IN an earlier report on the Ishihara test for color blindness1 we presented a brief history of the test from the original edition, issued in 1917, to the last Japanese edition of which we have a record in this country, the ninth edition, issued in 1940. Mention was also made of the British reprint of the ninth edition, issued in London in 1943.
That report is the first of a series designed to evaluate in turn various color tests as means of analyzing and detecting defective color vision. The data reported were collected during the course of a study of some 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 tests was used ; some of these are well known in
LE GRAND H. HARDY, GERTRUDE RAND, M. CATHERINE RITTLER. TESTS FOR DETECTION AND ANALYSIS OF COLOR BLINDNESSII. Comparison of Editions of the Ishihara Test. Arch Ophthalmol. 1946;35(2):109–119. doi:10.1001/archopht.1946.00890200114004