Kassa T, Alene GD. Prevalence of refractive errors in pre-school and school children of Debark and Kola Diba towns, North-western Ethiopia. ejhd [Internet]. 2004 Mar. 25 [cited 2026 Oct. 25];17(2):117-24. Available from: https://www.ajol.info/index.php/ejhd/article/view/9852