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

The correct answer is bifocal lenses, as they are specifically designed to provide clear vision at two different distances: near and far. Bifocals feature distinct segments within a single lens—typically a top portion for distance vision and a bottom portion for reading or tasks that require close vision. This design allows wearers to transition easily between viewing distances, making them ideal for individuals who need corrective vision for both types of activities.

To provide context, spherical lenses are uniform in curvature and correct vision for only one distance, either near or far, but not both. Planocylindrical lenses are specialized optical designs primarily used for astigmatism; they do not provide the dual-vision benefit like bifocals do. Spherocylindrical lenses also address astigmatism and may correct multiple vision needs, but they are generally not specified for clear vision at discrete near and far distances in the same way bifocals are.