Saccadic eye movements were studied in six subjects during two Space Shuttle missions. Reaction time, peak velocity and accuracy of horizontal, visually-guided saccades were examined preflight, inflight and postflight. Conventional electro-oculography was used to record eye position, with the subjects responding to pseudo-randomly illuminated targets at 0 deg and + or - 10 deg and 20 deg visual angles. In all subjects, preflight measurements were within normal limits. Reaction time was significantly increased inflight, while peak velocity was significantly decreased. A tendency toward a greater proportion of hypometric saccades inflight was also noted. Possible explanations for these changes and possible correlations with space motion sickness are discussed.


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    Title :

    Saccadic Eye Movement during Spaceflight


    Contributors:
    J. J. Uri (author) / B. J. Linder (author) / T. P. Moore (author) / S. L. Pool (author) / W. E. Thornton (author)

    Publication date :

    1989


    Size :

    13 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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