An account of twenty years’ work on the electrical responses of the retina, a discussion of visual purple and visual violet, and an exposition of Granit’s hypothesis of colour vision. His researches have done much to elucidate the mechanism of visual processes.

In 1967 Granit shared the Nobel Prize in Physiology or Medicine with Hartline (No. 1532) and G. Wald (No. 1535) "for their discoveries concerning the primary physiological and chemical visual processes in the eye."