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Interocular amplitude and latency differences of pattern ERG and pattern VEP parameters.

Imre Fejes1, Péter Balázs Kocsis, György Benedek

  • 1*MD, PhD †MD ‡MD, DSc Department of Ophthalmology, Albert Szent-Györgyi Clinical Center, Faculty of Medicine, University of Szeged, Szeged, Hungary (IF, PBK, MJ); and Department of Physiology, Faculty of Medicine, University of Szeged, Szeged, Hungary (GB).

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Summary

Significant interocular differences exist in pattern electroretinograms (PERGs) and pattern visual evoked potentials (PVEPs). These variations are not linked to retinal anatomy, and ignoring them may lead to misinterpreting pathological processes.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Clinical Electrophysiology

Background:

  • Pattern electroretinograms (PERGs) and pattern visual evoked potentials (PVEPs) are crucial electrophysiological tests.
  • Understanding normal interocular variations is essential for accurate clinical interpretation.

Purpose of the Study:

  • To quantify normal interocular differences in PERG and PVEP amplitudes and peak times.
  • To assess if PERG and PVEP parameters show similar lateral dominance or eye-side distributions.

Main Methods:

  • PERGs and PVEPs were recorded in 77 healthy subjects following International Society for Clinical Electrophysiology of Vision standards.
  • A modified check size (0.5 degrees) was used for PERG to target macular ganglion cells.

Main Results:

  • Significant interocular differences were observed in both PERG (P50, N95) and PVEP (P100, N135) peak times and amplitudes (p < 0.001).
  • No significant correlation was found regarding eye dominance for PERG and PVEP parameters.

Conclusions:

  • A significant interocular difference exists in PERG and PVEP recordings.
  • This difference cannot be attributed to retinal anatomy or visual pathways.
  • Failure to account for interocular differences may lead to misdiagnosis in pathological conditions.