To determine the normal distribution of corneal diameter in a 40-60 year old population and its association with other biometric components

In a cross-sectional population-based study, subjects were selected through multistage cluster sampling from the 40-64 year old citizens of Shahroud in the North of Iran. After obtaining informed consents, optometry tests including refraction and visual acuity and ophthalmic exams including slit lamp exams and retinoscopy were done for all participants. Biometric components and white-to-white (WTW) corneal diameter were measured with the LENSTAR/BioGraph

Of the 6311 invitees, 5190 people (82.2%) participated in the study. After applying exclusion criteria, analysis was done on data from 4787 people. Mean WTW corneal diameter in this study was 11.80mm (confidence interval: 11.78-11.81), and based on two standard deviations from the mean, the normal range for this index was from 10.8 to 12.8mm. WTW corneal diameter strongly correlated with corneal radius of curvature (r=0.422) and axial length (r=0.384). According to multiple linear regression, lower age, thinner cornea, longer AL, thicker lens, and flatter cornea were significantly related to higher WTW corneal diameter. Spherical equivalent significantly increased at higher corneal diameters hyperopic shift

The average and normal range of corneal diameter, as measured with the BioGraph, is studied in an Iranian population for the first time. The corneal diameter strongly correlates with AL and radius of curvature. WTW is larger at younger ages