The lenses in my glasses — and yours too, most likely — were made by Essilor, a French multinational that controls almost half of the world's prescription lens business and has acquired more ...

Or perhaps you didn’t realize that your glasses weren’t giving you optimal vision until an eye exam made that clear ... for the first time. Bifocals have two distinct lens powers.

Smart glasses have been available ... 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 ...