Leng, Ting Siew, et al. “Visual Health and Its Relationship With Screen Time Among School Children: A Cross-Sectional Study in Sarawak, Malaysia”. International Journal of Online and Biomedical Engineering (iJOE), vol. 17, no. 08, Aug. 2021, pp. pp. 168-175, doi:10.3991/ijoe.v17i08.24607.