title: The prevalence of glaucoma in adult rural Chinese populations of the Bai nationality in Dali: the Yunnan Minority Eye Study.
abstract: OBJECTIVE
  We evaluated the prevalence of glaucoma in adults of the Bai Nationality populations in rural China.
  
  
  METHODS
  A population-based survey of Chinese Bai Nationality aged ≥50 years from randomly selected block groups in southwestern China was conducted. Eligible persons were invited to local examination sites for a complete ophthalmic examination. Glaucoma was diagnosed using the International Society of Geographical and Epidemiological Ophthalmology Classification scheme.
  
  
  RESULTS
  In the study, 2133 subjects (77.8% participation rate) were examined, with a crude prevalence of all glaucoma of 2.2% (95% confidence interval [CI] 1.6%-2.9%). Primary open angle glaucoma (POAG) was found in 1.0% of cases (95% CI 0.6%-1.6%) and primary angle-closure glaucoma (PACG) in 0.9% (95% CI 0.6%-1.4%). The prevalence of all glaucoma was significantly higher in older people and women. Mean intraocular pressure (IOP) was 16.17 ± 3.74 mm Hg (97.5th and 99.5th percentiles, 24 mm Hg and 30 mm Hg, respectively). The mean vertical cup-to-disc ratio (VCDR) was 0.43 ± 0.17 (97.5th and 99.5th percentiles 0.7 and 0.8, respectively). Unilateral blindness was found in 80% of PACG, compared to only 36.3% of POAG cases.
  
  
  CONCLUSIONS
  Prevalence of POAG is similar to PACG in the ethnic Bai population living in rural southwestern China. PACG has a worse visual impairment and prognosis compared to POAG.
authors.affiliation: First Affiliated Hospital of Kunming Medical University, Kunming, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Zhong
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Cairui
authors.initials: C
authors.lastname: Li
authors.forename: Tao
authors.initials: T
authors.lastname: Wei
authors.forename: Xueping
authors.initials: X
authors.lastname: Cha
authors.forename: Ning
authors.initials: N
authors.lastname: Cai
authors.forename: Tinghao
authors.initials: T
authors.lastname: Luo
authors.forename: Minbin
authors.initials: M
authors.lastname: Yu
authors.forename: Yuansheng
authors.initials: Y
authors.lastname: Yuan
mesh_terms: D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D002681:China / Q000453:epidemiology; D005006:Ethnicity; D005260:Female; D005901:Glaucoma / Q000208:ethnology* / Q000503:physiopathology; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D008913:Minority Groups; D011159:Population Surveillance / Q000379:methods*; D015995:Prevalence; D012424:Rural Population; D017678:Sex Distribution; D014792:Visual Acuity