Praxico plate assembly

Abstract

The invention relates to a Praxiso plate assembly which comprises a Praxiso plate conical plate, a Praxiso plate front shell and a Praxiso plate rear shell, the Praxiso plate front shell and the Praxiso plate rear shell are assembled to form a cavity, and the Praxiso plate conical plate is arranged in the cavity in a sleeved mode; a hollow round hole is formed in the bottom of the front shell of the Praxiso disc, and a light guide area is arranged at the bottom of the rear shell of the Praxiso disc, so that a light source enters from the light guide area, penetrates through the conical disc of the Praxiso disc, exits from the hollow round hole of the front shell of the Praxiso disc and is projected to human eyes located at the front end of the Praxiso disc assembly, and a corneal topographic map is formed. Therefore, the pramidodisc assembly is simple in structure, the corneal topography map can be formed by utilizing the external light source, the corneal state of the human eyes can be detected, the pramidodisc assembly can be conveniently combined with other ophthalmic examination equipment for use, the product is more comfortable and has more affinity, and the use viscosity of a user is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of intelligent devices, and particularly relates to a Placido disc assembly. BACKGROUND

[0002] Traditional ophthalmic devices include a fundus camera and a corneal topography dry eye instrument, wherein the fundus camera can shoot a fundus retinal image and a retinal blood vessel image of a user in order to diagnose the fundus health status of the user; the corneal topography dry eye instrument usually projects concentric rings onto the cornea of the user based on the Placido disc principle, and then the corneal state of the user can be evaluated by observing the virtual image of the concentric rings reflected on the cornea.

[0003] However, in real use scenarios, the fundus camera and the corneal topography dry eye instrument are usually independent ophthalmic devices, so the user needs to perform relevant ophthalmic examinations multiple times and with clear targets in order to obtain corresponding detection results, which leads to inconvenient daily ophthalmic examinations and further affects the use stickiness of the user. SUMMARY

[0004] The present disclosure provides a Placido disc assembly to at least solve the problem in the prior art that the user needs to perform relevant ophthalmic examinations multiple times and with clear targets in order to obtain corresponding detection results, which leads to inconvenient daily ophthalmic examinations and further affects the use stickiness of the user. The technical solution of the present disclosure is as follows:

[0005] According to an embodiment of the present disclosure, a Placido disc assembly is provided, comprising a Placido disc cone-shaped disc, a Placido disc front shell and a Placido disc rear shell, wherein:

[0006] The Placido disc front shell and the Placido disc rear shell are assembled to form a cavity, and the Placido disc cone-shaped disc is sleeved inside the cavity;

[0007] The Placido disc front shell has a hollow circular hole at the bottom, and the Placido disc rear shell has a light guide area at the bottom, so that the light source is emitted from the light guide area, passes through the Placido disc cone-shaped disc, and is emitted from the hollow circular hole of the Placido disc front shell to form a corneal topography on the human eye located at the front end of the Placido disc assembly.

[0008] Optionally, the Placido disc cone-shaped disc comprises a first cone-shaped disc and a second cone-shaped disc, wherein:

[0009] The opening side of the first cone-shaped disc is aligned with the hollow circular hole of the Placido disc front shell;

[0010] The narrow side of the first cone-shaped disc is assembled with the narrow side of the second cone-shaped disc;

[0011] The opening side of the second conical disc is in contact with the bottom of the Prados disc rear shell, and the circular coverage area of the opening side of the second conical disc does not coincide with the light guide area.

[0012] Optionally, the light guide area is in a circular ring shape, the inner side of the light guide area is a hollow circular hole, and the hollow circular hole of the Prados disc rear shell is aligned with the inner ring of the light guide area.

[0013] Optionally, the first conical disc adopts a PC light guide plate with uniform light powder added, and the surface is sprayed with a concentric circular ring-shaped black and white coating.

[0014] Optionally, the second conical disc adopts a light shielding material.

[0015] Optionally, the Prados disc front shell adopts a white ABS material and / or a white PC material.

[0016] Optionally, the Prados disc rear shell adopts a transparent PC material, and the inside of the Prados disc rear shell is sprayed with a white coating except for the light guide area.

[0017] Optionally, the Prados disc assembly is detachably mounted at the front end of the lens barrel of the fundus camera, so that the fundus camera provides the light source for the Prados disc assembly.

[0018] Optionally, the Prados disc rear shell is mounted with a magnet, so that the Prados disc assembly is magnetically attracted to the front end of the lens barrel of the fundus camera.

[0019] Optionally, the Prados disc rear shell further comprises a silica gel pad, wherein:

[0020] The silica gel pad is located on one side of the Prados disc rear shell relative to the fundus camera, so that the Prados disc assembly is in soft contact with the fundus camera.

[0021] The technical solutions provided by the embodiments of the present disclosure at least bring the following beneficial effects:

[0022] The Prados disc assembly provided by the embodiments of the present disclosure comprises a Prados disc conical disc, a Prados disc front shell, and a Prados disc rear shell, wherein: the Prados disc front shell and the Prados disc rear shell are assembled to form a cavity, and the Prados disc conical disc is sleeved inside the cavity; the Prados disc front shell has a hollow circular hole at the bottom, and the Prados disc rear shell has a light guide area at the bottom, so that the light source is emitted from the light guide area, passes through the Prados disc conical disc, and is emitted from the hollow circular hole of the Prados disc front shell to project onto the human eye located at the front end of the Prados disc assembly to form a corneal topography.

[0023] Thus, the application provides a Placido disc assembly. A light source is arranged to emit light from a light guide area at the bottom of the rear shell of the Placido disc, pass through the conical disc of the Placido disc, and emit light from the hollow circular hole of the front shell of the Placido disc, so as to project the light to the human eye at the front end of the Placido disc assembly, and form a corneal topography. It can be seen that the Placido disc assembly has a simple structure, and the corneal topography can be formed by using an external light source, so as to realize the detection of the corneal state of the human eye. The Placido disc assembly can be conveniently combined with other ophthalmic examination equipment, so that the product is more comfortable and has more affinity, and the use viscosity of the user is improved.

[0024] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings incorporated in the specification and forming a part of it, illustrate embodiments consistent with the present disclosure, and together with the description, serve to explain the principles of the present disclosure, and do not limit the present disclosure.

[0026] Figure 1 is a schematic diagram of a corneal topography dry eye instrument based on the principle of Placido disc in the related art.

[0027] Figure 2 is a corneal topography generated by a corneal topography dry eye instrument in the related art.

[0028] Figure 3 is a schematic diagram of a Placido disc assembly according to an exemplary embodiment.

[0029] Figure 4 is a sectional view of a Placido disc assembly according to an exemplary embodiment.

[0030] Figure 5 is an assembly diagram of a Placido disc assembly and a fundus camera according to an exemplary embodiment.

[0031] Figure 6 is a schematic diagram of the inner side of a Placido disc rear shell according to an exemplary embodiment.

[0032] Figure 7 is a schematic diagram of the outer side of a Placido disc rear shell according to an exemplary embodiment.

[0033] Figure 8 is an exploded view of a Placido disc assembly according to an exemplary embodiment.

[0034] Figure 9 is a light path schematic diagram of a fundus camera according to an exemplary embodiment.

[0035] Figure 10 This is a schematic diagram of the optical path of a Plassey multi-disk assembly according to an exemplary embodiment.

[0036] Figure 11 This is a schematic diagram of the overall structure of a portable fundus camera according to an exemplary embodiment. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solutions of this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0038] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0039] like Figure 1 The image shown is a schematic diagram of a corneal topography dry eye device based on the Placid disc principle, as described in the related technology. Figure 2 As shown, Figure 1 The corneal topography map shown is generated by a dry eye device.

[0040] Specifically, based on the traditional topographic mapping principles of the Plassid disk... Figure 1 The corneal topography dry eye device shown employs a projection design of 21 concentric black and white rings. When the user brings the placido disc close to the eyeball, the light source passes through these concentric rings, projecting a virtual image of the concentric rings onto the cornea, thus obtaining a corneal topography dry eye device. Figure 2 The corneal topography map shown is an example of how observation of this map can provide a general qualitative assessment of a user's corneal morphology. For instance, by measuring the height differences of different rings on the corneal surface, the smoothness and degree of variation of the corneal surface can be evaluated, thereby determining the moisture level of the corneal surface, and so on.

[0041] However, in real-world applications, corneal topography dry eye devices and fundus cameras are usually separate ophthalmic devices. As a result, users need to undergo multiple, targeted ophthalmic examinations to obtain the corresponding test results, which makes routine ophthalmic examinations inconvenient and affects user engagement.

[0042] Based on this, the present disclosure provides a Prassidus disk assembly to solve the problems in the related art. The Prassidus disk assembly comprises a Prassidus disk cone-shaped disk, a Prassidus disk front shell and a Prassidus disk rear shell, wherein:

[0043] The Prassidus disk front shell and the Prassidus disk rear shell are assembled to form a cavity, and the Prassidus disk cone-shaped disk is sleeved inside the cavity;

[0044] The Prassidus disk front shell has a hollow circular hole at the bottom, and the Prassidus disk rear shell has a light guide area at the bottom, so that the light source is emitted from the light guide area, passes through the Prassidus disk cone-shaped disk, and is emitted from the hollow circular hole of the Prassidus disk front shell to the human eye located at the front end of the Prassidus disk assembly, forming a corneal topography.

[0045] In this application, as Figure 3 shown, it is a schematic diagram of the Prassidus disk assembly, and the Prassidus disk front shell and the Prassidus disk rear shell are sleeved and combined, specifically, it can be a buckle type combination, or Figure 3 as shown, it is installed by screws, and the specific form is not limited.

[0046] The Prassidus disk cone-shaped disk is sleeved inside the cavity formed by the Prassidus disk front shell and the Prassidus disk rear shell. Since the Prassidus disk front shell and the Prassidus disk rear shell both have a hollow circular hole, the light source can be emitted from the light guide area at the bottom of the Prassidus disk rear shell and pass through the Prassidus disk cone-shaped disk during the process of passing through the hollow circular hole. The Prassidus disk cone-shaped disk can process the emitted light source into a black-and-white annular shape, and finally project it to the human eye located at the front end of the Prassidus disk assembly to form a corneal topography.

[0047] That is, the Prassidus disk assembly can use external light sources to detect the corneal state of the human eye. For example, when the Prassidus disk assembly is installed at the front end of the lens barrel of the fundus camera, the fundus camera provides light sources for the Prassidus disk assembly. The light sources pass through the Prassidus disk assembly and project onto the human eye located at the front end of the Prassidus disk assembly, forming a black-and-white annular projection on the human eye, thereby obtaining a corneal topography. The corneal topography obtained by the present application is similar to the corneal topography generated by the Figure 2 corneal topography dry eye instrument.

[0048] In this way, the Prassidus disk assembly can use external light sources to detect the corneal state of the human eye, and does not need to provide light sources during the detection process, thereby reducing the volume of the Prassidus disk assembly and improving its portability.

[0049] In an implementation manner, the Prassidus disk cone-shaped disk comprises a first cone-shaped disk and a second cone-shaped disk, wherein:

[0050] The opening side of the first cone-shaped disk is aligned with the hollow circular hole of the Prassidus disk front shell;

[0051] The narrow side of the first conical disk is assembled with the narrow side of the second conical disk;

[0052] The opening side of the second conical disk contacts the bottom of the rear shell of the Placid disk, and the circular coverage area of ​​the opening side of the second conical disk does not coincide with the light guide area.

[0053] like Figure 4 The figure shows a cross-sectional view of the Plassido disc assembly. The front shell of the Plassido disc is fitted over the outside of the first conical disc of the Plassido disc. The narrow side of the first conical disc is assembled with the narrow side of the second conical disc. The rear shell of the Plassido disc presses against the second conical disc and is assembled with the front shell of the Plassido disc to form a complete Plassido disc assembly.

[0054] In other words, the light source enters from the light-guiding area at the bottom of the Placidos disk's rear shell, passes through the cavity formed by the assembly of the Placidos disk's front shell and rear shell, and then passes through the first conical disk, so that the incoming light source is converted into a black and white ring shape, and then exits from the opening side of the first conical disk, and is finally projected onto the human eye located at the front end of the Placidos disk assembly to form a corneal topography map.

[0055] In one implementation, the light guide region is annular, with a hollow circular hole inside the light guide region, and the hollow circular hole of the Placid disc rear shell is aligned with the inner ring of the light guide region.

[0056] In other words, the light-guiding area at the bottom of the Placidor disc's rear shell is circular, which means... Figure 4 The second conical disk shown has a ring-shaped area outside the contact position between its opening side and the rear shell of the Placido disk. The light-guiding area contains a hollow circular hole within the ring. This allows the first conical disk, the second conical disk, the front shell of the Placido disk, and the rear shell of the Placido disk to form a closed space, thus preventing stray light from entering and affecting the results of corneal condition detection.

[0057] In one implementation, the first conical disk uses a PC light guide plate with added light-diffusing powder, and the surface is coated with a concentric ring-shaped black and white coating.

[0058] Among them, the light-diffusing powder can effectively disperse and scatter the incident light, which is conducive to the uniform propagation and diffusion of light. Therefore, the first cone-shaped disk adopts a PC light guide plate with added light-diffusing powder, which makes the first cone-shaped disk have better light guiding performance. This makes the light projected onto the human eye more uniform and bright, thus obtaining a clearer corneal topography.

[0059] Meanwhile, since light can pass through the white coating but not the black coating which has a high light-blocking capacity, by spraying a concentric ring-shaped black and white coating on the surface of the first conical disk, the emitted light will present a black and white ring shape, which is projected onto the surface of the human eye to form the pattern required for corneal topography.

[0060] PC material, also known as polycarbonate, is a kind of tough thermoplastic resin, which is a kind of macromolecular polymer containing carbonate groups in the molecular chain. According to the structure of the ester group, it can be divided into aliphatic, aromatic, aliphatic-aromatic and other types.

[0061] In one implementation, the second conical disc is made of light shielding material.

[0062] That is, the second conical disc has a light shielding effect and can shield stray light entering the light guide area of the Placido disc rear shell. Specifically, the same material as the first conical disc can be used and a black coating can be sprayed, or a material with high light shielding property can be directly used, which is not limited. In this way, no stray light enters the interior of the Placido disc assembly, so that the light projected onto the human eye is more uniform and bright, and a clearer corneal topography is obtained.

[0063] In one implementation, the Placido disc front shell is made of white ABS material and / or white PC material.

[0064] In this application, the Placido disc front shell is made of white material, which can enhance the light source scattering effect inside the Placido disc assembly, so that the light projected onto the human eye is more uniform and bright, and a clearer corneal topography is obtained.

[0065] ABS material is a terpolymer composed of three monomers: acrylonitrile, butadiene and styrene. The relative content of the three monomers can be changed according to the needs to produce resins with different properties. ABS material has the combined properties of the three components. Acrylonitrile makes it resistant to chemical corrosion and heat, and has a certain surface hardness. Butadiene makes it have high elasticity and toughness. Styrene makes it have the processing and molding characteristics of thermoplastic plastics and improves the electrical properties.

[0066] In one implementation, the Placido disc rear shell is made of transparent PC material, and the other areas inside the Placido disc rear shell except the light guide area are sprayed with white coating.

[0067] That is, the Placido disc rear shell uses transparent PC material, and the outside of the hollow circular hole leaves a certain width of transparent annular area as a light guide area for conducting the annular light source provided by the fundus camera for the Placido disc assembly, and the cavity area is sprayed with white coating inside the cavity.

[0068] In this way, the light source enters the cavity inside the Placido disc assembly through the light guide area, irradiates the surface of the Placido disc conical disc, and then enters the human eye through the Placido disc conical disc. Moreover, the white coating can enhance the light source scattering effect inside the Placido disc assembly, so that the light projected onto the human eye is more uniform and bright, and a clearer corneal topography is obtained.

[0069] In an implementation, as shown in FIG. 1, an assembly diagram of the Placido disc assembly and the fundus camera is shown. In this case, the Placido disc assembly is detachably mounted at the front end of the lens barrel of the fundus camera, so that the fundus camera provides a light source for the Placido disc assembly. Figure 5

[0070] That is, the Placido disc assembly can be mounted at the front end of the lens barrel of the fundus camera, and the fundus camera provides a light source for the Placido disc assembly, and the Placido disc assembly is detachable, and can be mounted or detached according to the current needs of the user, so as to realize different eye health detection functions with the help of the fundus camera.

[0071] Specifically, when the Placido disc assembly is mounted at the front end of the lens barrel of the fundus camera, the fundus camera provides a light source for the Placido disc assembly, and the light source passes through the Placido disc assembly and is projected onto the human eye located at the front end of the Placido disc assembly, forming a black-and-white ring projection on the human eye. Then, the fundus camera can capture the human eye to obtain a corneal topography.

[0072] In this way, the fundus camera realizes the function of the corneal topography dry eye instrument, and the Placido disc assembly can use the light source provided by the fundus camera, without the need for a self-provided light source, thereby reducing the volume of the Placido disc assembly and improving its portability.

[0073] In addition, when the Placido disc assembly is not mounted at the front end of the lens barrel of the fundus camera, the fundus camera can directly capture the human eye located at the front end of the lens barrel to obtain a fundus image. The fundus image can be used for diagnosing the eye condition of the user.

[0074] In an implementation, a magnet is mounted on the Placido disc rear shell to magnetically attract the Placido disc assembly to the front end of the lens barrel of the fundus camera.

[0075] In this case, the magnet can be fixed on the Placido disc rear shell using adhesive, or can be installed in a buckle or nut type, and can be installed inside the cavity formed by the Placido disc rear shell and the Placido disc front shell, or can be installed outside the cavity, and the specific installation position is not limited; correspondingly, a magnet or a metal sheet that can be attracted by the magnet is installed at a position corresponding to the magnet of the Placido disc rear shell at the front end of the lens barrel of the fundus camera. For example, four N45 magnets can be installed in the lens barrel cover of the fundus camera to magnetically attract the Placido disc assembly. In this way, the magnetic attraction force can be provided when the Placido disc assembly is assembled to the fundus camera, so as to achieve the effect of quickly and conveniently assembling and replacing accessories.

[0076] For example, as shown in FIG. 1, the Placido disc assembly is mounted at the front end of the lens barrel of the fundus camera, and the fundus camera provides a light source for the Placido disc assembly. Figure 6 ​The diagram shows the inner side of the rear shell of a Placido disc. At the four corners of the inner side of the rear shell of the Placido disc are the magnet mounting positions. Magnets can be installed at these four positions so that the Placido disc assembly is magnetically attached to the front end of the lens barrel of the fundus camera.

[0077] In one implementation, the Placidor disc rear housing also includes a silicone pad, wherein:

[0078] A silicone pad is located on the side of the posterior shell of the Placidor disc opposite the fundus camera to allow the Placidor disc assembly to make soft contact with the fundus camera.

[0079] In other words, the silicone pad is installed on the outside of the cavity formed by the rear shell and front shell of the Plascido disc to protect the Plascido disc assembly. When the Plascido disc assembly is installed on the fundus camera, the silicone pad can act as a buffer to prevent the Plascido disc assembly from being damaged by bumps or friction with the fundus camera.

[0080] Specifically, the silicone pad can be installed at the corresponding position of the magnet or at any symmetrical position to avoid damage caused by uneven force. This application does not limit this.

[0081] like Figure 7 The diagram shown is a schematic of the outer side of the rear shell of a Placido disc. The four corners of the outer side of the Placido disc's rear shell are the locations for attaching silicone pads. The silicone pads are attached to... Figure 6 The locations shown correspond to the magnet mounting positions, and silicone pads can be installed in these four positions. The innermost circle represents the hollow circular hole at the bottom of the Placidor disc's back cover. The outer ring of the hollow circular hole represents the light-guiding area. The Placidor disc's back cover uses a masking spraying method, keeping the light-guiding area outside the hollow circular hole transparent. For other areas outside the light-guiding area, the external color can be sprayed as needed, while the interior is sprayed white to increase light reflection.

[0082] For example, such as Figure 8 The diagram shown is an exploded view of the Placido disk assembly. The Placido disk front shell and the Placido disk rear shell are assembled with screws. The Placido disk conical disc is fitted inside the cavity formed by the Placido disk front shell and the Placido disk rear shell. There are four magnets and four silicone pads, all of which are attached to the Placido disk rear shell. The magnets are attached inside the cavity, and the silicone pads are attached to the corresponding positions of the magnets on the outside of the cavity.

[0083] In this application, as Figure 9 and Figure 10The diagrams shown are optical path diagrams of the fundus camera and the Plascidus disc assembly. The ring-shaped light source provided by the fundus camera's barrel structure serves as the light source output. When the Plascidus disc assembly is installed at the front end of the fundus camera barrel, the ring-shaped light source serves as the light source input for the Plascidus disc assembly. The light is conducted into the Plascidus disc assembly through the transparent light guide area of ​​the Plascidus disc's rear shell. Since the light can pass through the white coating of the first conical disc but cannot pass through the black coating with high light-blocking properties, it projects onto the surface of the human eye to achieve a black and white halo effect.

[0084] In addition, the structure of the fundus camera may also include a three-dimensional motion platform for adjusting the position of the fundus camera and / or the plascidus disc assembly relative to the human eye.

[0085] like Figure 11 The diagram shows the overall structure of a portable fundus camera. The Plascido disc assembly is detachably mounted at the front end of the lens barrel of the portable fundus camera, and the three-dimensional motion platform is installed inside the entire fundus camera to provide lens barrel displacement and fundus imaging functions.

[0086] Specifically, the Z-axis motor of the three-dimensional motion platform is first controlled to move the fundus camera and plascidoscopy disc assembly in the back-and-forth direction. When a clear ocular surface image appears on the monitor of the fundus camera, it indicates that the Z-axis motor has moved into position. At this time, the X-axis and Y-axis motors are moved to move the fundus camera and plascidoscopy disc assembly in the up-down and / or left-and-right directions. When the center of the pupil in the ocular surface image displayed on the monitor is located at the center of the monitor, the eye positioning is completed.

[0087] As can be seen from the above, the technical solution provided by the embodiments of this disclosure proposes a Placido disk assembly. The light source enters from the light-guiding area at the bottom of the rear shell of the Placido disk, passes through the conical disk of the Placido disk, and exits from the hollow circular hole in the front shell of the Placido disk, projecting onto the human eye located at the front end of the Placido disk assembly to form a corneal topography map. It can be seen that the structure of the Placido disk assembly is relatively simple. By using an external light source, a corneal topography map can be formed to realize the detection of the corneal condition of the human eye. It can be easily combined with other ophthalmic examination equipment, making the product more comfortable and user-friendly, and increasing user stickiness.

[0088] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0089] It should be understood that the present disclosure is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the present disclosure. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A Plassey multi-disc assembly, characterized in that, It includes the Placiddo disk conical disk, the Placiddo disk front shell, and the Placiddo disk rear shell, wherein: The front shell and rear shell of the Placido disk are assembled to form a cavity, and the conical disk of the Placido disk is fitted inside the cavity. The bottom of the front shell of the Placido disk has a hollow circular hole, and the bottom of the rear shell of the Placido disk has a light guiding area, so that the light source enters from the light guiding area, passes through the conical disk of the Placido disk, and exits from the hollow circular hole of the front shell of the Placido disk, and is projected onto the human eye located at the front end of the Placido disk assembly to form a corneal topography map.

2. The Plassey multi-disc assembly according to claim 1, characterized in that, The Plassido conical disk includes a first conical disk and a second conical disk, wherein: The opening side of the first conical disk is aligned with the hollow circular hole of the front shell of the Placido disk; The narrow opening side of the first conical disk is assembled with the narrow opening side of the second conical disk; The opening side of the second conical disk contacts the bottom of the rear shell of the Placido disk, and the circular coverage area of ​​the opening side of the second conical disk does not coincide with the light guide area.

3. The Plassey multi-disc assembly according to claim 2, characterized in that, The light-guiding area is annular, with a hollow circular hole on the inside, and the hollow circular hole of the Placid disc rear shell is aligned with the inner ring of the light-guiding area.

4. The Plassey multi-disc assembly according to claim 2, characterized in that, The first conical disk is made of PC light guide plate with added light homogenizing powder, and the surface is coated with a concentric ring-shaped black and white coating.

5. The Plassey multi-disc assembly according to claim 2, characterized in that, The second conical disk is made of a light-shielding material.

6. The Plassey multi-disc assembly according to claim 1, characterized in that, The front housing of the Placidor disc is made of white ABS material and / or white PC material.

7. The Plassey multi-disc assembly according to claim 1, characterized in that, The Placidor disc rear cover is made of transparent PC material, and the interior of the Placidor disc rear cover, except for the light guide area, is coated with a white coating.

8. The Plassey multi-disc assembly according to claim 1, characterized in that, The plascidoo disc assembly is detachably mounted at the front end of the lens barrel of the fundus camera, so that the fundus camera provides the light source to the plascidoo disc assembly.

9. The Plassey multi-disc assembly according to claim 8, characterized in that, The rear shell of the Placido disc is fitted with a magnet so that the Placido disc assembly is magnetically attached to the front end of the lens barrel of the fundus camera.

10. The Plassey multi-disc assembly according to claim 9, characterized in that, The Placidor disc rear housing also includes a silicone pad, wherein: The silicone pad is located on the side of the Placido disc rear shell opposite the fundus camera, so that the Placido disc assembly makes soft contact with the fundus camera.

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