Journal articles: 'Contrast sensitivity (Vision)'

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Ginsburg, Arthur P. "Contrast Sensitivity and Functional Vision." International Ophthalmology Clinics 43, no. 2 (2003): 5–15. http://dx.doi.org/10.1097/00004397-200343020-00004.

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Amesbury, Eric C., and Steven C. Schallhorn. "Contrast Sensitivity and Limits of Vision." International Ophthalmology Clinics 43, no. 2 (2003): 31–42. http://dx.doi.org/10.1097/00004397-200343020-00006.

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Van Hateren, J. H. "Spatiotemporal contrast sensitivity of early vision." Vision Research 33, no. 2 (January 1993): 257–67. http://dx.doi.org/10.1016/0042-6989(93)90163-q.

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Jaisankar, Durgasri, Marwan Suheimat, Robert Rosén, and David A. Atchison. "Defocused contrast sensitivity function in peripheral vision." Ophthalmic and Physiological Optics 42, no. 2 (December 12, 2021): 384–92. http://dx.doi.org/10.1111/opo.12932.

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Packer, Mark, I. Howard Fine, and Richard S. Hoffman. "Functional Vision, Contrast Sensitivity, and Optical Aberrations." International Ophthalmology Clinics 43, no. 2 (2003): 1–3. http://dx.doi.org/10.1097/00004397-200343020-00003.

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Thomas, C. W., G. C. Gilmore, and F. L. Royer. "Models of contrast sensitivity in human vision." IEEE Transactions on Systems, Man, and Cybernetics 23, no. 3 (1993): 857–64. http://dx.doi.org/10.1109/21.256556.

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Hodkin, Michael J., Marcel M. Lemos, Marguerite B. McDonald, Jack T. Holladay, and Seyed H. Shahidi. "Near vision contrast sensitivity after photorefractive keratectomy." Journal of Cataract & Refractive Surgery 23, no. 2 (March 1997): 192–95. http://dx.doi.org/10.1016/s0886-3350(97)80341-0.

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RABIN, JEFF. "Quantification of color vision with cone contrast sensitivity." Visual Neuroscience 21, no. 3 (May 2004): 483–85. http://dx.doi.org/10.1017/s0952523804213128.

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Human color vision is based fundamentally on three separate cone photopigments. Hereditary color deficiency, which affects up to 10% of males, results from an absorption shift or lack of L or M cone phototoreceptors. While hereditary S cone deficiency is rare, decreased S cone sensitivity occurs early in eye disease, underscoring the importance of quantifying S cone function. Our purpose is to describe a novel approach for quantifying human color vision based on the photopigments of normal color vision. Colored letters, visible to a single cone type, are presented in graded steps of cone contrast to determine the threshold for letter recognition. This approach quantifies normal color vision, indicates type and severity of hereditary deficiency, and reveals sensitivity decrements in various diseases.

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Annadanam, Anvesh, Jiawei Zhao, Jiangxia Wang, and Allen O. Eghrari. "Effects of Contrast Sensitivity on Colour Vision Testing." Neuro-Ophthalmology 41, no. 4 (May 19, 2017): 182–86. http://dx.doi.org/10.1080/01658107.2017.1295273.

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Niemeyer, James E., and Michael A. Paradiso. "Contrast sensitivity, V1 neural activity, and natural vision." Journal of Neurophysiology 117, no. 2 (February 1, 2017): 492–508. http://dx.doi.org/10.1152/jn.00635.2016.

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Contrast sensitivity is fundamental to natural visual processing and an important tool for characterizing both visual function and clinical disorders. We simultaneously measured contrast sensitivity and neural contrast response functions and compared measurements in common laboratory conditions with naturalistic conditions. In typical experiments, a subject holds fixation and a stimulus is flashed on, whereas in natural vision, saccades bring stimuli into view. Motivated by our previous V1 findings, we tested the hypothesis that perceptual contrast sensitivity is lower in natural vision and that this effect is associated with corresponding changes in V1 activity. We found that contrast sensitivity and V1 activity are correlated and that the relationship is similar in laboratory and naturalistic paradigms. However, in the more natural situation, contrast sensitivity is reduced up to 25% compared with that in a standard fixation paradigm, particularly at lower spatial frequencies, and this effect correlates with significant reductions in V1 responses. Our data suggest that these reductions in natural vision result from fast adaptation on one fixation that lowers the response on a subsequent fixation. This is the first demonstration of rapid, natural-image adaptation that carries across saccades, a process that appears to constantly influence visual sensitivity in natural vision. NEW & NOTEWORTHY Visual sensitivity and activity in brain area V1 were studied in a paradigm that included saccadic eye movements and natural visual input. V1 responses and contrast sensitivity were significantly reduced compared with results in common laboratory paradigms. The parallel neural and perceptual effects of eye movements and stimulus complexity appear to be due to a form of rapid adaptation that carries across saccades.

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ANDERSON, C., and J. SJÖSTRAND. "CONTRAST SENSITIVITY AND CENTRAL VISION IN REATTACHED MACULA." Acta Ophthalmologica 59, no. 2 (May 27, 2009): 161–69. http://dx.doi.org/10.1111/j.1755-3768.1981.tb02975.x.

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Burton, Kerri B., Cynthia Owsley, and Michael E. Sloane. "Aging and neural spatial contrast sensitivity: Photopic vision." Vision Research 33, no. 7 (May 1993): 939–46. http://dx.doi.org/10.1016/0042-6989(93)90077-a.

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Singh, Sachitanand, Renu Thakur, Diksha Kumari, Prachi Yadav, and Bipina Gautam. "Comparison of Stereopsis, Contrast Sensitivity and Near Points of Accommodation In Patients With Degree of Myopia." Journal of Multidisciplinary Research in Healthcare 7, no. 2 (April 14, 2021): 53–58. http://dx.doi.org/10.15415/jmrh.2021.72005.

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Background: Stereopsis is the ability to perceive depth in objects through binocular vision, where the brain interprets 2-dimensional retinal images as 3-dimensional shadows. It plays a crucial role in assessing and understanding the objects we see. Factors like sensory and motor fusion greatly influence the quality of stereoscopic vision. Myopia, a condition characterized by near- sightedness, can negatively impact stereopsis. Contrast sensitivity refers to the ability to discern sharp outlines and detect subtle differences in shading and patterns. It helps identify objects with unclear boundaries against their background. Purpose: This study aimed to compare Stereopsis, Contrast Sensitivity, and Near Point of Accommodation among individuals with different grades of Myopia and Emmetropia. Methods: A cross-sectional comparative study was conducted at Nandadeep Eye Hospital, Maharastra, involving staff and patients aged 15 to 30 years. Participants with strabismus, anisometropia, previous ocular surgery, ocular diseases, or systemic conditions were excluded. The assessments included objective and subjective refraction eye examinations, as well as measurements of stereopsis, contrast sensitivity, and near point of accommodation. Results: The results, based on 109 subjects, indicated no significant change in contrast sensitivity between emmetropes and myopes. However, there were significant differences in stereoacuity and NPA among different grades of myopes compared to emmetropes. Conclusions: the study suggests that optometrists and eye healthcare professionals should assess stereopsis and near point of accommodation in severely myopic patients even after optical correction, and consider vision therapy if necessary, as it is an effective treatment for accommodative and binocular vision anomalies.

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Zimmerman, Aaron B., Kimberly L. Lust, and Mark A. Bullimore. "Visual Acuity and Contrast Sensitivity Testing for Sports Vision." Eye & Contact Lens: Science & Clinical Practice 37, no. 3 (May 2011): 153–59. http://dx.doi.org/10.1097/icl.0b013e31820d12f4.

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Motoyoshi, Isamu. "Attentional Modulation of Temporal Contrast Sensitivity in Human Vision." PLoS ONE 6, no. 4 (April 25, 2011): e19303. http://dx.doi.org/10.1371/journal.pone.0019303.

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TRAVIS, DAVID, and PETER THOMPSON. "SPATIOTEMPORAL CONTRAST SENSITIVITY AND COLOUR VISION IN MULTIPLE SCLEROSIS." Brain 112, no. 2 (1989): 283–303. http://dx.doi.org/10.1093/brain/112.2.283.

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Jindra, Lawrence F., and Vance Zemon. "Contrast sensitivity testing: A more complete assessment of vision." Journal of Cataract & Refractive Surgery 15, no. 2 (March 1989): 141–48. http://dx.doi.org/10.1016/s0886-3350(89)80002-1.

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McDonald, Marguerite B., Michael Haik, and Herbert E. Kaufman. "Color Vision and Contrast Sensitivity Testing after Radial Keratotomy." American Journal of Ophthalmology 103, no. 3 (March 1987): 468. http://dx.doi.org/10.1016/s0002-9394(14)77773-6.

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Ilhan, Cagri, Mehmet Ali Sekeroglu, Sibel Doguizi, and Pelin Yilmazbas. "Contrast sensitivity of patients with congenital color vision deficiency." International Ophthalmology 39, no. 4 (March 2, 2018): 797–801. http://dx.doi.org/10.1007/s10792-018-0881-7.

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Danayak, Dr Parul M. "Correlation of colour vision, contrast sensitivity and visual acuity in cases with diabetic macular edema." International Journal of Scientific Research 2, no. 9 (June 1, 2012): 268–70. http://dx.doi.org/10.15373/22778179/sep2013/90.

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Vingopoulos, Filippos, Karen M. Wai, Raviv Katz, Demetrios G. Vavvas, Leo A. Kim, and John B. Miller. "Measuring the Contrast Sensitivity Function in Non-Neovascular and Neovascular Age-Related Macular Degeneration: The Quantitative Contrast Sensitivity Function Test." Journal of Clinical Medicine 10, no. 13 (June 24, 2021): 2768. http://dx.doi.org/10.3390/jcm10132768.

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Age-related macular degeneration (AMD) affects various aspects of visual function compromising patients’ functional vision and quality of life. Compared to visual acuity, contrast sensitivity correlates better with vision-related quality of life and subjectively perceived visual impairment. It may also be affected earlier in the course of AMD than visual acuity. However, lengthy testing times, coarse sampling and resolution, and poor test–retest reliability of the existing contrast testing methods have limited its widespread adoption into routine clinical practice. Using active learning principles, the qCSF can efficiently measure contrast sensitivity across multiple spatial frequencies with both high sensitivity in detecting subtle changes in visual function and robust test–retest reliability, emerging as a promising visual function endpoint in AMD both in clinical practice and future clinical trials.

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Okwori, Onoja Peter, Kato Chaha, Abdu Lawan, and Ugochukwu Anthony Eze. "Contrast sensitivity assessment using the Mars letter contrast sensitivity test." Medical hypothesis, discovery & innovation in optometry 5, no. 1 (April 30, 2024): 10–17. http://dx.doi.org/10.51329/mehdioptometry192.

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Background: Contrast sensitivity (CS) represents an individual’s ability to detect differences in luminance between two areas and is an essential component of vision. Various studies have evaluated the relevance of different charts to assess CS in ophthalmology practice. We evaluated the CS of healthy individuals using the Mars letter CS chart. Methods: In this hospital-based cross-sectional study, we consecutively recruited healthy individuals older than 18 years with unremarkable ocular examinations who attended the general outpatient clinic at Benue State University Teaching Hospital, Makurdi, Nigeria, between March 2021 and July 2022. Each participant was allocated to one of five groups with 10-year age intervals and 1:1 male-to-female ratios. All participants underwent a detailed ophthalmic examination. We tested visual fields using the 24-2 program on a Humphrey visual field analyzer with appropriate refractive correction. Monocular testing of CS with appropriate spectacle correction was performed using a Mars letter CS chart. The tribe, age, and sex of each individual, along with the best-corrected visual acuity (BCVA), intraocular pressure, mesopic pupil size, cup-to-disc ratio (C/D ratio), and mean deviation (MD) of the visual field for each eye were recorded. Results: A total of 100 eyes of 50 patients with a mean (standard deviation [SD]) age of 44.6 (12.8) years and a 1:1 male-to-female ratio were enrolled. The mean (SD) CS score for the 100 included eyes was 1.67 (0.09) log units. The mean (SD) CS score was comparable between sex groups and tribes (both P > 0.05) yet differed significantly between age groups (P < 0.001). We found a significant good inverse correlation between CS score and age (r = - 0.60; P = 0.001), a low inverse correlation with BCVA (r = - 0.29; P < 0.003), and a low direct correlation with C/D ratio (r = + 0.23; P = 0.023); however, we observed no significant correlation with tribe (r = + 0.07; P = 0.053), sex (r = + 0.16; P = 0.123), IOP (r = + 0.07; P = 0.481), mesopic pupil size (r = - 0.02; P = 0.861), and mean deviation of visual field (r = + 0.02; P = 0.873). Conclusions: We observed a progressive decline in the mean CS score in healthy eyes with each decade of increase in age. Our findings are similar to those of previous studies and could be used as reference values for the healthy population among various age groups. However, further studies with larger sample sizes are necessary to encourage clinicians to incorporate CS into routine examinations. Further studies must compare these normative values with those of disease conditions to further understand the clinical application of the CS test.

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Bozorgian, Aliakbar, Marius Pedersen, and Jean-Baptiste Thomas. "Modification and evaluation of the peripheral contrast sensitivity function models." Journal of the Optical Society of America A 39, no. 9 (August 19, 2022): 1650. http://dx.doi.org/10.1364/josaa.445234.

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We propose a series of modifications to the Barten contrast sensitivity function model for peripheral vision based on anatomical and psychophysical studies. These modifications result in a luminance pattern detection model that could quantitatively describe the extent of veridical pattern resolution and the aliasing zone. We evaluated our model against psychophysical measurements in peripheral vision. Our numerical assessment shows that the modified Barten leads to lower estimate errors than its original version.

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M.C., Odinkemelu,, Megwas, A.U., and Azuamah, Y.C. "Effect of Cataract Extraction with Intraocular Lens Implant on Contrast Sensitivity, Colour Vision and Photostress Recovery Time." International Journal of Research and Review 10, no. 2 (February 11, 2023): 295–99. http://dx.doi.org/10.52403/ijrr.20230237.

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A cataract is a cloudy area in the lens of the eye that can lead to a reduction in vision and visual functions. This study was a clinical study aimed at determining the effect of cataract extraction with intraocular lens (IOL) implant on contrast sensitivity, color vision and photostress recovery time. A total of 70 patients who visited Ajeromi General Hospital, Lagos, Nigeria were used for the study. Contrast sensitivity was assessed using the Pelli-Robson contrast sensitivity chart. The colour vision of the subjects was assessed using Ishihara Pseudochromatic colour vision chart and the photostress recovery time was assessed using a bright ophthalmoscope light. Results showed that the mean contrast sensitivity of the subjects before cataract extraction with IOL implant was 1.04±0.08. After cataract extraction, the mean was 2.19±0.07. The mean colour vision test value before cataract extraction with IOL implant was 14.41±0.53. After cataract extraction, the mean was 16.00±0.00. The mean Photostress Recovery Time before cataract extraction with IOL implant was 55.77±1.81 seconds. After cataract extraction, the mean was 29.11±0.83 seconds. SPSS data analysis with the Paired sample T-Test at 0.05 level of significance showed a significant improvement (P<0.05) in contrast sensitivity, color vision and photostress recovery time before and after cataract extraction with IOL implant. It was recommended that all patients with monocular and bilateral cataract be referred for cataract extraction with intraocular lens (IOL) implant. Keywords: Cataract, Intraocular lens, Contrast sensitivity, Color vision, Photostress recovery time

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Katz, Milton, Dean Yager, Alan Lewis, Karl Citek, Nivian Sanchez, and Aries Arditi. "Modulation transfer functions and contrast sensitivity through low vision telescopes." Applied Optics 28, no. 6 (March 15, 1989): 1103. http://dx.doi.org/10.1364/ao.28.001103.

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Price, M. J., R. G. Feldman, D. Adelberg, and H. Kayne. "Abnormalities in color vision and contrast sensitivity in Parkinson's disease." Neurology 42, no. 4 (April 1, 1992): 887. http://dx.doi.org/10.1212/wnl.42.4.887.

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Rae, S., K. Latham, and M. F. Katsou. "Meeting the UK driving vision standards with reduced contrast sensitivity." Eye 30, no. 1 (October 16, 2015): 89–94. http://dx.doi.org/10.1038/eye.2015.188.

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Massof, Robert W., Frank H. Baker, Gislin Dagnelie, Joseph L. DeRose, Suleiman Alibhai, James T. Deremeik, and Craig Ewart. "LOW VISION ENHANCEMENT SYSTEM: IMPROVEMENTS IN ACUITY AND CONTRAST SENSITIVITY." Optometry and Vision Science 72, SUPPLEMENT (December 1995): 20. http://dx.doi.org/10.1097/00006324-199512001-00015.

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Lipsky, Lior, Hanya M. Qureshi, Ronit Friling, Dan D. Gaton, Gilad Rabina, and Gad Dotan. "The effect of reduced contrast sensitivity on colour vision testing." Eye 33, no. 7 (February 19, 2019): 1068–72. http://dx.doi.org/10.1038/s41433-019-0361-y.

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WOO, GEORGE C. "Contrast Sensitivity Function as a Diagnostic Tool in Low Vision." Optometry and Vision Science 62, no. 9 (September 1985): 648–51. http://dx.doi.org/10.1097/00006324-198509000-00011.

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Leat, Susan J., and J. Margaret Woodhouse. "Reading performance with low vision aids: relationship with contrast sensitivity." Ophthalmic and Physiological Optics 13, no. 1 (January 1993): 9–16. http://dx.doi.org/10.1111/j.1475-1313.1993.tb00420.x.

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Yuan, Zhaoxu, Peter Reinach, and Jiaqin Yuan. "Contrast sensitivity and color vision with a yellow intraocular len." American Journal of Ophthalmology 138, no. 1 (July 2004): 138–40. http://dx.doi.org/10.1016/j.ajo.2004.02.024.

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Umino, Yumiko, Ying Guo, Ching-Kang Chen, Rose Pasquale, and Eduardo Solessio. "Rod Photoresponse Kinetics Limit Temporal Contrast Sensitivity in Mesopic Vision." Journal of Neuroscience 39, no. 16 (February 8, 2019): 3041–56. http://dx.doi.org/10.1523/jneurosci.1404-18.2019.

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Thibos, Larry N., David L. Still, and Arthur Bradley. "Characterization of spatial aliasing and contrast sensitivity in peripheral vision." Vision Research 36, no. 2 (January 1996): 249–58. http://dx.doi.org/10.1016/0042-6989(95)00109-d.

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Trifonov, M. I. "The Human Contrast Sensitivity Function Reflects Nonlinear Dynamics." Perception 26, no. 1_suppl (August 1997): 13. http://dx.doi.org/10.1068/v970118.

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Many processes of visual perception may be modelled by nonlinear systems. I here present a novel nonlinear analysis of contrast sensitivity data. My point of departure was the similarity in shape of (i) curves giving threshold contrast as a function of spatial modulation frequency, and (ii) the envelope of bifurcational diagrams obtained from the logistic equation. It should be noted that the well-known changes of curvature for spatial frequencies above 20 cycles deg−1 are now being discussed in the literature as a problem of the last or finest channel [Kulikowski, 1991, in Limits of Vision Eds J J Kulikowski, V Walsh, I J Murray, volume 5 of Vision and Visual Dysfunction Ed. J Cronly-Dillon (London: Macmillan) pp 286–329]. Numerical simulations of threshold contrast as a function of spatial frequency were carried out on the basis of the logistic equation appropriately adapted to the problem. Several linear transformations of the equation were used for determining the parameters that would provide the best fit to the experimental data. The model introduces the concept of perceptual cycle that can be used for characterising the dynamics of selectivity in the spatial frequency domain in its dependence on grating contrast.

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Tsui, Irena, Robert M. Beardsley, Tara A. McCannel, Scott C. Oliver, Melissa W. Chun, Steve P. Lee, Phillip E. Chow, Nzhde Agazaryan, Fei Yu, and Bradley R. Straatsma. "Visual Acuity, Contrast Sensitivity and Color Vision Three Years After Iodine-125 Brachytherapy for Choroidal and Ciliary Body Melanoma." Open Ophthalmology Journal 9, no. 1 (June 26, 2015): 131–35. http://dx.doi.org/10.2174/1874364101509010131.

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Purpose : To report visual acuity, contrast sensitivity and color vision prior to, 1 year after, 2 years after and 3 years after iodine-125 brachytherapy for choroidal and ciliary body melanoma (CCM). Design : Prospective interventional case series. Participants : Thirty-seven patients (37 eyes) with CCM. Methods : Patients had best-corrected Early Treatment Diabetic Retinopathy Study (ETDRS) visual acuity, Pelli-Robson contrast sensitivity and Hardy-Rand-Rittler color vision measurement; comprehensive ophthalmology examination; optical coherence tomography; and ultrasonography at baseline prior to, 1 year after, 2 years after and 3 years after I-125 brachytherapy. Main Outcome Measures : Visual acuity, contrast sensitivity and color vision prior to, 1 year after, 2 years after and 3 years after brachytherapy. Results : Nineteen (19) men and 18 women with mean age of 58 years (SD 13, range 30-78) prior to, 1 year after, 2 years after and 3 years after brachytherapy had mean best-corrected visual acuity of 77 letters (20/32), 65 letters (20/50), 56 letters (20/80) and 47 letters (20/125); contrast sensitivity of 30, 26, 22 and 19 letters; color vision of 26, 20, 17 and 14 test figures, respectively. Decrease in visual acuity, contrast sensitivity and color vision was statistically significant from baseline at 1 year, 2 years, and 3 years after brachytherapy. Decreased acuity at 3 years was associated with mid-choroid and macula melanoma location, ≥ 4.1 mm melanoma height, radiation maculopathy and radiation optic neuropathy. Conclusion : 1, 2 and 3 years after brachytherapy, eyes with CCM had significantly decreased visual acuity, contrast sensitivity and color vision.

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Bambo, Maria P., Blanca Ferrandez, Noemi Güerri, Isabel Fuertes, Beatriz Cameo, Vicente Polo, Jose M. Larrosa, and Elena Garcia-Martin. "Evaluation of Contrast Sensitivity, Chromatic Vision, and Reading Ability in Patients with Primary Open Angle Glaucoma." Journal of Ophthalmology 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/7074016.

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Purpose. To compare contrast sensitivity, acquired color vision deficiency, and reading ability in patients with glaucoma at different stages of the disease and to establish correlations between visual field parameters and visual function scores.Methods. This prospective cross-sectional study included 121 glaucoma patients. Subjects with a diagnosis of chronic open angle glaucoma were recruited and classified according to Hodapp-Parrish-Anderson criteria. Patients with severe visual field defects were excluded because they were older, which could bias the interpretation of visual function tests. Contrast sensitivity was measured using the Pelli-Robson Chart and the CSV1000E test. Chromatic vision was evaluated using the Farnsworth-panel D15 and the L’Anthony D15 tests of Vision Color Recorder software. Reading ability was measured using Radner-Vissum test.Results. Contrast sensitivity (with photopic and mesopic luminance with glare) differed significantly between patients with early and moderate visual field defects (p<0.05). Reading ability scores and results of the chromatic vision tests did not differ significantly between the two groups. Significant and moderate Spearman correlations between visual field indexes and contrast sensitivity tests were detected.Conclusions. Contrast sensitivity was significantly worse in patients with moderate glaucoma compared to those with early-stage glaucoma. Evaluation of visual function in clinical practice provides important information to address a glaucoma patient’s vision complaints.

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Dorr, Michael, Manuel Wille, Tiberiu Viulet, Edward Sanchez, Peter J. Bex, Zhong-Lin Lu, and Luis Lesmes. "Next-generation vision testing: the quick CSF." Current Directions in Biomedical Engineering 1, no. 1 (September 1, 2015): 131–34. http://dx.doi.org/10.1515/cdbme-2015-0034.

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AbstractThe 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. However, the current clinical standard of care typically restricts assessment to visual acuity, i.e. the smallest stimulus size that can be resolved at full contrast; alternatively, tests of contrast sensitivity are typically restricted to assessment of the lowest visible contrast for a fixed letter size. This restriction to one-dimensional subspaces of a two-dimensional space was necessary when stimuli were printed on paper charts and simple scoring rules were applied manually. More recently, however, computerized testing and electronic screens have enabled more flexible stimulus displays and more complex test algorithms. For example, the quick CSF method uses a Bayesian adaptive procedure and an information maximization criterion to select only informative stimuli; testing times to precisely estimate the whole contrast sensitivity function are reduced to 2-5 minutes. Here, we describe the implementation of the quick CSF method in a medical device. We make several usability enhancements to make it suitable for use in clinical settings. A first usability study shows excellent results, with a mean System Usability Scale score of 86.5.

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Kovalevskaya, M. A., O. A. Evdokimova, V. V. Sorokin, E. G. Kartamyshev, and A. V. Podoprigora. "Contrast sensitivity and contrast as criteria for loss of vision quality in retinal diseases." Modern technologies in ophtalmology, no. 1 (March 21, 2024): 208–14. http://dx.doi.org/10.25276/2312-4911-2024-1-208-214.

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Contrast sensitivity (CS) better correlates with subjective visual impairment and visionrelated quality of life compared with visual acuity (VA). Scleral lenses (SL) are a promising approach in the rehabilitation of patients with AMD, as they have a number of functional and cosmetic advantages. Despite the available types of SL, the search for possible modifications to improve the quality of life of patients with AMD continues. Purpose. To evaluate the effectiveness of contact correction using color filters to improve contrast sensitivity in patients with AMD. Material and methods. In the first group of patients with AMD, 64 % (218 patients, 267 eyes) were diagnosed with the dry form, 36 % (123 patients, 174 eyes) were diagnosed with neovascular AMD (nAMD), of which 87 patients (94 eyes) received anti-VEGF therapy or completed it and are under monthly monitoring without signs of MNV activity. The SpethRichman (SPARCS) and Pelly-Robson tests were performed with and without soft contact lenses ACUVUE OASYS with Transitions. Results. In group nAMD a statistically significant increase was revealed from 13.48 ± 1.56 % to 15.2 ± 2 % according to the SPAPCS test (p = 0.03) and the overall CN from 1.58 ± 0.16 to 1.75 ± 0.08 logarithmic units according to the Pelly-Robson test (p = 0.005). In the subgroup of dry AMD, there was no significant increase in CS when using contact lenses. Conclusion. Contact correction using color filters in patients with nAMD without signs of MNV activity can improve the CS in the central zone, but due to the instability of the soft lenses color filter, the study of other correction methods using color filters, such as SL. Keywords: age-related macular degeneration, contrast sensitivity, contact correction, scleral lenses

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Amin, Nida, Hina Shabbir, Nimra Fatima, Attiqa Riaz, and Sadia Siddiqui. "Investigation of Color Vision and Contrast Sensitivity Defects in Textile Industry Workers." Journal of Health and Rehabilitation Research 4, no. 1 (March 16, 2024): 1397–401. http://dx.doi.org/10.61919/jhrr.v4i1.628.

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Background: Industrial exposure to chemicals is a significant health concern, particularly within the textile industry where workers are in regular contact with potentially harmful substances. The retina, with its photoreceptor cells responsible for color vision and contrast sensitivity, is especially susceptible to damage from such exposure. Objective: This study aims to assess the impact of chemical exposure on the color vision and contrast sensitivity of workers in the Five Star Textile Industry, drawing comparisons with previous research to better understand the occupational risks and requisite protective measures. Methods: A cross-sectional, descriptive study was conducted on 100 workers with an age range of 20-50 years, examining 200 eyes. The research took place from January to June 2023, employing the Pelli-Robson chart and D-15 test for evaluating contrast sensitivity and color vision, respectively. Data were analyzed using the Pearson Chi-Square test and SPSS version 25. Results: The study found a Pearson Chi-Square value of 31.4 for color vision in the right eye and 25.7 in the left, with a significance of 0.000 for both. Contrast sensitivity tests revealed a Pearson Chi-Square value of 44.2 for both eyes, with significance remaining at 0.000, indicating a strong correlation between chemical exposure and visual impairment. Conclusion: The findings suggest a significant relationship between prolonged chemical exposure and visual function decline among textile workers, underlining the necessity for enhanced occupational health protocols and regular vision screening.

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Cakir, Mehtap, Banu Turgut Ozturk, Elif Turan, Gulsum Gonulalan, Ilker Polat, and Kemal Gunduz. "The Effect of Hypothyroidism on Color Contrast Sensitivity: A Prospective Study." European Thyroid Journal 4, no. 1 (2015): 43–47. http://dx.doi.org/10.1159/000371549.

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Background: Thyroid hormone has been shown to control retinal cone opsin expression, the protein of color vision, in adult rodents. Objectives: The aim of this study was to evaluate the effect of hypothyroidism on color contrast sensitivity in adult overt hypothyroid patients. Methods: Thirty-eight overt hypothyroid (31 females, 7 males) subjects and 20 euthyroid (16 females, 4 males) controls were studied prospectively. Color vision examination was performed by Chromatest, a software program analyzing the tritan (blue-yellow) color contrast threshold (tritan CCT) and protan (red-green) color contrast threshold (protan CCT). Color contrast sensitivity analyses of hypothyroid subjects were performed on admission and after L-thyroxine treatment when biochemical euthyroidism was achieved. Results: After a median period of 90 (90-210) days, 24 (19 females, 5 males) patients were euthyroid and eligible for a second color vision examination. Baseline tritan CCT and protan CCT values were significantly higher in the hypothyroid group compared to euthyroid controls, which clinically translates into impaired color contrast sensitivity (p < 0.001 and p < 0.001, respectively). There was a significant decrease in tritan CCT (p = 0.002) and protan CCT (p < 0.001) values in the hypothyroid group after euthyroidism was achieved, which denotes improvement in color contrast sensitivity. Conclusions: It is a novel finding of the current study that color contrast sensitivity is impaired in hypothyroidism and significantly improves after euthyroidism is achieved.

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Shrestha, Sabina, Dikchhya Sharma, Aparajita Manoranjan, Subee Joshi, and Yuliya Shrestha. "Visual Functions among amplyopic patients." Nepal Medical College Journal 25, no. 3 (October 3, 2023): 191–95. http://dx.doi.org/10.3126/nmcj.v25i3.58710.

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Apart from decreased visual acuity, amblyopia may be associated with alteration in color vision, contrast sensitivity and stereopsis. The study was conducted to assess visual functions among amblyopic patients. Cross sectional observational study was done with appropriate examination. Best corrected visual acuity, color vision, contrast sensitivity and stereopsis were done among 31 amblyopic patients of age 5-18 years, visiting Department of Ophthalmology in Kathmandu Medical College from October 2021 to March 2022. Among thirty-one patients, male is to female ratio was 1.81:1. Mean age of participants was 9.45±3.49 years. Among patients with stimulus deprivation amblyopia, visual acuity was <6/60, color vision and contrast sensitivity were decreased in 100% and moderate stereopsis (80-200 seconds of arc) was present. Among patients with strabismic amblyopia, visual acuity was decreased (6/12-6/18), color vision and contrast sensitivity were normal in 100% and good stereopsis (<60 seconds of arc) was seen. Among those with refractive amblyopia, visual acuity was 6/6-6/9 in 34.5%, 6/12-6/18 in 44.8% and 6/24-6/60 in 20.7%. Color vision was decreased in 27.3% in ametropic, 9.1% in meridional and normal in anisometropic type. Contrast sensitivity was decreased in 27.3% each in ametropic and anisometropic, and in 63.6% in meridional amblyopia. Good and poor (>200 seconds of arc) stereopsis was found in 24.1% each and moderate in 51.7% of refractive amblyopia. Contrast sensitivity was seen to be decreased with decrease in vision (40.0%, 42.8%, 50.0% and 100.0% in visual acuity 6/6-6/9, 6/12-6/18, 6/24-6/60 and<6/60 respectively). To conclude, visual functions are affected in different types of amblyopia.

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Stalin, Amritha, and Kristine Dalton. "Relationship of Contrast Sensitivity Measured Using Quick Contrast Sensitivity Function With Other Visual Functions in a Low Vision Population." Investigative Opthalmology & Visual Science 61, no. 6 (June 9, 2020): 21. http://dx.doi.org/10.1167/iovs.61.6.21.

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Tahami Babar, Rubab naqvi, Qurba Kiran, Amna Ahmed, Aneeisa Abid, and Aysha Sharif. "Effect of Amblyopia on Color Vision and Contrast Sensitivity: A Systematic Review." Journal of Health and Rehabilitation Research 4, no. 2 (June 14, 2024): 1334–41. http://dx.doi.org/10.61919/jhrr.v4i2.1147.

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Background: This systematic review aims at evaluating broader implications of amblyopia disorder for color vision and contrast sensitivity in the context of challenging the conventional approach to treatment, when visual acuity is only treated. The review will establish whether traditional and modern treatment approaches are effective in improving the above visual functions in patients. It is argued that modern treatments are more effective in ameliorating broader ranges of visual dysfunctions. Methods: For the purpose of the systematic review, a comprehensive search across such databases as PubMed, Web of Science, Scopus, ProQuest to find the studies published from 2008 to 2024 was conducted. Criteria for inclusion in the systematic review comprised of the following the review included randomized clinical trials, cohort studies, case-control studies, and cross-sectional studies if the treatment was related to the impacts on color vision and contrast sensitivity in individuals with amblyopia. The exclusion criteria included the unavailability of section on the treatment analysis. Results: The review conveys the results of studies incorporated of 43 full texts. There was substantial heterogeneity in the type of treatments and outcomes. It was found that traditional treatments, such as patching improves visual acuity, but the approach does not have a substantial effect on contrast sensitivity or color vision. On the other hand, advanced therapies overcoming these traditional deficiencies, such as perceptual learning, dichoptic training, and binocular therapy may improve contrast sensitivity by up to 40% and color vision by 30%, respectively. To conclude, modern approaches are substantially superior to traditional ones. Conclusion: The findings suggest that modern therapies offer a more comprehensive solution for ameliorating a wider range of visual dysfunctions associated with amblyopia. Keywords: Amblyopia, Color Vision, Contrast Sensitivity, Traditional Methods, Binocular Therapy.

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Suliman, IslamAltrifi Musa, and MadihaSid Ahmed Ali. "The effect of amblyopia on contrast sensitivity, color vision, and stereoacuity." Al-Basar International Journal of Ophthalmology 4, no. 2 (2017): 54. http://dx.doi.org/10.4103/bijo.bijo_5_17.

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Sally, S. L., R. Gurnsey, and F. J.A.M. "Orientation discrimination in foveal and extra-foveal vision: Measuring contrast sensitivity." Journal of Vision 2, no. 7 (March 15, 2010): 197. http://dx.doi.org/10.1167/2.7.197.

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Seo, Jae-Myoung, Ki-Young Lee, and Yong-Moo Lim. "Change of Contrast Sensitivity in Peripheral Vision Following Eccentric Viewing Training." Journal of Korean Ophthalmic Optics Society 19, no. 1 (March 31, 2014): 99–104. http://dx.doi.org/10.14479/jkoos.2014.19.1.99.

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Good, William V., Chuan Hou, and Anthony M. Norcia. "Spatial Contrast Sensitivity Vision Loss in Children with Cortical Visual Impairment." Investigative Opthalmology & Visual Science 53, no. 12 (November 19, 2012): 7730. http://dx.doi.org/10.1167/iovs.12-9775.

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Swanson, William H., and Eileen E. Birch. "Infant spatiotemporal vision: Dependence of spatial contrast sensitivity on temporal frequency." Vision Research 30, no. 7 (January 1990): 1033–48. http://dx.doi.org/10.1016/0042-6989(90)90113-y.

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Merigan, William H., and John H. R. Maunsell. "Macaque vision after magnocellular lateral geniculate lesions." Visual Neuroscience 5, no. 04 (October 1990): 347–52. http://dx.doi.org/10.1017/s0952523800000432.

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AbstractIbotenic-acid lesions of the magnocelluar portion of the macaque lateral geniculate nucleus were used to examine the role of the M-cell pathway in spatio-temporal contrast sensitivity. A lesion was place in layer 1 of the lateral geniculate of each of two monkeys. Physiological mapping in one animal demonstrated that the visual-field locus of the lesion was on the horizontal meridian, approximately 6 deg in the temporal field. Visual thresholds were tested monocularly in the contralateral eye, and fixation locus was monitored with a scleral search coil to control the retinal location of the test target.Three threshold measures were clearly disrupted by the magnocellular lesions. Contrast sensitivity for a 1 cycle/deg grating that drifted at 10 Hz was reduced from about twofold greater than, to about the same as, that for 10-Hz counterphase modulated gratings. Sensitivity for a very low spatial frequency (Gaussian blob), 10-Hz flickering stimulus was reduced so severely that no threshold could be measured. In addition, flicker resolution was greatly reduced at lower modulation depths (0.22), but not at higher depths (1.0). Two of the measured thresholds were unaffected by the lesions. Contrast sensitivity for 2 cycle/deg stationary gratings remained intact, and little or no effect on sensitivity was found for 1 cycle/deg, 10-Hz counterphase modulated gratings.Together, these results suggest that the magnocellular pathway makes little contribution to visual sensitivity at low to moderate temporal frequencies. On the other hand, some contribution to detection sensitivity is evident at lower spatial and high temporal frequencies, especially for drifting stimuli. It appears that a major role of the magnocellular pathway may be to provide input to cortical mechanisms sensitive to rapid visual motion.

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Journal articles on the topic 'Contrast sensitivity (Vision)'

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