Intraocular lens power calculation in myopic eyes undergoing bilensectomy: analysis of comparability and accuracy.

PURPOSE: To address the calculation of intraocular lens (IOL) power in myopic eyes undergoing simultaneous anterior or posterior chamber phakic IOL (pIOL) explantation and lens extraction surgery, a procedure known as bilensectomy, in comparison with myopic eyes without pIOL (controls).

DESIGN

Retrospective analysis of comparability and accuracy.

SETTING

Department of Ophthalmology, Goethe-University, Frankfurt, Germany.

METHODS

IOLMaster 700 and Pentacam AXL were used for biometry. IOL power was calculated using the Barrett Universal II (BUII), Cooke K6, Hoffer-QST, Emmetropia Verifying Optical Formula v2.0 (EVO 2.0), Prediction Enhanced by Artificial Intelligence and output Linearization-Debellemaniere, Gatinel, and Saad (PEARL-DGS), Hill-Radial Basis Function (Hill-RBF), and Kane formulas included in the ESCRS online calculator, as well as the T2 and Ladas super formula and the SRK/T and Holladay 1 with or without Wang-Koch axial length (AL) adjustment.

RESULTS

60 eyes (mean AL: 29.1 ± 2.06 mm) of 60 patients (mean age 57.4 ± 10.9 years) were included. 30 eyes underwent bilensectomy, and 30 served as controls. In bilensectomy eyes, Kane (0.53 diopter [D]), PEARL-DGS (0.56 D), and Hill-RBF (0.61 D) demonstrated the lowest root-mean square of the absolute error. PEARL-DGS demonstrated the highest percentage of eyes within ±0.25 D (46.7%), followed by BUII, Hill-RBF, and Kane (40.0%, each). EVO 2.0 showed a significant difference ( P = .001) in mean prediction error between the bilensectomy group and the control group. All other formulas showed no significant differences between the 2 groups (each P > .05).

CONCLUSIONS

Simultaneous explantation of a pIOL does not seem to exert a considerable impact on the IOL power calculation in myopic eyes. The performance of the formulas is comparable with myopic eyes without pIOLs.