Certified Paraoptometric (CPO) Practice Exam 2025

Which lens option would best suit a patient needing distinct correction in three different fields of vision?

1. Single vision

2. Trifocal

3. Bifocal

4. Progressive

The correct answer is: Trifocal

The best lens option for a patient requiring distinct correction in three different fields of vision is indeed trifocal lenses. These lenses are specifically designed to provide clear vision at three different distances: typically for distance, intermediate, and near vision. Each section of the lens is dedicated to a particular focal length, allowing the wearer to easily transition from one visual range to another without having to switch glasses. In contrast, single vision lenses only correct one area of vision, making them unsuitable for someone needing corrections for multiple distances. Bifocal lenses traditionally have only two segments for distance and near vision, leaving out the intermediate range. Progressive lenses, while they offer a gradient of corrections from distance to near without visible lines, are generally used for a more seamless transition between vision ranges and may not distinctly cater to three specific fields the way trifocals do. Thus, trifocal lenses provide the best solution for the given need.