We offer photochromic lenses, which is the technical term for light reacting lenses. These lenses automatically become darker when you head out into the sun giving you 100% UV protection. These are a very popular choice as it saves you having to carry a second pair of prescription sunglasses around with you in case the sun comes out!
We also offer the branded Transitions® lenses version of this type of lens. (Transitions is a registered trademark of Transitions Optical, Inc., used under license by Transitions Optical Limited.)
Please note: Photochromic lenses are quicker to darken than they are to fade and do not work behind car windscreens that block UV light.