So many good suggestions here, both in the article and the comments! :) Our public library has Lions' Club boxes available to accept donations. Very convenient!

If you get metal frames, instead of the ugly plastic ones that break and crack in the wintertime, you can just order new lenses when you need a new prescription. It's also good to have a couple extra pairs of your last prescription, because you can keep the spare pair in your car's glove compartment, and one at your desk at work, in case your current pair gets broken.

always give my old ones to Vision Center when I get new lens.

I have a drawer of old glasses from my daughters childhood. I've kept them for some reason

Luckily I have a friend who is Lions' Club member. I even bring in readers, sunglasses and found glasses from where I work (after a period of time). This club is the best.