A failure of the red-sensitive nerves in the eye to respond to light properly causes
A. farsightedness.
B. astigmatism.
C. color blindness.
D. chromatic aberration.

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Neuron
A failure of red-sensitive nerve cells in the eyes to respond to light properly will cause color blindness - c. 

This is a clasic definition of what causes color blindness as this condition wil occur when one type of nerves; specific for a certain color, will stop working. 
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