Wide line scanning fundus imaging system and imaging method

Abstract

According to the wide-line scanning fundus imaging system and imaging method, the wide-line-shaped light beam is adopted for illuminating the fundus, illumination and image data collection are carried out on a strip-shaped area of the fundus at a time, and the strip-shaped fundus area comprises multiple rows of pixels on the camera; the method is different from traditional line scanning confocal fundus imaging which only obtains one row or a few rows of pixel information of the fundus at a time, so that the exposure time of the fundus image on the camera is prolonged, and the imaging signal-to-noise ratio is improved.

Description

Technical Field

[0001] The present application relates to the technical field of fundus scanning imaging, and in particular to a wide-line scanning fundus imaging system and imaging method. Background Art

[0002] Among all blinding eye diseases, fundus disease is the main cause of irreversible vision loss. The treatment process of fundus disease is long, and early screening, early diagnosis, and early treatment are the key to preventing and treating fundus disease. Many fundus diseases start to develop in the periphery and then gradually affect the macular area. Therefore, it is of great significance to develop imaging instruments that can examine the retina including the peripheral part of the fundus.

[0003] Traditional fundus photography and fundus angiography have a small imaging field and low image clarity. They can only shoot within a range of about 50° of the fundus at a time, but cannot shoot the peripheral area of ​​the fundus. Scanning laser ophthalmoscopy (SLO) uses laser points to scan the fundus point by point and line by line. It has high imaging contrast and a large fundus imaging field, and can achieve ultra-wide-angle imaging. The disadvantage is that it uses laser as the illumination light source, which poses certain laser safety risks. In addition, the laser spectrum width is very narrow, and several wavelengths of laser are used to image the fundus separately. The fundus color image is obtained by image fusion, and the image color has relatively large distortion.

[0004] Line scanning fundus imaging can use LED light source as the illumination light source. Through the multi-wavelength LED synthesis of white light source, fundus imaging can be done in true color. In addition, the eye being examined often has refractive errors, such as high myopia or high hyperopia. When imaging the fundus, it is necessary to focus according to the refractive condition of the eye being examined to ensure that the fundus picture with accurate focus and clarity can be taken. In traditional fundus cameras, a diopter compensation mirror is introduced into the imaging optical path. According to the refractive error of the eye being examined, the diopter compensation mirror is moved forward and backward along the optical axis so that the fundus retina can be accurately focused on the imaging device such as the camera. Traditional fundus photography uses wide-field illumination. When the eye being examined has refractive error, the illumination beam remains unchanged. When imaging the fundus by line scanning, a linear or strip-shaped illumination beam needs to be formed at the fundus. When the eye being examined has refractive error, in addition to focusing the imaging optical path, it is also necessary to adjust the illumination optical path in real time according to the refractive condition of the eye being examined so that the fundus can always form a linear or strip-shaped illumination beam to form a clear and sharp fundus image. Summary of the invention

[0005] In view of this, it is necessary to provide a wide-line scanning fundus imaging system and imaging method for achieving true color ultra-wide-angle fundus imaging and compensating for fundus refractive errors in real time during fundus imaging, in order to address the technical defects of the prior art fundus scanning imaging.

[0006] To solve the above problems, this application adopts the following technical solutions:

[0007] One of the purposes of the present application is to provide a wide-line scanning fundus imaging system, comprising: an illumination optical path, an imaging optical path and a control system, wherein:

[0008] The illumination optical path includes an LED light source, a condenser, an illumination slit, an illumination lens, a one-dimensional scanning galvanometer, a reflector, a scanning lens and an eyepiece objective lens; the imaging optical path includes the eyepiece objective lens, the scanning lens, the reflector, an aperture, an imaging objective lens and a camera; the control system includes a control device, a first driving unit and a second driving unit;

[0009] The LED light source is irradiated onto the illumination slit through the condenser, and the linear light beam emitted from the illumination slit propagates forward through the illumination lens and enters the one-dimensional scanning galvanometer, is reflected by the one-dimensional scanning galvanometer and enters the reflector, and then is reflected by the reflector and enters the scanning lens to form a wide-line illumination beam at the intermediate image plane P, and the wide-line illumination beam enters the eyepiece objective lens, and then enters the pupil of the human eye, and forms a wide-line illumination area at the fundus after passing through the human eye and the eyepiece objective lens, and forms an intermediate image plane of the retina at the intermediate image plane P after passing through the human eye and the eyepiece objective lens, and the intermediate image plane is incident into the diaphragm after passing through the scanning lens and the reflector, and enters the imaging objective lens after being emitted from the diaphragm, and is focused by the imaging objective lens to form an image at the photosensitive surface of the camera;

[0010] The control device can control the switching and power adjustment of the LED light source, as well as the exposure and data transmission of the camera, and according to the refractive error of the eye to be inspected, control the first drive unit to drive the illumination lens to move forward and backward along the optical axis, and control the second drive unit to drive the camera to move forward and backward along the optical axis.

[0011] In some of the embodiments, the one-dimensional scanning galvanometer and the aperture are located at a conjugate position of the pupil of the eye to be inspected after passing through the eyepiece objective and the scanning lens. The light beam is split into an illumination beam and a detection beam at this position. The one-dimensional scanning galvanometer is located in the illumination beam, and the aperture is located in the detection beam.

[0012] In some of the embodiments, the position R of the retina of the human eye, the image plane position P of the eyepiece objective lens, the slit position S1 of the illumination slit, and the photosensitive surface position I of the camera are located at optically conjugate positions.

[0013] In some of the embodiments, the camera is a wide-field area array camera, and the camera and the retina are located at imaging conjugate positions.

[0014] In some of the embodiments, different areas on the retina are sequentially illuminated by the wide line beam light to form strip-shaped fundus illumination areas, which are sequentially imaged on different areas on the photosensitive surface of the camera. The control device sequentially reads the strip-shaped area pixel information containing the fundus effective illumination area information on the photosensitive surface of the camera. In one scanning cycle of the one-dimensional scanning galvanometer, the wide line beam light sequentially illuminates the entire imaging area of ​​the fundus. The control device obtains the pixel information of all the strip areas of the camera through image reconstruction to obtain an ultra-wide-angle image of the fundus.

[0015] In some embodiments, for emmetropia, assuming that the fundus of the human eye forms an intermediate image plane at position P0 through the eye contact objective lens, the control device controls the first driving unit to move the illumination lens along the optical axis, and moves the illumination lens to position L0, so that the intermediate image plane position P0 of the fundus is imaged at the slit position S1 of the illumination slit after passing through the scanning lens, the reflector, the one-dimensional scanning galvanometer, and the illumination lens; at the same time, the control device controls the second driving unit to move the camera along the optical axis, and moves the camera to position I0, so that the intermediate image plane position P0 of the fundus is imaged at the photosensitive surface of the camera after passing through the scanning lens, the reflector, the diaphragm, and the imaging objective lens;

[0016] For myopia, the intermediate image plane of the fundus of the human eye formed after passing through the eye contact objective lens is closer to one side of the eye contact objective lens, which is recorded as position P1. The control device drives the illuminating lens to move along the optical axis in a direction close to the illumination slit, and moves to position L1, so that the intermediate image plane position P1 of the fundus is imaged at the slit position S1 of the illumination slit after passing through the scanning lens, the reflector, the one-dimensional scanning galvanometer, and the illumination lens; at the same time, the control device controls the second driving unit to move the camera along the optical axis, and moves the camera in a direction close to the imaging objective lens, and moves it to position I1, so that the intermediate image plane position P1 of the fundus is imaged at the photosensitive surface of the camera after passing through the scanning lens, the reflector, the diaphragm, and the imaging objective lens;

[0017] For hyperopia, the intermediate image plane of the fundus of the human eye formed after passing through the eye-contacting objective lens is further away from one side of the eye-contacting objective lens, which is recorded as position P2. The control device drives the illuminating lens to move along the optical axis in a direction away from the illumination slit to position L2, so that the intermediate image plane position P2 of the fundus is imaged at the slit position S1 of the illumination slit after passing through the scanning lens, the reflector, the one-dimensional scanning galvanometer, and the illumination lens; at the same time, the control device controls the second driving unit to move the camera along the optical axis, moves the camera in a direction away from the imaging objective lens, and moves it to position I2, so that the intermediate image plane position P2 of the fundus is imaged at the photosensitive surface of the camera after passing through the scanning lens, the reflector, the aperture, and the imaging objective lens.

[0018] The second object of the present application is to provide an imaging method of the wide line scanning fundus imaging system, comprising the following steps:

[0019] The LED light source is irradiated onto the illumination slit through the condenser, and the linear light beam emitted from the illumination slit propagates forward through the illumination lens and enters the one-dimensional scanning galvanometer, is reflected by the one-dimensional scanning galvanometer and enters the reflector, and then is reflected by the reflector and enters the scanning lens to form a wide-line illumination beam at the intermediate image plane P, and the wide-line illumination beam enters the eyepiece objective lens, and then enters the pupil of the human eye, and forms a wide-line illumination area at the fundus after passing through the human eye and the eyepiece objective lens, and the wide-line illumination area of ​​the fundus forms an intermediate image plane of the retina at the intermediate image plane P after passing through the human eye and the eyepiece objective lens, and the intermediate image plane is incident into the aperture after passing through the scanning lens and the reflector, and enters the imaging objective lens after being emitted from the aperture, and is focused by the imaging objective lens to form an image on the photosensitive surface of the camera.

[0020] This application adopts the above technical solution, and its beneficial effects are as follows:

[0021] The wide-line scanning fundus imaging system and imaging method provided in the present application use a wide linear light beam to illuminate the fundus, and realize illumination and image data collection of a strip-shaped area of ​​the fundus at a time. A strip-shaped fundus area contains multiple rows of pixels on the camera, which is different from traditional line scanning confocal fundus imaging that only obtains pixel information of one or a few rows of the fundus at a time, thereby increasing the exposure time of the fundus image on the camera and improving the imaging signal-to-noise ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the structure of a wide-line scanning fundus imaging system provided in an embodiment of the present application.

[0024] Figure 2 A schematic diagram of the control method of the control system under different situations provided in the embodiment of the present application. DETAILED DESCRIPTION

[0025] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0026] In the description of the present application, it should be understood that the terms "upper", "lower", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] See also Figure 1 The wide-line scanning fundus imaging system provided in the embodiment of the present application includes: an illumination optical path 10, an imaging optical path 20 and a control system 30. The specific implementation of each component is described in detail below.

[0030] The illumination light path 10 includes an LED light source 11 , a condenser 12 , an illumination slit 13 , an illumination lens 14 , a one-dimensional scanning galvanometer 15 , a reflector 16 , a scanning lens 17 and an eyepiece objective 18 .

[0031] The imaging optical path 20 includes the eyepiece lens 18, the scanning lens 17, the reflector 16, the aperture 21, the imaging lens 22 and the camera 23. The control system 30 includes a control device 31, a first driving unit 32 and a second driving unit 33.

[0032] The control device 31 can control the switching and power adjustment of the LED light source 11, and control the exposure and data transmission of the camera 23, and according to the refractive error of the eye to be inspected, control the first driving unit 32 to drive the illumination lens 14 to move forward and backward along the optical axis, and control the second driving unit 33 to drive the camera 23 to move forward and backward along the optical axis.

[0033] The wide line scanning fundus imaging system provided in the above embodiment of the present application works as follows:

[0034] The LED light source 11 is irradiated onto the illumination slit 13 through the condenser 12. The linear light beam emitted from the illumination slit 13 propagates forward through the illumination lens 14 and enters the one-dimensional scanning galvanometer 15. It is reflected by the one-dimensional scanning galvanometer 15 and enters the reflector 16. It is then reflected by the reflector 16 and enters the scanning lens 17 to form a wide-line illumination beam at the intermediate image plane P. The wide-line illumination beam enters the eyepiece objective 18 and then enters the pupil of the human eye. After passing through the human eye refractive system, a wide-line illumination area is formed at the fundus. The wide-line illumination area of ​​the fundus forms an intermediate image plane of the retina at the intermediate image plane P after passing through the human eye and the eyepiece objective 18. The intermediate image plane is incident on the diaphragm 21 after passing through the scanning lens 17 and the reflector 16. After being emitted from the diaphragm 21, it enters the imaging objective 22 and is focused by the imaging objective 22 to form an image on the photosensitive surface of the camera 23.

[0035] It can be understood that the above embodiment of the present application divides the light beam into an illumination light beam region and an imaging detection light beam region in the entrance pupil region of the scanning lens 17, which can better suppress stray light caused by the scanning lens 17, the eyepiece objective 18, the human cornea, etc. when imaging the fundus. The one-dimensional scanning galvanometer 15 is located in the illumination light beam region, so that different regions of the fundus retina are sequentially illuminated by strip-shaped light beams. The aperture 21 is located in the imaging detection light beam region, and the illuminated strip-shaped regions on the fundus retina are sequentially imaged on different regions on the photosensitive surface of the camera 23. The imaging optical path adopts a non-de-scanning method and uses a planar array camera. Compared with the traditional de-scanning line scanning confocal imaging using a linear array camera, there are more camera models to choose from.

[0036] In this embodiment, the one-dimensional scanning galvanometer 15 and the aperture 21 are located at a conjugate position of the pupil of the eye to be inspected after passing through the eye contact lens 18 and the scanning lens 17. The light beam is split into an illumination beam and a detection beam at this position. The one-dimensional scanning galvanometer 15 is located in the illumination beam, and the aperture 21 is located in the detection beam. This optical path setting eliminates stray light caused by reflection or scattering of the scanning lens 17, the eye contact lens 18, and the human cornea.

[0037] In this embodiment, the retina position R of the human eye, the image plane position P of the eyepiece objective lens 18, the slit position S1 of the illumination slit 13, and the photosensitive surface position I of the camera 23 are located at optically conjugate positions.

[0038] Specifically, the linear light beam emitted from the illumination slit 13 passes through the illumination lens 14, the one-dimensional scanning galvanometer 15, the reflector 16, the eyepiece objective lens 18, and the human eye refractive system, and then forms a wide linear beam illumination area in the fundus retinal area. As the one-dimensional scanning galvanometer 15 swings, the wide linear beam illumination area of ​​the fundus also moves along, that is, different areas of the retina are illuminated by strip-shaped light beams in sequence. The light beam reflected from the fundus passes through the eyepiece objective lens 18, the scanning lens 17, and the reflector 16, and then no longer enters the one-dimensional scanning galvanometer 15, but directly enters the subsequent aperture 21 and the imaging objective lens 22, and forms an image on the camera 23, that is, a non-decoding scanning method is adopted. The camera 23 adopts a wide-field array camera, the camera 23 and the retina are located at imaging conjugate positions, different areas on the retina are illuminated by wide line beam light in sequence, forming strip-shaped fundus illumination areas, which are imaged in sequence on different areas of the photosensitive surface of the camera 23, and the control device 31 sequentially reads the strip-shaped area pixel information containing the fundus effective illumination area information on the photosensitive surface of the camera 23. In one scanning cycle of the one-dimensional scanning galvanometer 15, the wide line beam light sequentially illuminates the entire imaging area of ​​the fundus. The control device 31 can obtain an ultra-wide-angle image of the fundus through image reconstruction based on the acquired pixel information of all strip areas of the camera 23.

[0039] See also Figure 2 , which is the control method of controlling the system under different circumstances provided by this embodiment.

[0040] For an emmetropic eye, assuming that the fundus of the human eye forms an intermediate image plane at the P0 position through the eye-contacting objective lens 18, the control device 31 controls the first driving unit 32 to move the illumination lens 14 along the optical axis, and moves the illumination lens 14 to the position L0, so that the intermediate image plane position P0 of the fundus is imaged at the slit position S1 of the illumination slit 13 after passing through the scanning lens 17, the reflector 16, the one-dimensional scanning galvanometer 15, and the illumination lens 14; at the same time, the control device 31 controls the second driving unit 33 to move the camera 23 along the optical axis, and moves the camera 23 to the position I0, so that the intermediate image plane position P0 of the fundus is imaged at the photosensitive surface of the camera 23 after passing through the scanning lens 17, the reflector 16, the aperture 21, and the imaging objective lens 22.

[0041] For myopia, the intermediate image plane of the fundus of the human eye formed after passing through the eye-contacting objective lens 18 is closer to one side of the eye-contacting objective lens 18, which is recorded as position P1. The control device 31 drives the illuminating lens 14 to move along the optical axis in the direction close to the illumination slit 14, and moves to position L1, so that the intermediate image plane position P1 of the fundus is imaged at the slit position S1 of the illumination slit 13 after passing through the scanning lens 17, the reflector 16, the one-dimensional scanning galvanometer 15, and the illumination lens 14; at the same time, the control device 31 controls the second driving unit 33 to move the camera 23 along the optical axis, and moves the camera 23 in the direction close to the imaging objective lens 22, and moves it to position I1, so that the intermediate image plane position P1 of the fundus is imaged at the photosensitive surface of the camera 23 after passing through the scanning lens 17, the reflector 16, the aperture 23, and the imaging objective lens 22.

[0042] For hyperopia, the intermediate image plane of the fundus of the human eye formed after passing through the eye-contacting objective lens 18 is further away from the side of the eye-contacting objective lens 18, which is recorded as position P2. The control device 31 drives the illuminating lens 14 to move along the optical axis in the direction away from the illumination slit 13, and moves to position L2, so that the intermediate image plane position P2 of the fundus is imaged at the slit position S1 of the illumination slit 13 after passing through the scanning lens 17, the reflector 16, the one-dimensional scanning galvanometer 15, and the illumination lens 14; at the same time, the control device 31 controls the second driving unit 33 to move the camera 23 along the optical axis, and moves the camera 23 in the direction away from the imaging objective lens 22, and moves it to position I2, so that the intermediate image plane position P2 of the fundus is imaged at the photosensitive surface of the camera 23 after passing through the scanning lens 17, the reflector 16, the aperture 21, and the imaging objective lens 22.

[0043] The wide-line scanning fundus imaging system provided in the present application uses a wide linear light beam to illuminate the fundus, and realizes illumination and image data collection of a strip-shaped area of ​​the fundus at a time. A strip-shaped fundus area contains multiple rows of pixels on the camera, which is different from traditional line scanning confocal fundus imaging that only obtains pixel information of one or a few rows of the fundus at a time. The purpose of this is to increase the exposure time of the fundus image on the camera and improve the imaging signal-to-noise ratio.

[0044] It can be understood that the technical features of the above-described embodiments can be arbitrarily combined. In order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above are only preferred embodiments of the present application, and only specifically describe the technical principles of the present application. These descriptions are only for explaining the principles of the present application and cannot be interpreted as limiting the scope of protection of the present application in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application, and other specific implementation methods of the present application that can be associated with the technicians in this field without creative work, should be included in the scope of protection of the present application.

Claims

1. A wide-line scanning fundus imaging system, characterized in that: include: Illumination optical path, imaging optical path and control system, including: The illumination optical path includes an LED light source, a condenser, an illumination slit, an illumination lens, a one-dimensional scanning galvanometer, a reflector, a scanning lens and an eyepiece objective lens; the imaging optical path includes the eyepiece objective lens, the scanning lens, the reflector, an aperture, an imaging objective lens and a camera; the control system includes a control device, a first drive unit and a second drive unit; the control device can control the switching of the LED light source and the adjustment of the power, and control the exposure and data transmission of the camera, and according to the refractive error of the eye to be inspected, control the first drive unit to drive the illumination lens to move forward and backward along the optical axis, and control the second drive unit to drive the camera to move forward and backward along the optical axis; The LED light source is irradiated onto the illumination slit through the condenser, and the linear light beam emitted from the illumination slit propagates forward through the illumination lens and enters the one-dimensional scanning galvanometer, is reflected by the one-dimensional scanning galvanometer and enters the reflector, and then is reflected by the reflector and enters the scanning lens to form a wide-line illumination beam at the intermediate image plane P, and the wide-line illumination beam enters the eyepiece objective lens, and then enters the pupil of the human eye, and forms a wide-line illumination area at the fundus after passing through the human eye and the eyepiece objective lens, and the wide-line illumination area of ​​the fundus forms an intermediate image plane of the retina at the intermediate image plane P after passing through the human eye and the eyepiece objective lens, and the intermediate image plane is incident into the aperture after passing through the scanning lens and the reflector, and enters the imaging objective lens after being emitted from the aperture, and is focused by the imaging objective lens to form an image on the photosensitive surface of the camera.

2. The wide line scanning fundus imaging system according to claim 1, characterized in that: The one-dimensional scanning galvanometer and the diaphragm are located at a conjugate position of the pupil of the eye to be inspected after passing through the eyepiece objective and the scanning lens. The light beam is split into an illumination beam and a detection beam at this position. The one-dimensional scanning galvanometer is located in the illumination beam, and the diaphragm is located in the detection beam.

3. The wide line scanning fundus imaging system according to claim 1, characterized in that: The position R of the retina of the human eye, the position P of the image plane of the eyepiece objective lens, the slit position S1 of the illumination slit, and the position I of the photosensitive surface of the camera are located at optically conjugate positions.

4. The wide line scanning fundus imaging system according to claim 1, characterized in that: The camera is a wide-field array camera, and the camera and the retina are located at imaging conjugate positions.

5. The wide line scanning fundus imaging system according to claim 4, characterized in that: Different areas on the retina are sequentially illuminated by the wide line beam light to form strip-shaped fundus illumination areas, which are sequentially imaged on different areas on the photosensitive surface of the camera. The control device sequentially reads the strip-shaped area pixel information containing the fundus effective illumination area information on the photosensitive surface of the camera. In one scanning cycle of the one-dimensional scanning galvanometer, the wide line beam light sequentially illuminates the entire imaging area of ​​the fundus. The control device obtains the pixel information of all the strip areas of the camera and reconstructs the image to obtain an ultra-wide-angle image of the fundus.

6. The wide line scanning fundus imaging system according to claim 1, characterized in that: For an emmetropic eye, assuming that the fundus of the human eye forms an intermediate image plane at the position P0 through the eye contact objective lens, the control device controls the first driving unit to move the illumination lens along the optical axis, and moves the illumination lens to the position L0, so that the intermediate image plane position P0 of the fundus is imaged at the slit position S1 of the illumination slit after passing through the scanning lens, the reflector, the one-dimensional scanning galvanometer, and the illumination lens; at the same time, the control device controls the second driving unit to move the camera along the optical axis, and moves the camera to the position I0, so that the intermediate image plane position P0 of the fundus is imaged at the photosensitive surface of the camera after passing through the scanning lens, the reflector, the diaphragm, and the imaging objective lens; For myopia, the intermediate image plane of the fundus of the human eye formed after passing through the eye contact objective lens is closer to one side of the eye contact objective lens, which is recorded as position P1. The control device drives the illuminating lens to move along the optical axis in a direction close to the illumination slit, and moves to position L1, so that the intermediate image plane position P1 of the fundus is imaged at the slit position S1 of the illumination slit after passing through the scanning lens, the reflector, the one-dimensional scanning galvanometer, and the illumination lens; at the same time, the control device controls the second driving unit to move the camera along the optical axis, and moves the camera in a direction close to the imaging objective lens, and moves it to position I1, so that the intermediate image plane position P1 of the fundus is imaged at the photosensitive surface of the camera after passing through the scanning lens, the reflector, the diaphragm, and the imaging objective lens; For hyperopia, the intermediate image plane of the fundus of the human eye formed after passing through the eye-contacting objective lens is further away from one side of the eye-contacting objective lens, which is recorded as position P2. The control device drives the illuminating lens to move along the optical axis in a direction away from the illumination slit to position L2, so that the intermediate image plane position P2 of the fundus is imaged at the slit position S1 of the illumination slit after passing through the scanning lens, the reflector, the one-dimensional scanning galvanometer, and the illumination lens; at the same time, the control device controls the second driving unit to move the camera along the optical axis, moves the camera in a direction away from the imaging objective lens, and moves it to position I2, so that the intermediate image plane position P2 of the fundus is imaged at the photosensitive surface of the camera after passing through the scanning lens, the reflector, the aperture, and the imaging objective lens.

7. An imaging method of the wide line scanning fundus imaging system according to claim 1, characterized in that: The steps include: The LED light source is irradiated onto the illumination slit through the condenser, and the linear light beam emitted from the illumination slit propagates forward through the illumination lens and enters the one-dimensional scanning galvanometer, is reflected by the one-dimensional scanning galvanometer and enters the reflector, and then is reflected by the reflector and enters the scanning lens to form a wide-line illumination beam at the intermediate image plane P, and the wide-line illumination beam enters the eyepiece objective lens, and then enters the pupil of the human eye, and forms a wide-line illumination area at the fundus after passing through the human eye and the eyepiece objective lens, and the wide-line illumination area of ​​the fundus forms an intermediate image plane of the retina at the intermediate image plane P after passing through the human eye and the eyepiece objective lens, and the intermediate image plane is incident into the aperture after passing through the scanning lens and the reflector, and enters the imaging objective lens after being emitted from the aperture, and is focused by the imaging objective lens to form an image on the photosensitive surface of the camera.

Images