Response of the Pupil to Steady-State Retinal Illumination: Contribution by Cones

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Science  27 Aug 1965:
Vol. 149, Issue 3687, pp. 989-991
DOI: 10.1126/science.149.3687.989


Response of the pupil to steady-state retinal illumination was measured in an observer who lacked functioning rods. At high intensities, this response was as great as that of a normal eye. These results cannot be explained by the hypothesis that only rods are receptors for the steady-state response.