I've worn a mask every work day, sometimes for hours at a time, for the last 30+ years. I've worn glasses, safety glasses at first then prescription, for every one of those days. Ever since I started needing prescription glasses to work I've worn a face shield too. Now that we have to wear an N95 we also have to wear a surgical mask over it to protect it from splatter (you still can't get enough N95s not to have to reuse them) . It's not a big thing. You just learn to do it. You do NOT recycle enough CO2 to make any difference at all by the way, not even in that get up. That is a a total myth.