MCQ Detailed View

Presbyopia is an age-related vision condition in which the eye gradually loses the ability to focus on close objects. This occurs because the lens of the eye becomes less flexible over time, reducing its ability to change shape for near vision. It commonly begins after the age of 40 and affects reading, writing, and other close-up tasks.

The most effective way to correct presbyopia is through the use of bifocal lenses. A bifocal lens has two distinct optical powers: the upper part is generally for distance vision, while the lower part helps with near vision. This allows people with presbyopia to see clearly at both far and near distances without the need to switch glasses. Other lens options like convex lenses may help in early-stage hyperopia, concave lenses are used for myopia, and cylindrical lenses are for astigmatism, but only bifocals specifically address presbyopia’s dual focus requirement.

Bifocal lenses work by compensating for the reduced accommodation of the eye lens. Modern solutions also include progressive lenses, which provide a gradual change in lens power from distance to near vision, offering a more natural visual experience without visible lines.

Understanding presbyopia and its correction is essential in biology, physiology, and everyday science, as it explains how age affects human vision and how optical devices help restore visual clarity. Using bifocal lenses allows people to maintain normal daily activities, such as reading, working on computers, and performing precise tasks.