I am a klutz when it comes to sunglasses. I have lost count of how many that I have either sat on, dropped or misplaced. Therefore I would never spend $$$ on some Oakley shades. To me sunglasses are disposables. The ones I have are UV protected and one of them even is polarised. Spent $50 for them. I don't feel the pain if something ill were to happen to them either.
Why just the other day, while trying to lock my bike, my sunglass that was hanging off my t-shirt fell off. the glass and frame came apart. Meh, some super glue will make it all nice again.