February 2009
More than 153 million people around the world with poor or no eyesight either don't have access to or can't afford vision correction, according to the World Health Organization (WHO).
A British physicist wants to solve that problem.
He has his sights set on the lofty goal of distributing one billion pairs of glasses, at $1 a pair, by 2020.
The glasses, developed by Josh Silver, are round plastic frames with lenses made of clear sacs of silicon oil sandwiched between two clear plastic circles.
They work on the same principle that the human eye and traditional glasses do; as the curve of the lens changes, so does its power.
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