Multiple choice

Which of the following lenses should be used to correct the defect of astigmatism?

  1. Cylindrical lens

  2. Concave lens

  3. Convex lens

  4. Bifocal lens

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A Correct answer
Explanation

Astigmatism is a refractive error caused by an irregularly shaped cornea or lens, which prevents light from focusing properly on the retina. A cylindrical lens is used to correct this by focusing light differently in different meridians.