I have to plug my glasses, they are from Zeal Optics, http://www.zealoptics.com/ and I love them!

They have a wide selection of sport frames designed to fit women's smaller faces. Even the smallest of Oakleys never fit me well. I have a weak prescription, but having a prescription pair of glasses on the bike is so wonderful, I don't know how I lived without them. The optics are simply incredible. I have the ZB-13 polarized lenses, which is their standard lens, and they are fantastic. (I have a Zooni frame). The prescription lenses are pricey, but so worth it. I wish I'd gotten them sooner. They carry some of their frames at REI, and a lot of them at Title 9, but I don't know if T9 has stores outside CO and CA.