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Q.

A cylindrical lens is required to correct which of the following defects?


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a

Myopia           

b

Presbyopia           

c

Hypermetropia           

d

Astigmatism 

answer is D.

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Detailed Solution

A cylindrical lens is required to correct astigmatism.
A cylindrical lens is a lens that focuses light in a line rather than a point, as is a spherical lens. A person suffering from astigmatism cannot see the horizontal and vertical lines clearly, simultaneously. This is due to the imperfect spherical nature of the eye lens. This drawback can be overcome by using cylindrical lenses.
 
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