Results 281 to 290 of about 3,443,078 (337)
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Ophthalmology Clinics of North America, 2003
Spatial contrast is a physical dimension referring to the light-dark transition of a border or an edge in an image that delineates the existence of a pattern or an object. Contrast sensitivity refers to a measure of how much contrast a person requires to see a target.
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Spatial contrast is a physical dimension referring to the light-dark transition of a border or an edge in an image that delineates the existence of a pattern or an object. Contrast sensitivity refers to a measure of how much contrast a person requires to see a target.
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Contrast sensitivity in children
Vision Research, 1982We have used a spatial two-alternative, forced-choice staircase technique to measure contrast sensitivities for sinusoidally modulated gratings. Subjects, all of whom were untrained observers, consisted of children of ages 2-16 yr and adults. Our testing method was completely successful with children who were over 3.5 yr but failed with those below 2.5
A, Bradley, R D, Freeman
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Contrast sensitivity in dyslexia
Visual Neuroscience, 1995AbstractContrast sensitivity was determined for dyslexic and normal readers. When testing with temporally ramped (i.e. stimuli with gradual temporal onsets and offsets) gratings of 0.6, 4.0, and 12.0 cycles/deg, we found no difference in contrast sensitivity between dyslexic readers and controls.
Karen Gross-Glenn +11 more
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Contrast Sensitivity After Epikeratophakia
Cornea, 1988Epikeratophakia is a rapidly evolving surgical procedure for the refractive correction of aphakia. Even when Snellen acuity after epikeratophakia is normal, patients often report a subjective degradation of the visual image through the surgically corrected eye.
M J, Mannis +3 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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Contrast Sensitivity and Glaucoma
Journal of Glaucoma, 2019Spatial contrast sensitivity decline occurs in different types and stages of glaucoma. In this short review we discuss methods of assessing contrast sensitivity, the role of contrast sensitivity in the pathogenesis of glaucoma and its practical application in clinical practice.
Parul, Ichhpujani +2 more
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Contrast sensitivity throughout adulthood
Vision Research, 1983Previous studies of spatial contrast sensitivity in adulthood have produced conflicting results. To clarify the situation, we measured contrast sensitivity functions on a large sample of adults (n = 91), ranging in age from 19 to 87. All observers were free from significant ocular pathology and were individually refracted for the test distance ...
C, Owsley, R, Sekuler, D, Siemsen
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Ophthalmology, 1989
The detection of small luminance differences between objects and their backgrounds is an important tool for navigating in the visual environment. Many visual system disorders cause patients to complain that their vision is cloudy or blurred, or that the borders of objects are blurred, even though they retain 20/20 Snellen acuity.
Mark J. Kupersmith +2 more
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The detection of small luminance differences between objects and their backgrounds is an important tool for navigating in the visual environment. Many visual system disorders cause patients to complain that their vision is cloudy or blurred, or that the borders of objects are blurred, even though they retain 20/20 Snellen acuity.
Mark J. Kupersmith +2 more
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