Large-dynamic-range Shack-Hartmann refraction measurement based on deep learning

Haobo Zhang; Yanrong Yang; Zitao Zhang; Chun Yin; Shengqian Wang; Hao Chen; Junlei Zhao

doi:10.1117/12.3047813

13 December 2024 Large-dynamic-range Shack-Hartmann refraction measurement based on deep learning

Haobo Zhang, Yanrong Yang, Zitao Zhang, Chun Yin, Shengqian Wang, Hao Chen, Junlei Zhao

Author Affiliations +

Proceedings Volume 13503, AOPC 2024: Biomedical Optics; 1350308 (2024) https://doi.org/10.1117/12.3047813
Event: Applied Optics and Photonics China 2024 (AOPC2024), 2024, Beijing, China

Abstract

The human eye wavefront aberrator based on the Shack-Hartmann wavefront sensor (SHWFS) has become a common device for detecting eye aberrations in modern ophthalmology clinics. In order to eliminate the problem of spot and subaperture matching in traditional methods, we use deep learning method to directly map Hartmann spot pattern and corresponding Zernike coefficient, so as to expand the dynamic range of measurement. The lightweight network realizes to fully extract high dimensional feature information and achieves high precision measurement of diopter and astigmatism. The experimental results show that the proportion of the network falling into the tolerant error range (±0.25D) in diopter and astigmatism measurement reaches 94.2% and 100%. This method can measure the low order aberrations of human eyes effectively without changing the SHWFS setting, and at the same time ensure the accuracy and dynamic range, which has been verified by the real machine.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Haobo Zhang, Yanrong Yang, Zitao Zhang, Chun Yin, Shengqian Wang, Hao Chen, and Junlei Zhao "Large-dynamic-range Shack-Hartmann refraction measurement based on deep learning", Proc. SPIE 13503, AOPC 2024: Biomedical Optics, 1350308 (13 December 2024); https://doi.org/10.1117/12.3047813

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KEYWORDS

Wavefronts

Wavefront sensors

Image processing

Monochromatic aberrations

Deep learning

Eye

Refraction

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