In an auto extrication, I wear goggles, and a helmet mounted visor. However - and there's no pleasant way to put this - there's occasionally sprays of blood, vomit and other unidentified bodily fluids that can splash or spray if the paitent thrashes ot coughs and it will go right under your visor and get on your face. Thus the N95 mask. Not to mention then you have to deal with the idea that the blood just sprayed on your face is also in the air. I prefer to reduce that risk as much as possible.