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 ...

And while Luxottica has nothing to worry about yet, he did manage to get some clearly if subtly photochromic samples, despite the challenges.

Transitions Gen S lenses are equipped with patented photochromic dyes that enable them to rapidly darken when they are ...

The answer is a photochromic lens and ekoï have taken it a step further with their E-LENS Electronic glasses. I like photochromic glasses, my ‘normal’ every-day glasses are photochromic and I’ve ...