vision

Hallucination, Illusion or Misinterpretation?

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Most people viewing this pattern feel visually uncomfortable and disorientated because it’s designed to make you feel that way. Now imagine feeling like that all the time, as though every surface has that pattern on it. To a person with dementia changes in colour, or shadows on a path,  or the pattern on wallpaper can produce the same effect. The world can be a visually terrifying and uncomfortable place for them. Continue Reading →

Oliver Sacks

Oliver Sacks

I was saddened to read of the death of the wonderful Oliver Sacks today. He announced in February that he had terminal cancer. He was a brilliant neurologist and speaker and I enjoyed his books and lectures. Visual hallucinations are very common among the mainly elderly patients I examine in practice. Often these patients are too frightened to admit to them unless questioned directly. The perception among the general public is that hallucinations = going mad. In fact some 10% of visually impaired people experience hallucinations and these have a name; Charles Bonnet Syndrome. Oliver Sacks himself was visually impaired and experienced these hallucinations first hand. Continue Reading →