Effect of cataract surgery on contrast sensitivity and glare in patients with 20/50 or better Snellen acuity (original) (raw)
Related papers
Glare disability and contrast sensitivity before and after cataract surgery
Journal of Cataract & Refractive Surgery, 1997
To determine whether brightness-induced glare decreases spatial contrast sensitivity and visual acuity in preoperative cataract patients with functional visual complaints and to compare preoperative with postoperative results. Sir Mortimer B. Davis Jewish General Hospital, Montreal, Quebec, Canada. Twenty patients with a visual acuity of 20/70 or better at the time of chart selection and no other ocular pathology who were referred for cataract surgery were evaluated with the Optec 3000 vision tester to assess contrast sensitivity and visual acuity in the presence and absence of glare. Testing was done preoperatively and 1 and 3 months postoperatively. An analysis of variance indicated that there were statistically significant double interactions between the preoperative/postoperative and glare/no-glare variables and between the preoperative/postoperative and spatial frequency variables. Postoperatively, visual acuity and contrast sensitivity improved to within normal limits. There were no statistically significant differences in visual acuity and spatial contrast sensitivity between 1 and 3 months postoperatively. Spatial contrast sensitivity and glare testing provided objective assessment of patients who had good visual acuity yet also had functional complaints.
Glare measurements before and after cataract surgery
Acta Ophthalmologica, 2009
The efficacy of cataract surgery in improving visual performance was evaluated in 10 patients by measuring changes in intraocular light scatter, contrast sensitivity and glare induced visual loss. Two different methods were used to estimate these functions before and after cataract extraction with implantation of a monofocal posterior intraocular lens. By one method intraocular light scattering was assessed. By the other, letter contrast sensitivity and glare induced visual loss were determined. Preoperatively most patients had various glare problems, glare induced visual loss and increased intraocular light scatter. Following surgery the letter contrast sensitivity increased by a factor of 3 or more (mean 4.3). The glare problems diminished or disappeared after surgery, although several patients still had increased intraocular light scattering and glare induced visual loss compared to normals. Postoperatively the contrast sensitivity both with and without glare had increased to a level where the glare induced visual loss did not create any visual problems.
Revista Mexicana de Oftalmología (English Edition), 2020
Objective: To determine the effect of cataract surgery on contrast sensitivity and quality of life of patients with different types of cataract. Methods: Prospective study with a preand post-test design in patients with indication for cataract surgery by phacoemulsification. Best-corrected visual acuity (BCVA) at different contrast levels and vision-related quality of life (V-RQOL) were evaluated before and 30 days after surgery. The study population was divided into 3 comparative groups according to the type of predominant cataract following the Lens Opacities Classification System III: nuclear, cortical and posterior subcapsular (PSC). Results: Seventy-eight eyes of 78 patients with a mean age of 69.3 ± 9.6 (51-86) years were included. In the preoperative period, low contrast sensitivity was slightly affected in the nuclear group and severely affected in the PSC group. V-RQOL limitations scale was significantly lower for the PSC group compared to the nuclear group (0 [0-15.6 vs. 6.2 [0-12.5; p = 0.040). After surgery, BCVA and contrast sensitivity improved in the three study groups. The most significant changes were observed in the PSC group. V-RQOL improvement was positively related to visual acuity gain in high and low contrast in the three study groups. Conclusion: Cataract surgery significantly improved contrast sensitivity and quality of life of all patients, especially in those with PSC opacity.
Ophthalmologica, 2011
Aims: To evaluate straylight and contrast sensitivity in cataractous eyes of different morphologies, and to determine which type of cataract presents higher impairment of visual function, specifically compared to studies proposing new norms for European drivers. Methods: Best-corrected visual acuity (BCVA), contrast sensitivity and straylight were measured in 97 cataractous eyes using respectively a Snellen chart, a Pelli-Robson chart and the compensation comparison method (C-Quant Straylight Meter). Cataracts were graded using the Lens Opacities Classification System III (LOCS III) and divided into 4 groups: nuclear, cortical, nuclear-cortical and posterior subcapsular cataract. These results were compared to data from 38 cataract-free control subjects. Results: Contrast sensitivity was reduced and straylight increased in all cataract patients, most notably in posterior subcapsular and nuclear-cortical cataract. Contrast sensitivity and BCVA were correlated (r = 0.44), whereas stra...
Effect of cataract type and severity on visual acuity and contrast sensitivity
Journal of ophthalmic & vision research, 2011
To determine the effect of cataract type and severity in eyes with pure types of age-related lens opacities on visual acuity (VA) and contrast sensitivity in the presence and absence of glare conditions. Sixty patients with senile cataracts aged 40 years or older with no other ocular pathologies were evaluated for VA and contrast sensitivity with and without glare. Lens opacities were classified according to the Lens Opacities Classification System (LOCS) III. VA was measured using the Snellen chart. Contrast sensitivity was measured with the Vector Vision CSV-1000E chart in the presence and absence of glare by calculating the area under log contrast sensitivity (log CS) function (AULCSF). Cataracts were posterior subcapsular in 26 eyes, cortical in 19 eyes and nuclear in 15 eyes. VA significantly decreased with increasing cataract severity and there was significant loss of contrast sensitivity at all spatial frequencies with increasing cataract severity. AULCSF significantly decrea...
Contrast sensitivity and glare in cataract using the Pelli-Robson chart
British Journal of Ophthalmology, 1992
There is a need for a convenient, clinically applicable test of glare disability which can be used in the preoperative evaluation of patients with cataract. In this study, contrast sensitivity (using the Pelli-Robson letter chart), near vision, and visual acuity were compared, with and without the introduction of a glare source in 70 patients with cataract, 15 with intraocular lenses, and 19 controls. A disposable pen torch was shone at the pupillary margin to induce glare. Contrast sensitivity demonstrated the most marked reduction during glare testing. Cortical cataracts were most affected followed by posterior subcapsular opacities. The glare disability was significantly less in pseudophakic patients and was absent from patients with non-cataractous phakic eyes. Glare testing with a disposable pen torch and a Pelli-Robson contrast sensitivity letter chart provides a rapid test of glare disability which can be easily incorporated into the clinical appraisal of patients with cataract.
Investigative Ophthalmology & Visual Science, 2006
To evaluate the relationship between contrast acuity at declining contrast levels and the type and density of lens opacity in cataract. METHODS. Contrast acuity at declining contrast levels was determined with the Holladay Contrast Acuity Test, in relation to the type and density of age-related cataract in 180 patients with bilateral cataract and 20 control subjects with normal macular function. Cataracts were graded according to the Lens Opacities Classification System (LOCS) III of nuclear color (NC), nuclear opalescence (NO), cortical (C), and posterior subcapsular (P) cataract. Best-corrected visual acuity and near contrast acuity were determined in randomized order monocularly in both eyes. Visual difficulties in everyday life were evaluated, using the VF-14 questionnaire and the Cataract Symptom Score. RESULTS. The contrast-dependent effect of cataract on contrast acuity was statistically significant (P Ͻ 0.001; two-way ANOVA). In the comparison of early, intermediate, and advanced nuclear, nuclear-cortical, and posterior subcapsular cataracts (PSCs), significantly reduced contrast acuity scores were found for the PSC groups (P Ͻ 0.001). Comparison of nuclear and nuclear-cortical cataracts showed the contrast acuity scores to be comparable at all contrast levels (P Ͼ 0.05). High correlation coefficients were found between the LOCS III P score and the contrast acuity measurements (r ϭ 0.77-0.84; P Ͻ 0.001). In contrast, the correlation coefficients of the NO, NC, and C scores were considerably lower (r ϭ 0.45-0.66; P Ͻ 0.001). High correlation coefficients were also found between the contrast acuity measurements and self-reported functional vision. CONCLUSIONS. The statistically significant, contrast-dependent effect of cataract on contrast acuity supports the clinical relevance of recording visual acuity at low contrast levels in patients with age-related cataract. Particularly, the severity of PSC has a strong influence on the impairment of contrast acuity. Contrast acuity corresponded closely to the self-reported visual difficulties in everyday life. (Invest Ophthalmol Vis Sci. 2006; 47:5412-5422) , according to the tenets of the Declaration of Helsinki. One-hundred-eighty patients with bilateral cataract and 20 normalsighted control subjects (mean age Ϯ SD: 66.9 Ϯ 9.2 years; 400 eyes) were included in the study. Exclusion criteria were a history of ocular disease, intraocular surgery, laser treatment, glaucoma, diabetic retinopathy, amblyopia, and age-related macular degeneration. In the control group, only participants without ocular disease and full VA (logMAR 0.0 or better) were included.
Cornea, 2000
Purpose. To determine whether visual acuity (VA) measurements performed at low levels of contrast and glare are a better diagnostic tool for determining whether corneal clouding warrants surgery. Methods. Fifty-nine subjects were recruited from among the candidates for corneal graft. Monocular VA was measured with three Regan contrast VA charts: 96, 25, and 11%, with and without glare provided by the Brightness Acuity Tester (BAT). The discriminative ability of the tests was estimated using the area (A R) under receiver operating characteristic (ROC) curves. Associations between the different VA tests and the Visual Function Index (VF-14) score were studied, using Spearman coefficients. Results. When comparing candidate eyes with contralateral eyes with corneal disease, lower contrasts VA tests provided greater discriminative power. VA measurements made with glare also tended to provide greater discrimination. In fact, discrimination was best with 11% contrast VA with glare, but "testability" was poor. The most practical test in a clinical setting, which retained high discriminative ability (0.798), was the 25% contrast VA with glare. The eye with the best VA correlated strongly with the VF-14, especially at 25% contrast without glare, resulting in an R s of −0.729. Conclusion. Twenty-five percent contrast VA with BAT could help the practitioner to decide whether a corneal transplant is warranted when symptoms of reduced vision are more important than what high-contrast VA might indicate.
Contrast sensitivity function after cataract extraction and intraocular lens implantation
Documenta Ophthalmologica, 1996
Divergent contrast sensitivity findings have been reported in patients with intraocular lens implants. The purpose of this study was to determine contrast thresholds of patients with good visual acuity after uncomplicated cataract extraction and posterior chamber conventional IOL implantation. Fifty-two eyes of fifty two patients, who had undergone uncomplicated extracapsular cataract extraction and posterior chamber intraocular lens implantation together with 48 eyes of 48 control subjects were tested for contrast sensitivity function. All of the patients had best corrected visual acuity 0.8 (20/25) or better, on the Snellen scale. Patients with concomitant eye disease were excluded. Contrast sensitivity was measured using stationary sine-wave gratings of four spatial frequencies (3.0 to 18.0 cycles/degree), at the testing distance of 8 feet. A loss of contrast sensitivity was found in patients with intraocular lens implants, compared with control subjects of similar age, sex and visual acuity. The loss was statistically significant at intermediate (6 cyc/deg) and high spatial frequencies (12.0 and 18.0 cycles/degree), while it was not statistically significant at low spatial frequencies (3 cyc/deg). This may be the reason ofnonspecific visual complaints ('washed-out images'), despite normal Snellen acuity, after cataract surgery and monofocal IOL implantation.