Photochromic optical path difference regulation structure lens

Abstract

The utility model provides a photochromic optical path difference regulation structure lens, which relates to the field of optical lenses, and comprises a lens piece, the lens piece is suitable for refraction correction, the lens piece comprises an optical path difference regulation area, and the optical path difference regulation area is suitable for generating various optical signals including defocus signals so as to prevent and control myopia; and the composite functional area is suitable for adjusting the color of the lens. According to the myopia prevention and control lens, color change of the myopia prevention and control lens is realized by arranging the photochromic composite functional region, and the refractive index change generated by photochromic is dynamically offset by the optical compensation region arranged in the composite functional region, so that interference of the refractive index change on optical signals such as defocus signals in the photochromic process is avoided; the stability of the myopia prevention and control effect is ensured; the optical path difference regulation and control area integrates various optical signals, provides additional prevention and control means for people who are not sensitive to single out-of-focus signals, and achieves a better myopia prevention and control effect.

Description

Technical Field

[0001] This utility model relates to optical lenses, specifically to a photochromic optical path difference control structure lens. Background Technology

[0002] Myopia control lenses are mostly developed based on retinal contrast signals and peripheral defocus theory. They achieve the goal of slowing down the progression of myopia by setting specific optical areas on the lens. In addition, to meet some of the needs of eyeglass wearers, there are also photochromic lenses. These lenses use photochromic materials to adjust the color depth of the lens when the light intensity changes (such as when the wearer moves from indoors to outdoors), providing the wearer with a better visual experience.

[0003] However, since photochromic materials mainly rely on reversible isomerization reactions under specific wavelengths of light to achieve color changes, the process of adjusting color generally has a significant impact on optical parameters such as the refractive index and Abbe number of the lens. This, in turn, affects optical signals such as defocus signals generated in the myopia control optical area of ​​the lens, thus affecting the myopia control effect. Furthermore, current myopia control lenses have relatively limited functions and cannot meet multiple visual needs simultaneously. For example, lenses using defocus theory only employ microlenses to generate defocus signals, and some people are not sensitive to the discrete defocus signals generated by microlenses, resulting in poor myopia control effects.

[0004] Based on this, this application proposes a photochromic optical path difference control structure lens in order to solve at least one of the aforementioned problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a photochromic optical path difference control structure lens, which solves the problems that current myopia control lenses cannot adapt to photochromism and have relatively simple optical signal control.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This application provides a photochromic optical path difference control structure lens, comprising: a lens element suitable for refractive correction, the lens element including:

[0008] The optical path difference control zone is suitable for generating various optical signals, including defocus signals, to control myopia.

[0009] The multi-functional area is used to adjust lens color.

[0010] The multifunctional area includes:

[0011] Photochromic zone, the photochromic zone is used to adjust the color of the lens;

[0012] The optical compensation region is suitable for dynamically complementing the refractive index change caused by photochromism in the photochromic region.

[0013] In a preferred embodiment, the optical compensation region is disposed on the outside of the photochromic area or co-molded therewith.

[0014] In a further preferred embodiment, the spatial distribution of microstructures in the optical compensation region and the optical path difference control region maintains a geometrical correspondence.

[0015] In one embodiment, the optical path difference control region includes:

[0016] Microlens region, which includes multiple microlenses, is suitable for generating defocused optical signals;

[0017] The annular lens region comprises multiple annular lenses.

[0018] In one embodiment, the photochromic region is composed of spiropyran-based organic molecules uniformly dispersed in a polyurethane acrylate matrix.

[0019] In a preferred embodiment, the optical compensation region is composed of a siloxane resin doped with nano-titanium dioxide particles.

[0020] In one embodiment, a central optical region without optical structures is provided at the center of the optical path difference control region.

[0021] In a preferred embodiment, the annular mirror is a continuous annular annular mirror.

[0022] In a further preferred embodiment, the microlenses are arranged in a circular array on the lens element, and the microlenses and the annular lens are arranged alternately in the direction from the center to the edge of the lens element.

[0023] In one embodiment, some microlenses have different defocusing amounts.

[0024] In a preferred embodiment, the defocusing amount of the microlens is set in a gradient.

[0025] This invention provides a photochromic optical path difference control structure lens. Compared with the prior art, it has the following advantages:

[0026] This application achieves photochromic control lenses by setting up a photochromic composite functional area. The optical compensation area set in the composite functional area dynamically cancels the refractive index change caused by photochromism, avoiding interference of optical signals such as defocus signals due to refractive index changes during photochromism, and ensuring the stability of myopia control effect. The optical path difference control area integrates multiple optical signals, including defocus signals, providing an additional control method for people who are not sensitive to a single defocus signal, and achieving a better myopia control effect. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A front view of a photochromic optical path difference control structure lens provided in an embodiment of this application.

[0029] Figure 2 for Figure 1 Sectional view at point BB.

[0030] Figure 3 for Figure 1 Enlarged view of section A.

[0031] Figure 4 for Figure 2 Enlarged view of section C.

[0032] Figure 5 Another cross-sectional view at BB provided for an embodiment of this application;

[0033] Figure 6 for Figure 4 Enlarged view of section D in the middle.

[0034] In the diagram: 1. Optical path difference control area; 2. Composite function area;

[0035] 11. Microlens region; 12. Ring-shaped lens region; 21. Photochromic region; 22. Optical compensation region;

[0036] 111. Microlens; 121. Circular lens. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] This application provides a photochromic optical path difference control structure lens, which solves the problems that current myopia control lenses cannot adapt to photochromism and have relatively simple control optical signals.

[0039] The outer side mentioned in the embodiments of this application refers to the side away from the fundus in the direction of the eye axis.

[0040] The technical solution in this application is to solve the aforementioned technical problems, and the overall approach is as follows:

[0041] Myopia control lenses utilize special optical designs to alter retinal growth signals and slow down axial elongation. Among related technologies, myopia control lenses are primarily developed based on DOT, DIMS, and DISC technologies. DOT lenses are developed based on the theory of retinal contrast signals; these lenses often employ scattering structures to adjust the contrast of light signals falling into the fundus of the eye, thus inhibiting axial elongation. DISC is a soft corneal contact technology, commonly used in contact lenses. DIMS is a myopia control lens based on peripheral defocus theory; these lenses use microlens structures to generate defocus optical signals in the fundus, thereby inhibiting axial elongation. However, photochromic lenses alter the lens's optical parameters (especially refractive index) during the color-changing process, affecting the effectiveness of the aforementioned myopia control technologies.

[0042] Furthermore, glasses using only DIMS technology typically contain only microlenses in their lenses, resulting in a relatively simple optical signal. Different people have different sensitivities to different optical signals; some people may be more sensitive to discrete defocus signals, while others may be more sensitive to continuous defocus signals. This makes the performance of conventional myopia control lenses less than ideal. Therefore, there is an urgent need to develop a new type of lens to meet the growing demand from the myopia control population.

[0043] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0044] Example 1:

[0045] See Figures 1-6 As shown in the embodiment of this application, a photochromic optical path difference control structure lens includes: a lens element suitable for refractive correction, the lens element including: an optical path difference control area 1, the optical path difference control area 1 being suitable for generating multiple optical signals, including defocus signals, for myopia control; a composite function area 2, the composite function area 2 being suitable for adjusting lens color; the composite function area 2 including: a photochromic area 21, the photochromic area 21 being suitable for adjusting lens color; and an optical compensation area 22, the optical compensation area 22 being suitable for dynamically complementing the refractive index change caused by photochromism in the photochromic area 21.

[0046] In this embodiment, it should be noted that the lens is suitable for refractive correction, that is, traditional myopia lenses correct the axial elongation and focal shift of the myopic wearer's eye; the optical path difference control area 1 generates a defocus signal for myopia control, wherein part of the defocus signal is generated by a microlens structure, which generates a positive focus optical signal on the wearer's retina, thereby stimulating fundus cells and inhibiting eyeball growth, which belongs to the prior art (DIMS).

[0047] Other optical signals can be used, such as setting a dot-like structure with a very small radius on the lens to scatter the light signal, thereby reducing the contrast of the light signal and suppressing myopia in the wearer (i.e., based on the DOT control theory); or a cylindrical structure can be set to provide refractive power opposite to the irregular curvature of the cornea on the astigmatic axis to compensate for the focusing difference of light in that direction, thereby refocusing the scattered light entering the eye onto the same focal point, thus regulating the wearer's astigmatism. These technologies are all existing technologies and can be found in existing eyeglass lenses. In this embodiment, the optical path difference control area 1 uses multiple optical signals, including a composite defocus signal, to provide an additional control method for people who are not sensitive to defocus signals, achieving a better myopia control effect.

[0048] Furthermore, the photochromic region 21 in the composite functional region 2 is constructed by uniformly dispersing photochromic compounds in a matrix. These photochromic compounds can be spirooxazine, naphthylpyran, spiropyran, silver halide microcrystals, etc.; the matrix material can be polyurethane acrylate, thermoplastic plastics (such as PC), thermosetting resins (such as CR-39), photocurable resins, etc. The color-changing principle utilizes the reversible molecular structure change of the photochromic compound molecules under specific wavelength light excitation, thereby altering its absorption spectrum and macroscopically manifesting as a color change. This provides the wearer with adaptive color changes when ambient light intensity changes, eliminating the need to switch glasses (e.g., when moving from indoors to outdoors or when driving), thus improving the wearer's comfort.

[0049] The optical compensation region 22 is composed of a matrix with a specific thermo-optic coefficient. The thermo-optic coefficient refers to the change in refractive index of the material when the lens absorbs light of a specific wavelength (such as ultraviolet light) and the temperature changes. By selecting a material with a refractive index change opposite to that of the photochromic region 21, the refractive index change caused by the color change of the photochromic material is dynamically offset, maintaining the stability of the optical path difference control. Generally speaking, the refractive index of the photochromic compound in the photochromic region 21 will increase after the color change. Therefore, the matrix material in the optical compensation region 22 can be made of silicone resin, epoxy resin, polymethyl methacrylate, etc. These materials have a high thermo-optic coefficient, and their refractive index change caused by temperature change is relatively high. When the color change of the photochromic region 21 causes the temperature to rise and the refractive index to rise, these materials reduce the refractive index with the temperature increase, thereby compensating for the increase in refractive index caused by the photochromic compound.

[0050] In a preferred embodiment, nanoparticles are uniformly doped within the optical compensation region 22, which is suitable for improving the rate of refractive index compensation.

[0051] In this embodiment, it should be noted that the nanoparticles can be titanium dioxide, tungsten oxide, zinc oxide, etc. These materials are uniformly doped into the matrix of the optical compensation region 22. They generally have strong ultraviolet absorption efficiency and thermal conductivity, and can absorb light transmitted through the lens, especially ultraviolet light, to raise the temperature, thereby improving the heat transfer efficiency of the optical compensation region 22, which is beneficial to improving the refractive index compensation rate. In addition, nanoparticles with strong ultraviolet absorption efficiency can slow down the photoaging of the lens and improve the weather resistance of the lens.

[0052] Example 2:

[0053] This application provides a photochromic optical path difference control lens, including all the contents of Embodiment 1 and its preferred embodiments. In addition, the optical compensation area 22 is disposed outside the photochromic area 21.

[0054] In this embodiment, it should be noted that the optical compensation region 22 is disposed outside the photochromic region 21, and its purpose is to ensure that the refractive index change compensated by the optical compensation region 22 can completely cover the refractive index change caused by the color change of the photochromic region 21.

[0055] In a preferred embodiment, the optical compensation region 22 and the photochromic region 21 are co-formed.

[0056] It should be noted that, unlike the aforementioned embodiments, the co-molding of the optical compensation region 22 and the photochromic region 21 can ensure the heat transfer efficiency of the optical compensation region 22 and the photochromic region 21 on the lens, so that the refractive index compensation of the optical compensation region 22 has a faster response speed, meeting the needs of the wearer.

[0057] In a further preferred embodiment, the spatial distribution of the microstructures in the optical compensation region 22 and the optical path difference control region 1 maintains a geometrical correspondence.

[0058] In this embodiment, it should be noted that the spatial distribution of the microstructures in the optical compensation region 22 and the optical path difference control region 1 maintains a geometrical correspondence. The purpose is to ensure that the compensation effect of the optical compensation region 22 is applied to each microstructure in the optical path difference control region 1, so as to ensure that the optical signals, including the defocus signal, are not affected by the refractive index change caused by the color change of the compound in the photochromic region 21.

[0059] Example 3:

[0060] This application provides a photochromic optical path difference control structure lens, including all contents of Embodiments 1 to 2 and their preferred embodiments. In addition, the optical path difference control area 1 includes: a microlens area 11, which includes a plurality of microlenses 111, suitable for generating defocus optical signals; and a ring lens area 12, which includes a plurality of ring lenses 121.

[0061] In this embodiment, it should be noted that the microlens 111 is used to generate defocus optical signals to stimulate fundus cells and inhibit axial elongation. Multiple microlenses 111 generate a large number of discrete defocus signals to cover the main area of ​​the fundus. The optical defocus signals generated by multiple ring lenses 121 are adapted to the length and curvature of the ring lenses 121 to form a ring-shaped defocus area in the eye, which is suitable for people who are not sensitive to the discrete defocus signals generated by the microlens structure. This provides an additional control method for people who are not sensitive to a single defocus signal, and achieves a better myopia control effect.

[0062] Example 4:

[0063] The present application provides a photochromic optical path difference control structure lens, including all contents of Examples 1 to 3 and their preferred embodiments. In addition, the photochromic region 21 is composed of spiropyran organic molecules uniformly dispersed in a polyurethane acrylate matrix.

[0064] It should be noted that spiropyran organic molecules, as the main color-changing compounds in photochromic region 21, can have various substituents introduced at different positions through chemical synthesis, thereby partially adjusting the range of refractive index changes and better adapting to the compensation modulation of the optical compensation layer. The introduction of substituents into spiropyran organic molecules can be found in semiconductor lasers, chemical sensors, photochromic lenses, and other technologies, and the principle will not be elaborated here. Polyurethane acrylate is also a common material in photochromic lenses. The main purpose of choosing this type of material is that it can be dissolved in the monomer along with the photochromic dye, and formed through processes such as injection, casting, and coating. It can also provide molecular ring mirrors for the color-changing reaction of photochromic molecules, and the specific principle will not be elaborated here.

[0065] In a preferred embodiment, the optical compensation region 22 is composed of a siloxane resin doped with nano-titanium dioxide particles.

[0066] It should be noted that siloxane resin itself has a large thermo-optic coefficient, that is, the refractive index of the resin decreases significantly with increasing temperature. On the other hand, nano-titanium dioxide particles have a high refractive index, which can ensure the rate of refractive index compensation. By precisely controlling the doping amount of nano-titanium dioxide particles, the overall thermo-optic coefficient of the optical compensation region 22 can be finely controlled so that it can be matched with the refractive index change range of the photochromic layer.

[0067] Furthermore, siloxane resins exhibit strong resistance to high and low temperatures, UV aging, and chemical stability. Their volume shrinkage during curing (typically thermosetting or UV curing) is relatively low, which helps reduce internal stress and lens deformation, maintaining the optical precision of the lens surface design (especially the shape of the microlens structure). Nano-titanium dioxide itself is also an extremely stable inorganic material. The combination of these two materials allows the compensation layer to withstand long-term outdoor temperature cycling and UV exposure, resulting in a long lifespan and slow performance degradation.

[0068] Furthermore, by appropriately modifying the surface of nano-titanium dioxide particles with silane coupling agents, they can form strong chemical bonds with the siloxane resin matrix, thereby achieving highly uniform and stable dispersion, preventing particle agglomeration and sedimentation, and ensuring optical uniformity and long-term stability.

[0069] When the photochromic region 21 and the optical compensation region 22 are blended, two spray guns can be used simultaneously on the lens substrate to spray a polyurethane acrylate matrix containing spiropyran organic molecules and a siloxane resin to achieve blending.

[0070] Example 5:

[0071] This application provides a photochromic optical path difference control structure lens, including all contents of Embodiments 1 to 4 and their preferred embodiments. In addition, the optical path difference control area 1 has a central optical area without optical structure.

[0072] See Figures 1-6 As shown, it should be noted that the central optical zone corresponds to the wearer's macula. No additional optical instruments or microstructures are placed in this area to ensure that the wearer's main field of vision is clear.

[0073] In a preferred embodiment, the annular mirror 121 is a continuous annular annular mirror.

[0074] In this embodiment, it should be noted that some people may be sensitive to the optical signals generated by the continuous and ring-shaped ring lens 121. The continuous ring-shaped ring lens 121 structure can generate continuous and uninterrupted light signals to reduce visual fatigue of the wearer.

[0075] In a further preferred embodiment, the microlenses 111 are arranged in a circular array on the lens element, and the microlenses 111 and the annular mirror 121 are arranged alternately in the direction from the center to the edge of the lens element.

[0076] In this embodiment, it should be noted that, see Figures 1-6 As shown, the circular microlens array 111 ensures a uniform distribution of scattered signals in all directions, avoiding uneven control effects due to directional differences. The alternating arrangement of microlenses 111 and annular mirrors 121 makes the visual transition from the center to the edge more natural and continuous, reducing discomfort caused by abrupt changes in optical structure (such as when the line of sight shifts directly from the microlens area 11 to the annular mirror area 12).

[0077] Example 6:

[0078] The present application provides a photochromic optical path difference control structure lens, including all contents of Embodiments 1 to 5 and their preferred embodiments. In addition, some microlenses 111 have different defocus amounts.

[0079] In this embodiment, it should be noted that some microlenses 111 have different defocus amounts, meaning that the defocus amount of microlenses 111 can be set independently, thereby achieving more gradient and more directional differences in defocus signals. For example, the defocus amount can be set from the center of the lens to the periphery, or multiple sets of microlenses 111 with different defocus amount signals can be set for wearers to conduct wearing tests, so as to find the setting range most suitable for the protection needs of some wearers and improve the universality of this device.

[0080] In a preferred embodiment, the defocusing amount of the microlens 111 is set in a gradient.

[0081] In this embodiment, it should be noted that the defocus amount of the microlens 111 can gradually increase from the center of the field of vision to the outer edge of the field of vision, forming a defocus gradient from the center to the periphery. This design can simulate the refractive state of the human eye when it sees objects naturally, so that the defocus amount in the peripheral area increases with distance, gradually enhancing the control effect and alleviating the visual interference caused by the sudden change in defocus amount when the wearer's vision moves from the central optical area to the optical path difference control area 1.

[0082] In summary, compared with existing technologies, it has the following beneficial effects:

[0083] 1. This application achieves the photochromic effect of myopia control lenses by setting up a photochromic composite functional area. The optical compensation area set in the composite functional area dynamically cancels the refractive index change caused by photochromism, avoiding the interference of optical signals such as defocus signals due to the refractive index change during the photochromic process, and ensuring the stability of the myopia control effect.

[0084] 2. By setting up an optical path difference control zone, this application integrates multiple optical signals, including defocus signals, providing an additional prevention and control method for people who are not sensitive to a single defocus signal, thus achieving a better myopia prevention and control effect.

[0085] 3. By setting the materials (siloxane resin, modified nano-titanium dioxide particles) of the photochromic zone and the optical compensation zone in the composite functional area, this application enables the lens to maintain a stable photochromic response, maintain an accurate defocus signal, and extend the effective service life and optical performance stability of the lens.

[0086] 4. This application integrates multiple optical signals (scattering structure and cylindrical lens) within the optical path difference control zone to enable the lens to meet the prevention and control needs of myopia patients and to adapt to vision correction for myopia combined with astigmatism.

[0087] 5. This application allows for the independent setting and gradient adjustment of the defocus amount of the microlens, enabling the customization of optical parameters based on the axial length and defocus sensitivity of different wearers. This further adapts to the prevention and control needs of specific groups and broadens the application range of the lenses.

[0088] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0089] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A photochromic optical path difference control structure lens, characterized in that, include: A lens element, the lens element being adapted for refractive correction, the lens element comprising: Optical path difference control area (1), wherein the optical path difference control area (1) is suitable for generating a variety of optical signals, including defocus signals, for myopia control; Composite functional area (2), wherein the composite functional area (2) is suitable for adjusting lens color; The composite functional area (2) includes: Photochromic region (21), wherein the photochromic region (21) is suitable for adjusting the color of the lens; Optical compensation region (22) is adapted to dynamically complement the refractive index change caused by photochromism in the photochromic region (21).

2. The photochromic optical path difference control structure lens as described in claim 1, characterized in that, The optical compensation region (22) is uniformly doped with nanoparticles, which is suitable for improving the rate of refractive index compensation.

3. The photochromic optical path difference control structure lens as described in claim 1, characterized in that, The optical path difference control region (1) includes: Microlens region (11), the microlens region (11) includes a plurality of microlenses (111) suitable for generating defocused optical signals; The annular mirror region (12) includes a plurality of annular mirrors (121).

4. The photochromic optical path difference control structure lens as described in claim 1, characterized in that, The photochromic region (21) is composed of spiropyran organic molecules uniformly dispersed in a polyurethane acrylate matrix.

5. The photochromic optical path difference control structure lens as described in claim 2, characterized in that, The optical compensation region (22) is composed of a siloxane resin doped with nano-titanium dioxide particles.

6. The photochromic optical path difference control structure lens as described in claim 1, characterized in that, The optical path difference control area (1) has a central optical area without optical structure.

7. The photochromic optical path difference control structure lens as described in claim 3, characterized in that, The annular mirror (121) is a continuous annular annular mirror.

8. A photochromic optical path difference control structure lens as described in claim 7, characterized in that, The microlenses (111) are arranged in a circular array on the lens element, and the microlenses (111) and the annular lens (121) are arranged alternately in the direction from the center to the edge of the lens element.

9. A photochromic optical path difference control structure lens as described in claim 3, characterized in that, Some of the microlenses (111) have different defocusing amounts.

10. A photochromic optical path difference control structure lens as described in claim 3, characterized in that, The defocusing amount of the microlens (111) is set in a gradient.

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