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Topographic pattern and apex location of keratoconus on elevation topography maps
N H Demirbas1, S C Pflugfelder
1Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami School of Medicine, Florida 33136, USA.
Cornea
|October 2, 1998
Summary
Elevation topography maps reveal distinct keratoconus apex locations compared to axial curvature maps, potentially improving diagnosis and management of this corneal condition.
Area of Science:
- Ophthalmology
- Corneal Imaging
- Keratoconus Diagnosis
Background:
- Keratoconus is a progressive thinning of the cornea, leading to irregular astigmatism.
- Accurate topographic assessment is crucial for diagnosis and management.
- Current methods often rely on axial curvature, but elevation mapping offers a different perspective.
Purpose of the Study:
- To compare topography patterns and apex locations between elevation and axial curvature maps in keratoconic corneas.
- To evaluate the concordance between different topographic systems (PAR-CTS and TMS-1).
Main Methods:
- Prospective evaluation of 72 keratoconic corneas using PAR Corneal Topography System (PAR-CTS) elevation and axial curvature displays.
- Comparison with 66 corneas using Tomey Topographic Modeling System (TMS-1) axial curvature display.
- Analysis of topography patterns and cone apex locations.
Main Results:
- High concordance was found between PAR-CTS and TMS-1 axial curvature maps for patterns and apex locations.
- Low concordance was observed between PAR-CTS elevation and axial curvature modes.
- Elevation maps showed a majority of apices in the inferotemporal quadrant, differing significantly from axial curvature maps.
Conclusions:
- Elevation and curvature-based corneal topography provide different insights into keratoconus.
- Elevation mapping highlights a specific inferotemporal apex location, potentially enhancing diagnostic specificity.
- Elevation mapping may improve contact lens fitting and surgical outcomes in keratoconus patients.