I picked up some Pyramex XSG and Highlander XP to check out; their ratings make them adequate for airsoft use (most other military eyepro is tested for airsoft specifically, either, but if it'll stop a .22 bullet it should be okay against BBs).
I use the Highlanders are safety glasses when working.
While neither pair "fog" per se, they do form a watery film: while not as vision impairing as fog, it eventually does make it very difficult to see through the glasses -- although arguably you could make your way back to a safe zone looking through the distorted "underwater" lenses, while fog would just leave you completely blind.
But in terms of "keep going, no fogging" they're still inferior to shooting glasses or fan-equipped goggles.
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