Certified Paraoptometric (CPO) Practice Exam 2025

Which lens type offers the most versatility in optics by providing multiple focal points in one lens?

1. Bifocal lens

2. Trifocal lens

3. Progressive lens

4. Single vision lens

The correct answer is: Progressive lens

The correct answer is progressive lens because it offers a seamless transition between multiple focal points, allowing the wearer to see clearly at various distances—near, intermediate, and far—without the visible lines that bifocal or trifocal lenses have. This design caters to people with presbyopia or those who require different prescriptions for reading and distance vision. Unlike bifocal lenses, which have two distinct viewing areas, and trifocal lenses that offer three segments for different distances, progressive lenses provide a more natural visual experience as they gradually change in power. This makes them more versatile, as users can shift their gaze across a wide range without needing to reposition their head to find the correct lens segment. Single vision lenses, while effective for correcting one visual distance, do not accommodate multiple focal points and therefore lack the versatility that progressive lenses provide.