Abstract
Purpose :
To compare the accuracy of conventional intraocular lens (IOL) formulas and modern ESCRS IOL calculator formulas using refractive prediction error in cataract surgeries
Methods :
This retrospective study included 48 eyes from 48 patients who underwent a routine cataract surgery. The study compared the refractive outcomes predicted by four formulas on IOLmaster700 (Barrett Universal II (BUII), SRK/T, Haigis, and Holladay2) and seven formulas on web-based ESCRS IOL power calculator (BUII, Cooke K6, EVO2.0, Hill-RBF3.0, Hoffer QST, Kane, and Pearl-DGS). Preoperative and postoperative parameters including uncorrected and best-corrected visual acuity, manifest refraction (MR), autorefraction (AR), autokeratometry (ARK), lens tilt, decenteration, and central corneal thickness were also measured. The correlations between the refractive prediction error calculated by each formula and the above-mentioned parameters were analyzed using linear regression models.
Results :
The absolute prediction errors calculated by all formulas were not significantly different at 1-month and 6-month post-op (P=0.585 by AR at 1-month post-op; P=0.361 by MR at 1-month post-op; P=0.207 by AR at 6-month at post-op; P=0.261 by MR at 6-month post-op). The Kane, EVO2.0, and Cooke K6 formulas showed a higher percentage of refractive prediction errors within 0.25 diopters(D) or 0.50D by AR at 6-month post-op (P<0.001 for each circumstance). The Kane formula showed the highest IOL Formula Performance Index (FPI), followed by EVO2.0, BUII (ESCRS calculator and IOLmaster700), Pearl-DGS, Cooke K6, Hoffer QST, and Hill-RBF3.0 by AR at 6-month post-op, while the Cooke K6 formula showed the highest IOL FPI, followed by Pearl-DGS, EVO, Kane, BUII (ESCRS calculator), Hill-RBF3.0, BUII (IOLmaster700), SRK/T, and Holladay by MR at 6-month post-op. The prediction errors calculated by all the formulas were significantly correlated with the mean keratometry values obtained from ARK and IOLmaster700. Additionally, the prediction errors calculated by SRK/T and Haigis had significant correlation with the lens thickness.
Conclusions :
When comparing the accuracy of IOL formulas from the IOLmaster 700 and from the web-based ESCRS IOL power calculator, all of the formulas have comparable prediction accuracy, while the Kane, EVO2.0 and, Cooke K6 formulas have a higher percentage of lower prediction errors.
This abstract was presented at the 2024 ARVO Annual Meeting, held in Seattle, WA, May 5-9, 2024.