There are millions of adults and children in developing countries without access to prescription eyeglasses and bifocal reading glasses. Uncorrected vision effectively renders them uneducated and unemployed, driving them even deeper into poverty. There are a number of charitable organizations that accept donations of used glasses, sort them by prescription, and ship them to people who cannot afford the luxury of good vision.
Lions Club International has been doing this good work for decades. Local branches of the Lions Club distribute eyeglass collection boxes to community buildings like libraries and schools. You can also mail eyeglasses to one of 18 Lions Eyeglass Recycling Centers worldwide.
New Eyes is another organization that distributes used eyewear to the needy. In addition to prescription eyeglasses and reading glasses in good condition, New Eyes accepts sunglasses, metal eyewear in any condition, and watches and jewelry that the organization sells to raise money.