What Are Concentric Rings on Bifocal Contact Lenses?
Bifocal contact lenses correct presbyopia, a vision condition that happens to most people between ages 40 and 45. Smaller details become more difficult to see. This happens because the eye’s crystalline lens becomes less elastic and does not work as well. Bifocal contact lenses combine both far and near prescriptions to correct for presbyopia. These types of lenses work in several ways, one of which uses concentric rings.