CN213097815U - Fundus camera with coaxial illumination light source and fixation light source - Google Patents

Abstract

The utility model discloses a light source and fixed coaxial eye ground camera of light source of looking, including fuselage optical assembly, ophthalmoscope optical assembly and eyes, fuselage optical assembly includes photosensitive element and fixed sight banks spare, photosensitive element is used for acquireing the image of the eye ground, fixed sight banks spare is used for guiding the measurand to carry out the formation of image of eye ground, and fixed sight banks spare includes that the center is fixed sight lamp luminescence unit and edge is fixed sight lamp luminescence unit, ophthalmoscope optical assembly includes first battery of lens, second battery of lens, third battery of lens, incident polaroid, beam splitter, emergent polaroid, light source subassembly. The fundus camera with the illumination light source coaxial with the fixation light source prevents stray light generated by the illumination light source from entering a subsequent imaging light path to a photosensitive element and also prevents the stray light generated by the fixation light source from entering the subsequent imaging light path to the photosensitive element, and only depolarized diffuse reflection light in a fundus region can pass through the emergent polaroid.

Description

Fundus camera with coaxial illumination light source and fixation light source

Technical Field

The utility model relates to an eye ground camera field specifically is an illumination light source and the coaxial eye ground camera of solid sight light source.

Background

Fundus photography is a diagnosis item widely used in ophthalmology, the blood vessels of the fundus are the only blood vessels which can be directly observed by the human body through the body surface, a fundus camera is adopted, a doctor can check whether pathological changes exist in optic nerves, retina, choroid and refraction medium of the fundus, and diagnosis and disease condition judgment can be carried out on other system diseases such as cerebral infarction, cerebral hemorrhage, cerebral arteriosclerosis, brain tumor, diabetes, nephropathy, hypertension and the like with the assistance of the fundus camera.

Traditional desk-top fundus camera includes complicated lighting system and observation system, and the volume is huge, and system architecture is complicated, and some instruments need install specific software on the computer just can use, and the machine itself does not possess the image storage function, and some can't break away from the computer autonomous working even, if need the picture, then need patient to shoot the fundus picture before the instrument, and very inconvenient to special patient, like the bed patient to the hospital, perhaps all extremely inconvenient to the patient in marginal mountain area.

The handheld eye fundus camera is small in size and convenient to carry, does not need to carry out mydriasis on a person to be inspected, can be used for simply, quickly and accurately inspecting, and particularly provides convenience for eye fundus inspection of bedridden patients and remote mountain patients.

The fundus camera consists of an illumination light path, a fixation lamp light path and an imaging light path, wherein the illumination light path is responsible for uniformly illuminating a fundus area so that the imaging light path can acquire a clear image; the vision fixation lamp light path guides the tested person to rotate the eyeballs to a proper position so that the imaging light path can acquire images required by the eyeground and prevent the eyeballs from rotating in the image acquisition process; the imaging optical path is responsible for imaging the fundus region to the photosensitive element. The illumination light path of the prior handheld fundus camera is separated from the fixation light path; in addition, the fixation light path of some fundus cameras is arranged in a fundus lens belonging to the fundus camera and cannot be focused according to the diopter of the eyeball of the measured person; also the fixation light path of the fundus camera is through the entire imaging light path, which introduces stray light.

In the existing fundus camera, a light source of a fixation lamp is led in through an imaging light path, stray light is led in from a conjugated position of a photosensitive element through the whole imaging light path, and a small round point is formed in the middle of an acquired image and is the fixation lamp; in some existing fundus cameras, a fixation lamp light source is led in through an external optical path, and the fixation lamp light source is installed in a fundus mirror, is not in a conjugate relation with a photosensitive element, and cannot be focused together with the photosensitive element.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Aiming at the defects of the prior art, the utility model provides an eyeground camera with an illuminating light source and a fixation light source which are coaxial, the fundus camera with the illumination light source coaxial with the fixation light source integrates the illumination light path and the fixation light path on one light path, the light paths are coaxial and are led in through an external light path of the ophthalmoscope, the fixation light path penetrates through the center of the illumination light path, the illumination light source and the fixation light source are changed into linearly polarized light after passing through the incidence polaroid, the emergent polaroid can block stray light (the stray light reflected by the ocular lens and the cornea is still linearly polarized light) incident to the ocular lens and the cornea out of a subsequent imaging light path, the stray light generated by the illumination light source is prevented from entering the subsequent imaging light path to a photosensitive element, the stray light generated by the fixation light source is prevented from entering the subsequent imaging light path to the photosensitive element, and only the depolarized diffuse reflected light in a fundus area can pass through the emergent polaroid.

(II) technical scheme

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: an eyeground camera with an illuminating light source and a fixation light source coaxial comprises an optical body assembly, an ophthalmoscope optical assembly and eyes, wherein the optical body assembly comprises a photosensitive element and a fixation light assembly, the photosensitive element is used for acquiring images of eyeground, the fixation light assembly is used for guiding a measured person to perform eyeground imaging, the fixation light assembly comprises a central fixation light emitting unit and an edge fixation light emitting unit, the ophthalmoscope optical assembly comprises a first lens group, a second lens group, a third lens group, an incident polaroid, a beam splitter, an emergent polaroid, an illuminating light source assembly, a fixation light reflecting lens, a fixation light collimating lens and a fixation light source assembly, the ophthalmoscope is external, the illuminating light comprises a near infrared light emitting unit and a visible light emitting unit, and the eyes comprise cornea, aqueous humor, pupils, crystalline lenses, a vitreous body and eyeground, the light sensing element and the fixation lamp assembly are in a conjugate relation with each other, can be integrated together and can be focused simultaneously, the fixation lamp can also be arranged outside the ophthalmoscope, a light source of the fixation lamp assembly is guided into the fundus of a measured person through a fixation lamp collimating lens, a fixation lamp reflecting mirror, a beam splitter and a first lens group, the beam splitter is positioned between the first lens group and a third lens group, the fixation lamp collimating lens is used for collimating a fixation lamp light source, the fixation lamp reflecting lens is used for reflecting the collimated fixation lamp light source to an emergent polaroid and making the light into linearly polarized light to be incident on the beam splitter, and the beam splitter can be a common beam splitter, such as a flat glass beam splitter, a prism or other types of beam splitters. The exit polaroid is used for filtering a fixation lamp light source and an illumination light source into linearly polarized light, the illumination light source of the illumination light source assembly comprises a near-infrared light emitting unit and a visible light emitting unit, and the light beams are sequentially incident on the exit polaroid and the beam splitter in a mode of deviating from an illumination light path and a fixation lamp light path light axis, the first lens group, the second lens group and the third lens group form an imaging lens group for imaging a fundus image to the photosensitive element, and the incident polaroid is used for blocking the linearly polarized light reflected back outside the imaging light path group and allowing depolarized light diffusely reflected back from the fundus to pass through the imaging light path group and finally be incident on the photosensitive element.

Preferably, the vision fixation lamp assembly comprises one or more light emitting units, which may be LEDs (light emitting diodes) or LDs (laser diodes), or other light emitting devices.

Preferably, the illumination light source assemblies may each include one or more LEDs (light emitting diodes) and LDs (laser diodes), or other light emitting devices.

Preferably, the illumination source may be directly incident (uncollimated) on the exit polarizer or collimated and incident on the exit polarizer.

Preferably, the illumination light sources of the illumination light source assembly may be symmetrically and annularly arranged or asymmetrically arranged off-axis around the optical axis of the illumination light path and the optical axis of the fixed-view lamp light path, and the illumination light sources may become diffuse reflection light sources.

Preferably, the polarization directions of the exit polarizer and the incident polarizer are perpendicular to each other.

Preferably, the fundus camera further comprises an image processing and storing module for processing and storing the fundus image or video collected by the photosensitive element.

Preferably, the fundus camera further comprises a display module for displaying the fundus image or video acquired by the photosensitive element.

Preferably, the fundus camera further comprises a communication and power interface for connecting components of the fundus camera, including data transfer and power input and output.

(III) advantageous effects

The utility model provides an illumination light source and the coaxial eye ground camera of solid sight light source possesses following beneficial effect:

the utility model discloses with illumination light path and the light path integration of looking firmly at a light path, the light path is coaxial, the external light path through the ophthalmoscope is leading-in, the light path of looking firmly passes the center of illumination light path, illumination light source and the light source of looking firmly all become the linear polarization behind the incident polaroid, the emergence polaroid can be with incidenting into the eyepiece, the stray light on the cornea (the eyepiece, the stray light that reflects on the cornea still is the linear polarization) all keep off outside follow-up imaging light path, the stray light that has both avoided illumination light source to produce gets into follow-up imaging light path until photosensitive element, the stray light that has also avoided the light source of looking firmly to produce gets into follow-up imaging light path until photosensitive element, and the diffuse reflection light of only the regional depolarization of eyeground;

because the human eyes have the problem of myopia or hypermetropia (diopter is not correct), the fixation lamp light source needs to provide different focal lengths for different testees, the fixation lamp light source and the photosensitive element can be designed at conjugated positions and can be in linkage focusing, and when the eye fundus region forms a clear image on the photosensitive element, the human eyes can also clearly see the fixation lamp light source. Of course, for some situations where the diopter requirement of the subject is not high, the fixation lamp light source may be installed on the external optical path of the ophthalmoscope to which the fundus camera belongs.

Drawings

Fig. 1 is a schematic view of an optical path of an eye fundus camera according to an embodiment of the present invention.

Fig. 2 is a 3D view of the optical path of the fundus camera according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of an arrangement of 5 fixation lamp light-emitting units according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of an arrangement of 7 fixation lamp light-emitting units according to an embodiment of the present invention.

Fig. 5 is a schematic view illustrating an observable range of the fixation lamp assembly according to an embodiment of the present invention.

Fig. 6 is a schematic view illustrating an observable range of the fixation lamp assembly according to an embodiment of the present invention.

Fig. 7 is a schematic view of the optical path of the light source assembly of the eye fundus camera fixation lamp in the eye fundus scope according to an embodiment of the present invention.

Fig. 8 is a 3D view of the optical path of the light source assembly of the fundus camera fixation lamp in the fundus scope according to an embodiment of the present invention.

Fig. 9 is a schematic diagram of one arrangement of light emitting units according to an embodiment of the present invention.

Fig. 10 is a schematic view of an asymmetric arrangement of light emitting units according to an embodiment of the present invention;

in the figure: 1. a body optical assembly; 11. a photosensitive element; 12. a vision fixation lamp assembly; 12a, a central fixation lamp light-emitting unit; 12b, an edge fixation lamp light-emitting unit; 2. a funduscopic optical component; 21. a first lens group; 22. a second lens group; 23. a third lens group; 24. an emergent polarizing plate; 25. a beam splitter; 26. an incident polarizing plate; 27. an illumination light source assembly; 27a, a near-infrared light emitting unit; 27b, a visible light emitting unit; 28. a fixation lamp reflecting lens; 29. a fixation lamp collimating lens; 30. the ophthalmoscope of the fixation lamp light source component is arranged outside; 3. an eye; 31. a cornea; 32. aqueous humor; 33. a pupil; 34. a lens; 35. a glass body; 36. fundus oculi; l1, illumination source; l2, diffuse reflection light source.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-10, the present invention provides a technical solution: an illumination light source and a fixation light source are coaxial, a body optical assembly 1 comprises a photosensitive element 11 and a fixation lamp assembly 12 (the fixation lamp assembly 12 comprises 1 central fixation lamp light-emitting unit 12a and 0 plurality of edge fixation lamp light-emitting units 12 b); the ophthalmoscope optical assembly 2 includes a first lens group 21, a second lens group 22, a third lens group 23, an incident polarizing plate 26, a beam splitter 25, an exit polarizing plate 24, an illumination light source assembly 27 (a near-infrared light emitting unit 27a, a visible light emitting unit 27b), a fixation lamp reflecting lens 28, and a fixation lamp collimating lens 29;

the polarization directions of the incident polarizer 26 and the exit polarizer 24 are orthogonal to each other;

the photosensitive element 11 may be a CCD or CMOS;

the photosensitive element 11 and the vision fixing lamp assembly 12 are integrated together and have conjugate relation with each other, and can focus for testees with different diopters at the same time;

the fixation lamp light source assembly 20 is used for providing fixation light which is incident via the fixation lamp collimating lens 29, the beam splitter 25 and the first lens group 21 and is imaged on the fundus 36 of the eye 3;

the vision fixation lamp assembly 12 comprises a central vision fixation lamp light-emitting unit 12a and 0 or a plurality of edge vision fixation lamp light-emitting units 12b, wherein the edge vision fixation lamp light-emitting units 12b surround the central vision fixation lamp light-emitting unit 12a and are circularly and symmetrically arranged; FIG. 5 shows the range of the subject to be observed by the operator after the subject is guided by the vision fixation lamp assembly 12 shown in FIG. 3; as shown in fig. 5, if the subject looks at the central fixation lamp light emitting unit 12a, the observation range of the operator is only the central observation range R1; if the eye 3 of the tested person is guided to rotate to a specific direction through the vision fixing light, the observable range of the operator is expanded to the edge range R2; it is understood that the images obtained by rotating the eyes 3 to different directions can be synthesized into a larger image, as shown in the outer frame of fig. 5; FIG. 6 shows the range of the subject to be observed by the operator after the subject is guided by the vision fixation lamp assembly 12 shown in FIG. 4;

as shown in fig. 8 and 9, for some occasions with low diopter adjustment requirements for the eyes 3, the external ophthalmoscope 30 of the fixation lamp light source assembly can also be installed in the ophthalmoscope optical assembly 2 to be fixed and fixed, and does not focus with the photosensitive element 11;

the near-infrared light emitting unit 27a and the visible light emitting unit 27b may be LEDs (light emitting diodes) or LDs (laser diodes);

the plurality of near-infrared light emitting units 27a and the visible light emitting units 27b are arranged around the illumination optical path and the fixation lamp optical path optical axis OA1, as shown in fig. 10, the plurality of near-infrared light emitting units 27a are first turned on, first pass through the exit polarizer 24 to become linearly polarized light in a manner of deviating from the illumination optical path and the fixation lamp optical axis OA1, then enter the first lens group 21 in a manner of deviating from the imaging optical axis OA2, then sequentially pass through the first lens group 21, the cornea 31, the aqueous humor 32, the pupil 33, the crystalline lens 34 and the vitreous body 35, and finally irradiate the fundus 36 of the eye 3;

the near-infrared illumination light source L1 converged on the fundus 36 becomes a diffuse reflection light source L2, becomes partially depolarized light, then sequentially passes through the vitreous body 35, the crystalline lens 34, the pupil 33, the aqueous humor 32, the cornea 31 and the first lens group 21, and is incident on the incident polarizer 26, only the completely depolarized or partially depolarized light can pass through the incident polarizer 26, and then sequentially passes through the second lens group 22 and the third lens group 23, and finally reaches the photosensitive element 11, so that most of stray light can be cut off from the incident polarizer 26, and the signal-to-noise ratio of the photosensitive element 11 is greatly improved;

when the image from the fundus 36 is acquired by the photosensitive element 11, which may be unclear, the photosensitive element 11 may be manually or automatically focused until a relatively clear image is obtained, the visible light emitting unit 27b is immediately started, and first passes through the exit polarizer 24 to become linearly polarized light in a manner of deviating from the optical path of the illumination light and the optical axis OA1 of the fixation light, then enters the first lens group 21 in a manner of deviating from the optical axis OA2, and finally reaches the fundus 36 of the eye 3 after passing through the first lens group 21, the cornea 31, the aqueous humor 32, the pupil 33, the crystalline lens 34 and the vitreous body 35 in sequence;

the illumination light source L1 converged on the fundus 36 becomes a diffuse reflection light source L2, becomes partially depolarized light, then sequentially passes through the vitreous body 35, the crystalline lens 34, the pupil 33, the aqueous humor 32, the cornea 31 and the first lens group 21, and is incident on the incident polarizer 26, only the completely depolarized light or the partially polarized light can pass through the incident polarizer 26, and then sequentially passes through the second lens group 22 and the third lens group 23, and finally reaches the photosensitive element 11 to form required image information, so that most of stray light can be cut off outside the incident polarizer 26, and the signal-to-noise ratio of the photosensitive element 11 is greatly improved.

The fixation lamp assembly 12 includes one or more light emitting units, which may be LEDs (light emitting diodes) or LDs (laser diodes), or other light emitting devices; the illumination source modules 27 may each include one or more LEDs (light emitting diodes) and LDs (laser diodes), or other light emitting devices; the illumination source L1 may be directly incident (uncollimated) on the exit polarizer 24 or collimated and incident on the exit polarizer 24; the illumination light sources L1 can be symmetrically and annularly arranged or asymmetrically arranged in an off-axis way around the optical axis of the illumination light path and the fixed-vision light path; the polarization directions of the exit polarizer 24 and the entrance polarizer 26 are perpendicular to each other; the fundus camera also comprises an image processing and storing module which is used for processing and storing fundus images or videos acquired by the photosensitive element 11; the fundus camera also comprises a display module used for displaying fundus images or videos collected by the photosensitive element 11; the fundus camera also includes communication and power interfaces for connecting the components of the fundus camera, including data transfer and power input and output.

In summary, in the fundus camera with the illumination light source and the fixation light source coaxial, the optical assembly 1 includes a photosensitive element 11 and a fixation light assembly 12 (the fixation light assembly 12 includes 1 central fixation light emitting unit 12a and 0 or several edge fixation light emitting units 12 b); the ophthalmoscope optical assembly 2 includes a first lens group 21, a second lens group 22, a third lens group 23, an incident polarizing plate 26, a beam splitter 25, an exit polarizing plate 24, an illumination light source assembly 27 (a near-infrared light emitting unit 27a, a visible light emitting unit 27b), a fixation lamp reflecting lens 28, and a fixation lamp collimating lens 29; the polarization directions of the incident polarizer 26 and the exit polarizer 24 are orthogonal to each other; the photosensitive element 11 may be a CCD or CMOS; the photosensitive element 11 and the vision fixing lamp assembly 12 are integrated together and have conjugate relation with each other, and can focus for testees with different diopters at the same time; the fixation lamp light source assembly 20 is used for providing fixation light which is incident via the fixation lamp collimating lens 29, the beam splitter 25 and the first lens group 21 and is imaged on the fundus 36 of the eye 3; the vision fixation lamp assembly 12 comprises a central vision fixation lamp light-emitting unit 12a and 0 or a plurality of edge vision fixation lamp light-emitting units 12b, wherein the edge vision fixation lamp light-emitting units 12b surround the central vision fixation lamp light-emitting unit 12a and are circularly and symmetrically arranged; FIG. 5 shows the range of the subject to be observed by the operator after the subject is guided by the vision fixation lamp assembly 12 shown in FIG. 3; as shown in fig. 5, if the subject looks at the central fixation lamp light emitting unit 12a, the observation range of the operator is only the central observation range R1; if the eye 3 of the tested person is guided to rotate to a specific direction through the vision fixing light, the observable range of the operator is expanded to the edge range R2; it is understood that the images obtained by rotating the eyes 3 to different directions can be synthesized into a larger image, as shown in the outer frame of fig. 5; FIG. 6 shows the range of the subject to be observed by the operator after the subject is guided by the vision fixation lamp assembly 12 shown in FIG. 4; as shown in fig. 8 and 9, for some occasions with low diopter adjustment requirements for the eyes 3, the external ophthalmoscope 30 of the fixation lamp light source assembly can also be installed in the ophthalmoscope optical assembly 2 and fixed without moving, and does not focus with the photosensitive element 11; the near-infrared light emitting unit 27a and the visible light emitting unit 27b may be LEDs (light emitting diodes) or LDs (laser diodes); the plurality of near-infrared light emitting units 27a and the visible light emitting units 27b are arranged around the illumination optical path and the fixation lamp optical path optical axis OA1, as shown in fig. 10, the plurality of near-infrared light emitting units 27a are first turned on, first pass through the exit polarizer 24 to become linearly polarized light in a manner of deviating from the illumination optical path and the fixation lamp optical axis OA1, then enter the first lens group 21 in a manner of deviating from the imaging optical axis OA2, then sequentially pass through the first lens group 21, the cornea 31, the aqueous humor 32, the pupil 33, the crystalline lens 34 and the vitreous body 35, and finally irradiate the fundus 36 of the eye 3; the near-infrared illumination light source L1 converged on the fundus 36 becomes a diffuse reflection light source L2, becomes partially depolarized light, then sequentially passes through the vitreous body 35, the crystalline lens 34, the pupil 33, the aqueous humor 32, the cornea 31 and the first lens group 21, and is incident on the incident polarizer 26, only the completely depolarized or partially depolarized light can pass through the incident polarizer 26, and then sequentially passes through the second lens group 22 and the third lens group 23, and finally reaches the photosensitive element 11, so that most of stray light can be cut off from the incident polarizer 26, and the signal-to-noise ratio of the photosensitive element 11 is greatly improved; when the image from the fundus 36 is acquired by the photosensitive element 11, which may be unclear, the photosensitive element 11 may be manually or automatically focused until a relatively clear image is obtained, the visible light emitting unit 27b is immediately started, and first passes through the exit polarizer 24 to become linearly polarized light in a manner of deviating from the optical path of the illumination light and the optical axis OA1 of the fixation light, then enters the first lens group 21 in a manner of deviating from the optical axis OA2, and finally reaches the fundus 36 of the eye 3 after passing through the first lens group 21, the cornea 31, the aqueous humor 32, the pupil 33, the crystalline lens 34 and the vitreous body 35 in sequence; the illumination light source L1 converged on the fundus 36 becomes a diffuse reflection light source L2, becomes partially depolarized light, then sequentially passes through the vitreous body 35, the crystalline lens 34, the pupil 33, the aqueous humor 32, the cornea 31 and the first lens group 21, and is incident on the incident polarizer 26, only the completely depolarized light or the partially polarized light can pass through the incident polarizer 26, and then sequentially passes through the second lens group 22 and the third lens group 23, and finally reaches the photosensitive element 11 to form required image information, so that most of stray light can be cut off outside the incident polarizer 26, and the signal-to-noise ratio of the photosensitive element 11 is greatly improved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. The utility model provides a coaxial eye ground camera of illumination light source and fixation light source, includes fuselage optical assembly, ophthalmoscope optical assembly and eyes, its characterized in that: the optical assembly of the machine body comprises a photosensitive element and a fixation lamp assembly, the photosensitive element is used for acquiring images of eyeground, the fixation lamp assembly is used for guiding a measured person to carry out eyeground imaging, the fixation lamp assembly comprises a central fixation lamp light-emitting unit and an edge fixation lamp light-emitting unit, the ophthalmoscope optical assembly comprises a first lens group, a second lens group, a third lens group, an incident polaroid, a beam splitter, an emergent polaroid, an illuminating light source assembly, a fixation lamp reflecting lens, a fixation lamp collimating lens and a fixation lamp light source assembly, the ophthalmoscope is external, the illuminating light source assembly comprises a near infrared light-emitting unit and a visible light-emitting unit, the eye comprises a cornea, aqueous humor, a pupil, a crystalline lens, a vitreous body and the eyeground, the photosensitive element and the fixation lamp assembly are in conjugate relation with each other and can be integrated together and focused simultaneously, and the fixation lamp is installed on the ophthalmoscope externally, the light source of the fixation lamp assembly is guided into the fundus of a measured person through a fixation lamp collimating lens, a fixation lamp reflecting mirror, a beam splitter and a first lens group, the beam splitter is positioned between the first lens group and a third lens group, the fixation lamp collimating lens is used for collimating the fixation lamp light source, the fixation lamp reflecting lens is used for reflecting the collimated fixation lamp light source to an emergent polaroid and then inputting the light into the beam splitter after becoming linearly polarized light, the emergent polaroid is used for filtering the fixation lamp light source and an illumination light source into the linearly polarized light, the illumination light source of the illumination light source assembly comprises a near infrared light-emitting unit and a visible light-emitting unit and sequentially inputs the light into the emergent polaroid and the beam splitter in a mode of deviating from the light path of the illumination light and the light axis of the fixation lamp light, and the first lens group, the second lens group and the third lens group form an imaging lens group which is used for imaging fundus images to a photosensitive element, the incident polaroid is used for blocking the linearly polarized light reflected back out of the imaging optical path group and allowing the depolarized light diffusely reflected back from the eyeground to pass through the imaging optical path group and finally enter the photosensitive element.

2. A fundus camera having an illumination source coaxial with a fixation light source according to claim 1, wherein: the vision fixation lamp assembly comprises one or more light emitting units, which may be LEDs or LDs, or any light emitting devices.

3. A fundus camera having an illumination source coaxial with a fixation light source according to claim 1, wherein: the illumination source modules may each include one or more LEDs and LDs, or any light emitting devices.

4. A fundus camera having an illumination source coaxial with a fixation light source according to claim 1, wherein: the illumination light source can be directly incident on the emergent polaroid or can be incident on the emergent polaroid after being collimated, and the illumination light source can become a diffuse reflection light source.

5. A fundus camera having an illumination source coaxial with a fixation light source according to claim 1, wherein: the illumination light sources of the illumination light source assembly can be symmetrically and annularly arranged or asymmetrically arranged in an off-axis manner around the optical axis of the illumination light path and the optical axis of the fixed-view lamp light path.

6. A fundus camera having an illumination source coaxial with a fixation light source according to claim 1, wherein: the polarization directions of the emergent polarizer and the incident polarization are mutually vertical.

7. A fundus camera having an illumination source coaxial with a fixation light source according to claim 1, wherein: the fundus camera also comprises an image processing and storing module which is used for processing and storing fundus images or videos acquired by the photosensitive element.

8. A fundus camera having an illumination source coaxial with a fixation light source according to claim 1, wherein: the fundus camera also comprises a display module used for displaying fundus images or videos collected by the photosensitive element.

9. A fundus camera having an illumination source coaxial with a fixation light source according to claim 1, wherein: the fundus camera also includes communication and power interfaces for connecting the components of the fundus camera, including data transfer and power input and output.

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