Research on eye axial length measurement system based on Twyman-Green interferometer combined with digital signal processing

Qi Zhou; Kang Xu; Ming-hui Chen; Hua-zhong Xiang; Gang Zheng; Jie Zhao; Da-wei Zhang; Song-lin Zhuang; Cheng Wang

doi:10.1117/12.2606504

24 November 2021 Research on eye axial length measurement system based on Twyman-Green interferometer combined with digital signal processing

Qi Zhou, Kang Xu, Ming-hui Chen, Hua-zhong Xiang, Gang Zheng, Jie Zhao, Da-wei Zhang, Song-lin Zhuang, Cheng Wang

Author Affiliations +

Proceedings Volume 12067, AOPC 2021: Biomedical Optics; 120670D (2021) https://doi.org/10.1117/12.2606504
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China

Abstract

Accurate measurement of ocular axis length (AL) is important for myopia control and vision recovery after cataract lens implantation. A low-coherence dual-beam external differential interference ocular AL measurement system (i.e. the new AL system) was built based on a modified Twyman-Green interferometer with a 790 nm infrared laser as the light source. Combined with digital signal processing techniques, the weak light interferometric signals acquired by DAQ card are processed synchronously. The FIR digital filter and signal envelope extraction method are designed to improve the signal-to-noise ratio, so as to obtain a high signal-to-noise ratio AL interference signal. To verify the effectiveness of the system, the correlation and consistency of AL between the new AL system and IOLMaster are analyzed. The results showed that the new AL system can provide valid AL measurements, indicating that the new AL system developed by our team can be used for routine clinical AL measurements.

Citation Download Citation

Qi Zhou, Kang Xu, Ming-hui Chen, Hua-zhong Xiang, Gang Zheng, Jie Zhao, Da-wei Zhang, Song-lin Zhuang, and Cheng Wang "Research on eye axial length measurement system based on Twyman-Green interferometer combined with digital signal processing", Proc. SPIE 12067, AOPC 2021: Biomedical Optics, 120670D (24 November 2021); https://doi.org/10.1117/12.2606504

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available