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Hua Zhong, Jun Li, Cairui Li, Tao Wei, Xueping Cha, Ning Cai, Tinghao Luo, Minbin Yu, Yuansheng Yuan; The Prevalence of Glaucoma in Adult Rural Chinese Populations of the Bai Nationality in Dali: The Yunnan Minority Eye Study. Invest. Ophthalmol. Vis. Sci. 2012;53(6):3221-3225. doi: 10.1167/iovs.11-9306.
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evaluated the prevalence of glaucoma in adults of the Bai Nationality populations in rural China.
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.
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.
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.
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