Fahrenkamp-Richner K
Klin Monbl Augenheilkd. 1976 Jan;168(1):128-34.
Varying degrees of deficient color perception along the Deutan axis within one family have been studied and presented. All seven family members exhibit manifest color blindness. The question of the phenotype among heterozygotic females is discussed on the basis of the data found by anomaloscope testing and the hue tests of Farnsworth D-15 and Farnsworth 100.