Manassakorn, Anita, and Yuvaporn Tangseepha. “The Performances of Eye Drop Instillation in Glaucoma Patients”. Asian Journal of Ophthalmology 15, no. 1 (January 20, 2016): 5-14. Accessed June 24, 2019. https://asianjo.com/index.php/AsianJO/article/view/163.