Certified Paraoptometric (CPO) Practice Exam 2025

Which type of lenses are often used due to their ability to view things at arm's length?

1. Bifocal lenses

2. Single vision lenses

3. Multi-focal lenses

4. Trifocal lenses

The correct answer is: Multi-focal lenses

The correct answer is multifocal lenses. Multifocal lenses are designed to provide clear vision at multiple distances, enabling individuals to see both near and far without needing to switch between different pairs of glasses. Specifically, these lenses are beneficial for tasks that require viewing objects at arm's length, such as reading or working on a computer. Bifocal lenses, while they do provide two distinct optical powers, usually cater to both near and far vision but may not be as flexible for intermediate distances. Single vision lenses are focused on just one distance, either near or far, and wouldn’t support the varying depth required for viewing things at arm's length. Trifocal lenses enhance the capability slightly further by offering three distinct viewing zones, but they may not be as commonly embraced as multifocal lenses, particularly in modern eyewear options.