The prevalence of refractive errors and its determinants in the elderly population of Mashhad, Iran.
Yekta AA, Fotouhi A, Khabazkhoob M, Hashemi H, Ostadimoghaddam H, Heravian J, Mehravaran S. The prevalence of refractive errors and its determinants in the elderly population of Mashhad, Iran. Ophthalmic Epidemiol. 2009 May-Jun; 16(3):198-203.