Accuracy Of Intraocular Lens Calculation Formulas For The Four-Flanged Fixation Technique In Eyes With No Capsular Support

Published 2022 - 40th Congress of the ESCRS

Reference: FPS05.12 | Type: Free paper | DOI: 10.82333/e1rt-xv09

Authors: Biana Dubinsky Pertzov ¹ , Ori Mahler ² , Idan Hecht* ³ , Asaf Shemer ¹ , Inbal Gazit ¹ , Lior Or ¹ , Eran Pras ¹ , Adi Einan-Lifshitz ¹

¹Ophthalmology,Shamir Medical Center,Zriffin,Israel;Tel-Aviv University,Tel-Aviv,Israel, ²Ophthalmology,Shamir Medical Center,Zrifiin,Israel, ³Ophthalmology,Shamir Medical Center,Zrifiin,Israel;Tel-Aviv University,Tel-Aviv,Israel

Purpose

To assess the refractive prediction error of the intraocular lens (IOL) calculation formulas in eyes that have undergone scleral fixation using the four-flanged technique

Setting

Ophthalmology Department, Shamir Medical Center, Israel

Methods

Retrospective case series of patients who underwent scleral fixation using the four-flanged fixation technique in the Shamir Medical Center between June 2020 to October 2021. The refractive prediction errors for four IOL prediction formulas - Barrett Universal II, Holladay 1, Kane and SRK/T formulas - were obtained by subtracting the predicted spherical equivalent from the postoperative spherical equivalent. The arithmetic mean refractive prediction error and mean absolute error were calculated and compared.

Results

Twenty-three eyes of 23 patients were included. Akreos AO60 (Bausch & Lomb, Inc.) IOL was implanted in 13 eyes and BunnyLens HP (Hanita Lenses, Israel) in 10 eyes. Mean age was 72.84±13.2 years. All formulas produced myopic mean arithmetic refractive prediction error. Mean arithmetic refractive prediction errors were -0.37 D for Holladay 1, -0.46 D for Barrett Universal II, -0.46 D for SRK/T, and -0.69 D for Kane formulas. Mean absolute error values were 0.48 D for Holladay 1, 0.58 D for Barrett Universal II, 0.59 D for SRK/T, and 0.80 D for Kane formulas. There were no statistically significant differences in prediction errors between the four formulas.

Conclusions

Refractive outcomes of the four-flanged fixation technique produced myopic values compared to the prediction for all formulas tested. This finding suggests that the effective lens position is more anterior than in-the-bag IOL implantation.