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Epidemiological study on myopia among primary school students in Xindu District of Chengdu in 2018-2020
International Eye Science ; 22(1):148-152, 2022.
Article in Chinese | EMBASE | ID: covidwho-1580279
ABSTRACT

AIM:

To observe the epidemiological characteristics of myopia among primary school students in Xindu District of Chengdu before and after COVID-19 home isolation period (from Jan.-May 2020).

METHODS:

Cross-sectional study. A total of 10 153 primary school students from grade 1-6 (age 6-13, three classes per grade) were selected from four primary schools in Xindu District of Chengdu for three consecutive years (2018-2020), by using a random stratified cluster sampling method. All students' visual acuity and spherical equivalent refraction (SE) were measured, a further cycloplegia optometry was conducted for those whose visual acuity was less than 5.0. The SE was recorded and the prevalence of myopia was calculated. Chi-square test was used to compare the difference of prevalence of myopia between different years. One-way Anova was used to compare the difference of SE among different years.

RESULTS:

There was statistical difference in prevalence of myopia between the three years (2018 35.98%, 2019 36.29%, 2020 42.52%;χ2=39.374, P<0.001). The prevalence of myopia among 6-9 years old students increased significantly in 2020 (P<0.01). They were 2.20 times (6 years old), 2.08 times (7 years old), 1.36 times (8 years old) and 1.24 times (9 years old) of the previous year. Students aged 6-9 years showed an obvious myopic shift in SE in 2020 (P<0.05). The increases were -0.34±0.76D (6 years old), -0.28±0.84D (7 years old), -0.29±1.41D (8 years old) and -0.18±1.35D (9 years old) than the previous year. The prevalence of myopia and SE remained stable among 10-13 years old students in 2018-2020 (P>0.05).

CONCLUSION:

After the COVID-19 home isolation period, there was a significant myopic shift among students aged 6-9 years old. We should pay more attention to the window period for myopia prevention and control of 6-9 years old.
Keywords

Full text: Available Collection: Databases of international organizations Database: EMBASE Type of study: Observational study Language: Chinese Journal: International Eye Science Year: 2022 Document Type: Article

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Full text: Available Collection: Databases of international organizations Database: EMBASE Type of study: Observational study Language: Chinese Journal: International Eye Science Year: 2022 Document Type: Article