PURPOSE: To estimate the prevalence and distribution of blindness and low vision in Northern China. DESIGN: Population-based cohort study. METHODS: The Beijing Eye Study included 4438 subjects with an age of 40+ years...PURPOSE: To estimate the prevalence and distribution of blindness and low vision in Northern China. DESIGN: Population-based cohort study. METHODS: The Beijing Eye Study included 4438 subjects with an age of 40+ years. Mean age was 56.2± 10.6 years (range,40 to 101 years). RESULTS: Fortythree (1.0% ) individuals had low vision (< 20/60 and ≥ 20/400 best-corrected vision),and 17 (0.4% ) individuals were blind (best-corrected visual acuity in the better-seeing eye < 20/400). Low vision/blindness were significantly associated with age (P < .001),myopic refractive error (P < .001),and level of educational background (P=.035). It was not associated with gender (P=.76) and rural vs urban area (P=.88). CONCLUSIONS: Blindness or low vision affects approximately one in 100 Chinese older than 40 years. An estimated 4.1 million Chinese older than 40 years have low vision,and an estimated 1.6 million Chinese older than 40 years are blind.展开更多
Aim: To determine the optic disc size in the adult Chinese population in an urban and a rural region of Beijing. Methods: The population based, cross sectional cohort study included 4439 subjects out of 5324 subjects ...Aim: To determine the optic disc size in the adult Chinese population in an urban and a rural region of Beijing. Methods: The population based, cross sectional cohort study included 4439 subjects out of 5324 subjects invited to participate (response rate 83.4% ). It was divided into a rural part (1973 (44.4% )-subjects) and an urban part (2466 (55.6% ) subjects). Mean age was 56.2 (SD 10.6) years (range 40- 101 years). Colour optic disc photographs were morphometrically examined. Main outcome measure was optic disc area. Results: Optic disc photographs were available for 4027 (90.7% ) subjects. Mean optic disc area measured 2.65 (0.57)mm (range 1.03mm2- 7.75 mm2). Optic disc area was significantly (p< 0.001) correlated with myopic refractive error, with a steep decrease in optic disc area from high myopia to the mid-range of refractive error, a slightly horizontal course in the refractive error range between - 8 dioptres and + 4 dioptres, and a further decrease in optic disc area towards higher hyperopia. Optic disc area was not related to age (p=0.14) or sex (p=0.93) (optic disc area, males: 2.65 (0.56) mm2 versus females: 2.65 (0.57) mm2). "Microdiscs" may be defined as smaller than 1.51 mm2, and “ macrodiscs” as larger than 3.79 mm2. Conclusions: Compared with data of preceding studies, mean optic disc size is larger in Chinese people than in white people. In Chinese people highly hyperopic eyes have significantly smaller optic discs, and highly myopic eyes have significantly larger optic discs than emmetropic eyes.展开更多
文摘PURPOSE: To estimate the prevalence and distribution of blindness and low vision in Northern China. DESIGN: Population-based cohort study. METHODS: The Beijing Eye Study included 4438 subjects with an age of 40+ years. Mean age was 56.2± 10.6 years (range,40 to 101 years). RESULTS: Fortythree (1.0% ) individuals had low vision (< 20/60 and ≥ 20/400 best-corrected vision),and 17 (0.4% ) individuals were blind (best-corrected visual acuity in the better-seeing eye < 20/400). Low vision/blindness were significantly associated with age (P < .001),myopic refractive error (P < .001),and level of educational background (P=.035). It was not associated with gender (P=.76) and rural vs urban area (P=.88). CONCLUSIONS: Blindness or low vision affects approximately one in 100 Chinese older than 40 years. An estimated 4.1 million Chinese older than 40 years have low vision,and an estimated 1.6 million Chinese older than 40 years are blind.
文摘Aim: To determine the optic disc size in the adult Chinese population in an urban and a rural region of Beijing. Methods: The population based, cross sectional cohort study included 4439 subjects out of 5324 subjects invited to participate (response rate 83.4% ). It was divided into a rural part (1973 (44.4% )-subjects) and an urban part (2466 (55.6% ) subjects). Mean age was 56.2 (SD 10.6) years (range 40- 101 years). Colour optic disc photographs were morphometrically examined. Main outcome measure was optic disc area. Results: Optic disc photographs were available for 4027 (90.7% ) subjects. Mean optic disc area measured 2.65 (0.57)mm (range 1.03mm2- 7.75 mm2). Optic disc area was significantly (p< 0.001) correlated with myopic refractive error, with a steep decrease in optic disc area from high myopia to the mid-range of refractive error, a slightly horizontal course in the refractive error range between - 8 dioptres and + 4 dioptres, and a further decrease in optic disc area towards higher hyperopia. Optic disc area was not related to age (p=0.14) or sex (p=0.93) (optic disc area, males: 2.65 (0.56) mm2 versus females: 2.65 (0.57) mm2). "Microdiscs" may be defined as smaller than 1.51 mm2, and “ macrodiscs” as larger than 3.79 mm2. Conclusions: Compared with data of preceding studies, mean optic disc size is larger in Chinese people than in white people. In Chinese people highly hyperopic eyes have significantly smaller optic discs, and highly myopic eyes have significantly larger optic discs than emmetropic eyes.
