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Related Experiment Videos

The pattern electroretinogram (PERG) with contralateral corneal reference.

Y H Aldebasi1, N Drasdo, R V North

  • 1Department of Optometry and Vision Sciences, Cardiff University, P.O. Box 905, King Edward VII Avenue, Cardiff, Wales CF10 3YJ, UK.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|June 9, 2001
PubMed
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The contralateral corneal reference (CCR) electrode position yields larger pattern electroretinogram (PERG) amplitudes than the ipsilateral temporal reference (ITR). New normative ranges are needed for CCR to ensure accurate PERG testing.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Electrophysiology

Background:

  • The pattern electroretinogram (PERG) is crucial for assessing proximal retinal function.
  • The contralateral corneal reference (CCR) electrode is a potential alternative to the ipsilateral temporal reference (ITR) for monocular PERG recordings.

Purpose of the Study:

  • To compare the effect of CCR and ITR electrode positions on PERG signal amplitudes.
  • To evaluate the statistical significance of amplitude differences between CCR and ITR.

Main Methods:

  • Monocular PERG recordings were performed on 26 subjects using DTL nylon fibre electrodes.
  • High-contrast, 19-inch black-white checkerboard patterns reversing at 4 Hz were used as visual stimuli.
  • PERG signals were recorded using both CCR and ITR electrode configurations.

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Main Results:

  • PERG responses recorded with the CCR electrode position showed significantly larger amplitudes compared to the ITR position (P < 0.001).
  • The observed increase in amplitude with CCR is statistically significant, indicating a more robust signal.

Conclusions:

  • The CCR electrode position provides larger PERG amplitudes, suggesting improved signal detection for proximal retinal investigation.
  • Establishing new normative ranges for CCR is essential to prevent misinterpretation of results and avoid false negatives in clinical practice.