Study on Color Discrimination for the Subjects of Congenital Color Deficiency

ABSTRACT

A total of 75 subjects were examined using Hahn's color vision test and Hahn's Double 15-Hue test. Among the 75 subjects, 62 subjects detected by screening test among 2700 high school students had defective color vision but good visual acuity and no retinal diseases. The other 13 subjects were detected in out-patient ophthalmic clinic. Results of examination in classifying the types and estimating the extent of color defects were obtained. 1. In the total 75 persons examined, extent of the color defects were as follows; mild ............ 6 cases, moderate.........31 cases, strong...........38 cases. 2. The classification of types of congenital color defects were as follows; Protan .........2 cases, Deutan ........25 cases, Unclassified...48 cases. Lack of advanced study on color discrimination for congenital color deficiency resulted in existing job discrimination against a color defective person by restricting his/her job opportunity. Therefore this kind of research has very important meanings and should be continued.