Second pair I've purchased. First pair lasted a little more than 3 years before I decided that the spots the lenses developed were "too much" for my personal tastes. They've been exposed to hot oil spray, been hit with ejected brass from firearms (I'm a full-time firearms instructor for the military), dropped, and the only real "damage" was the nose piece wore out. Fortunately, it was an easy fix with a nosepiece from one of our stock glasses we keep on-hand at my site. They're great, I love them, and when this new pair exceeds my personal tolerance, I'll get ANOTHER pair.