Certified Paraoptometric (CPO) Practice Exam 2026 - Free Paraoptometric Practice Questions and Study Guide

Question: 1 / 420

What do you call the additional curves that surround the optical zone of a lens?

Fringe Curves

Peripheral Curves

The term that describes the additional curves surrounding the optical zone of a lens is "Peripheral Curves." These curves are crucial in providing a smooth transition from the central optical zone to the edge of the lens, enhancing the overall comfort and fitting of the lens on the wearer's face. They help to reduce optical distortions and improve the aesthetics of the lens. Understanding the role of peripheral curves is important for ensuring proper lens performance and wearer satisfaction.

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Boundary Curves

Outer Curves

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