THE PSEUDOISOCHROMATIC PLATE TEST OF COLOR VISION

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Abstract
That there is such a condition as color blindness is appreciated by most physicians. Industries have long realized the importance of good color perception, and many, such as the railroads, color printers and paint manufacturers, have made use of tests for the detection of color blindness among employees. But what is not appreciated by many physicians is the fact that almost one out of every ten men has a deficient color sense and that the time-honored method of testing color vision in routine physical examinations by having the subject identify the colors of a half-dozen wool yarns not only is totally inadequate but indeed may be actually dangerous. Adequate testing for deficiency in color vision is important not only to the more than 4,0001 American physicians devoting full or part time to industrial practice but to family physicians, who are often called on for preschool and precollege examinations, in

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