Quotation from: General Science

Written by: Bertha M. Clark


A snowy field stimulates equally all three sets of optic nerves--the
red, the green, and the blue. Lavender, which is one part blue and
three parts white, would stimulate all three sets of nerves, but with
a maximum of stimulation for the blue. Equal stimulation of the three
sets would give the impression of white.


A color-blind person has some defect in one or more of the three sets
of nerves which carry the color message to the brain. Suppose the
nerve fibers responsible for carrying the red are totally defective.
If such a person views a yellow flower, he will see it as a green
flower. Yellow contains both red and green, and hence both the red and
green nerve fibers should be stimulated, but the red nerve fibers are
defective and do not respond, the green nerve fibers alone being
stimulated, and the brain therefore interprets green.

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