Discussion
What is used for correcting astigmatism?
Answer: A
Astigmatism is corrected with a cylindrical lens.
In astigmatism the cornea or lens is curved more in one direction than another, so the eye focuses lines in one direction differently from lines at right angles to them. A cylindrical lens has power in one direction only, so it can correct the error in that particular meridian.
A converging (convex) lens corrects long-sightedness and a diverging (concave) lens corrects short-sightedness; both have the same power in all directions. Mirrors are not used to correct vision.
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