American Board of Opticianry (ABO) Practice Test 2026 - Free ABO Practice Questions and Study Guide

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What does the cornea provide to an eye's refractive system approximately?

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Provides approximately 43 diopters of power to an eye's refractive system

The cornea provides approximately 43 diopters of power to an eye's refractive system. The cornea is the clear front surface of the eye that plays a significant role in focusing light onto the retina. This focusing power is measured in diopters, and the cornea contributes a majority of the eye's total refractive power. The other options are not accurate in describing the role of the cornea in an eye's refractive system.

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