Bifocal lenses help to the natural change of perception that comes with age or presbyopia. Performance-wise they remind a lot about the glasses that will help against the same problem. The lens has a key strength, which is used to see things from a distance, and another slightly smaller area with a different strength, used for, for example, reading.
Bifocal lenses help to the natural change of perception that comes with age or presbyopia. Performance-wise they remind a lot about the glasses that will help against the same problem. The lens has a key strength, which is used to see things from a distance, and another slightly smaller area with a different strength, used for, for example, reading.
