University of Illinois

Richard Kast

Kirk S Schroeder

Chester S Gardner

Method and apparatus are disclosed for determining pupillary response parameters, such as latency, time of acceleration of constriction, and speed of constriction. In a form of the disclosed method a signal is derived which is representative of measured pupil size as a function of time after a visible light stimulus. The signal is modified to remove therefrom artifacts due to eye movement. Pupillary response parameters can be obtained from the modified signal. In a preferred embodiment, the modifying of the signal includes fitting curves to different portions of the signal, correcting at least one of the fitted curves, and deriving the modified signal from the curves, as corrected.

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Barrow, AK, United States of America

Richard Kast