Certified Paraoptometric (CPO) Practice Exam

Question: 1 / 400

What do you call a lens where one part has no power and 90 degrees away there is power?

Effective diameter

Pl-cylinder

A lens where one part has no power and 90 degrees away is known as a Pl-cylinder. This type of lens is used to correct for astigmatism, a common refractive error where the eye has an irregularly shaped cornea. The other options are incorrect because they do not accurately describe a lens with these characteristics. Effective diameter refers to the size of the lens, prism is a type of lens that bends light, and concave (-) refers to a type of lens that curves inward.

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Prism

Concave (-)

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