Firstly, you can buy contacts as contacts do not have frame, so they needn't the function of nose. To be honest, I have a small nose too, but I also wear framed glasses often, of course I found many problems when I wear them. The disadvantage of small nose for glasses is that the nose pads are easy to slip. So, you should select glasses with wide bridge distance, but this is not the biggest problem, the optician will test for you and make a debugger. If your face is also small, you can have the lenses small, too, because they can make your nose and face outstanding.