The Prevalence and Causes of Visaual Impairment and Blindness in a Rural Population in the North of Iran - HASHEMI, Hassan; REZVAN, Farhad; YEKTA, AbbasAli; OSTADIMOGHADDAM, Hadi; SOROUSH, Sara; DADBIN, Nooshin; KHABAZKHOOB, Mehdi (Iranian Journal of Public Health, 2015)