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The two-quanta explanation of the dependence of threshold values on the visual angle and the time of observation



The two-quanta explanation of the dependence of threshold values on the visual angle and the time of observation



Documenta Ophthalmol 3: 324-327



The exptl. confirmation of the 2 quanta theory of van der Velden for rod vision is presented. Three methods for the detn. of the number of quanta effectively absorbed by the visual purple and necessary for light perception are discussed. Apparently 2 quanta must be absorbed within a small area of the peripheral retina and within a small time. The laws of Ricco, Piper and Bunsen-Roscoe for the behavior of threshold values are based on this fact.

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