Adaptive optics retina imaging system based on bimorph deformable mirror

Abstract

An adaptive optics retina imaging system based on a bimorph deformable mirror mainly comprises two bimorph deformable mirrors, a Hartmann wavefront sensor (HWS), a CCD camera and a control system. The system is characterized in that the two bimorph deformable mirrors adopt different structures; one of the bimorph deformable mirrors has fewer unit numbers and is used for correcting large-amplitude defocus and astigmatism while the other one has more unit numbers and is used for correcting other higher order aberration with relatively small amplitude; the two deformable mirrors form a series connection structure in the lightpath. With the advantages of compact structure and large correcting value, the bimorph deformable mirror can greatly shrink the volume of the current system and provide greater correction capability; relatively low manufacturing cost of the bimorph deformable mirror can contribute to reduction of the cost of the system.

Description

technical field [0001] The invention relates to an adaptive optics retinal imaging system, an adaptive optics retinal imaging system based on a bimorph deformable mirror, belongs to the technical field of adaptive optics wavefront correction, and is a medical equipment manufacturing technology for human eye retinal imaging field. Background technique [0002] The eye is a window of the human body, and diseases of the eye itself and other diseases of the human body (such as diabetes, etc.) can be reflected in the fundus, so if the observation of the retina can be realized, such diseases can be diagnosed early. The ophthalmoscope is a commonly used medical examination instrument for the retina of the human eye. However, the retina is a complex tissue, and due to the aberrations of the various tissues of the human eye, it is difficult to observe the fine structure of retinal cells with high resolution with ordinary ophthalmoscopes. Adaptive optics technology has the ability t...

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Problems solved by technology

Although this system can obtain retinal imaging, the volume of the system is very large due to the large diameter of the deformable mirror used; and the deformation of the discrete deformable mirror is relatively limited, which limits the low-order images that the system can correct. Poor amplitude, it is difficult to meet the correction requirements of the actual human eye aberration

[0004] Chinese patents CN1282564, CN1282565, CN1306796, and CN1306797 introduced several other adaptive optics retinal imaging systems, mainly using Zernike phase contrast technology and technologies such as co-anxiety wave diaphragm to improve the quality of imaging, but the wavefront corrector is not Without effective improvement, the ability to correct low-order large-value aberrations is still insufficient; the Chinese patent with the publication number CN2728418 introduces a pre-compensation device to increase the correction amount of the system to low-order aberrations, but such The device needs to replace the pre-correction lens frequently, the operation is complicated and the ideal correction effect is often not obtained

[0005] US Patent 6331059B1 introduces another adaptive optics retinal imaging system, which uses an 18-unit bimorph deformable mirror to realize the compensation of large-value low-order aberrations, and then uses a series of processing algorithms to further improve Imaging quality, but this algorithm process is more complicated and the ability to correct high-order aberrations is not guaranteed

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