BBC NEWS | Science/Nature | Trials for 'bionic' eye implants: "About 1.5 million people worldwide have retinitis pigmentosa, and one in 10 people over the age of 55 have age-related macular degeneration.
Both diseases cause the retinal cells which process light at the back of the eye to gradually die.
The new devices work by implanting an array of tiny electrodes into the back of the retina.
A camera is used to capture pictures, and a processing unit, about the size of a small handheld computer and worn on a belt, converts the visual information into electrical signals."
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