General Z87+ PhotochromicLight Adjusting Lenses That Work as Hard as You Do Our photochromic lenses adapt to changing lightso you dont have to. Indoors or in low light, they stay clear. Step outside, and they darken automatically to shield your eyes from the sun. No swapping glasses. No squinting. Just one pair that works all day, on and off the job. How it works: Reacts to UV light Darkens in direct sunlight Clears up indoors or in shade 100% UV protection, all the time