Results 21 to 30 of about 9,643,688 (148)

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

, 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 ...
Hine, Trevor, Shepherd, Alex J., Hine, T.J., Shepherd, Alex J, Beaumont, Heidi M, Shepherd, Alex, Hine, Trevor J, Beaumont, H.M., Beaumont, Heidi   +8 more
core   +1 more source

Binocular summation of contrast remains intact in strabismic amblyopia [PDF]

, 2007
PURPOSE. Strabismic amblyopia is typically associated with several visual deficits, including loss of contrast sensitivity in the amblyopic eye and abnormal binocular vision.
Meese, Tim S., Hess, Robert F., Meese, Timothy S., Mansouri, Behzad, Baker, Daniel H.   +4 more
core   +1 more source

Contrast Enhancement Using Sensitivity Model-Based Sigmoid Function

IEEE Access, 2019
For indirect contrast enhancement, researchers have proposed various transformation functions based on histogram equalization and gamma correction.
Seung Park, Yong-Goo Shin, Sung-Jea Ko
doaj   +1 more source

Contrast sensitivity and discrimination in pictorial images [PDF]

, 2014
This paper describes continuing research concerned with the measurement and modeling of human spatial contrast sensitivity and discrimination functions, using complex pictorial stimuli.
Gupta, G., Triantaphillidou, S., Jarvis, J.   +2 more
core   +1 more source

Next-generation vision testing: the quick CSF

Current Directions in Biomedical Engineering, 2015
The Contrast Sensitivity Function relates the spatial frequency and contrast of a spatial pattern to its visibility and thus provides a fundamental description of visual function.
Dorr Michael, Wille Manuel, Viulet Tiberiu, Sanchez Edward, Bex Peter J, Lu Zhong-Lin, Lesmes Luis   +6 more
doaj   +1 more source

On the decline of 1st and 2nd order sensitivity with eccentricity [PDF]

, 2008
We studied the relationship between the decline in sensitivity that occurs with eccentricity for stimuli of different spatial scale defined by either luminance (LM) or contrast (CM) modulation.
Wang, Jian, Hess, Robert F., May, Keith A., Baker, Daniel H.   +3 more
core   +1 more source

Contrast sensitivity in images of natural scenes [PDF]

, 2019
The contrast sensitivity function (CSF) characterizes spatial detection in the human visual system and is typically measured from simple, synthetic stimuli.
Gupta, G., Triantaphillidou, S., Psarrou, A., Jarvis, J.   +3 more
core   +1 more source

Effect of red ginseng on visual function and vision-related quality of life in patients with glaucoma

Journal of Ginseng Research, 2021
Background: Red ginseng has been found to improve ocular perfusion and dry eye syndrome in glaucomatous eyes; however, its effects on visual function and vision-related quality of life have not been investigated. This study sought to evaluate the effects
Kwanghyun Lee, Heon Yang, Joo Yeon Kim, Wungrak Choi, Gong Je Seong, Chan Yun Kim, Jun Mo Lee, Hyoung Won Bae   +7 more
doaj   +1 more source

Spatial Frequency Discrimination of Band-limited Periodic Targets: Effects of Stimulus Contrast, Bandwidth and Retinal Eccentricity [PDF]

, 1992
Two experiments were conducted to explore the ability of human observers to discriminate the spatial frequency of briefly-presented, Gaussian-truncated sinewave gratings.
Greenlee, Mark W.
core   +1 more source

A mechanistic inter-species comparison of spatial contrast sensitivity [PDF]

, 2008
The validity of the Rovamo-Barten modulation transfer function model for describing spatial contrast sensitivity in vertebrates was examined using published data for the human, macaque, cat, goldfish, pigeon and rat.
Jarvis, John R., Wathes, Christopher M., Wathes, C M, Jarvis, J R, Wathes, C.M., Jarvis, J.   +5 more
core   +1 more source