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Josh Silver demos adjustable liquid-filled eyeglasses

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I'd like to buy Josh Silver's adjustable liquid-filled eye glasses for myself. Where can I buy them ?
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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. Full bio »