Association between Near Work, Physical Activities and Myopia in Korean Adults During COVID-19 Outbreak.

Purpose: This study investigated the relationship between near work hours and myopia in Korean adults.

Methods: We used data from the 2021 Korean National Health and Nutrition Examination Survey. Associations between near work time, physical activity, and myopia were assessed using chi-square tests and multiple logistic regression analyses.

Results: The overall prevalence of myopia was 60.2% in adults aged 19-59 years. The prevalence of myopia was 46.2% for individuals who used smart devices for less than one hour per day, while it was 68.0% for those who used smart devices for more than four hours. In the multiple logistic regression analysis, the odds ratio (OR) for myopia was significantly higher among individuals using smart devices for 3 hours (OR = 1.55, 95% CI = 1.08-2.23) or more than 4 hours (OR = 1.75, 95% CI = 1.27-2.42), compared to users with less than 1 hour of usage. Regarding sitting time, the OR for myopia was significantly higher in individuals who sat for more than 12 hours (OR = 1.66, 95% CI = 1.05-2.61) compared to those who sat less than 4 hours.

Conclusion: This study found that near work and sitting times were positively associated with myopia. Given the high prevalence of myopia and its implications for serious eye diseases, it is essential to implement measures to manage myopia. Considering the increased near work hours resulting from the COVID-19 pandemic, it is necessary to adopt supplementary measures, such as ensuring sufficient rest time for the eyes and adjusting the brightness of lights, to improve eye health.