Ophthalmic lens and process for manufacturing thereof
By distributing scattering clusters in the auxiliary area of ophthalmic lenses and etching microstructures using a laser etching machine, combined with specific lattice and random design, the problems of discomfort and weakened accommodation effect of existing lenses are solved, achieving a safer and more effective myopia control effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 张维
- Filing Date
- 2024-12-31
- Publication Date
- 2026-06-30
AI Technical Summary
Existing myopia control lenses are prone to causing discomfort during use and their accommodative effect weakens over time, lacking a safe and effective solution.
Design an ophthalmic lens. The lens body includes a central region and an auxiliary region surrounding the central region. Scattering clusters are distributed in the auxiliary region and are formed by translation according to a preset period. Each scattering cluster consists of multiple microstructures arranged according to a spatial lattice configuration. The microstructures are etched on the lens using a laser etching machine. By combining a specific lattice configuration with random design, the light scattering performance can be precisely controlled by adjusting the duty cycle of the microstructures.
It enhances light scattering, reduces angular resolution, improves lens uniformity and applicability, avoids the impact of periodic artifacts on optical performance, and achieves safer and more effective myopia control.
Smart Images
Figure CN122307941A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optometry technology, and more particularly to an ophthalmic lens and its manufacturing process. Background Technology
[0002] With the widespread use of electronic products in recent years, the probability of people developing myopia is increasing, especially among teenagers and children, whose rate of myopia is rising year by year. Currently, the recognized prevention and control methods mainly include three types: atropine eye drops, orthokeratology lenses (OK lenses), and lenses with defocusing function. Atropine eye drops and orthokeratology lenses come into direct contact with the patient's eyeball, which can easily cause discomfort, while the effect of defocusing lenses on adjusting myopia gradually weakens with prolonged wear.
[0003] Therefore, how to provide an ophthalmic lens that can more safely and effectively prevent and control myopia, and its manufacturing process, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention
[0004] This invention provides an ophthalmic lens and its manufacturing process to solve the above-mentioned technical problems.
[0005] To solve the above-mentioned technical problems, the present invention provides an ophthalmic lens, including a lens body, the lens body including a central region and an auxiliary region disposed around the central region, the auxiliary region having a plurality of scattering clusters formed by translation according to a preset period, each scattering cluster being composed of multiple microstructures arranged according to a spatial lattice configuration.
[0006] Preferably, the preset period is 400μm±50μm.
[0007] Preferably, the scattering cluster is constructed by randomly adding offsets according to the preset period.
[0008] Preferably, the diameter of the scattering cluster is less than or equal to 100 μm.
[0009] Preferably, the main lattice of the spatial lattice configuration of the microstructure is a triangular lattice or a square lattice.
[0010] Preferably, each scattering cluster contains 7 to 9 microstructures.
[0011] Preferably, the diameter of each of the microstructures is 30 μm ± 1 μm.
[0012] The present invention also provides a manufacturing process for the ophthalmic lens as described above, comprising the following steps:
[0013] Step 1: Place the lens body on the stage of the laser etching machine and fix it with a clamp; move the laser lens to align the center of the laser lens with the center of the lens body;
[0014] Step 2: Adjust the laser parameters, which include at least the laser wavelength, power, and the height and speed of the galvanometer;
[0015] Step 3: Use a laser to etch the microstructure onto the lens body.
[0016] Preferably, in step 2, the wavelength of the laser is set to 0.355 μm, and the power of the laser is set to 5 to 10 watts.
[0017] Preferably, step 3 includes:
[0018] Step 31: Design the structural model of the auxiliary area and save it as a dxf file;
[0019] Step 32: Import the DXF format file into the laser etching machine to complete the graphic verification and confirmation;
[0020] Step 33: Complete the pre-etching with low-power red light;
[0021] Step 34: Start etching. The laser etching machine processes the corresponding pattern in the auxiliary area of the lens body.
[0022] Compared with the prior art, the ophthalmic lens and its manufacturing process provided by the present invention have the following advantages:
[0023] 1. This invention combines multiple microstructures into a scattering cluster and then uses the scattering cluster to fill the auxiliary region. On the one hand, the scattering cluster can enhance the scattering of incident light in other directions, reducing the resolution of the luminescent object in the angular direction; on the other hand, multiple microstructures arranged according to the spatial lattice configuration can ensure the uniformity of the entire scattering cluster.
[0024] 2. The present invention designs a specific crystal lattice configuration, which can be selected according to actual needs, such as square lattice, triangular lattice or graphene-like lattice, thereby improving the design flexibility, meeting a variety of application requirements, and making the present application more widely applicable.
[0025] 3. The present invention adopts a design form that combines integrity and randomness, which can achieve controllability and ease of processing, while retaining the randomness of the design, effectively avoiding the potential impact of periodic artifacts on optical performance.
[0026] 4. By adjusting the duty cycle of the microstructure, the light scattering performance can be further finely controlled. The combination of random offset and duty cycle optimization makes the design not only flexible, but also able to control the scattering directionality more efficiently. Attached Figure Description
[0027] Figure 1This is a schematic diagram of the structure of an ophthalmic lens in a specific embodiment of the present invention;
[0028] Figure 2 This is a schematic diagram of light scattering when incident on a microstructure.
[0029] Figure 3 A schematic diagram comparing the background field, total field, and scattered field with and without microstructure;
[0030] Figure 4 The scattering of light at different wavelengths and different microstructure depths, and their Fourier transforms;
[0031] Figure 5 This is a schematic diagram showing the transmittance at different locations on the measured sample.
[0032] In the figure: 10 - central region, 20 - auxiliary region, 30 - scattering cluster, 31 - microstructure. Detailed Implementation
[0033] To illustrate the technical solutions of the invention in more detail, specific embodiments are listed below to demonstrate the technical effects; it should be emphasized that these embodiments are used to illustrate the invention and not to limit the scope of the invention.
[0034] The ophthalmic lens provided by this invention, such as Figure 1 As shown, the device includes a lens body, which comprises a central region 10 and an auxiliary region 20 surrounding the central region 10. The auxiliary region 20 contains a plurality of scattering clusters 30 formed by translation according to a preset period. Each scattering cluster 30 is composed of multiple microstructures 31 arranged according to a spatial lattice configuration. This invention first combines multiple microstructures 31 into scattering clusters 30, and then uses multiple random scattering clusters 30 to fill the auxiliary region 20. On the one hand, the scattering clusters 30 enhance the scattering of incident light in other directions, reducing the angular resolution of the luminescent object; on the other hand, the multiple microstructures 31 arranged according to a spatial lattice configuration ensure the uniformity of the entire scattering cluster 30.
[0035] In some embodiments, the preset period a is 400μm±50μm to ensure that the density of each scattering cluster 30 is moderate, so as not to affect light transmission or scattering effect, thereby uniformly reducing the contrast of the auxiliary area 20 as a whole.
[0036] In some embodiments, the scattering cluster 30 can be constructed according to the preset period a using a random offset method. This ensures both the integrity and randomness of the scattering cluster 30. Since the lattice type leads to a specific diffraction spot distribution, this application effectively reduces the intensity of the diffraction spots by introducing randomness to avoid interference with system performance. By adjusting the duty cycle of the microstructure 31, fine control of light scattering performance can be further achieved; the combination of random offset and duty cycle optimization makes the design not only flexible but also allows for more efficient control of scattering directionality.
[0037] In some embodiments, the diameter d1 of the scattering cluster is less than or equal to 100 μm, which can scatter visible light without affecting the wearer's normal vision.
[0038] In some embodiments, the principal lattice of the space lattice configuration of the microstructure 31 may be a triangular lattice. Figure 1 Taking the scattering cluster 30 as an example, seven hexagonal patterns are generated at each main lattice position, one of which is the center point and the other six are surrounding points; the main lattice of the spatial lattice configuration of the microstructure 31 can also be a square lattice, such as a 3×3 square array pattern composed of nine points. In some embodiments, the number of microstructures 31 in each scattering cluster 30 is 7 to 9, with a moderate density, which improves the user experience.
[0039] In some embodiments, the diameter d2 of each microstructure 31 is 30 μm ± 1 μm, which improves the scattering effect of the lens and facilitates its fabrication. For scenarios where the size of a single microstructure 31 is small (e.g., on the order of micrometers), this design introduces multiple microstructures 31 to form a scattering cluster 30, creating a complex lattice structure. This enhances the scattering intensity of each scattering cluster 30 through multi-level scattering effects, thereby optimizing the overall scattering performance.
[0040] This invention achieves unique optical performance with high-efficiency scattering and reduced angular resolution by setting a specific lattice structure and introducing random design on this basis, combined with the complex structure of the scattering cluster 30 and duty cycle optimization. Its flexible design method and strong adaptability significantly improve the overall performance of the optical system while ensuring fabrication feasibility and meeting various practical application requirements.
[0041] This invention also provides a manufacturing process for ophthalmic lenses as described above, primarily using a laser etching machine. Before etching begins, the laser of the laser etching machine is preheated to stabilize its output laser power; a water cooler is turned on to prevent the laser from overheating and being damaged; and an industrial control computer and a galvanometer are connected. Then, the following etching steps begin:
[0042] Step 1: Place the lens body on the stage of the laser etching machine and fix it with a clamp to prevent it from moving during processing; move the laser lens and align the center of the laser lens with the center of the lens body, and mark it as the far point.
[0043] Step 2: Adjust the laser parameters, which include at least the laser wavelength, power, and the height and speed of the galvanometer. In this embodiment, the laser wavelength is set to 0.355 μm; the laser power is set to 5–10 watts; the galvanometer speed is set in conjunction with the laser power to jointly adjust the etching depth; the galvanometer height is adjusted according to the thickness of the eyeglasses to be processed, so that the processed surface is on the focal plane of the lens.
[0044] Step 3: Use a laser to etch the microstructure 31 onto the lens body. In this embodiment, step 3 specifically includes:
[0045] Step 31: Design the structural model of auxiliary region 20 and save it as dxf format, or other formats that the laser etching machine can recognize.
[0046] Step 32: Import the DXF format file into the laser etching machine to complete the graphic verification and confirmation.
[0047] Step 33: Perform pre-etching with low-power red light to ensure the accuracy of the etching position and range.
[0048] Step 34: Start etching. The laser etching machine processes the corresponding pattern in the auxiliary area 20 of the lens body based on the above parameters. After etching is completed, turn off the laser, the water chiller, and the industrial control computer.
[0049] The above-mentioned fabrication process fully considers the feasibility of actual processing technology. By adding random structures to specific lattices and introducing complex lattices, the design is ensured to meet both optical performance requirements and efficient processing, which improves the operability of mass production, helps to improve energy utilization, reduce energy waste, and reduce environmental pollution.
[0050] The technical effects of using the ophthalmic lenses proposed in this invention are described in detail below.
[0051] First, the light scattering effect of the microstructure 31 in this invention can be analyzed using scattering theory. For example... Figure 2 As shown, a plane wave E i =E0e i(ωt-kr) Incident to Figure 2 The structure shown here, represented by an electric field, has its scattered field analytically expanded into a multipole as follows:
[0052]
[0053] Where a n and b n is the scattering coefficient of the electric multipole and the magnetic multipole, while N and M are the corresponding vector spherical harmonic functions. Due to the presence of microstructure 31, the incident light is scattered in all directions, thereby weakening the directly transmitted light field.
[0054] As an example, this application etches a microstructure 31 with a diameter D = 30 μm and a depth h = 1 μm on a lens body with a refractive index of 1.6. Since the diameter D of the microstructure 31 is much larger than the wavelength of the incident wave and also much larger than the depth h, this scattering problem lies between macroscopic geometric optics and microscopic wave optics, requiring a large computational load for rigorous calculations. In actual fabrication, it is difficult to achieve uniformity and smoothness around the microstructure 31; therefore, the electromagnetic field can be approximated as being uniform along the tangential direction (φ direction), i.e., only the n = 0 term is considered. This is because higher-order modes in the azimuth direction are affected by the non-uniformity in that direction, ultimately exhibiting an average effect. However, scattering caused by the steps of the microstructure 31 cannot be ignored in the polar direction.
[0055] By comparing the light scattering phenomenon with and without microstructure 31 through simulation calculations, the effect of microstructure 31 on light scattering is quantitatively analyzed. A plane wave is incident on the system to study the scattering problem. Since the electromagnetic field is assumed to be uniform along the tangential direction, an axisymmetric model can be used, and only the region r≥0 needs to be considered, which allows for a rapid estimation of scattering with low computational cost.
[0056] like Figure 3 As shown, taking an incident wave with a wavelength of 0.7 μm as an example, the scattering characteristics of the system for light are studied. Figure 3 (a) and 3(b) respectively show the background field, the total field, and the scattered field obtained by subtracting the background field from the total field. For comparison, as shown... Figure 3 As shown in (c), the scattering field of a lens without microstructures is displayed. By comparing the scattering fields, it can be clearly seen that when light is incident on the lens provided in this application, the light field will scatter in all directions.
[0057] The following study investigates the light scattering problem when light of different wavelengths is incident on microstructures 31 at different depths.
[0058] like Figure 4 As shown, the scattering effect of incident light on 31 pairs of microstructures at different depths was simulated and calculated. To more clearly illustrate the scattering effect, only the scattering field inside the lens is presented. Figure 4In (a), the scattering fields for shallow groove depths of 0 μm, 1 μm, 2 μm, and 3 μm are given, respectively. The dashed line represents the interface between air and the lens, with air above the interface and the lens below. Compared to the absence of microstructure, the presence of microstructure 31 ensures that incident light can be scattered, indicating that the lens structure provided by this invention has good robustness and can effectively scatter incident light.
[0059] To further clarify the scattering phenomenon, this application performs a Fourier transform on the scattered field in the lens. It can be clearly seen that, in the absence of microstructure, the incident scattering mainly concentrates on the Fourier component f. r A value near 0 indicates that light is incident directly into the lens. When microstructure 31 is present, scattering broadens, meaning that light will be scattered in other directions after passing through microstructure 31.
[0060] Since lenses are primarily used in the visible light band, this invention also analyzes wavelength dependence. Figure 4 In (b) and 4(c), different wavelengths (green light and blue light) were selected to study their scattering effects. Similar to the wavelength of 0.7 μm (red light), the presence of microstructure 31 can effectively scatter the incident light.
[0061] To verify the effect of introducing microstructure 31 into the auxiliary region 20, transmittance measurements were performed at multiple test points in the central region 10 and the auxiliary region 20 surrounded by microstructure 31. (See attached figures.) Figure 5 (a); The specific test point distribution is as follows:
[0062] Three test points, c1, c2, and c3, were selected in the central region 10, which has no microstructure 31.
[0063] The auxiliary region 20 selects three test points e1, e2 and e3, and microstructures 31 are introduced in this region.
[0064] Figure 5 (b) The transmittance test results show that, within the visible light wavelength range, the transmittance of the central region 10 is about 20% higher than that of the auxiliary region 20. The reduced transmittance of the auxiliary region 20 indicates that the light is more diffused, thus reducing the brightness difference between the central region 10 and the surrounding auxiliary region 20, thereby achieving the goal of optimizing the overall contrast.
[0065] Therefore, it can be seen that, due to the flexibility of the design of lattice type and randomness, this application can adapt to different optical system requirements, especially in scenarios such as contrast reduction, uniform scattering and special optical effects, it shows significant technical advantages.
[0066] In summary, the ophthalmic lens and its manufacturing process provided by this invention include a lens body comprising a central region 10 and an auxiliary region 20 surrounding the central region 10. The auxiliary region 20 contains a plurality of scattering clusters 30 formed by translation according to a preset period. Each scattering cluster 30 is composed of multiple microstructures 31 arranged according to a spatial lattice configuration. This invention, by first combining multiple microstructures 31 into scattering clusters 30 and then filling the auxiliary region 20 with multiple random scattering clusters 30, can, on the one hand, enhance the scattering of incident light in other directions using the scattering clusters 30, reducing the angular resolution of the luminescent object; on the other hand, it can ensure the uniformity of the entire scattering cluster 30 by utilizing multiple microstructures 31 arranged according to a spatial lattice configuration.
[0067] Obviously, those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.
Claims
1. An ophthalmic lens, characterized in that, The lens body includes a central region and an auxiliary region surrounding the central region. Several scattering clusters are distributed within the auxiliary region and are formed by translation according to a preset period. Each scattering cluster is composed of multiple microstructures arranged according to a spatial lattice configuration.
2. The ophthalmic lens as described in claim 1, characterized in that, The preset period is 400μm±50μm.
3. The ophthalmic lens as described in claim 1 or 2, characterized in that, The scattering clusters are constructed according to the preset period by a random offset method.
4. The ophthalmic lens as described in claim 1, characterized in that, The diameter of the scattering cluster is less than or equal to 100 μm.
5. The ophthalmic lens as described in claim 1, characterized in that, The main lattice of the microstructure's spatial lattice configuration is a triangular lattice or a square lattice.
6. The ophthalmic lens as described in claim 1, characterized in that, The number of microstructures in each scattering cluster is 7 to 9.
7. The ophthalmic lens as described in claim 1, characterized in that, Each of the microstructures has a diameter of 30 μm ± 1 μm.
8. A manufacturing process for an ophthalmic lens as described in claim 1, characterized in that, Includes the following steps: Step 1: Place the lens body on the stage of the laser etching machine and fix it with a clamp; move the laser lens to align the center of the laser lens with the center of the lens body; Step 2: Adjust the laser parameters, which include at least the laser wavelength, power, and the height and speed of the galvanometer; Step 3: Use a laser to etch the microstructure onto the lens body.
9. The preparation process according to claim 8, characterized in that, In step 2, the wavelength of the laser is set to 0.355 μm; the power of the laser is set to 5 to 10 watts.
10. The preparation process according to claim 8, characterized in that, Step 3 includes: Step 31: Design the structural model of the auxiliary area and save it as a dxf file; Step 32: Import the DXF format file into the laser etching machine to complete the graphic verification and confirmation; Step 33: Complete the pre-etching with low-power red light; Step 34: Start etching. The laser etching machine processes the corresponding pattern in the auxiliary area of the lens body.