Bionic human eye vision system

Abstract

The invention relates to a bionic human eye vision system, and belongs to the technical field of interdiscipline of biomedicine and optics. The whole system is placed on a unified optical platform and comprises a white light source, a linear maneuvering translation stage, an observed target, a band-pass filter, an achromatic lens, a polaroid, an electric control diaphragm, an artificial lens, a scanning lens, a two-dimensional galvanometer, a beam splitter, a light beam quality analyzer, a total reflective mirror, a lens, a high-sensitivity photoelectric detector and a computer. The device has the advantages that the structure is novel, the light inlet amount of the system can be automatically adjusted through the high-sensitivity detector and the feedback control circuit, overexposure can be prevented, objects at different distances and different angles can be detected by adjusting the artificial lens and the two-dimensional galvanometer, the basic functions of human eyes are simulated, and the detection accuracy is improved. Images can be collected and processed in a complex environment.

Description

Technical Field

[0001] The present invention belongs to the interdisciplinary technical field of biomedicine and optics, and particularly relates to a bionic human eye vision system for simulating the imaging of the human eye on various complex external environments. Background Art

[0002] At present, certain progress has been made in the research of bionic human eye vision systems, especially in the aspects of simulating the basic optical transmission and image acquisition of the human eye, and they have been widely applied. For example, some existing technologies use a fixed white light source, a preset filter, a standard lens combination, and a mechanical diaphragm to simulate the imaging process of the human eye, so as to evaluate the optical performance and imaging quality of intraocular lenses. However, the existing technologies have the following deficiencies: First, traditional methods usually rely on precision optical test instruments and evaluate imaging performance through complex optical parameter measurements. However, these methods have high equipment costs, complex operations, and demanding test environments, and it is often difficult to reflect the actual situation inside the patient's eye. Second, the current control for adjusting the light input of the system mostly uses a fixed mechanism or a preset program, lacking a real-time self-feedback adjustment mechanism. Traditional methods generally adjust the incident light amount through a mechanical diaphragm, but cannot automatically optimize the adjustment parameters according to the image quality and light intensity information real-time feedback by the sensor, resulting in the system being difficult to maintain the best imaging state in an environment with large changes in light conditions. This is particularly crucial when evaluating intraocular lenses because the imaging quality of intraocular lenses is affected by multiple factors such as incident light intensity, beam distribution, and optical aberration, and a single preset adjustment cannot meet the requirements for high-quality imaging in a changing environment. Summary of the Invention

[0003] The present invention provides a bionic human eye vision system to simulate the collection and processing of images by the human eye in complex and changing environments.

[0004] The technical solution adopted by the present invention is as follows: The light beam emitted by the white light source illuminates the observed target. The observed target is installed on a linear motorized translation stage. The light beam passes through a 546 nm band-pass filter and an achromatic lens 1, then passes through a polarizer 1 and a polarizer 2. After that, the light beam passes through an electro-optic diaphragm 1, converges at the electro-optic diaphragm 2 through the intraocular lens. After the light beam comes out of the electro-optic diaphragm 2, it passes through a scanning lens and a two-dimensional galvanometer. After the light beam is reflected by the two-dimensional galvanometer, it is split by a beam splitter. Among them, the transmitted light beam converges through an achromatic lens 2 and then enters the beam quality analyzer for imaging, while the reflected light beam is reflected by a total reflection mirror again, and then converges through a lens and enters a high-sensitivity detector to detect the light intensity. Both the beam quality analyzer and the high-sensitivity detector are connected to a computer, and the computer processes the image and light intensity information collected by them.

[0005] The entire system of the present invention is placed on a unified optical platform. Among them, the white light source, the object to be observed, the band-pass filter of 546 nm, the first achromatic lens, the first polarizer, the second polarizer, the first electrically controlled diaphragm, the intraocular lens, the second electrically controlled diaphragm, and the scanning lens are at the same height and coaxial. The object to be observed is placed on the front focal plane of the first achromatic lens.

[0006] The white light source of the present invention uses a white LED lamp.

[0007] The focal length of the first achromatic lens of the present invention is 160 mm.

[0008] The second polarizer of the present invention is placed on an electrically controlled rotating displacement platform and connected to a computer. After the light beam passes through the first polarizer, it becomes linearly polarized light. By controlling the rotation of the second polarizer, the included angle of the polarization angles between the two polarizers is changed, thereby adjusting the magnitude of the incident light intensity.

[0009] The first electrically controlled diaphragm of the present invention is connected to a computer and is used to simulate the pupil. The field of view and the light input amount are adjusted by adjusting the size of the first electrically controlled diaphragm.

[0010] The second electrically controlled diaphragm of the present invention is used to simulate the macula area, and the center position of the field of view is determined by adjusting its position.

[0011] The function of the two-dimensional galvanometer of the present invention is to simulate the rotation of the eyeball, and precise detection of a certain area is achieved by adjusting it.

[0012] The beam quality analyzer of the present invention uses a beam profiler.

[0013] The present invention feeds back the magnitude of the light intensity detected by the high-sensitivity detector to the second polarizer and the first electrically controlled diaphragm, and adjusts the light input amount by adjusting them to prevent overexposure.

[0014] The advantages of the present invention are novel structure. The automatic adjustment of the light input amount of the system can be realized through the high-sensitivity detector and the feedback control circuit to prevent overexposure. By adjusting the intraocular lens and the two-dimensional galvanometer, objects at different distances and different angles can be detected, thus simulating the basic functions of the human eye and enabling the collection and processing of images in a complex environment.

[0015] The present invention does not rely on traditional complex optical parameter calculations. Instead, it directly collects the images output by the imaging device to visually judge whether the imaging is clear and the light intensity distribution. By observing the sharpness of details and the uniformity of light intensity in the image, the imaging effect of the intraocular lens under different working conditions can be quickly understood, thereby providing a reference for clinical visual acuity prediction. The present invention dynamically adjusts the angle of the polarizer and the size of the electro-optic diaphragm by computer intelligent analysis of the light intensity and image data fed back by the detector, effectively adapts to changes in ambient light, and realizes real-time optimization control of the light input amount to ensure the best imaging effect under different lighting conditions. In addition, the system is equipped with an analog two-dimensional galvanometer and a mechanical displacement platform, which can accurately simulate the rotation, focusing, and pupil changes of the human eye, and truly restore the dynamic visual performance of the eyeball at different viewing angles and different focal lengths, thereby improving the evaluation accuracy of the multifocal and continuous visual range characteristics of the intraocular lens.

[0016] The present invention realizes the dynamic evaluation and optimization of the imaging quality of the intraocular lens through a real-time monitoring method based on image clarity and light intensity distribution, combined with a self-feedback adjustment technique. This system not only overcomes the problems of discontinuous detection and slow response in the traditional technology under complex environments, but also has the advantages of simple operation, low cost, and strong adaptability, and has a high technical level and broad application prospects. Brief Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of an artificial human eye visual system; Among them: white light source (white LED lamp) 1, linear motorized translation stage (travel 300 mm) 2, observed target (USAF 1951 resolution target) 3, band-pass (BF) filter with a wavelength of 546 nm 4, achromatic lens 1 (focal length 160 mm) 5, polarizer 1 6, polarizer 2 7, electro-optic diaphragm 1 8, intraocular lens 9, electro-optic diaphragm 2 10, scanning lens 11, two-dimensional galvanometer 12, beam splitter 13, achromatic lens 2 14, beam quality analyzer (beam profiler BC207VIS, Thorlabs) 15, total reflection mirror 16, lens 17, highly sensitive photodetector 18, computer 19. Detailed Embodiments

[0018] The present invention will be described below in conjunction with the accompanying drawings, as Figure 1As shown, the light beam emitted by the white light source 1 illuminates the observed target 3. The observed target 3 is installed on a linear motorized translation stage 2. The light beam passes through a band-pass filter 4 with a wavelength of 546 nm and an achromatic lens 5, then passes through a polarizer 6 and a polarizer 7. After that, the light beam passes through an electronically controlled aperture 8, converges at the electronically controlled aperture 10 through the intraocular lens 9. After the light beam exits from the electronically controlled aperture 10, it passes through a scanning lens 11 and a two-dimensional galvanometer 12. After the light beam is reflected by the two-dimensional galvanometer 12, it is split by a beam splitter 13. The transmitted light beam converges through an achromatic lens 14 and then enters the beam quality analyzer 15 for imaging, while the reflected light beam is reflected by a total reflection mirror 16 again, and then converges through a lens 17 and enters a high-sensitivity detector 18 to detect the light intensity. Both the beam quality analyzer 15 and the high-sensitivity detector 18 are connected to a computer 19, and the information of the collected images and light intensity is processed by the computer 19.

[0019] The entire system is placed on a unified optical platform. Among them, the white light source 1, the observed target 3, the band-pass filter 4 with a wavelength of 546 nm, the achromatic lens 5, the polarizer 6, the polarizer 7, the electronically controlled aperture 8, the intraocular lens 9, the electronically controlled aperture 10, and the scanning lens 11 are at the same height and coaxial. The observed target 3 is placed on the front focal plane of the achromatic lens 5.

[0020] The white light source uses a white LED lamp 1.

[0021] The focal length of the achromatic lens 5 is 160 mm.

[0022] The polarizer 7 is placed on an electronically controlled rotational displacement platform and is connected to the computer 19. After the light beam passes through the polarizer 6, it becomes linearly polarized light. By controlling the rotation of the polarizer 7, the included angle of the polarization angles between the two polarizers is changed, thereby adjusting the magnitude of the incident light intensity. The electronically controlled aperture 8 is connected to the computer 19 and is used to simulate the pupil. The field of view and the light input amount are adjusted by adjusting the size of the electronically controlled aperture 8. The electronically controlled aperture 10 is used to simulate the macula area, and the center position of the field of view is determined by adjusting its position. The function of the two-dimensional galvanometer 12 is to simulate the rotation of the eyeball, and precise detection of a certain area is achieved by adjusting it. The beam quality analyzer 15 uses a beam profiler (BC207VIS, Thorlabs). The magnitude of the light intensity detected by the high-sensitivity detector 18 is fed back to the polarizer 7 and the electronically controlled aperture 8, and the light input amount is adjusted by adjusting them to prevent overexposure.

[0023] Working principle: As Figure 1As shown in the figure, the white light source uses a white LED lamp 1, and the observed target 3 uses a United States Air Force (USAF) 1951 resolution target 3, which is installed on a linear motorized translation stage 2 with a travel of 300 mm. The light emitted by the white LED lamp 1 illuminates the resolution target 3. The observed target is placed on the linear motorized platform, so that the position of the target can be adjusted to simulate the human eye observing near-field and far-field objects; the light beam passing through the observed object passes through a band-pass filter 4 with a wavelength of 546 nm and an achromatic lens 5 with a focal length of 160 mm. The 546-nm band-pass filter is used to simulate the characteristic that the human eye is most sensitive to light around 546 nm; then it passes through two polarizers. The second polarizer 7 is placed on an electrically controlled rotational displacement platform. After the light beam passes through the first polarizer 6, it becomes linearly polarized light. By controlling the rotation of the second polarizer 7, the included angle of the polarization angle between the two polarizers can be changed, thereby adjusting the intensity of the incident light. In this way, the imaging clarity measurement of the visual system under different light intensities can be simulated; then the light beam passes through the electrically controlled aperture 8, converges at the electrically controlled aperture 10 through the artificial lens 9. The electrically controlled aperture 8 is used to simulate the pupil, and the field of view and the light input can be adjusted by adjusting the size of the aperture. Adjust the artificial lens 9 to make the system image clear. The electrically controlled aperture 10 is used to simulate the macula area, and its position is adjusted to determine the position of the center of the field of view; after the light beam exits from the electrically controlled aperture 10, it passes through a scanning lens 11 and a two-dimensional galvanometer 12. The function of the two-dimensional galvanometer 12 is to simulate the rotation of the eyeball and then simulate the precise detection of a certain area by the macula area; after the light beam is reflected by the two-dimensional galvanometer 12, it is split by a beam splitter 13. The transmitted light beam converges through the achromatic lens 14 and then enters the beam quality analyzer for imaging. Here, a beam profiler (BC207VIS, Thorlabs) 15 is used as the beam quality analyzer, while the reflected light beam is reflected by a total reflection mirror 16 again, and then converges through the lens 17 and enters a highly sensitive photodetector 18 to detect the light intensity. The second polarizer 7, the electrically controlled aperture 8, the beam profiler 15 and the highly sensitive photodetector 18 are all connected to the computer 19. Through the compiled software, the information of the images and light intensity collected by the beam profiler 15 and the highly sensitive photodetector 18 is analyzed, and then the second polarizer 7 is rotated and the size of the electrically controlled aperture 8 is changed according to the analysis results, thereby adjusting the light input of the system and preventing overexposure to ensure that the system images under appropriate light intensity.

Claims

1. An artificial human eye vision system, characterized in that: The light beam emitted by the white light source illuminates the observed target, which is installed on a linear motorized translation stage. The light beam passes through a 546 nm band-pass filter and an achromatic lens 1, then through polarizer 1 and polarizer 2. After that, the light beam passes through an electro-optic aperture 1, converges at the electro-optic aperture 2 through the intraocular lens. After the light beam exits from the electro-optic aperture 2, it passes through a scanning lens and a two-dimensional galvanometer. After being reflected by the two-dimensional galvanometer, the light beam is split by a beam splitter. The transmitted light beam converges through an achromatic lens 2 and then enters the beam quality analyzer for imaging, while the reflected light beam is reflected by a total reflection mirror again, and then converges through a lens and enters a high-sensitivity detector to detect the light intensity. Both the beam quality analyzer and the high-sensitivity detector are connected to a computer, and the information of the collected images and light intensity is processed by the computer.

2. The artificial human eye vision system according to claim 1, wherein: The entire system is placed on a unified optical platform. Among them, the white light source, the observed target, the 546 nm band-pass filter, the achromatic lens 1, polarizer 1, polarizer 2, electro-optic aperture 1, intraocular lens, electro-optic aperture 2, and scanning lens are at the same height and coaxial. The observed target is placed on the front focal plane of the achromatic lens 1.

3. The artificial human eye vision system according to claim 1, wherein: The white light source uses a white LED lamp.

4. The artificial human eye vision system according to claim 1, wherein: The focal length of the achromatic lens 1 is 160 mm.

5. The artificial human eye vision system according to claim 1, wherein: The polarizer 2 is placed on an electrically controlled rotational displacement platform and is connected to the computer. After the light beam passes through polarizer 1, it becomes linearly polarized light. By controlling the rotation of polarizer 2, the included angle of the polarization angles between the two polarizers is changed, thereby adjusting the magnitude of the incident light intensity.

6. The artificial human eye vision system according to claim 1, wherein: The electro-optic aperture 1 is connected to the computer and is used to simulate the pupil. The field of view and the light input amount are adjusted by adjusting the size of the electro-optic aperture 1.

7. The artificial human eye vision system according to claim 1, wherein: The electro-optic aperture 2 is used to simulate the macula area, and the center position of the field of view is determined by adjusting its position.

8. The artificial human eye vision system according to claim 1, characterized in that: The function of the two-dimensional galvanometer is to simulate the rotation of the eyeball, and precise detection of a certain area is achieved through its adjustment.

9. The artificial human eye vision system according to claim 1, characterized in that: The beam quality analyzer uses a beam profiler.

10. A biomimetic human eye vision system according to claim 1, characterized in that: The magnitude of the light intensity detected by the high-sensitivity detector is fed back to polarizer 2 and electro-optic aperture 1, and the light input amount is adjusted by adjusting them to prevent overexposure.

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