This Article  • References  • Full text PDF  • Reply to article  • Send to a friend  • Save in My Folder  • Save to citation manager  • Permissions  Citing Articles  • Citation map  • Citing articles on HighWire  • Contact me when this article is cited  Related Content  • Similar articles in this journal  Social Bookmarking   What's this?

Leo J. Maguire, MD; Steven E. Wilson, MD; Jon J. Camp; Steven Verity, MD

Arch Ophthalmol. 1993;111(2):259-262.

Abstract
• Newly devised software was used to compare the ability of the Topographic Modeling System-1 (Computed Anatomy, New York, NY) and the Corneal Analysis System (EyeSys Laboratories, Houston, Tex) to reproduce power measurements on spherical surfaces. Reproducibility results were compared for spheres of 40.00, 42.50, and 44.00 diopters. The program determines the absolute difference in corneal power at defined keratoscope positions for paired examinations of the same eye. Four examinations of each sphere were obtained with each instrument. Individual points were sampled at specific keratoscope locations at 30°-semimeridional intervals. The program compared variability of measurements at four defined ranges of distance from the vertex normal: within 0.60 mm, 0.61 to 1.5 mm, 1.51 to 2.5 mm, and 2.5 mm or greater. The Corneal Analysis System showed significantly greater variability of readings obtained within 0.60 mm of the vertex normal for all three spheres (P=.001 by Duncan's multiple comparison procedure), whereas the Topographic Modeling System-1 showed equally consistent readings within 0.60 mm as it did between 0.61 and 1.5 mm from the vertex normal.

Author Affiliations
From the Department of Ophthalmology (Dr Maguire) and Biomedical Imaging Resource (Mr Camp), Mayo Clinic and Mayo Foundation, Rochester, Minn, and the Department of Ophthalmology (Drs Wilson and Verity), University of Texas Southwestern Medical Center, Dallas. The authors have no proprietary interest in the methods or materials used in this study.

Footnotes
Accepted for publication September 24, 1992.

Reprint requests to Mayo Clinic, 200 First St SW, Rochester, MN 55905 (Dr Maguire).

CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter     What's this?

THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES

Clinical evaluation of keratometry and computerised videokeratography: intraobserver and interobserver variability on normal and astigmatic corneas
Karabatsas et al.
Br J Ophthalmol 1998;82:637-642.
ABSTRACT | FULL TEXT