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Question

In an astigmatic eye, the shape of cornea is ___. This defect is corrected using a ___ lens.


A
Spherical, convex
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B
oval, convex
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C
oval, cylindrical
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D
spherical, cylindrical
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Solution

The correct option is C oval, cylindrical

The shape of cornea in an astigmatic eye is oval and hence the vertical and horizontal rays from an object cannot be focused at one point i.e. retina. It is corrected using a cylindrical lens.


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