Method for producing a toric intraocular lens

Abstract

The invention relates to a method for producing a toric intraocular lens (1) having an optical axis (10). The method has the steps of: a) providing a blank; and b) producing a first lens surface (2) and a second lens surface (3) which lies opposite the first lens surface (2) and through which light is to pass in order to optically image the intraocular lens by rotating the blank and thereby removing material from the blank using a first tool. The material is removed such that a first marking (4) is formed in the first lens surface and a second marking (5) is formed in the first lens surface (2) or the second lens surface (3), the markings characterize a meridian (6) of the toric intraocular lens, and the first marking (4) has an elevation (7) which protrudes from the first lens surface (2), a depression (8) which is introduced into the first lens surface (2), and / or a roughness region (9), said roughness region having a marking roughness of the first marking and said first lens surface (2) having a lens roughness which is present in an imaging region (13) of the first lens surface, said imaging region being situated at a distance to the first marking and the second marking.

Description

[0001] Method for manufacturing a toric intraocular lens

[0002] The invention relates to a method for manufacturing a toric intraocular lens.

[0003] In cataract surgery, an intraocular lens (IOL) replaces the eye's natural lens. The IOL can have a toric shape to correct astigmatism. For optimal correction of the astigmatism, the toric IOL must be inserted into the eye with the correct orientation. To achieve this, the toric IOL has a marking that allows the surgeon to orient the lens correctly within the eye. After the optical surfaces of the toric IOL have been manufactured, a further step is usually necessary to apply the marking. For example, a recess is drilled or milled to serve as the marking. It is also possible to apply an additional material to the IOL. The marking can also be engraved using a laser.The disadvantage is that the procedure is complex due to the additional step and that deviations in the marking and meridian of the toric intraocular lens can occur.

[0004] The object of the invention is therefore to create a method for manufacturing a toric intraocular lens that is not very complex and in which a meridian of the toric intraocular lens can be marked with high accuracy.

[0005] The inventive method for manufacturing a toric intraocular lens having an optical axis comprises the steps of: a) providing a blank; b) manufacturing a first lens surface and a second lens surface opposite the first lens surface, which light must pass through for optical imaging of the intraocular lens, wherein the first lens surface is manufactured by rotating the blank and removing material from the blank using a first tool, and the second lens surface is manufactured by rotating the blank and removing material from the blank using the first tool and / or a tool different from the first tool, wherein the material is removed in such a way thatthat a first marking is formed in the first lens surface and a second marking is formed in the first lens surface or the second lens surface, which designate a meridian with a lowest refractive power of the toric intraocular lens, wherein the first marking has a protrusion of the first marking from the first lens surface, a depression of the first marking provided in the first lens surface and / or a roughness region of the first marking, wherein the roughness region of the first marking has a marking roughness of the first marking and the first lens surface has a first lens roughness and the second lens surface has a second lens roughness, wherein the first lens roughness and the second lens roughness are located in an imaging area arranged away from the first and second markings.wherein the marking roughness of the first marking is different from the first lens roughness, wherein the second marking has a protrusion of the second marking from the first lens surface or the second lens surface, a depression of the second marking incorporated into the first lens surface or the second lens surface and / or a roughness area of ​​the second marking, wherein the roughness area of ​​the second marking has a marking roughness of the second marking, wherein the marking roughness of the second marking is different from the first lens roughness and the second lens roughness.

[0006] In the inventive method, the imaging area, the first marking, and the second marking are produced in the same process. This makes the method advantageously simple. Because the imaging area, the first marking, and the second marking are produced in the same process, the first and second markings can be aligned with the meridian with high accuracy. The imaging area is a region of the first lens surface and / or the second lens surface, excluding the areas formed by the first and second markings, when the intraocular lens is viewed from above in the direction of the optical axis. The first lens roughness can be identical to the second lens roughness or different from the second lens roughness.In this process, it is conceivable that the first lens surface is produced before or after the second lens surface.

[0007] Preferably, the material is removed using the first tool and optionally using a tool different from the first tool, so that the imaging area is created.

[0008] It is preferred that the raised area of ​​the first marking and / or the recessed area of ​​the first marking lies on the meridian when viewed along the optical axis, and / or that the raised area of ​​the second marking and / or the recessed area of ​​the second marking lies on the meridian when viewed along the optical axis. Alternatively or additionally, it is preferred that the roughness area of ​​the first marking and / or the roughness area of ​​the second marking lies on the meridian when viewed along the optical axis.

[0009] When producing the roughness area of ​​the first marking, the spacing of the paths of the first tool during turning of the blank is preferably chosen to be shorter in the imaging area than in the roughness area of ​​the first marking. When producing the roughness area of ​​the second marking, the spacing of the paths of the first tool or of a tool different from the first tool during turning of the blank is preferably chosen to be shorter in the imaging area than in the roughness area of ​​the second marking.Alternatively or additionally, it is preferred that the temperature of the first tool, the tool different from the first tool and / or the blank, when the first tool and / or the tool different from the first tool removes material from the imaging area, is different from the temperature of the first tool, the tool different from the first tool and / or the blank, when the first tool removes material from the roughness area of ​​the first marking and / or when the first tool or the tool different from the first tool removes material from the roughness area of ​​the second marking.Alternatively or additionally, it is preferred that, during the production of the roughness area of ​​the first marking and / or the roughness area of ​​the second marking, the first tool, the tool different from the first tool and / or the blank are set into vibration when the first tool removes material in the roughness area of ​​the first marking and / or when the first tool or the tool different from the first tool removes material in the roughness area of ​​the second marking.

[0010] It is preferred that in step b) in the case that the first marking and the second marking are provided on the first lens surface, the first marking, the second marking and the imaging area are produced in a single cut.

[0011] Alternatively, it is also conceivable that the image area is completed in a first cut, followed by a second cut. In the first cut, the first marking and / or the second marking could be partially completed by creating the raised and / or recessed areas of the first marking and / or the raised and / or recessed areas of the second marking. In the second cut, the first marking and / or the second marking could be completely completed. For example, the roughness area of ​​the first marking and / or the roughness area of ​​the second marking could be completed by removing material in the roughness area of ​​the first marking and / or the roughness area of ​​the second marking while switching off or changing the lubricant wetting the workpiece.Alternatively or additionally, it is conceivable that in step b), after a first part of the material has been removed from the blank using the first tool and optionally a tool different from the first, a second part of the material is removed using a second tool that is different from the first tool. In particular, the roughness area of ​​the first marking and / or the roughness area of ​​the second marking can be finished with the second tool. It is preferred that the first tool has a different shape than the second tool. Alternatively or additionally, it is preferred that the material of the first tool is different from the material of the second tool.It is also conceivable to provide a surface of the first marking and / or the second marking in the second section with a slope different from that of the imaging area, whereby the slope of the surface is chosen such that the surface is particularly visible in an operating microscope. For example, the surface can be flat. This allows for the creation of particularly visible reflections.

[0012] It is also conceivable that, when producing the roughness area of ​​the first marking and / or the roughness area of ​​the second marking, the spacing of the paths of the first tool during turning the blank in the imaging area is chosen to be shorter than the spacing of the second tool in the roughness area of ​​the first marking and / or the roughness area of ​​the second marking. Alternatively or additionally, it is conceivable that the temperature of the second tool and / or the blank, when the second tool removes material from the imaging area, differs from the temperature of the first tool and / or the blank when the first tool removes material from the roughness area of ​​the first marking and / or the roughness area of ​​the second marking.Alternatively or additionally, it is conceivable that when producing the roughness area of ​​the first marking and / or the roughness area of ​​the second marking, the second tool and / or the blank is set into vibration when the second tool removes material in the roughness area of ​​the first marking and / or in the roughness area of ​​the second marking.

[0013] It is preferred that the first marking is produced such that the roughness area of ​​the first marking is fully enclosed by the raised area of ​​the first marking or the recessed area of ​​the first marking and / or wherein the second marking is produced such that the roughness area of ​​the second marking is fully enclosed by the raised area of ​​the second marking or the recessed area of ​​the second marking.

[0014] The marking roughness of the first marking and / or the marking roughness of the second marking is preferably rougher than the first lens roughness and the second lens roughness. This makes the first marking and / or the second marking particularly visible. Furthermore, the marking roughness of the first marking and the marking roughness of the second marking can be equal.

[0015] It is preferred that the first lens surface is toric. The second lens surface is preferably planar, spherical, aspherical, or toric, or preferably has a diffraction structure. It is preferred that in step b) the second lens surface is produced by rotating the blank and removing material from it using a third tool. The third tool can be different from the first tool and / or the second tool, or the third tool can be the same as the first tool or the second tool. It is also conceivable that the first lens surface is spherical, aspherical, or planar, or has a diffraction structure, and that the second lens surface is toric.

[0016] The invention will be explained in more detail below with reference to the attached schematic drawings. These show

[0017] Figure 1 shows a top view of a first embodiment of a toric intraocular lens.

[0018] Figure 2 shows the longitudinal section AA from Figure 1 ,

[0019] Figure 3 shows a longitudinal section of a second embodiment of the toric intraocular lens.

[0020] Figure 4 shows a longitudinal section of a third embodiment of the toric intraocular lens.

[0021] Figure 5 shows a top view of a fourth embodiment of the toric intraocular lens.

[0022] Figure 6 shows the longitudinal section AA from Figure 5 and

[0023] Figure 7 shows a top view of a fifth embodiment of the toric intraocular lens.

[0024] Figures 1 to 7 show various embodiments of a toric intraocular lens 1 having an optical axis 10 (see Figures 1 and 4). Preferably, the intraocular lens 1 has one or more haptic elements (not shown in the figures). The intraocular lens 1 is manufactured by a process comprising the steps of: a) providing a blank; b) producing a first lens surface 2 and a second lens surface 3 opposite the first lens surface 2, which light passes through for optical imaging by the intraocular lens 1, by rotating the blank and removing material from it using a first tool, whereby the material is removed such that a first mark 4 and a second mark 5 are formed in the first lens surface 2, which define a meridian 6 with a lowest refractive power of the toric intraocular lens 1.The first marking 4 has a raised portion 7 of the first marking 4 projecting from the first lens surface 2 (see Figures 1, 2 and 4), a recess 8 of the first marking 4 incorporated into the first lens surface 2 (see Figures 3 and 5 to 7), and / or a roughness area 9 of the first marking 4 (see Figures 5 to 7). The roughness area 9 of the first marking 4 has a marking roughness of the first marking 4, and the first lens surface 2 has a first lens roughness located in an imaging area 13 situated away from the first marking 4 and the second marking 5. The second marking 5 has a raised portion 7 of the second marking 5 projecting from the first lens surface 2 (see Figures 1, 2 and 4), a recess 8 of the second marking 5 incorporated into the first lens surface 2 (see Figures 3 and 5 to 7) and / or a roughness area 9 of the second marking 5 (see Figures 5 to 7).The roughness area 9 of the second marking 5 has a marking roughness of the second marking 5. The marking roughness of the first marking 4 and the marking roughness of the second marking 5 are different from the first lens roughness and, in particular, rougher than the first lens roughness. The marking roughness of the first marking 4 and the marking roughness of the second marking 5 can be the same.

[0025] Alternatively, instead of forming the second marking 5 on the first lens surface 2, the second marking 5 can be formed on the second lens surface 3 (not shown in the figures). For this purpose, in step b), the second lens surface 3 can be produced by rotating the blank and removing material from it using the first tool and / or a tool different from the first. The second lens surface 3 has a second lens roughness that is the same as or different from the first lens roughness and is located in the area shown in Figure 13. The marking roughness of the second marking 5 is different from both the first and second lens roughnesses.The second marking 5 can, for example, have a raised portion 7 of the second marking 5 projecting from the second lens surface 3 or a recess 8 of the second marking 5 incorporated into the second lens surface 3.

[0026] The imaging area 13 can be an area of ​​the first lens surface 2 and / or the second lens surface 3 minus the areas formed by the first marking 4 and the second marking 5 when the intraocular lens 1 is viewed from above in the direction of the optical axis 10.

[0027] The first marker 4 and the second marker 5 can be arranged separately from each other. The first marker 4 and the second marker 5 can be arranged on opposite sides of the optical axis 10, see Figures 1 to 7. In other words, the second marker 5 can be arranged in a radial direction 11 relative to the optical axis 10, and the first marker 4 can be arranged opposite the radial direction 11 relative to the optical axis 10 (see Figure 1).

[0028] In a first embodiment of the toric intraocular lens 1 (see Figures 1 and 2) and a third embodiment of the toric intraocular lens 1 (see Figure 4), the first marking 4 has the elevation 7 of the first marking 4, and the second marking 5 has the elevation 7 of the second marking 5. The elevation 7 of the first marking 4 and the elevation 7 of the second marking 5 can lie on the meridian 6 when viewed in the direction of the optical axis 10. In the first embodiment, the elevation 7 of the first marking 4 and the elevation 7 of the second marking 5 are curved, in particular, completely curved. In the third embodiment, the elevation 7 of the first marking 4 and the elevation 7 of the second marking 5 each have a flat surface. The flat surface can have a normal that forms an angle with the optical axis, which lies in a range of 0° to 30° or 0° to 10°.In the first and third versions, it is conceivable that roughness range 9 is not provided.

[0029] In a second embodiment of the toric intraocular lens 1 (see Figure 3), the first marking 4 has the recess 8 of the first marking 4, and the second marking 5 has the recess 8 of the second marking 5. The recess 8 of the first marking 4 and the recess 8 of the second marking 5 can lie on the meridian 6 when viewed in the direction of the optical axis 10. The recess 8 of the first marking 4 and the recess 8 of the second marking 5 can be curved, in particular fully curved (see Figure 3). Alternatively, it is conceivable that the recess 8 of the first marking 4 and the recess 8 of the second marking 5 each have a flat surface. The flat surface can have a normal that forms an angle with the optical axis, which lies in a range of 0° to 30° or from 0° to 10°. In the second version, it is conceivable that roughness area 9 is not provided.

[0030] In a fourth embodiment of the toric intraocular lens 1 (see Figures 5 and 6) and in a fifth embodiment of the toric intraocular lens 1 (see Figure 7), the first marking 4 has the roughness area 9 of the first marking 4, and the second marking 5 has the roughness area 9 of the second marking 5. The roughness area 9 of the first marking 4 and / or the roughness area 9 of the second marking 5 can lie on the meridian 6 when viewed in the direction of the optical axis 10. Furthermore, the roughness area 9 of the first marking 4 can be bounded by the recess 8 of the first marking 4, and / or the roughness area 9 of the second marking can be bounded by the recess 8 of the second marking 5.In the fourth embodiment, the roughness area 9 of the first marking 4 is completely enclosed by the recess 9 of the first marking 4, and the roughness area 9 of the second marking 5 is completely enclosed by the recess 9 of the second marking 5. In the fifth embodiment, the roughness area 9 of the first marking 4 is not completely enclosed by the recess 8 of the first marking 4, but is only bounded by the recess 9 of the first marking 4 in a circumferential direction 12 relative to the optical axis 10 and opposite to the circumferential direction 12. Similarly, in the fifth embodiment, the roughness area 9 of the second marking 5 is not completely enclosed by the recess 8 of the second marking 5, but is only bounded by the recess 9 of the second marking 5 in a circumferential direction 12 and opposite to the circumferential direction 12.

[0031] It is conceivable to complete the image area 13 in a first cut using the first tool, as well as to fully or partially complete the first marking 4 and the second marking 5. If the first marking 4 and the second marking 5 are only partially completed in the first cut, a second cut can be made in which the first marking 4 and the second marking 5 are completed. The second cut can be made with the first tool or with a second tool that is different from the first tool. The second tool can have a different shape and / or be made of a different material than the first tool. This allows the roughness area 9 of the first marking 4 and / or the roughness area 9 of the second marking 5 to be produced.The material of the first tool and / or the material of the second tool may be a hard metal, boron nitride, in particular cubic boron nitride, and / or diamond. The roughness area 9 of the first marking 4 and / or the roughness area 9 of the second marking 5 can be produced by ensuring that the spacing of the paths of the first tool or the second tool is longer than the spacing of the paths when producing the image area 13. The roughness area 9 of the first marking 4 and / or the roughness area 9 of the second marking 5 can also be produced by using no lubricant or a different lubricant than that used when producing the image area 13 when producing the roughness area 9 of the first marking 4 and / or the roughness area 9 of the second marking 5.The roughness area 9 of the first mark 4 and / or the roughness area 9 of the second mark 5 can also be produced by setting a higher or lower temperature of the blank and / or the first or second tool than when producing the image area 13. The roughness area 9 of the first mark 4 and / or the roughness area 9 of the second mark 5 can also be produced by vibrating the blank, the first tool, and / or the second tool during the production of the roughness area 9 of the first mark 4 and / or the roughness area 9 of the second mark 5.

[0032] The first lens surface 2 can be toric. The second lens surface 3 can, for example, be planar, spherical, aspherical, or toric, or have a diffraction structure. In step b), the second lens surface 3 can be produced by rotating the blank and removing material from it using a third tool. Reference list

[0033] 1 Intraocular lens

[0034] 2 first lens surface 3 second lens surface

[0035] 4 first marker

[0036] 5 second marker

[0037] 6 Meridian

[0038] 7 Increase 8 Deepening

[0039] 9 Roughness area

[0040] 10 optical axis

[0041] 11 Radial direction

[0042] 12 Circumferential direction 13 Imaging area

Claims

Patent claims 1. Method for manufacturing a toric intraocular lens (1) with an optical axis (10), comprising the steps of: a) providing a blank; b) manufacturing a first lens surface (2) and a second lens surface (3) opposite the first lens surface (2), which light passes through for optical imaging of the intraocular lens (1), wherein the first lens surface (2) is manufactured by rotating the blank and removing material from the blank using a first tool, and the second lens surface (3) is manufactured by rotating the blank and removing material from the blank using the first tool and / or a tool different from the first tool, wherein the material is removed in such a manner thatthat a first marking (4) is formed in the first lens surface (2) and a second marking (5) is formed in the first lens surface (2) or the second lens surface (3), which designate a meridian (6) with a lowest refractive power of the toric intraocular lens (1), wherein the first marking (4) has a raised area (7) projecting from the first lens surface (2), a recessed area (8) of the first marking (4) in the first lens surface (2) and / or a roughness area (9) of the first marking (4), wherein the roughness area (9) of the first marking (4) has a marking roughness of the first marking (4) and the first lens surface (2) has a first lens roughness and the second lens surface (3) has a second lens roughness,wherein the first lens roughness and the second lens roughness are located in an imaging area (13) arranged away from the first marking (4) and the second marking (5), wherein the marking roughness of the first marking (4) is different from the first lens roughness, wherein the second marking (5) is a protrusion (7) of the second lens surface (2) or the second lens surface (3) projecting from the first lens surface (2) or the second lens surface (3), marking (5) , a depression (8) of the second marking (5) provided in the first lens surface (2) or the second lens surface (3) and / or a roughness area (9) of the second marking (5), wherein the roughness area (9) of the second marking (5) has a marking roughness of the second marking (5), wherein the marking roughness of the second marking (5) is different from the first lens roughness and the second lens roughness.

2. Method according to claim 1, wherein the raised area (7) of the first marking (4) and / or the recessed area (8) of the first marking (4) lies on the meridian (6) as seen in the direction of the optical axis (10) and / or wherein the raised area (7) of the second marking (5) and / or the recessed area (8) of the second marking (5) lies on the meridian (6) as seen in the direction of the optical axis (10).

3. Method according to claim 1 or 2, wherein the roughness area (9) of the first marking (4) and / or the roughness area (9) of the second marking (5) lie on the meridian (6) as seen in the direction of the optical axis (10).

4. A method according to any one of claims 1 to 3, wherein, when producing the roughness area (9) of the first marking (4), the spacing of the paths of the first tool is selected to be shorter when rotating the blank in the imaging area (13) than in the roughness area (9) of the first marking (4), and / or wherein, when producing the roughness area (9) of the second marking (5), the spacing of the paths of the first tool or of the tool different from the first tool is selected to be shorter when rotating the blank in the imaging area. (13) shorter than in the roughness area (9) of the second marking (5).

5. Method according to any one of claims 1 to 4, wherein the temperature of the first tool, the tool different from the first tool and / or the blank, when the first tool and optionally the tool different from the first tool The tool that removes material from the image area (13) is different from the temperature of the first tool, the tool different from the first tool and / or the blank, when the first tool removes material from the roughness area (9) of the first mark (4) and / or when the first tool or the tool different from the first tool removes material from the roughness area (9) of the second mark (5).

6. Method according to any one of claims 1 to 5, wherein, in producing the roughness area (9) of the first marking (4) and / or the roughness area (9) of the second marking (5), the first tool, the tool different from the first tool and / or the blank are set into vibration when the first tool removes material in the roughness area (9) of the first marking (4) and / or when the first tool or the tool different from the first tool removes material in the roughness area (9) of the second marking (5).

7. Method according to any one of claims 1 to 6, wherein in step b) in the case that the first marking (4) and the second marking (5) are provided on the first lens surface (2), the first marking (4), the second marking (5) and the imaging area (13) are produced in a single cut.

8. Method according to any one of claims 1 to 6, wherein the roughness area (9) of the first marking (4) and / or the roughness area (9) of the second marking (5) is finished by removing the material in the roughness area (9) of the first marking (4) and / or in the roughness area (9) of the second marking (5) under a shutdown or a change of a lubricant wetting the blank.

9. A method according to any one of claims 1 to 6 and 8, wherein in step b) , after using the first tool a first part of the material has been removed from the blank, a second part of the material is removed using a second tool that is different from the first tool, and thus the roughness area (9) of the first marking (4) and / or the roughness area (9) of the second marking (5) is completed.

10. Method according to claim 9, wherein the first tool has a different shape than the second tool and / or wherein the material of the first tool is different from the material of the second tool.

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