December 29, 2008 2:54 PM

Researchers' vision: restoring sight through artificial retinas

Scientists are testing artificial retinas that they hope can restore partial sight to people who've lost their vision to the most common causes of blindness. Retinitis pigmentosa, which ruins peripheral vision, and macular degeneration, which causes a blurred or blind spot in central vision, affect millions of people, especially the elderly.

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