Abstract
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.
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Abbreviations
- CV:
-
coefficient of variation
- L-R function:
-
luminance-response function
- ND:
-
neutral density
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Wali, N., Leguire, L.E. Dark-adapted luminance-response functions with skin and corneal electrodes. Doc Ophthalmol 76, 367–375 (1991). https://doi.org/10.1007/BF00142675
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DOI: https://doi.org/10.1007/BF00142675