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Question

What is astigmatism? How is it caused? How is it corrected? (OR)
What is astigmatism and how is this vision defect counteracted?

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Solution

Astigmatism is a refraction error in which a person cannot simultaneously see both the horizontal and vertical views of an object with the same clarity. In this defect of vision, light rays fail to come from a single focus.

It can be corrected by using cylindrical lens which have different curvature in horizontal as well as in vertical direction.

1692121_1480948_ans_b1bf62ede64d4dbca09c2e2810f569ab.png

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