[Electrical activity of the retina in different axial lengths of the eye in humans].
In subjects with normal vision, we studied the relationship between the axial length of the eye and the amplitude-temporal characteristics of different types of ganzfield ERG. The amplitude of the ERG had the highest variability in the middle of the range of the axial eye lengths. The variability decreased at both ends of the range. With increasing axial length, the amplitude of the b-wave of all types of ERG decreased, and the latency decreased concurrently. The b-wave reflects the activity of the retinal ON-neurones depolarizing in response to the light stimulus. We assume that the decrease in the amplitude of b-wave may be related to the decreased number of photoreceptors and of neurons in the following retinal levels and/or increased inhibition in proximal retina, as well as an increase in relative activity of retinal OFF-neurones hyperpolarizing in response to the light stimulus.
Koshelev
D I
DI
National Centre of the Eye and Plastic Surgery, 450075, 67/1 R. Zorge St., Russia, Ufa.
Iusupov
R G
RG
D000221:Adaptation, Ocular / Q000502:physiology; D000293:Adolescent; D000328:Adult; D004596:Electroretinography / Q000379:methods*; D006801:Humans; D008297:Male; D009474:Neurons / Q000166:cytology / Q000502:physiology; D010775:Photic Stimulation; D010786:Photoreceptor Cells / Q000502:physiology; D012160:Retina / Q000166:cytology / Q000502:physiology*