[The prevalence of color blindness in Senegal in a population of 4500 workers]

The prevalence of colour-blindness differ according to the ethnic groups. The authors are hereby presenting the rates of prevalence observed among 4,500 workers of an agro-industrial project in Senegal. This population is composed of three main ethnic groups, namely Ouolof, Peulh and Toucouleur. The rates are compared to those observed in other African ethnic groups, as well as non-African. The differences between ethnic groups are confronted to the anthropological hypothesis given by Post.