Results 21 to 30 of about 4,603,420 (293)
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. +4 more
core +1 more source
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 +8 more
core +1 more source
The impact of irregular corneal shape parameters on visual acuity and contrast sensitivity
BMC Ophthalmology, 2020 Background To understand which irregular corneal parameters determine the visual quality in keratoconus subjects. Methods The cross-sectional study examined the eyes of 44 subjects, graded from the first to third keratoconus stages by Amsler-Krumeich ...
Sanita Liduma +2 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 study on disability glare vision in young adult subjects
Scientific Reports, 2023 The full assessment of the visual system must include the evaluation of the optical quality of the eye and neural visual functions. The objective evaluation of the retinal image quality is often carried out by computing the point spread function (PSF) of
Pilar Casado +3 more
doaj +1 more source
Medicina, 2021 Background and Objectives: preoperative differentiation of enlarged parathyroid glands may be challenging in conventional B-mode ultrasound. The aim of our study was to analyse qualitative and quantitative characteristics of parathyroid gland lesions ...
Sergejs Pavlovics +10 more
doaj +1 more source
Functional evidence for cone-specific connectivity in the human retina [PDF]
, 2005 NoPhysiological studies of colour vision have not yet resolved the controversial issue of how chromatic opponency is constructed at a neuronal level. Two competing theories, the cone-selective hypothesis and the random-wiring hypothesis, are currently ...
McGraw, Paul V. +7 more
core +1 more source
Peripheral contrast sensitivity in glaucoma and ocular hypertension. [PDF]
British Journal of Ophthalmology, 1990 Contrast sensitivity has been measured in patients with glaucoma and ocular hypertension, the latter graded into high, medium, and low risk clinical groups. Measurements were made centrally and peripherally at 10 degrees, 15 degrees, 20 degrees, and 25 degrees off-axis at each of the four meridians 45 degrees, 135 degrees, 225 degrees, and 315 degrees.
F, Falcão-Reis +4 more
openaire +2 more sources
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 +3 more
core +1 more source
Peripheral and central colour contrast sensitivity in diabetes [PDF]
Acta Ophthalmologica Scandinavica, 1998 To study the influence of diabetes, with or without early retinopathy, on peripheral and central colour contrast sensitivity.The study included 32 patients with diabetes mellitus type II and 47 age-matched normals. The patients were divided into three sub-groups. 1. Diabetics with no retinopathy (on photographs or biomicroscopy). 2.
openaire +2 more sources