Dark-adapted luminance-response functions with skin and corneal electrodes.
Normative dark-adapted electroretinograms were recorded simultaneously with a skin electrode and corneal electrode for varying stimulus intensities. The electroretinogram b-wave amplitudes for each electrode were fitted by the Naka-Rushton equation, and the parameters Vmax, K and n were evaluated. A comparison of parameters between the two electrodes showed a significant difference for Vmax and K but not for n. Vmax was approximately eight times smaller and K was 0.3 log unit smaller for the skin electrode than for the corneal electrode. B-wave amplitude and implicit time were also compared between the two electrodes. The b-wave amplitude ratio of the corneal electrode to that of the skin electrode increased with luminance and ranged from 1.83 to 7.68. Overall, b-wave implicit time for the skin electrode was approximately 10 ms shorter than that of the corneal electrode.
Wali
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Department of Ophthalmology, Children's Hospital, Columbus, OH 43205.
Leguire
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D000328:Adult; D003315:Cornea / Q000502:physiology*; D003623:Dark Adaptation; D004566:Electrodes; D004596:Electroretinography; D005712:Galvanic Skin Response / Q000502:physiology*; D006801:Humans; D008027:Light; D010775:Photic Stimulation