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Proceedings Paper

Application of laser differential confocal technique in back vertex power measurement for phoropters
Author(s): Fei Li; Lin Li; Xiang Ding; Wenli Liu
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Paper Abstract

A phoropter is one of the most popular ophthalmic instruments used in optometry and the back vertex power (BVP) is one of the most important parameters to evaluate the refraction characteristics of a phoropter. In this paper, a new laser differential confocal vertex-power measurement method which takes advantage of outstanding focusing ability of laser differential confocal (LDC) system is proposed for measuring the BVP of phoropters. A vertex power measurement system is built up. Experimental results are presented and some influence factor is analyzed. It is demonstrated that the method based on LDC technique has higher measurement precision and stronger environmental anti-interference capability compared to existing methods. Theoretical analysis and experimental results indicate that the measurement error of the method is about 0.02m-1.

Paper Details

Date Published: 15 October 2012
PDF: 9 pages
Proc. SPIE 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 84171N (15 October 2012); doi: 10.1117/12.975924
Show Author Affiliations
Fei Li, Beijing Institute of Technology (China)
National Institute of Metrology (China)
Lin Li, Beijing Institute of Technology (China)
Xiang Ding, National Institute of Metrology (China)
Wenli Liu, National Institute of Metrology (China)


Published in SPIE Proceedings Vol. 8417:
6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Yudong Zhang; Libin Xiang; Sandy To, Editor(s)

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