Echieh , C. I., E. Egbula, A. Besong, and I. Affiong. “Assessment of Topical Drug Instillation Techniques Among Glaucoma Patients in a Tertiary Institution in Nigeria”. Transactions of the Ophthalmological Society of Nigeria, vol. 6, no. 1, Aug. 2021, https://tosn.org.ng/index.php/home/article/view/63.