The Intensity Factor in Vision and Radiation

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Abstract
The problem of intensity recognition is considered in terms of its relation to visual acuity. The visual acuity of man and of certain insects has been shown to vary in a specific manner with the intensity of light. These data are quantitatively explained in terms of the suppositions, first that the percipient elements in the eye vary in threshold, and second that visual acuity is proportional to the number of elements functional in a unit retinal area. It is demonstrated that the same suppositions are also capable of furnishing a detailed description of the capacity for intensity discrimination and recognition possessed by the eye.

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