Classical Vs. Modern Iol Power Calculation Formulae: The Escrs Power Calculator's Impact On Iol Power Choiol
Published 2024
- 42nd Congress of the ESCRS
Reference: FP06.04
| Type: Free paper
| DOI:
10.82333/n6ee-fg26
Authors:
Lisa Tasch* 1
, Leon Pomberger 1
, Christoph Mayer-Xanthaki 2
, Sophia 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 assess the relevance of the ESCRS Power Calculator in respect to IOL power choice
Setting
Ophthalmology and Optometry, Johannes Kepler University, Linz, Austria
Ophthalmology and Optometry, Kepler University Clinic, Linz, Austria
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 (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. Main outcome was the percentage of eyes which would have received a different IOL power due to the use of the ESCRS Calculator.
Results
In total, 400 eyes of 400 patients were included in this trial. The preliminary data showed an average axial eye length of 23.22 mm (SD: 0.96) and an average anterior chamber depth of 2.99 mm (SD: 0.23). After constant optimisation for each IOL power calculation formula the mean absolute refractive error (MAE) was found to be 0.32 D (SD: 0.27). Furthermore, in 30% of these cases the use of the ESCRS Power calculator would have changed the choice of IOL power. In 20% of the eyes a deviation of at least 1.0 D was observed between the formulae and in 40% of the cases a deviation of at least 0.5 D was observed between formulae. The results for the total of 400 will be presented at the ESCRS meeting.
Conclusions
The ESCRS Calculator is a powerful tool and considered beneficial in choice of IOL power.