Mannys - Photochromic or transition lenses are lenses that are clear (or nearly clear) indoors and darken automatically when exposed to sunlight. It is one of the coolest inventions in the world
Transition Lenses • Light Sensitivity • How Transition Lenses Can Help
How To Activate Transition Lenses | Marvel Optics
Glasses Direct ™ - Transitions® Light Intelligent Lenses™
Can Transition Lenses Ever Be Cool - Tim Gunn Talks Transition Lenses
Transition Brown vs Grey - Photocromic Lenses - Rx-Safety
How to Make Transition Lenses Darker? | Transition Lenses and more | RX-able.com Blogs blog