Design of a human eye retinal camera optical system with dual-wavelength coaxial astigmatism correction
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Design of a human eye retinal camera optical system with dual‑wavelength coaxial astigmatism correction Duo Wang1,2 · Rui Ouyang1,2 · Guoling Bi1 · Longxu Jin1 · Xingxiang Zhang1 Received: 1 April 2020 / Accepted: 6 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In order to better improve vision, an accurate measurement of the aberrations in the human eye has important experimental and clinical significance. An adaptive fundus camera that uses a double-column lens to correct human astigmatism is designed. In the illumination system, ring light generated by a pair of axicon lenses is used to illuminate the human eye, abandoning the traditional illumination method. In the target adjustment system, a simple real image is set, the plane mirror group and the double cylinder lens are adjusted, and the defocus and astigmatism of the human eye are corrected, so that the residual aberration of the human eye is controlled within the correction range of the adaptive imaging system. In the adaptive imaging system, a Shack–Hartmann wavefront sensor is used as a wavefront detector, and a liquid crystal spatial light modulator is used as a wavefront corrector to correct the high-order aberrations of the human eye. The lighting system and imaging system operate in different bands. The simulation results show that the illumination light path avoids the strongly reflected light of the cornea and can uniformly illuminate the human eye. The design of the adaptive imaging system achieves the diffraction limit, and the astigmatism is corrected by a cylindrical lens in the imaging system. Additional aberrations are generated, and the plane mirror is adjusted to adjust the optical path to accommodate human eyes with different diopters. Keywords Human eye · Fundus camera · Illumination system · Adaptive imaging system
1 Introduction The human brain obtains information from the outside world through five senses every day. Researchers at Harvard Business School in the United States have shown that the proportion of visually accepted information reaches 83%. A natural scene forms an inverted real * Duo Wang [email protected] 1
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
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University of Chinese Academy of Sciences, Beijing 100049, China
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image on the retina through the optical system of the human eye. The human eye is an extremely complex optical system that is intelligent but not perfect (Smith 2008) . When the human eye is stimulated by external light, the internal refractive medium, surface curvature and thickness will vary from person to person. Many animals, including humans, inherently experience refractive errors, which means that the axial length and power of the eye do not match (Yau et al. 2012). In addition, many human diseases, such as diabetes and hypertension, can cause retinopathy (Zhang et al. 2019; Ogagarue et al. 2013). Because the blood
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