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DataRay Inc. - ISO 11146-Compliant Laser Beam Profilers
Photonics Dictionary

color-defective vision

Situation in which the observer requires fewer than three independent stimuli to make color matches. Dichromats require only two stimuli and are classified as protanopes and deuteranopes (both red-green confusers) and tritanopes (yellow-blue confusers). Monochromats require only one stimulus and have no color vision.
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