Teerasantipun, Chonwipha, Wittaya Pichetweerachai, Triyapa Theerakul, Warut Chaiwong, and Chaiyos Kunanusont. 2019. “Validity of Vision Screener Among Workers in a Private Hospital in the Northern Part of Thailand”. The Bangkok Medical Journal 15 (2), 140. https://doi.org/10.31524/bkkmedj.2019.09.002.