Liang Xu
Visual acuity in northern China in an urban and rural population: the Beijing Eye Study
Beijing Tongren Hospital
evaluate prevalence demographic associations visual impairment urban rural population northern chinain beijing eye study population based cohort study northern china visual acuity assessed 8876 eyes 4438 subjects according response rate 834 study divided rural part 1972 subjects urban part n2466 mean age 5620 sd 1059 years median 56 years range 40101 yearsmean uncorrected visual acuity measured 072 032 median 080 mean best corrected visual acuity measured 091 021 median 10 multiple regression analysis best corrected visual acuity significantly correlated age p0001 degree nuclear cataract p0001 amount cortical cataract p0014 amount subcapsular cataract p0001 educational background p0001 refractive error p0001 rural region versus urban region p034 sex p0053 statistically significantly associated best corrected visual acuityin northern china determinants low degree best corrected visual acuity age cataract low educational background myopia despite marked differences educational background family income sex rural area versus urban area markedly associated best corrected visual acuity