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Spontaneous fluctuations in pupil size are not triggered by lens accommodation
J D Hunter1, J G Milton, H Lüdtke
1Department of Neurology, University of Chicago Hospitals, IL 60637, USA.
Vision Research
|May 23, 2000
Abstract:
Fluctuations in pupil size and lens accommodation are measured concurrently under open loop conditions, constant illumination and far fixation. In 12/17 trials no correlation was measured between the fluctuations in pupil size and lens accommodation. For the remaining 5/17 trials no lag was observed between the changes in pupil size and lens accommodation indicating that this correlation does not arise as a consequence of a near response. These observations suggest that under conditions of constant illumination and far fixation, the supranuclear centers controlling the near response are not active.