Prediction accuracy of conventional and total keratometry for intraocular lens power calculation in femtosecond laser-assisted cataract surgery

Soyoung Ryu,Kyoung Yul Seo,Ikhyun Jun,Tae-Im Kim,Eung Kweon Kim

doi:10.1038/s41598-021-92354-1

Soyoung Ryu, Kyoung Yul Seo + Show 3 more

Open Access

https://doi.org/10.1038/s41598-021-92354-1

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Journal: Scientific Reports	Publication Date: Jun 18, 2021
Citations: 8	License type: open-access

Affiliation: Yonsei University

Abstract

This study evaluated the accuracy of total keratometry (TK) and standard keratometry (K) for intraocular lens (IOL) power calculation in eyes treated with femtosecond laser-assisted cataract surgery. The retrospective study included a retrospective analysis of data from 62 patients (91 eyes) who underwent uneventful femtosecond laser-assisted cataract surgery with Artis PL E (Cristalens Industrie, Lannion, France) IOL implantation by a single surgeon between May 2020 and December 2020 in Severance Hospital, Seoul, South Korea. The new IOLMaster 700 biometry device (Carl Zeiss Meditec, Jena, Germany) was used to calculate TK and K. The mean absolute error (MAE), median absolute error (MedAE), and the percentages of eyes within prediction errors of ± 0.25 D, ± 0.50 D, and ± 1.00 D were calculated for all IOL formulas (SRK/T, Hoffer-Q, Haigis, Holladay 1, Holladay 2, and Barrett Universal II). There was strong agreement between K and TK (intraclass correlation coefficient = 0.99), with a mean difference of 0.04 D. For all formulas, MAE tended to be lower for TK than for K, and relatively lower MAE and MedAE values were observed for SRK/T and Holladay 1. Furthermore, for all formulas, a greater proportion of eyes fell within ± 0.25 D of the predicted postoperative spherical equivalent range in the TK group than in the K group. However, differences in MAEs, MedAEs, and percentages of eyes within the above prediction errors were not statistically significant. In conclusion, TK and K exhibit comparable performance for refractive prediction in eyes undergoing femtosecond laser-assisted cataract surgery.

Highlights

This study evaluated the accuracy of total keratometry (TK) and standard keratometry (K) for intraocular lens (IOL) power calculation in eyes treated with femtosecond laser-assisted cataract surgery
Depending on the device used to measure posterior corneal astigmatism, the use of total corneal power has been associated with varying outcomes in patients undergoing uncomplicated cataract surgery[18]
Recent studies have demonstrated improvements in refractive outcomes using “total keratometry” values derived from IOLMaster 700, an swept-source optical coherence tomography (SS-OCT)-type optical biometry device for IOL calculation

Summary

Introduction

This study evaluated the accuracy of total keratometry (TK) and standard keratometry (K) for intraocular lens (IOL) power calculation in eyes treated with femtosecond laser-assisted cataract surgery. Recent studies have debated the addition of accurate posterior corneal measurements to formulas for calculating IOL in patients undergoing cataract s urgery[2,3]. Some studies have reported better refractive outcomes for conventional monofocal IOL implantation when accurate posterior corneal data are used to calculate TK values, whereas few other studies did not show any benefits of TK over K 2,4,8–10. There is a paucity of data evaluating refractive outcomes using TK values in patients undergoing femtosecond laser-assisted cataract surgery. With the growing popularity, there is a need to evaluate the benefit of using TK for IOL power calculation in patients undergoing femtosecond laser-assisted cataract surgery

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