Forbes: Eyeglasses are as old as the Renaissance, but even now we still need trained professionals to fit them. That’s no problem for the Western world, which has around one optometrist for roughly every 10,000 people. But it’s a nightmare for developing countries. In sub-Saharan Africa, for example, there’s only one optometrist for around 1 million people. The solution, according to retired Oxford University physicist Josh Silver, is a neat pair of self-adjustable specs that obviates the need for white-coated experts–and he wants to bring them to 1 billion people by 2020.”