Prevalence of myopia among children and adolescents aged 6–16 during COVID-19 pandemic: a large-scale cross-sectional study in Tianjin, China

• Published in: British journal of ophthalmology Vol. 108; no. 6; pp. 879 - 883
• Main Authors: Li, Tongtong, Wei, Ruihua, Du, Bei, Wu, Qi, Yan, Jing, Meng, Xiangda, Liu, Yuanyuan, Yang, Qiang, Kee, Chea-Su, Huang, Guowei, Yan, Hua
• Format: Journal Article
• Language: English
• Published: BMA House, Tavistock Square, London, WC1H 9JR BMJ Publishing Group Ltd 01.06.2024; BMJ Publishing Group LTD; BMJ Publishing Group
• Subjects: Adolescent; Age; Age Distribution; Betacoronavirus; Child; China - epidemiology; Coronavirus Infections - epidemiology; COVID-19; COVID-19 - epidemiology; Cross-Sectional Studies; Female; Humans; Hypothesis testing; Male; Medical research; Myopia; Myopia - epidemiology; Paediatric Ophthalmology; Pandemics; Pneumonia, Viral - epidemiology; Prevalence; SARS-CoV-2; School closures; Secondary school students; Sex Distribution; Sexes; Teenagers; Vision; Visual acuity; China; Tianjin China; Vision
• ISSN: 0007-1161; 1468-2079; 1468-2079
• DOI: 10.1136/bjo-2023-323688

PurposeThis study aimed to determine the prevalence of myopia among children and adolescents aged 6–16 years during COVID-19 pandemic in Tianjin, China.MethodsThis was a cross-sectional study using data from the Tianjin Child and Adolescent Research of Eye between March and June in 2021. A total of 909 835 children and adolescents aged 6–16 years from 1348 primary and secondary schools in Tianjin, China were recruited. Prevalence of myopia with 95% CIs was described in different regions, sexes and ages. The regions-standardised prevalence rate and chain growth rate of myopia in different ages were described the characteristics of myopia.ResultsA total of 864 828 participants (95.05% participation rate) were included in the analysis. The age range was 6–16 with a mean age of 11.50±2.79 years. The overall prevalence of myopia was 54.71% (95% CI 54.60% to 54.81%). The prevalence of myopia was 57.58% (95% CI 57.43% to 57.73%) for girls and 52.05% (95% CI 51.91% to 52.20%) for boys. Students living in the six central districts had the highest prevalence of moderate myopia (19.09% (95% CI 19.01% to 19.17%)) and high myopia (5.43% (95% CI 5.39% to 5.48%)). The regions-standardised prevalence of myopia was increased by age and the highest chain growth rate of myopia was up to 47.99% at 8 years.ConclusionsThe prevalence of myopia in Tianjin is high during COVID-19 pandemic. The progression of myopia started to increase dramatically at 8 years, and the increasing slowed down at 14 years. For policy-makers, intervention in the lower age groups may be important to control myopia progression.