Is there some place in Chiang Mai where old eyeglasses can be donated?

I have a bunch of them, with decent frames, and the frames can be useful given the high prices here. Maybe the lens too, I am not sure about that though. 

probably a temple, school, or simply leave them somewhere.  I've done all three.

 

Do you have any pictures?  I simply can't buy the cheap frames I see everywhere.  

My optician told me today that hospitals accept them as donations, which they share with children who need glasses but cannot afford them easily or at all.