I find this discussion a little puzzling. I am a regular wearer of eyeglasses, such that I usually have a backup pair with me, either in the pack or in the briefcase. I can see large objects without them, but fine print is a hassle and I am an illegal driver at that point.

My favorite case is a hard shell nylon contraption that can hold two glasses plus cleaning cloths and the like. It gives excellent protection and weighs maybe two ounces (estimated). The security it gives my vision is well worth the weight. More conventional cases are even lighter