visual acuity
Eldaly, M. A., M. M. Salama, A. K. G. Eleinen, D. Ghalwash, M. Youssef, and A. F. El-Shiaty,
"Blindness and Visual Impairment among Egyptian Glaucoma Patients.",
Journal of Ophthalmology, vol. 2014, issue 10.1155/2014 Article ID 437548, pp. 3 pages, 2014.