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Purpose:  To determine the mean corneal power, astigmatism, and irregularity in a sample from the population of Tehran.

Materials and methods:  Four hundred and forty‐two people residing in the first four municipality districts of Tehran were selected through a random stratified cluster sampling approach, 410 of which met the inclusion criteria and were enrolled in the study to have Orbscan II acquisitions between 9:00 am and 7:00 pm. The values obtained for keratometry, corneal astigmatism, and corneal irregularity were studied.

Results:  The mean keratometry reading was 44.39 diopter (D) [95% confidence interval (CI): 44.22–44.57]. Age, spherical equivalent and corneal diameter were significantly correlated with mean keratometry reading in the multivariate model. Mean corneal astigmatism was 0.98 D (95% CI: 0.89–1.06), also significantly correlated with spherical equivalent in the multivariate …