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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. 16, Iss. 10 — Oct. 1, 1999
  • pp: 2343–2351

Reassessing the theoretical accuracy of the crossed-cylinder aberroscope technique

Michael J. Cox and Richard Calver  »View Author Affiliations


JOSA A, Vol. 16, Issue 10, pp. 2343-2351 (1999)
http://dx.doi.org/10.1364/JOSAA.16.002343


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Abstract

We replicated results of the theoretical accuracy of the Howland crossed-cylinder aberroscope for measuring the monochromatic aberration of the human eye [J. Opt. Soc. Am. A 15, 2477 1998]. Two simple modifications to the previous mathematical analysis techniques, namely, the use of a new method for estimating the size of the unaberrated retinal grid element length and the correction of the aberroscope grid spacing size for magnification differences introduced during predistortion, almost completely eliminate the errors introduced into 4th-order wave-front-aberration coefficients for a centered predistorted aberroscope grid over a large range of back vertex distances. The use of the crossed cylinders in the aberroscope introduces only small amounts of wave-front aberration to the measurements of the schematic eye. Wave-front aberrations above the 4th order in a Taylor polynomial expression can introduce errors that vary as a function of pupil area. Results produced by orthogonal polynomial analysis confirm the least-squares analysis results. We believe that the Howland crossed-cylinder aberroscope can be used in its objective form to make accurate measurements of at least the 4th-order components of the wave-front aberration of the human eye. We note that care must be exercised both in the use of the equipment and in the analysis of the results to ensure that accuracy is maintained.

© 1999 Optical Society of America

OCIS Codes
(000.2170) General : Equipment and techniques
(080.1010) Geometric optics : Aberrations (global)
(080.2720) Geometric optics : Mathematical methods (general)
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(170.4460) Medical optics and biotechnology : Ophthalmic optics and devices
(330.0330) Vision, color, and visual optics : Vision, color, and visual optics

History
Original Manuscript: January 14, 1999
Revised Manuscript: May 21, 1999
Manuscript Accepted: May 21, 1999
Published: October 1, 1999

Citation
Michael J. Cox and Richard Calver, "Reassessing the theoretical accuracy of the crossed-cylinder aberroscope technique," J. Opt. Soc. Am. A 16, 2343-2351 (1999)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-16-10-2343

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