Implantable contact lens

Abstract

The invention discloses an implantable contact lens which comprises an optical lens area and a connecting accessory arranged on the periphery of the optical lens area, a center hole is formed in the center of the optical lens area, and the edge contour of the center hole is of a continuously-bent multi-order rotational symmetric curved edge structure. And a soft-edge diaphragm is formed in the center of the optical lens area. According to the implantable contact lens, the light passing through the central hole can be modulated by using the soft-edge diaphragm, so that the width of the light beam is kept in a stable range, the aperture effect generated by aperture diffraction is effectively reduced, the aperture phenomenon caused by the aperture is eliminated or weakened, and the visual imaging quality is improved.

Description

Technical Field

[0001] This application belongs to the technical field of ophthalmic implants, and particularly relates to an implantable contact lens. Background Art

[0002] Conventional myopia correction surgeries have the disadvantages of being unable to correct ultra-high myopia and being irreversible. In contrast, ICL (implantable collamer lens) has many advantages, such as not cutting corneal tissue, having a wider correction range, being implantable in the eye for a long time, and being able to be removed or replaced at any time. Since the first successful ICL implantation in 1997, with the improvement of technology and the in-depth clinical research, ICL has become a safe, effective and popular technical option.

[0003] In order to avoid the obstruction of aqueous humor circulation caused by ICL implantation, ICLs with central holes have emerged in the prior art to improve the aqueous humor flow and reduce the occurrence probability of cataracts and pupillary block glaucoma. However, due to the diffraction phenomenon of light, light bends at the edge of the small hole, making the edge of the image blurred, generating an aperture, which affects the visual quality of patients. Summary of the Invention

[0004] The purpose of this application is to provide an implantable contact lens to solve the technical problem that the central hole of the ICL in the prior art generates an aperture due to the diffraction phenomenon of light, which affects the visual quality of patients.

[0005] To achieve the above purpose, the first aspect of this application provides an implantable contact lens, including an optical lens area and an attachment arranged around the periphery of the optical lens area. A central hole is arranged at the center of the optical lens area, and the edge contour of the central hole is a continuously bent multi-order rotationally symmetric curved edge structure to form a soft-edge diaphragm at the center of the optical lens area.

[0006] In one or more embodiments, the edge contour of the central hole includes unit structures arranged continuously in the circumferential direction, and the unit structure is a triangular serrated shape, a square tooth shape, a sine tooth shape, a Gaussian tooth shape, a circular arc shape, a concave semi-circular shape or a convex semi-circular shape.

[0007] In one or more embodiments, the edge contour of the central hole includes 20 to 150 of the unit structures.

[0008] In one or more embodiments, the extension length of the unit structure in the radial direction of the central hole is 0.05 to 0.15 times the radius of the central hole.

[0009] In one or more embodiments, the diameter of the central hole is 350 to 450 μm.

[0010] In one or more embodiments, in the direction in which the connection attachment points to the central hole, the thickness of the edge region of the central hole gradually decreases.

[0011] In one or more embodiments, the edge thickness of the central hole is 0.01 - 0.5 mm.

[0012] In one or more embodiments, the optical lens region includes a first surface and a second surface that are oppositely arranged. Both the first surface and the second surface have an optical center. The optical lens region further includes an optical axis passing through the optical centers of the first surface and the second surface. The distance between the central axis of the central hole and the optical axis is less than 0.02 mm.

[0013] In one or more embodiments, the first surface is a convex surface that bulges outward, and the second surface is a concave surface that concaves inward. The two are combined to form a convex-concave lens structure. Among them, the radius of curvature of the first surface is greater than that of the second surface.

[0014] In one or more embodiments, the connection attachment includes an optical fixation region and a plurality of connection regions arranged outside the optical fixation region. The optical fixation region surrounds the optical lens region and has a thickness greater than that of the optical lens region. The shape of the optical fixation region is an arch that bulges toward the incident side to form a light-gathering structure.

[0015] In one or more embodiments, the thickness of the connection region is less than that of the optical lens region.

[0016] In one or more embodiments, the connection regions are symmetrically arranged on both sides of the optical fixation region.

[0017] Different from the prior art, the beneficial effects of this application are:

[0018] A central hole is provided in the center of the optical lens region of the implantable contact lens of this application. The edge contour of the central hole is a multi-order rotationally symmetric curved edge structure with continuous bends, thereby forming a soft-edge diaphragm in the center of the optical lens region. The soft-edge diaphragm can be used to modulate the light passing through the central hole, keep the width of the light beam within a stable range, effectively reduce the aperture effect caused by small-hole diffraction, eliminate or weaken the aperture phenomenon caused by the small hole, and improve the visual imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is the imaging schematic diagram of an existing implantable contact lens;

[0021] Figure 2 is the structural schematic diagram of an embodiment of the implantable contact lens of the present application;

[0022] Figure 3 is the structural schematic diagram of another embodiment of the implantable contact lens of the present application;

[0023] Figure 4 is the structural schematic diagram of yet another embodiment of the implantable contact lens of the present application;

[0024] Figure 5 is the structural schematic diagram of yet another embodiment of the implantable contact lens of the present application;

[0025] Figure 6 is the structural schematic diagram of yet another embodiment of the implantable contact lens of the present application;

[0026] Figure 7 is Figure 2 the cross-sectional structural schematic diagram of the A-A plane in

[0027] Figure 8 is Figure 2 the cross-sectional structural schematic diagram of B-B in

[0028] Figure 9 is the Fresnel diffraction pattern of Comparative Example 1;

[0029] Figure 10 is the Fresnel diffraction pattern of Examples 1 to 11;

[0030] Figure 11 is the Fresnel diffraction pattern of Examples 12 to 14;

[0031] Figure 12 is the Fresnel diffraction pattern of Examples 15 to 17.

[0032] As shown in the figure:

[0033] Optical lens region 100; central hole 101; first surface 102; second surface 103; connecting attachment 200; optical fixing region 201; connecting region 202;

[0034] Aperture 300. Specific embodiments

[0035] To enable those skilled in the art to better understand the technical solutions in this application, the following will clearly and completely describe the technical solutions in the embodiments of this application in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0036] Currently, ICLs with small holes in the center are gradually becoming popular. The small holes can effectively improve the aqueous humor circulation and reduce the incidence of cataracts and pupillary block glaucoma. However, due to the diffraction phenomenon of light, light is likely to bend at the edge of the small hole, making the edge of the image blurred and generating an aperture.

[0037] Specifically, please refer to Figure 1 , Figure 1 which is a schematic diagram of the imaging of an existing implantable contact lens. As Figure 1 shown, when the light emitted by an object passes through a small hole, an inverted real image will be formed on the light screen behind the small hole; ideally, the small hole is small enough, and the light rays from the same point of the object converge into a point on the light screen after passing through the small hole, and numerous such points form the image of the object.

[0038] However, when the small hole is not an ideal point light source passing structure, an aperture 300 will be generated; if the edge of the small hole is not sharp enough or the size of the small hole is relatively large, when the light passes through the small hole, an effect similar to that of a diaphragm will appear. Due to the diffraction phenomenon of light, the light will bend at the edge of the small hole, making the edge of the image blurred and generating an aperture; from the perspective of wave optics, light has wave properties; according to the Huygens-Fresnel principle, every point on the wavefront can be regarded as a new secondary wave source during the propagation of light; when the light passes through the small hole, these secondary waves will interfere with each other; if the edge of the small hole is uneven or the aperture is large, the interference of the secondary waves will cause light and dark alternating apertures 300 to appear around the image; the shape and roughness of the edge of the small hole will affect the generated aperture.

[0039] To solve the above problems, the applicant has developed a new type of implantable contact lens that effectively eliminates or weakens the aperture brought by the small hole through the diaphragm principle.

[0040] Specifically, please refer to Figure 2 , Figure 2 which is a schematic structural diagram of an embodiment of the implantable contact lens of this application.

[0041] As Figure 2 shown, the implantable contact lens includes an optical lens area 100 in the middle and an attachment accessory 200 arranged on the periphery of the optical lens area 100.

[0042] Among them, a central hole 101 is arranged at the center of the optical lens area 100, and the edge contour of the central hole 101 is a multi-order rotationally symmetric curved edge structure with continuous bending, so as to form a soft-edge diaphragm at the center of the optical lens area 100.

[0043] Among them, the multi-order rotationally symmetric curved edge structure means that the central hole 101 can coincide with itself after rotating a certain angle. When the edge contour of the central hole 101 is an n-order rotationally symmetric curved edge structure, the central hole 101 can coincide with itself after rotating an angle of 360° / n. Continuous bending means that the edge contour of the central hole 101 includes continuous outward or inward concave structures.

[0044] Based on the design of the edge contour of the central hole 101, a soft-edge diaphragm located at the center can be formed. The soft-edge diaphragm can control the shape and size of the light beam passing through the diaphragm, reduce the fluctuation and beam width change of the light beam, keep the width of the light beam within a stable range, modulate the incident light, effectively reduce the aperture effect generated by small hole diffraction, and eliminate or weaken the aperture phenomenon caused by the small hole.

[0045] Specifically, in this embodiment, the edge contour of the central hole 101 includes unit structures arranged continuously along the circumferential direction, and among them, the unit structure is a triangular serrated protrusion.

[0046] In other embodiments, the edge contour of the central hole 101 can also be other shapes that can achieve the soft-edge diaphragm effect. Exemplarily, please refer to Figure 3 , Figure 3 which is a schematic structural diagram of another embodiment of the implantable contact lens of the present application.

[0047] As Figure 3 shown, the edge contour of the central hole 101 in the optical lens area 100 can also be continuously square-toothed, that is, the unit structure is square-toothed, and the effect of this embodiment can also be achieved.

[0048] Or, please refer to Figure 4 , Figure 4 which is a schematic structural diagram of another embodiment of the implantable contact lens of the present application. As Figure 4 shown, the edge contour of the central hole 101 in the optical lens area 100 can also be continuously arc-shaped, that is, the unit structure is arc-shaped, and the effect of this embodiment can also be achieved.

[0049] Or, please refer to Figure 5 , Figure 5 which is a schematic structural diagram of another embodiment of the implantable contact lens of the present application. As Figure 5 shown, the edge contour of the central hole 101 in the optical lens area 100 can also be continuously outward convex circular, that is, the unit structure is outward convex semi-circular.

[0050] Alternatively, please refer to Figure 6 , Figure 6 which is a schematic structural diagram of another embodiment of the implantable contact lens of the present application. As shown in Figure 6 , the edge profile of the central hole 101 of the optical lens region 100 can also be a continuously concave circular shape, that is, the unit structure is a concave semi-circular shape.

[0051] It should be noted that the above embodiments are only exemplary descriptions. In other embodiments, the edge profile of the central hole 101 of the optical lens region 100 can also be a continuous sinusoidal tooth shape, a continuous Gaussian tooth shape, a continuous concave circular shape, etc., and the effects of the present embodiment can be achieved.

[0052] In one embodiment, the edge profile of the central hole 101 can include 20 to 150 unit structures, and the extension length of each unit structure in the radial direction of the central hole 101 can be 0.05 to 0.15 times the radius of the central hole 101.

[0053] In one embodiment, in order to avoid affecting the visual quality, the diameter of the central hole 101 can be 350 to 450 μm.

[0054] Furthermore, please refer to Figure 7 , Figure 7 which is Figure 2 the cross-sectional structural diagram of the A-A plane in

[0055] As shown in Figure 7 , in the present embodiment, the optical lens region 100 includes a first surface 102 and a second surface 103 arranged opposite to each other. Among them, the first surface 102 can be the incident surface of light, and the second surface 103 can be the exit surface of light. Both the first surface 102 and the second surface 103 have an optical center a, b, and the optical lens region 100 includes an optical axis ab passing through the optical centers of the first surface 102 and the second surface 103.

[0056] To ensure precise control of light focusing and imaging after implantation in the eye, the distance between the central axis of the central hole 101 and the optical axis should be less than 0.02 mm.

[0057] Furthermore, the first surface 102 can be a convex surface that bulges outward, and the second surface 103 is a concave surface that concaves inward. The two are combined to form a convex-concave lens structure. Among them, the radius of curvature of the first surface 102 is greater than that of the second surface 103, so that the overall optical lens region 100 is in a crescent shape, playing an effective role in focusing and imaging.

[0058] Furthermore, as shown in Figure 7As shown, in the direction where the connecting attachment 200 points to the central hole 101, the thickness of the edge region of the central hole 101 gradually decreases, so as to reduce the scattering and reflection of light at the edge of the central hole 101, further optimize the propagation characteristics of light in the small hole, and improve the visual imaging effect.

[0059] In particular, the thickness of the edge of the central hole 101 can be 0.01 - 0.5 mm, so as to reduce the scattering and reflection of light at the edge of the central hole 101.

[0060] It should be noted that in this embodiment, the region of the second surface 103 close to the central hole 101 protrudes towards the first surface 102 with a larger curvature relative to other parts, so that the thickness of the edge region of the central hole 101 gradually decreases in the direction where the connecting attachment 200 points to the central hole 101; in other embodiments, it can also be that the region of the first surface 102 close to the central hole 101 protrudes outward with a smaller curvature relative to other parts, and so on, as long as the thickness of the edge region of the central hole 101 can be gradually decreased along the axial direction pointing to the central hole 101, the effects of this embodiment can be achieved.

[0061] Based on the design of the central hole 101 in the above embodiments, the soft-edge aperture can be used to modulate the light passing through the central hole 101, keep the width of the light beam within a stable range, effectively reduce the aperture effect caused by small-hole diffraction, and eliminate or weaken the aperture phenomenon caused by the small hole.

[0062] The following further introduces the structure of the connecting attachment 200 of the present application. Please continue to refer to Figure 2 , in this embodiment, the connecting attachment 200 includes an optical fixing area 201 and a plurality of connecting areas 202 arranged outside the optical fixing area 201.

[0063] Among them, the optical fixing area 201 is arranged around the optical lens area 100 and is used to connect the connecting area 202 and the optical lens area 100, playing a role in fixing the optical lens area 100.

[0064] The connecting area 202 is used to be embedded in the ciliary sulcus behind the iris to fix the implantable contact lens, ensure that the optical lens area 100 is at the pupil center position and maintains the correct posture, so as to achieve the expected vision correction effect.

[0065] In one embodiment, the thickness of the connecting area 202 can be less than that of the optical lens area 100 and the optical fixing area 201, so that the connecting area 202 has higher flexibility and is convenient for adjusting its curvature during the operation.

[0066] Please refer to Figure 8 , Figure 8 is Figure 2 the schematic cross-sectional structure diagram of B - B inFigure 8 As shown in the figure, in this embodiment, the optical fixing area 201 as a whole has an arched structure protruding toward the incident side. This arched structure design enables the optical fixing area 201 to have a certain curvature. When light passes through the optical fixing area 201, the optical fixing area 201 can better guide the light, optimize the light collection and transmission paths, and contribute to improving the light transmittance performance of the entire contact lens.

[0067] In one embodiment, the implantable contact lens of the present application can be processed by micro-nano processing technologies such as high-precision ion beam processing technology, femtosecond laser processing technology, dry and wet etching, and single-point diamond turning to process a contact lens blank with curved-edge small holes, and then through a post-processing process, the finished contact lens that can be implanted into the eye is obtained through steps such as polishing, cleaning, and disinfection. During the processing, the shape, size, and position accuracy of the small holes can be precisely controlled, and the shape accuracy error is within 0.02 mm.

[0068] In one embodiment, the implantable contact lens of the present application can be implanted into the eye through a matching implant tool. Among them, the implant tool can have a clamping part that matches the shape and size of the contact lens and a monitoring device for monitoring the implantation position and state of the contact lens.

[0069] The clamping component can ensure that the central soft-edge diaphragm of the contact lens is in a predetermined orientation and angle during the implantation process. The monitoring device can real-time feedback the position information of the contact lens relative to the internal structure of the eyeball, and its position monitoring accuracy is within 0.01 - 0.02 mm, so as to ensure precise control of light focusing and imaging after implantation in the eye.

[0070] The beneficial effects of the present application will be further elaborated in detail below with specific embodiments.

[0071] Examples 1 to 11:

[0072] An implantable contact lens, the structure is as Figure 2 shown. Among them, the diameters of the central holes in Examples 1 to 11 are 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450 μm respectively; the height of the triangular sawteeth is 0.1 times the radius of the central hole, the width of the triangular sawteeth is 0.01 times the circumference of the central hole, and the edge contour of the central hole includes 100 triangular sawteeth.

[0073] Examples 12 to 14:

[0074] An implantable contact lens, the structure is as Figure 5As shown, among them, the diameters of the central holes in Examples 12 to 14 are all 400 μm, the height of the outward convex semi - circle is 0.1 times the radius of the central hole, and the edge contours of the central holes in Examples 12 to 14 include 20, 50, and 100 outward convex semi - circles respectively.

[0075] Examples 15 to 17:

[0076] An implantable contact lens, the structure is as Figure 6 shown, among them, the diameters of the central holes in Examples 12 to 14 are all 400 μm, the depth of the inward concave semi - circle is 0.1 times the radius of the central hole, and the edge contours of the central holes in Examples 15 to 17 include 20, 50, and 100 inward concave semi - circles respectively.

[0077] Comparative Example 1:

[0078] An implantable contact lens, the structure is basically the same as that in Example 6, the diameter of the central hole is 400 μm, the difference is that:

[0079] The edge of the central hole is circular and there are no triangular serrations.

[0080] Effect Example:

[0081] Perform Fresnel diffraction experiments on the implantable contact lenses of Examples 1 to 17 and Comparative Example 1. The experimental parameters are as follows: the wavelength of the light source is 632.8 nm, the ratio of the diffraction screen to the central hole is 1:10, and the observation distance is 5 cm. The Figures 9 to 12 obtained Fresnel diffraction patterns are as follows, among which, Figure 9 is the Fresnel diffraction pattern of Comparative Example 1, Figure 10 is the Fresnel diffraction pattern of Examples 1 to 11, Figure 11 is the Fresnel diffraction pattern of Examples 12 to 14, Figure 12 is the Fresnel diffraction pattern of Examples 15 to 17.

[0082] As Figure 9 shown, there are obvious light circles in the Fresnel diffraction pattern of Comparative Example 1. This is due to the diffraction phenomenon of light. Light will bend at the edge of the small hole, making the edge of the image blurred and generating light circles.

[0083] As Figure 10 shown, the light circles are basically invisible in the Fresnel diffraction patterns of Examples 1 to 17 where the edge contour of the central hole is a continuous triangular serration. When the diameter of the central hole changes from 350 to 450 μm, the overall light - circle removal effect remains basically unchanged, but there are some detailed changes in the center. The main change is that when the radius of the central hole changes, it will cause a change in the light - intensity distribution.

[0084] As Figure 11As shown, in the Fresnel diffraction patterns of Embodiments 12 to 14 where the edge profile of the central hole is a continuous outward convex semi-circle, there is no obvious aperture, and the diffraction rings can be significantly removed. Among them, the blurring effect on the aperture located in the middle is optimal.

[0085] As Figure 12 shown, in the Fresnel diffraction patterns of Embodiments 15 to 15 where the edge profile of the central hole is a continuous inward concave semi-circle, there is no obvious aperture, and the diffraction rings can be significantly removed. Among them, the blurring effect on the aperture located in the middle is optimal.

[0086] For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present application, the present application can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present application is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0087] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An implantable contact lens, characterized in that: It includes an optical lens area and connecting accessories arranged on the periphery of the optical lens area. A central hole is arranged in the center of the optical lens area. The edge profile of the central hole is a continuously bent multi-order rotationally symmetrical curved edge structure to form a soft-edge aperture in the center of the optical lens area.

2. The implantable contact lens according to claim 1, characterized in that The edge profile of the central hole includes unit structures continuously arranged along the circumferential direction, and the unit structures are triangular sawtooth, square tooth, sinusoidal tooth, Gaussian tooth, circular arc, concave semicircle or convex semicircle.

3. The implantable contact lens according to claim 2, characterized in that The edge profile of the central hole includes 20 to 150 unit structures; and / or, The extension length of the unit structure in the radial direction of the central hole is 0.05 to 0.15 times the radius of the central hole.

4. The implantable contact lens according to claim 1, characterized in that The diameter of the central hole is 350-450 μm.

5. The implantable contact lens according to claim 1, characterized in that In a direction from the engagement attachment toward the central hole, the thickness of the edge region of the central hole gradually decreases.

6. The implantable contact lens according to claim 1, characterized in that The edge thickness of the central hole is 0.01-0.5 mm.

7. The implantable contact lens according to claim 1, characterized in that The optical lens area includes a first surface and a second surface arranged opposite to each other, each of the first surface and the second surface has an optical center, and the optical lens area also includes an optical axis passing through the optical centers of the first surface and the second surface, and the distance between the central axis of the center hole and the optical axis is less than 0.02 mm.

8. The implantable contact lens according to claim 7, characterized in that The first surface is an outwardly convex surface, and the second surface is an inwardly concave surface, and the two are combined to form a convex-concave lens structure, wherein the curvature radius of the first surface is greater than that of the second surface.

9. The implantable contact lens according to claim 1, characterized in that The connection attachment includes an optical fixing area and a plurality of connection areas arranged around the optical fixing area. The optical fixing area is arranged around the optical lens area and has a thickness greater than that of the optical lens area. The shape of the optical fixing area is an arch convex toward the incident side to form a focusing structure.

10. The implantable contact lens according to claim 9, characterized in that The thickness of the connecting area is smaller than that of the optical lens area; and / or, The connection areas are symmetrically arranged on both sides of the optical fixing area.

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