Much like bicycling glasses, mirrored lenses are preferred for sunny conditions. For overcast days or night boarding, you will want something that is lighter in colour. As per the Spy Optic FAQ section on their website:
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Originally Posted by SpyOptic.com
Spy has a wide range of lenses for every condition imaginable. In general, the best all around sunglass lenses are gray or bronze. Gray has the truest color while bronze enhances colors and offers outstanding definition and depth perception. In low light conditions (overcast, snowing), lens colors such as clear, persimmon (orange), yellow and rose are the best. We also offer mirrored lenses that are best for the brightest conditions. - Source: http://www.spyoptic.com/faq |
Also, see the image as posted on SpyOptic.com in reference to snowboarding goggles:
Hope that helps!