[MichaelJ]

Clear over sunglasses certainly answers most questions - the sunglasses handle the light, and the goggles take care of the wind/cold protection. However, fogging is always a risk when you double up like that. I should say that while I chose my goggles so I could wear them over my glasses, I do have fogging issues with my glasses when I'm really exerting myself, and if I just wear my contacts and the goggles, no problems at all.

As for amber vs. grey, it's certainly true that different color lenses work better for different weather conditions. Amber is said to bring out the texture and snow surface when the light on a cloudy day is really flat and otherwise shadowless. I find it very useful to have different color lenses for my ski goggles. But for hiking it doesn't make as much of a difference to me. I'm only walking at 2-3mph and a small bump in the snow isn't going to matter to me on foot or snowshoe like it will if I'm flying down the mountain on my skis.

Polarized lenses, however, are definitely the way to go. And not just for hiking or skiing, but all the time. The way they cut out glare from the ground, be it snow or pavement, is just wonderful and will take a lot of stress off your eyes.