daltonism

Noun capitalized: Daltonism

Daltonism (uncountable)

1. An inability or defective ability to perceive or distinguish certain colors, especially red-green color blindness.
   • A person with Daltonism may be said to lack a discriminatory power that others have: his perceptions of red and green are, as such, not to be relied on.2002, Richard Davies, Descartes: Belief, Scepticism and Virtue, page 25
   • The Ishihara plates were developed for the assessment of congenital colour anomalies (Daltonism) and so there is considerable detail in the testing that is not relevant to optic nerve disease where the losses do not follow the specific patterns seen in Daltonism but show largely global losses.2011, Gordon Plant, James Acheson, Charles Clarke, Elizabeth Graham, Robin Howard, Simon Shorvon, “13: Neuro-Ophthalmology”, in Charles Clarke, Robin Howard, Martin Rossor, Simon D. Shorvon, editors...

   Synonyms:

   color blindness, dichromatism

2. Achromatopsia.