JCAT Certified Ophthalmic Assistant (COA) Practice Test 2026 - Free COA Exam Practice Questions and Study Guide

Convex lenses are used to correct hyperopia, also known as farsightedness. Hyperopia occurs when light entering the eye is focused behind the retina, leading to difficulty seeing nearby objects clearly. Convex lenses, which are thicker in the center than at the edges, help to converge light rays before they enter the eye. This adjustment allows the light to focus correctly on the retina, enabling clearer vision at near distances.

In contrast, concave lenses are used to correct myopia, or nearsightedness, where light is focused in front of the retina. Aspheric lenses are designed to reduce optical distortions and improve image quality, but they are not specifically used for hyperopia correction. Bifocal lenses accommodate both near and distance vision, but they do not exclusively correct hyperopia. Thus, the use of convex lenses is essential in effectively addressing the visual needs of individuals with hyperopia.