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Related Experiment Video

Updated: Feb 8, 2026

Electroretinogram Recording in Larval Zebrafish using A Novel Cone-Shaped Sponge-tip Electrode
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Improving the quality of electroretinogram recordings using active electrodes.

Yolanda Wong Ying Yip1, Tsz Chun Man1, Chi Pui Pang2

  • 1Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, China.

Experimental Eye Research
|June 17, 2018
PubMed
Summary

A new custom active electrode significantly reduces noise and improves signal quality for electroretinogram (ERG) recordings compared to standard passive electrodes. This active electrode enhances retinal function investigation by providing greater amplitudes and better reproducibility.

Keywords:
Active electrodesElectroretinogramRetinal functionSignal to noise ratio

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Electroretinogram (ERG) is a crucial diagnostic tool for assessing retinal function.
  • Traditional passive ERG electrodes can be limited by noise and signal quality.
  • Development of improved electrode technology is essential for more accurate retinal assessments.

Purpose of the Study:

  • To compare the electroretinogram (ERG) recording quality between a custom-built active electrode and a standard passive ERG electrode.
  • To evaluate signal-to-noise ratio, amplitude, and reproducibility of ERG responses using both electrode types.

Main Methods:

  • Scotopic and photopic ERG responses were recorded from five adult albino rabbits.
  • A custom-built active electrode with an integrated amplifier was used on one eye.
  • A standard passive ERG electrode was used on the contralateral eye for comparison.

Main Results:

  • The active electrode demonstrated significantly lower noise levels (p=0.009) compared to the passive electrode.
  • ERG signals were recorded at lower stimulation strengths with the active electrode.
  • The active electrode yielded significantly larger scotopic and photopic a-wave and b-wave amplitudes, with improved intra-observer repeatability, inter-sessions reproducibility, and reliability (lower CV, CR; high ICC).

Conclusions:

  • The custom-built active ERG electrode offers superior performance over standard passive electrodes.
  • Its reduced noise, increased signal amplitude, and enhanced reproducibility make it a better device for investigating retinal function.
  • This technology has the potential to improve the diagnostic accuracy and sensitivity of ERG testing.