Chen-Wei Pan1, Qin Chen2, Xun Sheng3, Jun Li3, Zhiqiang Niu3, Hua Zhou3, Tao Wei4, Yuansheng Yuan3, Hua Zhong3. 1. Jiangsu Key Laboratory of Preventive and Translational Medicine for Geriatric Diseases School of Public Health, Medical College of Soochow University, Suzhou, China. 2. First Affiliated Hospital of Nanjing Medical University, Nanjing, China. 3. First Affiliated Hospital of Kunming Medical University, Kunming, China. 4. Kunming Medical University, Kunming, China.
Abstract
PURPOSE: To determine the prevalence of myopia and ocular biometry in population-based samples of ethnic Yi and Han people living in an inland rural community in China. METHODS: A random cluster sampling strategy was used to select ethnic Han and Yi adults aged 50 years or older living in Yunnan. Refractive error was determined by subjective refraction and ocular biometric parameters, including axial length (AL), anterior chamber depth (ACD), vitreous chamber depth (VCD), and lens thickness (LT), which were measured using an Echoscan. RESULTS: Adults of Yi ethnicity had lower prevalence of myopia (10.3% vs. 8.1%; P = 0.02) and high myopia (2.3% vs. 1.6%; P = 0.10) than their counterparts of Han ethnicity. The prevalence of myopia increased with age (P for trend < 0.05), whereas the mean AL did not differ significantly among age groups in both ethnic groups (both P for trend > 0.05). In multivariate analysis, time spent outdoors was associated with myopia (P = 0.003) and AL (P < 0.001) but not high myopia (P = 0.33). No interaction effect was detected between ethnicity and other risk factors on myopia (all P > 0.05). Adjustment for lens nuclear opacity score reduced the excess prevalence of myopia in Han ethnicity by 37.5%. CONCLUSIONS: There was little evidence showing that ethnic disparities existed in the prevalence and risk factors between the major and minor ethnic groups living in the same communities in rural China. The "cohort effect" on myopia observed in many other populations was not seen in this study.
PURPOSE: To determine the prevalence of myopia and ocular biometry in population-based samples of ethnic Yi and Han people living in an inland rural community in China. METHODS: A random cluster sampling strategy was used to select ethnic Han and Yi adults aged 50 years or older living in Yunnan. Refractive error was determined by subjective refraction and ocular biometric parameters, including axial length (AL), anterior chamber depth (ACD), vitreous chamber depth (VCD), and lens thickness (LT), which were measured using an Echoscan. RESULTS: Adults of Yi ethnicity had lower prevalence of myopia (10.3% vs. 8.1%; P = 0.02) and high myopia (2.3% vs. 1.6%; P = 0.10) than their counterparts of Han ethnicity. The prevalence of myopia increased with age (P for trend < 0.05), whereas the mean AL did not differ significantly among age groups in both ethnic groups (both P for trend > 0.05). In multivariate analysis, time spent outdoors was associated with myopia (P = 0.003) and AL (P < 0.001) but not high myopia (P = 0.33). No interaction effect was detected between ethnicity and other risk factors on myopia (all P > 0.05). Adjustment for lens nuclear opacity score reduced the excess prevalence of myopia in Han ethnicity by 37.5%. CONCLUSIONS: There was little evidence showing that ethnic disparities existed in the prevalence and risk factors between the major and minor ethnic groups living in the same communities in rural China. The "cohort effect" on myopia observed in many other populations was not seen in this study.
Authors: Siddharth K Karthikeyan; D L Ashwini; M Priyanka; Anush Nayak; Sayantan Biswas Journal: Indian J Ophthalmol Date: 2022-03 Impact factor: 2.969
Authors: Virgilio Galvis; Alejandro Tello; M Margarita Parra; Jesus Merayo-Lloves; Jaime Larrea; Carlos Julian Rodriguez; Paul Anthony Camacho Journal: Med Hypothesis Discov Innov Ophthalmol Date: 2016