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Water-based eyeglasses

Josh Silver’s water-based eyeglasses use pockets of fluid to hopefully improve the vision, and lives, of millions of people around the world. The ease of adjusting them is a particular advantage:

Silver calls his flash of insight a “tremendous glimpse of the obvious”–namely that opticians weren’t necessary to provide glasses. This is a crucial factor in the developing world where trained specialists are desperately in demand: in Britain there is one optometrist for every 4,500 people, in sub-Saharan Africa the ratio is 1:1,000,000.

Great idea.