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Up to half a million people in the UK could have it, but it's a condition that hardly anybody has heard about: Charles Bonnet Syndrome. It happens to people who are losing their sight through age-related macular degeneration, cataracts, diabetic eye problems or glaucoma. They see vivid and often frightening visual hallucinations and these images are soundless. Dr Mark Porter investigates. First broadcast on Inside Health, 24 February 2016.