Contrast sensitivity and visual acuity. Medical search. Frequent questions

Like a standard Snellen visual acuity chart, the Pelli Robson chart consists of horizontal lines of capital letters but instead of the letters getting smaller on each successive line, it is the contrast of the letters (relative to the chart background) that decreases with each line. (allaboutvision.com)
Since a standard Snellen visual acuity chart is viewed at 20 feet, this type of chart is difficult to fit into a typical exam room. (visioncenter.org)

ISRCTN13894787 ) were assessed using a range of psychophysical measures of visual function, including best corrected visual acuity (BCVA), letter contrast sensitivity (CS), mesopic and photopic CS, mesopic and photopic glare disability (GD), photostress recovery time (PRT), reading performance and subjective visual function, using the National Eye Institute Visual Function Questionnaire-25 (NEI VFQ-25). (bmj.com)
All subjects underwent full ophthalmological examination including best-corrected visual acuity (BCVA), relative afferent pupillary defect, slit lamp, and fundus examination. (hindawi.com)

High contrast (HC) and low contrast (LC) best-corrected visual acuity (BCVA) and contrast sensitivity were assessed using ETDRS charts and vertical sinusoidal gratings, respectively. (uwaterloo.ca)
Despite these results, there were no associations between subjective ratings and higher order aberrations, LC BCVA or contrast sensitivity for both groups and a clear understanding of the relationship between these outcome measures was not apparent. (uwaterloo.ca)

Unsure about which lens material would best suit her needs, she wonders how these different materials differ in terms of visual acuity, impact resistance, and overall quality. (manpradasunglasses.com)
In conclusion, WFG LASIK had excellent outcomes in terms of visual acuity, contrast sensitivity, and subjective ratings, despite an increase in higher order aberrations compared with those found prior to surgery. (uwaterloo.ca)

The visual acuity test is used to determine the smallest letters you can read on a standardized chart (Snellen chart) or a card held 20 feet (6 meters) away. (medlineplus.gov)
Prior to assessing contrast sensitivity (CS) determine distance vision/visual acuity using the Snellen chart. (academy.org.uk)
Most ophthalmologists use the Snellen eye chart to measure visual acuity. (visioncenter.org)

Supported in part by a grant from the Spanish Ministry of Health, Instituto Carlos III, Red Temática de Investigación Cooperativa en Salud Patología Ocular del Envejecimiento, Calidad Visual y Calidad de Vida, Subproyecto de Calidad Visual (RD07/0062). (lww.com)
Visual and ocular changes associated with exposure to two tertiary amines. (cdc.gov)
To determine if exposure to dimethylisopropanolamine (DMIPA) and dimethylaminoethanol (DMAE) in a label printing plant was associated with visual disturbances and/or ocular changes. (cdc.gov)
A meta-analysis of spherical versus aspheric IOLs showed better contrast sensitivity with the latter at all spatial frequencies, most conspicuously under mesopic conditions and with pupillary sizes of 4 mm or greater, as well as reduced overall ocular SA. (crstoday.com)
15 Studies using other aspheric IOLs extended these findings to include better mesopic contrast sensitivity, a higher modulation transfer function cutoff, and lower ocular SA with customization. (crstoday.com)
Visual acuity charts only measure the eases, history of previous ocular surgery high frequency component of the contrast or photocoagulation and systemic diseases sensitivity function and are markedly af- other than diabetes. (who.int)
Afterwards, the best corrected ocular diseases, including optic neuritis and visual acuity was determined on a subjec- glaucoma, where contrast sensitivity can be tive basis. (who.int)
Ocular examination involves assessment of visual acuity and pupillary reaction, as well as anterior segment, retinal, and funduscopic evaluation. (medscape.com)
We describe the frequency, demographic and clinical features, and visual outcomes of ocular syphilis infections observed during 2012-2015 at a tertiary reference center in Paris, France. (cdc.gov)
At follow-up, the best visual outcomes were observed in patients whose mean time from first ocular symptom to consultation was 15 days (SD + 19 days). (cdc.gov)
Failure to recognize the ocular manifestations of syphilis or delayed treatment can lead to irreversible visual loss ( 14 , 15 ). (cdc.gov)

01). Distance-corrected near visual acuity was significantly better in the multifocal group postoperatively ( P ≤.04). (lww.com)
Earlier MIOL designs were bifocal, allowing the patient to obtain a postoperative functional distance and near visual acuity. (scirp.org)

Visual acuity, contrast sensitivity, glare sensitivity and kinetic visual fields were measured at each test session. (bmj.com)
Assists visual performance and acuity by targeting glare sensitivity, contrast sensitivity, and vision in dim light. (giftespot.com)
The study revealed that some of the key visual functions that are altered by cannabis are visual acuity, contrast sensitivity, the ability to focus, and glare sensitivity. (earth.com)

All patients were able to perform both tests, and almost all patients showed moderate or profound deficits in contrast sensitivity (normal value, ~1.70 log units) despite near-normal visual acuity. (arvojournals.org)
A person with normal visual acuity but poor contrast sensitivity might see the trees in the foreground clearly (high contrast), but have trouble seeing the contours of the mountains against the sky in the background (low contrast). (allaboutvision.com)
20/20 is a term to describe normal visual acuity. (visioncenter.org)

Visual outcomes with a single-optic accommodating intraocula. (lww.com)
To compare the visual outcomes and intraocular optical quality in patients with a low-addition (add) power multifocal refractive intraocular lens (IOL) with rotational asymmetry and a single-optic accommodating IOL. (lww.com)
You should encourage patients to access low vision services as soon as they feel they need them, rather than waiting for significant visual loss, as this can lead to better outcomes. (college-optometrists.org)
How can we take advantage of aspheric monofocal IOLs as we seek to customize visual performance and outcomes to meet the needs of each patient? (crstoday.com)
Standard visual outcomes assessed in usual care in visual rehabilitation were measured at the clinic. (frontiersin.org)
Purpose: To compare the visual and refractive outcomes, patient satisfaction and spectacle independence between three novel designs of diffractive IOLs. (scirp.org)
There was a greater increase in higher order aberrations for the hyperopic group, who also had a tendency to have lower visual outcomes and worse subjective ratings. (uwaterloo.ca)
The increasing prevalence of cataract, its potential to cause severe visual disability and its impact on quality of life [ 3 ] means that a firm understanding of the impact of cataract surgery on visual and other outcomes is important for policy development. (biomedcentral.com)
The National Eye Institute Visual Function Questionnaire (NEI VFQ-25) addresses a wider range of visual concerns, including social and mental outcomes of visual impairment [ 14 ] and allows investigation into which specific aspects of VRQOL improve after cataract surgery. (biomedcentral.com)

Aims/Objectives/Purpose To determine visual and other risk factors for falls among bilateral cataract patients awaiting first eye surgery in WA. (bmj.com)
Significance/Contribution to the field The better eye visual acuity measure could be used by clinicians to identify and possibly prioritise patients at risk of falls while waiting for cataract surgery. (bmj.com)
To investigate whether cataract surgery can improve driving performance and whether this can be predicted by changes in visual function. (bmj.com)
The change in contrast sensitivity after surgery was the best predictor of the improvements in driving performance in patients with cataract. (bmj.com)
Cataract surgery results in marked improvements in driving performance, which are related to concurrent improvements in contrast sensitivity. (bmj.com)
This study investigated the effect cataract surgery on real-world measures of driving performance for patients undergoing bilateral cataract surgery within a 3-month period, and determined how well these measures related to changes in visual performance. (bmj.com)
In most cases, people with cataracts notice a significant improvement in both visual acuity and contrast sensitivity after cataract surgery. (allaboutvision.com)
Visual acuity versus letter contrast sensitivity in early cataract. (bvsalud.org)
This algorithm has been demonstrated to provide an accurate, precise, and efficient mapping of the visual field in patients with various eye conditions, including glaucoma, diabetic retinopathy, early cataract, and age-related macular degeneration. (xjtlu.edu.cn)
To determine the impact of cataract surgery on vision-related quality of life (VRQOL) and examine the association between objective visual measures and change in VRQOL after surgery among bilateral cataract patients in Ho Chi Minh City, Vietnam. (biomedcentral.com)
Contrast sensitivity as well as stereopsis, rather than visual acuity significantly affected VRQOL after cataract surgery. (biomedcentral.com)
Cataract can affect several different aspects of vision with visual acuity being the traditional measure used to assess impairment. (biomedcentral.com)
However, a prospective study from Spain found that the influence of visual measures on VRQOL changed throughout the different stages of cataract surgery [ 8 ]. (biomedcentral.com)
Another leading cause of visual impairment, cataract, is caused by clouding of the lens in the eye. (nutritionaloutlook.com)

Visual measures including visual acuity, contrast sensitivity and stereopsis were assessed and cognitive tests administered. (bmj.com)
The headsets can also be equipped with additional screenings and testing modules like stereopsis, visual acuity, contrast sensitivity, color testing, and more, all in a portable, user-friendly headset that does not require dedicated office space or an internet connection. (globenewswire.com)

and crash involvement is predicted by deficits in contrast sensitivity. (bmj.com)

Some of the ways in which binocular summation improves binocular visual performance are Brightness perception. (wikipedia.org)
In addition, the Physio lens improves contrast sensitivity by helping people in day to day situations, such as driving at night, reading the newspaper and experiencing the vivid colors in a bouquet of flowers. (eyeglasses.com)
Given this range, several researchers have examined whether individualizing the specific aspheric monofocal IOL with respect to the eye's inherent corneal SA improves visual performance. (crstoday.com)
ˆ ` ´ ´ Jerome De Seze Gilles Defer Frederic Sedel Carl Arndt Published online: 28 May 2018 The Author(s) 2018 Abstract Objective The aim of this study was to evaluate whether Background Chronic visual loss is a disabling feature in MD1003 improves vision compared with placebo in MS patients with multiple sclerosis (MS). It was recently patients with chronic visual loss. (deepdyve.com)

Specifically, 96% had visual acuity levels less than age-expected values, 37% had poor contrast sensitivity and 31% failed the depth perception test. (medscape.com)
Poor contrast sensitivity also can increase your risk of a fall if you fail to see that you need to step down from a curb onto similarly coloured pavement. (allaboutvision.com)

To investigate contrast sensitivity (CS) in glaucoma patients with advanced visual field damage from glaucoma, and to evaluate the precision of two clinical CS tests. (arvojournals.org)
Contrast sensitivity should be routinely evaluated alongside visual acuity to monitor foveal visual function in patients with advanced glaucoma. (arvojournals.org)
Low contrast sensitivity can be a symptom of certain eye conditions or diseases such as cataracts , glaucoma or diabetic retinopathy . (allaboutvision.com)
A study evaluating bilberry in open-angle glaucoma found improvements in contrast sensitivity and visual function. (blufftonicon.com)
FDT perimetry tools enable doctors to assess visual field loss due to glaucoma earlier and with superior accuracy compared to other testing protocols. (micromedinc.com)

When a patient's visual acuity is 20/20-or close-it's tempting to assume that his or her vision is satisfactory, said Mahmood El-Gasim, MD. After finding that many patients had excellent visual acuity in the clinic but still complained of poor vision, he and colleagues at Johns Hopkins University decided to study whether other variables might affect a patient's self-rated vision status. (aao.org)
The G2 and NEO can be equipped with an automated assessment of a patient's visual sensitivity to contrast. (micromedinc.com)

visual acuity, including use of distance and near logMAR charts. (college-optometrists.org)
The primary endpoint was the mean Key Points change from baseline to month 6 in VA measured in log- arithm of the minimum angle of resolution (logMAR) at Assessment of optic nerve function is a readily 100% contrast of the selected eye. (deepdyve.com)
MD1003-treated patients also had nonsigni﫿cant These results are consistent with recent data that improvement in logMAR at 5% contrast and in RNFL showed that MD1003 can decrease progression and thickness and health outcome scores when compared with improving walking disability in patients with placebo-treated patients. (deepdyve.com)

The Pelli Robson contrast sensitivity chart tests your ability to detect letters that are gradually less contrasted with the white background as your eyes move down the chart. (allaboutvision.com)
Probably the most widely used device to test contrast sensitivity is the Pelli Robson contrast sensitivity chart. (allaboutvision.com)

In the defocus curve, the multifocal group had significantly better visual acuities at several defocus levels. (lww.com)
Major parameters were monocular and binocular uncorrected (UDVA) and corrected (CDVA) distance, uncorrected (UIVA) and distance corrected (DCIVA) intermediate (80 cm), and uncorrected (UNVA) and distance corrected (DCNVA) near (40 cm) visual acuities (UNVA), contrast sensitivity (CS), defocus curve as well as patient satisfaction and spectacle use. (scirp.org)

One of these is contrast sensitivity, and our results have shown that this parameter is significantly worse after smoking cannabis,' wrote the study authors. (earth.com)
The results of the tests confirmed that visual functions like focus and contrast sensitivity were significantly worsened following consumption. (earth.com)
The visual acuity was checked significantly decreased [10,11]. (who.int)
The ROC analyses demonstrated that a number of tests and tasks had predictive sensitivity and specificity significantly greater than chance, to measure a wide spectrum of subtle effects across the several neurodevelopment domains studied. (cdc.gov)

The accommodating group had better contrast sensitivity under photopic conditions at all spatial frequencies ( P ≤.04). (lww.com)
Conversely, some people achieve better contrast sensitivity and night vision after LASIK, compared with their vision with glasses or contact lenses before the procedure. (allaboutvision.com)

In addition, good contrast sensitivity was critical to patients' visual satisfaction, said Dr. El-Gasim, now a resident at the New York Eye and Ear Infirmary in New York City. (aao.org)

There was a statistically significant relation between total amine concentration and increased risk of reduced bilateral visual acuity and 2.5% contrast sensitivity. (cdc.gov)

The visual acuity test is a routine part of an eye examination or general physical examination, particularly if there is a change in vision or a problem with vision. (medlineplus.gov)
Binocular summation refers to the improved visual performance of binocular vision compared to that of monocular vision. (wikipedia.org)
Interestingly, the pigment is captured and normally (typically) distributed at the macula in such a way that it peaks centrally at the foveola (the part of the retina responsible for high acuity and colour vision) and declines with increasing retinal eccentricity. (bmj.com)
The patients were asked to participate in a series of tests to assess their vision, including a visual acuity test, a contrast sensitivity test and a depth perception test. (medscape.com)
The visual acuity test measured the patients' overall vision functioning, while the contrast sensitivity and depth perception tests focused on the patients' ability to distinguish between objects of different shades of color and the ability to determine relative distances between and within objects. (medscape.com)
The size of the sine-wave gratings, the contrast levels, and their tilt are all based on current vision science and empirical data. (academy.org.uk)
The vision was blurred in all subjects and visual acuity and contrast sensitivity had decreased in three of the four subjects. (bmj.com)
Four hour exposure to a TEA concentration of 3.0 mg/m3 seemed to cause no effects, whereas exposure to 6.5 mg/m3 for the same period caused blurred vision and a decrease in contrast sensitivity. (bmj.com)
[ 1 ] although permanent residual deficits in color vision and contrast and brightness sensitivity are common. (medscape.com)
Abnormal contrast sensitivity and color vision are present in almost all adults with ON even in the absence of a measurable decrease in visual acuity. (medscape.com)
Sharp vision has two key components: Visual acuity and contrast sensitivity. (eyeglasses.com)
Some examples of these tests are contrast sensitivity tests, visual acuity tests, HRR color vision tests, and Amsler grids. (payscale.com)
Exposure to tertiary amines was associated with blurry, halo, and blue-grey vision , corneal opacity, and decrements in visual acuity and contrast sensitivity at 2.5% contrast. (cdc.gov)
1 Rating their vision status from 0 to 10 (with 0 being blindness and 10 being excellent vision), the patients also completed the Activities of Daily Vision Scale (ADVS) questionnaire-including night driving, near vision, and distance vision subscales-and underwent testing of visual acuity, contrast sensitivity, stereoacuity, and visual fields. (aao.org)
In the study, better visual acuity was most likely to elicit better self-reported vision status. (aao.org)
But we also found that other variables, such as stereoacuity and visual fields, were important determinants of self-rated vision status, which no one had thoroughly studied before. (aao.org)
In addition, visual function-as represented by ADVS-was an important factor when patients rated the quality of their vision. (aao.org)
More than 20/20 visual acuity is necessary to have 'good vision,'" Dr. Citek adds. (aoa.org)
Eye preference-in sports that require monocular fixation, such as certain shooting sports, or binocularity, in most other sports-as well as accommodation, convergence, contrast sensitivity, color vision, depth perception, eye movements, visual perception and reaction time often play even more crucial roles in an athlete's success than visual acuity. (aoa.org)
The results of the research showed no improvement in visual acuity or night vision. (blufftonicon.com)
As a result, each of our VF2000 devices perform all the industry standard, reliable visual field testing while being more accessible and convenient than the old standard HFA, plus, a growing number of advanced vision tests can be added to 2 of the 3 models, helping you gather more information about your patients' vision more efficiently than ever before. (micromedinc.com)
Children with brain tumors can present visual impairments like decreased visual acuity and contrast sensitivity (CS), loss of color vision, and visual field loss such as hemianopias ( 1 - 5 ). (frontiersin.org)
A new study published in Vision Research has highlighted that contrast sensitivity can be enhanced by light in a specific spectrum. (aop.org.uk)
The Symfony produces better levels of distance and intermediate visual acuity, whereas the trifocal IOLs produced better near vision. (scirp.org)
Stimulating the visual cortex of the brain for 20 minutes with a mild electrical current can improve vision for about two hours, and those with worse vision see the most improvement, according to a Vanderbilt University study published this week in Current Biology . (labmanager.com)
Visual Acuity: What is 20/20 Vision? (visioncenter.org)
In contrast, visual acuity is our direct, central vision. (visioncenter.org)
All of these visual components are necessary to have normal, functional vision. (visioncenter.org)

Guessing ensures the use of the three-alternative, forced-choice test method, known to improve the accuracy of contrast threshold measurement. (academy.org.uk)
Measurement of the various retinal layers allows for objective, quantitative assessment of structural damage in the visual pathway. (aao.org)
The test used in the recent study is more sensitive than a standard eye chart, and gave the researchers a very precise measurement of each subjects' visual acuity. (labmanager.com)
Each session takes approximately 40 minutes and includes the measurement of visual acuity, contrast sensitivity, optical coherent tomography (OCT), MNReading test, fixation eye-tracking task and reading eye-tracking task. (who.int)

This thesis aimed to determine the impact of myopic and hyperopic WFG LASIK on visual acuity, contrast sensitivity, higher order aberrations and subjective ratings, as well as determine the relationship between these outcome measures. (uwaterloo.ca)
Further investigation is required to determine the impact of higher order aberrations on visual acuity, contrast sensitivity and subjective ratings, as well as the relationship between these measures. (uwaterloo.ca)

It all starts with a comprehensive eye exam with special attention paid to refraction and optimized distance visual acuity," Dr. Edmunds says. (aoa.org)
Then, they perform a refraction to see what your visual acuity is with your eyeglass prescription , which is your corrected visual acuity . (visioncenter.org)

Visual fields, measured by binocular Esterman and monocular Humphrey full-field analyses, improved in case 1. (frontiersin.org)

A new study, published in the December issue of American Journal of Kidney Diseases , the official journal of the National Kidney Foundation, suggests that elderly dialysis patients suffer high rates of visual impairment. (medscape.com)
A surprising 39% of study participants were found to have significant visual impairment, compared to 28% of healthy people over 70 who experience irreparable visual damage. (medscape.com)
Co-investigator Vanita Jassal, MD, expected that dialysis patients would have a high rate of visual impairment due to the large percentage of this population that suffers from diabetes and hypertension, two conditions that are strongly associated with visual loss. (medscape.com)
The lack of awareness that individuals presented about the visual impairment caused by smoking cannabis indicates that public health campaigns may be necessary. (earth.com)
AMD is one of the leading causes of visual impairment in the United States. (nutritionaloutlook.com)

4 , 6-10 Furthermore, most interventional trials have shown that supplementation with the macular carotenoids impacts positively on visual function in subjects with and without retinal disease, 11-16 and it appears that supplementation with all three macular carotenoids offers advantages over formulations containing only two of these three nutrients. (bmj.com)
Our study demonstrates a circadian rhythm of contrast sensitivity that peaks during the daytime, and that its regulation involves interactions of D4Rs, the clock gene Npas2 , and the clock-controlled gene adenylyl cyclase 1 ( Adcy1 ) in a subset of retinal ganglion cells (RGCs). (jneurosci.org)
Hence, we have identified a circadian clock mechanism in a subset of RGCs that modulates an important aspect of retinal physiology and visual processing. (jneurosci.org)
However, the underlying cellular and molecular mechanisms through which retinal dopamine modulates contrast sensitivity have not been elucidated. (jneurosci.org)
Both these transforms are mappings of the hemi-retinal image, and are achieved by known connectivity in the visual system. (paulbourke.net)
Visually evoked accessible target for evaluating MS therapies that potentials, visual 﫿eld, retinal nerve 﫿ber layer (RNFL) aim to restore neurological function. (deepdyve.com)

Binocular visual acuity and contrast sensitivity at 2.5% contrast were also measured. (bmj.com)
Before first eye surgery binocular visual acuity was strongly associated with VRQOL. (biomedcentral.com)

Visual evoked potentials may be abnormal even when visual acuity is normal and when MRI of the optic nerve reveals no abnormalities. (medscape.com)
Ophthalmologic findings of AD include visual field deficits, decreased contrast sensitivity, impaired oculomotor function, and abnormal viewing behavior. (aao.org)
Abnormal contrast sensitivity was ob- retinopathy, mild, moderate, severe, or very served in 27.1% of eyes with diabetic retin- severe non-proliferative diabetic retinopa- opathy, compared with 9.0% in unaffected thy (NPDR), early proliferative diabetic eyes. (who.int)

During active treatment, serial eye exams including assessment of the optic nerve appearance and static perimetry are essential to follow the visual function of these patients. (medscape.com)
Every eye exam includes an assessment of visual acuity. (micromedinc.com)

The visual acuity measurements. (who.int)

If left untreated, chronic papilledema may lead to secondary progressive optic atrophy, visual field loss, and ultimately blindness. (medscape.com)
A. 1.5 Tesla, contrast-enhanced spin echo T1-weighted, fat-suppressed coronal MRI through the orbits shows enlargement and contrast enhancement of the left optic nerve in the retrobulbar portion (arrow). (medscape.com)
Brain tumor and its treatment can affect the visual system at different levels, from the optic nerves (through compression or infiltration), to subcortical structures like the superior colliculus (SC) and lateral geniculate nuclei (LGN) to optic tracts, optic radiations, and visual cortices ( 1 - 4 ). (frontiersin.org)

There is still controversy about the effec- correction of the refractive error, the con- tiveness of contrast sensitivity as a screen- trast sensitivity was evaluated with a Cam- ing tool for diabetic retinopathy [12-17]. (who.int)

Questionnaires, eye examinations (visual acuity, contrast sensitivity at 2.5% and 1.25% contrast, slit lamp biomicroscopy, and pachymetry), and industrial hygiene monitoring for DMIPA and DMAE were performed over a two week period. (cdc.gov)

For uncorrected visual acuity, you will be asked to remove your glasses or contact lenses and stand or sit 20 feet (6 meters) from the eye chart. (medlineplus.gov)
When you have an eye examination, the eye doctor measures your visual acuity without glasses or contact lenses, called uncorrected visual acuity . (visioncenter.org)

It is an effective agent for lowering ICP, and it was shown to improve the visual function of patients with IIH in a randomized, controlled, clinical trial. (medscape.com)
Corticosteroids should only be considered on a very short-term basis in patients who present with marked loss of visual function. (medscape.com)
Patients presented with visual field loss or cranial neuropathies require evaluation for structural lesions. (researchgate.net)
Visual evoked potentials (VEPs) can be considered in patients in whom a diagnosis of ON is suspected. (medscape.com)
They experienced improvements in glare recovery, contrast sensitivity and visual acuity, compared with patients taking the placebo. (nutraingredients.com)
This continued commitment has allowed MMD to provide eye doctors with the latest in cutting-edge technological innovations to provide the best care to their patients, including their line of market-leading VR-based visual field wearables. (globenewswire.com)
Case Report: Visual Rehabilitation in Hemianopia Patients. (frontiersin.org)
Visual field loss is frequent in patients with brain tumors, worsening their daily life and exacerbating the burden of disease, and no supportive care strategies exist. (frontiersin.org)
In this case series, we sought to characterize the feasibility and potential effectiveness of a home-based visual rehabilitation program in hemianopia patients using immersive virtual-reality stimulation. (frontiersin.org)
Two patients, one with homonymous hemianopia and the other with bitemporal hemianopia, consecutive to pediatric brain tumors, with no prior visual rehabilitation performed 15 min of home-based audiovisual stimulation every 2 days for 6 weeks (case 2) and 7 weeks (case 1) between February and August 2020. (frontiersin.org)
This is the first report of a home-based virtual-reality visual rehabilitation program for adult patients with hemianopia consecutive to a pediatric brain tumor. (frontiersin.org)
Hemianopia patients present difficulties in detecting stimuli in the defective visual field and show defective scanning and exploration ( 6 ). (frontiersin.org)
Patients with hemianopia naturally develop oculomotor strategies (more saccades toward the blind field) to compensate for visual field loss ( 8 , 9 ), but visual rehabilitation procedure must still be developed to optimize/improve visual perception in the blind field and enhance the quality of life. (frontiersin.org)
Here, we report, for the first time, the feasibility and potential effectiveness of a visual rehabilitation procedure consecutive to a pediatric brain tumor in two young adult patients with hemianopia. (frontiersin.org)
Adult patients with MS-related chronic visual loss of at least one eye [visual acuity (VA) below 0.5 decimal chart] were randomized 2:1 to oral MD1003 300 mg/day or placebo. (deepdyve.com)
Conclusions MD1003 did not signi﫿cantly improve VA compared with placebo in patients with MS experiencing 1 Introduction chronic visual loss. (deepdyve.com)
Thus a Loss of low-frequency contrast sensitivity total number of 154 eyes of 80 patients were has been reported to reduce the ability to evaluated. (who.int)
Visual evoked potentials (VEPs) are an important means of evaluating patients with suspected ON. (medscape.com)
Visual outcome was worse for HIV-positive patients than for HIV-negative patients (p = 0.0139). (cdc.gov)

The tester records the results to produce a contrast sensitivity function (CSF) or curve. (academy.org.uk)
Therefore, the diabetes, mode of control and last blood contrast sensitivity function curve gives glucose level, checked in the past month. (who.int)

All 3 devices come equipped with more than 20, threshold, static and kinetic visual field protocols plus neuro testing, ptosis testing, and the Esterman binocular test. (micromedinc.com)

Purpose To investigate the relationship between macular pigment (MP) and visual function in subjects with early age-related macular degeneration (AMD). (bmj.com)

Conclusions MP relates positively to many measures of visual function in unsupplemented subjects with early AMD. (bmj.com)
The CREST trial will investigate whether enrichment of MP influences visual function among those afflicted with this condition. (bmj.com)
Several hypotheses (eg, the acuity hypothesis, 3 glare hypothesis, 4 visibility hypothesis 5 ) have been put forward to explain how MP may influence visual function. (bmj.com)
In general, cross-sectional studies have shown positive and statistically significant relationships between MP and visual function. (bmj.com)
If visual function deteriorates while on maximal medical therapy, surgical intervention should be strongly considered. (medscape.com)
Visual function begins to improve 1 to several weeks after onset, even without any treatment. (medscape.com)
Contrast sensitivity is a very important measure of visual function, especially in situations of low light, fog or glare, when the contrast between objects and their background is often reduced. (allaboutvision.com)
The function of the LGS mapping is to provide each point in the retinotopic image with a representation of the entire visual hemi-field. (paulbourke.net)
Currently, IOLs are able to compensate not only for spherical errors, but also for astigmatism and presbyopia, providing a complete restoration of the visual function with high levels of spectacle independence. (scirp.org)
Although visual acuity is the most widely used test to assess the state of visual function, there are other metrics that have been demonstrated to be more important for certain everyday tasks, for example, driving or reading. (earth.com)
According to the questionnaires we gave to the participants, about two thirds are aware of the negative effect of cannabis on their visual function, although very few indicate that it affects them to any great extent. (earth.com)

The low frequencies test sensitivity to very large objects, while on the other end, high frequencies measure sensitivity to very small objects. (academy.org.uk)
The contrast experiment was notable because they found that the stimulation only improved contrast sensitivity at frequencies also associated with visual acuity, indicating that it was just the subjects' visual acuity that was being affected, not the contrast sensitivity. (labmanager.com)

The mappings described allow those properties of the visual field which can be predicted on the basis of spatial contiguity (texture, orientation, colour, contrast) to be available as response properties over the entire visual field. (paulbourke.net)

These visual field defects in children affect their psycho-social and educational development with long-term debilitating effects. (frontiersin.org)

Schrödinger (1926) put forth an equation for binocular brightness and contrast combination where each monocular input is weighted by the ratio of the signal strength from that eye to the sum of the signal from both eyes. (wikipedia.org)

Furthermore, the BAMCA has enabled the identification of core metrics of other functional visions, such as visual acuity and contrast sensitivity, and addressed technological challenges. (xjtlu.edu.cn)

Lab Experiences and Q&A Get a quick, in-depth overview of commonly used and talked about research experiments through engaging and easy-to understand visual demonstrations. (fightingblindness.org)

Purpose of Review Concussion frequently results in visual symptoms, necessitating careful neuro-ophthalmic examination. (researchgate.net)
In addition, a complete neurological examination, cranial magnetic resonance imagining, visuel field analyze and visual evoked potential were also performed. (hindawi.com)

The prevailing belief is that the current might simply be boosting the visual signals so certain neurons can process them more rapidly, but Reinhart thinks it's also possible that the current essentially injects white noise into the visual system, which drowns out extraneous information and enables the brain to capture visual information more easily. (labmanager.com)

The contrast decreases from one triplet to the next. (academy.org.uk)
There were no symptoms or decreases in contrast sensitivity after exposure to a TEA concentration of 3.0 mg/m3. (bmj.com)

Our results indicate that the contrast sensitivity rhythm is modulated by D4Rs via a signaling pathway that involves NPAS2-mediated circadian regulation of Adcy1 . (jneurosci.org)
Our results could help generate a better understanding of the visual changes related to cannabis use and their implications for everyday tasks, raising awareness among users of the risks involved consuming this drug," concluded the researchers. (earth.com)
The only conflicting results were reported from a study which found that change in visual acuity and disability glare but not contrast sensitivity were associated with change in VRQOL [ 11 ]. (biomedcentral.com)

By combining the information received in each eye, binocular summation can improve visual acuity, contrast sensitivity, flicker perception, and brightness perception. (wikipedia.org)
We show the feasibility in real-world conditions and potential effectiveness of such technology on visual perception and quality of life. (frontiersin.org)

visual field. (college-optometrists.org)
The local mapping implies that the lateral connections in lamina 4B preserve the topographic ordering of the visual hemi-field. (paulbourke.net)
The core proposition is the existence of two, topographically identical mappings of the visual field to the primary visual cortex, which define the geometrical organisation of orientation preference and drive the formation of patchy connectivity in the supragranular layers. (paulbourke.net)
The National Federation of the Blind (NFB) estimated 1.75 million people in the United States are legally blindcentral visual acuity of 20/200 or less in the better eye with the best possible correction, or a visual field of 20 degrees or less. (naturalproductsinsider.com)
When we first released the original VF2000 visual field headset - the first of its kind on the market - we created a best-in-class visual field-testing device that was more efficient, reliable, and accessible at a fraction of the price of conventional tools. (micromedinc.com)
While MMD has a long history of leading the global market with portable biometry devices like the PalmScan K2000 Direct View, they also produce one of the leading technology lines in the VR-based visual field testing - the VF2000 visual field headset . (globenewswire.com)
The VF2000 headsets provide doctors with the ability to get visual field testing done quicker, easier, and more comfortable for the patient than ever before. (globenewswire.com)
Xu P, Lesmes LA, Yu D, Lu Z, "Evaluating the performance of the qVFM method in mapping the visual field of simulated observers with eye diseases", Front. (xjtlu.edu.cn)

A practical measure of binocularity is the binocular summation ratio BSR, which is the ratio of binocular contrast sensitivity to the contrast sensitivity of the better eye. (wikipedia.org)
Visual acuity in the better eye was the only visual measure associated with increased risk of a fall (p=0.038). (bmj.com)

The scientists found that contrast sensitivity was enhanced when the amount of stimulation of melanopsin cells increased by using light in a special spectrum. (aop.org.uk)
This kind of stimulation can improve cognitive processing in other brain areas, so if we stimulate the visual system, could we improve processing? (labmanager.com)
They also measured how the stimulus changed the speed with which the brain processed visual information and whether the stimulation also improved the subjects' contrast sensitivity-their ability to differentiate between multiple shades of gray. (labmanager.com)

Each test frequency begins with a high level of contrast, which diminishes progressively with each succeeding patch. (academy.org.uk)
What is a contrast sensitivity test? (allaboutvision.com)
A contrast sensitivity test measures your ability to distinguish between finer and finer increments of light versus dark (contrast). (allaboutvision.com)
This differs from common visual acuity testing in a routine eye test , which measures your ability to recognise smaller and smaller letters on a standard eye chart. (allaboutvision.com)
Contrast sensitivity testing often isn't included in a routine eye test. (allaboutvision.com)
Your optometrist might perform the test because of a specific visual complaint you have or because he or she suspects you have a condition that is affecting your ability to discern contrast. (allaboutvision.com)
Other, more sophisticated devices also may be used to test your contrast sensitivity. (allaboutvision.com)
If your optometrist determines that you need a contrast sensitivity test, it likely will be administered after a standard visual acuity test and before your pupils are dilated . (allaboutvision.com)

After exposure to TEA at 6.5 mg/m3 two subjects experienced symptoms, and contrast sensitivity had decreased in three of the four subjects. (bmj.com)

Targeted disruption of the gene encoding D4Rs reduces the amplitude of the contrast sensitivity rhythm by reducing daytime sensitivity and abolishes the rhythmic expression of Npas2 and Adcy1 mRNA in the ganglion cell layer (GCL) of the retina. (jneurosci.org)

Distance and near visual acuities were evaluated. (lww.com)
Visual acuity is how clearly you see at a specific distance. (visioncenter.org)

On the other hand, our adoption of the criterion of 70% as the cutoff for acceptable sensitivity and specificity was arbitrary. (cdc.gov)

Anatomy24

Organisms5

Diseases69

Chemicals and Drugs17

Analytical, Diagnostic and Therapeutic Techniques and Equipment73

Psychiatry and Psychology42

Phenomena and Processes35

Disciplines and Occupations5

Anthropology, Education, Sociology and Social Phenomena1

Technology, Industry, Agriculture2

Humanities1

Information Science3

Named Groups1

Health Care17

Geographicals1

Standard Snellen visual acuity chart2

Including best corrected visual acuity2

BCVA2

Terms of visual acuity2

Snellen3

Ocular11

Near visual acuity2

Glare sensitivity3

Normal visual acuity3

Outcomes9

Cataract14

Stereopsis2

Deficits in contrast sensitivity1

Improves4

Poor contrast sensitivity2

Glaucoma5

Patient's visual2

LogMAR3

Pelli-Robson2

Defocus curve2

Significantly4

Better contrast sensitivity2

Good contrast sensitivity1

Bilateral1

Vision28

Measurement4

Aberrations2

Refraction2

Measured by binocular1

Impairment5

Retinal6

Binocular visual2

Abnormal3

Assessment2

Measurements1

Optic3

Diabetic retinopathy1

Slit lamp1

Glasses or contact lenses2

Patients19

Curve2

Kinetic visual1

Macular1

Function11

Frequencies2

Colour1

Defects1

Monocular1

Functional1

Experiments1

Examination2

Neurons1

Decreases2

Results3

Perception2

Field8

Measure2

Stimulation3

Test8

Symptoms1

Retina1

Distance2

Cutoff1