Based on this page[1], it looks like they provide the machine and training required to produce the glasses on-site in remote locations by locals so that they can operate their own businesses. This makes a lot of sense, because it's a lot cheaper to deploy X quantity of materials required to produce the glasses all at once vs hundreds of individual glasses. Also, it helps boost their local economies.

[1]: http://www.onedollarglasses.org/the-glasses/production-on-si...