Airburst

I'm not sure this is the right section to post this in, but, last Christmas, I received a set of sunglasses/goggles that have interchangeable lenses. They are intended for cycling use, with dark and clear lenses for different weather conditions, but they also have a set of lenses which are, according to the leaflet they came with, intended for "low-light use". They're sort of orange, but I can't figure out how they're actually supposed to work. Can anyone shed some light (no pun intended) on the situation? Specifically, is this just marketing BS? (I've got a nasty feeling it is). If not, what do these lenses actually do to help me see in low light levels?

Al1943

Yellow and orange lenses work well in low light conditions, cloudy or foggy days. But I don't know why. Try Google.

coffeecake

They block glare, but still let more light through than dark glasses. So you can see better when you ride off into the sunset.

cyccommute 

Yellow and orange lenses do little to block glare, if by glare you mean bright light. They do block the blue end of the spectrum and make other colors brighter, thereby increasing contrast. I've found the yellow lenses...as well as vermillion... useful on cloudy days. They aren't good for night riding at all with vermillion being worse than yellow. At night the contrast is just too high. Anything black...holes, shadows, etc...become very dark even with good illumination.

Greenfieldja

The orange lenses (and yellow that come in some sets) are good for helping to increase contrast in low light conditions such as over cast days or in the early morning or evening when the light is "flat" and there isn't much contrast or shadow to help differentiate terrain such as dips in the road or potholes. These color lenses are really good for skiing on grey days where it is hard to see the differentiation of the snow cover.

-j