Myopia prevention and control lens and glasses

Abstract

The myopia prevention and control lens comprises a substrate and a diffractive optical structure, the substrate comprises a correction area and a prevention and control area, the correction area has correction diopter, the prevention and control area is located on the periphery of the correction area, and the diffractive optical structure is located in the prevention and control area. Comprising a plurality of diffraction rings with the correction area as the center, and the diffraction rings are used for controlling phase distribution generated when light signals pass through the prevention and control area, so that after the light signals pass through the diffraction optical structure and the prevention and control area, the difference of imaging signals generated in front of and behind peripheral retinas is reduced, and myopia deepening is delayed.

Description

Technical Field

[0001] The present application relates to the field of ophthalmic lenses, and in particular to myopia prevention and control lenses and glasses. Background Art

[0002] The mechanism of eyeball growth is complex, with many possible influencing factors. Currently, a widely accepted theory based on visual feedback in the ophthalmology community is the peripheral retinal hyperopic defocus theory, which states that when wearing myopia correction lenses to correct the vision on the visual axis of the human eye, the peripheral retina is in a hyperopic defocus state, and this signal will promote the continued growth of the eye axis. Therefore, intervening in the peripheral retinal visual imaging signal of the human eye to cause peripheral retinal myopic defocus has become the main means of myopia prevention and control currently popular in the market.

[0003] However, long-term use has shown that the prevention and control effects of defocus-based myopia prevention and control glasses are not stable, and myopia will still worsen after users wear them for a long time. Utility Model Content

[0004] The present application provides a myopia prevention and control lens and glasses, the purpose of which is to slow down the progression of myopia.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A myopia prevention and control lens comprises a substrate and a diffractive optical structure, wherein the substrate comprises a correction area and a prevention and control area, the correction area having a corrective refractive power, the prevention and control area being located at the periphery of the correction area, the diffractive optical structure being located at the prevention and control area, and comprising a plurality of diffraction rings centered on the correction area, the diffraction rings being used to control the phase distribution generated by a light signal passing through the prevention and control area, so that after the light signal passes through the diffractive optical structure and the prevention and control area, the difference in imaging signals generated in front of and behind the peripheral retina is reduced, thereby delaying the progression of myopia.

[0007] Optionally, size parameters of each of the diffraction rings in a direction from the center of the lens to the periphery of the lens are in a decreasing pattern, and the size parameters include the ring width of the diffraction ring.

[0008] Optionally, the correction area is also provided with a diffractive optical structure to produce the corrective refractive power, and the diffractive optical structure includes a plurality of diffraction rings centered on the center point of the correction area.

[0009] Optionally, size parameters of each of the diffraction rings in a direction from a center point of the correction area to the periphery of the lens are in a decreasing pattern, and the size parameters include the ring width of the diffraction ring.

[0010] Optionally, the minimum ring width of the diffraction ring can reach 0.01 um.

[0011] Optionally, the phase function of the diffractive optical structure includes a quadratic phase coefficient A1, a quartic phase coefficient A2 and a sextic phase coefficient A3, and |A3|>|A2|>|A1|.

[0012] Optionally, the shape of the control area is a plane, a spherical surface or an aspherical surface.

[0013] Optionally, the diffraction ring includes a plurality of steps, the distances between the steps are the same, and the heights of the steps are the same.

[0014] Optionally, the diffraction order of the diffraction optical structure is first order.

[0015] A pair of myopia prevention and control glasses, comprising the myopia prevention and control lenses shown above.

[0016] The technical solution provided in the present application is a myopia prevention and control lens including a substrate and a diffractive optical structure. The substrate includes a correction area and a prevention and control area. The correction area has a corrective refractive power. The prevention and control area is located at the periphery of the correction area. The diffractive optical structure is located in the prevention and control area, including multiple diffraction rings centered on the correction area. The diffraction rings are used to control the phase distribution generated by the light signal passing through the prevention and control area, so that after the light signal passes through the diffractive optical structure and the prevention and control area, the difference in imaging signals generated in front of and behind the peripheral retina is reduced, so as to interfere with the growth signal of the human eye axis and achieve better myopia prevention and control effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A front schematic diagram of a myopia prevention and control lens provided in an embodiment of the present application;

[0019] Figure 2 A front view schematic diagram of another myopia prevention and control lens provided in an embodiment of the present application;

[0020] Figure 3 A side schematic diagram of a myopia prevention and control lens provided in an embodiment of the present application;

[0021] Figure 4 A front schematic diagram of a pair of myopia prevention and control glasses provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of a step provided in an embodiment of the present application;

[0023] Figure 6 A schematic diagram of ray tracing provided in an embodiment of the present application;

[0024] Figure 7 A schematic diagram of an imaging spot provided in an embodiment of the present application;

[0025] Figure 8 A schematic diagram of another imaging spot provided in an embodiment of the present application;

[0026] Fig. 9 A schematic diagram of another imaging spot provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] In this application, relational terms such as and, etc. are used only to distinguish one entity or operation from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. The terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such articles or devices. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the article or device including the elements.

[0029] Embodiment 1

[0030] like Figure 1 , which is a front schematic diagram of a myopia prevention and control lens provided in an embodiment of the present application, including the structure shown below.

[0031] The myopia prevention and control lens includes a substrate 100 and a diffractive optical structure 200. The substrate includes a correction area 101 and a prevention and control area 102. The correction area 101 is used to correct vision and has a corrective refractive power. The prevention and control area 102 is located outside the correction area 101 and is used to prevent and control myopia.

[0032] It should be emphasized that the diffractive optical structure 200 refers to an optical element with a stepped diffractive structure on the surface, thereby converting a fixed spherical wave into a relatively controllable wavefront complex amplitude to achieve the field intensity distribution required by the design. In addition, the diffractive optical structure 200 can generate various phase distributions to achieve the distribution of light spots on the retinal image plane.

[0033] In some examples, the material of the substrate 100 includes, but is not limited to, resin, glass, hydrogel, silicone hydrogel, and the like.

[0034] In some examples, the substrate 100 is a smoothly connected lens surface, and the surface shape of the substrate 100 can be designed to be circular, rectangular, elliptical, and irregular (eg, heart-shaped, hexagonal).

[0035] In some examples, the corrective diopter of the correction area 101 matches the degree of correction required for myopia. In a possible implementation, the corrective diopter of the correction area 101 can be a constant value or a non-constant value. For setting the corrective diopter to a non-constant value, the corrective diopter of the correction area 101 can be set to fluctuate.

[0036] It should be noted that the correction area 101 may be located at the center of the substrate 100 , and the prevention and control area 102 is located at the periphery of the correction area 101 .

[0037] In some examples, the control area 102 may be provided with an additional diopter, or the diopter may be set to 0.

[0038] In some examples, the area occupied by the control area 102 in the substrate 100 may be greater than or equal to the area occupied by the correction area 101 in the substrate 100 .

[0039] Optionally, the shape of the control area 102 can be a plane, a spherical surface, or an aspherical surface. Generally speaking, if the control area 102 is designed as an aspherical surface, the light deflection can be more complex, thereby bringing better imaging quality. If the control area 102 is designed as a spherical surface, the complexity of lens processing can be reduced.

[0040] exist Figure 1 In the structure shown, the diffraction optical structure 200 is arranged in the control area 102, including a plurality of diffraction rings 201 centered on the correction area 101, and the diffraction rings 201 are used to control the phase distribution generated by the light signal passing through the control area 102.

[0041] In some examples, a diffraction optical structure 200 is also designed on the correction area 101 to generate a refractive power for correction, and the diffraction optical structure 200 includes a plurality of diffraction rings 201 centered on the center point of the correction area 101 (i.e., the optical center point). At this time, the myopia prevention and control lens composed of the correction area 101 and the prevention and control area 102 can be optically designed as an integrated whole.

[0042] In some examples, the shape of the diffraction ring 201 includes but is not limited to a circular ring, an elliptical ring, a polygonal ring, etc.

[0043] It should be noted that the major radius of each diffraction ring 201 is different, and the minor radius of each diffraction ring 201 is also different. It can be understood that each diffraction ring 201 takes the center point (i.e., the optical center point) of the correction area 101 as the center, and the minor radius of each diffraction ring 201 along the direction from the center of the lens to the periphery of the lens is increasing, and the major radius of each diffraction ring 201 along the direction from the center of the lens to the periphery of the lens is also increasing.

[0044] Optionally, the size parameters of each diffraction ring 201 along the direction from the center of the lens to the periphery of the lens are in a decreasing pattern, and the size parameters include the ring width of the diffraction ring 201. The so-called ring width can be determined based on the difference between the large radius and the small radius.

[0045] Optionally, the minimum value of the width of the outermost ring among the multiple diffraction rings 201 can reach 0.01 um.

[0046] In some examples, the calculation process of the ring width of the diffraction ring is shown in formula (1).

[0047] Δr k =r k -r k-1 (1)

[0048] In formula (1), Δr k represents the width of the kth diffraction ring, r k represents the radial distance of the kth diffraction ring, r k-1 represents the radial distance of the k-1th diffraction ring, where the phase formula of the diffraction structure is φ(r)=2πK, K represents the total number of all diffraction rings, and r max Represents the radial distance of the outermost diffraction ring.

[0049] It should be noted that the diffraction efficiency of the diffraction ring 201 is affected by the actual processing accuracy and cannot reach 100%. In order to improve the diffraction efficiency, the diffraction ring 201 can use a step structure design.

[0050] Optionally, the diffraction ring 201 includes a plurality of steps, the distances between the steps are the same, and the heights of the steps are the same.

[0051] Preferably, the diffraction ring 201 includes 8 steps, so that the diffraction ring 201 can take into account both processing difficulty and diffraction efficiency.

[0052] In some examples, such as Figure 5As shown, the diffraction ring 201 includes 8 steps, and the phase of each step is set to 2π / 8.

[0053] In some examples, the calculation process of the diffraction efficiency of the diffraction ring 201 is shown in formula (2).

[0054]

[0055] In formula (2), η represents the diffraction efficiency, L represents the number of steps included in the diffraction ring 201, m represents the diffraction order, m=1+αL, and α is a preset integer.

[0056] Optionally, the diffraction order of the diffraction optical structure can be set to first order, with the highest diffraction efficiency.

[0057] In some examples, the step height is calculated as shown in formula (3).

[0058] h=λ / (L*(n1-n2)) (3)

[0059] In formula (3), h represents the height of the step, λ represents the preset wavelength, n1 represents the refractive index of the lens material, and n2 represents the refractive index of air.

[0060] Optionally, the total number of diffraction rings 201 included in the diffractive optical structure 200 is greater than 20.

[0061] Optionally, the phase function (length unit) of the diffractive optical structure 200 includes three phase coefficients, and the phase function is shown in formula (4).

[0062]

[0063] In formula (4), r is the radial distance of the diffraction ring, A1 is the second-order phase coefficient, A2 is the fourth-order phase coefficient, and A3 is the sixth-order phase coefficient. Preferably, |A3|>|A2|>|A1|. Generally speaking, the values ​​of the phase coefficients A2 and A3 have a greater influence on the light distribution in the peripheral area of ​​the retina.

[0064] exist Figure 1 In the structure shown, the phase distribution generated by the diffractive optical structure 200 and the prevention and control area 102 reduces the difference in imaging signals generated in front of and behind the peripheral retina after the light signal passes through the diffractive optical structure 200 and the prevention and control area 102, thereby delaying the progression of myopia.

[0065] It should be noted that the phase distribution generated by the diffractive optical structure 200 and the control area 102 is as follows: Figure 6As shown, by changing the path of ray tracing, the light received by the peripheral retina is converged unevenly, the imaging signal is disordered, and a uniform imaging spot is produced in front of and behind the retina, avoiding excessive imaging differences in front of and behind the retina, thereby improving the prevention and control of myopia.

[0066] The structure shown in the first embodiment above can utilize the diffraction effect of the diffraction optical structure. By adjusting its phase coefficient to design the diffraction element, it can achieve uniform distribution of the imaging spot in front and behind the retina, reduce the difference in imaging signals generated in front and behind the peripheral retina, and effectively interfere with the growth of the eye axis, thereby playing a role in slowing down the progression of myopia.

[0067] Embodiment 2

[0068] like Figure 2 , which is a front schematic diagram of another myopia prevention and control lens provided in an embodiment of the present application. The myopia prevention and control lens is a contact lens, and includes the structure shown below.

[0069] The myopia prevention and control lens includes a substrate 100 and a diffractive optical structure 200, the substrate includes a correction area 101 and a prevention and control area 102, the correction area 101 is used to correct vision, the prevention and control area 102 is located at the periphery of the correction area 101, and the prevention and control area 102 is set to a plane shape, and the refractive power is set to 0.

[0070] exist Figure 2 In the structure shown, the diffraction optical structure 200 is located on the prevention and control area 102, and includes 159 diffraction rings 201 centered on the correction area 101.

[0071] exist Figure 2 In the structure shown, the phase coefficients of the diffractive optical structure 200 include A1, A2 and A3, wherein A1 is -87, A2 is 496, and A3 is 1998.

[0072] In some examples, the phase coefficient of the diffractive optical structure 200 can be designed based on ZEMAX software, which is conventional software for existing lens design.

[0073] exist Figure 2 In the structure shown, in each diffraction ring 201 shown in the diffraction optical structure 200, the ring width decreases in the direction from the center of the lens to the periphery of the lens, and the outermost ring width is 0.004 mm.

[0074] It should be noted that the phase distribution generated by the diffractive optical structure 200 reduces the difference in imaging signals generated in front of and behind the peripheral retina after the light signal passes through the diffractive optical structure 200 and the control area 102, thereby delaying the progression of myopia.

[0075] In some examples, the light signal passes through the myopia prevention lens and forms an imaging spot on the retina, such as Figure 7 As shown, it is obvious that the difference in the area of ​​the imaging spot between 3D in front of the retina and 3D behind the retina is small, and the difference in the area of ​​the imaging spot between 1.5D in front of the retina and 1.5D behind the retina is small. In addition, when the field of view angle is set to 20°, the light signal passes through the myopia prevention and control lens, and the size of the first spot formed at 1.5D in front of the retina is 31.381μm, and the size of the second spot formed at 1.5D behind the retina is 31.177μm. The difference between the two spots meets the requirements.

[0076] The structure shown in the above-mentioned second embodiment can utilize the combination of the substrate and the diffractive optical structure to reduce the difference in imaging signals generated in front of and behind the peripheral retina, effectively interfere with the growth of the eye axis, and thus play a role in slowing down the progression of myopia.

[0077] Embodiment 3

[0078] like Figure 3 , which is a side schematic diagram of a myopia prevention and control lens provided in an embodiment of the present application. The myopia prevention and control lens is a contact lens, and includes the structure shown below.

[0079] The myopia prevention and control lens includes a substrate 100 and a diffractive optical structure 200, the substrate includes a correction area 101 and a prevention and control area 102, the correction area 101 is used to correct vision, the prevention and control area 102 is located outside the correction area 101, and the surface shape and refractive power of the prevention and control area 102 are consistent with the surface shape and refractive power of the correction area 101, such as a spherical surface.

[0080] exist Figure 3 In the structure shown, the diffraction optical structure 200 is distributed in the correction area 101 and the prevention and control area 102, including 449 diffraction rings 201 centered on the center point of the correction area 101.

[0081] exist Figure 3 In the structure shown, the phase coefficients of the diffractive optical structure 200 include A1, A2 and A3, wherein A1 is 0, A2 is 1200, and A3 is -4000.

[0082] exist Figure 3 In the structure shown, in each diffraction ring 201 shown in the diffraction optical structure 200, the ring width decreases in the direction from the center point of the correction area 101 to the periphery of the lens, and the outermost ring width is 0.01 um.

[0083] It should be noted that the phase distribution generated by the diffractive optical structure 200 and the prevention and control area 102 reduces the difference in imaging signals generated in front of and behind the peripheral retina after the light signal passes through the diffractive optical structure 200 and the prevention and control area 102, thereby delaying the progression of myopia.

[0084] In some examples, the light signal passes through the myopia prevention lens and forms an imaging spot on the retina, such as Figure 8 As shown, it is obvious that the difference in the area of ​​the imaging spot between the 3D in front of the retina and the 3D behind the retina is small, and the difference in the area of ​​the imaging spot between the 1.5D in front of the retina and the 1.5D behind the retina is small. In addition, when the field of view angle is set to 20°, the light signal passes through the myopia prevention and control lens, and the size of the third spot formed at the 3D in front of the retina is 174.298μm, and the size of the fourth spot formed at the 3D behind the retina is 217.693μm. The difference between the third spot and the fourth spot meets the requirements.

[0085] The structure shown in the third embodiment above can utilize the combination of the substrate and the diffractive optical structure to scatter the light and finally present it on the retina, thereby achieving uniform light spots in front and behind the peripheral retina and delaying myopia.

[0086] Embodiment 4

[0087] like Figure 4 As shown, it is a front schematic diagram of a pair of myopia prevention and control glasses provided in an embodiment of the present application. The glasses are frame glasses and include the structure shown below.

[0088] The frame glasses include a myopia prevention and control lens 401 and a frame 402. The myopia prevention and control lens 401 includes a substrate 100 and a diffractive optical structure 200. The substrate includes a correction area 101 and a prevention and control area 102. The correction area is used to correct vision 101. The prevention and control area 102 is located outside the correction area 101. The surface shape and refractive power of the prevention and control area 102 are consistent with the surface shape and refractive power of the correction area 101, such as an aspherical surface.

[0089] exist Figure 4 In the structure shown, the diffraction optical structure 200 is arranged on the prevention and control area 102, including 1608 diffraction rings 201 centered on the correction area 101.

[0090] exist Figure 4 In the structure shown, the phase coefficients of the diffractive optical structure 200 include A1, A2 and A3, wherein A1 is 10, A2 is 100, and A3 is 10000.

[0091] exist Figure 4In the structure shown, in each diffraction ring 201 shown in the diffraction optical structure 200, the ring width decreases in the direction from the center of the lens to the periphery of the lens, and the outermost ring width is 0.0036 mm.

[0092] It should be noted that the phase distribution generated by the diffractive optical structure 200 and the prevention and control area 102 reduces the difference in imaging signals generated in front of and behind the peripheral retina after the light signal passes through the diffractive optical structure 200 and the prevention and control area 102, thereby delaying the progression of myopia.

[0093] In some examples, the light signal passes through the myopia prevention lens 401 and forms an imaging spot on the retina, such as Fig. 9 As shown, it is obvious that the difference in the area of ​​the imaging spot between 3D in front of the retina and 3D behind the retina is small, the difference in the area of ​​the imaging spot between 1.5D in front of the retina and 1.5D behind the retina is small, and the overall imaging spot is small. In addition, when the field of view angle is set to 20°, the light signal passes through the myopia prevention and control lens 401, and the size of the fifth spot formed at 1.5D in front of the retina is 37.466μm, and the size of the sixth spot formed at 1.5D behind the retina is 31.2μm. The difference between the fifth spot and the sixth spot meets the requirements.

[0094] The structure shown in the fourth embodiment above can utilize the combination of the substrate and the diffractive optical structure to reduce the difference in imaging signals generated in front of and behind the peripheral retina, effectively interfere with the growth of the eye axis, and thus play a role in slowing down the progression of myopia.

[0095] Although the subject matter has been described using language specific to structural features, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features described above. Rather, the specific features described above are merely example forms of implementing the claims.

[0096] Although several specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present application. Certain features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination.

[0097] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

Claims

1. A myopia prevention and control lens, comprising a substrate and a diffractive optical structure, wherein the substrate comprises a correction area and a prevention and control area, the correction area has a correction diopter, and the prevention and control area is located at the periphery of the correction area, characterized in that: The diffraction optical structure is located in the prevention and control area, and includes a plurality of diffraction rings centered on the correction area. The diffraction rings are used to control the phase distribution generated by the light signal passing through the prevention and control area, so that after the light signal passes through the diffraction optical structure and the prevention and control area, the difference in imaging signals generated in front of and behind the peripheral retina is reduced, thereby delaying the progression of myopia.

2. The myopia prevention and control lens according to claim 1, characterized in that: The size parameters of each of the diffraction rings along the direction from the center of the lens to the periphery of the lens are in a decreasing pattern, and the size parameters include the ring width of the diffraction ring.

3. The myopia prevention and control lens according to claim 1, characterized in that: The correction area is also provided with a diffractive optical structure to generate the corrective refractive power, and the diffractive optical structure includes a plurality of diffraction rings centered on the center point of the correction area.

4. The myopia prevention and control lens according to claim 3, characterized in that: The size parameters of each of the diffraction rings along the direction from the center point of the correction area to the periphery of the lens are in a decreasing pattern, and the size parameters include the ring width of the diffraction ring.

5. The myopia prevention and control lens according to claim 2 or 4, characterized in that: The minimum ring width of the diffraction ring can reach 0.01um.

6. The myopia prevention and control lens according to claim 1 or 3, characterized in that: The phase function of the diffractive optical structure includes a quadratic phase coefficient A1, a quartic phase coefficient A2 and a sextic phase coefficient A3, and |A3|>|A2|>|A1|.

7. The myopia prevention and control lens according to claim 1, characterized in that: The shape of the control area is a plane, a spherical surface or an aspherical surface.

8. The myopia prevention and control lens according to claim 1, characterized in that: The diffraction ring includes a plurality of steps, the distances between the steps are the same, and the heights of the steps are the same.

9. The myopia prevention and control lens according to claim 1, characterized in that: The diffraction order of the diffraction optical structure is first order.

10. A pair of myopia prevention and control glasses, characterized in that: The invention comprises the myopia prevention and control lens described in any one of claims 1 to 9.

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