Letitia Lamdin and Andrew Feyi-Waboso look at Charles Bonnet syndrome, a condition of which eye care practitioners have only just seen the tip of the iceberg and which is a serious cause of distress among visually impaired patients
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In 1760, the Swiss naturalist and philosopher Charles Bonnet wrote about his visually impaired, psychologically sound, grandfather experiencing detailed visual hallucinations: 'I know a respectable man full of health, of ingenuousness, judgement and memory, who, completely alert and independently from all outside influences, sees from time to time, in front of him, figures of men, of women, of birds, of carriages, of buildings etc.'1
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