An illumination device for fundus observation

Abstract

The application provides an illumination device for fundus observation, comprising a contact lens, a light guide plate and an illumination light source; the contact lens is provided with an arc-shaped side and a light-in side, the arc-shaped side is used for adhering to the cornea; the light-in side is provided with the light guide plate; the light guide plate is provided with a light inlet and a light outlet; the incident light of the illumination light source is incident into the light guide plate through the light inlet, the light guide plate reflects the incident light and the reflected light is incident into the contact lens through the light outlet; the incident light passes through the arc-shaped side of the contact lens and the cornea and is incident into the eyeball to illuminate the fundus. The illumination device for fundus observation of the application sets the illumination light source on the side of the contact lens and limits and adjusts the angle of the light incident into the eyeball through the light guide plate, so that the number of the light incident into the fundus is increased, and the contact fundus imaging device can form clear and accurate fundus imaging while reducing the traditional light spot interference.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, specifically relating to an illumination device for fundus observation. Background Technology

[0002] With the advancement of medicine, there is a need to observe the fundus and retina for early detection of lesions and ophthalmic diseases. However, the fundus itself does not emit light and cannot be directly observed; an external light source is required to illuminate it, and imaging is achieved by utilizing the reflected light from the fundus tissue. Fundus observation requires a strict field of view for imaging. When performing large-field-of-view fundus imaging, the angle of incidence of light reflected from the pupil at the edge of the fundus exceeds a critical angle, resulting in total internal reflection, and thus preventing it from entering the imaging system. Therefore, it is necessary to use corneal contact lens components to achieve large-field-of-view fundus imaging.

[0003] In existing contact retinal imaging devices, the external illumination source typically illuminates the fundus from the outside of the contact lens, utilizing the reflected light for imaging. However, when the illumination light enters, it leaves reflected bright spots on the glass surface of the contact lens—the surface where the lens contacts the air. Each time the light passes through a glass surface, a bright spot is produced. Since contact lenses are mostly multi-lens structures, multiple bright spots are generated. Furthermore, due to the incident angle of the illumination source, these bright spots cannot overlap, leaving numerous bright spots in the observation system and significantly interfering with the observer's ability to observe the fundus.

[0004] On the other hand, some contact retinal imaging devices are designed to provide illumination radially from the contact lens, utilizing the principle of total internal reflection to direct the light towards the retina. Once the light reaches the retina, diffuse reflection from the eye muscles returns the light to the observation system, achieving the effect of retinal observation. However, this approach suffers from the problem that the light directed towards the retina is scattered due to its incident direction, resulting in a very limited amount of incident light. Since the observation system requires a certain amount of light, this leads to the inability to form a clear and accurate retinal image. Summary of the Invention

[0005] This invention proposes an illumination device for fundus observation, which aims to increase the amount of light entering the fundus, so that contact fundus imaging devices can form clear and accurate fundus images while reducing interference from traditional light spots.

[0006] According to a first aspect of the embodiments of this application, an illumination device for fundus observation is provided, including a corneal contact lens, a light guide plate, and an illumination source;

[0007] The corneal contact lens has a curved side and a light-incident side. The curved side is used to fit the cornea; a light guide plate is set on the light-incident side.

[0008] The light guide plate is provided with a light inlet and a light outlet; the incident light from the illumination source enters the light guide plate through the light inlet, the light guide plate reflects the incident light and then enters the corneal contact lens through the light outlet; the incident light passes through the curved side of the corneal contact lens and the cornea and enters the eyeball to illuminate the fundus.

[0009] In some embodiments of this application, a light guide protrusion is provided on the light-incident side of the corneal contact lens, and a light guide plate is arranged around the outer side of the light guide protrusion.

[0010] In some embodiments of this application, the outer side of the light guide boss is attached to the light outlet of the light guide plate.

[0011] In some embodiments of this application, the light guide protrusion is a cone; the diameter of the light guide protrusion gradually increases along the direction closer to the eyeball.

[0012] In some embodiments of this application, the light guide plate is attached to the outer side of the light guide boss through a hollow hole in the middle.

[0013] In some embodiments of this application, the light inlet of the light guide plate is located on the side of the light guide plate away from the eyeball, and the light inlet is uniformly arranged around the outside of the light guide protrusion of the corneal contact lens.

[0014] In some embodiments of this application, a reflective film is provided on the outer surface of the light guide plate, and the reflective film is used to reflect the light inside the light guide plate.

[0015] In some embodiments of this application, an illumination source is provided at the light inlet of each light guide plate.

[0016] In some embodiments of this application, the lighting source is an LED light source, a light source introduced by a light guide column, or a light source introduced by an optical fiber.

[0017] In some embodiments of this application, a fundus imaging device is also included;

[0018] Fundus imaging devices receive reflected light from the fundus of the eye to form fundus images.

[0019] The illumination device for fundus observation according to this application includes a corneal contact lens, a light guide plate, and an illumination source. The corneal contact lens has a curved side and a light-incident side, with the curved side conforming to the cornea. A light guide plate is disposed on the light-incident side, and the light guide plate has a light inlet and a light outlet. Incident light from the illumination source enters the light guide plate through the light inlet, and the light guide plate reflects the incident light before it enters the corneal contact lens through the light outlet. The incident light passes through the curved side of the corneal contact lens and the cornea, illuminating the fundus. This illumination device for fundus observation, by placing the illumination source on the peripheral side of the corneal contact lens and limiting and adjusting the angle of entry into the eyeball using the light guide plate, increases the amount of light entering the fundus, enabling the contact fundus imaging device to form clear and accurate fundus images while reducing interference from traditional light spots. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 The diagram shows a schematic representation of the structure of an illumination device for fundus observation in the prior art;

[0022] Figure 2 The diagram shows a schematic of the structure of another illumination device for fundus observation in the prior art;

[0023] Figure 3 The diagram shows a schematic structural diagram of an illumination device for fundus observation according to an embodiment of this application;

[0024] Figure 4 The diagram shows a three-dimensional structural schematic of an illumination device for fundus observation according to an embodiment of this application;

[0025] Figure 5 The diagram shows a schematic structural diagram of the light guide plate of the illumination device for fundus observation according to an embodiment of this application;

[0026] Figure 6 The text shows the data based on... Figure 5 A-axis cross-sectional view of the light guide plate;

[0027] Figure 7 The diagram shows a schematic structural diagram of the light guide plate of the illumination device for fundus observation according to an embodiment of this application;

[0028] Figure 8 The diagram shows a schematic structural diagram of an illumination device for fundus observation according to another embodiment of this application;

[0029] Figure 9The diagram shows a schematic optical path of an illumination device for fundus observation according to an embodiment of this application;

[0030] Figure 10 The image shown is an imaging effect diagram of an illumination device for fundus observation according to an embodiment of this application. Detailed Implementation

[0031] In the process of developing this application, the inventors discovered that in existing illumination devices for fundus observation, the external illumination source generally illuminates from the outside of the contact lens toward the fundus, utilizing the reflected light for imaging observation. For example... Figure 1 As shown, illumination light passes through the contact lens from the observation system side, enters the eyeball, illuminates the fundus, and then returns from the fundus. The returning light exits from the observation system side and is received, ultimately forming an image of the fundus. However, during this process, the illumination light leaves reflected bright spots on the surface of the contact lens glass, i.e., the surface of the lens in contact with the air. These bright spots are then left in the observation system, greatly interfering with the observer's ability to observe the fundus.

[0032] To solve the problem of multiple bright spots appearing during the return, such as Figure 2 As shown, some contact fundus imaging devices are designed to provide illumination radially from the fundus contact lens, utilizing the principle of total internal reflection to direct the light source towards the fundus. Once the light reaches the fundus, diffuse reflection from the eye muscles returns the light to the observation system, achieving the effect of fundus observation. However, the observation system requires a certain amount of light. Because the light directed towards the fundus is scattered due to its incident direction, the incident light is extremely limited, resulting in the inability to form a clear and accurate fundus image. Ultimately, the imaging effect of existing contact fundus imaging devices is scattered and dark, failing to form a clear and bright image.

[0033] Specifically, the inventors discovered that the light source positioned radially on the contact lens has a random direction, resulting in incident light at arbitrary angles, which disperses the energy of the light source. Furthermore, the total internal reflection angle of the material has certain requirements; it's impossible to guide light at all angles into the total internal reflection material. Since all materials absorb light, light will still be absorbed by the material after multiple reflections. In summary, because the direction of light introduced into the total internal reflection material is chaotic and lacks directionality, some light escapes from the material, ultimately resulting in extremely limited light incident on the fundus.

[0034] When some light enters the eye tissue, the tissue does not possess total internal reflection. Total internal reflection is a phenomenon that occurs when light passes through an optically denser medium and travels to an optically sparser medium. However, there is no significant difference in optical density and sparseness within the eye tissue; therefore, total internal reflection does not exist. Diffuse reflection is used to further reflect the already weak light. Diffusely reflected light is also non-directional, and various tissues in the eye absorb light to some extent. Therefore, the amount of light that actually reaches the fundus is extremely weak.

[0035] NA (Numerical Aperture) is the numerical aperture of an optical fiber, which refers to the maximum incident angle that can guarantee total internal reflection. Since the observation system has a requirement for the NA value of the light emitted by the observed system, the light received by the observation system is the integral of the energy and angle of the light emitted by the observed system. Therefore, the light diffusely reflected from the fundus to the observation system is originally very weak, and the light that meets the angle requirement is even rarer. In the end, it is impossible to form a clear and accurate fundus image, and the purpose of observing the fundus cannot be achieved.

[0036] Based on this, the illumination device for fundus observation of this application includes a corneal contact lens, a light guide plate, and an illumination source; the corneal contact lens is provided with a curved side and a light-incident side, the curved side being used to conform to the cornea; a light guide plate is provided at the light-incident side; the light guide plate is provided with a light inlet and a light outlet; the incident light from the illumination source enters the light guide plate through the light inlet, the light guide plate reflects the incident light and then enters the corneal contact lens through the light outlet; the incident light passes through the curved side of the corneal contact lens and the cornea and enters the eyeball to illuminate the fundus.

[0037] The illumination device for fundus observation disclosed in this application increases the amount of light entering the fundus by placing the illumination source on the peripheral side of the corneal contact lens and limiting and adjusting the angle of light entering the eyeball through a light guide plate. This allows the contact fundus imaging device to form a clear and accurate fundus image while reducing interference from traditional light spots. With the illumination device for fundus observation disclosed in this application, there is no need to narrow the viewing angle to avoid light spots, greatly increasing the observation range of the fundus.

[0038] Furthermore, in order to solve the problem of weak light return in the prior art, this application uses multiple LEDs as light sources and uses a coated light guide plate to reflect the light to the fundus at a special angle.

[0039] The light guide plate of this application is a transparent light guide plate, and the outer surface of the light guide plate is coated with a reflective film, except for the light inlet and outlet. The reflective film on the outer surface of the light guide plate has the function of repeatedly reflecting the light entering the light guide plate until the reflected direction of the light tends towards the fundus before it can be emitted from the light outlet of the light guide plate.

[0040] Meanwhile, this application includes a transparent contact lens with one side concave, a shape that facilitates a good fit between the contact lens and the cornea of ​​the eye. The other side of the contact lens fits well with the corresponding surface of the light guide plate, allowing light to pass through.

[0041] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0042] Example 1

[0043] Figure 3 The diagram shows a schematic structural diagram of an illumination device for fundus observation according to an embodiment of this application. Figure 4 The diagram shows a three-dimensional structural schematic of an illumination device for fundus observation according to an embodiment of this application.

[0044] like Figure 3 and Figure 4 As shown, the illumination device for fundus observation in this embodiment includes a corneal contact lens 10, a light guide plate 21, and an illumination source 20.

[0045] Specifically, such as Figure 3 As shown, the corneal contact lens 10 has an arc-shaped side 11 and a light-incident side 12. The arc-shaped side 11 is used to fit the cornea of ​​the eyeball A; a light guide plate 21 is provided at the light-incident side 12.

[0046] Figure 5 The diagram shows a schematic structural diagram of the light guide plate 21 of the illumination device for fundus observation according to an embodiment of this application. Figure 6 The text shows the data based on... Figure 5 Cross-sectional view of the light guide plate 21 along the AA direction.

[0047] like Figure 5 and Figure 6 As shown, the light guide plate 21 is provided with a light inlet 201 and a light outlet 202; the incident light from the illumination source enters the light guide plate 21 through the light inlet 201, and the light guide plate 21 reflects the incident light and then enters the corneal contact lens 10 through the light outlet 202.

[0048] Finally, the incident light passes through the curved side 11 of the corneal contact lens 10 and the cornea, entering the eyeball A to illuminate the fundus. The reflected light from the fundus eventually passes through the corneal contact lens 10 and exits.

[0049] In specific implementation, such as Figure 3 and Figure 4As shown, a light guide protrusion 101 is provided on the light-incident side 12 of the corneal contact lens 10, and a light guide plate 21 is arranged around the outer side of the light guide protrusion 101.

[0050] Specifically, the light guide protrusion 101 is attached to the light outlet 202 of the light guide plate 21. The incident light from the illumination source enters the light guide plate 21, and after multiple reflections inside the light guide plate 21, the light enters the light guide protrusion 101 through the light outlet 202 attached to the light guide plate 21, and then enters the corneal contact lens 10.

[0051] Detailed description, such as Figure 3 As shown, the light guide protrusion 101 is a cone, and its axial cross-section is trapezoidal. The diameter of the light guide protrusion 101 gradually increases along the direction closer to the eyeball A. Correspondingly, as can be seen from the cross-section of the entire corneal contact lens 10, the light guide protrusion 101 is a cone that decreases in size along the protrusion opening. The tilt angle of its conical side can be adjusted according to the different sizes of corneal contact lenses and the different thicknesses of the light guide plate 21 in actual imaging. This allows for the filtering and selection of light from the light guide plate 21 at the optimal angle to enter the corneal contact lens 10, achieving the highest light utilization rate and the best imaging effect.

[0052] Figure 7 The diagram shows a schematic structural diagram of the light guide plate of an illumination device for fundus observation according to an embodiment of this application.

[0053] When implementing the preferred method, such as Figure 7 As shown, examples of the angle range of different positions of the light guide plate are specifically illustrated, where the angle of ∠a is between 90° and 100°; the angle of ∠b is between 160° and 180°; and the angle of ∠c is between 25° and 35°. Setting the light guide plate within this angle range can filter and select the light at the optimal angle in the light guide plate 21 to enter the corneal contact lens 10, thereby achieving the highest light utilization rate and the best imaging effect.

[0054] Meanwhile, the light guide plate 21 is attached to the outer side of the light guide protrusion 101 through the hollow hole in the middle. That is, the light guide plate 21 has a light outlet 202 along the side of the hollow hole in the middle, so that the outer side of the light guide protrusion 101 is attached to the light outlet 202 of the light guide plate 21. This achieves the effect that light passes through the light guide plate 21 and directly enters the light guide protrusion 101, and then passes through the corneal contact lens 10 and enters the eyeball A.

[0055] Correspondingly, since the light guide plate 21 has a light outlet 202 along the side of the central hollow hole and is attached to the outside of the light guide boss 101, that is, attached to the outside of the conical boss of the light guide boss 101, as described above, the light guide boss 101 has a certain tilt angle. Therefore, the side of the central hollow hole of the light guide plate 21, i.e., the light outlet 202, also has a corresponding tilt angle. In this application, the tilt angle is adjusted according to different corneal contact lens sizes and different thicknesses of the light guide plate 21. This achieves that after multiple reflections within the light guide plate 21, the incident light at a specific incident angle is filtered and selected by the light outlet 202 with a set tilt angle and enters the corneal contact lens 10, thereby allowing the light at the optimal angle in the light guide plate 21 to enter the corneal contact lens 10, achieving the highest light utilization rate and the best imaging effect.

[0056] The light guide plate 21 reflects the incident light and then directs it through the light outlet 202 into the corneal contact lens 10. Finally, the incident light passes through the curved side 11 of the corneal contact lens 10 and the cornea, illuminating the fundus of the eyeball A. The reflected light from the fundus eventually passes through the curved side 11 of the corneal contact lens 10 and through the hollow hole of the conical light guide protrusion 101 before exiting.

[0057] Furthermore, the light inlet 201 of the light guide plate 21 is located on the side of the light guide plate 21 away from the eyeball A, and the light inlet 201 is uniformly arranged around the outside of the light guide protrusion 101 of the corneal contact lens 10.

[0058] In specific implementation, such as Figure 6 As shown, a reflective film L is provided on the outer surface of the light guide plate 21. That is, a reflective film L is provided on the peripheral side of the light guide plate 21 in the area outside the light inlet 201 and the light outlet 202. The reflective film L is used to reflect the light inside the light guide plate 21, thereby reducing the light loss entering the light guide plate 21. This allows the light from the light guide plate 21 to be reflected multiple times until it is emitted through the light outlet 202 at a certain angle, further improving the light utilization rate, forming a clearer imaging image, and improving the quality of fundus imaging.

[0059] This application places the illumination source on the peripheral side of the corneal contact lens. As shown in the above light incident path, the final illumination light enters the eyeball and then illuminates the entire fundus through diffuse reflection. This avoids the illumination light passing through the second side of the lens in contact with air, thus preventing bright spots left by reflections on the lens-air contact surface and solving the problem of light spot interference in fundus imaging.

[0060] Meanwhile, this application increases the amount of light entering the fundus by limiting and adjusting the angle of light entering the eyeball through a light guide plate, so that the contact fundus imaging device can form a clear and accurate fundus image while reducing interference from traditional light spots.

[0061] In the embodiments of this application, such as Figure 3 As shown, the curved side 11 of the corneal contact lens 10 is concave, and the curvature of the concave surface is the same as the anterior curvature of the eyeball, which allows the curved side 11 to better fit the cornea of ​​the eyeball A. In addition, the light-incident side 12 of the corneal contact lens 10 includes a light-guiding protrusion 101, which can closely fit the light outlet 202 of the light guide plate 21 when illumination light is incident, so as to maximize the total internal reflection of the illumination light and increase the utilization rate of the illumination light.

[0062] Preferred implementation, such as Figure 4 As shown, each light guide plate 21 has an illumination source 20 at its light inlet 201. The illumination source is an LED light source, a light source introduced by a light guide column or an optical fiber light source, or other forms of light-emitting body.

[0063] When multiple lighting sources 20 are provided, the light holes are evenly distributed on the peripheral side of the light guide plate 21.

[0064] The light inlet 201 can be a light aperture, and the illumination source 20 is positioned relative to the light aperture so that the illumination light from the light source enters the corneal contact lens 10 through the light inlet 14.

[0065] In other embodiments, the light from the illumination source 20 can be guided into the light guide plate 21 via an optical fiber. Specifically, a glass cover can be provided on the outside of the light guide plate 21, through which the optical fiber can enter the light guide plate 21.

[0066] A corresponding LED light source is provided at the light inlet of the light guide plate 21. The light emitted by the LED light source is reflected by the reflective film L inside the light guide plate 21. Ultimately, most of the light can only be directed towards the fundus through the light channel between the light guide plate 21 and the corneal contact lens 10.

[0067] Figure 8 The diagram shows a schematic structural diagram of an illumination device for fundus observation according to another embodiment of this application.

[0068] like Figure 8 As shown, the illumination device for fundus observation in this embodiment of the application also includes a fundus imaging device 30, which is used to receive reflected light from the fundus to form a fundus image.

[0069] A fundus imaging device 30 is provided on the outer side of the light-receiving side 12 of the corneal contact lens 10. The eyeball A, the corneal contact lens 10, the light guide plate 21 and the fundus imaging device 30 are arranged sequentially on the same axis.

[0070] Furthermore, the light guide plate 21 can be manufactured as the same component as the corneal contact lens 10.

[0071] Alternatively, the corneal contact lens 10, the light guide plate 21, and the illumination source can be connected by a fixed frame to form a corneal contact assembly, which further improves the penetration effect of reflected light from the fundus and the efficiency of the fundus imaging device in receiving reflected light from the fundus, thereby improving the quality of fundus imaging. At the same time, the formed corneal contact assembly is easy to install and carry.

[0072] Figure 9 The diagram shows a schematic optical path of an illumination device for fundus observation according to an embodiment of this application; Figure 10 The image shown is an imaging effect diagram of an illumination device for fundus observation according to an embodiment of this application.

[0073] Depend on Figure 8 and Figure 9 As can be seen, the illumination device for fundus observation in this application increases the amount of light entering the fundus by setting the illumination source on the side of the corneal contact lens 10 and limiting the angle of light entering the eyeball A by the light guide plate 21, so that the contact fundus imaging device can form a clear and accurate fundus image while reducing the interference of traditional light spots.

[0074] The illumination device for fundus observation according to this application includes a corneal contact lens 10, a light guide plate 21, and an illumination source. The corneal contact lens 10 has an arc-shaped side 11 and a light-incident side 12. The arc-shaped side 11 is used to conform to the cornea. The light guide plate 21 is provided at the light-incident side 12. The light guide plate 21 has a light inlet 201 and a light outlet 202. The incident light from the illumination source enters the light guide plate 21 through the light inlet 201. The light guide plate 21 reflects the incident light and then enters the corneal contact lens 10 through the light outlet 202. The incident light passes through the arc-shaped side 11 of the corneal contact lens 10 and the cornea, and enters the eyeball A to illuminate the fundus. The illumination device for fundus observation of this application increases the amount of light entering the fundus by placing the illumination source on the periphery of the corneal contact lens 10 and limiting the angle of light entering the eyeball A by the light guide plate 21. This allows the contact fundus imaging device to form a clear and accurate fundus image while reducing interference from traditional light spots.

[0075] To address the problem of weak light return in existing technologies, this application proposes using multiple LEDs as light sources and a coated light guide plate to reflect the light to the fundus at a specific angle.

[0076] The light guide plate of this application is a transparent light guide plate, and the outer surface of the light guide plate is coated with a reflective film, except for the light inlet and outlet. The reflective film on the outer surface of the light guide plate has the function of repeatedly reflecting the light entering the light guide plate until the reflected direction of the light tends towards the fundus before it can be emitted from the light outlet of the light guide plate.

[0077] Meanwhile, this application includes a transparent contact lens with one side concave, a shape that facilitates a good fit between the contact lens and the cornea of ​​the eye. The other side of the contact lens fits well with the corresponding surface of the light guide plate, allowing light to pass through.

[0078] Compared to existing technologies, the illumination light in this application is reflected by a reflective film and then directed towards the fundus at a specific angle, rather than being reflected to the fundus through total internal reflection of the material and diffuse reflection by the eye tissue. The light illuminating the fundus in this application enters the eyeball and directly reaches the fundus, significantly increasing the light power for illuminating the fundus.

[0079] Meanwhile, this application uses a point light source, which facilitates control over the direction of light illumination. By directly illuminating the fundus, less light escapes from the optical devices and is absorbed by the eye tissues, further improving the efficiency of light utilization.

[0080] The illumination device for fundus observation in this application further solves the problem of light spot interference in fundus imaging by placing the illumination source on the peripheral side of the corneal contact lens. This is achieved by reflecting the light onto the fundus, thus avoiding bright spots left by the reflected light when it passes through the lens surface in contact with air. Furthermore, this illumination device eliminates the need to narrow the viewing angle to avoid light spots, significantly increasing the observation range of the fundus. It also eliminates the need for repeated adjustments to the illumination path parameters, improving examination efficiency and expanding the application range and operational efficiency of the device.

[0081] It should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale.

[0082] The above description of at least one exemplary embodiment is merely illustrative and is not intended to limit the scope of this application or its application or use.

[0083] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0084] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0085] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0086] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0087] It should be understood that although the terms first, second, third, etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of this invention, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0088] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0089] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. An illumination device for fundus observation, characterized in that, This includes contact lenses, light guide plates, and illumination sources; The corneal contact lens has an arc-shaped side and a light-incident side, the arc-shaped side being used to conform to the cornea; a light guide plate is disposed on the light-incident side; a reflective film is disposed on the outer surface of the light guide plate, the reflective film being used to reflect the light inside the light guide plate; an illumination source is disposed at the light inlet of each light guide plate; The light guide plate is provided with a light inlet and a light outlet; there is no coating on the light inlet and the light outlet; the incident light from the illumination source enters the light guide plate through the light inlet, the light guide plate reflects the incident light and then enters the corneal contact lens through the light outlet; the incident light passes through the curved side of the corneal contact lens and the cornea and enters the eyeball to illuminate the fundus.

2. The illumination device for fundus observation according to claim 1, characterized in that, The light-incident side of the corneal contact lens includes a light-guiding protrusion, and the light-guiding plate is arranged around the outer side of the light-guiding protrusion.

3. The illumination device for fundus observation according to claim 2, characterized in that, The outer side of the light guide boss is attached to the light outlet of the light guide plate.

4. The illumination device for fundus observation according to claim 2, characterized in that, The light guide protrusion is a cone; the diameter of the light guide protrusion gradually increases along the direction closer to the eyeball.

5. The illumination device for fundus observation according to claim 2, characterized in that, The light guide plate is attached to the outside of the light guide boss through a hollow hole in the middle.

6. The illumination device for fundus observation according to claim 2, characterized in that, The light inlet of the light guide plate is located on the side of the light guide plate away from the eyeball, and the light inlet is uniformly arranged around the outside of the light guide protrusion of the corneal contact lens.

7. The illumination device for fundus observation according to claim 1, characterized in that, The lighting source is an LED light source, a light source introduced by a light guide column, or a light source introduced by an optical fiber.

8. The illumination device for fundus observation according to claim 1, characterized in that, It also includes fundus imaging devices; The fundus imaging device receives reflected light from the fundus to form a fundus image.

Images