3M Smart Lens safety glasses with transitioning lens change from dark to clear in 35 seconds and from clear to dark in 8 secs. 3M Smart Lens polycarbonate transitioning lens (Photochromic) absorb 99.9% UV rays. Smart Lens auto darkening glasses from 3M features springed-hinged temples for narrow or wide fit. Meets ANSI Z87.1-2003. SmartLens glasses also meets traffic signal recognition requirements of ANSI Z80.3-2008. Do you need safety glasses that are for indoor and out door use? 3M lens changing safety wear provides fast and reliable eye protection when working inside and working outside all in one eye wear. There is no need for other glasses when you have clear lens and dark lens all in one safety glass for your work application.