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Recent investigations report abnormal colour vision function in Parkinson's disease (PD). The authors performed the Farnsworth-Munsell 100 Hue-Test in 60 Parkinsonian patients and 60 age- and sex-matched controls in order to determine the ability of colour discrimination in PD in correlation with clinical data. Further ophthalmological findings of these subjects were normal. The mean total error score (TES) in Parkinsonian patients was significantly elevated as compared to controls (89.4 to PD versus 16.8 in controls). TES was positively correlated with the duration and severity of the disease but not with depressive symptoms or treatment. It can be concluded that the colour discrimination in PD is impaired as compared to normal subjects. This dysfunction may be closely related to the pathophysiology of Parkinsonism.