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What is astigmatism?

by aman in Science at 2017-04-17 16:17:38 got 1 Comments 14 Views
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aman comment on "What is astigmatism?"

This defect of vision arises due to non spherical shape of the cornea for the crystalline lens.
the eyelens of a person suffering from astigmatism has different focal length in a different Planes. the image of a point in the object appear as line and the image of a line may be distinct in one direction and blurred in another direction or blurred in both the directions.