I switched from glasses to contact lenses for walking and ski trips for the same reason as others. With contacts I can use any dark glasses or goggles I want, including serious wrap-arounds in the snow and rugged ones in the bush. And with contacts I don't get fogged glasses under the goggles - a problem which can be rather dangerous in my experience. (Skied over not one but two small cornices with fogged glasses ...)
I use the J&J Acuvue Moist soft daily disposables. I found they were available across Europe as well, although I had enough with me. Very convenient.
I do store them inside my quilt at night when in the snow. I started doing that after I found ice-sludge in the packet one morning! Putting them in my eyes is no problem, even on the coldest mornings. They are warm enough from sleeping with me, and my fingers are warm enough from being inside my quilt as well. I mean, if you can't keep your fingers warm overnight and during breakfast, then you really are doing something wrong!
Works for me.