Ms. Bei Wang Profile

Bei Wang

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Proceedings Article | 5 November 2020 Paper

Measurement of human eye aberrations using an optical simulator based on pyramid wavefront sensor

Chaoyan Wang, Xinyang Chen, Zheng Zheng, Zhaohui Bu, Jianqing Cai, Yuanyuan Ding, Bei Wang

Proceedings Volume 11566, 1156615 (2020) https://doi.org/10.1117/12.2580684

KEYWORDS: Eye, Modulation, Wavefront sensors, Monochromatic aberrations, Optical simulations, Wavefronts, Sensors, Prisms, Deformable mirrors

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In general, most of the adaptive optical systems for human eye aberration detection are based on the wavefront slope measurement provided by the Shark-Hartman wavefront sensor (SHWS), and then the wavefront slope is fed back to the deformable mirror to correct the human eye aberrations. Compared with the SHWS, the pyramid wavefront sensor (PWS) has the characteristics of fast sampling speed, wide linear capture range, and high sensitivity. Our works show that the modulation angle of the dynamic high-frequency modulator affects the dynamic measurement range, linearity and sensitivity of the pyramid sensing. The dynamic measurement range and the linear fitting residuals are both proportional to the modulation angle, and the sensitivity is inversely proportional to the modulation angle. Pixel combination affects the sensitivity of the detection signals of the pyramid sensor. The pixel combination mode of 1 × 1, 2 × 2, and 3 × 3 is tested respectively. When the pixel combination mode of 2 × 2 is used, the sensitivity of the signals will be highest significantly. In addition, the beacon light used to detect the human eye should not be too strong. The grinding “blind zone” of the spires and edges will have a scattering effect on the incident light and cause loss of light energy. Therefore, it is necessary to optimize the parameters of the pyramid sensor and further improve the processing technology of the pyramid prism.

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