Abstract:AIM: To compare the differences and the relationships of central corneal thickness(CCT)measurements among optical coherence tomography(OCT), Tomey pachymetry and ultrasound pachymetry after laser assisted subepithelial keratomileusis(LASEK).
METHODS:Forty-nine patients(96 eyes)with myopia after 6mo of LASEK were assigned to measure the CCT by OCT, Tomey pachymetry and ultrasound pachymetry. Paired t-test and Pearson correlation analysis was used for statistical analysis.
RESULTS: The mean CCT measured by OCT, Tomey pachymetry and ultrasound pachymetry was(475.15±33.67μm),(447.80±34.11μm),(465.18±34.23μm), respectively. Surgery reserved mean CCT was(431.22±35.32)μm. There were statistically differences between two comparative measured results(P<0.05). Ultrasound pachymetry had a positive correlation with OCT and Tomey pachymetry(P<0.01), and the correlation coefficient was 0.949 and 0.983, respectively. The actual CCT of 6mo post-operation was thicker than surgery reserved CCT.
CONCLUSION: The CCT measurements of three instruments were not interchangeable.
