Results 161 to 170 of about 16,330 (213)
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Evaluating contrast sensitivity
SPIE Proceedings, 2006The problem for proper rendering of spatial frequencies in digital imaging applications is to establish the relative contrast sensitivity of observers at suprathreshold contrast levels in typical viewing environments. In an experimental study two methods of evaluating spatial contrast sensitivity were investigated, using targets of graded tonal ...
Saori Kitaguchi +2 more
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Jogging and contrast sensitivity
Acta Ophthalmologica, 1988Abstract. Threshold contrast sensitivity was measured using sinusoidal gratings with the method of increasing contrast both before and after jogging in fresh air. The mean contrast sensitivity of 11 subjects was higher after jogging at all three spatial frequencies studied (1, 6 and 19 c/deg). The differences were statistically significant. The effect
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Contrast sensitivity of optokinetic nystagmus
Vision Research, 1991To determine the threshold characteristics of optokinetic nystagmus (OKN), contrast thresholds for involuntary OKN were measured for gratings of different spatial frequency to yield an OKN-contrast sensitivity function (OKN-CSF). The OKN-CSF resembled an inverted U-shaped function with temporal-to-nasal and nasal-to-temporal movement yielding similar ...
L E, Leguire +5 more
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Journal francais d'ophtalmologie, 1987
In some patients with neural or ophthalmological lesions, normal visual acuity co-exists with a significantly diminished ability to see larger objects. The converse may also occur. Based upon many years of academic research and some years of clinical application, spatial contrast sensitivity function appears to give the most general description ...
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In some patients with neural or ophthalmological lesions, normal visual acuity co-exists with a significantly diminished ability to see larger objects. The converse may also occur. Based upon many years of academic research and some years of clinical application, spatial contrast sensitivity function appears to give the most general description ...
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Effect of Ibuprofen on Contrast Sensitivity
Optometry and Vision Science, 1992ABSTRACT Therapeutic doses of ibuprofen (2‐4'‐isobutylphenylpropionic acid) have been shown to have many deleterious effects on the nervous system. However, visual disturbances have been reported in fewer than 1% of the patients taking recommended doses of ibuprofen.
W H, Ridder, A, Tomlinson
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Contrast sensitivity in radial keratotomy
Acta Ophthalmologica, 1991Abstract In a prospective study, contrast sensitivity function was determined before and one month post‐surgery in 15 consecutive cases of radial keratotomy. The results obtained pre‐operatively were compared to those of an age‐matched, emmetropic reference group also comprising 15 persons. Three different test conditions were employed.
H, Olsen, J, Andersen
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Iodinated contrast sensitivity in ERCP
The American Journal of Gastroenterology, 2000Iodine contrast media are detectable in the bloodstream after ERCP, and sensitivity reactions have been described. The risk is very small, and the phenomenon is therefore difficult to study. This review discusses the possible need for preventative strategies, and recommends that endoscopists consider the issue and define their own policies.
P, Draganov, P B, Cotton
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Myopia and contrast sensitivity function
Current Eye Research, 2001to measure the contrast sensitivity function of varying degrees of myopia with two types of optical correction (spectacle lens and contact lens).One hundred and five myopic eyes and twenty-eight emmetropic eyes were collected. The myopic group included 105 eyes corrected with spectacle lenses and 71 eyes of them corrected with contact lenses, too; all ...
S W, Liou, C J, Chiu
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Contrast sensitivity in Parkinson's disease
Neurology, 1986We studied contrast-sensitivity function in 39 patients with Parkinson's disease. Sixty-four percent of the patients showed contrast-sensitivity loss in one or both eyes. The abnormality was not related to the first symptom or the severity of disease.
C, Bulens +3 more
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CONTRAST SENSITIVITY IN MONOCULAR GLAUCOMA
Acta Ophthalmologica, 1983The results of this selected group of glaucoma patients demonstrate that the effect of glaucoma on the contrast sensitivity can be assessed only after careful exclusion of all other causes for decrease in contrast sensitivity. Further development of methods is necessary.
L, Hyvärinen +4 more
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