Lenses with two powers are called?

Lenses with two powers are called?

• A. Bifocals
• B. Monocles
• C. Progressive
• D. Multifocals

Answer: (A)

Lenses with two distinct focal powers are designed to correct both distance and near vision in one frame. This two-power setup is what bifocals are. They typically show a visible line that divides the upper portion used for distance from the lower portion used for near tasks, making it easy to focus on nearby objects without switching glasses. Monocles provide a single corrective lens for one eye and don’t offer a second focal zone. Progressive lenses also run vision correction across a range of powers, but they blend smoothly from top to bottom without a defined, separate near segment. Multifocals is a broader term for lenses with multiple focal powers, which can include bifocals but isn’t specific to exactly two powers. So, the term that specifically denotes two powers is bifocals.

Lenses with two distinct focal powers are designed to correct both distance and near vision in one frame. This two-power setup is what bifocals are. They typically show a visible line that divides the upper portion used for distance from the lower portion used for near tasks, making it easy to focus on nearby objects without switching glasses. Monocles provide a single corrective lens for one eye and don’t offer a second focal zone. Progressive lenses also run vision correction across a range of powers, but they blend smoothly from top to bottom without a defined, separate near segment. Multifocals is a broader term for lenses with multiple focal powers, which can include bifocals but isn’t specific to exactly two powers. So, the term that specifically denotes two powers is bifocals.