Liquid crystal adaptive aberration correction retinal imaging device with high-efficiency utilization of energy

Abstract

The invention belongs to the technical field of adaptive optical imaging, and relates to an optical design of high resolution imaging of fundus oculi retina, which is a liquid crystal adaptive aberration correction retinal imaging device with high-efficiency utilization of energy. The imaging device is characterized in that a polarizing beam splitter prism which is normally arranged on a front light path of a liquid crystal corrector is moved to be behind the liquid crystal corrector; a beam splitter with a high transmission-reflection ratio is arranged at the position where the polarizing beam splitter prism is originally positioned; an annular diaphragm is inserted to shield the light vertically entering human eyes, so interference light directly reflected by a front cornea is basically eliminated. The polarizing beam splitter prism is placed corresponding to an e-light polarization direction of the liquid crystal corrector; the corrected e-light is separated from non-corrected o-light; the e-light is allowed to enter an imaging CCD camera in follow-up light paths, and the o-light enters a Hartmann wavefront detector; a controller drives the liquid crystal corrector to perform aberration correction according to wavefront detected by Hartmann to make the imaging in the CCD clear. The imaging device can increase the light energy utilization ratio for imaging and detection by about 1 time, so that the costs of the imaging cameras and detectors are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of fundus microscopic imaging, and relates to a high-contrast fundus self-adaptive correction imaging technology, in particular to a liquid crystal self-adaptive aberration correction retinal imaging device with high energy utilization. Background technique [0002] The blood vessels on the retina are the only small blood vessels that can be directly seen in the human body. They belong to the terminal vascular system. Any pathological damage and vascular obstruction can lead to tissue hypoxia, necrosis or rupture and leakage. Therefore, fundus changes are manifestations of systemic diseases. Clinical ophthalmoscopes are often used to observe changes in fundus capillaries to judge pathological changes, such as cardiovascular and cerebrovascular and endocrine disorders, arteriosclerosis, hypertension, central serous choroidal retinopathy, and diabetic retinopathy. Lesions etc. Since the 1960s, ophthalmoscopes...

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Problems solved by technology

[0005] At present, there are 4 Chinese invention patents mentioning that the retinal adaptive correction imaging system can use a liquid crystal corrector (Zhang Yudong, et al., Chinese invention patents: adaptive optics retinal imaging system, ZL99115053. .x), two of the patents adopt a common optical path design, and a 1 / 4 wavelength plate is placed before the corrector, so that the light incident on the corrector is circularly polarized light. In fact, the liquid crystal corrector cannot work in circularly polarized light The other two patents are not aimed at the optimized design of the liquid crystal corrector. The beam splitter placed in front of the human eye will lose half the light intensity emitted by the human eye, which may be possible for a liquid crystal corrector system with a large energy loss. is a fatal flaw

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