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 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 Prevalence and causes of visual impairment amongst older adults in a rural area of North India: a cross-sectional study

BMJ Open ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. e018894 ◽  
Author(s):  
Sumit Malhotra ◽  
Praveen Vashist ◽  
Mani Kalaivani ◽  
Noopur Gupta ◽  
Suraj Singh Senjam ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Visual Impairment ◽  
Rural Population ◽  
Associated Factors ◽  
Cross Sectional Study ◽  
North India ◽  
Refractive Errors ◽  
Sectional Study ◽  
Cross Sectional ◽  
Common Causes

ObjectivesTo determine the prevalence, causes and associated factors for visual impairment (VI) in rural population of Jhajjar district, Haryana, north India.MethodsA community-based, cross-sectional study was conducted in two blocks of Jhajjar district. A total of 34 villages were selected using probability proportionate to size sampling method. Adults aged 50 years and above were selected using compact segment cluster sampling approach. Presenting visual acuity using LogMAR E chart was measured along with collection of other demographic details as part of the house-to-house survey. Subjective refraction and torch light examination were performed at a clinic site within the village to ascertain VI and its cause. VI was considered when presenting visual acuity was less than 6/18 in the better eye. Common causes of VI viz uncorrected refractive errors, cataract, central corneal opacity and others were noted by optometrists. Descriptive analysis was undertaken. Multivariate logistic regression analysis was performed for determining associated factors with VI.ResultsOut of 2025 enumerated adults, 1690 (83.5%) were examined at the household level and 1575 (78%) completed all study procedures. The prevalence of VI was found to be 24.5% (95% CI 21.1 to 26.3) and blindness was 5% (95% CI 3.9 to 6.1). The most common causes of VI were uncorrected refractive errors (50%) and cataract (37%). The VI in study participants was found to be associated with age, gender, marital and educational status.ConclusionsVI is still a public health problem in rural population of Jhajjar district, Haryana. Provision of spectacles and cataract surgical services are simple interventions to address this issue.

scholarly journals Ultraviolet-related ocular problems in children living on the coast of Southwest Sumba, Indonesia

2018 ◽  
Vol 58 (3) ◽  
pp. 128-32
Author(s):  
Ratna Sitompul ◽  
Rita Sitorus ◽  
Julie Barliana ◽  
Rossalyn Andrisa ◽  
Budiman Prakoso ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Ultraviolet Radiation ◽  
Visual Impairment ◽  
Population Based ◽  
Cross Sectional Study ◽  
Predisposing Factors ◽  
Uv Exposure ◽  
Sectional Study ◽  
Cross Sectional ◽  
Early Signs

Background A previous study has shown a high proportion of visual impairment and blindness in the adults of Southwest Sumba, Indonesia due to ultraviolet-radiation (UVR)- related ocular problems, such as cataract and pterygium. Currently, there is no data regarding the effect of ultraviolet (UV) exposure on children and its future implications. Objective To seek the predisposing factors of UVR ocular problems in the children of Southwest Sumba. Methods A population-based cross-sectional study was conducted in Perokonda Village, Southwest Sumba in May 2017. A total of 337 children <16 years old were examined for ocular problems by ophthalmologists. Subjects with ocular problems were then treated accordingly. Results Visual acuity was normal in 98.2% of subjects. Visual impairment and blindness were found in 1.2% and 0.3% of subjects, respectively. Ocular problems were found in 38%, consisting of conjunctival pigment deposits (60.2%), pinguecula (15.6%), and pterygium (13.3%). The UVR ocular problems constituted 33.8% of all ocular problems, comprising conjunctival pigment deposits (22.8%), pinguecula (6%), and pterygium (5%). Conclusion The proportion of UVR ocular problems in the children of Perokonda village is 34.5%, the most common of which being conjunctival pigment deposits. Such deposits may be early signs of UVR ocular problems. This study serves as a platform to highlight the possible relationship between pigment deposits and future UVR ocular problems, which warrants further study.    

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

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.

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