PURPOSE: To compare the refractive and astigmatic prediction accuracy among different intraocular lens(IOL) power calculation formulas in patients implanted with aberration-free monofocal toric IOL during cataract surgery.

METHODS: This is a retrospective chart review of consecutive case records of patients who underwent cataract surgery with the implantation of an aberration-free aspheric monofocal toric IOL(enVista toric, MX60T) from February 2022 to November 2023 and had postoperative manifest refraction performed one month after the surgery. Outcome measures included the comparison of spherical equivalent(SEQ-PE) and astigmatic(RA-PE) predicted errors from various IOL power calculation formulas (Abulafia-Koch, Kane's, EVO, Castrop's, Hoffer QST, Hill-RBF, and Barrett toric formula) for the implanted power.(Statistical analysis was performed with Eyetemis Analysis Tool).

RESULTS: 131 eyes(56.5% women, 75.9+9.8 years) were assessed. The absolute RA-PE (accuracy) of the IOL formulas evaluated ranged from 0.35 D to 0.51 D. While the absolute RA-PE was comparable for the four formulas, Castrop's IOL formula showed the worst prediction error with the statistically significant difference in the RA-PE when compared with Barrett, EVO, Hoffer's QST, Kane and Abulafia Koch formulas(all p<0.05). for various formulas the absolute spherical equivalent prediction errorseq-pe was 0.160.22 d. while the evo formula showed the least seq-pe compared to others it was statistically significantly lower when compared with hoffer qst and abulafia-kochboth p="0.005).">

CONCLUSION: The astigmatic prediction accuracy of Abulafia-Koch, Kane, EVO, Hoffer QST, Hill-RBF, and Barrett toric IOL formulas was comparable. The spherical equivalent prediction accuracy of Barrett, EVO, and Kane was comparable, although the EVO formula showed the least prediction error among the various IOL formulas compared.