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Analysis of surgically-induced astigmatism on the posterior surface of the cornea

Poster Details

First Author: G.Nemeth HUNGARY

Co Author(s):    Z. Hassan   A. Lipecz   L. Modis Jr              

Abstract Details

Purpose:

To measure surgically induced astigmatism (SIA) on the posterior surface of the cornea using Scheimpflug-based keratometry on eyes with with-the-rule corneal astigmatism.

Setting:

Department of Ophthalmology, University of Debrecen and Orbi-Dent Health and Laser Center, Debrecen, Hungary

Methods:

Scheimpflug-based keratometry was obtained preoperatively and a minimum of 10 weeks after cataract surgery performed via superior clear corneal incisions. Inclusion criteria was patients with with-the-rule corneal astigmatism. The surgically induced astigmatism (SIA) based on the keratometric values were determined on the anterior and posterior surfaces separately and the data were analyzed.

Results:

Our study included 101 eyes of 101 patients (age range: 46.4-87.5 years) with with-the-rule corneal astigmatism. Preoperatively, the magnitude of corneal astigmatism measured on the anterior surface was 0.83±0.63 D and it was 0.32±0.19 D for the posterior corneal astigmatism, which was greater than 0.5 D in 11.9%. The SIA was 0.61±0.53 D measured on the anterior corneal surface and was 0.31±0.49 D on the posterior surface, which was 0.5 D or greater in 20%. The correlation was not significant between magnitude and orientation of SIA on the anterior and posterior surfaces (r=0.17;p=0.1).

Conclusions:

The SIA on the posterior surface of the cornea may have a clinically significant role, especially in cases of toric intraocular lens implantation. The correlation between magnitude and orientation of SIA vectors of the anterior and posterior surfaces were not significant. The SIA measured on the posterior corneal surface may have a significant clinical impact on more precise planning of cataract surgeries.

Financial Disclosure:

NONE

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