二色视觉是指眼睛只通过两种类型的视锥细胞观察事物。具有二色视觉的生物被称为二色视者。二色视者可见的色域由两种类型的视锥细胞共同决定。人类一般是三色视者，若是有人是二色视者，那他就属于色觉缺陷患者，此时他眼睛中的三种类型的视锥细胞中有一种缺失或不起作用。[1]
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