Efendi, S., N. Sriyanah, F. Fatmawati, P. H. Livana, A. Suswani, and N. Nuratifah. “Duration of Smartphone Usage in Online Learning During the COVID-19 Pandemic and the Occurrence of Computer Vision Syndrome in the Students of MTsN 1 Bone”. International Journal of Health Sciences, vol. 6, no. S5, Aug. 2022, pp. 7652-9, doi:10.53730/ijhs.v6nS5.11668.