EFFECT OF QUALITY OF ILLUMINATION ON THE RESULTS OF THE ISHIHARA TEST

Abstract

THIS is the third in a series of reports dealing with the Ishihara test for color blindness. In the first of these reports¹ the fifth edition of the test was evaluated as a means of detecting and analyzing defective color vision. The data reported were collected during the course of a study of 106 persons having defective color vision of varying types and amounts, including 74 who had definite defects in color vision and 32 who had low, but normal, color vision. To study these persons a comprehensive battery of color tests² was used, some of which are well known in the field of color blindness testing and some less well known ; some have been devised in this laboratory. The fifth edition of the Ishihara test, one of the best known of the shorter editions, was selected for inclusion in the battery of tests. The results obtained from