The term dyschromatopsia comes from the Greek words dus (bad), chromatos (coloured), and opsis (seeing). It tends to be used as a synonym for the term " dichromatism. Although not a true synonym for " colour blindness and " colour-vision deficiency, it is sometimes used as more or less interchangeably with these terms. In addition, the term dyschromatopsia has been used as a synonym for the term colour confusion, and as a term denoting an incomplete variant of " achromatopsia (i.e. the inability or strongly diminished ability to perceive colour).
References
Zeki, S. (1990). A century of cerebral achromatopsia. Brain, 113, 1721-1777.
Dictionary of Hallucinations. J.D. Blom. 2010.