Abstract
Routine examinations of the sense of color are becoming increasingly important both in connection with occupation in peaceful pursuits and in relation to the national defense. As often as not, a test of color vision must be made when a large number of examinees is present. Any reliable method of testing a sizable group at one time will confer an obvious boon and will naturally be applicable in situations in which a color vision test, though desirable, has not customarily been given because of lack of time or of sufficient examiners. An exact diagnosis of a given deficiency in color vision can be made only with a Nagel anomaloscope in the hands of an expert. But for practical purposes it usually suffices to be able to say deviation from normal trichromatic vision—unfit for special service. Such a diagnosis can be made simply and with a minimum of error with Stilling
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