132 BIOPHYSICAL CHARACTERISTICS OF THE EYE 



One must, therefore, conclude that no theory of color sensation is 

 deserving of consideration which is not built on the fact discovered by 

 Thomas Young, and confirmed by Helmholtz, that three radiant- 

 energy stimuli are sufficient as a physical cause to start the retinal 

 photochemical processes, which probably initiate the nerve impulses 

 transmitted along the optic nerve to the brain, and the result is an 

 experienced sensation called color vision. 



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