A multi-focal artificial cornea and its preparation process

Abstract

The present invention discloses a multifocal artificial cornea, which includes a stent and a lens cylinder cooperatively connected to the stent. The stent includes a main body structure, and an opening is provided in the middle of the main body structure. The lens cylinder is penetrated in the opening. The lens cylinder includes a light guiding structure with multiple focal points to form corresponding multiple diopters when the light is zoomed through the light guiding structure. The lens cylinder is made of PMMA material. The present invention also discloses a preparation process of the multifocal artificial cornea. The multifocal artificial cornea of the present invention can not only enable patients to achieve a near vision field but also achieve a distant vision field through the multifocal light guiding structure. When looking at a distance, the light energy allocated to the far focal point is increased, resulting in better distant vision. When looking at a close distance, due to reflection and light stimulation, the light energy allocated to the near focal point is increased, resulting in better near vision, achieving the vision fields at both far and near ends and having a true intermediate vision.

Description

Technical Field

[0001] The present invention relates to a medical device, and more particularly to a multifocal artificial cornea and its preparation process. Background Art

[0002] An artificial cornea is a product made of medical polymer materials that resembles the human cornea. The artificial cornea includes an optical lens column and a stent. The optical lens column is made of a transparent material with excellent optical properties and stable physical and chemical properties, and is used to replace the cloudy cornea that obstructs the optical path of the eyeball after the lesion; the stent is equivalent to a bridge connecting the optical lens column and the surrounding tissues, so it is required to have good tissue compatibility.

[0003] When a person's cornea is damaged and an artificial cornea is installed, in order to avoid complications, the lens needs to be removed. It is suitable for patients with good fundus function and corneal damage who cannot undergo corneal transplantation, such as: patients with corneal diseases or trauma, etc., and patients who have failed multiple corneal transplantations and have lost binocular vision.

[0004] In the currently publicly announced patent with the publication number CN102920532A and the name of an artificial cornea, this artificial cornea has only one diopter and belongs to a single-focus artificial cornea. Since the optical part of this artificial cornea itself has no adjusting power, only one area can be imaged on the retina, so it is impossible to clearly see both distant and near objects at the same time. In order to overcome the drawbacks of the single-focus artificial cornea, it is necessary to improve this technology. Summary of the Invention

[0005] The purpose of the present invention is to provide a multifocal artificial cornea and its preparation process. The multifocal artificial cornea can achieve far and near vision fields, not only can clearly see nearby objects, but also can clearly see distant objects, and has true intermediate vision.

[0006] To achieve the above purpose, the technical solution of the present invention is: a multifocal artificial cornea, including a stent and a lens column cooperatively connected to the stent. The stent includes a main body structure, and an opening is provided in the middle of the main body structure. The lens column is inserted through the opening. The lens column includes a light guiding structure with multiple foci, so as to form corresponding multiple diopters when the light is zoomed through the light guiding structure. The lens column is made of PMMA material.

[0007] As a further improvement, the light guiding structure is a diffractive multifocal structure. One surface of the diffractive multifocal light guiding structure is a smooth spherical surface structure, and the other surface is provided with 20 to 30 concentric circles to form a slope ring structure.

[0008] As a further improvement, the light guiding structure is a refractive multifocal structure. One surface of the refractive multifocal light guiding structure forms 3 to 5 aspherical concentric ring structures, and the other surface is a smooth spherical surface structure.

[0009] As a further improvement, the light guiding structure is a gradient diffraction-refraction type multi-focus structure.

[0010] As a further improvement, the middle part of the light guiding structure of the gradient diffraction-refraction type multi-focus is a diffraction area, and the peripheral part of the light guiding structure is a refraction area.

[0011] As a further improvement, one surface of the light guiding structure of the gradient diffraction-refraction type multi-focus is a refraction surface, and the other surface is a diffraction surface.

[0012] The present invention also discloses a preparation process of a multi-focus artificial cornea, which specifically includes the following steps:

[0013] S1: Preparation of the lens column. Through turning on a lathe, the lens column made of PMMA is formed into a stepped cylindrical structure, and a diffraction type multi-focus light guiding structure is formed on the lens column. One surface of this light guiding structure is a smooth spherical surface structure, and the other surface has a microscopic slope ring structure formed by 20 to 30 concentric circles. An external thread for installation is turned on the installation section.

[0014] S2: Preparation of the main structure in the bracket. The preparation of the PMMA electrospinning plate is achieved through PMMA electrospinning and 3D printing technology to form the main structure in the bracket.

[0015] S3: Stamping the plate to form an opening in the middle of the main structure.

[0016] S4: Turning on a lathe to form an internal thread that meshes with the external thread on the installation section on the inner peripheral wall of the opening in the main structure.

[0017] S5: Assembling the bracket and the lens column, and installing the lens column into the opening of the main structure through the external thread on the installation section of the lens column.

[0018] The present invention also discloses a preparation process of a multi-focus artificial cornea in another embodiment, which specifically includes the following steps:

[0019] S1: Preparation of the lens column. Through turning on a lathe, the lens column made of PMMA is formed into a stepped cylindrical structure, and a refraction type multi-focus light guiding structure is formed on the lens column. One surface of this light guiding structure is composed of 3 to 5 aspherical concentric rings, and the other surface is a smooth spherical surface structure. An external thread for installation is turned on the installation section.

[0020] S2: Preparation of the main structure in the bracket. The main structure made of PMMA is formed through processing on a precision CNC lathe to form the main structure in the bracket.

[0021] S3: Stamping the plate to form an opening in the middle of the main structure.

[0022] S4: Perform turning on the lathe to form an internal thread that meshes with the external thread of the installation section on the inner peripheral wall of the opening of the main structure.

[0023] S5: Assemble the bracket and the lens column. Install the lens column into the opening of the main structure through the external thread on the installation section of the lens column.

[0024] The present invention also discloses a preparation process for a multifocal artificial cornea of the third embodiment, specifically including the following steps:

[0025] S1: Prepare the lens column. Through turning on the lathe, make the lens column made of PMMA form a stepped cylindrical structure, and a gradient diffraction-refraction type multifocal light guiding structure is formed on the lens column. The middle part of the light guiding structure is the diffraction area, and the surrounding part of the light guiding structure is the refraction area. An installation external thread is formed by turning on the installation section.

[0026] S2: Prepare the main structure in the bracket. The main structure made of PMMA is processed by a precision CNC lathe to realize the forming of the main structure in the bracket.

[0027] S3: Perform stamping on the plate to make an opening in the middle of the main structure.

[0028] S4: Perform turning on the lathe to form an internal thread that meshes with the external thread of the installation section on the inner peripheral wall of the opening of the main structure.

[0029] S5: Assemble the bracket and the lens column. Install the lens column into the opening of the main structure through the external thread on the installation section of the lens column.

[0030] The present invention also discloses a preparation process for a multifocal artificial cornea of the fourth embodiment, specifically including the following steps:

[0031] S1: Prepare the lens column. Through turning on the lathe, make the lens column made of PMMA form a stepped cylindrical structure, and a gradient diffraction-refraction type multifocal light guiding structure is formed on the lens column. One side of the light guiding structure is the refraction surface, and the other side of the light guiding structure is the diffraction surface. An installation external thread is formed by turning on the installation section.

[0032] S2: Prepare the main structure in the bracket. The main structure made of PMMA is processed by a precision CNC lathe to realize the forming of the main structure in the bracket.

[0033] S3: Perform stamping on the plate to make an opening in the middle of the main structure.

[0034] S4: Perform turning on the lathe to form an internal thread that meshes with the external thread of the installation section on the inner peripheral wall of the opening of the main structure.

[0035] S5: Assemble the bracket and the lens column. Install the lens column into the opening of the main structure through the external thread on the installation section of the lens column.

[0036] The above technical solution of the present invention has the following beneficial effects: The multi-focal artificial cornea of the present invention forms multiple diopters correspondingly when the light is zoomed through the multi-focal light guiding structure, which can not only enable the patient to achieve a near vision field, but also achieve a vision field of distant objects; when looking at a distance, the light energy allocated to the far focus increases to produce better distant vision. When looking at a near object, due to the reflection and light stimulation, the light energy allocated to the near focus increases, producing better near vision, realizing the vision fields at both the far and near ends and having true intermediate vision. Description of the Drawings

[0037] Figure 1 It is a schematic structural diagram of the multi-focal artificial cornea of the present invention;

[0038] Figure 2 It is a front view of the light guiding structure 201 of the lens column 20 in the first embodiment of the present invention;

[0039] Figure 3 is Figure 2 side view;

[0040] Figure 4 It is a front view of the light guiding structure 201 in the second embodiment of the present invention;

[0041] Figure 5 is Figure 4 side view;

[0042] Figure 6 It is a front view of the light guiding structure 201 in the third embodiment of the present invention;

[0043] Figure 7 It is a partial side view of the light guiding structure 201 in the fourth embodiment of the present invention;

[0044] Figure 8 It is a front view of the bracket 10 of the present invention;

[0045] Figure 9 It is a front view of another structure of the bracket 10 of the present invention. Detailed Embodiments

[0046] The following will describe the embodiments of the present invention in detail with reference to the drawings and embodiments.

[0047] Please refer to Figure 1 As shown, a multi-focal artificial cornea of the present invention includes a bracket 10 and a lens column 20 connected to the bracket 10 for corneal transplantation, which can not only enable the patient to achieve a near vision field, but also achieve a vision field of distant objects.

[0048] Please refer to Figure 8 and Figure 9 As shown, the bracket 10 is used to carry and install the lens column 20. The bracket 10 includes a main structure 101 and a clamping structure 102 formed on the outer periphery of the main structure 101. The main structure 101 is in a spherical structure. An opening 11 is provided in the middle of the main structure 101. The lens column 20 is inserted through the opening 11. Specifically, internal threads are provided on the inner peripheral wall of the opening 11 for fitting and installing the lens column 20. In this embodiment, the outer dimension of the bracket 10 is 7 to 9 mm, and the thickness is 0.05 to 0.5 mm. Preferably, the outer dimension of the bracket 10 is 8 mm, and the thickness is 0.2 mm.

[0049] The lens column 20 is installed in the opening 11 of the main structure 101 to achieve multiple diopters corresponding to the light zoom, which can not only enable the patient to achieve a near vision, but also achieve a vision of distant objects. Specifically, the lens column 20 is a stepped cylindrical structure made of PMMA material. The lens column 20 includes an insertion section 21, a mounting section 22 formed on the insertion section 21, and a light guide section 23 formed on the mounting section 22. The insertion section 21, the mounting section 22, and the light guide section 23 are coaxial, and the radial dimensions increase in sequence. A guiding surface 24 is formed at the connection between the insertion section 21 and the mounting section 22. The outer diameter of the mounting section 22 is equivalent to the inner diameter of the opening 11, and external threads meshing with the internal threads of the opening 11 are provided on the outer peripheral surface of the mounting section 22, so that the lens column 20 is installed in the opening 11 of the main structure 101.

[0050] The bottom end surface of the insertion section 21 forms a smooth spherical structure, and a light guide structure 201 with multiple focal points is formed on the lens column 20. The light guide structure 201 with multiple focal points includes a diffractive multi-focal structure, a refractive multi-focal structure, or a gradient diffractive-refractive multi-focal structure formed when the light zooms.

[0051] Please refer to Figure 2 and Figure 3As shown in the figure, one surface of the multi-focal light guiding structure 201 of the diffractive lens cylinder 20 in the first embodiment of the present invention has a smooth spherical surface structure 1011, and the other surface is provided with a microscopic slope ring-shaped structure 1012 formed by 20 to 30 concentric circles. The height of the slope ring is less than 2 μm, and the ring spacing is 0.06 mm to 0.25 mm. In this embodiment, there are 25 concentric circles of the microscopic slope rings on the surface of the light guiding structure 201. Using the principle of light diffraction, near or far foci are formed. After the incident light passes through the diffractive multi-focal light guiding structure 201, it is divided into two foci. The first is a far focus with a smaller refractive power, and the second is a near focus with a larger refractive power. Its diffraction principle effectively reduces the generation of postoperative halos and glare. The near refractive power is determined by the height of the slope ring itself and the distance between the slope rings. Generally, the near refractive power is +4D higher than the far refractive power. At the same time, only one focus is projected on the retina. When parallel light from afar enters the eye, the far focus falls on the retina to form a clear image, while the image formed by the near focus falls in front of the retina, superimposing a blurred image on the retina. When scattered light from nearby enters the eye, the near focus falls behind the retina, superimposing a blurred image on the retina. For the diffractive multi-focal light guiding structure 201, there are two kinds of light distribution for the far and near foci. One is equal light energy distribution, with both the far focus and the near focus being 41%, and the remaining 18% forming higher-order diffraction. The other is unequal light energy distribution, with the two foci being 70% and 30% respectively (near:far = 7:3 or near:far = 3:7). The greatest advantage of the diffractive multi-focal main structure 101 is that one crystal can produce two foci, and its diffraction structure range is large, and any area participates in the formation of the dual foci. Therefore, the far and near foci are not affected by the pupil size and lens dislocation.

[0052] Please refer to Figure 4 、 Figure 5 As shown in the figure, one surface of the refractive multi-focal light guiding structure 201 in another embodiment of the present invention forms 3 to 5 aspherical concentric ring structures 1013, and the other surface has a smooth spherical surface structure 1011. Different regions of the optical surface have different refractive powers, so that the light forms a relatively wide focus range from far to near after refraction. In this embodiment, there are 4 aspherical concentric rings on the surface of the light guiding structure 201.

[0053] The gradient diffractive-refractive multi-focal light guiding structure 201 is divided into two diffractive-refractive structures: Please refer to Figure 6 As shown in the figure, the middle part of the gradient diffractive-refractive multi-focal light guiding structure 201 in the third embodiment of the present invention is a diffractive region 1017, and the surrounding part of the light guiding structure 201 is a refractive region 1018; Please refer to Figure 7As shown, one surface of the gradient diffractive-refractive multi-focus light guiding structure 201 of the fourth embodiment of the present invention is a refractive surface 1015, and the other surface of the light guiding structure 201 is a diffractive surface 1016. This gradient diffractive-refractive multi-focus light guiding structure 201 can simultaneously utilize the refraction and diffraction of light to form near or far foci.

[0054] Microporous voids are formed on the peripheral surface of the main structure 101. By using the microporous voids on the peripheral surface of the main structure 101, it is convenient for the healing tissue to pass through between the microporous voids, increasing the bonding force and stability between the stent and the cornea and preventing detachment.

[0055] Please refer again to Figure 8 、 Figure 9 As shown, the clamping structure 102 is integrally formed on the main structure 101 and is annularly arrayed on the outer periphery of the main structure 101 with the center of the sphere of the main structure 101 as the center. In this embodiment, the clamping structure 102 can be of various structures such as a clover shape or a double-wing shape.

[0056] The main structure 101 of the stent 10 is made of PMMA material or titanium mesh. The processing of the main structure 101 is achieved through PMMA electrospinning, 3D printing technology, and stamping processing to form the stent. Then, through a physical mixing method, the easily soluble small molecules are dissolved, and then the microporous voids on the stent are realized.

[0057] The preparation process flow of the multi-focus artificial cornea includes the following steps:

[0058] Step 1: Preparation of the lens cylinder 20; specifically, it is processed by a precision CNC lathe so that the lens cylinder 20 forms a stepped cylindrical structure, and a convex multi-focus light guiding structure 201 is formed on the lens cylinder 20, and the bottom end surface of the lens cylinder 20 forms a smooth spherical surface structure. An external installation thread is machined on the installation section 22. Specifically, the light guiding structure 201 is formed into a diffractive multi-focus structure, a refractive multi-focus structure, or a gradient diffractive-refractive multi-focus structure; specifically: one surface of the diffractive multi-focus light guiding structure 201 is a smooth spherical surface, and the other surface has 20 - 30 concentric microscopic slope rings with the nature of concentric circles; one surface of the refractive multi-focus light guiding structure 201 is composed of 3 - 5 aspherical concentric rings, and the other surface is a smooth spherical surface; one surface of the gradient diffractive-refractive multi-focus light guiding structure 201 is a refractive surface, and the other surface of the light guiding structure 201 is a diffractive surface; or the middle part of the gradient diffractive-refractive multi-focus light guiding structure 201 is a diffractive area, and the surrounding part of the light guiding structure 201 is a refractive area.

[0059] Step 2: Preparation of the main structure 101 in the bracket 10; The main structure 101 made of PMMA is processed by a precision CNC lathe to form the main structure 101 in the bracket. Then, through a physical mixing method, the easily soluble small molecules in the main structure 101 are dissolved, and then the micropores on the bracket are realized.

[0060] Step 3: The plate is stamped to form an opening 11 in the middle of the main structure 101.

[0061] Step 4: The inner peripheral wall of the opening 11 of the main structure 101 is machined by turning on a lathe to form an internal thread that meshes with the external thread of the installation section 22.

[0062] Step 5: The bracket 10 and the lens column 20 are assembled. The lens column is installed into the opening 11 of the main structure 101 through the external thread on the installation section 22 of the lens column.

[0063] In summary, the multi-focal artificial cornea of the present invention forms multiple diopters corresponding to the light zoom through the multi-focal light guiding structure, which can not only enable patients to achieve a near vision field, but also achieve a vision field of distant objects; when looking at a distance, the light energy allocated to the far focus is increased to produce better distant vision. When looking at a near object, due to reflection and light stimulation, the light energy allocated to the near focus is increased to produce better near vision, realizing the vision fields at both near and far ends and having true intermediate vision. Secondly, it has good biocompatibility and good optical resolution, the spectral projection characteristics are consistent with those of the natural crystal, there is no spherical aberration, and within all visual ranges, it can provide functional vision, minimize glare to the greatest extent, and has no chromatic aberration.

[0064] The above-described embodiments are only described as the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A multifocal artificial cornea, characterized in that, It includes a bracket (10) and a lens column (20) cooperatively connected to the bracket (10). The bracket includes a main structure (101). An opening (11) is provided in the middle of the main structure (101), and the lens column (20) is provided in the opening (11). The outer peripheral dimension of the bracket (10) is 7 to 9 mm, and the thickness is 0.05 to 0.5 mm; the lens column (20) includes a light guiding structure (201) with multiple focal points, so as to form corresponding multiple diopters when the light is zoomed through the light guiding structure (201). The lens column (20) is a stepped cylindrical structure made of PMMA material. The lens column (20) includes an insertion section (21), a mounting section (22) formed on the insertion section (21), and a light guiding section (23) formed on the mounting section (22). The insertion section (21), the mounting section (22), and the light guiding section (23) are coaxial, and the radial dimensions increase in sequence. A guiding surface (24) is formed at the connection between the insertion section (21) and the mounting section (22). The outer diameter of the mounting section (22) is equivalent to the inner diameter of the opening (11), and an external thread meshing with the internal thread of the opening (11) is provided on the outer peripheral surface of the mounting section (22), so that the lens column (20) is installed in the opening (11) of the main structure (101). The light guiding structure (201) is a diffractive multi-focal structure. One surface of the diffractive multi-focal light guiding structure (201) is a smooth spherical surface structure (1011), and the other surface is provided with 20 to 30 concentric circles to form a slope ring structure (1012). The height of the slope ring is less than 2 μm, and the ring spacing is 0.06 mm to 0.25 mm; The preparation process of the multi-focal artificial cornea includes the following steps: S1: Preparation of the lens column (20). Through turning processing on a lathe, the lens column (20) made of PMMA material is formed into a stepped cylindrical structure, and a diffractive multi-focal light guiding structure is formed on the lens column (20). One surface of the light guiding structure (201) is a smooth spherical surface structure, and the other surface has a microscopic slope ring structure formed by 20 to 30 concentric circles. An external thread for mounting is machined on the mounting section (22); S2: Preparation of the main structure (101) in the bracket (10). The main structure (101) made of PMMA is processed by a precision CNC lathe to realize the forming of the main structure in the bracket; S3: The plate is stamped and formed so that an opening (11) is provided in the middle of the main structure (101); S4: Through turning processing on a lathe, an internal thread meshing with the external thread of the mounting section (22) is machined on the inner peripheral wall of the opening (11) of the main structure (101); S5: The bracket (10) and the lens column (20) are assembled. The lens column is installed into the opening (11) of the main structure (101) through the external thread on the mounting section (22) of the lens column.

2. A multi-focal artificial cornea, characterized in that, It includes a bracket (10) and a lens column (20) cooperatively connected to the bracket (10). The bracket includes a main body structure (101). An opening (11) is provided in the middle of the main body structure (101). The lens column (20) is provided in the opening (11). The outer peripheral dimension of the bracket (10) is 7 to 9 mm, and the thickness is 0.05 to 0.5 mm. The lens column (20) includes a light guiding structure (201) with multiple foci, so as to form corresponding multiple diopters when the light is zoomed through the light guiding structure (201). The lens column (20) is a stepped cylindrical structure made of PMMA material. The lens column (20) includes an insertion section (21), a mounting section (22) formed on the insertion section (21), and a light guiding section (23) formed on the mounting section (22). The insertion section (21), the mounting section (22), and the light guiding section (23) are coaxial, and the radial dimensions increase in sequence. A guiding surface (24) is formed at the connection between the insertion section (21) and the mounting section (22). The outer diameter of the mounting section (22) is equivalent to the inner diameter of the opening (11), and external threads meshing with the internal threads of the opening (11) are provided on the outer peripheral surface of the mounting section (22), so that the lens column (20) is installed in the opening (11) of the main body structure (101). The light guiding structure (201) is a refractive multi-focus structure. One surface of the refractive multi-focus light guiding structure (201) forms 3 to 5 aspherical concentric ring structures (1013), and the other surface is a smooth spherical surface structure (1011). The preparation process of the multi-focus artificial cornea includes the following steps: S1: Preparation of the lens column (20). Through turning processing on a lathe, the lens column (20) made of PMMA material is formed into a stepped cylindrical structure, and a refractive multi-focus light guiding structure is formed on the lens column (20). One surface of the light guiding structure (201) is composed of 3 to 5 aspherical concentric rings, and the other surface is a smooth spherical surface structure. External threads for mounting are turned on the mounting section (22). S2: Preparation of the main body structure (101) in the bracket (10). The main body structure (101) made of PMMA is processed by a precision CNC lathe to realize the forming of the main body structure in the bracket. S3: The sheet material is stamped and formed so that an opening (11) is provided in the middle of the main body structure (101). S4: Turning processing on a lathe is performed to form internal threads meshing with the external threads of the mounting section (22) on the inner peripheral wall of the opening (11) of the main body structure (101). S5: The bracket (10) and the lens column (20) are assembled. The lens column is installed into the opening (11) of the main body structure (101) through the external threads on the mounting section (22) of the lens column.

3. A multifocal artificial cornea, characterized in that, It includes a bracket (10) and a lens column (20) cooperatively connected with the bracket (10). The bracket includes a main structure (101). An opening (11) is provided in the middle of the main structure (101). The lens column (20) is arranged in the opening (11). The outer peripheral dimension of the bracket (10) is 7 to 9 mm, and the thickness is 0.05 to 0.5 mm. The lens column (20) includes a light guiding structure (201) with multiple foci to form corresponding multiple diopters when the light is zoomed through the light guiding structure (201). The lens column (20) is a stepped cylindrical structure made of PMMA material. The lens column (20) includes an insertion section (21), a mounting section (22) formed on the insertion section (21), and a light guiding section (23) formed on the mounting section (22). The insertion section (21), the mounting section (22), and the light guiding section (23) are coaxial, and the radial dimensions increase in sequence. A guiding surface (24) is formed at the connection between the insertion section (21) and the mounting section (22). The outer diameter of the mounting section (22) is equivalent to the inner diameter of the opening (11), and external threads meshing with the internal threads of the opening (11) are provided on the outer peripheral surface of the mounting section (22), so that the lens column (20) is installed in the opening (11) of the main structure (101). The light guiding structure (201) is a gradient diffraction-refraction type multi-focus structure; The middle part of the gradient diffraction-refraction type multi-focus light guiding structure (201) is a diffraction area (1017), and the surrounding part of the light guiding structure (201) is a refraction area (1018); The preparation process of the multi-focus artificial cornea includes the following steps: S1: Preparation of the lens column (20). Through turning on a lathe, the lens column (20) made of PMMA material is formed into a stepped cylindrical structure, and a gradient diffraction-refraction type multi-focus light guiding structure is formed on the lens column (20). The middle part of the light guiding structure (201) is a diffraction area, and the surrounding part of the light guiding structure (201) is a refraction area. External threads for installation are turned on the mounting section (22); S2: Preparation of the main structure (101) in the bracket (10). The main structure (101) made of PMMA is processed by a precision CNC lathe to realize the forming of the main structure in the bracket; S3: The plate is stamped to form an opening (11) in the middle of the main structure (101); S4: Turning on a lathe to form internal threads meshing with the external threads of the mounting section (22) on the inner peripheral wall of the opening (11) of the main structure (101); S5: Assembling the bracket (10) and the lens column (20). The lens column is installed into the opening (11) of the main structure (101) through the external threads on the mounting section (22) of the lens column.

4. A multifocal artificial cornea, characterized in that, It includes a bracket (10) and a lens column (20) connected to the bracket (10) in a matching manner. The bracket includes a main structure (101). An opening (11) is provided in the middle of the main structure (101). The lens column (20) is arranged in the opening (11). The outer peripheral dimension of the bracket (10) is 7 to 9 mm, and the thickness is 0.05 to 0.5 mm. The lens column (20) includes a light guiding structure (201) with multiple foci, so as to form corresponding multiple diopters when the light is zoomed through the light guiding structure (201). The lens column (20) is a stepped cylindrical structure made of PMMA material. The lens column (20) includes an insertion section (21), a mounting section (22) formed on the insertion section (21), and a light guiding section (23) formed on the mounting section (22). The insertion section (21), the mounting section (22), and the light guiding section (23) are coaxial, and the radial dimensions increase in sequence. A guiding surface (24) is formed at the connection between the insertion section (21) and the mounting section (22). The outer diameter of the mounting section (22) is equivalent to the inner diameter of the opening (11), and an external thread meshing with the internal thread of the opening (11) is provided on the outer peripheral surface of the mounting section (22), so that the lens column (20) is installed in the opening (11) of the main structure (101). The light guiding structure (201) is a gradient diffraction - refraction type multi - focus structure; One surface of the gradient diffraction - refraction type multi - focus light guiding structure (201) is a refraction surface (1015), and the other surface of the light guiding structure (201) is a diffraction surface (1016); The preparation process of the multi - focus artificial cornea includes the following steps: S1: Preparation of the lens column (20). Through turning processing on a lathe, the lens column (20) made of PMMA material is formed into a stepped cylindrical structure, and a gradient diffraction - refraction type multi - focus light guiding structure is formed on the lens column (20). One surface of the light guiding structure (201) is a refraction surface, and the other surface of the light guiding structure (201) is a diffraction surface. An external thread for mounting is machined on the mounting section (22); S2: Preparation of the main structure (101) in the bracket (10). The main structure (101) made of PMMA is processed by a precision CNC lathe to realize the forming of the main structure in the bracket; S3: The sheet material is stamped and formed so that an opening (11) is provided in the middle of the main structure (101); S4: Through turning processing on a lathe, an internal thread meshing with the external thread of the mounting section (22) is machined on the inner peripheral wall of the opening (11) of the main structure (101); S5: The bracket (10) and the lens column (20) are assembled. The lens column is installed into the opening (11) of the main structure (101) through the external thread on the mounting section (22) of the lens column.

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