also called photochromic lenses, are eyeglasses that respond to UV rays by transitioning to a darker tint. In other words, when you're indoors, these glasses have a traditional clear frame.

I’ve been wearing glasses since ... While visiting the Transitions labs in Galway, Ireland and talking with the scientists who’ve been perfecting these lenses for over five years, I learned ...

French Optical expands its eyewear line with Transitions Eyeglasses, designed for comfort and clear vision indoors and outdoors with light-adaptive l ...

Photochromic lenses are lenses that change their color depending on the current light situation. They will be clear indoors .