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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Stephen A. Burns
  • Vol. 23, Iss. 4 — Apr. 1, 2006
  • pp: 769–776

Impact of Zernike-fit error on simulated high- and low-contrast acuity in keratoconus: implications for using Zernike-based corrections

Jason D. Marsack, Konrad Pesudovs, Edwin J. Sarver, and Raymond A. Applegate  »View Author Affiliations

JOSA A, Vol. 23, Issue 4, pp. 769-776 (2006)

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This study examines the extent to which a Zernike-based optical correction can restore acuity in keratoconus as a function of disease severity and contrast level. Increasingly complete Zernike corrections in the presence of Zernike-fit error were simulated. Acuity for keratoconic eyes with < 60 D maximum corneal power reached 20 13 with a fifth-order Zernike correction under high-contrast conditions and exhibited a loss of 0.1 logMAR (minimum angle of resolution) (from 20 32 to 20 40 ) for low-contrast conditions. Acuity for keratoconic eyes with > 60 D maximum corneal power approached 20 13 with sixth–tenth-order corrections under high-contrast conditions but did not return to similar levels with a tenth-order correction for low-contrast conditions. The results suggest that fit error affects visual performance for more difficult tasks and that restoring high-contrast acuity ( 20 16 or better) using a fifth-order Zernike correction is not limited by Zernike-fit error for over 88% of keratoconus cases.

© 2006 Optical Society of America

OCIS Codes
(330.1070) Vision, color, and visual optics : Vision - acuity
(330.4060) Vision, color, and visual optics : Vision modeling
(330.5370) Vision, color, and visual optics : Physiological optics

ToC Category:
Vision, Color, and Visual Optics

Original Manuscript: May 9, 2005
Revised Manuscript: August 12, 2005
Manuscript Accepted: August 31, 2005

Virtual Issues
Vol. 1, Iss. 5 Virtual Journal for Biomedical Optics

Jason D. Marsack, Konrad Pesudovs, Edwin J. Sarver, and Raymond A. Applegate, "Impact of Zernike-fit error on simulated high- and low-contrast acuity in keratoconus: implications for using Zernike-based corrections," J. Opt. Soc. Am. A 23, 769-776 (2006)

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