I had melanoma in my eye and surgery at UCLA in April. Needless to say, I need to protect my eyes from the sun. I've tried the switching between two pairs of prescription glasses -- what a pain! The photograys are never dark enough, especially in the car when driving (or riding). I used a clip for years but finally figured out that my prescription is such that it curves out and the clip was scratching up my glasses (not me!). I hated the idea of "old lady" glasses, but these look pretty stylish, really keep out the sun, allow for peripheral vision, are much more sturdy than the drugstore type I had, and less expensive than that other brand. Win, win, win, win. Gotta order another pair.