Astigmatism Clinical Trial
Official title:
Comparison of Corneal Epithelial and Stromal Thickness Distributions Between Eyes With Keratoconus and Healthy Eyes With Corneal Astigmatism >2.0 D
The purpose of the study was to identify corneal epithelial- and stromal-thickness
distribution patterns in keratoconic eyes using spectral-domain-optical coherence tomography
(SD-OCT).
Study Hypothesis: SD-OCT provides necessary details about the distribution of corneal
epithelial and stromal thicknesses for identification of a pattern characteristic for early
keratoconus.
Purpose of the study: To characterize epithelial and stromal thickness distribution in
keratoconic eyes and to develop epithelial and stromal thickness-based variables for
keratoconus detection.
Methodology: SD-OCT corneal scans of 20 eyes with keratoconus (group 1) and 20 healthy eyes
with > 2 diopters (D) of corneal astigmatism as controls (group 2) are studied. Keratoconus
patients referred to the Eye Dpt. of the University Hospital North Norway for CXL (Corneal
collagen cross-linking)- treatment and healthy subjects seeking preoperative evaluation for
refractive surgery at SynsLaser® Kirurgi AS Tromsø clinic are examined by corneal SD-OCT as a
part of their routine examination. Analysis of their SD-OCT corneal scans is used for the
purpose of this study.Two cross-sectional meridional corneal profiles (along steepest and
flattest meridians, located by a Scheimpflug-based corneal topography) for each individual
are obtained by using a RTVue100® (Optovue Inc. Fremont, California, USA), 26000-Hz SD-OCT
across the central 6mm diameter of the cornea.
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