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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 7 — Jul. 16, 2007

Corneal surface reconstruction algorithm using Zernike polynomial representation: improvements

Jason Turuwhenua  »View Author Affiliations

JOSA A, Vol. 24, Issue 6, pp. 1551-1561 (2007)

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Recently Sicam et al. [ J. Opt. Soc. Am. A 21, 1300 (2004) ] presented a new corneal reconstruction algorithm for estimating corneal sag by Zernike polynomials. An equivalent but simpler derivation of the model equations is presented. The algorithm is tested on a sphere, a conic, and a toric. These tests reveal significant height errors that accrue with distance from the corneal apex. Additional postprocessing steps are introduced to circumvent these errors. A consistent and significant reduction in height errors is observed across the test surfaces. Finally, Sicam et al. used the conic p-value p as a measure of algorithm efficacy. Further investigation shows that the finite Zernike representation affected the reported results. The p-value should therefore be used with caution as an efficacy measure.

© 2007 Optical Society of America

OCIS Codes
(170.3890) Medical optics and biotechnology : Medical optics instrumentation
(170.4460) Medical optics and biotechnology : Ophthalmic optics and devices

ToC Category:
Medical Optics and Biotechnology

Original Manuscript: February 10, 2006
Revised Manuscript: October 11, 2006
Manuscript Accepted: October 28, 2006
Published: May 9, 2007

Virtual Issues
Vol. 2, Iss. 7 Virtual Journal for Biomedical Optics

Jason Turuwhenua, "Corneal surface reconstruction algorithm using Zernike polynomial representation: improvements," J. Opt. Soc. Am. A 24, 1551-1561 (2007)

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