ESCRS - PO0419 - Intraocular Lens Power Calculation In Eyes With Prior Myopic Laser Vision Correction Using Lenstar Ls 900 Biometry And Iol Calculator On Ascrs Website

Intraocular Lens Power Calculation In Eyes With Prior Myopic Laser Vision Correction Using Lenstar Ls 900 Biometry And Iol Calculator On Ascrs Website

Published 2023 - 41st Congress of the ESCRS

Reference: PO0419 | Type: Free paper | DOI: 10.82333/y63w-3h16

Authors: Vicky Shen* 1 , Jia-Kang Wang 1 , Yi-Ching Chu 1

1FEMH,New Taipei City,Taiwan, Province of China

Purpose

To investigate the accuracy of 3 intraocular lens (IOL) power calculation formulas in predicting refractive outcome in eyes with prior myopic laser vision correction (LVC).

Setting

Department of Ophthalmology, Far Eastern Memorial Hospital, New Taipei City, Taiwan

Methods

Twenty eyes of 20 patients which received prior myopic LVC, was measured by the Lenstar LS900 (Haag-Streit, USA) biometry and IOL power was calculated by the IOL calculator on the ASCRS website. All the patients underwent uneventful 2.2-mm corneal wound phacoemulsification and IOL in-the-bag placement by one surgeon (Wang JK). Three IOL calculation formulas were utilized: Shammas, Haigis-L, and Barrett true K. The numerical error was calculated as the difference between the postoperative refraction and the refraction predicted by each formula. Both the mean absolute error (MAE) and median absolute error were calculated to compare the performance of 3 different formulas.

Results

After statistical comparison of the MAE produced by 3 formulas, there was no significant difference (p > 0.05). However, the MAE created by the Barrertt true K formula was significantly lower than the other 2 formulas after pair comparison. The MAE between Shammas and Haigis-L formulas was comparable. The prediction errors within ±0.5 D and within ±1.0 D all fit the benchmark standards.
 

Conclusions

The postoperative refractive results were within the benchmark standards using these 3 formulas. Barrett true K formula possibly performed better in predicting IOL power in eyes with prior myopic LVC.