Supplying glasses for the world's poor may be one of the most valuable investments around. Hundreds of millions of people -- some put the estimates as high as two billion -- do not have the corrective lenses that would allow them to lead better, more productive lives.
Efforts are under way to find a means of distributing inexpensive glasses on a wide scale. At least three organizations are now offering their own versions of low-cost adjustable spectacles, which let untrained wearers set the right focus themselves in less than a minute, greatly reducing the need for trained optometrists.
Full story from New York Times.