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Prevalence and associations of myopia in Hong Kong primary school students

  • Clinical Investigation
  • Published:
Japanese Journal of Ophthalmology Aims and scope Submit manuscript

Abstract

Purpose

To examine the prevalence of myopia in primary school children in Hong Kong, and the risk factors for myopia development.

Study design

A cross-sectional study.

Methods

Subjective refraction and axial length were measured in all participants. Structured questionnaire was completed by the parents to assess risk factors of myopia.

Results

A total of 1396 children (491 boys) from Grade 1 to Grade 6 from 4 primary schools in Sham Shui Po district of Hong Kong participated. All participants underwent non-cycloplegic refraction. The overall prevalence of myopia (spherical equivalent, SE ≤ -0.5 diopter [D]) was 37.7%, which significantly increased with age, from 13.3% at grade 1 to 54.7% at grade 6. The prevalence of moderate myopia (-3.0D < SE < -6.0D) increased from 1.6% at grade 1 to 18.2% at grade 6 and the prevalence of high myopia (SE < = -6.0 D and/or AL ≥ 26.5 mm) increased from 0.94% (7/747) in grade 1-3 students to 1.85% (12/649) in grade 4-6 students. Among the students with myopia, only 23.6% of the parents knew their children had refractive errors and only 19.8% of the children wore glasses. Multivariate logistic regression analysis showed myopia development was significantly associated with older age (OR = 1.36, P = 0.008), better academic ranking in class in the preceding semester (OR = 1.01, P = 0.02) and absence of routine eye check (OR = 2.70, P = 0.001).

Conclusion

The prevalence of myopia in primary school students in Hong Kong is high. There is a low level of awareness of refractive errors among parents, and high proportion of under-correction, resulting in suboptimal vision.

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Acknowledgements

The study was partly supported by Eye Care Charitable Foundation

Author information

Authors and Affiliations

  1. Department of Ophthalmology, LKS Faculty of Medicine, The University of Hong Kong, Pok Fu Lam, Hong Kong

    Bonnie Nga Kwan Choy, Ming Ming Zhu, Jimmy Shiu Ming Lai, Alex Lap Ki Ng & Ian Yat Hin Wong

  2. Casey Eye Institute, Oregon Health & Science University, Portland, USA

    Qisheng You

  3. Department of Ophthalmology, Hong Kong Sanatorium and Hospital, Happy Valley, Hong Kong

    Ian Yat Hin Wong

Authors
  1. Bonnie Nga Kwan Choy
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  2. Qisheng You
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  3. Ming Ming Zhu
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  4. Jimmy Shiu Ming Lai
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  6. Ian Yat Hin Wong
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Corresponding author

Correspondence to Ian Yat Hin Wong.

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Conflicts of interest

B.N.K.Choy, None; Q.You, None; M.M.Zhu, None; J.S.M.Lai, None; A.L.K.Ng, None; I.Y.H.Wong, None.

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Corresponding Author: Ian Yat Hin Wong

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Choy, B.N.K., You, Q., Zhu, M.M. et al. Prevalence and associations of myopia in Hong Kong primary school students. Jpn J Ophthalmol 64, 437–449 (2020). https://doi.org/10.1007/s10384-020-00733-4

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  • DOI: https://doi.org/10.1007/s10384-020-00733-4

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