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| The Development of Axial Standard Device for Calibration of Ophthalmometers |
| ZHANG Ji-yan,LI Jiao,GAO Ming-liang,DING Xiang |
| Division of Medical and Biological Measurement, National Institute of Metrology, Beijing 100029, China |
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Abstract In order to resolve the axis calibration of ophthalmometers, aixal standard device is developed which consists of axial model eye, axial sleeve and measurement support. Axial model eye is a square cylinder whose front surface is toroidal and back surface is scrub plane, which is located in the square through hole of axial sleeve, and axial sleeve is located on the trapezoid groove of measurement support. By assembly and mechanical positioning,the measurement of four axes of 0°, 45°, 90° and 135° are achieved and axis uncertainty is about 0.5° with coverage factor of 2, which meets the requirement of axis calibration for different kinds of ophthalmometers. Moreover, the developed axial standard device not only expands measurement capabilities of the existing working standard of ophthalmometers, but also provides technical support for revision of related verification regulations.
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Received: 11 June 2015
Published: 19 April 2017
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Corresponding Authors:
ZHANG JiJiyan
E-mail: zhangjy@nim.ac.cn
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2017, Vol. 38 
