Volume 7 Issue 6
Nov.  2014
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HE Yuan-qing, LIU Yong-ji, ZHAI Yi. Optical design of imaging keratometer[J]. Chinese Optics, 2014, 7(6): 956-961. doi: 10.3788/CO.20140706.0956
Citation: HE Yuan-qing, LIU Yong-ji, ZHAI Yi. Optical design of imaging keratometer[J]. Chinese Optics, 2014, 7(6): 956-961. doi: 10.3788/CO.20140706.0956

Optical design of imaging keratometer

  • Received Date: 16 Sep 2014
  • Rev Recd Date: 15 Nov 2014
  • Publish Date: 25 Nov 2014
  • An imaging keratometer by the aid of modern optoelectronic technology is proposed to improve the accuracy of measurement. The optical system consists of an annular object, a first imaging subsystem, a second imaging subsystem, and a CCD detector. First, the first imaging subsystem and second imaging subsystem are designed and optimized by ZEMAX, and two subsystems are connected by a semitransparent mirror. Then we perform optimization of the whole optical system of imaging keratometer. Finally, the simulation of the illumination of the annular image is accomplished by TracePro. The result shows that the measurement range of this imaging keratometer is about 30D to 60D(5.5 mm to 11 mm in radius of curvature), and the accuracy is about 0.072D in the case of the radius of curvature of 7.8 mm.

     

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  • [1] LIANG J,GRIMM B,GOELZ S. Objective measurement of wave aberrations of the human eye with the use of a Hartmann-Shack wave-front sensor[J]. JOSA A,1994,11(7):1949-1957.
    [2] LEE J. Wavefront technology for spectacle lenses[J]. Review of Ophthalmology,2005,12(3):91.
    [3] SEIPLE W H,SZLYK J P. Clinical investigation into the vision performance provided by the iZon spectacle lens system[J]. Review Ophthalmology,2008,145(2):1.
    [4] THIBOS L N,HONG X,BRADLEY A,et al.. Accuracy and precision of objective refraction from wavefront aberrations[J]. J. Vision,2004,4(4):329-351.
    [5] HE J,GWIAZDA J,THORN F,et al. Wave-front aberrations in the anterior corneal surface and the whole eye[J]. J. Opt. Soc. Am. A,2003,20(7):1155-1163.
    [6] GUO H,WANG Z,ZHAO Q. Individual eye model based on wavefront aberration[J]. Optik,2005,116(2):80-85.
    [7] GUTMARK R,GUYTON D L. Origins of the keratometer and its evolving role in ophthalmology[J]. Survey of Ophthalmology,2010,55(5):481-497.
    [8] HANNUSH S B,CRAWFORD S L,WARING G O. Accuracy and precision of keratometry, photokeratoscopy, and corneal modeling on calibrated steel balls[J]. Arch Ophthalmol,1989,107(8):1235-1239.
    [9] LIU Z,HUANG A,PFLUGFELDER S. Evaluation of corneal thickness and topography in normal eyes using the Orbscan corneal topography system[J]. Br J Ophthalmol,1999,83(7):774-778.
    [10] P REZ J G,CERVI O A,GIRALDEZ M J. Accuracy and precision of EyeSys and Orbscan systems on calibrated spherical test surfaces[J]. Eye and Contact Lens,2004,30(2):74-78.
    [11] LACKNER B,SCHMIDINGER G,PIEH S,et al.. Repeatability and reproducibility of central corneal thickness measurement with Pentacam, Orbscan, and ultrasound[J]. Optom. Vis. Sci,2005,82(10):892-899.

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