Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 38 1 2000 03 15 29 35 Siatiri H 2015 09 28 This study was conducted to define the prevalence and types of corneal astigmatism in relation with corneal optical power, axial length, sex and patient age. 641 cataract patients were included in a descriptive study. Complete eye examinations were included in a descriptive study. Complete eye examinations were performed. The data were analysed by standard procedures including analysis of variance, chi square test and multiple linear regression models. With the rule, astigmatism was 55.6% in younger cases and against the rule astigmatism was 55.6% in younger cases and against the rule astigmatism was 43.7% in older cases (P https://acta.tums.ac.ir/index.php/acta/article/view/2159 https://acta.tums.ac.ir/index.php/acta/article/download/2159/2150