PMID: 8587772Nov 1, 1995Paper

PAR Corneal Topography System (PAR CTS): the clinical application of close-range photogrammetry

Optometry and Vision Science : Official Publication of the American Academy of Optometry
M W BelinC D Ratliff

Abstract

The PAR Corneal Topography System (CTS) is a computer-driven corneal imaging system which uses close-range photogrammetry (rasterphotogrammetry) to measure and produce a topographic map of the corneal surface. The PAR CTS makes direct point-by-point measurements of surface elevation using a stereo-triangulation technique. The CTS uses a grid pattern composed of horizontal and vertical lines spaced about 0.2 mm (200 microns) apart. Each grid intersection comprises a surface feature which can be located in multiple images and used to generate an (x,y,z) coordinate. Unlike placido disc-based videokeratoscopes, the PAR CTS requires neither a smooth reflective surface nor precise spatial alignment for accurate imaging. In addition to surface elevation, the PAR CTS computes axial and tangential curvatures and refractive power. Difference maps are available in all curvatures, refractive power, and in absolute elevation.

Citations

Aug 28, 2002·Medical & Biological Engineering & Computing·D C BergJ K Mahood
Jun 25, 1999·The British Journal of Ophthalmology·Z LiuS C Pflugfelder
Nov 30, 2002·Journal of Cataract and Refractive Surgery·Luis A CarvalhoWallace Chamon
Feb 22, 2005·Journal of Cataract and Refractive Surgery·Gerard Cairns, Charles N J McGhee
Jun 27, 1998·Journal of Cataract and Refractive Surgery·D Priest, R Munger
Aug 26, 2006·Journal of Cataract and Refractive Surgery·Joseph B Ciolino, Michael W Belin
Oct 3, 2000·Optometry and Vision Science : Official Publication of the American Academy of Optometry·W TangB Davis
Aug 10, 2004·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Luis Alberto Carvalho
Sep 1, 2016·Journal of Biomedical Optics·Jason D Micali, John E Greivenkamp
Mar 1, 1997·Journal of Cataract and Refractive Surgery·S C NaufalN S Granet
Aug 15, 2000·International Ophthalmology Clinics·C G EshbaughR R Krueger
Aug 6, 2020·Sensors·Bin LiuFengzhou Fang

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