N. Aprioku, Ibifubara, and Elizabeth A. Awoyesuku. “Pattern and Prevalence of Color Vision Disorders Amongst Secondary School Students in Rivers State, Nigeria”. Ophthalmology Research: An International Journal 10, no. 4 (August 21, 2019): 1-7. Accessed September 23, 2021. https://journalor.com/index.php/OR/article/view/30110.