Abstract

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

Full Article  |  PDF Article
OSA Recommended Articles
Videokeratoscope for accurate and detailed measurement of the cornea surface

Juergen H. Massig, Elke Lingelbach, and Bernd Lingelbach
Appl. Opt. 44(12) 2281-2287 (2005)

Forward ray tracing for image projection prediction and surface reconstruction in the evaluation of corneal topography systems

Joris J. Snellenburg, Boy Braaf, Erik A. Hermans, Rob G.L. van der Heijde, and Victor Arni D. P. Sicam
Opt. Express 18(18) 19324-19338 (2010)

Corneal surface reconstruction algorithm that uses Zernike polynomial representation

Victor Arni D. P. Sicam, Joris Coppens, Rob G. L. van der Heijde, and Tom J. T. P. van den Berg
J. Opt. Soc. Am. A 21(7) 1300-1306 (2004)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (7)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (3)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (47)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription