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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Franco Gori
  • Vol. 31, Iss. 1 — Jan. 1, 2014
  • pp: 114–123

Estimating the eye aberration coefficients in resized pupils: is it better to refit or to rescale?

Salvador Bará, Eliseo Pailos, Justo Arines, Norberto López-Gil, and Larry Thibos  »View Author Affiliations

JOSA A, Vol. 31, Issue 1, pp. 114-123 (2014)

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In order to work in a consistent way with Zernike aberration coefficients estimated in different pupils, it is necessary to refer them to a common pupil size. Two standard approaches can be used to that end: to rescale algebraically the coefficients estimated in the original pupil or to refit them anew using the wavefront slope measurements available within the new one. These procedures are not equivalent; they are affected by different estimation errors that we address in this work. Our results for normal eye populations show that in case of reducing the pupil size it is better to rescale the original coefficients than to refit them using the measurements contained within the smaller pupil. In case of enlarging the pupil size, as it can a priori be expected, the opposite holds true. We provide explicit expressions to quantify the errors arising in both cases, including the expected error incurred when extrapolating the Zernike estimation beyond the radius where the measurements were made.

© 2013 Optical Society of America

OCIS Codes
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(030.6600) Coherence and statistical optics : Statistical optics
(220.1010) Optical design and fabrication : Aberrations (global)
(330.5370) Vision, color, and visual optics : Physiological optics
(330.7325) Vision, color, and visual optics : Visual optics, metrology

ToC Category:
Vision, Color, and Visual Optics

Original Manuscript: October 9, 2013
Manuscript Accepted: November 19, 2013
Published: December 12, 2013

Virtual Issues
Vol. 9, Iss. 3 Virtual Journal for Biomedical Optics

Salvador Bará, Eliseo Pailos, Justo Arines, Norberto López-Gil, and Larry Thibos, "Estimating the eye aberration coefficients in resized pupils: is it better to refit or to rescale?," J. Opt. Soc. Am. A 31, 114-123 (2014)

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