منابع مشابه
Foveal tritanopia.
Measurements of sensitivity and color discrimination suggest that an area roughly 25’ in diameter in the central fovea lacks functioning blue-sensitive cones. Alternative explanations such as screening by macular pigment or Troxler fading are shown to be unable to account for the results. Evidence is presented that residual B cone-mediated color discrimination found in this and previous studies...
متن کاملExtent of foveal tritanopia in diabetes mellitus.
AIM To use a colour matching technique to test the hypothesis that the foveal tritanopic zone is increased in size in diabetes mellitus. METHOD A Wright tristimulus colorimeter was adapted for small field colour matching and colour matches were performed on bipartite fields in the range 12' to 60' of arc. The reference stimulus was 490 nm desaturated with 650 nm and the matching stimulus cons...
متن کاملTransient tritanopia of a second kind.
Using a psychophysical method that allows the tracking of very rapid changes in sensitivity, we demonstrate an anomaly in the time-course of light adaptation for the short-wave mechanism: after the onset of a yellow (581 nm) field of approximately 10(5.3) td the threshold for short-wave targets does not recover monotonically but continues to rise for several seconds before falling to its equili...
متن کاملTheory of wavelength discrimination in tritanopia.
Many theories of color discrimination predict a discontinuity in the wavelength-discrimination function of a tritanope at the point in the spectrum at which the rate of change of the visual signal constrained to an equiluminant plane passes through zero (near 460 nm). The predicted discontinuity follows from the use of a first-order approximation for which the reciprocal of the slope of the res...
متن کاملEffect of foveal tritanopia on reaction times to chromatic stimuli.
To investigate the effect of foveal inhomogeneities on sensitivity to chromatic stimuli, we measured simple reaction times (RTs) and detection thresholds to temporally and spatially blurred isoluminant stimuli at retinal eccentricities from 0 deg to 8 deg. Three color-normal subjects participated. Contrast gain was derived from the slope of the RT versus contrast function. With a Gaussian spati...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1983
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1983.sp014557