The development of scotopic sensitivity.

摘要: UNLABELLED PURPOSE. Test the hypothesis that developmental increases in rod photoreceptor sensitivity and rod-mediated visual at 10 degrees, 20 degrees , 30 eccentric are concurrent. It is known maturation of parafoveal (10 eccentric) outer segments delayed compared to eccentric. METHODS Rod isolated electroretinographic (ERG) responses full-field stimuli were obtained from dark-adapted subjects (n = 71), ranging age early infancy through middle age. was calculated by fitting a model activation phototransduction a-wave response. driven b-wave stimulus-response functions. A logistic growth used summarize photoreceptors b-wave. Previously reported dark-adapted, sensitivities eccentric, using preferential looking procedures, reanalyzed model. RESULTS The accounted for 57% 85% variance each parameter with normal subjects. shape curve which reaches 50% adult value similar (10.0-13.5 weeks) rods, b-wave, peripheral sensitivity, but significantly older, 19.5 weeks, sensitivity. CONCLUSIONS peripheral, develop concurrently. parsimonious explanation determines during development.