![]() Moreover, it is necessary to investigate the scale of the health problems that occurred during the COVID-19 pandemic. Previous studies examining the association between VDT working hours and headache/eyestrain have mainly been conducted with adolescents or information technology (IT) workers, whereas studies targeting the general workforce are limited. Additionally, the proportion of workers reporting headache/eyestrain was 13.4% in 2006 and 19.0% during 2020–2021. 8 A comparison between the first (2006) and sixth Korean Working Conditions Survey (KWCS) (2020–2021) revealed that the proportion of workers who always used VDT throughout their working hours increased from 7.9% to 14.7%. 6, 7 The lockdown forced most people to continue using the internet and internet-based services to communicate and interact and work from home. Consequently, the VDT working hours among workers greatly increased during the COVID-19 pandemic. The coronavirus disease 2019 (COVID-19), first reported in December 2019, led to an increase in the rates of non-contact work and work from home. 2 Prolonged use of VDT can cause ocular symptoms (eyestrain, dry eyes, blurred vision, and double vision), headache, and musculoskeletal symptoms (neck, shoulder, and wrist pain). ![]() 1 It includes computer, tablets, e-readers, smartphones, and other electronic gadget. A visual display terminal (VDT) is a screening device that displays various data using a cathode ray tube, liquid crystal display, or gas plasma. ![]()
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