ONLINE ANALYSIS OF EYE-MOVEMENTS USING A DIGITAL-COMPUTER

  • 1 January 1980
    • journal article
    • research article
    • Vol. 51  (6) , 563-567
Abstract
A microcomputer system for on-line analysis of eye movements is described. Quantitative data from the patient and statistical comparison with normative data is available within seconds of test completion. Types [3] of eye movements are analyzed; voluntary saccades, smooth pursuit and nystagmus. The 1st two are induced by a computer-controlled laser dot projected onto a screen and the 3rd by a computer-controlled optokinetic drum, caloric infusion and rotatory chair. The computer algorithm differentiates the eye position signal to yield an instantaneous eye velocity. Saccades are identified based on their characteristic velocity profile. For pursuit and nystagmus, the velocity record is modified by linearly interpolating across segments in which saccades occurred. The gain (output eye velocity/input eye velocity) is calculated after Fourier analysis.

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