As a result, people require multiple sets of eyeglasses for different conditions. Bifocal or trifocal or progressive lenses are really just multiple sets of lenses squashed into a smaller form ...

Advanced technology isn’t just for computers and machinery—it's making glasses better, too. Progressive lenses are a new solution for those needing near- and far-sided vision correction.

A progressive lens design is like a bi- or tri-focal lens in that it corrects more than one vision problem at a time. However, these lenses have no visible lines, improving the cosmetic appearance of ...