Corneal modeling using conic section fits of PAR corneal topography system measurements

Stanley Zipper; Fabrice Manns; Viviana Fernandez; Samith Sandadi; Arthur Ho; Jean-Marie A. Parel

doi:10.1117/12.429261

7 June 2001 Corneal modeling using conic section fits of PAR corneal topography system measurements

Stanley Zipper, Fabrice Manns, Viviana Fernandez, Samith Sandadi, Arthur Ho, Jean-Marie A. Parel

Proceedings Volume 4245, Ophthalmic Technologies XI; (2001) https://doi.org/10.1117/12.429261
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

Abstract

The purpose of this study was to measure the average shape and variability of human corneas and to develop a tool for analyzing, height, curvature, and aberrations 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 degree(s) 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.

Citation Download Citation

Stanley Zipper, Fabrice Manns, Viviana Fernandez, Samith Sandadi, Arthur Ho, and Jean-Marie A. Parel "Corneal modeling using conic section fits of PAR corneal topography system measurements", Proc. SPIE 4245, Ophthalmic Technologies XI, (7 June 2001); https://doi.org/10.1117/12.429261

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