The Prevalence of Strabismus in 7-Year-Old Schoolchildren in Iran

Purpose: To determine the prevalence of tropia and phoria in Iran and their association with some related factors.Methods: In a cross-sectional population-based study, multistage randomized cluster sampling was used to select participants from among grade 1 students in the primary schools of 7 cities of Iran. After obtaining their parents’ approval, the students underwent the measurement of uncorrected and corrected visual acuity, cycloplegic...