Posters

Intraocular lens power calculations after LASIK using ray-tracing and anterior–posterior corneal topography data

Poster Details

First Author: Y. Mori JAPAN

Co Author(s):    K. Minami   K. Miyata   Y. Iida   K. Kamiya   N. Shoji   K. Shimizu     

Abstract Details

Purpose:

To examine the efficacy of ray tracing and anterior and posterior corneal topography data on intraocular lens (IOL) power calculations after laser in situ keratomileusis (LASIK).

Setting:

Department of Ophthalmology, Kitasato University, Kanagawa, Japan and Miyata Eye Hospital, Miyazaki, Japan.

Methods:

Fifty-one eyes from 35 patients who had previously received myopic LASIK underwent cataract surgery with IOL implantation. Preoperatively, anterior and posterior corneal topography was measured with a rotating Scheimpflug photographer. Refractive errors 1 month after surgery were calculated based on the use of ray-tracing calculations with anterior-posterior topography and were compared to those obtained with the SRK/T, double-K, Higis-L, and Shammas-PL methods. The influence of the posterior corneal curvature was also evaluated.

Results:

The mean refractive error was -0.05±0.54 (SD) D, and 63 and 94% of eyes were within ± 0.5 and 1.0 D errors, respectively. The SRK/T and double-K were significantly larger (P<0.009, the Holm multiple comparison), whereas no difference was found with the Haigis-L and Shammas-PL. No significant association was observed although the other methods showed significant correlations with the posterior curvatures (P<0.05, Pearson’s correlation).

Conclusions:

Ray-tracing calculations combined with anterior and posterior corneal topography were effective for IOL power calculations for eyes after LASIK with the least influence of posterior corneal curvature.

Financial Disclosure:

NONE