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[The optically evoked orbicularis oculi reflex: method, normal values, habituation].

J P Malin

    EEG-EMG Zeitschrift Fur Elektroenzephalographie, Elektromyographie Und Verwandte Gebiete
    |September 1, 1982
    PubMed
    Summary
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    The optically evoked orbicularis oculi-reflex (OOR) is intensity-dependent but not influenced by pupil size or eye closure. This reflex is less common in older individuals and habituates quickly to repeated light stimuli.

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Physiology

    Context:

    • The orbicularis oculi muscle plays a crucial role in eye protection.
    • Understanding reflex responses to visual stimuli is vital for neurological and ophthalmological assessments.
    • The optically evoked orbicularis oculi-reflex (OOR) provides insights into trigeminal and facial nerve pathways.

    Purpose:

    • To investigate the optically evoked orbicularis oculi-reflex (OOR) in healthy volunteers.
    • To determine the influence of stimulus intensity, pupil diameter, age, and eye closure on OOR parameters.
    • To assess the habituation characteristics of the optically evoked OOR.

    Summary:

    • Optically evoked OOR latency, amplitude, and duration correlated with stimulus intensity but not pupil diameter or eye closure.

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  • The reflex was unevoked in 12% of volunteers, predominantly older individuals, suggesting age-related changes.
  • Rapid habituation occurred with aperiodic and 1 Hz stimulation, requiring 30s intervals to prevent it. Reflex parameters varied with flash distance.

    • Impact:

    • This study differentiates the OOR from other visually triggered eyelid responses based on latency.
    • Findings contribute to normative data for the optically evoked OOR, aiding clinical diagnosis.
    • Understanding OOR habituation and age-related changes can refine neurophysiological testing protocols.