Objective: To investigate the prevalence of visual impairment and factors associated with visual impairment among people aged 50 years and above in Funing County, Jiangsu Province. Methods: Cross-sectional study. Random cluster sampling was used in selecting individuals aged ≥50 years in 30 clusters, and 5 947 individuals received visual acuity testing and eye examination. Stata 13.0 software was used to analyze the data. Multivariate logistic regression was used to detect possible factors of visual impairment such as age, gender and education. Statistical significance was defined as P< 0.05. Results: A total of 6 145 persons aged 50 years and above were enumerated, and 5 947 (96.8%) participants were examined. Based on the criteria of World Health Organization (WHO) visual impairment classification and presenting visual acuity, 138 persons were diagnosed as blindness, and 1 405 persons were diagnosed as low vision. The prevalence of blindness and low vision was 2.32% and 23.63%, respectively. And the prevalence of visual impairment was 25.95%. Based on the criteria of WHO visual impairment classification and best-corrected visual acuity, 92 persons were diagnosed as blindness, and 383 persons were diagnosed as low vision. The prevalence of blindness and low vision was 1.55% and 6.44%, respectively. And the prevalence of visual impairment was 7.99%. Concerning presenting visual acuity and best-corrected visual acuity, the prevalence of blindness and low vision was higher in old people, females and less educated persons. Cataract (46.63%) was the leading cause of blindness. Uncorrected refractive error (36.51%) was also a main cause of visual impairment. Conclusion: The prevalence of visual impairment is higher in old people, females and less educated persons in Funing County, Jiangsu Province. Cataract is still the leading cause of visual impairment. (Chin J Ophthalmol, 2017, 53: 502-508).
目的： 评估江苏省阜宁县农村50岁以上人群中视力损伤的患病情况，分析年龄、性别及受教育程度对视力损伤的影响。 方法： 横断面研究。采用整群随机抽样方法，在苏北盐城阜宁县（30个调查点），对5 947例50岁及以上人群进行视力和眼部检查。采用Stata 13.0软件进行统计分析。应用Logistic回归分析了解受检者不同年龄、性别等视力损伤情况。计量资料用均数±标准差表示，计数资料采用率或构成比表示，组间比较分别采用t检验和χ(2)检验。影响因素分析采用Logistic回归模型筛选危险因素，计算比值比（OR）和95%可信区间（CI）。 结果： 根据调查点居民户口本获得所有50岁及以上人群人员名单并进行检录，结合调查对象纳入标准，应调查6 145人，实际调查5 947人，受检率为96.8%。以世界卫生组织（WHO）视力损伤分类标准和日常生活视力（PVA）计算，盲138人，患病率为2.32%，低视力1 405人，患病率为23.63%，视力损伤的患病率为25.95%；以WHO视力损伤分类标准和最佳矫正视力（BCVA）计算，盲92人，患病率为1.55%，低视力383人，患病率为6.44%，视力损伤的患病率为7.99%。分别以PVA和BCVA计算，盲的患病率均随着年龄的增高而升高（P值均<0.05）、女性患病率高于男性（P值均<0.05）；低视力的患病率也随着年龄的增高而升高（P值均<0.05）、女性患病率也高于男性（P值均<0.05）。此外，受教育程度增高，低视力的患病率降低（P值均<0.05）。白内障是视力损伤的第一位原因，46.63%的视力损伤原因为白内障，未矫正的屈光不正也是导致视力损伤的重要原因，占视力损伤眼致病原因的36.51%。 结论： 江苏省阜宁县农村50岁及以上人群中高龄、女性、受教育程度低的人群视力损伤患病率较高。白内障仍为视力损伤的主要原因。（中华眼科杂志，2017，53：502-508）.
Keywords: Blindness; Epidemiology; Prevalence; Vision disorders; Vision, low.