Types of eyeglasses
Friday, May 30th, 2008Types of eyeglasses 1.Corrective Corrective lenses modify the focal length of the eye to alleviate the effects of nearsightedness (myopia), farsightedness (hyperopia) or astigmatism. As people age, the eye's crystalline lens loses elasticity, resulting in presbyopia, which limits their ability to change focus. The power of a lens is generally measured in diopters. ...