Abstract
Purpose:
To compare the predictive accuracy of 4 toric intraocular lens (IOL) formulas (Barrett, EVO, Hoffer QST, and Kane) integrated in the ESCRS calculator. Barrett and EVO were tested with measured (Barrett M and EVO M) and predicted (Barrett P and EVO P) posterior corneal curvature.
Setting:
Multiple surgical centers in the United States.
Design:
Retrospective database study.
Methods:
6753 eyes implanted with nontoric IOLs were analyzed. Preoperative biometry, including posterior corneal curvature, was obtained using the IOLMaster 700. Predicted residual astigmatism was calculated through the proprietary websites of the 4 toric formulas integrated into the ESCRS IOL power calculator. Primary endpoints were the mean vector magnitude error and proportions of eyes with vector magnitude prediction errors ≤0.50 diopters (D).
Results:
Kane demonstrated the lowest mean vector magnitude prediction error (0.537 D), significantly lower than EVO P (0.561 D), EVO M (0.57 D), Barrett M (0.579 D), Barrett P (0.583 D), and Hoffer QST (0.622 D) (all
P
P
P
Conclusions:
The Kane formula showed statistically superior predictive accuracy with the lowest errors and variances and the highest proportion of eyes within 0.50 D. However, differences among formulas were small, and their clinical relevance for toric IOL outcomes remains uncertain.