Certified Paraoptometric Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What is a lens called that has only one curve?

Apex

sph/cylindrical

spherical

A lens that has only one curve is referred to as a spherical lens. In optics, a lens with one curved surface and one flat surface is known as a spherical lens. This type of lens can be used for correcting certain vision problems.

The other options are not correct:

- Apex is the highest point or tip of a lens.

- Sph/cylindrical refers to a combination of a spherical lens and a cylindrical lens, typically used in eyeglasses for astigmatism correction.

- Concave (-) refers to a lens surface that curves inward, causing light rays to diverge.

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Concave (-)

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