ANATOMY

Detailed explanation-1: -Light passing through a convex lens is converged. Convex lenses are used to treat presbyopia, hypermetropia and aphakia. If parallel light is brought to a focus at 1 metre the lens is said to have 1 dioptre of power.

Detailed explanation-2: -To correct the problem, the lens must be weakened. To weaken the lens, a diverging or negative artificial lens is used, that is, a concave lens. A diverging lens is wider at the edges than at the middle. As a result, light is spreading out even more after the light has passed through the lens than before.

Detailed explanation-3: -Convex lenses. These lenses are thickest in the center, like a magnifying glass. They are used to correct farsightedness (hyperopia).

Detailed explanation-4: -Vision problems such as myopia and hyperopia can be corrected with lenses that help focus light on the retina. Myopia is corrected with a concave lens, while hyperopia is corrected with a convex lens.