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’.

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