Eyeglasses for spring 2013 have already published, lots of fashion magazines wrote analyses on them. As a conclusion, retro style take this year as well.
For women, I think FENDI, D&G would be the best choice. If you are very outgoing, I think FENDI sunglasses' bright colors would help you to express yourself more. And if you are much more quite, D&G's cute and lovely style is suitable for you. As I can see, retro frame is the main stream, so you can choose vintage sunglasses, and then you'd never be out of style.
You know as for the fashion trends, it always a circle. What was the most fashionable trend; it will be fashion again nowadays. The trends of glasses is supper light, dirty-proof and wear-resistant. The vintage and classic ones will be the best choice. Besides, polarized light sunglasses will draw most of the attention; it can be anti-ultraviolet and dazzle resistance, which would bring more ways to protect your eyes.