The report concerns a discussion of some methodological and statistical problems in testing color vision with the Nagel anomaloscope and an evaluation of records compiled during a period of four and a half years’ research work at the U. S. Air Force School of Aviation Medicine, Randolph Field, Texas. Following topics are dealt with: elimination of training effects and determination of the total number of readings required to detect specified minimum practical differences between individuals; application and frequency distribution of the anomalous quotient; determination of the normal matching range of mixtures and of comparison yellow; and test-retest reliability of the Nagel anomaloscope.
INGEBORG SCHMIDT, "Some Problems Related to Testing Color Vision with the Nagel Anomaloscope," J. Opt. Soc. Am. 45, 514-521 (1955)