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The authors treat the question of color-blindness from the practical points of view of army, marine and railway requirements. After discussing the theories of the color sense and classifying color disturbances, they describe a variety of tests, emphasizing the necessity of using several tests to avoid errors. Nagel's and Stillings' methods are recommended especially.
Diagnostik der Farbensinnstörungen. JAMA. 1913;60(16):1256. doi:10.1001/jama.1913.04340160058046
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