Frequencies of Different Types of Colour Vision Defects in the Netherlands

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Abstract
Two different population samples in Holland – one consisting of 1,093 boys from a technical school and the other of 493 male and 416 female students – were analysed for the presence of red-green colour vision defects. A total percentage of 7.3 for the male population was found. Based on the combined results of the Ishihara and HRR pseudoisochromatic plates, the Farnsworth 15-hue test and the anomaloscope, a subdivison of the deuteranomalous individuals into 3 subgroups is made. It is suggested that the differences between these groups may be genetic in nature and that the actual number of different genetic entities may still be greater.

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