Man Tony T C, Yip Yolanda W Y, Cheung Frederick K F, Lee Wing Sze, Pang Chi Pui, Brelén Mårten Erik
Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Kowloon, Hong Kong.
Transl Vis Sci Technol. 2020 Jun 30;9(7):45. doi: 10.1167/tvst.9.7.45. eCollection 2020 Jun.
The aim of this study was to evaluate and compare the electrical performance and properties of commercially available electroretinography (ERG) electrodes.
A passive ionic model was used to measure impedance, noise, and potential drift in 10 types of ocular surface and skin ERG electrodes.
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 10nV/Hz) than gold-based electrodes (median line noise of 2.26 x 10nV/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.
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.
Application of electrodes with optimized materials improve the quality of clinical electrophysiology signals and efficiency of the recording.
本研究旨在评估和比较市售视网膜电图（ERG）电极的电性能和特性。
使用被动离子模型测量10种眼表和皮肤ERG电极的阻抗、噪声和电位漂移。
银基眼用电极的阻抗通常较低（范围为65.35 - 343.3Ω），相角较小（范围为 - 6.41°至 - 33.91°），而金基电极的阻抗范围为285.95Ω至2.913kΩ，相角范围为 - 59.65°至 - 70.01°。银基眼用电极的噪声（中线噪声为6.48×10nV/Hz）比金基电极（中线噪声为2.26×10nV/Hz）小。尽管银基电极通常在15分钟内实现小于5µV/s的漂移率，但金基眼用电极无法实现稳定电位。例外的是RETeval条型银电极，其在20分钟时出现异常漂移。噪声谱密度随时间无变化，表明噪声不依赖于电极的稳定。
在所测试的电极范围内，银基电极具有较低的阻抗、较低的电容和较低的噪声。电极的稳定对电极电位差的漂移有效，但对噪声无效。
应用具有优化材料的电极可提高临床电生理信号的质量和记录效率。
