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Journal of Biomedical Optics • Open Access

Optical surface reconstruction technique through combination of zonal and modal fitting
Author(s): Julián Espinosa; David Mas; Jorge Pérez; Carlos Illueca

Paper Abstract

Videokeratometers and Scheimpflug cameras permit accurate estimation of corneal surfaces. From height data it is possible to adjust analytical surfaces that will be later used for aberration calculation. Zernike polynomials are often used as adjusting polynomials, but they have shown to be not precise when describing highly irregular surfaces. We propose a combined zonal and modal method that allows an accurate reconstruction of corneal surfaces from height data, diminishing the influence of smooth areas over irregular zones and vice versa. The surface fitting error is decreased in the considered cases, mainly in the central region, which is more important optically. Therefore, the method can be established as an accurate resampling technique.

Paper Details

Date Published: 1 March 2010
PDF: 7 pages
J. Biomed. Opt. 15(2) 026022 doi: 10.1117/1.3394260
Published in: Journal of Biomedical Optics Volume 15, Issue 2
Show Author Affiliations
Julián Espinosa, Univ. de Alicante (Spain)
David Mas, Univ. de Alicante (Spain)
Jorge Pérez, Univ. de Alicante (Spain)
Carlos Illueca, Univ. de Alicante (Spain)

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