• Low contrast sensitivity can be a symptom of certain eye conditions or diseases such as cataracts , glaucoma or diabetic retinopathy . (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)
  • The CSV-1000E provides a full contrast sensitivity curve, which is very useful for the evaluation of ocular disease (particularly cataracts, glaucoma, optic neuritis, diabetes and macular degeneration), contact lenses and refractive surgery. (jutronvision.com)
  • Contrast sensitivity evaluates how well a person can distinguish an object from its background and it is an often overlooked symptom of glaucoma. (optometrytimes.com)
  • Although structural integrity and functional performance remained relatively unchanged, the improvement in glare affected mesopic [contrast sensitivity] is noteworthy, particularly in the context of the glare-related symptoms known to affect people with glaucoma. (ophthalmologyadvisor.com)
  • Reduced visual contrast sensitivity is often a symptom of a more serious eye condition, such as cataracts, glaucoma, or macular degeneration. (ialvs.com)
  • Glaucoma raises contrast detection thresholds, but our natural visual environment is dominated by high contrast that may remain suprathreshold in early to moderate glaucoma. (brad.ac.uk)
  • This study investigates the effect of glaucoma on the apparent contrast of visible stimuli. (brad.ac.uk)
  • Contrast detection thresholds for Gabor stimuli (SD, 0.75°) of four spatial frequencies (0.5, 1.0, 2.0, and 4.0 c/deg) were first measured at 10° eccentricity, both within and outside of visual field defects for participants with glaucoma. (brad.ac.uk)
  • Despite decreased contrast sensitivity, people with glaucoma perceive the contrast of visible suprathreshold stimuli similarly to healthy controls. (brad.ac.uk)
  • Bham HA, Dewsbery SD and Denniss J (2020) Unaltered perception of suprathreshold contrast in early glaucoma despite sensitivity loss. (brad.ac.uk)
  • 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)
  • Determine the CS thresholds in terms of a contrast percentage under the following conditions. (academy.org.uk)
  • We found that contrast thresholds were lower than in a control condition without inducers, and that the threshold reduction was independent of the contrast polarity of the inducers. (mpg.de)
  • The Pelli-Robson chart utilises letters of the same size but with reducing contrast to provide a quick means of assessing patient contrast sensitivity thresholds. (veatchinstruments.com)
  • Overall, contrast thresholds for the migraine group were lower than those in the control group. (jordiasher.org)
  • In most cases, people with cataracts notice a significant improvement in both visual acuity and contrast sensitivity after cataract surgery. (allaboutvision.com)
  • The patient can be easily screened in the examination chair for ETDRS acuity and contrast sensitivity. (jutronvision.com)
  • After the primary evaluation, iPad-based stereo acuity and contrast sensitivity tests were conducted using the subject's existing refractive correction. (tionet.in)
  • The visual acuity and contrast sensitivity were measured before and after PTK. (jkos.org)
  • Optical quality is a subjective construct that can only be described indirectly by objective metrics such as wavefront error measurements and visual quality metrics or functional data like visual acuity and contrast sensitivity. (hindawi.com)
  • 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)
  • 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)
  • Poor contrast sensitivity is easiest to notice while driving at night or in foggy conditions where light may reflect and create a glare. (paragoneyes.com)
  • Navigating spaces with stairs or curbs is similarly risky when you have poor contrast sensitivity. (nvisioncenters.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)
  • 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)
  • [ 1 ] although permanent residual deficits in color vision and contrast and brightness sensitivity are common. (medscape.com)
  • Results were similar in sensitivity analyses excluding those with cataract, age-related macular degeneration, or visual acuity impairment. (nycu.edu.tw)
  • Sensitivity analyses were performed using different kidney function surveillance definitions. (cdc.gov)
  • Treating clinic remained a significant predictor of kidney function surveillance in all sensitivity analyses. (cdc.gov)
  • Contrast sensitivity is one of the components of visual function, which is affected even in early subclinical stages of various eye diseases, including diabetic retinopathy. (amtsibiu.ro)
  • We present theoretical and practical aspects related to the evolution of contrast sensitivity before and after laser photocoagulation in diabetic retinopathy. (amtsibiu.ro)
  • 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)
  • People with reduced visual contrast sensitivity may be able to read normally if the letters are dark and the background is light, or vice-versa. (ialvs.com)
  • As with reading, poor visual contrast sensitivity doesn't affect the ability to see objects, except when these objects are the same or similar colors as their surroundings. (ialvs.com)
  • Q: What Causes Reduced Visual Contrast Sensitivity? (ialvs.com)
  • Difficulties with visual contrast sensitivity tend to be a symptom of another ocular problem. (ialvs.com)
  • Q: How Can Visual Contrast Sensitivity Be Improved? (ialvs.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)
  • 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)
  • Prior to assessing contrast sensitivity (CS) determine distance vision/visual acuity using the Snellen chart. (academy.org.uk)
  • Median contrast sensitivity was 1.30 log units (range, 1.05 to 1.65 log units) with the PR chart and 1.35 log units (range, 1.00 to 1.90 log units) with FrACT. (arvojournals.org)
  • None of the studies using the standard high contrast E Chart detected any vision loss. (vectorvision.com)
  • The CSV-1000E contrast sensitivity chart test face is the most widely used contrast sensitivity test in the world. (jutronvision.com)
  • The CSV-1000E Contrast Sensitivity Chart 1 provides randomized locations for the grating targets. (jutronvision.com)
  • Binocular contrast sensitivity function was measured with the Optec 6500 FACT contrast sensitivity chart at distance and at three lighting conditions (85 cd/m2 and 3 cd/m2 with and without glare) in 36 eyes of 18 patients implanted with the AcrySof ReSTOR aspheric SN6AD3 IOL and 40 eyes of 20 patients implanted with the Acri.LISA 366D IOL. (fernandez-vega.com)
  • The chart luminance was regularly checked acuity and Cambridge low-contrast grating using a spot photometer. (who.int)
  • If symptoms are present, your IALVS low vision eye doctor will provide you with treatment options, such as visual aids and devices to help you improve contrast sensitivity. (ialvs.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)
  • 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)
  • Spatio-temporal and temporal contrast sensitivity curves calculated with the model are compared with measurements published in literature. (spie.org)
  • Comparison between the role of spatial and temporal contrast sensitivities in the association with reading may provide insight into how visual tasks (such as reading) are related to primary optical or neural (or both) effects. (amplifyeye.care)
  • The contrast sensitivity was measured in mesopic and photopic background luminances, with glare (G) levels of 0-2 (G0, G1, and G2, respectively) and spatial frequencies at 1.5, 3, 6, 12, and 18 cycles per degree (cpd). (jkos.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)
  • These bars can vary in width (spatial frequency) as well as contrast from target to target, to give a more thorough evaluation of how sensitive your eyes are to differences in contrast. (allaboutvision.com)
  • Objective This study aimed to determine which colour contrast sensitivity differences exist in early to advanced age-related macular degeneration (AMD) and examine the potential utility of the King-Devick Variable. (kingdevicktest.com)
  • Contrast sensitivity is a measurement of your ability to discern subtle differences between two objects. (nvisioncenters.com)
  • When the first postoperative examination was not considered, there were no statistically significant differences in contrast sensitivity values at different postoperative periods . (bvsalud.org)
  • The AcrySof ReSTOR SN6AD3 and Acri.LISA aspheric IOLs provided contrast sensitivity within normal range under photopic conditions and a reduction in contrast sensitivity under mesopic conditions, with no significant differences between the two brands. (fernandez-vega.com)
  • Purpose: To determine if incidence of contrast sensitivity (CS) impairment differs by generation and identify factors to explain these differences. (nycu.edu.tw)
  • The contrast is represented by a numeric value named average gradient, and can be determined by density differences in two areas of a radiograph. (bvsalud.org)
  • After surgery, contrast sensitivity and wavefront measurements as well as tilt and decentration measurements were performed. (hindawi.com)
  • Measurements on the negative portion of the x-axis are beyond the visual range when specimens were diluted 1:250, yet still detectable by thermal contrast. (cdc.gov)
  • However, sensitivity to achromatic contrasts - the ability to discern luminance difference between two objects or an object and its background - has been shown to be lower in birds compared with other vertebrates. (lu.se)
  • We conducted a comparative study to evaluate the achromatic contrast sensitivity of 32 bird species from 12 orders using the optocollic reflex technique. (lu.se)
  • We found a low achromatic contrast sensitivity for all avian species studied compared with other vertebrates (except small mammals), with high variability between species. (lu.se)
  • A statistically significant increase in mesopic contrast sensitivity under glare conditions was noted at 18 months in the treatment group, but not in the placebo group. (ophthalmologyadvisor.com)
  • The grating contrast or spatial frequency for which 50% of infants gave a statistically significant VEP was taken as a measure of threshold. (ox.ac.uk)
  • Guessing ensures the use of the three-alternative, forced-choice test method, known to improve the accuracy of contrast threshold measurement. (academy.org.uk)
  • Each correct letter has a contrast threshold value of 0.05 log units however scoring in terms of log units is reserved for research. (academy.org.uk)
  • The results suggest that the reduction of contrast threshold in contour gaps is independent of the brightness perceived in these gaps and of the formation of an illusory figure. (mpg.de)
  • Processes that cause contrast threshold reduction in contour gaps also seem to operate independently of figural completion. (mpg.de)
  • Contrast sensitivity defines the threshold between the visible and invisible, which has obvious significance for basic and clinical vision science. (nyu.edu)
  • Fechner's 1860 review reported that threshold contrast is 1% for a remarkably wide range of targets and conditions. (nyu.edu)
  • Subsequently, the contrast of a central Gabor was matched to that of a peripheral Gabor with contrast fixed at two times or four times the detection threshold. (brad.ac.uk)
  • The contrast sensitivity is measured in log MAR units, and the score expresses the reciprocal of the threshold contrast using the Weber contrast ratio. (tionet.in)
  • For reference stimuli at four times the detection contrast, matched contrast ratios were similar across all three groups (P = 0.58). (brad.ac.uk)
  • These results are consistent with the findings reported by Shepherd (2011), in showing enhanced contrast sensitivity in migraine with aura for small, rapidly presented targets, and no difference in the lateral interactions between target and mask stimuli compared with a control group. (jordiasher.org)
  • 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)
  • These high light levels tend to saturate the retina and therefore decrease finer levels of contrast sensitivity. (aao.org)
  • The major function of dark (gray, green, or brown) sunglasses is to allow the retina to remain at its normal level of contrast sensitivity. (aao.org)
  • The contrast sensitivity function (CSF) is routinely assessed in clinical evaluation of vision and is the primary limiting factor in how well one sees. (nature.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 tester records the results to produce a contrast sensitivity function (CSF) or curve. (academy.org.uk)
  • The aim of this study was to characterize the contrast sensitivity function (CSF) of adolescents and young adults. (bvsalud.org)
  • The spectral response of S-cones peak at 420 nm, M-cones at 534 nm, and L-cones at 564 nm, with significant overlap in their spectral response ranges and varying degrees of sensitivity at these range of wavelengths specified by the function m k (λ), k = r, g, b, as depicted in Figure 2.1(a) . (informit.com)
  • where m k (λ) is the wavelength sensitivity function (also known as the color matching function) of the k th cone type or color sensor. (informit.com)
  • Contrast sensitivity, the ability to distinguish the relative difference in luminance of an object from its surrounding or adjacent objects, is a useful measure of visual function. (jkos.org)
  • We compared the contrast sensitivity of GCD2 patients before and after phototherapeutic keratectomy (PTK) to evaluate the perioperative visual function in these patients. (jkos.org)
  • There are numerous variants of the LEA test which can be used to assess the visual capabilities of near vision and distance vision, as well as several other aspects of occupational health, such as contrast sensitivity, visual field, color vision, visual adaptation, motion perception, and ocular function and accommodation (eye). (wikipedia.org)
  • 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)
  • Therefore, the diabetes, mode of control and last blood contrast sensitivity function curve gives glucose level, checked in the past month. (who.int)
  • Both IOLs provided contrast sensitivity within the normal range in photopic conditions. (fernandez-vega.com)
  • If the eye doctor identifies a problem with contrast sensitivity, the main form of treatment is to treat the underlying condition, which usually improves contrast responsiveness as well. (ialvs.com)
  • Each row or circular grouping of patches tests at a specific spatial frequency (cycles per degree), which measures the observer's sensitivity to a particular object size. (academy.org.uk)
  • Spatial frequency had a minimal effect on matched contrast ratios. (brad.ac.uk)
  • 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)
  • At the recent ARVO meeting in Seattle, a number of vision scientists described studies in which significant vision loss could not be detected by standard visual acuity, but could be detected by contrast sensitivity and glare testing. (vectorvision.com)
  • The Pelli Robson test was designed specifically to determine if a patient has difficulties with contrast sensitivity. (ialvs.com)
  • We then performed an analysis to test for potential variability in contrast sensitivity depending on the corneal diameter to the axial length ratio, a proxy of the retinal image brightness. (lu.se)
  • It shares with optical imaging, that it uses non-ionizing radiation and provides higher contrast and higher sensitivity than ultrasound imaging. (utexas.edu)
  • This reduction cannot be explained by a simple summation of stimulus contrast and induced brightness. (mpg.de)
  • Figures 3 and 4 below are great examples of what can be detected when utilizing tube to detector distance reduction to increase contrast. (4nsi.com)
  • Under low lighting conditions, a reduction in contrast sensitivity for both lenses, particularly at higher spatial frequencies, was noted. (fernandez-vega.com)
  • The CSV-1000-1.5CPD is a special test face designed specifically for Food and Drug Administration clinical trials which require the testing of contrast sensitivity at 1.5 cycles/degree under mesopic lighting conditions. (jutronvision.com)
  • We examined the contributions of brightness enhancement, illusory figure formation and figural completion to changes in contrast sensitivity in contour gaps. (mpg.de)
  • However, if the letters and the background are of a similar color or level of brightness or faintness, people with reduced visual sensitivity may struggle to read the text. (ialvs.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)
  • These results suggest that the process of development and maturation of the visual perception of contrast interacts differently with the mechanisms that process spatial frequencies. (bvsalud.org)
  • This results in better contrast resolution while giving up some pixel resolution. (4nsi.com)
  • These results suggest possible compensation for sensitivity loss in the visual system. (brad.ac.uk)
  • These results suggest that tumor microvasculature can be detected using HiSS imaging without the use of contrast agents. (ox.ac.uk)
  • Sensitivity to tumor microvasculature without contrast agents in high spectral and spatial resolution MR images. (ox.ac.uk)
  • This research investigated whether high spectral and spatial resolution (HiSS) MRI detects tumor vasculature without contrast agents, based on the sensitivity of the water resonance line shape to tumor blood vessels. (ox.ac.uk)
  • A more user friendly approach is to score in terms of contrast percentage. (academy.org.uk)
  • A number of studies have shown that aspherical IOLs perform better compared to conventional spherical ones in terms of contrast sensitivity (CS), particularly under mesopic conditions [ 2 , 3 ]. (hindawi.com)
  • The VCTS uses highly controlled advanced photographic and printing techniques to present a series of sine-wave gratings at carefully calibrated levels of contrast. (academy.org.uk)
  • 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)
  • Changes in contrast sensitivity also can occur after LASIK , PRK and other types of refractive surgery. (allaboutvision.com)
  • Some people who have refractive surgery like LASIK may also experience this problem, although some actually report improved sensitivity. (paragoneyes.com)
  • In GCD2 patients, the contrast sensitivity increased significantly after PTK. (jkos.org)
  • Contrast sensitivity of blast-exposed animals decreased significantly by 20% 1 day after blast and did not recover by 8 weeks. (cdc.gov)
  • In this study, a wide range of short experiments with contrasted specifications of the observation error and soil moisture background were conducted. (meteo.fr)
  • proposed three decades ago that human frequency sensitivity may derive from the augmentation necessary for more effective retinal picture interpretation. (physiciansweekly.com)
  • For a study, researchers reconsidered the role of low-level vision tasks in explaining contrast sensitivity functions (CSFs) in light of the current trend of employing artificial neural networks for vision research and the current understanding of retinal image representations. (physiciansweekly.com)
  • As an illustration, the best CNN (in the collection of basic architectures examined for retinal signal augmentation) reproduced the CSFs with a root mean square error of 11% of the maximal sensitivity. (physiciansweekly.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)
  • However, the underlying cellular and molecular mechanisms through which retinal dopamine modulates contrast sensitivity have not been elucidated. (jneurosci.org)
  • 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)
  • Please review the images and text below to learn about the various contrast sensitivity test faces that can be used with the CSV-1000. (jutronvision.com)
  • The blinking square contrast sensitivity test involves showing the patient target squares at various contrast levels in different quadrants of the screen. (tionet.in)
  • 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)
  • 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)
  • 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)
  • Each test frequency begins with a high level of contrast, which diminishes progressively with each succeeding patch. (academy.org.uk)
  • Can Your Eyes Pass The Contrast Sensitivity Test? (thedailypolls.com)
  • The following test is based on tests issued by eye doctors in order to test a patient's ability to recognize changes in contrast. (thedailypolls.com)
  • The test was named after them, and it's now considered the gold standard in contrast sensitivity measurement. (nvisioncenters.com)
  • The test could be helpful for almost anyone, but some conditions can impact your ability to discern contrast. (nvisioncenters.com)
  • Purpose: To determine whether contrast sensitivity (CS) can represent photophobia in intermittent exotropia (IXT) by comparingthe CS test with and without glare stimulus, and to analyze the factors of IXT affecting CS. (kyobobook.co.kr)
  • However, in this test, instead of shrinking in size with each descending row, the letters show less contrast, appearing in ever weaker shades of gray against a white background. (ialvs.com)
  • The test is divided into six squares, starting with a high-contrast square, and with each subsequent square, the contrast is reduced in increments of 0.3 log MAR units. (tionet.in)
  • A) Prediction of cryptococcal antigen titer based on laser thermal contrast measurement and concept of lateral flow immunochromatographic assay (LFA) thermal contrast measurement in which a laser irradiates the test line in the LFA ( 19 ). (cdc.gov)
  • 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)
  • L'analyse bactériologique du liquide céphalorachidien (LCR) et un test de sensibilité aux antibiotiques de la bactérie mise en culture étaient disponibles dans un tiers des hôpitaux. (who.int)
  • 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)
  • A new study published in Vision Research has highlighted that contrast sensitivity can be enhanced by light in a specific spectrum. (aop.org.uk)
  • A healthy contrast sensitivity level lets you enjoy better vision in various aspects, such as having a normal visual field. (nvisioncenters.com)
  • Generally, reduced contrast sensitivity means having poor vision acuity. (nvisioncenters.com)
  • People who have a hard time distinguishing contrasts can find it difficult to see in the daytime as well. (paragoneyes.com)
  • B) Association of measured semiquantitative LFA cryptococcal antigen (CRAG) titer starting at a 1:250 dilution by the predicted CRAG titer based on thermal contrast measurement. (cdc.gov)
  • Contrast sensitivity , or CS, is the ability of your eyes to distinguish between the foreground and the background. (nvisioncenters.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)
  • People with contrast sensitivity difficulties may start realizing they have a problem if they keep tripping over curbs or steps because they don't see them clearly. (ialvs.com)
  • Se realizó una búsqueda en bases de datos HINARI, PubMed y Scopus en idioma español e inglés, se incluyeron artículos originales y de revisión con un máximo de cinco años desde su publicación. (bvsalud.org)
  • As the vegetation develops from spring to autumn, the sensitivity to meteorological drought increases, across all 7 investigated biomes, although the strength and time scale differs across regions. (lu.se)
  • The stronger association between temporal CS and reading speed is suggested to reflect a high sensitivity for neural integrity of temporal CS. (amplifyeye.care)
  • Contrast sensitivity after posterior chamber phakic intraocular lens implantation for high myopia. (bvsalud.org)
  • To evaluate contrast sensitivity after posterior chamber phakic intraocular lens (PIOL) implantation for the correction of high myopia . (bvsalud.org)
  • In separate blocks of trials, the target was presented alone, or flanked by two additional collinear, high contrast Gabors. (jordiasher.org)
  • We tested whether regions with high contrast in FC images (FCIs) contain vasculature by comparing FCIs with CE-MRI as the "gold standard" of vascular density. (ox.ac.uk)
  • Improved lighting in dialysis units, large magnifiers, and modified educational materials with large type and high contrasts can be inexpensive and effective ways to improve patient functioning. (medscape.com)
  • Common scenarios which require contract sensitivity include driving at night, in the rain or fog, or reading a newspaper, where the writing is printed on a gray background. (ialvs.com)
  • We found that the very act of action video game playing also enhanced contrast sensitivity, providing a complementary route to eyesight improvement. (nature.com)
  • However, the molecular probes used for most of these studies were contrast agents simply adopted from other optical imaging modalities. (utexas.edu)
  • This research allows to create optimized molecular specific contrast enhanced photothermal stable probes which can aid photoacoustic imaging and image guided photothermal cancer therapy. (utexas.edu)
  • 2. FACTOR: MATERIAL DENSITY- Density of material is a key factor in determining whether the contrast sensitivity will be great, average, or poor. (4nsi.com)
  • Less dense materials show better contrast sensitivity than higher density materials. (4nsi.com)
  • Later, the density of those X-rays was measured and the characteristic curves were built in order to determine their sensitometric properties, such as contrast, indicative value of sensibility, and latitude. (bvsalud.org)
  • However, the applicability, importance level, and achievement condition of a radiograph depend on the quality of the image obtained, being a good quality radiograph the one presenting maximum detail, minimum distortion, and medium levels of density and contrast 2 . (bvsalud.org)
  • Observers (28 control, 34 migraine with aura) indicated which of two intervals contained a centrally presented, vertical Gabor target of varying contrast. (jordiasher.org)