Question Detail
Question
Which type of lens is specifically designed to correct astigmatism?
Correct Answer
Option C is the correct answer.
Detailed Explanation
The document states: 'Astigmatism is corrected by using a lens with a cylindrical surface.' Cylindrical lenses have different refractive powers in different meridians, which helps to correct the uneven focusing of astigmatism.
Hint
Consider the shape of the cornea in astigmatism and what lens shape could compensate for it.