dichromacy

This term is a technical medical descriptor used primarily in ophthalmology and genetics. It carries a neutral, clinical tone and is used to specify a precise physiological condition rather than a general lack of color vision. In a clinical setting, it is often contrasted with monochromacy (total color blindness) or trichromacy (normal vision).

As a medical condition referring to a specific physiological state, the term is treated as an uncountable noun. It describes the state of the condition itself rather than individual instances of the disorder, meaning it does not typically take a plural form in standard medical discourse.