scholarly journals Development and Validation of the Minnesota Low Vision Reading Test (MNRead) Acuity Chart for the Asante Twi Language

1970 ◽  
Vol 19 (4) ◽  
pp. 2945-2953
Author(s):  
Samuel Bert Boadi-Kusi ◽  
Michael Agyemang Kwarteng ◽  
Emmanuel Asubonteng
Keyword(s):  
Visual Acuity ◽  
Low Vision ◽  
White Background ◽  
Second Phase ◽  
Strong Correlations ◽  
Cross Sectional ◽  
Black Background ◽  
Near Visual Acuity ◽  
Development And Validation ◽  
The Relationship

Aim: To design and validate a MNREAD Asante Twi version reading chart, to aid in the assessment of near visual acuity of natives Ghanaians.Methods: Cross-sectional and experimental designs were employed in phases I and II respectively of this study. The chart was developed using 20 transited pupils in class four in the Kumasi metropolis in phase I and validated in a clinical setting at the Manhyia District Hospital, Kumasi, using students in phase II.Results: A total of 100 participants (mean age; 22.19 ± 1.61 years) were involved in the second phase of this study. A Pearson product-moment correlation coefficient was computed to assess the relationship between MNREAD Asante Twi charts logMAR scores in both eyes. The MNREAD-Asante Twi acuity charts had very strong correlations (r = 0.94, p < 0.001) for MNREAD set 1A (black on white background) scores and MNREAD set 2A (black on white background) for acuity scores. Correlation between MNREAD set 1B (white on black background) scores and MNREAD set 2B (white on black background) scores was r = 0.95, p < 0.001.Conclusion: MNREAD Asante Twi reading chart will enhance the measurement of near visual function in native Ghanaians.Keywords: Asante Twi, MNREAD, Visual Acuity, Near chart, Ghana.

scholarly journals Visual acuity in fish consumers of the Brazilian Amazon: risks and benefits from local diet

2011 ◽  
Vol 14 (12) ◽  
pp. 2236-2244 ◽  
Author(s):  
Myriam Fillion ◽  
Mélanie Lemire ◽  
Aline Philibert ◽  
Benoît Frenette ◽  
Hope Alberta Weiler ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Visual Acuity ◽  
Whole Blood ◽  
Brazilian Amazon ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Age Related ◽  
Distant Visual Acuity ◽  
Near Visual Acuity ◽  
Visual Acuity Loss

AbstractObjectiveTo examine the associations between near and distant visual acuity and biomarkers of Hg, Pb, n-3 fatty acids and Se from the local diet of fish-eating communities of the Tapajós River in the Brazilian Amazon.DesignVisuo-ocular health and biomarkers of Hg (hair, whole blood, plasma), Pb (whole blood), Se (whole blood and plasma) and n-3 fatty acids (plasma total phospholipids) were assessed in a cross-sectional study.SettingLower Tapajós River Basin (State of Pará, Brazil), May to July 2006.SubjectsTwo hundred and forty-three adults (≥15 years) without diagnosed age-related cataracts or ocular pathologies.ResultsNear visual acuity was negatively associated with hair Hg and positively associated with %DHA, with a highly significant Log Hg × age interaction term. Stratifying for age showed that while young people presented good acuity, for those aged ≥40 years, clinical presbyopia was associated with hair Hg ≥ 15 μg/g (OR = 3·93, 95 % CI 1·25, 14·18) and %DHA (OR = 0·37, 95 % CI 0·11, 1·11). A similar age-related pattern was observed for distant visual acuity in relation to blood Pb, but the evidence was weaker.ConclusionsThese findings suggest that Hg and Pb may affect visual acuity in older persons, while DHA appears to be protective for near visual acuity loss. In this population, with little access to eye care, diet may have an important influence on visuo-ocular ageing.

scholarly journals Ophthalmic Findings and Their Effect on Visual Function in Persons with Albinism in Southern Nigeria

2019 ◽  
pp. 1-8
Author(s):  
Ihunanya Ibanga ◽  
Chinyere N. Pedro-Egbe ◽  
Alfred A. Onua ◽  
Bassey Fiebai
Keyword(s):  
Visual Acuity ◽  
Contrast Sensitivity ◽  
Visual Function ◽  
Low Vision ◽  
Statistical Significance ◽  
P Value ◽  
Cross Sectional ◽  
Ocular Disorders ◽  
Southern Nigeria ◽  
Study Participants

Aim: To determine the pattern of ocular disorders in persons with albinism and how they affect visual function. Methods: This was a descriptive cross-sectional study conducted over a five-month period on persons living with albinism in Southern Nigeria. The study participants were randomly selected during the monthly meetings of a support group known as The Albinism Foundation (TAF).Visual acuity and contrast sensitivity were assessed using the ETDRS visual acuity chart and Pelli Robson contrast sensitivity test chart. A comprehensive eye examination including dilated fundoscopy was also carried out to determine other ocular disorders. Data was analyzed using SPSS version 22 and statistical significance was set at a p-value ≤ 0.05. Results: A total of 116 PWA (232 eyes) were examined. There were 44 (37.9%) males and 72 (62.1%) females. The age of the study subjects ranged from 5 to 56 years. Most eyes were visually impaired for both distance (n=228; 98.3%) and near vision (n= 224; 96.6%). Contrast sensitivity in most eyes (n=138; 59.5%) was subnormal. With refraction and Low Vision Aid (LVA), there was significant improvement of the mean VA by 2-3 acuity lines and 6 acuity lines respectively (p=0.000). All the examined eyes had fundus hypo-pigmentation, 91.4% (n=212) had iris trans-illumination, 86.2% (n=200) had nystagmus, and 34.4% (n=80) had strabismus. Nystagmus, strabismus and iris trans-illumination significantly (p=0.00) reduced visual acuity and contrast sensitivity. Conclusion: Most study participants had reduced distance visual acuity and contrast sensitivity but with correction there was a significant improvement in vision. The presence of nystagmus, strabismus and iris trans-illumination were observed to contribute to the poor vision experienced by most persons living with albinism. Hence, early optical intervention and counselling is important in improving the quality of living of persons with albinism.

scholarly journals A study of clinical and ophthalmologic profile of patients undergoing cataract surgery

2017 ◽  
Vol 5 (5) ◽  
pp. 2229
Author(s):  
Chhaya Shori ◽  
Rakesh Shori ◽  
Gannaram Laxmiprasad ◽  
Ashalatha Alli
Keyword(s):  
Developing Countries ◽  
Visual Acuity ◽  
Low Vision ◽  
Tertiary Care ◽  
Female Gender ◽  
Cross Sectional Study ◽  
Age Group ◽  
Cross Sectional ◽  
Rule Type ◽  
Department Of Ophthalmology

Background: Intraocular lens implantation is the only surgical approach available mostly in developing countries. Thus cataract constitutes as the leading cause of blindness in developing countries as many patients with cataract do not have access to hospitals and surgery. Objective was to study the clinical and ophthalmologic profile of patients undergoing cataract surgery.Methods: A hospital based cross sectional study was carried out among 100 cataract patients assigned to undergo conventional extra capsular cataract excision surgery for a period of two years in a tertiary care referral hospital. One day before the surgery these patients were admitted to the indoor wards of department of ophthalmology. From each patient, detailed history was obtained. Visual acuity was checked with Snellen’s visual acuity chart and pinhole improvement was noted.Results: Maximum prevalence was seen in the age group of 51-60 years i.e. 37% followed by 61-70 years of 30%. Thus cataract is seen more commonly in the age group of above 50 years. Prevalence of cataract was more in females (59%) as compared to 41% in males. Cortical cataract constituted 86% of total cases and remaining 14% were constituted by nuclear type of cataract. Majority of the patients i.e. 59% had visual acuity of less than 1/60 followed by 33% of having 5/60 to 1/60. 58% of the patients had against the rule type of astigmatism. 34% of the patients had with the rule type of astigmatism. Only 8% had NOA type of astigmatism.Conclusions: Increasing age and female gender were the most important risk factors in the present study. Cortical type of cataract was more common than nuclear type of cataract. Maximum had low vision.

scholarly journals VISUAL IMPAIRMENT AND ENGAGEMENT IN COGNITIVELY STIMULATING ACTIVITIES

2019 ◽  
Vol 3 (Supplement_1) ◽  
pp. S656-S656
Author(s):  
Bonnielin Swenor ◽  
beatriz Munoz ◽  
Eleanor M Simonsick
Keyword(s):  
Visual Acuity ◽  
Visual Impairment ◽  
Significant Decline ◽  
Cross Sectional ◽  
Impaired Group ◽  
Cognitive Activities ◽  
Using Data ◽  
The Relationship ◽  
Stereo Acuity ◽  
Over Time

Abstract We examined the relationship between visual impairment (VI) and engagement in cognitively stimulating activities using data from 924 participants in the Cognitive Vitality Sub-Study of the Health ABC Study. At Year 3 (baseline for these analyses), vision was assessed as: visual acuity (VA), contrast sensitivity (CS), and stereo acuity (SA). Participation in cognitively stimulating activities was determined based on responses to 12 questions (administered at Years 3, 5, 7, and 9) assessing frequency of participation ranging from none to daily. We calculated the total number of activities engaged in at least monthly. In cross-sectional analyses adjusted for age, race, and sex, impaired VA (≤20/40, 8%), CS (&lt;1.55, 5%), and SA (&lt;80 secs arc, 29%) was associated with participation in fewer cognitive activities (β=-0.54, 95% CI:-1.06, -0.03; β=-0.59, 95% CI:-0.12, 0.06; β=-0.40, 95% CI:-0.81, -0.18, respectively). Longitudinally, change per year in the number of activities differed by baseline participation levels. Those participating in ≥5 activities at baseline (population median) had a significant decline in the number of activities, irrespective of VI status. However, for those participating in &lt;5 activities at baseline, the increase in these activities tended to be lesser in the VI than in non-VI groups, and for SA this increase was significantly lower for the impaired group (βimpaired=0.004; 95% CI:-0.05, 0.05; βnot-impaired=0.06; 95% CI: 0.03, 0.10; time x SA interaction p=0.0496). These data indicate that older adults with VI participate in fewer cognitive activities and the change in participation over time differs from than those without VI.

Effects of Patterning on Flicker Frequency

1983 ◽  
Vol 27 (1) ◽  
pp. 46-50 ◽  
Author(s):  
Jack D. Grimes
Keyword(s):  
White Background ◽  
Significant Finding ◽  
Computer Terminal ◽  
Line Drawings ◽  
Spatial Image ◽  
Black Background ◽  
Luminance Difference ◽  
The Subject ◽  
The Relationship ◽  
Video Format

Flicker was studied as perceived on a raster-scan CRT-based computer terminal in a typical use environment. The subject of the research was the relationship between the perception of flicker and the kind of spatial image presented. Both traditional images (filled white disks or squares) and images consisting of text and line drawings, similar in content to typical graphic computer terminal displays, were used in the study. This study measured the flicker perception of eight people. The most significant finding from this study was that CFF thresholds for some images presented on CRT displays in a typical use setting, differed significantly from more traditional images used in most CFF studies reported in the literature. For the eight images tested, the two which exhibited significantly higher CFF thresholds were lines or text on a black background (patterns 3 and 4). Therefore, an important factor to be considered in the prediction of the flicker characteristics of a 60 Hertz, noninterlaced CRT display in conditions similar to those of this study is the choice of normal video (black background) or reverse video format. The white background video format is likely to flicker when the display luminance is above 20 ft-L while the black background video format threshold was about 80 ft-L for both patterns 3 and 4. Alternatively, this luminance difference corresponds to about a 10 Hertz shift in CFF. In this study, the choice of video format alone, resulted in a luminance difference of 60 ft-L at CFF, or alternatively, resulted in a 10 Hertz shift in CFF at a particular luminance, for images normally found on actual CRT displays.

scholarly journals The Prevalence of Visual Acuity Impairment among School Children at Arada Subcity Primary Schools in Addis Ababa, Ethiopia

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Haile Fentahun Darge ◽  
Getahun Shibru ◽  
Abiy Mulugeta ◽  
Yinebeb Mezgebu Dagnachew
Keyword(s):  
Visual Acuity ◽  
Visual Impairment ◽  
School Children ◽  
Primary Schools ◽  
Low Vision ◽  
Addis Ababa ◽  
Care Service ◽  
Health Care Service ◽  
Cross Sectional Study ◽  
Cross Sectional

Background. Visual impairment and blindness are major public health problems in developing countries where there is no enough health-care service. Objective. To determine the prevalence of visual impairment among school children. Materials and Methods. A school-based cross-sectional study was conducted between 15 June 2015 and 30 November 2015 at Arada subcity primary schools, Addis Ababa, Ethiopia. Two schools were selected randomly, and 378 students were screened from grades 1 to 8 using systematic random sampling method. Snellen chart was used for visual acuity test. Students who had visual acuity of ≤6/12 were further examined by an ophthalmologist to diagnose the reason for low vision. Data was analyzed using SPSS version 20. Results. A total of 378 students were screened, and 192 (50.8%) were females and the remaining 186 (49.2%) were males. The prevalence of visual impairment (VA) of ≤6/12 on either eye was 5.8%, VA < 6/18 on either eye was 1.1%, and VA < 6/18 on the better eye was 0.53%. In this study, color blindness [OR: 19.65, 95% CI (6.01–64.33)] was significantly associated with visual acuity impairment. Conclusion. The prevalence of visual impairment among school children in the study area was 5.8% and school screening is recommended.

scholarly journals Hypertension Relationship with The Incidence of Cataract in The Elderly in The Eye of dr. M. Yunus Bengkulu Hospital

2018 ◽  
Vol 6 (2) ◽  
pp. 43-48
Author(s):  
Ida Rahmawati ◽  
Loren Juksen ◽  
Jopi Ishan Putra
Keyword(s):  
Low Vision ◽  
Statistical Tests ◽  
Sampling Technique ◽  
The Elderly ◽  
Systematic Sampling ◽  
Eye Care ◽  
Chi Square ◽  
Cross Sectional ◽  
Chi Square Analysis ◽  
The Relationship

Cataract is eye disease which can cause low vision and blindness. Blindness cases are highest in Indonesia and in the World due to cataract. Cataract could be happened because of degenerative factors that can be influenced by aging. Hypertension is either degenerative disease due to free radicals and decrease in antioxidant so that, can increase of lens opacity.This research aims to know the relationship between hypertension on elderly in Outpatient Eye Care Dr. M Yunus Hospital, Bengkulu Province, years 2018. This technic research used cross sectional. The subject in this research is all of elderly with cataract who getting  treatment in Outpatient Eye Care Dr. M. Yunus Bengkulu. The sampling technique uses proportional systematic sampling, obtained 90 respondents. Statistical tests using chi-square (X2). To determine the closeness of the relationship using Contingency Coefficient (C). The result of this research obtained; a) there were 29 respondents (32.2%) with hypertension and 61 respondents or 67.8% without hypertension; b) there were 27 respondents (30.0%) with mature cataract and 63 respondents or 70.0% with immature cataract. The result of Chi Square Analysis obtained p= 0.279 < α = 0.05 meaning there is no relationship between hypertention and cataract

scholarly journals Refraction and Low Vision Rehabilitation in Patients with Oculocutaneous Albinism

2020 ◽  
Vol 36 (2) ◽  
Author(s):  
Deniz Altınbay
Keyword(s):  
Visual Acuity ◽  
Observational Study ◽  
Low Vision ◽  
Oculocutaneous Albinism ◽  
Refractive Errors ◽  
Low Vision Aids ◽  
Low Vision Rehabilitation ◽  
Near Visual Acuity ◽  
Vision Rehabilitation ◽  
High Degree

Purpose:  To evaluate the types of refractive errors and compliance of patients of Oculocutaneous Albinism (OCA) to low vision aids. Study Design:  Descriptive observational study. Place and Duration of Study:  Provincial Directorate of Health, Adana City Education and Research Hospital, from 2010 to 2018. Material and Methods:  Seven hundred and fifteen patients attended the hospital between 2010 and 2018 with the complaint of low vision and 31 patients with OCA were included in this study by convenient sampling. Best corrected distance and near visual acuity (VA) was measured along with the complete ocular examination. Patients were classified according to low vision and refraction degrees. High degree near eyeglasses, Galilean and Keplerian telescopes, magnifiers and special filter glasses were used as low vision aids (LVA). Results:  Mean age was 16.45 ± 12.72 years. On admission, mean distance VA was 0.12 ± 0.07 [mean log MAR 0.9], near VA was 1.48M ± 0.74M, astigmatism was 4.02 ± 1.45 diopters (D), and spherical equivalents were 1.54 ± 4.96 D. Hypermetropia was seen more frequently than myopia. Twenty-seven (87%) patients were prescribed telescopes for distance. Near visual acuity increased from 1.4M ± 0.7M to 0.9M ± 0.4M after rehabilitation. There was an increase in distance visual acuity in all patients (p < 0.001). Seventeen (63%) patients bought the telescope, and 15 (55%) patients used the device. The most preferred special filter glasses were 450nm (39%) and 540 nm (25%). Conclusion:  Astigmatism in oculocutaneous albinism was with the rule and the most commonly detected refractive error was hypermetropia. Patients are non-compliant in buying telescopes in which case tablet and computers with special applications for low vision can be better options.

scholarly journals AS-OCT application in quantifying Posterior capsule opacification severity with varied IOL designs

2020 ◽  
Author(s):  
SHASHA YU ◽  
Chengzhe Lu ◽  
Yawen Guo ◽  
Yun Zhao ◽  
Xiaoyong Yuan
Keyword(s):  
Visual Acuity ◽  
Axial Length ◽  
Visual Function ◽  
Anterior Segment ◽  
Posterior Capsule Opacification ◽  
Posterior Capsule ◽  
Severity Assessment ◽  
Cross Sectional ◽  
Function Impairment ◽  
The Relationship

Abstract Background To evaluate application of AS-OCT in PCO severity assessment and analyse relationship between PCO severity and IOL characters. Methods PCO patients were prospectively recruited. Cross-sectional images of the anterior segment at horizontal and vertical medians were acquired with AS-OCT. The area of the IOL-PC (posterior capsular) space and PCO severity (area, thickness and density at 3 mm and 5 mm IOL optic regions) were measured. The relationship between visual acuity and PCO severity, comparisons of PCO severity and IOL-PC space using varied IOL designs were analysed. Results One hundred PCO eyes were enrolled. IOL-PC space and PCO thickness and area was positively correlated with axial length. The cut-off level of visual acuity: was 0.52 Log MAR. Visual acuity were positively correlated with PCO area and thickness when visual acuity was ≤ 0.52 Log MAR. 3-piece C haptic IOL showed a smaller PCO area and thickness than the 1-piece 3 haptic IOL and 1-piece 4 haptic IOL. PCO area and thickness values for an IOL with a diameter ≤ 11.0 mm were greater than for an IOL with a diameter of 12.5 mm. The differences were statistically significant. PCO area and thickness increased when IOL haptic angulation increased (from 0 to 12 degrees). Conclusions In PCO eyes, cut-off level of visual acuity was 0.52 Log MAR. With more severe PCO, visual acuity maybe not enough to describe the visual function impairment. PCO severity and IOL-PC space was significantly correlated with axial length and IOL design and material.

scholarly journals Anterior segment OCT application in quantifying posterior capsule opacification severity with varied intraocular lens designs

2021 ◽  
Vol 14 (9) ◽  
pp. 1384-1391
Author(s):  
Sha-Sha Yu ◽  
◽  
Ya-Wen Guo ◽  
Yun Zhao ◽  
Xiao-Yong Yuan ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Intraocular Lens ◽  
Axial Length ◽  
Anterior Segment ◽  
Posterior Capsule Opacification ◽  
Posterior Capsule ◽  
Severity Assessment ◽  
Cross Sectional ◽  
Function Impairment ◽  
The Relationship

AIM: To evaluate the application of anterior segment-optical coherence tomography (AS-OCT) in posterior capsule opacification (PCO) severity assessment and analyse the relationship between PCO severity and intraocular lens (IOL) characters. METHODS: PCO patients were prospectively recruited. Cross-sectional images of the anterior segment at horizontal and vertical meridians were acquired with AS-OCT. The area of the IOL-PC (posterior capsular) space and PCO severity (area, thickness, and density at 3 mm and 5 mm IOL optic regions) were measured. The relationship between PCO severity and visual acuity, comparisons of PCO severity and IOL-PC space using varied IOL designs were analysed. RESULTS: One hundred PCO eyes were enrolled. IOL-PC space, PCO thickness and area were positively correlated with axial length. In addition, PCO area and thickness were positively correlated with visual acuity when it was ≤0.52 logMAR. The cut-off level of visual acuity should be 0.52 logMAR. With varied IOL designs, 3-piece C haptic IOL showed a smaller PCO area and thickness than the 1-piece 3 haptic IOL and 1-piece 4 haptic IOL. PCO area and thickness values for an IOL with a diameter ≤11.0 mm was greater than for an IOL with a diameter of 12.5 mm, and the differences were statistically significant. PCO area and thickness increased when IOL haptic angulation increased (from 0 to 12 degrees). CONCLUSION: In PCO eyes, cut-off level of visual acuity is 0.52 logMAR. With more severe PCO, visual acuity maybe not enough to describe the visual function impairment. PCO severity and IOL-PC space are significantly correlated with axial length and IOL design and material.

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