Certified Paraoptometric (CPO) Practice Exam 2025 – All-in-One Study Guide to Ensure Exam Success!

Bifocal lenses are designed specifically to provide vision correction at two distinct distances, typically for viewing at distance and near. They have a distinct line separating the two visual zones: the upper portion for distance vision and the lower portion for near tasks, such as reading. This design allows the wearer to easily switch focus between two different types of visual demands without the need for switching out lenses.

In contrast, trifocal lenses incorporate a third section for intermediate vision, thereby serving three distances – distance, intermediate, and near. Multi-focal lenses also imply multiple sections, but the term is more general and does not specify only two distances. Spherocylindrical lenses refer to a type of lens that combines spherical and cylindrical optical powers, useful for correcting astigmatism, but they do not inherently denote a capability for viewing at two different distances. Thus, bifocal lenses are the clear choice when identifying a lens type that accommodates two viewing distances.