Okosa, Michael Chuka, et al. “Clinical Features of Primary Open Angle Glaucoma at Initial Presentation: Experience at a Tertiary Eye Care Center in Nigeria”. Journal of Ophthalmology and Research, vol. 4, no. 3, Aug. 2021, pp. 244-53, https://fortunejournals.org/ojs/index.php/jor/article/view/17410.