Abstract
Twenty eight men were tested with two lanterns at a distance of two hundred and fifty meters in the day time, evening and night; according to method of “color-naming”. Of these, 10 were color normal and 18 color deficient according to Ishihara test and anomaloscope, Of the latter, 11 were classified deuterano and 7 protano.These were also tested with 3 pseudo-isochromatic tests of color vision (Ishihara, Oguchi and Okuma tests), anomalscope and Farnsworth-Munsell 100 Hue tests.
The results obtained on the lantern are as follows:1) The difference between color normal and deficient lies in the results that color deficient is apt to make different kinds of responses. 2) Incorrect responses were made to the yellow light more often, and white, red and green less often. 3) Protano confused more often one colored light with other colored lights than deuterano does. 4) The correlational technique were used to study the responses on lantern. That is, the pseudo-isochromatic tests correlate better with each other than they do with lantern. 5) The intercorrelation between the results on the lantern and Fransworth-Munsell 100 Hue test is not high, but the correlation coefficiency, to some extent, yields quantitative estimates of the amount of color defect.
The results of these studies show that the test on lantern is worthy for criterion of color deficiency.
