Dear Gear Guy, I'm taking a glacier-climbing class this spring and the instructors are staunchly recommending glacier glasses with a 10 percent light transmission. I'm wondering if I can wear my Oakley Mumbos with 11 percent transmission. My thinking is these will give me better peripheral vision.
Snow blindness is a real threat and they want to ensure their clients' safety.
Still, from a strictly light-transmission standpoint, the Mumbos are probably fine. I'm not familiar with the style of that particular model, though, so you'll have to ask if they give full wrap-around protection. The fact that you mention their peripheral vision suggests they do not. For that reason, I'd strongly suggest you get a pair of glacier glasses. You won't believe how bright a glacier can be in strong sunlight, and there's simply no point to fooling with your eyes.