CLASSICAL VS. MODERN IOL POWER CALCULATION FORMULAE: IMPACT OF THE ESCRS POWER CALCULATOR ON IOL POWER CHOICE

Published 2025 - 29th ESCRS Winter Meeting

Reference: PP02.01 | Type: Presented Poster & Poster | DOI: 10.82333/bjy8-sf47

Authors: Lisa Tasch ¹ , Leon Pomberger ¹ , Christoph Mayer-Xanthaki ² , Sophia Anna Reifeltshammer* ¹ , Matthias Bolz ¹ , Nino Hirnschall ¹

¹Ophthalmology and Optometry,Johannes Kepler University,Linz,Austria;Ophthalmology and Optometry,Kepler University Clinic,Linz,Austria, ²Ophthalmology,Medical University Graz,Graz,Austria

Purpose

To assess the mean absolute error of classical and modern IOL power calculation formulae in order to evaluate the feasibility of the ESCRS Power Calculator in respect to IOL power choice

Setting

Department of Ophthalmology and Optometry, Johannes Kepler University, Linz, Austria
Department of Ophthalmology and Optometry, Kepler University Clinic, Linz, Austria
Department of Ophthalmology, Medical University Graz, Graz, Austria

Methods

This study included patients that underwent cataract surgery with an implantation of a monofocal IOL (PCB00, Johnson & Johnson, USA). Study examination included optical biometry (IOL Master 700, Carl Zeiss Meditec AG, Germany, Austria), autorefraction and subjective refraction. Next to classical IOL power calculation formulae (Barrett Universal II, Haigis, SRK/T, HofferQ), modern formulae (Barrett Universal II, Cooke K6, EVO, Hill-RBF, Hoffer QST, Kane, Pearl DGS) which are displayed in the ESCRS Power Calculator, were assessed. Manually entered biometry data from the ESCRS Power Calculator was cross-checked by a different examiner. The number of cases in which the use of the ESCRS calculator would lead to the selection of a different IOL power is the subject of discussion.

Results

In total, 337 eyes of 337 patients were included in this trial. The data showed an average axial eye length of 23.43 mm (SD: 1.27) and an average anterior chamber depth of 3.07 mm (SD: 0.40).

The best performing modern formulae were Kane and Barrett Universal II with a mean absolute error (SD) of 0.37 (0.31) and 0.39 (0.32) dpt. The results demonstrated a significant difference between the mean absolute error (MAE) of modern formulae compared to classical formulae with p<0.01. Furthermore, using the ESCRS IOL power calculator saves an average of 5 minutes and 38.2 seconds per patient compared to a separate data input for each modern formula on their website. The total results of 337 eyes will be presented at the ESCRS meeting.

Conclusion

The ESCRS Calculator is a powerful tool and considered beneficial in choice of IOL power.