OSA's Digital Library

Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 35 — Dec. 10, 2013
  • pp: 8532–8539

Design of imaging keratometer with annular object and charge-coupled device detector

Yuanqing He, Yan Wang, Zhaoqi Wang, Yao Wang, Yongji Liu, Lin Zhang, Yi Zhai, and Shengjiang Chang  »View Author Affiliations


Applied Optics, Vol. 52, Issue 35, pp. 8532-8539 (2013)
http://dx.doi.org/10.1364/AO.52.008532


View Full Text Article

Enhanced HTML    Acrobat PDF (820 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

A novel imaging keratometer by the aid of modern optoelectronic technology is proposed. The optical system consists of an annular object, a first imaging subsystem, a second imaging subsystem, and a CCD detector. The measurement range of corneal refraction is from 30D to 60D (5.5–11 mm in radius of curvature), and the accuracy reaches 0.156D, 0.072D, and 0.036D, respectively, for the corneal surface of the steepest, the radius of curvature of 7.8 mm, and the corneal surface of the flattest. The accuracy of corneal astigmatism is verified to be 0.05D for cylindrical refraction of 0.75D. Compared with the traditional keratometer, the proposed keratometer possesses advantages of high accuracy.

© 2013 Optical Society of America

OCIS Codes
(120.3890) Instrumentation, measurement, and metrology : Medical optics instrumentation
(330.7327) Vision, color, and visual optics : Visual optics, ophthalmic instrumentation

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: August 19, 2013
Revised Manuscript: November 4, 2013
Manuscript Accepted: November 5, 2013
Published: December 6, 2013

Virtual Issues
Vol. 9, Iss. 2 Virtual Journal for Biomedical Optics

Citation
Yuanqing He, Yan Wang, Zhaoqi Wang, Yao Wang, Yongji Liu, Lin Zhang, Yi Zhai, and Shengjiang Chang, "Design of imaging keratometer with annular object and charge-coupled device detector," Appl. Opt. 52, 8532-8539 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-35-8532


Sort:  Author  |  Year  |  Journal  |  Reset  

References

  1. J. Liang, B. Grimm, S. Goelz, and J. F. Bille, “Objective measurement of wave aberrations of the human eye with the use of a Hartmann–Shack wave-front sensor,” J. Opt. Soc. Am. A 11, 1949–1957 (1994). [CrossRef]
  2. S. MacRae, R. R. Krueger, and R. A. Applegate, Customized Corneal Ablation: The Quest for Supervision (Slack, 2001).
  3. J. F. Bille, C. F. H. Harner, and F. F. Loesel, Aberration-Free Refractive Surgery: New Frontiers in Vision (Springer, 2002).
  4. J. Lee, “Wavefront technology for spectacle lenses,” Rev. Ophthalmol. 12(3), 91 (2005).
  5. W. H. Seiple and J. P. Szlyk, “Clinical investigation into the vision performance provided by the iZon spectacle lens system,” Rev. Ophthalmol. 145(2), 1 (2008).
  6. L. N. Thibos, X. Hong, A. Bradley, and R. A. Applegate, “Accuracy and precision of objective refraction from wavefront aberrations,” J. Vision 4(4), 329–351 (2004). [CrossRef]
  7. J. He, J. Gwiazda, F. Thorn, and R. Held, “Wave-front aberrations in the anterior corneal surface and the whole eye,” J. Opt. Soc. Am. A 20, 1155–1163 (2003). [CrossRef]
  8. H. Guo, Z. Wang, Q. Zhao, W. Quan, and Y. Wang, “Individual eye model based on wavefront aberration,” Optik 116, 80–85 (2005). [CrossRef]
  9. R. Gutmark and D. L. Guyton, “Origins of the keratometer and its evolving role in ophthalmology,” Surv. Ophthalmol. 55, 481–497 (2010). [CrossRef]
  10. S. B. Hannush, S. L. Crawford, G. O. Waring, M. C. Gemmill, M. J. Lynn, and A. Nizam, “Accuracy and precision of keratometry, photokeratoscopy, and corneal modeling on calibrated steel balls,” Arch. Ophthalmol. 107, 1235–1239 (1989). [CrossRef]
  11. Z. Liu, A. Huang, and S. Pflugfelder, “Evaluation of corneal thickness and topography in normal eyes using the Orbscan corneal topography system,” Br. J. Ophthalmol. 83, 774–778 (1999). [CrossRef]
  12. J. G. Pérez, A. Cerviño, M. J. Giraldez, M. Parafita, and E. Yebra-Pimentel, “Accuracy and precision of EyeSys and Orbscan systems on calibrated spherical test surfaces,” Eye Contact Lens 30, 74–78 (2004). [CrossRef]
  13. B. Lackner, G. Schmidinger, S. Pieh, M. A. Funvoics, and C. Skorpik, “Repeatability and reproducibility of central corneal thickness measurement with Pentacam, Orbscan, and ultrasound,” Optom. Vis. Sci. 82, 892–899 (2005). [CrossRef]
  14. Y. Sun, S. Duthaler, and B. J. Nelson, “Autofocusing in computer microscopy: selecting the optimal focus algorithm,” Microsc. Res. Tech. 65, 139–149 (2004). [CrossRef]
  15. D. A. Atchison and G. Smith, “Chromatic dispersions of the ocular media of human eyes,” J. Opt. Soc. Am. A 22, 29–37 (2005). [CrossRef]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.


« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited