I also use goggles in the winter. Below -20C you pretty much have to. One irritation I've found is that 'Clear' seems to be a really unpopular colour for goggle lenses. I'm at the point where if I can stand it all, I'll put the goggles in the bag because the amber colour is too dark for typical winter riding (ie it's really dark out).

As for vision, I picked up a helmet mirror and absolutely love it. I highly recommend this for anyone, summer or winter.