Certified Paraoptometric Practice Test

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Prepare for the Certified Paraoptometric Test! Study using flashcards, multiple choice questions, and detailed explanations. Get ready for your exam and boost your optometric skills!

Practice this question and more.

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

Effective diameter
Pl-cylinder
Prism
Concave (-)

The correct answer is: 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.