Alex said:.... Problem with the plastic glasses is the plastic always gets scratched so in the end you don't see anything anymore. Happens just as fast with an expensive one as with an ultra cheap one...
Years ago I bought a bunch of carrying bags for safetyglasses, because I hated scratched glasses. Two of them are still in working order but I can't find the exact same ones anymore. They look a bit like these: link, but they are a bit different (a velcro flap instead of the zipper, and they have a stiff plastic insert inside (only on the side where the lenses go, and covered with soft material).
When I put the glasses on I hook the bag to a beltloop on my workpants, and without thinking I put them back when I take them off. (and I can keep it in my toolbox without getting the glasses scratched)