All data were analysed using SPSS software. Independent t-test was used to compare the groups. The correlation between choroidal thickness and other variables (age, axial length, vertical c/d, RNFL thickness, MD) was evaluated using Pearson correlation analysis.Repeatability analysis of study parameters measured with Cirrus 4000 HD OCT was evaluated using the coefficient of variation (CV). For CV calculation of choroidal thickness measured by Cirrus 4000 HD OCT, 10 consequential measurements were obtained by the same operator to the same eye of the subject. CV is defined as the ratio of the standard deviation to the mean: cV=σ/μ