I have a pair of Zeal Optics (model is ZU01) with interchangeable lenses. I love them because I have a small face and they fit great. I tried many of the smaller Smith glasses, but always looked like a bug because they were still too large for my face. I also used Spy microscoop, they were a little larger, but my eyelashes didn't touch the lens (so nice). I'd recommend both if you have a small face and long eyelashes.
Enjoy!