Adaptive Regulation of Accommodative Vergence Interactions

  • Clifton Schor
Part of the Perspectives in Vision Research book series (PIVR)


The near-visual response consists of concomitant changes in accommodation, vergence, and pupil size. All three of these motor systems share a common organization of phasic-tonic control that characterizes their transient and sustained motor responses. This dual-control organization for accommodation and vergence is indicated by their open-loop decay time constants, which increase with closed-loop stimulus duration (Schor, 1979; Schor et al., 1986a). A phasic-tonic organization of pupil control has also been interpreted from observations of pupillary escape, which occurs with large but not small initial pupil size (Sun and Stark, 1983).


Temporal Frequency VISUOMOTOR Adaptation Fixation Disparity Interpupillary Distance Ramp Stimulus 
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Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • Clifton Schor
    • 1
  1. 1.School of OptometryUniversity of CaliforniaBerkeleyUSA

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