I just wipe 'em off now and then, usually not too bad. A worse problem I have right now is with the cooler weather and wearing a buff up over my nose, I fog up.

Most that I know, use a cap. I have thought about, but not tested, those visor things, cuz my head gets too hot with any kind of full cap. I also know a few that say the helmets with a little bit of visor help quite a bit, too.

I sometimes go without my glasses, but that has its downside as well, getting pelted in the eyes hurts.