Question

Which defect of the eye can be corrected by using a cylindrical lens?

Answer 1

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The defect of the eye that can be corrected by using cylindrical lens is Astigmatism.

Astigmatism is caused due to uneven curvature of the eye lens. As a result, some portions of the things one views, appears to be blurred. It generally occurs above 30 years of age, but it also occurs in children, who are inclined to watch Television from wrong angles.

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Answer 2

$\bf{Astigmatism}$ is that defect of eye which can be corrected by using cylindrical lenses.

This defect causes because of defect arises when the cornea of the eye has different curvatures in different directions in the horizontal and vertical plane.