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postgraduate thesis: The prevalence of refractive error and visual impairment caused by uncorrected refractive error in China

TitleThe prevalence of refractive error and visual impairment caused by uncorrected refractive error in China
Authors
Issue Date2010
PublisherThe University of Hong Kong (Pokfulam, Hong Kong)
Citation
Ng, S. D. [吳兆駿]. (2010). The prevalence of refractive error and visual impairment caused by uncorrected refractive error in China. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4804331
AbstractPurpose: WHO reports 46% of world vision impairment from refractive error (RE) among children occurs in China. We estimated RE prevalence and associated vision impairment (VI) among Chinese children and adults. Methods: Data from population-based studies were stratified by gender in age intervals of 3 years (ages 3-17 y) or 10 years (ages >= 30 y): counts of persons with myopia (worse eye spherical equivalent <= -1.0D, <= -2.0D, <= -6.0D) and prevalence of low vision (< 6/12 in the better-seeing eye for children and < 6/18 for adults) and blindness (<=6/60) attributable to RE. Figures for VI included persons with habitual vision below the cutoff improving to above the cutoff with refraction, and those with myopic retinopathy. Estimates for ages 18-29 y were obtained from regression models derived from the pooled estimates. Prevalence of myopia and VI attributable to RE in each age/gender category was calculated by applying modeled rates to 2000 China census figures and projections for 2020. Association with VI attributable to RE was tested for: gender, urban versus rural residence, and residence in provinces with per capita GDP in the upper versus lower 50% for China. Results: Data were obtained from 5 cohorts for children and 14 for adults. There were 291 million and 21.4 million persons with myopia <= -1.0D and <= -6.0D respectively in 2000, expected to rise to 306 million and 36.9 million by 2020. Of these, 18.4 million were blind and 116 million had low vision in 2000, with figures of 25.3 million and 123 million in 2020. Children accounted for the following proportion of RE disease burden in China in 2000: myopia <= -1.0D: 19.0%; RE-associated low vision: 56.1%; blindness: 14.1%. Refractive error was responsible for 82.3% of blindness and 90.5% of low vision among children, and 11.6% and 64.4% of blindness and low vision among adults. Urban residence (OR 1.85, P = 0.004) and higher GDP (OR 10.6, P < 0.001) were associated with refractive blindness among children. For adults, lower GDP was associated with refractive blindness (OR 1.47, P = 0.01). Gender was un-associated with refractive blindness among children or adults. Conclusions: Both children and adults suffer a heavy burden of VI associated with RE in China. Income may affect risk for such VI differently among children and adults.
DegreeMaster of Public Health
SubjectEye - Refractive errors - China.
Vision disorders - China.
Dept/ProgramPublic Health

 

DC FieldValueLanguage
dc.contributor.authorNg, Siu-chun, Danny.-
dc.contributor.author吳兆駿.-
dc.date.issued2010-
dc.identifier.citationNg, S. D. [吳兆駿]. (2010). The prevalence of refractive error and visual impairment caused by uncorrected refractive error in China. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4804331-
dc.description.abstractPurpose: WHO reports 46% of world vision impairment from refractive error (RE) among children occurs in China. We estimated RE prevalence and associated vision impairment (VI) among Chinese children and adults. Methods: Data from population-based studies were stratified by gender in age intervals of 3 years (ages 3-17 y) or 10 years (ages >= 30 y): counts of persons with myopia (worse eye spherical equivalent <= -1.0D, <= -2.0D, <= -6.0D) and prevalence of low vision (< 6/12 in the better-seeing eye for children and < 6/18 for adults) and blindness (<=6/60) attributable to RE. Figures for VI included persons with habitual vision below the cutoff improving to above the cutoff with refraction, and those with myopic retinopathy. Estimates for ages 18-29 y were obtained from regression models derived from the pooled estimates. Prevalence of myopia and VI attributable to RE in each age/gender category was calculated by applying modeled rates to 2000 China census figures and projections for 2020. Association with VI attributable to RE was tested for: gender, urban versus rural residence, and residence in provinces with per capita GDP in the upper versus lower 50% for China. Results: Data were obtained from 5 cohorts for children and 14 for adults. There were 291 million and 21.4 million persons with myopia <= -1.0D and <= -6.0D respectively in 2000, expected to rise to 306 million and 36.9 million by 2020. Of these, 18.4 million were blind and 116 million had low vision in 2000, with figures of 25.3 million and 123 million in 2020. Children accounted for the following proportion of RE disease burden in China in 2000: myopia <= -1.0D: 19.0%; RE-associated low vision: 56.1%; blindness: 14.1%. Refractive error was responsible for 82.3% of blindness and 90.5% of low vision among children, and 11.6% and 64.4% of blindness and low vision among adults. Urban residence (OR 1.85, P = 0.004) and higher GDP (OR 10.6, P < 0.001) were associated with refractive blindness among children. For adults, lower GDP was associated with refractive blindness (OR 1.47, P = 0.01). Gender was un-associated with refractive blindness among children or adults. Conclusions: Both children and adults suffer a heavy burden of VI associated with RE in China. Income may affect risk for such VI differently among children and adults.-
dc.languageeng-
dc.publisherThe University of Hong Kong (Pokfulam, Hong Kong)-
dc.relation.ispartofHKU Theses Online (HKUTO)-
dc.rightsThe author retains all proprietary rights, (such as patent rights) and the right to use in future works.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.source.urihttp://hub.hku.hk/bib/B4804331X-
dc.subject.lcshEye - Refractive errors - China.-
dc.subject.lcshVision disorders - China.-
dc.titleThe prevalence of refractive error and visual impairment caused by uncorrected refractive error in China-
dc.typePG_Thesis-
dc.identifier.hkulb4804331-
dc.description.thesisnameMaster of Public Health-
dc.description.thesislevelMaster-
dc.description.thesisdisciplinePublic Health-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.5353/th_b4804331-
dc.date.hkucongregation2011-

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