I tried several expensive pair of glasses and finally ordered a pair from "The Best MC Glasses" and that's all I've wore since. They were like 15.00 plus a couple bucks shipping.
Check them out at, http://www.thebestmcglasses.com

 

I've got these PN 98269-10VM , the photochromatic goggles, I've found when I ride at night.... they're fine at Speed, they breath pretty well. But If I have to stop at a light or in traffic they start to Fog, I have to literally pull them away from my eyes and wiggle them to get some fresh air in. Oddly they are fine in the Daytime???