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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 21, Iss. 5 — May. 1, 2004
  • pp: 683–696

Validation of a combined corneal topographer and aberrometer based on Shack–Hartmann wave-front sensing

Fan Zhou, Xin Hong, Donald T. Miller, Larry N. Thibos, and Arthur Bradley  »View Author Affiliations


JOSA A, Vol. 21, Issue 5, pp. 683-696 (2004)
http://dx.doi.org/10.1364/JOSAA.21.000683


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Abstract

A corneal aberrometer based on Shack–Hartmann wave-front sensing was developed and validated by using calibrated aspheric surfaces. The aberrometer was found to accurately measure corneal reflective aberrations, from which corneal topography and corneal refractive aberrations were derived. Measurements of reflective aberrations correlated well with theory ( R 2 = 0.964 to 0.994). The sag error root mean square (RMS) was small, ranging from 0.1 to 0.17 μm for four of the five calibrated surfaces with the fifth at 0.36 μm as a result of residual defocus. Measured refractive aberrations matched with theory and whole-eye aberrometry to within a small fraction of a wavelength. Measurements on three human corneas revealed very large refractive astigmatism (0.65–1.2 μm) and appreciable levels of trefoil (0.08–0.47 μm), coma (0.14–0.19 μm), and spherical aberration (0.18–0.25 μm). The mean values of these aberrations were significantly larger than the RMS in repeated measurements.

© 2004 Optical Society of America

OCIS Codes
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(170.3890) Medical optics and biotechnology : Medical optics instrumentation
(330.0330) Vision, color, and visual optics : Vision, color, and visual optics
(330.4300) Vision, color, and visual optics : Vision system - noninvasive assessment
(330.4460) Vision, color, and visual optics : Ophthalmic optics and devices
(330.5370) Vision, color, and visual optics : Physiological optics

History
Original Manuscript: June 6, 2003
Revised Manuscript: November 3, 2003
Manuscript Accepted: November 3, 2003
Published: May 1, 2004

Citation
Fan Zhou, Xin Hong, Donald T. Miller, Larry N. Thibos, and Arthur Bradley, "Validation of a combined corneal topographer and aberrometer based on Shack–Hartmann wave-front sensing," J. Opt. Soc. Am. A 21, 683-696 (2004)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-21-5-683

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