I have considered buying these but was wondering: Does anyone have a problem with them leaving a mark on your nose? I am assuming they are lightweight though, right? I'm considering purchasing online and maybe selling a pair of Gucci's (maybe-- have to become de-attached, haha) and that pair leaves a mark that is a real annoyance to me. They are a little heavy. I just want to make sure I won't run into the same problem with these because it's a big reason why I want to buy another pair right now. Thanks!