COMPARISON AND EVALUATION OF AMERICAN OPTICAL CO. PSEUDO-ISOCHROMATIC PLATES, FIRST AND SECOND EDITIONS
Final rept. (First)
NAVAL MEDICAL RESEARCH LAB NEW LONDON CT
Pagination or Media Count:
A group of 510 men was examined on American Optical Company Pseudo- Isochromatic Plates, first and second editions, for the purpose of comparing the two editions especially with respect to their effectiveness in distinguishing between color-normal and color-anomalous individuals. The two editions were shown to be of approximately equal validity in detecting defective color vision. The second edition, even after modification, was found to contain several plates too difficult for normals. When these were corrected, the revised second edition proved to be superior to both the first and second editions in dichotomizing between normal and anomalous color vision. The tests are effective when scored on the basis of the number of plates failed or passed out of the total. An interpretation based on the number of plates failed or passed in each color group does not effectively segregate the color normal from the color anomalous. The two editions were compared with respect to the time necessary to complete the test, and the difference proved to be negligible. Sixteen men with anomalous color vision attempted to memorize both editions of the plates. The second edition proved increasingly more difficult to memorize as the degree of color deficiency increased. Three severely defective color blinds learned the first edition but were unable to learn the second edition.
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