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[So-called internuclear ophthalmoplegias. Electro-oculographic study]

A B Safran, J Babel, G Gauthier

    Schweizer Archiv Fur Neurologie, Neurochirurgie Und Psychiatrie = Archives Suisses De Neurologie, Neurochirurgie Et De Psychiatrie
    |January 1, 1978
    PubMed
    Summary

    This study examined internuclear ophthalmoplegia without diplopia in three patients. Oculomotor changes, including nystagmus and saccadic dysmetria in reading movements, were recorded.

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    Area of Science:

    • Neuroscience
    • Ophthalmology

    Background:

    • Internuclear ophthalmoplegia (INO) is a common sign of neurological disease, typically associated with diplopia.
    • This study investigates INO in the absence of diplopia, a less common presentation.

    Observation:

    • Three patients with internuclear ophthalmoplegia but no diplopia were analyzed.
    • Oculomotor parameters, including nystagmus components and saccadic dysmetria, were meticulously recorded.
    • Differential speeds of abduction and adduction contralateral to the lesion were measured.

    Findings:

    • A consistent dysmetric component was identified in the saccadic, low-amplitude movements characteristic of reading.
    • This suggests a specific oculomotor deficit in fine, rapid eye movements in these patients.
    • The findings highlight a nuanced presentation of INO beyond typical horizontal gaze palsy.

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    Implications:

    • These findings may refine diagnostic criteria for internuclear ophthalmoplegia.
    • Understanding this specific oculomotor dysfunction could lead to targeted therapeutic strategies.
    • Further research into the neuroanatomical correlates of saccadic dysmetria in INO is warranted.