cylindrical lens has been applied to a human eye when using lenses to correct astigmatism. Astigmatism is a condition in which one eye cannot focus on both vertical and horizontal lines at the same time. With such an eye, the horizontal portion of an object will not be as clearly apparent as the vertical portion. This occurs when the eye's corner is curved differently in each direction. By wearing glasses with a cylindrical lens, this can be fixed.