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Intrasession variability of the full-field ERG.

Grant D Hochstein1, Fanni E Molnar, Michael F Marmor

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Full-field electroretinography (ERG) shows low intrasession variability for b-wave amplitude and implicit times. Understanding factors like flash intervals and adaptation periods can minimize this variability in clinical recordings.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Electrophysiology

Background:

  • Full-field electroretinography (ERG) is crucial for assessing retinal function.
  • Understanding variability in ERG measurements is essential for accurate clinical interpretation.
  • International Society for Clinical Electrophysiology of Vision (ISCEV) standards provide a framework for consistent ERG recording.

Purpose of the Study:

  • To quantify the intrasession variability of full-field ERG responses under ISCEV standards.
  • To identify clinical factors that contribute to variability in ERG measurements.
  • To establish a baseline for ERG variability in healthy subjects.

Main Methods:

  • Recorded ISCEV standard ERGs in nine healthy volunteers (aged 19-32).
  • Measured dark-adapted (standard combined) and light-adapted (cone) b-wave amplitudes and implicit times.
  • Manipulated interflash intervals and adaptation periods; measured stimulus flash stability.

Main Results:

  • Low coefficients of variability were observed: ~2.5% for standard combined b-wave amplitude, ~4.5% for cone b-wave amplitude.
  • ~2% for standard combined b-wave implicit time, ~1.25% for cone b-wave implicit time.
  • Interflash interval, adaptation times, and waveform anomalies influenced b-wave amplitudes.

Conclusions:

  • Intrasession variability in full-field ERG is significantly lower than previously reported intersession variability.
  • This baseline variability, though low, impacts ERG results.
  • Recognizing and controlling factors like adaptation and flash intervals can further minimize ERG variability.