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Contrast visual testing in neurovisual diagnosis.

R W Lorance, D Kaufman, S H Wray

    Neurology
    |June 1, 1987
    PubMed
    Summary
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    Contrast visual testing (CVT) and pattern visual evoked response (PVER) show varying diagnostic capabilities for neurovisual disorders. While both detect subclinical dysfunction, neither provides specific etiological diagnoses.

    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Clinical Neurophysiology

    Background:

    • Contrast visual testing (CVT) is a psychophysical method with an unclear diagnostic role in neurovisual disorders.
    • Pattern visual evoked response (PVER) is a common electrophysiological test for visual pathway assessment.

    Purpose of the Study:

    • To compare the diagnostic sensitivity of CVT and PVER in various neurovisual disorders.
    • To evaluate the utility of CVT and PVER in distinguishing between specific conditions and identifying non-organic visual loss.

    Main Methods:

    • CVT and PVER were performed on 32 controls and 39 patients with diagnosed neurovisual conditions.
    • Results from CVT and PVER were compared for sensitivity in detecting visual dysfunction across different patient groups.

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    Main Results:

    • CVT was more sensitive than PVER for pseudotumor cerebri and subclinical optic neuritis, and potentially for differentiating papilledema.
    • PVER was more sensitive than CVT for multiple sclerosis (MS) and optic nerve compression.
    • Neither test was abnormal in asymptomatic Leber's optic neuropathy; CVT was variable in non-organic visual loss, while PVER was normal.

    Conclusions:

    • Both CVT and PVER can detect subclinical visual dysfunction in specific neurovisual disorders.
    • Neither CVT nor PVER offers specific etiological diagnostic information independently.
    • The choice between CVT and PVER may depend on the suspected neurovisual condition.