Pigment epithelial function in canine retina.
The lateral distribution and temporal changes in the eye standing potential of 15 dogs with normal eyes (as determined by use of an ophthalmoscope and electroretinography) were measured by use of noninvasive methods. The standing potential was converted to an alternating potential by controlled eye movement. The light peak occurred 6 minutes after a stimulus intensity increase of 4 log units. The ratios of the highest measured voltage after the light step divided by the voltage measured immediately before the light step ranged from 1.27 to 2.07 (mean 1.74 +/- SEM, 0.064). The responses typically decayed slowly after the light peak. The potential after the light peak did not return to prelight step values during the observation period. The field potential of the standing potential decreased nonlinearly in temporal direction from the outer canthus.
Kommonen
B
B
Department of Ophthalmology, College of Medicine, University of Florida, Gainesville 32610.
Dawson
W W
WW
Parmer
R
R
D000818:Animals; D004285:Dogs / Q000502:physiology*; D004596:Electroretinography / Q000662:veterinary; D005074:Evoked Potentials, Visual; D005133:Eye Movements; D009887:Ophthalmoscopy / Q000662:veterinary; D010857:Pigment Epithelium of Eye / Q000502:physiology*