What do lined bifocal lenses correct?

Lined bifocal lenses correct for two focal lengths, which allows individuals to see clearly at both distance and near vision. These lenses are designed with two distinct optical zones, separated by a visible line. The upper portion is typically for distance vision, while the lower part is optimized for reading or tasks that require close-up focus.

This design is especially beneficial for people with presbyopia, a common condition that affects the ability to focus on close objects as individuals age. The presence of two distinct areas in the lens enables users to transition smoothly between viewing distances, which enhances everyday activities like reading and driving. This specific functionality of lined bifocal lenses addresses the need for clarity at both near and far distances, making them a practical choice for those with dual vision needs.