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 for active-duty personnel and Department of Defense (DoD) retirees. The addition, known as the '5A-M,' was added to ensure there ...