I use yellow lenses for the simple reason that I'm too lazy to go find clear ones for my glasses. One thing I have noticed is that yellow lenses and HID of LED light sources don't mix 100%. Even factoring in the 13% loss of light transmission, the slight blue shift of the HID/LED means I don't see as much as I could with the yellow lenses. The center of the light pattern is always bright, but as I look to the periphery, it's darker than it should be. If I ride without glasses, it's very bright. Maybe too bright...