The destruction of sight, wherever the injuries be sustained, followsthe same law: all colors are aﬀected in the ﬁrst place,and lose theirsaturation. Then the spectrum is simpliﬁed, being reduced to four andsoon to two colors; ﬁnally a grey monochrome stage is reached,although the pathological color is never identiﬁable with any normalone. Thus in central as in peripheral lesions ‘the loss of nervous substance results not only in a deﬁciency of certain qualities, but in thechange to a less diﬀerentiated and more primitive structure’.
Maurice Merleau-Ponty, Phenomenology of Perception
color, perception-of-reality, vision