Certified Paraoptometric (CPO) Practice Exam

The correct answer is trifocal, as trifocal lenses are specifically designed to provide clear vision at three different distances: near, intermediate, and far. This makes them particularly useful for individuals who require assistance with both distance and reading tasks, as well as tasks that require an intermediate range of vision, such as using a computer.

Trifocal lenses typically have distinct sections that are optimized for each viewing distance, facilitating a smoother transition from one distance to another compared to bifocals, which only offer correction for two distances (near and far). Many users find that trifocal lenses provide a better option for versatile viewing, enhancing daily activities that require vision at multiple ranges without the need for switching between different pairs of glasses.

Progressive lenses also correct for multiple distances but in a gradient fashion without visible lines, allowing for a more natural vision transition. However, they do not have the distinct sections found in trifocal lenses. Single vision lenses, on the other hand, are designed for one specific distance, making them unsuitable for individuals who need corrections for three different viewing ranges.