I have very sensative eyes and I used to end up buying around 5 to 10 pairs of cheap 10 dollar sunglasses a year or so because they would always break. Finally, I got fed up and purchased a pair of Bolles for $150. My friends went nuts and told me I was stupid. I don't regret a single penny spent on those glasses and I'll never buy a cheap department store set of frames again. The difference is not even being aware that you're wearing sunglasses. The other difference is material strength. I've had those sunglasses for 3 years now and I still wear them daily even cycling and they've held up great. I'm not saying you have to go all out and buy 300 dollar frames but you'll likely notice the difference betweeing department store frames to anything in the 100 dollar range especially if you buy polarized lenses or have sensative eyes.