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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 15, Iss. 9 — Sep. 1, 1998
  • pp: 2488–2496

Choice of reference axis in ocular wave-front aberration measurement

Chengwu Cui and Vasudevan Lakshminarayanan  »View Author Affiliations

JOSA A, Vol. 15, Issue 9, pp. 2488-2496 (1998)

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The geometrical center of the pupil has often been used as the reference axis in ocular wave-front aberration measurement. However, the geometrical center of the pupil may shift when the pupil size changes under different conditions. In particular, for subjective methods, defining the center of the pupil precisely during the actual measurement is not always practical. Furthermore, the geometrical center of the pupil may not define the chief ray of the ocular optics because of the Stiles–Crawford apodization effect, which has a peak location that often deviates from the geometrical center of the pupil. We present the coefficient transformation table of the Taylor polynomial up to the sixth order with respect to reference axis shift. We illustrate the effect of wave-front aberration change with reference axis shift with experimental data. This type of wave-front aberration change could be a true measurement error if there is an error in defining the reference axis. We also propose using the coaxially sighted corneal reflex as a better reference axis in aberration measurement.

© 1998 Optical Society of America

OCIS Codes
(010.7350) Atmospheric and oceanic optics : Wave-front sensing

Original Manuscript: December 1, 1997
Revised Manuscript: March 26, 1998
Manuscript Accepted: April 2, 1998
Published: September 1, 1998

Chengwu Cui and Vasudevan Lakshminarayanan, "Choice of reference axis in ocular wave-front aberration measurement," J. Opt. Soc. Am. A 15, 2488-2496 (1998)

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