The pair I have now has lasted four years or so, but I need a new pair. I need a new pair not because the frames are wearing out or because of scratches on the lenses, but because they lenses appear to be peeling. It's like some sort of coating is peeling off. One day I just started noticing it, thought they were smudges and tried to wipe them off, but then noticed the peeling. It's a huge pain to see through them. Has anyone else experienced this?