منابع مشابه
Dark Adaptation and Visual Pigment Regeneration in Human Cones
Foveal threshold elevation and red-green cone pigment regeneration have been studied in the dark after a wide range of bleaches in normal man with a view to probing the limits of the application of the Dowling-Rushton relation: i.e., the direct proportionality between log threshold elevation and fraction of unregenerated pigment. Cone pigment regeneration (and threshold recovery) is much faster...
متن کاملDark adaptation of the long-wavelength sensitive cones.
Long-wavelength sensitive (L) cone dark adaptation curves were measured with a 10-msec, 20' v.a., 650 nm test flash and a moderate intensity adapting field. When the 650 nm and 500 nm fields were equated for the L cones, the dark adaptation curve fell faster for the 500 nm field than for the 650 nm field. Over the range of adapting lights used, no adjustment of the intensities of the two fields...
متن کاملEndogenous nitric oxide enhances the light-response of cones during light-adaptation in the rat retina
The electroretinogram (ERG) is a non-invasive indicator of retinal function. Light flashes evoke a cornea-negative a-wave followed by a cornea-positive b-wave. Light-adaptation is known to increase the amplitude of cone-dependent b-waves. To identify the underlying mechanism, we recorded rat cone photoresponses in situ, using intravitreally-injected glutamate to block synaptic transmission and ...
متن کاملThe participation of different types of cones in human light and dark adaptation.
Though it is generally conceded that nor mal human color vision requires the presence in the retina of at least three different types of cone, it has proved very difficult to dem onstrate this directly. Many visual variables show clearly by an inflection or a change in hue the transition from cone to rod function ; but the cones, though a highly mixed popu lation, ordinarily display no such ...
متن کاملVisual pigment bleaching in isolated salamander retinal cones. Microspectrophotometry and light adaptation
Visual pigment bleaching desensitizes rod photoreceptors greatly in excess of that due to loss of quantum catch. Whether this phenomenon also occurs in cone photoreceptors was investigated for isolated salamander red-sensitive cones. In parallel experiments, (a) visual pigment depletion by steps of bleaching light was measured by microspectrophotometry, and (b) flash sensitivity was measured by...
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ژورنال
عنوان ژورنال: Biophysical Journal
سال: 1982
ISSN: 0006-3495
DOI: 10.1016/s0006-3495(82)84502-5