It may be totally in your head. I am in Whistler BC for a few weeks with my family and I took my sun glasses (with a light perscription for stygmatism) instead of my goggles (w/out perscription) snowboarding on a sunny day last week. I was faster and more aggressive than usual, probably because I could see better and I rely on my sight for seeing ice pockets and flat spots, whatever… that said, the Paralympics are here next week and my yoga teacher works ski-patrol, she told me about a ski-racer who is blind. she races by audio queing and feel, I guess my need for extra-sensory stability is really just in my head.