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Retinal prosthesis a potential boon for the blind (3:11) 

Aug. 16 - Researchers at Stanford University in California are developing a retinal prosthesis system they hope will one day give millions of blind people the ability to see again. The system has proved successful with rats but is designed ultimately for sufferers of degenerative retinal diseases like Retinitis Pigmentosa. Ben Gruber reports. ( Transcript )

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