To determine the distribution of anterior eye biometry indices, such as keratometry pachymetry, anterior chamber depth, pupil diameter, and corneal diameter, as determined by Orbscan measures in a young Iranian population

A cross-sectional study was conducted and subjects were selected through multistage cluster sampling from amongst the students of Mashhad University of Medical Sciences. Objective and subjective refraction were performed followed by Orbscan imaging

A total of 1330 subjects were selected of which 1121 participated in the study. After applying the exclusion criteria the final analysis was performed on the data of 1051 subjects. The mean age of the participants was 26.1±3.2 years (19-34 years old). The mean and 95% confidence interval (CI) of maximum keratometry, minimum keratometry, pupil diameter, corneal diameter, anterior chamber depth, and central corneal thickness was 44.5±1.7(44.4-44.6), 43.1±1.6(43.0-43.2), 4.3±0.9(4.3-4.4), 11.7±0.4(11.7-11.7), 3.7±0.3(3.6-3.7) and 550.5±35 (548.4-552.6), respectively. After adjusting for age and the mean spherical equivalent (MSE) it was noted that maximum keratometry, minimum keratometry, central corneal thickness, and the thinnest pachymetry were higher in female subjects whilst the corneal diameter and anterior chamber depth were higher in male subjects. The corneal diameter and anterior chamber depth showed significant changes with age. The MSE was only correlated with maximum keratometry and anterior chamber depth

The insignificant changes of the corneal diameter and anterior chamber depth with age and the differences between males and females in the evaluated indices should be considered in refractive surgery