scholarly journals Refractive errors and visual impairment among children and adolescents in southernmost China

2021 ◽  
Author(s):  
Li Peng ◽  
Ling Gao ◽  
Yunyan Zheng ◽  
Yanan Dai ◽  
Qing Xie
Keyword(s):  
Visual Impairment ◽  
High Myopia ◽  
Large Population ◽  
Population Based ◽  
Cross Sectional Study ◽  
Ultraviolet B ◽  
Refractive Errors ◽  
Uvb Radiation ◽  
Cross Sectional ◽  
Daylight Exposure

Abstract Background: Refractive errors and visual impairment in southernmost China have not been reported previously. We aim to investigate and determine the age-specific prevalence of myopia, hyperopia, astigmatism, and visual impairment based on a large population cross-sectional study in Hainan area of southernmost tropical province in China. Methods: A population-based sample of 31,524 children aged 6-15 years from Hainan was assessed. Non-cycloplegic autorefraction and visual acuity (VA) analyses were performed on all participants and a subgroup of participants undergoing cycloplegia. Results: Of all participators, 22.986% presented uncorrected VA (UCVA) decreased worse than 0.3logMAR, 17.206% presented UCVA decreased worse than 0.5logMAR and 46.95% presented abnormal UCVA [worse than 0.1logMAR (≥6, <8 years old) and worse than 0logMAR(≥8years and older)] at least in one eye. The overall prevalence of myopia [spherical equivalent (SE) ≤−0.50 D] and high myopia (SE≤−6.00 D) were 45.97%, 0.96% respectively. Hyperopia [SE ≥+1.00 D (≥7 years old) and SE ≥+2.00 D (≥6, <7 years old)] and significant hyperopia (SE≥+3.00 D) were 4.21% and 0.62%, respectively. Astigmatism [cylinder≥1.00 D (≥7 years old) and ≥+1.75 D (≥6, <7 years old)] was found in 31.87%. Conclusions: Myopia was the most common refractive error in southernmost province in China (Hainan). Its prevalence increased with age, while hyperopia prevalence showed a decreasing trend. However, myopia, especially high myopia prevalence was much lower than in other urban regions across China, as residents of Hainan may benefit from more ultraviolet B (UVB) radiation during daylight exposure.

scholarly journals Refractive errors and visual impairment among children and adolescents in southernmost China

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Li Peng ◽  
Ling Gao ◽  
Yunyan Zheng ◽  
Yanan Dai ◽  
Qing Xie
Keyword(s):  
Visual Acuity ◽  
Visual Impairment ◽  
High Myopia ◽  
Large Population ◽  
Population Based ◽  
Cross Sectional Study ◽  
Refractive Errors ◽  
Spherical Equivalent ◽  
Sectional Study ◽  
Cross Sectional

Abstract Background Refractive errors and visual impairment in southernmost China have not been reported previously. We aim to investigate and determine the age-specific prevalence of myopia, hyperopia, astigmatism, and visual impairment based on a large population cross-sectional study in Hainan area of southernmost tropical province in China. Methods A population-based sample of 31,524 children aged 6–15 years from Hainan was assessed. Non-cycloplegic autorefraction and visual acuity (VA) analyses were performed on all participants and a subgroup of participants undergoing cycloplegia. Results Of all participants, 23.0% presented uncorrected VA (UCVA) was worse than 20/40 in worse eye, 6.0% presented mild presenting visual acuity impairment (PVAI), 7.0% presented moderate PVAI, 0.2% presented severe PVAI in the better eye, and 46.9% presented abnormal UCVA [worse than 20/25 (≥ 6, < 8 years old) and worse than 20/20 (≥ 8 years and older)] at least in one eye. The overall prevalence of myopia [spherical equivalent (SE) ≤  − 0.50 D] and high myopia (SE ≤  − 6.00 D) were 46.0%, 1.0% respectively. Hyperopia [SE ≥  + 1.00 D (≥ 7 years old) and SE ≥  + 2.00 D (≥ 6, < 7 years old)] and significant hyperopia (SE ≥  + 3.00 D) were 4.2 and 0.6%, respectively. Astigmatism [cylinder ≥ 1.00 D (≥ 7 years old) and ≥ 1.75 D (≥ 6, < 7 years old)] was found in 31.9%. Conclusions Myopia was the most common refractive error in southernmost province in China (Hainan). Its prevalence increased with age, while hyperopia prevalence showed a decreasing trend. However, myopia, especially high myopia prevalence was much lower than in other urban regions across China.

scholarly journals Visual impairment and blindness in the Xingu Indigenous Park – Brazil

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Arthur Gustavo Fernandes ◽  
Monica Alves ◽  
Roberta Andrade e Nascimento ◽  
Natalia Yumi Valdrighi ◽  
Rafael Cunha de Almeida ◽  
...  
Keyword(s):  
Visual Impairment ◽  
Minority Groups ◽  
Large Population ◽  
Population Sample ◽  
Cross Sectional Study ◽  
Indigenous Populations ◽  
Refractive Errors ◽  
Cross Sectional ◽  
Corrected Visual Acuity ◽  
Large Population Sample

Abstract Background Most estimates of visual impairment and blindness worldwide do not include data from specific minority groups as indigenous populations. We aimed to evaluate frequencies and causes of visual impairment and blindness in a large population sample from the Xingu Indigenous Park. Methods Cross-sectional study performed at Xingu Indigenous Park, Brazil, from 2016 to 2017. Residents from 16 selected villages were invited to participate and underwent a detailed ocular examination, including uncorrected (UVA) and best-corrected visual acuity (BCVA). The main cause of UVA < 20/32 per eye was determined. Results A total of 2,099 individuals were evaluated. Overall, the frequency of visual impairment and blindness was 10.00% (95% CI: 8.72–11.29%) when considering UVA, decreasing to 7.15% (95% CI: 6.04–8.25%) when considering BCVA. For each increasing year on age, the risk  of being in the visually impaired or blind category increased by 9% (p < 0.001). Cataracts (39.1%) and uncorrected refractive errors (29.1%) were the most frequent causes of visual impairment and blindness in this population. The main causes among those aged 45 years and more were cataracts (54.5%) while refractive errors were the main cause in adults aged 18 to 45 years (50.0%) and children up to 18 years old (37.1%). Conclusions A higher frequency of visual impairment and blindness was observed in the indigenous population when compared to worldwide estimates with most of the causes being preventable and/or treatable. Blindness prevention programs should focus on accessibility to eye exam, cataract surgeries and eyeglass distribution.

scholarly journals Socio-Economic Status and Prevalence of Self-Reported Osteoporosis in Tehran: Results from a Large Population-Based Cross-Sectional Study (Urban HEART-2)

2018 ◽  
Vol 95 (5) ◽  
pp. 682-690 ◽  
Author(s):  
M. Asadi-Lari ◽  
Y. Salimi ◽  
M. R. Vaez-Mahdavi ◽  
S. Faghihzadeh ◽  
A. A. Haeri Mehrizi ◽  
...  
Keyword(s):  
Economic Status ◽  
Large Population ◽  
Population Based ◽  
Cross Sectional Study ◽  
Sectional Study ◽  
Cross Sectional ◽  
Socio Economic Status

scholarly journals Multimorbidity as an important issue among women: results of a gender difference investigation in a large population-based cross-sectional study in West Asia

BMJ Open ◽  
2017 ◽  
Vol 7 (5) ◽  
pp. e013548 ◽  
Author(s):  
Masoomeh Alimohammadian ◽  
Azam Majidi ◽  
Mehdi Yaseri ◽  
Batoul Ahmadi ◽  
Farhad Islami ◽  
...  
Keyword(s):  
Gender Difference ◽  
Large Population ◽  
Population Based ◽  
Cross Sectional Study ◽  
Sectional Study ◽  
Cross Sectional

The prevalence and causes of visual impairment in Dariyah, a rural community in Saudi Arabia

2021 ◽  
Vol 80 (1) ◽  
Author(s):  
Waleed Alghamdi ◽  
Godwin O. Ovenseri-Ogbomo
Keyword(s):  
Saudi Arabia ◽  
Visual Impairment ◽  
Rural Community ◽  
Refractive Error ◽  
Population Based ◽  
Vision Impairment ◽  
Health Examination ◽  
Refractive Errors ◽  
Cross Sectional ◽  
Eye Examination

Background: Visual impairment is disproportionately distributed between rural and urban dwellers. Rural dwellers have limited access to the eye care services that are available in urban cities.Aim: The aim of this study was to determine the prevalence and causes of visual impairment in Dariyah, a rural community in the Qassim region, Saudi Arabia.Setting: This research comprised a population-based assessment of the vision and visual status of the inhabitants of Dariyah community.Methods: A cross-sectional descriptive study was conducted amongst the inhabitants of the community of Dariyah. A comprehensive eye examination consisting of visual acuity, ocular health examination, objective and subjective refraction was performed. The examinations were conducted by registered ophthalmologists and optometrists from the Qassim University. Vision impairments were categorised according to the International Classification of Diseases (ICD), Section 9D90, ‘Vision impairment including blindness’ (2018).Results: In all, 68 (24.5%) participants had vision impairment (using the better-seeing eye), with refractive errors being the main cause of vision impairment. Other causes of vision impairment included cataract (20, 7.2%), trichiasis (5, 1.8%) and glaucoma (2, 0.7%). Refractive errors were present in 193 (69.7%), with astigmatism being the commonest refractive error. About 60% of those with refractive errors presented without spectacles for correction, and 20% reported that they had never had an eye examination. Refractive errors could not be determined in 19 (6.9%) of the subjects because of conditions such as matured cataract and other ocular abnormalities.Conclusion: Uncorrected refractive error was found to be the leading cause of vision impairment in this rural community in Saudi Arabia.

Daytime napping is associated with retinal microcirculation: a large population-based study in China

SLEEP ◽  
2021 ◽  
Author(s):  
Xin Liu ◽  
Guowei Wang ◽  
Xiaoyan Wang ◽  
Yueye Wang ◽  
Yan Min ◽  
...  
Keyword(s):  
Confidence Interval ◽  
Large Population ◽  
Vascular Diseases ◽  
Population Based ◽  
Cross Sectional Study ◽  
Cubic Spline ◽  
Fundus Photography ◽  
Cross Sectional ◽  
Retinal Microcirculation ◽  
Cubic Spline Curve

Abstract Study Objectives To investigate the association between daytime napping and retinal microcirculation. Methods This is a cross-sectional study from a prospective population-based cohort. 2,662 participants were recruited after quota sampling. Information on napping was collected through face-to-face interviews. Retinal vascular calibers (RVCs), including central retinal arteriolar equivalent (CRAE), central retinal venular equivalent (CRVE), and arterio-to-venous ratio (AVR), were obtained from fundus photography. Multivariate regression and restricted cubic spline curve were performed to determine the association between RVCs and daytime napping duration. Results 56.4% participants reported daytime napping regularly. Compared to no nap, daytime nap was related to higher CRAE, with nap duration of 0.5–1 h showing the most significant association. 0.5–1 h daytime nappers displayed an average of 4.18 µm (95% confidence interval [CI] 2.45–5.91, p &lt; 0.001) wider CRAE than non-nappers after adjustment. No significant association was found between CRVE and daytime napping. Moreover, individuals with 0.5–1 h daytime napping had a lower risk for AVR reduction (odds ratio [OR] 0.70, 95% confidence interval [CI] 0.56–0.86, p = 0.001) than non-nappers. Similar association persisted in non-hypertensive population. Restricted cubic spline indicated a J-shaped relationship between AVR reduction and nap duration. Conclusion Retinal microcirculation was positively associated with self-reported 0.5–1 h daytime napping. Better indicators of retinal microcirculation were probably related to nap duration in a J-shaped manner. Also, the possibly beneficial role of 0.5–1 h daytime napping on retinal microcirculation might be independent of clinically diagnosed vascular diseases.

scholarly journals Refractive Errors and its Associated Factors among Undergraduate Medical Students in Kathmandu

2019 ◽  
Vol 21 (1) ◽  
pp. 26-30
Author(s):  
Aparna Rizyal ◽  
JS Sunrait ◽  
A Mishal
Keyword(s):  
Medical Students ◽  
Visual Impairment ◽  
Refractive Error ◽  
Single Point ◽  
Cross Sectional Study ◽  
Refractive Errors ◽  
Undergraduate Medical Students ◽  
Cross Sectional ◽  
Parental History ◽  
Medical College

 Refractive error is a defect in the optical system of the eye which prevents light from being brought to a single point focus on the retina, thus reducing normal vision. This optical defect is the second most common cause of visual impairment globally as well in Nepal. At present, there are 285 million visually impaired people in the world. An estimated 4 out of 5 visual impairment (80%) can be prevented or cured, uncorrected refractive errors are the leading cause (42%) followed by cataract (33%). A descriptive cross sectional study was conducted to determine the proportion of undergraduate medical students with refractive errors in Nepal Medical College, and to identify factors associated with it. A total of 210 medical students volunteered for this study, with 100 males (47.6%) and 110 females (52.4%). The age of these students were between 18 to 26 years, with an average of 20.5 years. The proportion of medical students with refractive error was slightly more than half (51.4%), with simple myopia being the leading type (42.9%), followed by astigmatism (7.1%) and simple hypermetropia (1.4%). Parental history of refractive error was observed to be significantly associated with that of the medical students. There was also a significant association between refractive error and the daily use of mobile phones and laptops. However, years spent in medical education were not observed to be significant.

scholarly journals Prevalence and service assessment of cataract in Tibetan areas of Sichuan Province, China: population-based study

BMJ Open ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. e031337 ◽  
Author(s):  
Danba Jiachu ◽  
Ling Jin ◽  
Feng Jiang ◽  
Li Luo ◽  
Hong Zheng ◽  
...  
Keyword(s):  
Visual Impairment ◽  
Response Rate ◽  
Rapid Assessment ◽  
Population Based ◽  
Cross Sectional Study ◽  
Secondary Outcome ◽  
Cross Sectional ◽  
Population Based Study ◽  
Low Prevalence ◽  
Better Than

ObjectivesTo assess the prevalence of visual impairment (VI) and blindness (BL) due to cataract and cataract surgical outcomes in remote dispersed and high-altitude Tibetan areas of China.Design and settingA cross-sectional study was conducted among people aged 50 and above in Tibetan Autonomous Prefecture of Kandze (TAPK), China, in 2017. The Rapid Assessment of Avoidable Blindness protocol was followed.ParticipantsOf 5000 eligible participants, 4764 were examined (response rate 95.3%).Primary and secondary outcome measuresCataract VI was defined as lens opacity at visual acuity (VA) levels of <3/60 (Blindness (BL)), ≥3/60 and <6/60 (severe visual impairment (SVI)), ≥6/60 and <6/18 (moderate visual impairment (MVI)), ≥6/18 and <6/12 (early visual impairment (EVI)).ResultsThe estimated prevalence of cataract BL was 0.61% (95% CI 0.42 to 0.87). With best corrected VA, the estimated prevalence of SVI from cataract was 0.86% (95% CI 0.63 to 1.17); MVI was 2.39% (95% CI 2.00 to 2.87) and EVI was 5.21% (95% CI 4.61 to 5.87). Women in TAPK had a significantly higher prevalence of cataract BL (0.82%, 95% CI 0.54 to 2.15) than men (0.34%, 95% CI 0.16 to 0.70). Women had lower cataract surgical coverage (CSC) by eyes (60.8%, 95% CI 55.5 to 65.8) compared with men (70.1%; 95% CI 63.7 to 75.7). The prevalence of cataract BL was higher among Tibetan (2.28%; 95% CI 1.98 to 2.62) than Han Chinese (1.01%%; 95% CI 0.54% to 1.87%). Overall CSC by person with BL (by better eye) was 82.0% (95% CI 75.2 to 87.6). Among cataract-operated participants, 71.2% had VA equal to or better than 6/18.ConclusionsThe study detected a low prevalence of VI and BL due to cataract with high CSC in the study area compared with many other places in China. Further actions should be taken to improve cataract surgical outcome.

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