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Applied Optics

Applied Optics


  • Vol. 28, Iss. 6 — Mar. 15, 1989
  • pp: 1122–1127

Pupillary response: an index of visual threshold

Barbara E. Stewart and Rockefeller S. L. Young  »View Author Affiliations

Applied Optics, Vol. 28, Issue 6, pp. 1122-1127 (1989)

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The present study investigates the use of the afferent pupillary reflex as an objective index of a subject’s ability to detect a dim flash. The results support the general notion that the pupil responds to flashes near the absolute threshold for vision. In contrast to several previous studies, however, our results document that minute pupillary constrictions occur in response to small diameter (i.e., 3.5° and 1.2°) stimuli. These pupillary constrictions occur mostly on the trials when the subject also reported seeing the flash and little evidence of a response is found on the trials when the flashes were not detected. We infer that the sensitivity of the perceptual and pupillomotor pathways are very similar for the scotopic conditions tested.

© 1989 Optical Society of America

Original Manuscript: May 28, 1988
Published: March 15, 1989

Barbara E. Stewart and Rockefeller S. L. Young, "Pupillary response: an index of visual threshold," Appl. Opt. 28, 1122-1127 (1989)

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