Josh Silver, Center for Vision in the Developing World
Although in many parts of the developing world physical access to the glasses is expensive and rare, this is a solvable problem. Glasses can be made inexpensively and plentifully, and are already being supplied like this worldwide.
The major problem to overcome is a lack of personnel to fit them. Highly trained optometrists are very rare in many parts of the developing world, and often leave to work in countries where their skills will bring them better pay.
The Adspec glasses propose a very interesting solution.