Whereas our normal, bright-light photopic vision is produced by three types of color-sensitive cone cells, dark scotopic vision is produced by the eye's rod cells, which are great at sensing something's brightness, but can't discriminate different colors.

我们正常的亮光视觉是由三种对颜色敏感的视锥细胞产生的，而暗视觉是由眼睛的杆状细胞产生的，它们非常擅长感知事物的亮度，但不能区分不同的颜色。