Retinitis pigmentosa (RP) is a degenerative eye disease that affects 200,000 people in the United States and Europe and has left 15 million people permanently blind worldwide. German biotechnology firm Retina Implant AG has developed a microchip that provides a useful degree of artificial vision in patients who have been blind for even long periods. The 3 x 3 mm (0.118 in) chip is implanted below the surface of the retina where it electrically stimulates the optical tissues. After successful clinical trials in Germany, the chip is now being tested in Hong Kong and Britain before moving on to planned trials in the U.S.
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