title: Prevalence of Age-Related Cataract and Cataract Surgery in a Chinese Adult Population: The Taizhou Eye Study.
abstract: OBJECTIVE
  To study the prevalence of age-related cataract (ARC), cataract surgery, and visual outcomes in a Chinese adult population in Taizhou, China.
  
  
  METHODS
  A population-based, cross-sectional study was conducted using a random cluster sampling method. We evaluated 10,234 eligible subjects 45 years or older (response rate 78.1%) in the Taizhou Eye Study. We conducted a detailed eye examination in all participants, including presenting visual acuity (PVA), best-corrected visual acuity (BCVA), slit-lamp assessment of lens opacities using the Lens Opacities Classification System III (LOCS III), and fundus examination.
  
  
  RESULTS
  The standardized prevalences of cortical, nuclear, and posterior subcapsular cataract (PSC) were 28.6%, 24.3%, and 4.4%, respectively, and combined nuclear and cortical cataract was the most common cataract type (40.0%). According to the US visual impairment (VI) criteria and World Health Organization VI criteria, 40.6% and 21.8% of PSC participants had binocular VI, respectively; these values were higher than the VI rates in cortical and nuclear cataract (all P < 0.001). Of 148 patients (3.5%) who had cataract surgeries, 41.2% had PVA <20/63, and 19.6% had PVA <20/200. The main causes of poor visual outcome after cataract surgery were ocular comorbidities (41.3%), uncorrected refractive error (30.0%), surgical complications (15.0%), and posterior capsular opacification (PCO; 13.7%).
  
  
  CONCLUSIONS
  The high prevalence of cataract and high rate of VI from ARC in the adult Chinese population remains a severe public health problem. Cataract surgery remains insufficient in mainland China and poor visual outcomes were frequent. Surgical complications and PCO were important avoidable causes that attributed to poor visual outcomes after cataract surgeries.
authors.affiliation: Department of Ophthalmology, Eye and ENT Hospital of Fudan University, Xuhui District, Shanghai, China 2Myopia Key Laboratory of the Health Ministry and Visual Impairment and Reconstruction Key Laboratory of Shanghai, Shanghai, China.
authors.forename: Yating
authors.initials: Y
authors.lastname: Tang
authors.affiliation: State Key Laboratory of Genetic Engineering and MOE Key Laboratory of Contemporary Anthropology, Collaborative Innovation Center for Genetics and Development, School of Life Sciences and Institutes of Biomedical Sciences, Fudan University, Shanghai, China.
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Genetic Engineering and MOE Key Laboratory of Contemporary Anthropology, Collaborative Innovation Center for Genetics and Development, School of Life Sciences and Institutes of Biomedical Sciences, Fudan University, Shanghai, China.
authors.forename: Jiucun
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Ophthalmology, Taixing People's Hospital, Taixing, Jiangsu Province, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Huang
authors.affiliation: Department of Ophthalmology, Taixing People's Hospital, Taixing, Jiangsu Province, China.
authors.forename: Yaping
authors.initials: Y
authors.lastname: Gao
authors.affiliation: Department of Ophthalmology, Eye and ENT Hospital of Fudan University, Xuhui District, Shanghai, China 2Myopia Key Laboratory of the Health Ministry and Visual Impairment and Reconstruction Key Laboratory of Shanghai, Shanghai, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Luo
authors.affiliation: Department of Ophthalmology, Eye and ENT Hospital of Fudan University, Xuhui District, Shanghai, China 2Myopia Key Laboratory of the Health Ministry and Visual Impairment and Reconstruction Key Laboratory of Shanghai, Shanghai, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Yang
authors.affiliation: Department of Ophthalmology, Eye and ENT Hospital of Fudan University, Xuhui District, Shanghai, China 2Myopia Key Laboratory of the Health Ministry and Visual Impairment and Reconstruction Key Laboratory of Shanghai, Shanghai, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Lu
mesh_terms: D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging; D002386:Cataract / Q000453:epidemiology* / Q000209:etiology / Q000503:physiopathology; D002387:Cataract Extraction / Q000706:statistics & numerical data*; D002681:China / Q000453:epidemiology; D016000:Cluster Analysis; D003430:Cross-Sectional Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011159:Population Surveillance; D015995:Prevalence; D012189:Retrospective Studies; D012424:Rural Population; D017678:Sex Distribution; D014792:Visual Acuity