Dark-adapted luminance-response functions with skin and corneal electrodes
✍ Scribed by Naheed Wali; Lawrence E. Leguire
- Publisher
- Springer-Verlag
- Year
- 1991
- Tongue
- English
- Weight
- 378 KB
- Volume
- 76
- Category
- Article
- ISSN
- 0012-4486
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✦ Synopsis
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.