Small field tritanopia in the peripheral retina
نویسندگان
چکیده
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 کاملPosition sense of the peripheral retina.
Position acuity was measured over a wide range of eccentricities, from 3 min to 10 deg in the horizontal meridian, by using both a three-dot bisection task and a three-dot vernier task. A foveal fixation dot appeared for 1 sec before an outer pair of test dots was flashed for 200 msec. Bisection and vernier tasks were used to measure position acuity in the radial and tangential directions, resp...
متن کاملDecoding natural signals from the peripheral retina.
Ganglion cells in the peripheral retina have lower density and larger receptive fields than in the fovea. Consequently, the visual signals relayed from the periphery have substantially lower resolution than those relayed by the fovea. The information contained in peripheral ganglion cell responses can be quantified by how well they predict the foveal ganglion cell responses to the same stimulus...
متن کاملContrast sensitivity of the human peripheral retina.
Threshold contrasts were measured psychophysically for a sinusoidal grating targetcentered 12’in the peripheral retina. The relationship between contrast sensitivity, the reciprocal ofthe threshold contrast, and the spatial frequency of the gratings can be adequately described by thedifference of two Gaussian functions. The parameters of the fitted Gaussians are used to describe...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of the Optical Society of America A
سال: 2016
ISSN: 1084-7529,1520-8532
DOI: 10.1364/josaa.33.001226