Abstract
Comparison of the threshold of the dark-adapted human retina with the rate of photic emission demonstrated by Russian authors at the surface of living mammalian tissues shows that such a level of emission if occurring in the retina would be insufficient to excite the photoreceptors and ganglion cells. This type of bioluminescence is therefore not in conflict with the present writers' previous finding that if any light is generated in the eye it is too weak to produce a subjective visual response.
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