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Corneal topographic and tomographic analysis of normal fellow eyes in unilateral manifest keratoconus patients using Sirius analyzer

Poster Details

First Author: N.Kara TURKEY

Co Author(s):    E. Ozgurhan   T. Kurt   A. Demirok        

Abstract Details

Purpose:

To evaluate topographic and tomographic parameters in fellow eyes in unilateral manifest keratoconus (KCN) patients by comparing them with controls.

Setting:

Department of Ophthalmology, Gaziantep University School of Medicine, Gaziantep, Turkey and Beyoglu Eye Training and Research Hospital, Department of Ophthalmology, Istanbul, Turkey.

Methods:

This retrospective study analyzed fellow eyes of 30 patients with unilateral manifest KCN. The control group included 30 eyes of sex and age matches 30 refractive surgery candidates with normal corneas. Corneal topographic, tomographic and aberrometric parameters measured by Sirius system (Costruzione Strumenti Oftalmici, Florence, Italy). Mean outcome measures were keratometric and pachymetric values, keratoconus screening indices including highest point of ectasia on the anterior and posterior corneal surfaces, the symmetry index of the anterior and posterior curvatures, Baiocchi Calossi Versaci Index front and back, and corneal wavefront aberrations.

Results:

Thinnest corneal thickness, highest point of ectasia on the anterior corneal surface, the symmetry index of the anterior curvature, the symmetry index of the posterior curvature, Z(3,±3) anterior trefoil, Z(4,±2) anterior astigmatism II were statistically different between the fellow eyes of patients with unilateral manifest KCN and control group (p<0.05 for all).

Conclusions:

Normal fellow eyes in unilateral manifest KCN showed differences in several parameters obtained by the Sirius analyzer when compared with control group. However, future longitudinal studies including monitoring of normal eyes of patients with unilateral manifest KCN with topographical and tomographical measurements are required for demonsrate the importance of this study in detection of early corneal alterations in normal fellow eyes of patients with unilateral manifest KCN.

Financial Disclosure:

NONE

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