Question

Which lenses should be used to correct the defect of astigmatism?
A) Convex lens B) Bifocal lens C) Concave lens D) Cylindrical lens

Answer 1

Answer:

(d) Cylindical Lens.

Explanation:

This defect is when the light rays do not all come to a single focal point on the retina, instead some focus on the retina and some focus in front of or behind it. This is usually caused by a non-uniform curvature of the cornea. A typical symptom of astigmatism is if you are looking at a pattern of lines placed at various angles and the lines running in one direction appear sharp whilst those in other directions appear blurred. Astigmatism can usually be corrected by using a special spherical cylindrical lens; this is placed in the out-of-focus axis.

Answer 2

Explanation:

d is correct answers

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