Application of laser differential confocal technique in back vertex power measurement for phoropters

Fei Li; Lin Li; Xiang Ding; Wenli Liu

doi:10.1117/12.975924

15 October 2012 Application of laser differential confocal technique in back vertex power measurement for phoropters

Fei Li, Lin Li, Xiang Ding, Wenli Liu

Proceedings Volume 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 84171N (2012) https://doi.org/10.1117/12.975924
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

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.

Citation Download Citation

Fei Li, Lin Li, Xiang Ding, and Wenli Liu "Application of laser differential confocal technique in back vertex power measurement for phoropters", Proc. SPIE 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 84171N (15 October 2012); https://doi.org/10.1117/12.975924

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