The rod increment threshold during dark adaptation in normal and rod monochromat.
نویسندگان
چکیده
منابع مشابه
Rod-mediated increment threshold functions in infants.
PURPOSE To obtain and analyze scotopic increment threshold functions to test the hypothesis that rod photoreceptor immaturity accounts for the elevation of infants' over controls' dark-adapted thresholds and elevation of parafoveal over peripheral thresholds in infants. METHODS Using a preferential looking method, thresholds for detection of 2(o), 50 msec, blue stimuli presented 10(o) (parafo...
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The afterimages visible after cones have recovered in dark adaptation fade against any steady background, but may be revived by a sudden change in the intensity or wavelength of the background. However, when a change of background wavelength is not detectable by rods, it does not revive such an afterimage. showing that sensitivity to cone stimuli has not been affected by bleaching the rods. To ...
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The time course of rod dark adaptation was measured in 12 patients and carriers of retinitis pigmentosa (RP). In contrast to previous studies the rod absolute threshold was determined prior to any exposure to the bleaching light. For seven of the patients and carriers the recovery of rod sensitivity to the prebleach level was prolonged, with the delay ranging from mild to severe. The prolongati...
متن کاملRod photoreceptor dysfunction in diabetes: activation, deactivation, and dark adaptation.
PURPOSE To examine photoreceptor function in diabetes in detail by evaluating photoreceptor light activation, deactivation of the photoresponse, and recovery of the photoreceptor after bleaching (dark adaptation) in rats made diabetic with streptozotocin (STZ). METHODS Animals were assigned to treated and control groups. Light activation in rod photoreceptors was established using a paired-fl...
متن کاملIncrement threshold and detection latency in the rod and cone systems.
It was reported previously that increment-threshold functions obtained in the dark-adapted rod and cone systems have two distinct branches, and that these functions are predicted by a simple model similar to those developed to describe vertebrate reaptor responses. The model also makes several unusual predictions concerning the latency for detection of the increment field at threshold. These pr...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1965
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1965.sp007787