Results 51 to 60 of about 8,469,152 (382)

Reliability in perimetric multichannel contrast sensitivity measurements [PDF]

open access: yes, 2014
Background: In this study, the reliability of perimetric contrast sensitivity measurements favouring the achromatic, the red-green and the blue-yellow post-receptorial mechanisms was analysed.
Camps, Vicente J.   +4 more
core   +2 more sources

Motion processing deficits in migraine are related to contrast sensitivity [PDF]

open access: yes, 2012
Background: There are conflicting reports concerning the ability of people with migraine to detect and discriminate visual motion. Previous studies used different displays and none adequately assessed other parameters that could affect performance, such ...
Beaumont, H.M.   +2 more
core   +1 more source

Comparing the Shape of Contrast Sensitivity Functions for Normal and Low Vision

open access: yesInvestigative Ophthalmology and Visual Science, 2015
Purpose The contrast sensitivity function (CSF) provides a detailed description of an individual's spatial-pattern detection capability. We tested the hypothesis that the CSFs of people with low vision differ from a “normal” CSF only in their horizontal ...
Susana T. L. Chung, G. Legge
semanticscholar   +1 more source

Dyschromatopsia and contrast sensitivity changes in COVID-19 patients

open access: yesIndian Journal of Ophthalmology, 2023
Purpose: To evaluate the alterations in the psycho-physical tests, contrast sensitivity (CS) and hue discrimination (total estimation score, TES) in COVID-19 patients.
Aditi Sharma   +10 more
doaj   +1 more source

Contrast sensitivities in the Gaia Data Release 2

open access: yes, 2018
The source detection sensitivity of Gaia is reduced near sources. To characterise this contrast sensitivity is important for understanding the completeness of the Gaia data products, in particular when evaluating source confusion in less well resolved ...
Brandeker, Alexis, Cataldi, Gianni
core   +1 more source

Comparison between gadolinium-enhanced 2D T1-weighted gradient-echo and spin-echo sequences in the detection of active multiple sclerosis lesions on 3.0T MRI [PDF]

open access: yes, 2017
Objectives To compare the sensitivity of enhancing multiple sclerosis (MS) lesions in gadolinium-enhanced 2D T1-weighted gradient-echo (GRE) and spin-echo (SE) sequences, and to assess the influence of visual conspicuity and laterality on detection of
Alcaide, Paula   +9 more
core   +2 more sources

Factors influencing contrast sensitivity function in myopic eyes. [PDF]

open access: yesPLoS ONE, 2014
To evaluate the factors affecting the area under the log contrast sensitivity function (AULCSF) in healthy myopic eyes.We retrospectively examined 201 eyes of 201 consecutive subjects (age, 31.8 ± 7.4 years (mean ± standard deviation)) with myopic ...
Kazutaka Kamiya   +3 more
doaj   +1 more source

Rhythmic Oscillations of Visual Contrast Sensitivity Synchronized with Action

open access: yesJournal of Neuroscience, 2015
It is well known that the motor and the sensory systems structure sensory data collection and cooperate to achieve an efficient integration and exchange of information.
A. Tomassini   +4 more
semanticscholar   +1 more source

Effects of astigmatic defocus on binocular contrast sensitivity. [PDF]

open access: yesPLoS ONE, 2018
PURPOSE:To determine the effects of astigmatism on contrast sensitivity (CS). METHODS:Eighteen normal volunteers (30.5 ± 6.0 [mean ± SD] years) were recruited. After correcting each refractive error by spectacles, against-the-rule (ATR) or with-the-rule (
Yumi Hasegawa   +4 more
doaj   +1 more source

Quantum limit of optical magnetometry in the presence of ac-Stark shifts [PDF]

open access: yes, 2000
We analyze systematic (classical) and fundamental (quantum) limitations of the sensitivity of optical magnetometers resulting from ac-Stark shifts. We show that in contrast to absorption-based techniques, the signal reduction associated with classical ...
Fleischhauer, M.   +2 more
core   +3 more sources

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