Influence of severity and types of astigmatism on visual acuity in school-aged children in southern China

作     者：Li-Li Wang Wei Wang Xiao-Tong Han Ming-Guang He 

作者机构：Zhongshan Ophthalmic CenterState Key Laboratory of OphthalmologySun Yat-Sen University 

出 版 物：《International Journal of Ophthalmology(English edition)》 (国际眼科杂志（英文版）)

年 卷 期：2018年第11卷第8期

页      面：1377-1383页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 

基　　金：Supported by the World Health Organization under National Institute of Health contract N01-EY-2103 Fundamental Research Funds of the State Key Laboratory in Ophthalmology National Natural Science Foundation of China (No.81125007) The Research Accelerator Program was at University of Melbourne and the CERA Foundation The Centre for Eye Research Australia receives Operational Infrastructure Support from the Victorian State Government 

主　　题：astigmatism visual acuity children population-based study 

摘      要：AIM： To investigate the influence of astigmatism on visual acuity in school-aged children, and to define a cutoff for clinically significant astigmatism. METHODS： This is a population-based, cross-sectional study. Among 5053 enumerated children aged 5-15 y in Guangzhou, 3729（73.8%） children aged 7-15 with successful cycloplegic auto-refraction（1% cyclopentolate） and a reliable visual acuity measurement were included. Ocular measurement included external eye, anterior segment, media and fundus and cycloplegic auto-refraction. Primary outcome measures included the relationship between severity and subtypes of astigmatism and the prevalence of visual impairment. Three criteria for visual impairment were adopted： best-corrected visual acuity（BCVA） ≤0.7, uncorrected visual acuity（UCVA） ≤0.5 or 〈0.7 in the right ***： Increases of cylinder power was significantly associated with worse visual acuity（UCVA： β=0.051, P〈0.01; BCVA： β=0.025, P〈0.001）. A substantial increase in UCVI and BCVI was seen with astigmatism of 1.00 diopter（D） or more. Astigmatism ≥1.00 D had a greater BCVI prevalence than cylinder power less than 1.00 D（OR=4.20, 95%CI： 3.08-5.74）, and this was also true for hyperopic, emmetropic and myopic refraction categories. Oblique astigmatism was associated with a higher risk of BCVI relative to with the rule astigmatism in myopic refractive category（OR=12.87, 95%CI： 2.20-75.38）.CONCLUSION： Both magnitude and subtypes of astigmatism influence the prevalence of visual impairment in school children. Cylinder ≥1.00 D may be useful as a cutoff for clinically significant astigmatism.