PMID: 8587766Nov 1, 1995Paper

How accurately can videokeratographic systems measure surface elevation?

Optometry and Vision Science : Official Publication of the American Academy of Optometry
R A ApplegateH C Howland

Abstract

Surface topography, as opposed to dioptric topography, defines the corneal surface in simple terms without assumptions. Accordingly, it is important to know how well surface topography can be measured with current videokeratometric machines. The purpose of this paper is to quantify the accuracy with which the TMS-1 Corneal Modeling System can measure the surface topography of calibrated spherical, elliptical, and bicurve surfaces. The Computed Anatomy TMS-1 videokeratometer was used to measure three spherical, three elliptical, and two bicurve surfaces with known characteristics. Surface characteristics were either back-calculated from the dioptric files or directly obtained from the TMS-1 elevation file for each of 6400 points (256 points in each of 25 rings). The accuracy with which each method determined the true surface was quantified by calculating the root mean squared error (RMSE) of the 6400 measured surface elevations from the known surface elevation at each sampling point. (1) For spherical and elliptical surfaces, back-calculation of surface elevation from the dioptric file can be made with RMSE of 5 mu or less. (2) For spheres but not elliptical surfaces the TMS-1 elevation file defines the surface with RMSE 5 mu or...Continue Reading

Citations

Sep 17, 2002·Journal of Cataract and Refractive Surgery·Sergio BarberoJesús Merayo-Lloves
Oct 3, 2000·Optometry and Vision Science : Official Publication of the American Academy of Optometry·W TangB Davis
Feb 25, 2003·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Fan LuJi C He
Nov 17, 2004·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Jason Turuwhenua, Jon Henderson
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