Josh Silver delivers his brilliantly simple solution for correcting vision at the lowest cost possible -- adjustable, liquid-filled lenses. At TEDGlobal 2009, he demos his affordable eyeglasses and reveals his global plan to distribute them to a billion people in need by 2020.
Atomic physicist Joshua Silver invented liquid-filled optical lenses to produce low-cost, adjustable glasses, giving sight to millions without access to an optometrist.
Joshua Silver reckons that around half the world's population needs corrective eyewear, yet has no access to it. His ultra-utilitarian spectacle design relies on the principle that the fatter the lens, the more powerful it becomes. The lenses are filled with liquid, and can be adjusted to different strengths by adding or removing fluid from tiny syringes on each arm, then locked to the right strength.
More than 30,000 of his lenses have been distributed in 15 countries, and a new model will scale that number up to millions.
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