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Title: Charles Bonnet syndrome in Asian patients in a tertiary ophthalmic centre
Authors: Tan, C.S.H.
Lim, V.S.Y.
Ho, D.Y.M.
Yeo, E.
Ng, B.Y.
Eong, K.G.A. 
Issue Date: Oct-2004
Citation: Tan, C.S.H., Lim, V.S.Y., Ho, D.Y.M., Yeo, E., Ng, B.Y., Eong, K.G.A. (2004-10). Charles Bonnet syndrome in Asian patients in a tertiary ophthalmic centre. British Journal of Ophthalmology 88 (10) : 1325-1329. ScholarBank@NUS Repository.
Abstract: Aims: To describe the epidemiology of Charles Bonnet syndrome (CBS) among patients in an Asian tertiary ophthalmic centre and to describe the characteristics of the hallucinations experienced. Methods: 1077 consecutive patients aged 50 years and above were asked a standardised question to determine if they had ever experienced formed visual hallucinations. All patients who experienced these symptoms were further interviewed using a detailed, standardised questionnaire to ascertain if they met the diagnostic criteria established for CBS. Results: There were 491 men (45.6%) and 586 women (54.4%). The best corrected visual acuity ranged from 20/20 to light perception in the better seeing eye and from 20/20 to no light perception in the worse seeing eye. Four patients (0.4%) were diagnosed with CBS; two men and two women. There were two Chinese and two Indians. The average age of the CBS patients was 76.3 years (range 65-90 years). Two patients had cataracts, one had glaucoma, and one had both cataracts and glaucoma. A wide variety of visual hallucinations were reported. Three out of four patients experienced a negative reaction to their hallucinations. Only one patient had discussed his symptoms with a doctor. Conclusions: This is the first report on the epidemiology of CBS in Asian patients. The prevalence rate of CBS (0.4%) is slightly lower than in comparable studies in non-Asian populations. The nature of the hallucinations experienced were similar to those previously reported.
Source Title: British Journal of Ophthalmology
ISSN: 00071161
DOI: 10.1136/bjo.2004.041947
Appears in Collections:Staff Publications

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