The Prevalence of Anisometropia in patients examined in Optometry clinic of Rehabilitation Faculty of Shahid Beheshti Medical University

Anisometropia is considered to be a causative factor in the pathogenesis of amblyopia and strabismus. This study aimed to determine the prevalence of anisometropia in patients examined in optometry clinic of Faculty of Rehabilitation of Shahid Beheshti Medical University from March 2008 to March 2009 In this cross sectional study, 600 files of patients examined in the optometry clinic of Rehabilitation Faculty of Shahid Beheshti Medical University in year 2008 / 2009 were analyzed. Variables included age, sex, anisometropia, type and amount of refractive error and eye health of anterior and posterior segment. Anisometropia was defined as spherical equivalent (SE) refraction difference 1.00D or more between two eyes. The prevalence of anisometropia was 12.5 %(75 of 600patients). Out of 75 anisometropic patients, 40 were male (53.3%) and 35 were female (46.6%). From 75 anisometropic patients, 13.3 % (10 of 75) were amblyopic, 1.3% (1 of 75) was esotropia and 1.3% (1 of 75) was exotropia. The highest frequency of anisometropia was in age groups of 10-20 and 50-60 old years. The frequency of antimetropic anisometropia, anisoastigmatism, isomyopic and isohypermetropic were 33.3%, 46.7%, 13.3% and 6.7%, respectively. The results of this research showed that anisometropia results in Amblyopia in the different age groups which were in accordance with previous studies.