Monochromatic color vision

Japanese: 一色型色覚 - いっしょくがたしきかく
Monochromatic color vision

...There are congenital and acquired cases, but the majority are congenital, resulting from a malfunction of color vision.
[Congenital color blindness]
Color vision is classified as monochromatic, dichromatic, or anomalous trichromatic. Monochromatic vision is when one can only distinguish one color, which corresponds to total color blindness or total color weakness, while dichromatic vision is also called partial color blindness, and includes red-green color blindness and blue-yellow color blindness.

*Some of the terminology that refers to "monochromatic color vision" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…先天性と後天性のものがあるが,大部分は先天性のもので,これは色覚の機能不全による。
[先天性の色覚異常]
 一色型色覚,二色型色覚および異常三色型色覚に分類される。一色型色覚は1色しか判別できないもので,いわゆる全色盲,全色弱がこれにあたり,二色型色覚は部分色盲ともいわれ,赤緑色盲および青黄色盲が含まれる。…

※「一色型色覚」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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