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 ...

Bifocal or trifocal or progressive lenses are really just multiple sets of lenses squashed into a smaller form factor, and greatly reduce the wearer’s field of view which is itself a significant ...

But they can add a lot to the cost of glasses. Consider the possibility of trifocal lenses, which offer the same three ...

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