Corneal modeling using conic section fits of PAR Corneal Topography System measurements

S. Zipper, F. Manns, V. Fernandez, S. Sandadi, A. Ho, J. M. Parel

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The purpose of this study was to measure the average shape and variability of human corneas and to develop a tool for analyzing height and curvature based on a conic section model. Fresh Eye Bank Eyes were placed in Dextran until the corneal thickness reached a physiological value. The eyes were placed in a custom made holder and measured using an intraoperative PAR Corneal Topography System (CTS) mounted on an operation microscope. Topography was measured before and after removal of the epithelium. A series of MATLAB functions were written to analyze the raw-z (height) data in polar coordinates. The functions fit conic sections to the PAR CTS data along hemi-meridians at 5° intervals. The conic shape factor and apical radius were used to calculate and display the curvature. The dependence of these parameters with meridional position was examined.

Original languageEnglish (US)
Pages (from-to)107-112
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Jan 1 2001


  • Aberrations
  • Asphericity
  • Conic
  • Corneal topography
  • Curvature
  • Shape factor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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