Nagel test

(for color vision) one half of the field of an anomaloscope is illuminated with standard yellow and the subject must mix red and green until the second half matches the first.
Found on http://www.encyclo.co.uk/local/21001

Nagel test

Type: Term Pronunciation: nah′gĕl Definitions: 1. a test for color vision in which the observer determines the relative amounts of red and green necessary to match spectral yellow; an instrument called a Nagel anomaloscope is used.
Found on http://www.medilexicon.com/medicaldictionary.php?t=90686
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