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Related Experiment Videos

'Rebound-saccade' in the prism cover test.

E Mehdorn, G Kommerell

    International Ophthalmology
    |September 1, 1978
    PubMed
    Summary

    In strabismus patients, a novel "rebound-saccade" occurs when prisms correct eye alignment. This indicates extraretinal information, not just retinal correspondence, guides fixation switching in alternating strabismus.

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    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Vision Science

    Background:

    • Squinting patients exhibit saccades when the fixing eye is covered, aligning with retinal image eccentricity.
    • Some strabismus patients show an unexpected saccade even with prism-induced foveal fixation.

    Purpose of the Study:

    • To introduce and define the 'rebound-saccade' phenomenon in alternating strabismus.
    • To investigate the underlying mechanisms of fixation switching in strabismus.

    Main Methods:

    • Observation of saccadic eye movements in strabismus patients.
    • Use of prisms to manipulate retinal image position.
    • Analysis of fixation behavior during eye-tracking.

    Main Results:

    • A saccade was observed that moved the eye to the primary position, displacing the target image peripherally.
    • A subsequent saccade was required to re-center the image onto the fovea, termed the 'rebound-saccade'.
    • This rebound-saccade suggests extraretinal information, related to the angle of squint, influences fixation alternation.

    Conclusions:

    • The 'rebound-saccade' phenomenon provides new insights into the control of rapid eye movements in alternating strabismus.
    • This finding challenges explanations solely based on anomalous retinal correspondence.
    • Extraretinal signals play a crucial role in coordinating fixation between eyes in strabismus.

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