achromatopsia/ˈə.kɹɒ.mə.tɒp.siə/EtymologyFrom German Achromatopsie, from Ancient Greek ἀχρώματος (akhrṓmatos), from ἀ- (a-, “without”) + χρῶμα (khrôma, “color”), + -opsie. By surface analysis, a- + chromato- + -opsia.achromatopsia means Total color blindness; the total inability to distinguish colors due to the absence of cone cells in the eyes. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounTotal color blindness; the total inability to distinguish colors due to the absence of cone cells in the eyes.