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An electrical artifact associated with the ERG-jet gold foil electrode
1Department of Physiology, University of Minnesota Medical School, Minneapolis 55455.
Investigative Ophthalmology & Visual Science
|July 1, 1993
Summary
A photoelectric artifact from ERG-jet electrodes can mimic electroretinogram (ERG) signals. This artifact, caused by electrode polarization, appears with longer light flashes and varies with stimulus properties and electrode characteristics.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Electrophysiology
Background:
- The ERG-jet corneal contact lens electrode is used for electroretinography.
- Understanding potential artifacts is crucial for accurate electrophysiological recordings.
Purpose of the Study:
- To investigate a specific photoelectric artifact associated with the ERG-jet corneal contact lens electrode.
- To characterize the conditions under which this artifact occurs and its properties.
Main Methods:
- Reproduced the artifact in vitro and in vivo using varying light flash durations (50 msec), intensities, and wavelengths.
- Examined the influence of ionic strength and temperature on the artifact.
- Compared in vivo ERG-jet recordings with those from a Burian-Allen bipolar electrode.
Main Results:
- The artifact was observed with longer light flashes (≥ 50 msec) and higher intensities, resembling the late PIII component of the ERG.
- Artifact magnitude and polarity varied between electrodes.
- Stimulus wavelength, ionic concentration, and temperature significantly affected the artifact.
- Shorter wavelengths elicited greater artifact responses.
Conclusions:
- The artifact originates from electrode polarization at the gold foil-ionic medium interface.
- Caution is advised when using light stimuli longer than 2-3 msec with ERG-jet or similar electrodes.
- This finding impacts the interpretation of electroretinogram data obtained with this electrode type.