An electronically controlled focusing system using dual light wedge split image for fundus imaging

GAI Junshuai; MA Yuting; ZHANG Yunhai; YANG Haomin; LIU Yulong

doi:10.7510/jgjs.issn.1001-3806.2024.04.005

LASER TECHNOLOGY > 2024 > 48(4): 484-490. > DOI: 10.7510/jgjs.issn.1001-3806.2024.04.005

GAI Junshuai, MA Yuting, ZHANG Yunhai, YANG Haomin, LIU Yulong. An electronically controlled focusing system using dual light wedge split image for fundus imaging[J]. LASER TECHNOLOGY, 2024, 48(4): 484-490. DOI: 10.7510/jgjs.issn.1001-3806.2024.04.005

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An electronically controlled focusing system using dual light wedge split image for fundus imaging

1.
College of Electronic and Information Engineering, Changchun University of Science and Technology, Changchun 130000, China
2.
Jiangsu Key Laboratory of Medical Optics, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Science, Suzhou 215163, China
3.
The Second Affiliated Hospital of Soochow University, Suzhou 215004, China

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Received Date: July 27, 2023
Revised Date: August 24, 2023
Published Date: July 24, 2024

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Abstract

Abstract

In order to achieve precise focusing during fundus imaging, an electronically controlled focusing system using dual light wedge split image was designed. A 905 nm near-infrared semiconductor laser was used to form a rectangular sight mark on the retina through a dual light wedge and a rectangular slit. The movement of the sight compensation mirror and the dual light wedge mechanism was realized by motor control, and the displacement correlation between the sight compensation mirror and the dual light wedge was obtained. According to the separation of the rectangular sight mark, the defocus compensation state was real-time feedback, and the control system was guided to move the dual light wedge and the sight compensation mirror to achieve accurate focusing during fundus imaging. The focusing experiment of fundus imaging was conducted on the simulated eye, and the result showed that system can achieve -10 m^-1~10 m^-1 refractive compensation, and the focusing accuracy was more than 1 m^-1. The electronically controlled focusing system using dual light wedge split image has fast focusing speed and high precision, which provides a basis for the development of automatic fundus imaging instruments.
- laser technique,
- defocus compensation,
- closed-loop control,
- visual target

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References

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