Just got back from a 3-day attempt on Mt. Shasta with my 13-year-old daughter. On the first day, she slipped on snow and broke one of the arms off of her glasses, losing the screw in the snow. I was able to do a makeshift repair by stripping the wire out of a twist-tie, and although it held, it wasn't so great.
Any advice on this? Are the screws in eyeglasses totally standard, so that one can just take one or two spares on a hike? If so, where do you buy them?