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Abnormal visual evoked potentials in myotonic dystrophy.

P S Gott, D S Karnaze, J R Keane

    Neurology
    |December 1, 1983
    PubMed
    Summary
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    Pattern-shift visual evoked potentials (VEPs) reveal visual pathway disturbances in myotonic dystrophy patients. Over half showed VEP abnormalities despite normal vision, indicating potential subclinical visual system involvement.

    Area of Science:

    • Neuro-ophthalmology
    • Neurology
    • Genetics

    Background:

    • Myotonic dystrophy is a multisystem disorder with potential ocular manifestations.
    • Visual evoked potentials (VEPs) assess the integrity of the visual pathway from the eye to the occipital cortex.

    Purpose of the Study:

    • To investigate visual pathway function in patients with myotonic dystrophy using pattern-shift VEPs.
    • To determine the prevalence of VEP abnormalities in this patient cohort.

    Main Methods:

    • Pattern-shift visual evoked potentials (VEPs) were recorded in 17 patients diagnosed with myotonic dystrophy.
    • Ocular health and visual acuity were assessed in all participants.

    Main Results:

    • Abnormalities in VEP latency or amplitude were detected in 10 out of 17 patients (59%).

    Related Experiment Videos

  • These VEP abnormalities occurred despite the absence of apparent retinal or significant ocular pathology.
  • All patients maintained a visual acuity of 20/30 or better.

    • Conclusions:

    • A significant proportion of myotonic dystrophy patients exhibit subclinical visual pathway dysfunction.
    • VEP testing can identify visual system abnormalities not evident through standard ophthalmological examination.
    • The bilateral nature of most VEP abnormalities suggests a central nervous system origin, though precise localization remains challenging.