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Loss in pattern-elicited electroretinograms in optic nerve dysfunction

J G May, J V Ralston, J L Reed

    American Journal of Ophthalmology
    |April 1, 1982
    PubMed
    Summary
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    Pattern electroretinograms (PERG) and visual-evoked potentials (VEP) can help diagnose optic nerve dysfunction. Absence of PERG responses may indicate loss of optic nerve function, aiding in diagnostic testing.

    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Visual Electrophysiology

    Background:

    • Assessing optic nerve function is crucial for diagnosing visual pathway disorders.
    • Electroretinograms (ERG) and visual-evoked potentials (VEP) are established electrophysiological tests.

    Observation:

    • Flash-elicited ERG and VEP were recorded in a patient with unilateral optic nerve dysfunction.
    • Pattern-elicited ERG and VEP were also recorded, comparing the affected and unaffected eyes.

    Findings:

    • Flash-ERG showed no significant difference between eyes, but flash-VEP was attenuated in the affected eye.
    • Pattern-ERG and pattern-VEP were absent in the affected optic nerve, while present in the unaffected eye.
    • Contrast sensitivity was suppressed but present in the affected eye, indicating residual pattern processing.

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    Implications:

    • Pattern-elicited electroretinograms (PERG) may be a sensitive indicator of optic nerve activity.
    • Absence of PERG responses could be diagnostic for optic nerve dysfunction.
    • Incorporating PERG into testing protocols may enhance the assessment of optic nerve health.