Comparison of the Barrett toric calculator using measured and predicted posterior corneal astigmatism and the Kane and Abulafia-Koch calculators

Olga Reitblat, Megiddo Barnir, Ayat Qassoom, Adi Levy, Ehud I. Assia, Guy Kleinmann*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose:To compare the accuracy of the Barrett toric calculator with measured and predicted posterior corneal astigmatism (MPCA and PPCA, respectively), the Abulafia-Koch (AK) formula, and the toric Kane formula.Setting:Ein-Tal Eye Center, Tel-Aviv, Israel.Design:Retrospective cohort.Methods:Consecutive cases of patients who underwent uneventful cataract extraction surgery with implantation of a toric intraocular lens between March 2015 and July 2019 were retrospectively reviewed. 1 eligible eye from each patient was included. The predicted postoperative refractive astigmatism was calculated using each method and compared with the postoperative refractive astigmatism to give the prediction error.Results:80 eyes of 80 patients were included in this study. The mean centroid and the mean and median absolute prediction errors using Kane (0.25 diopters [D] ± 0.54 @ 6 degrees, 0.50 D ± 0.31 and 0.45 D, respectively) were significantly different compared with MPCA (0.12 D ± 0.52 @ 16 degrees, P <.001,.44 D ± 0.28 and 0.36 D, P =.027, respectively), PPCA (0.09 D ± 0.49 @ 12 degrees, P <.001,.41 D ± 0.27 and 0.35 D, P <.001, respectively), and AK (0.11 D ± 0.49 @ 11 degrees, P <.001,.42 D ± 0.27 and 0.35 D, P =.004, respectively). No significant differences were found between the calculators in the predictability rates within ±0.25 D, ±0.50 D, ±0.75 D, and ±1.00 D.Conclusions:The measured posterior corneal curvature in the Barrett calculator yielded comparable outcomes to its prediction by the Barrett and AK formulas. The Kane calculator showed a slight against-the-rule prediction error compared with the other methods, resulting in a small higher median absolute error with marginal clinical importance.

Original languageEnglish
Pages (from-to)704-710
Number of pages7
JournalJournal of Cataract and Refractive Surgery
Volume49
Issue number7
DOIs
StatePublished - 1 Jul 2023

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