Predictive Accuracy Of Intraocular Lens Power Formulas Calculated By Preoperative Axial Length Measurements Based On Multiple Refractive Indices In Normal And High Myopia
Published 2024 - 42nd Congress of the ESCRS
Reference: FP06.02 | Type: Free paper | DOI: 10.82333/vaaa-s189
Authors: Yeo Kyoung Won* 1 , Young-Sik Yoo 2 , Won Seok Song 1 , Han Ul Kim 1 , Junkyu Chung 1 , Hee-jee Yun 1 , Tae-young Chung 3 , Dong Hui Lim 1 , Jisang Han 4
1Ophthalmology,Samsung medical center,Seoul,Korea, Republic Of, 2Ophthalmology,IU Eye Clinic,Seoul,Korea, Republic Of, 3Ophthalmology,Renew Seoul Eye Center,Seoul,Korea, Republic Of, 4Department of Ophthalmology,Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine,Seoul,Korea, Republic Of
Purpose
To analyze the predictive accuracy of the SRK/T, Haigis, BUII, Kane, and EVO intraocular lens (IOL) power formula in normal axial length (AL) and long AL group using ARGOS (Alcon, Fort Worth, TX, USA) which is an ocular biometry device that uses the specific refractive indices of each segment of eye based on swept source optical coherence tomography (SS-OCT).
Setting
Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
Methods
We performed a retrospective review of patients who had uneventful cataract surgery with an Acrysof IQ SN60WF IOL (Alcon Laboratories, Inc.) implantation from Jan. 2020 and Dec. 2021 at Samsung Medical Center. Biometry was obtained with ARGOS and patients were separated into subgroups based on AL as follows: normal (22.5 < AL < 26.0 mm) and long (AL ≥ 26.0 mm). We calculated the mean error (ME), the mean of all prediction errors (PE) of formula between actual postoperative 1 month spherical equivalent (SE) and formula-predicted SE based on the implanted IOL power. Outcomes included the mean absolute error (MAE), the median absolute error (MedAE), and the proportion of eyes within ±0.25, ±0.50, and ±1.00 diopter (D) of PE for each formula.
Results
In total, 237 eyes of 187 patients were included in this retrospective study and divided into two groups according to axial length; 197 eyes of 158 patients in normal AL group, and 40 eyes of 29 patients in long AL group. In normal AL group, the most accurate formula was EVO formula, which showed the lowest MAE (0.30D) and MedAE (0.225D). In addition, in accuracy within ± 0.25D and ± 0.5D, EVO formula tended to show the highest percentage of eyes between the formulas, followed by Kane and SRK/T formula. Like the normal AL group, the MAE and MedAE of EVO formula were the lowest in the long AL group and EVO formula showed highest percentage of eyes within these predicted targets than the other formulas.
Conclusions
When using ARGOS, which measures AL more accurately by considering the specific refractive index of each segment of eye based on SS-OCT, EVO formula had the lowest MedAE and highest proportion of eyes within ±0.25, ±0.50, and ±1.00 D of the predicted target in both normal AL and long AL.