A lot depends on the shape of your face.  Try them all on and bring a girl friend who is honest with you.  I have a small face and my personal favorites are the right Big glasses.. Think Audrey Hepburn in BReakfast at Tiffany's.  The other really sexy choice is a pair of libraian looking glasses.  Trust me on this.. Librarian glasses.. Pencil skirt and the right attitude is HOT :)

 Where the right type of clothes for your shape and ones that make you look nice then all the focus will be down not up

 The best sort are the frameless ones, they almost look as if you're not wearing any

 Just ask your optition if you could ever wear contact lenses (i did and now i can wear contact lenses, it made me feel so much better and confidant about my self and now i wear them when ever i can) if you cant then just forget about your glasses and focus on the things you CAN change:)