Comparison Of Intraocular Lens Power Calculation Formulas In Highly Myopic Eyes With Extreme Axial Length
Published 2022
- 40th Congress of the ESCRS
Reference: FPM08.06
| Type: Free paper
| DOI:
10.82333/4qnx-8a02
Authors:
Marina Dotti Boada 1
, Vanessa Membrado Camps 1
, Saray Catalán Coronado 1
, Jordi Izquierdo Serra 1
, Xavier Corretger Ruhi* 1
, Marc Figueras Roca 1
1Hospital Clínic de Barcelona,Barcelona,Spain
Purpose
To evaluate refractive outcomes of cataract surgery in eyes with axial length (AL) 30 mm and to assess the
accuracy of intraocular lens (IOL) power calculation formulas.
Setting
clinical practice in a hospital centre
Methods
Retrospective case series analysis of eyes with AL 30 mm that underwent uneventful cataract surgery with
IOL implantation. Comparative analysis of ten IOL formulas: Holladay I, SRK/T, Haigis, modified Wang-Koch AL adjustment formulas (Holladay I-WK, SRK/T-WK and Haigis-WK) and four new generation formulas (Barrett Universal II, Hill RBF 2.0, Kane and Evo 2.0). Refractive predicted error (RPE) was calculated from prediction refraction of each formula and its real postoperative outcome. The mean numerical error (MNE) and mean absolute error (MAE) were determined.
Results
The study comprised 32 eyes. Hill-RBF and Kane formulas showed the closest to zero RPE (0.10 and 0.11 D) whilst SRK/T, Haigis, Holladay 1, Barrett and EVO produced hyperopic RPE (0.43 D, 0.46 D, 0.57 D, 0.36 D, 0.23 D respectively) and modified Wang-Koch AL adjustment formulas induced more myopic RPE (SRK/T-WK 0.15D, Haigis-WK -0.39 D and Holladay-WK -0.85 D). Hill-RBF and Kane formulas presented with lower MAE (0.57 D), followed for EVO formula (0.61 D). Kane and Hill-RBF formulas performed a better refractive predicted precision with approximately 56.25% and 53.13% respectively of the eyes between ± 0.50 D.
Conclusions
New generation formulas deliver very good refractive results in extremely long eyes ( 30 mm). Considering
RPE and MAE, Hill-RBF and Kane approaches show the highest precision.