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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