Pupil movements to light and accommodative stimulation: a comparative study.

Abstract A comparison of the dynamic features of light-induced, and accommodatively-induced pupillary movement is used to isolate and define specific response components of these reflexes. When the complex nonlinear behavior of pupillary responses is quantitatively classified, two independent nonlinear processes emerge: a range dependent gain and a direction dependence or movement asymmetry. Since these nonlinear properties are seen in both the light reflex and near responses, they are attributed to motor processes. Construction overshoot and redilation is seen only in the light reflex and is, therefore, associated with sensory mechanisms. Comparison of light and near pupillary behavior for several different subjects showed consistently within a given subject suggesting intersubject variability is largely a result of variation in motor characteristics. Consequences and possible mechanisms for pupillary response characteristics quantitatively defined are discussed.

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