What to do with old prescription glasses ?

I recently got my eyes checked and they had degraded quite a bit since my last prescription. I got new glasses (transition bifocals, which are f’n amazing by the way) and now I have about 4 pairs of old prescription glasses, some clear and some sun glasses. They are Ray-ban brand I don’t want to just throw them out. Does anyone have any recommendations on what I can do with them to give them a second life?