Certified Paraoptometric (CPO) Practice Exam

Question: 1 / 400

What is the center area of the lens that provides optical correction for the patient's vision?

Base curve radius

Peripheral curves

Optical zone

The center area of the lens that provides optical correction for the patient's vision is known as the optical zone. This area is specifically designed to correct the patient's refractive error and provide clear vision. The base curve radius refers to the curve on the back surface of the lens, while peripheral curves are the additional curves around the edges of the lens. Segment height is the measurement from the bottom of the lens to the top of the segment in a multifocal lens. However, none of these options specifically refer to the central area of the lens responsible for optical correction, making the correct answer the optical zone.

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Segment height

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