Eeyore is right, really. I haven't much thought about it that way, as I wore my combats 24/7 long before airsoft anyway for the better support they gave my feet.
I will certainly be looking into it and, likely, putting aside money for it. Fogging is a BIG problem for me, be it goggles, glasses or, most commonly, both. Dealing with it for good would make like so much nicer.