“…I have been able to locate only 9 articles dealing with color blindness in these populations [3,5,7,9,11,16,17,20,21] and 3 with visual acuity [9,11,21]. The present communication furnishes additional data about these characteristics in two populations of Brazilian Cayapo Indians; it is related to a series of other papers which have dealt with selected aspects of the health, demography, morphology and genetic polymorphisms of these Indians [4,12,13,18,19,22],…”