July 2019
Volume 60, Issue 9
Free
ARVO Annual Meeting Abstract  |   July 2019
Two-Year Incidence of Myopia among Schoolchildren in China
Author Affiliations & Notes
  • Damien Paille
    Vision Science Department, Essilor, Singapore, Singapore
    WEIRC - WMU-Essilor International Research Centre, Wenzhou, Zhejiang, China
  • Yee Ling WONG
    Vision Science Department, Essilor, Singapore, Singapore
    Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore, Singapore
  • Yimin Yuan
    WMU - Wenzhou Medical University, Wenzhou, Zhejiang, China
    WEIRC - WMU-Essilor International Research Centre, Wenzhou, Zhejiang, China
  • Binbin Su
    WMU - Wenzhou Medical University, Wenzhou, Zhejiang, China
    WEIRC - WMU-Essilor International Research Centre, Wenzhou, Zhejiang, China
  • Miaomiao Li
    WMU - Wenzhou Medical University, Wenzhou, Zhejiang, China
    WEIRC - WMU-Essilor International Research Centre, Wenzhou, Zhejiang, China
  • Ding Yang
    WMU - Wenzhou Medical University, Wenzhou, Zhejiang, China
    WEIRC - WMU-Essilor International Research Centre, Wenzhou, Zhejiang, China
  • Jinhua Bao
    WMU - Wenzhou Medical University, Wenzhou, Zhejiang, China
    WEIRC - WMU-Essilor International Research Centre, Wenzhou, Zhejiang, China
  • Bjorn Drobe
    Vision Science Department, Essilor, Singapore, Singapore
    WEIRC - WMU-Essilor International Research Centre, Wenzhou, Zhejiang, China
  • Hao Chen
    WMU - Wenzhou Medical University, Wenzhou, Zhejiang, China
    WEIRC - WMU-Essilor International Research Centre, Wenzhou, Zhejiang, China
  • Footnotes
    Commercial Relationships   Damien Paille, ESSILOR INTL (E); Yee Ling WONG, ESSILOR INTL (E); Yimin Yuan, ESSILOR INTL (F); Binbin Su, ESSILOR INTL (F); Miaomiao Li, ESSILOR INTL (F); Ding Yang, ESSILOR INTL (F); Jinhua Bao, ESSILOR INTL (F); Bjorn Drobe, ESSILOR INTL (E); Hao Chen, ESSILOR INTL (F)
  • Footnotes
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Investigative Ophthalmology & Visual Science July 2019, Vol.60, 5833. doi:
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      Damien Paille, Yee Ling WONG, Yimin Yuan, Binbin Su, Miaomiao Li, Ding Yang, Jinhua Bao, Bjorn Drobe, Hao Chen; Two-Year Incidence of Myopia among Schoolchildren in China. Invest. Ophthalmol. Vis. Sci. 2019;60(9):5833.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : Myopia is the most common type of refractive error affecting children. The WEPrOM (Wenzhou Medical University Essilor Progression and Onset of Myopia) study is a 4-year prospective cohort study that evaluates the incidence and progression of myopia, and associated risk factors in schoolchildren from urban and rural areas in Wenzhou, China. The present work aims to examine the incidence of myopia and associated risk factors over a 2-year period in this population.

Methods : The WEPrOM study is a prospective longitudinal study comprising 1,103 schoolchildren aged 7 to 11 years with complete refraction data at baseline visit. At 2-year follow-up (FU), 1,024 (92.8%) children were re-examined and had complete refraction data. Subjective refraction was measured at baseline and FU. Myopia was defined as a spherical equivalent (SE) of ≤ -0.5 diopters (D). Incident myopia was defined as the development of myopia (non-myopic at baseline and myopic at FU). Lifestyle questionnaires were filled at each visit by the parents.

Results : Among 1,103 schoolchildren at baseline visit, the prevalence rate of myopia was 19.2%. Of 891 non-myopes at baseline visit, 830 attended the 2-year FU. Over a 2-year period, the incidence rate of myopia was 27.6% (95% confidence interval [CI], 24.5-30.6%), with 229 of 830 schoolchildren who developed myopia. Less hyperopic SE (p<0.001), longer axial length (p=0.02), lower positive relative accommodation (PRA) (p<0.001) and female gender (p=0.005) were associated with incident myopia using multivariate logistic regression model. There was no significant difference in 2-year incidence of myopia between rural (27.2%; 95% CI, 21.2-33.2%; N = 217) and urban (27.7%; 95% CI, 24.2-31.3%; N = 613) schoolchildren. Age, parental myopia, outdoor time and nearwork time were not associated with incident myopia among schoolchildren.

Conclusions : The 2-year incidence rate of myopia among schoolchildren in Wenzhou was 27.6% (N = 830 at risk). This finding is in accordance with recent studies in China, where the cumulative incidence of myopia over a 2-year period was 36.2% among 1,385 schoolchildren aged 7 to 9 years in Shanghai. The incidence rates of myopia between schoolchildren residing in rural and urban areas were similar. Longer axial length, less hyperopic SE, lower PRA, and female gender appear to be predictors of myopia onset.

This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.

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