Pupil dilatation and dark adaptation.

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Abstract
Evidence is considered that pupil size relative to light stimulation is under the control of fibers activated by cones in the central portion of the retina. In this expt. a series of measurements of pupil dilatation in 2 subjects during dark-adaptation following light-adaptation have been made by means of infra-red photography. The similarity in the increase of pupil area and of cone sensitivity during dark-adaptation is tentatively interpreted in terms of similar processes of recovery after constant excitation.

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