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Related Experiment Videos

Recording the pattern electroretinogram: a cautionary note.

W H Seiple, I M Siegel

    Investigative Ophthalmology & Visual Science
    |June 1, 1983
    PubMed
    Summary
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    Pattern electroretinogram (PERG) signals can be detected in an occluded eye due to cross-talk from the fellow eye. This distant potential can mislead results, emphasizing the need for proper eye occlusion during PERG testing.

    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Physiological measurement

    Background:

    • Pattern electroretinogram (PERG) is a diagnostic tool used to assess retinal function.
    • Accurate PERG recordings require minimizing artifactual signals.
    • Ocular occlusion is a common practice in visual field testing but its effect on PERG is not always considered.

    Purpose of the Study:

    • To investigate the phenomenon of referred electroretinogram potential in an occluded eye.
    • To determine the impact of contralateral eye activity on PERG recordings.
    • To highlight potential sources of artifact in PERG measurements.

    Main Methods:

    • Recording pattern electroretinograms (PERGs) with the active electrode placed on an occluded eye.
    • Utilizing high amplification and sensitive signal retrieval techniques.

    Related Experiment Videos

  • Comparing PERG amplitudes with ipsilateral ear referencing versus other referencing methods.

    • Main Results:

    • Near-normal amplitude PERGs were recorded from an occluded eye.
    • A distant potential from the unoccluded eye was identified as the source of the signal in the occluded eye.
    • Ipsilateral ear referencing reduced, but did not eliminate, the referred potential.

    Conclusions:

    • Contralateral eye signals can contaminate PERG recordings when the active electrode's eye is occluded.
    • Referred potentials may lead to misinterpretation of visual function, particularly in cases of unilateral visual impairment.
    • Complete occlusion of the non-test eye is crucial for accurate PERG assessment.