Origin: Anc Greek α/α(= prefix that denotes absence) χρώμα/chroma(=color) + όψη/opsi(=look, face)
Coined: in 1957 by Blackwell HR, Blackwell OM "Blue mono-cone monochromacy: a new color vision defect" J Optical Soc
47: 338-341 America
Achromatopsia (ACHM), is a medical congenital color vision disorder which is characterized by the inability to perceive (distinguish) color and to achieve satisfactory visual acuity at high light levels (typically exterior daylight). People with achromatopsia are completely colorblind or nearly so.