Multi-focus lenses are a special type of contact lens. They are intended for users who have poor close vision and are far-sighted, rather than near-sighted.
Function
Multi-focus contact lenses are meant to eliminate the need for reading glasses in people who have decreased near vision, due to age or conditions such as presbyopia. These lenses allow users to see both near objects and far objects equally well.
Shape
Traditional contact lenses are round and shaped like a bowl, but multi-focus contact lenses are not perfectly round. Because of their specialized shape, multi-focus lenses are able to have different regions on the lens that offer different magnifications.
Structure
With a multi-focus contact lens, the center of the lens is meant for near vision and offers a stronger power or magnification than the rest of the lens. As you move out from the center of the lens in all directions, the magnification or strength gradually diminishes until there is no magnification at all on the outer edges.
Significance
Multi-focal lenses are different from bi-focal lenses in that they do not provide any long-distance vision correction.
Disposable
Most multi-focus contacts are disposable; they are meant to be worn for 30 to 60 days and then thrown away.
Tags: center lens, contact lens, contact lenses, near vision