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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. 15, Iss. 9 — Sep. 1, 1998
  • pp: 2477–2487

Assessment of the accuracy of the crossed-cylinder aberroscope technique

George Smith, Raymond A. Applegate, and David A. Atchison  »View Author Affiliations


JOSA A, Vol. 15, Issue 9, pp. 2477-2487 (1998)
http://dx.doi.org/10.1364/JOSAA.15.002477


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Abstract

Simulations of the optics of the Howland crossed-cylinder aberroscope technique show that errors in alignment, data collection, and analysis can lead to unexpected asymmetries of the determined aberrations in a rotationally symmetric system. In particular, coma can be incorrectly indicated. The magnitude of the error in aberration measurement depends on the magnitude of the alignment, data collection, and alignment errors. These findings indicate that the tolerances for setting up the technique and data collection should be analyzed thoroughly before quantitative significance is given to the determined aberration coefficients.

© 1998 Optical Society of America

OCIS Codes
(080.1010) Geometric optics : Aberrations (global)
(110.3000) Imaging systems : Image quality assessment
(170.4460) Medical optics and biotechnology : Ophthalmic optics and devices
(330.4460) Vision, color, and visual optics : Ophthalmic optics and devices
(330.7310) Vision, color, and visual optics : Vision

History
Original Manuscript: January 12, 1998
Revised Manuscript: April 8, 1998
Manuscript Accepted: April 20, 1998
Published: September 1, 1998

Citation
George Smith, Raymond A. Applegate, and David A. Atchison, "Assessment of the accuracy of the crossed-cylinder aberroscope technique," J. Opt. Soc. Am. A 15, 2477-2487 (1998)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-15-9-2477


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References

  1. B. Howland, H. C. Howland, “Subjective measurement of high-order aberrations of the eye,” Science 193, 580–582 (1976). [CrossRef] [PubMed]
  2. H. C. Howland, B. Howland, “A subjective method for the measurement of monochromatic aberrations of the eye,” J. Opt. Soc. Am. 67, 1508–1518 (1977). [CrossRef] [PubMed]
  3. G. Walsh, W. N. Charman, H. C. Howland, “Objective technique for the determination of monochromatic aberrations of the human eye,” J. Opt. Soc. Am. A 1, 987–992 (1984). [CrossRef] [PubMed]
  4. G. Walsh, W. N. Charman, “Measurement of the axial wavefront aberration of the human eye,” Ophthalmic Physiol. Opt. 5, 23–31 (1985). [CrossRef] [PubMed]
  5. D. A. Atchison, M. J. Collins, C. F. Wildsoet, J. Christensen, M. D. Waterworth, “Measurement of monochromatic ocular aberrations of human eyes as a function of accommodation by the Howland aberroscope technique,” Vision Res. 35, 313–323 (1995). [CrossRef] [PubMed]
  6. M. J. Collins, C. F. Wildsoet, D. A. Atchison, “Monochromatic aberrations and myopia,” Vision Res. 35, 1157–1163 (1995). [CrossRef] [PubMed]
  7. G. Walsh, M. J. Cox, “A new computerized video-aberroscope for the determination of the aberrations of the human eye,” Ophthalmic Physiol. Opt. 15, 403–408 (1985). [CrossRef]
  8. G. Smith, R. A. Applegate, H. C. Howland, “The crossed-cylinder aberroscope: an alternative method of calculation of the aberrations,” Ophthalmic Physiol. Opt. 16, 222–229 (1996). [CrossRef] [PubMed]
  9. Please contact George Smith by e-mail at G.Smith@optometry.unimelb.edu.au for copies of the programs referred to in this paper.
  10. G. Smith, D. A. Atchison, The Eye and Visual Optical Instruments (Cambridge U. Press, Cambridge, 1997), pp. 636, 677, and 681.
  11. R. A. Applegate, H. C. Howland, R. P. Sharp, A. J. Cottingham, R. W. Yee, “Corneal aberrations, visual performance and refractive surgery,” J. Refract. Surg. 14, 397–407 (1998). [PubMed]
  12. C. E. Martı́nez, R. A. Applegate, S. D. Klyce, M. B. McDonald, J. P. Medina, H. C. Howland, “Effect of pupil dilation on corneal optical aberrations after photorefractive keratectomy,” Arch. Opththalmol. (Chicago) (to be published).
  13. This does not necessarily mean that the coma error is greater than the spherical aberration. The coma coefficient gives the error at the edge of a 1-mm-radius pupil. If the pupil radius is ρ, the level of coma error at the edge of the pupil is the value of the coma coefficient multiplied by ρ3, while the level of spherical aberration is the value of the spherical aberration coefficient multiplied by ρ4.

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