The influence of age and retinal illumination on the pupillary near reflex.

Abstract Photographic measurements were made of the human pupillary diameter when 12 subjects divided into four age groups viewed a target at different vergences and in two conditions of light adaptation. Systematic and statistically significant age factors were revealed. As the near reflex and the light reflex are antagonistic some attention to the question of retinal illumination is indicated. The results are explained most readily by assuming that the innervation to and or activity of, the dilating system of the ageing human iris is reduced' more quickly than is true of the mechanism of constriction.

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