Use of the posterior/anterior corneal curvature radii ratio on intraocular lens power calculation in patients with prior myopic laser vision correction

Session Details

Session Title: Presented Poster Session: Intraocular Refractive Surgery

Venue: Poster Village: Pod 2

First Author: : Y.Eom SOUTH KOREA

Co Author(s): :    H. Kim   J. Huh   S. Choi   S. Baek   J. Kim   J. Song        

Abstract Details

Purpose:

To investigate the accuracy of intraocular lens (IOL) power calculation using the posterior/anterior corneal curvature radii ratio in patients undergoing cataract surgery after myopic refractive surgery.

Setting:

Retrospective cross sectional study

Methods:

Seventy eyes of 70 cataract patients who underwent phacoemulsification surgery were enrolled. Adjusted corneal power of cataract patients was calculated using the keratometry measured by IOLMaster 500 and anterior and posterior corneal curvature radii measured by single Scheimpflug camera. Modified Wang-Koch adjustment was used to obtain adjusted axial length for IOL power calculation. The median absolute error (MedAE) based on the adjusted corneal power and axial length in the Haigis formula was compared with that based on conventional K in the Shammas, Haigis-K, and Barrett true K formulae.

Results:

The MedAE based on adjusted corneal power and axial length in the Haigis formula (0.33 D) was significantly smaller than that based on conventional K in the Shammas (0.72 D), Haigis-L (0.45 D), and Barrett true K (0.53 D) (P < 0.00, P = 0.004, and P < 0.001, respectively). The percentage of eyes with refractive prediction error within ± 0.50 D calculated using adjusted corneal power and axial length in the Haigis formula was also significantly greater than that obtained using conventional K in the Shammas, Haigis-K, and Barrett true K formulae.

Conclusions:

IOL power calculation using adjusted corneal power according to the posterior/anterior corneal curvature radii ratio and adjusted axial length provided more accurate refractive outcomes than calculation using conventional K in eyes with prior myopic laser vision correction.

Financial Disclosure:

None