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Published on: June 9, 2015
Evaluation of Electrical Performance and Properties of Electroretinography Electrodes
Tony T C Man1, Yolanda W Y Yip1, Frederick K F Cheung1
1Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Kowloon, Hong Kong.
Purpose:
The aim of this study was to evaluate and compare the electrical performance and properties of commercially available electroretinography (ERG) electrodes.
Methods:
A passive ionic model was used to measure impedance, noise, and potential drift in 10 types of ocular surface and skin ERG electrodes.
Results:
The impedance for silver-based ocular electrodes are generally lower (range, 65.35-343.3 Ω) with smaller phase angles (range, -6.41° to -33.91°) than gold-based electrodes (impedance ranged from 285.95 Ω to 2.913 kΩ, and phase angle ranged from -59.65° to -70.01°). Silver-based ocular electrodes have less noise (median line noise of 6.48 x 104nV2/Hz) than gold-based electrodes (median line noise of 2.26 x 105nV2/Hz). Although silver-based electrodes usually achieve a drift rate less than 5 µV/s within 15 minutes, gold-base ocular electrode cannot achieve a stable potential. The exception is the RETeval strip type of silver electrode, which had an unusual drift at 20 minutes. The noise spectral density showed no change over time indicating that noise was not dependent on the stabilization of the electrode.
Conclusions:
From the range of electrodes tested, lower impedance, lower capacitance, and lower noise was observed in silver-based electrodes. Stabilization of an electrode is effective against drift of the electrode potential difference but not the noise.
Translational Relevance:
Application of electrodes with optimized materials improve the quality of clinical electrophysiology signals and efficiency of the recording.
