[MichaelJ]

Excellent question! Mine are amber. My choice of goggle was entirely influenced by having a pair that could fit over my glasses, since I don't always winter hike in contact lenses, so I didn't give much thought to the color as I could have my prescription sunglasses or regular glasses under them.

I think it matters a lot less to hiking than skiing, since you're moving at just a fraction of the speed and it's far less important to see the snow textures and contours. What's primarily important is as Mike says, face protection combined with other components to protect the skin and keep away frostbite in windy conditions, especially above treeline. I like to think of the goggles as weather protection, while really good sunglasses are important for being out there in nicer conditions. UV protection and minimal light passage in winter will really help you when out on a snowfield or above treeline on a sunny day.