noun Pathology.
color blindness ( def 2 ).
Also, achromatopia [ey-kroh-muh-toh-pee-uh] , achromatopsy [ey-kroh-muh-top-see] .

a-6 + chromat- + -opsia Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Medical Dictionary

achromatopsia a·chro·ma·top·si·a (ə-krō'mə-tŏp'sē-ə) or a·chro·ma·top·sy (ə-krō'mə-tŏp'sē)
A severe congenital deficiency in color perception, often associated with nystagmus and reduced visual acuity. Also called achromatic vision, monochromatism.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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