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

S. Zipper, Fabrice Manns, V. Fernandez, S. Sandadi, A. Ho, Jean-Marie A Parel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

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 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)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsF. Manns, P.G. Soderberg, A. Ho
Pages107-112
Number of pages6
Volume4245
DOIs
StatePublished - 2001
EventOphthalmic Technologies XI - San Jose, CA, United States
Duration: Jan 20 2001Jan 21 2001

Other

OtherOphthalmic Technologies XI
CountryUnited States
CitySan Jose, CA
Period1/20/011/21/01

Fingerprint

Topography
topography
curvature
polar coordinates
dextrans
cornea
Dextran
data systems
epithelium
holders
MATLAB
Microscopes
microscopes
intervals
radii

Keywords

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

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Zipper, S., Manns, F., Fernandez, V., Sandadi, S., Ho, A., & Parel, J-M. A. (2001). Corneal modeling using conic section fits of PAR Corneal Topography System measurements. In F. Manns, P. G. Soderberg, & A. Ho (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4245, pp. 107-112) https://doi.org/10.1117/12.429261

Corneal modeling using conic section fits of PAR Corneal Topography System measurements. / Zipper, S.; Manns, Fabrice; Fernandez, V.; Sandadi, S.; Ho, A.; Parel, Jean-Marie A.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / F. Manns; P.G. Soderberg; A. Ho. Vol. 4245 2001. p. 107-112.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Zipper, S, Manns, F, Fernandez, V, Sandadi, S, Ho, A & Parel, J-MA 2001, Corneal modeling using conic section fits of PAR Corneal Topography System measurements. in F Manns, PG Soderberg & A Ho (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 4245, pp. 107-112, Ophthalmic Technologies XI, San Jose, CA, United States, 1/20/01. https://doi.org/10.1117/12.429261
Zipper S, Manns F, Fernandez V, Sandadi S, Ho A, Parel J-MA. Corneal modeling using conic section fits of PAR Corneal Topography System measurements. In Manns F, Soderberg PG, Ho A, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4245. 2001. p. 107-112 https://doi.org/10.1117/12.429261
Zipper, S. ; Manns, Fabrice ; Fernandez, V. ; Sandadi, S. ; Ho, A. ; Parel, Jean-Marie A. / Corneal modeling using conic section fits of PAR Corneal Topography System measurements. Proceedings of SPIE - The International Society for Optical Engineering. editor / F. Manns ; P.G. Soderberg ; A. Ho. Vol. 4245 2001. pp. 107-112
@inproceedings{42bdf5638be544818b37ff3a16b9dd56,
title = "Corneal modeling using conic section fits of PAR Corneal Topography System measurements",
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 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.",
keywords = "Aberrations, Asphericity, Conic, Corneal topography, Curvature, PAR CTS, Shape factor",
author = "S. Zipper and Fabrice Manns and V. Fernandez and S. Sandadi and A. Ho and Parel, {Jean-Marie A}",
year = "2001",
doi = "10.1117/12.429261",
language = "English (US)",
volume = "4245",
pages = "107--112",
editor = "F. Manns and P.G. Soderberg and A. Ho",
booktitle = "Proceedings of SPIE - The International Society for Optical Engineering",

}

TY - GEN

T1 - Corneal modeling using conic section fits of PAR Corneal Topography System measurements

AU - Zipper, S.

AU - Manns, Fabrice

AU - Fernandez, V.

AU - Sandadi, S.

AU - Ho, A.

AU - Parel, Jean-Marie A

PY - 2001

Y1 - 2001

N2 - 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.

AB - 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.

KW - Aberrations

KW - Asphericity

KW - Conic

KW - Corneal topography

KW - Curvature

KW - PAR CTS

KW - Shape factor

UR - http://www.scopus.com/inward/record.url?scp=0034873346&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034873346&partnerID=8YFLogxK

U2 - 10.1117/12.429261

DO - 10.1117/12.429261

M3 - Conference contribution

VL - 4245

SP - 107

EP - 112

BT - Proceedings of SPIE - The International Society for Optical Engineering

A2 - Manns, F.

A2 - Soderberg, P.G.

A2 - Ho, A.

ER -