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| Calibration and Traceability Method for Human Cornea Parameters |
| ZHANG Ji-yan,LIU Wen-li,GAO Ming-liang,DING Xiang,SUN Jie |
| National Institute of Metrology, Beijing 100029, China |
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Abstract Corneal curvature radius, corneal refractive power and astigmatic axis are key parameters for evaluation of human corneal topography. In order to accurately measure and trace the human cornea parameters, based on the principle of human corneal reflection imaging, a series of standards for human corneal parameters were developed for the first time in the form of spherical and toroidal surface design. For curvature radius the measurement range is (5.5～10.0) mm and uncertainty is 0.002mm (k=2). While for axis the measurement range is (0°~180°) and uncertainty is 1° (k=2). Moreover, national standard for ophthalmometers has been established and traceability system for corneal parameters has been formed. Experimental results showed that the measurement standard and traceability system can meet the requirements of calibration and traceability of human corneal parameter instrument, and guarantee the accuracy of corneal parameter measurement.
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Received: 08 January 2019
Published: 02 November 2020
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| Fund:National key research and development program of China |
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Corresponding Authors:
DING Xiang
E-mail: dingxiang@nim.ac.cn
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2020, Vol. 41 
