ESCRS - P046 - SHORT EYES: INTRAOCULAR LENS POWER FORMULA ACCURACY - COMPARISON OF 14 FORMULAS

SHORT EYES: INTRAOCULAR LENS POWER FORMULA ACCURACY - COMPARISON OF 14 FORMULAS

Published 2022 - 26th ESCRS Winter Meeting

Reference: P046 | Type: Abstracts | DOI: 10.82333/0g21-xb43

Authors: Diogo Maleita* 1 , Rita Serras-Pereira 1 , Miguel Vieira 1 , Catarina Xavier 1 , Bruna Cunha 1 , Pedro Gil 1 , Nuno Alves 1 , Diogo Hipólito-Fernandes 1

1Ophthalmology,Centro Hospitalar Universitário Lisboa Central,Lisboa,Portugal

Purpose

The aim of this study is to compare the accuracy of 14 IOL power formulas predicting refractive error in short eyes (AL ≤ 22.0mm).

Setting

Ophthalmology Department, Centro Hospitalar Universitário de Lisboa Central, Lisbon, Portugal

Methods

Retrospective case-series, including patients submitted to uneventful age-related cataract surgery over the last 5 years with a single spherical monofocal IOL model implantation. Preoperative biometric data were obtained through LenStar 900. Using optimized constants for the whole range of AL, refraction prediction errors was calculated for: Barret Universal II (BUII), Castrop, Cooke K4, Emmetropia Verifying Optical (EVO 2.0), Haigis, HofferQ, Holladay 1, Kane, Naeser 2, Olsen, SRK/T, T2, VRF and VRF-G. Mean prediction error (PE) and its standard deviation (SD), the median absolute error (MedAE), the mean absolute error (MAE) and the percentages of eyes with PE within ±0.25, ±0.50 and ±1.00 diopters (D) were evaluated.

Results

A total of 318 eyes from 318 patients were included. Mean axial length was 21.61 ± 0.35mm (range 20.40 - 21.99mm).  Analysis of the absolute PE revealed statistically significant differences (p < 0.001) between the formulas analyzed. The lowest absolute errors were obtained with VRF-G, Kane, Olsen and Cooke K4 formulas. There was also a statistically significant difference between percentages of eyes within ±0.50D (p<0.001). The only formula obtaining a percentage of eyes within ±0.50D >75% was the Kane formula (75.2%).

Conclusion

New generation formulas, particularly VRF-G, Kane, Olsen and Cooke K4 formulas, seem to be reliable and accurate in eyes with AL ≤ 22.0mm.