As in the ones that help you see better, not the ones you drink out of. Here is my dilemma: I have seen a few pairs online that I like the look of, but I'd like to try them on first. I've phoned around the stores that sell them through their websites, but none of them have those particular models in stock. I doubt they'd want to order them in for me just to try on. Is there a good reason for me *not* to buy a few pairs online, then send back the ones I don't want? Could that backfire in any way I haven't anticipated? Alternatively: other solutions? Like a high-street shop that sells every pair of glasses in the world?