Actual anterior-posterior corneal radius ratio in eyes with prior myopic laser vision correction according to axial length

Abstract

Abstract We retrospectively evaluate the actual anterior-posterior (AP) corneal radius ratio in eyes with previous laser correction for myopia (M-LVC) according to axial length (AL) using biometry data exported from swept-source optical coherence tomography between January 2018 and October 2021 in a tertiary hospital (1,018 eyes with a history of M-LVC and 19,841 control eyes). The AP ratio was significantly higher in the LVC group than in the control group. Further, it was significantly positively correlated with AL in the LVC group. We also investigated the impact of the AP ratio and AL on the absolute prediction error (APE) in 39 eyes that underwent cataract surgery after M-LVC. The APE was significantly lower in the Barrett True-K with total keratometry (Barrett True-TK) than in the Haigis-L formula on eyes with AL above 26 mm. In eyes with AL of 26–28 mm, the percentage of prediction error within ± 1 D for Barrett True-TK and Barrett True-K was significantly higher than that for Haigis-L. In conclusion, in eyes with previous M-LVC, AP ratio increases with AL. The Barrett True-K or Barrett True-TK formulas are recommended rather than Haigis-L formula in M-LVC eyes longer than 26 mm.