Central corneal thickness in a Korean population: the Namil Study.

PURPOSE We investigated the distribution of central corneal thickness (CCT), and its association with age, sex, intraocular pressure (IOP), anterior chamber depth (ACD), axial length (AL), and the presence of systemic hypertension and diabetes in a Korean population. METHODS Our study is a population-based glaucoma prevalence study of residents aged ≥40 years in Namil-meon area, located in central South Korea. All subjects underwent a complete ophthalmic examination that included CCT measurement with an ultrasonic pachymeter, ACD and AL measurements by optical biometry, and Goldmann applanation tonometry. The right eye of all subjects was analyzed. RESULTS The mean (SD) CCT of the 1259 right eyes was 530.9 (31.5) μm. In univariate analysis, a thicker CCT was associated with a higher IOP (P < 0.001), a longer AL (P = 0.003), and a younger age (P < 0.001). ACD was not correlated significantly with CCT (P = 0.087). Men had a 5.7 μm higher CCT than women (age adjusted, P = 0.001). Subjects with hypertension had a 4.1 μm lower CCT than those without hypertension (age, sex-adjusted, P = 0.027), and the presence of diabetes was not associated significantly with CCT (age, sex-adjusted, P = 0.892). In multivariate analysis, a higher CCT was associated with a higher IOP (P < 0.001), younger age (P = 0.001), male sex (P = 0.005), and the absence of hypertension (P = 0.018). CONCLUSIONS The mean CCT of a Korean population was 530.9 μm. CCT was associated with IOP, age, sex, and hypertension.