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Charles Bonnet, Swiss naturalist and philosophical writer. In 1760 he described a condition now called Charles Bonnet Syndrome, in which vivid, complex visual hallucinations (fictive visual percepts) occur in psychologically normal people. (He documented it in his 87 year old grandfather, who was nearly blind from cataracts in both eyes but perceived men, women, birds, carriages, buildings, tapestries and scaffolding patterns.) Most people affected are elderly with visual impairments, however the phenomenon does not occur only in the elderly or in those with visual impairments; it can also be caused by damage elsewhere in their optic pathway or brain....
 
 
Charles Bonnet, Swiss naturalist and philosophical writer. In 1760 he described a condition now called Charles Bonnet Syndrome, in which vivid, complex visual hallucinations (fictive visual percepts) occur in psychologically normal people. (He documented it in his 87 year old grandfather, who was nearly blind from cataracts in both eyes but perceived men, women, birds, carriages, buildings, tapestries and scaffolding patterns.) Most people affected are elderly with visual impairments, however the phenomenon does not occur only in the elderly or in those with visual impairments; it can also be caused by damage elsewhere in their optic pathway or brain....

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