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Related Experiment Videos

Functional paralysis of horizontal gaze.

B T Troost, E G Troost

    Neurology
    |January 1, 1979
    PubMed
    Summary

    A steelworker with a gaze defect could move their eyes normally, suggesting the issue was a spasm of the near reflex, not voluntary gaze control.

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    Area of Science:

    • Neuro-ophthalmology
    • Ophthalmology
    • Neurology

    Background:

    • Gaze palsy can present with various underlying causes.
    • Understanding the specific mechanisms of gaze deficits is crucial for diagnosis.

    Observation:

    • A 52-year-old steelworker presented with a consistent defect in leftward voluntary gaze.
    • Both saccadic and pursuit eye movements were affected.
    • Pupillary miosis occurred during attempted leftward gaze.

    Findings:

    • The gaze palsy was attributed to spasm of the near reflex.
    • Clinical eye movement testing revealed preserved horizontal eye movement abilities.
    • The defect appeared specific to "voluntary" leftward gaze.

    Implications:

    • This case highlights the importance of differentiating voluntary gaze from reflex-driven movements.
    • Spasm of the near reflex can mimic true gaze palsy.
    • Accurate diagnosis requires specialized eye movement testing and consideration of associated pupillary changes.

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