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 ...

A new option for bifocal and trifocal wearers is now available ... through the Spectacle Request Transmission System. These glasses are at no cost to eligible DoD retirees. Fitting kits for ...

The bifocal lenses are made from bilayer structures of liquid crystal (LC) cells and LC polymer. These lenses split light with a left-handed circular polarization (LCP) into two focused light ...

From the hand-held magnifying lenses used by Italian artists and scholars in the 13th Century, to the invention of bifocal lenses by American statesman and inventor Benjamin Franklin in 1784 ...

You may be more prone to this side effect if you’re wearing glasses for the first time or if your prescription has changed significantly. It can be particularly difficult adjusting to bifocals ...