Effects Of Anterior-Posterior Corneal Radius Ratio On Intraocular Lens Power After Laser Correction Of Myopia According To Axial Length

To evaluate the actual anterior-posterior (AP) corneal radius ratio after previous laser correction for myopia (M-LVC) according to axial length (AL) and investigate the impact of the AP ratio and AL on the absolute prediction error (APE) in cataract surgery.

This study combined retrospectively collected biometry data exported from swept-source optical coherence tomography between January 2018 and October 2021—1,018 eyes with a history of M-LVC and 19,841 control eyes— with biometry data from 39 eyes that underwent cataract surgery after M-LVC.

The AP ratio and ophthalmic biometric parameters were evaluated according to AL. The APE of Haigis-L, Barrett True-K, and Barrett True-K with total keratometry (Barrett True-TK) in 39 eyes were compared according to AL.

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. The APE was significantly lower in the Barrett True-TK than in the Haigis-L formula on eyes with AL of 26–28 mm and on eyes with AL above 28 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 eyes with previous M-LVC, AP ratio increases with AL. We recommend Barrett True-TK formula, especially in high myopic eyes with AL above 26 mm.