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Related Experiment Videos

Pattern electroretinograms and visual-evoked potentials in glaucoma and multiple sclerosis.

P Bobak, I Bodis-Wollner, C Harnois

    American Journal of Ophthalmology
    |July 1, 1983
    PubMed
    Summary
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    This study found abnormal pattern electroretinograms in glaucoma patients and identified transient visual-evoked potential latency as key for diagnosing multiple sclerosis. These electrophysiological tests aid in differentiating these neurological conditions.

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Clinical Electrophysiology

    Background:

    • Glaucoma and multiple sclerosis are distinct neurological conditions affecting vision.
    • Accurate electrophysiological diagnostic tools are crucial for differentiating these diseases.

    Purpose of the Study:

    • To evaluate the diagnostic utility of steady-state visual-evoked potentials (ssVEP) and electroretinograms (ERG) in glaucoma and multiple sclerosis.
    • To compare the sensitivity of pattern ERG, homogenous field ERG, and transient VEP latency in these patient groups.

    Main Methods:

    • Simultaneous recording of ssVEP and ERG using homogenous field and sinusoidal grating stimuli (2.3 cycles/degree, 7.5 Hz counter-phase modulation).
    • Narrow bandwidth spectral analysis for response amplitudes and signal-to-noise ratios.

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  • Measurement of transient pattern visual-evoked potential (pVEP) latency at 1 Hz.

    • Main Results:

    • Abnormal pattern ERGs (absence of significant second harmonic) were observed in 3/4 glaucomatous eyes, with normal homogenous field ERGs.
    • Pattern ERGs were abnormal in 2/10 multiple sclerosis eyes.
    • Transient pVEP latency demonstrated the highest diagnostic yield, identifying abnormalities in 7/10 multiple sclerosis eyes.

    Conclusions:

    • Pattern ERG abnormalities may indicate glaucoma, even with normal homogenous field ERGs.
    • Transient pVEP latency is a sensitive indicator for visual pathway involvement in multiple sclerosis.
    • Combined electrophysiological assessments offer valuable differential diagnostic information for glaucoma and multiple sclerosis.