Results 171 to 180 of about 16,330 (213)
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Transient sensitization by a contrast flash
Vision Research, 1980Abstract A large, annular contrast-flash that raises thresholds for a test spot under some conditions can lower theresholds under other conditions. Incremental thresholds for a 2.5° test flash were measured upon a 10° adapting field. When an annulus, 2.5–9°, was flashed shortly before or shortly after presentation of the test spot, threshold was ...
E, Pulos, J E, Raymond, W, Makous
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Contrast Sensitivity and Increment Threshold
Perception, 1972The threshold of rectangular and annular increments was established on square-wave gratings of 1 foot lambert mean luminance. In the range of 5–18 cycles/degree the threshold fell as the spatial frequency of the background increased. The threshold change was similar for rectangles and annuli, but the exponent of the curve differed according to the ...
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Spatiotemporal separability in contrast sensitivity
Vision Research, 1994Contrast sensitivity functions were measured in two ways: by counterphase modulation; and by in-phase modulation, in which the luminance of every point of a spatial grating was sinusoidally modulated in phase with one another. Contrast sensitivity functions measured by counterphase modulated gratings show spatiotemporal interactions that represent ...
J, Yang, W, Makous
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Contrast sensitivity in diabetic pregnancy
Graefe's Archive for Clinical and Experimental Ophthalmology, 1997To evaluate the correlation between the changes in contrast sensitivity and retinopathy throughout pregnancy in diabetic women with mild background diabetic retinopathy.Contrast sensitivity (Vistech 6500 Contrast Test System) was measured in 22 type I diabetic women with mild background retinopathy [0-16 microaneurysms (MAs)/eye and occasional small ...
T, Hellstedt +3 more
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Contrast Sensitivity Function for Stereopsis
Perception, 1978Contrast thresholds for stereopsis from narrow-band-filtered random-dot stereograms were compared with contrast thresholds for simple detection of similar narrow-band noise. Centre frequencies of filters were in the range 2·5–15 cycles deg−1. It was found that the contrast sensitivity function for stereopsis is similar in shape to that for detection ...
J P, Frisby, J E, Mayhew
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CONTRAST SENSITIVITY OF THE HUMAN RETINA
American journal of optometry and archives of American Academy of Optometry, 1972ABSTRACT Contrast thresholds (ΔL/L) were measured from the fovea to the far periphery at 2 degree intervals, along 12 meridians for a total of 1350 data points. The test spot, 10 minutes of are in diameter, was presented against a 0.85 m: background in the Harms perimeter.
L O, Harvey, E, Pöppel
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Effect of pterygium on contrast sensitivity
International Ophthalmology, 2013The purpose of this study is to evaluate the effect of pterygium on contrast sensitivity. Thirty-six eyes with pterygium and 18 eyes without pterygium were included in the study. The size of the pterygium was measured on the slit lamp both vertically at the limbus and categorized into three groups (≤3, 3.1 to ≤5, >5 mm), and horizontally on the cornea ...
Archana, Malik +4 more
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Contrast Sensitivity in Albinotic Patients
Optometry and Vision Science, 1983ABSTRACT Vertical and horizontal grating contrast sensitivity functions (CSF) were measured on eight albinotic patients. Several of these patients also had CSF measurements performed through their telescopic aids. For all the patients, the horizontal grating CSF was more sensitive than the vertical grating CSF. Although there are many
D S, Loshin, R A, Browning
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Contrast sensitivity in asymmetric glaucoma
International Ophthalmology, 1984We measured central contrast sensitivity in both eyes of 27 patients with asymmetric glaucomatous visual field loss or optic disc cupping. In 15 patients contrast sensitivity was less in the eye that by perimetry or ophthalmoscopy was the more severely damaged. In 10 patients contrast sensitivity was the same in the two eyes.
M A, Motolko, C D, Phelps
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Contrast Sensitivity and Functional Vision
International Ophthalmology Clinics, 2003How well does a person see faces in a crowd, read a newspaper, or drive an automobile at night? These are vital questions about a person's quality of life and safety. Obtaining answers to these questions requires tests of functional vision.
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