A contact lens

Abstract

The present application provides a kind of orthokeratology lens, including base arc area, and from the periphery of the base arc area outwardly continuously formed reverse arc area, adaptation arc area and peripheral arc area, the space defined between the reverse arc area and cornea is periodically changed in circumferential direction, with cyclically arranged small space and large space. Thus the negative pressure given to the cornea is also different, leading to the off-focus ring formed in the periphery of the cornea is unevenly distributed, compared with traditional orthokeratology lens, more high-order aberrations are generated in retinal imaging, and the effect of delaying axial elongation is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of orthokeratology lenses, in particular to an orthokeratology lens. BACKGROUND

[0002] An orthokeratology lens is a high rigidity and good permeability contact lens, which is made of special high oxygen permeability material, aiming to provide temporary vision correction and effectively control the progression of myopia. This lens contains base curve area, reverse curve area, fitting curve area and peripheral curve area from center to outside, each area has its unique function and design requirements.

[0003] The working principle of the orthokeratology lens is that the base curve area does not match the shape of the central cornea. This special design allows the orthokeratology lens to exert pressure on the cornea and slightly change the curvature of the cornea under the pressure of the eyelid in the closed eye state, thereby achieving temporary correction of refractive errors. Long-term wearing of orthokeratology lenses, especially during sleep at night, the special design of the reverse curve area can form a myopic defocus ring at the periphery of the cornea. This defocus ring has a specific aberration on the retinal image, which helps to slow down the elongation of the eye axis and control the development of myopia.

[0004] In the traditional design of orthokeratology lenses, the reverse curve area is usually a narrow circular ring structure, which forms a myopic defocus ring at the periphery of the cornea, mainly introducing spherical aberration, and also introducing a small amount of high-order aberration. Although spherical aberration plays a major role in slowing down the growth of the eye axis, high-order aberration also plays an active role. However, due to the design limitations of traditional orthokeratology lenses, its ability to introduce high-order aberration is limited, which is attributed to the irregularity of the cornea itself rather than the lens structure. Therefore, by increasing the cavity volume of the reverse curve area, the defocus ring formed by the traditional orthokeratology lens at the mid-peripheral cornea will produce a larger defocus amount, and the spherical aberration in the retinal image will also increase, but the change of high-order aberration in the retinal image is minimal. SUMMARY

[0005] Based on this, the purpose of the present application is to provide an orthokeratology lens for solving the technical problems mentioned in the background.

[0006] The present application provides an orthokeratology lens, which comprises a base curve area, and a reverse curve area, a fitting curve area and a peripheral curve area formed continuously outward from the periphery of the base curve area. The space defined between the reverse curve area and the cornea periodically changes in the circumferential direction, with small spaces and large spaces arranged alternately in cycles.

[0007] Further, the orthokeratology lens, wherein the outer edge of the base curve zone is circular, and the radial distance from the outer edge of the reverse curve zone to the center point of the base curve zone periodically varies along the circumferential direction, so that the reverse curve zone has cyclically and alternately arranged narrow edge regions and wide edge regions along the circumferential direction, the narrow edge regions defining the small spaces, and the wide edge regions defining the large spaces.

[0008] Further, the orthokeratology lens, wherein the radial width of the reverse curve zone satisfies the following formula:

[0009] Formula One:

[0010]

[0011] wherein the WRC is the radial width of the reverse curve zone at the angle θ, the WRC1 is the maximum radial width of the reverse curve zone, the WRC2 is the minimum radial width of the reverse curve zone, the n is the number of periods, and the θ is the angle formed with the horizontal 3 o'clock direction.

[0012] Further, the orthokeratology lens, wherein the n≥1.

[0013] Further, the orthokeratology lens, wherein the outer edge of the base curve zone is circular, and the radial distance from the outer edge of the reverse curve zone to the center point of the base curve zone periodically varies along the circumferential direction, so that the reverse curve zone has cyclically and alternately arranged narrow edge regions and wide edge regions along the circumferential direction, the narrow edge regions defining the small spaces, and the wide edge regions defining the large spaces.

[0014] Further, the orthokeratology lens, wherein the radial width of the reverse curve zone satisfies the following formula:

[0015] Formula Two:

[0016]

[0017] wherein the WRC is the radial width of the reverse curve zone at the angle θ, the WRC1 is the maximum radial width of the reverse curve zone, the WRC2 is the minimum radial width of the reverse curve zone, the n is the number of periods, and the θ is the angle formed with the horizontal 3 o'clock direction.

[0018] Further, the orthokeratology lens, wherein the outer edges of the base curve zone and the reverse curve zone are both circular, and the center points of the two zones coincide, the side of the reverse curve zone facing the cornea is a wave surface, the wave surface has periodically undulating downward curved surfaces and upward curved surfaces along the circumferential direction, the downward curved surfaces defining the small spaces, and the upward curved surfaces defining the large spaces.

[0019] Further, the orthokeratology lens, wherein the radial curvature radius of the wave surface varies periodically with the change of the circumferential angle.

[0020] Further, the orthokeratology lens, wherein the radial curvature radius of the wave surface satisfies the following formula:

[0021] Formula three:

[0022]

[0023] wherein the R(θ) is the radial curvature radius of the wave surface at the θ angle, the R max is the maximum radial curvature radius of the wave surface, the R min is the minimum radial curvature radius of the wave surface, and the n is the period number, and the θ=[0, 2*π].

[0024] Further, the orthokeratology lens, wherein the n is an odd number or an even number.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] The space defined between the reverse arc area and the cornea varies periodically along the circumferential direction, and has cyclically alternating small spaces and large spaces, so that the negative pressure applied to the cornea is also different, resulting in uneven distribution of the defocus ring formed in the cornea periphery, and compared with the traditional orthokeratology lens, more high-order aberrations are generated in the retinal imaging, and the effect of delaying the axial elongation is better. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structure schematic view of the orthokeratology lens in the first embodiment of the present application;

[0028] Figure 2 It is a sectional view of the orthokeratology lens in the first embodiment of the present application;

[0029] Figure 3 It is a structure schematic view of the orthokeratology lens in the second embodiment of the present application;

[0030] Figure 4 It is a sectional view of the orthokeratology lens in the second embodiment of the present application;

[0031] Figure 5 It is a structure schematic view of the orthokeratology lens in the third embodiment of the present application;

[0032] Figure 6 It is a structure schematic view of the orthokeratology lens in the fourth embodiment of the present application;

[0033] Figure 7 It is a structure schematic view of the wave surface in the fourth embodiment of the present application;

[0034] Figure 8 A cross-sectional view of a contact lens in the fourth embodiment of the present application;

[0035] Figure 9 A cross-sectional view of a contact lens in the fourth embodiment of the present application when the number of periods is even;

[0036] Figure 10 A cross-sectional view of a contact lens in the fourth embodiment of the present application when the number of periods is odd;

[0037] Explanation of main element symbols:

[0038] 10, base curve area; 20, reverse curve area; 30, fitting curve area; 40, peripheral curve area; 51, narrow edge area; 52, wide edge area; 100, cornea; 60, wave surface; 61, downwardly inclined surface; 62, upwardly inclined surface.

[0039] The following detailed description will further describe the present application with reference to the above-described drawings. DETAILED DESCRIPTION

[0040] In order to facilitate the understanding of the present application, the following will make a more comprehensive description of the present application with reference to the relevant drawings. The drawings show several embodiments of the present application. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0041] It should be noted that when an element is referred to as being "fixedly attached" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. As used herein the terms "vertical", "horizontal", "left", "right", and the like are merely for purposes of illustration.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0043] First Embodiment

[0044] Referring to Figure 1 and Figure 2The first embodiment of the present application includes a base curve area 10, a reverse curve area 20, an adaptation curve area 30 and a peripheral curve area 40 which are formed continuously from the periphery of the base curve area 10 outward, and the space between the reverse curve area 20 and the cornea 100 periodically changes along the circumferential direction, with small spaces and large spaces arranged alternately in cycles.

[0045] It can be understood that the space between the reverse curve area 20 and the cornea 100 periodically changes along the circumferential direction, with small spaces and large spaces arranged alternately in cycles, so that the negative pressure applied to the cornea 100 is also different, resulting in uneven distribution of the defocus ring formed in the periphery of the cornea 100, more high-order aberrations in retinal imaging compared with traditional orthokeratology lenses, and better effect of delaying axial elongation.

[0046] Further, the outer edge of the base curve area 10 is circular, and the radial distance from the outer edge of the reverse curve area 20 to the center point of the base curve area 10 periodically changes along the circumferential direction, so that the reverse curve area 20 has narrow edge areas 51 and wide edge areas 52 arranged alternately in cycles along the circumferential direction, the narrow edge areas 51 defining the small spaces, and the wide edge areas 52 defining the large spaces.

[0047] It can be understood that in the design of orthokeratology lenses, the cavity volume between the reverse curve area 20 and the cornea 100 directly affects the negative pressure applied to the cornea 100. Therefore, in this embodiment, by arranging the narrow edge areas 51 and the wide edge areas 52 alternately in cycles along the circumferential direction of the reverse curve area 20, the cavity volume formed between the wide edge areas 52 and the cornea 100 is larger, while the space formed between the narrow edge areas 51 and the cornea 100 is relatively small, so that the negative pressure applied to the cornea 100 by the reverse curve area 20 at the wide edge areas 52 is greater than that at the narrow edge areas 51. After long-term wearing, the entire anterior surface of the cornea 100 will form a defocus ring with uneven distribution of defocus amount, which will introduce more high-order aberrations for imaging on the retina. These high-order aberrations, especially the coma, are believed to have a positive effect on slowing down the growth of the eye axis, thereby helping to improve the effect of myopia control.

[0048] Further, the outer edges of the adaptation curve area 30 and the peripheral curve area 40 are circular, and the center points of the two are coincided with the center point of the base curve area 10. For details, see Figure 1In this embodiment, the base arc region 10 is a circular arc surface structure in the central region of the molding mirror, the reverse arc region 20 surrounds the base arc region 10 to form a slightly narrower special-shaped ring structure, the adaptive arc region 30 surrounds the reverse arc region 20 to form a slightly wider special-shaped ring structure, and the peripheral arc region 40 surrounds the adaptive arc region 30 to form a relatively narrow circular ring structure. The radial distance from the inner edge of the reverse arc region 20 to the center of the molding mirror does not change with the change of the circumferential angle, while the radial distance from the outer edge of the reverse arc region 20 to the center of the molding mirror changes periodically with the change of the circumferential angle. The radial distance from the inner edge of the adaptive arc region 30 to the center of the molding mirror changes periodically with the change of the circumferential angle, while the radial distance from the outer edge of the adaptive arc region 30 to the center of the molding mirror does not change with the change of the circumferential angle.

[0049] In addition, it is worth mentioning that since the outer edge of the adaptive arc region 30 is circular, the radial width of the adaptive arc region 30 is the widest on the cross section where the radial width of the reverse arc region 20 is the narrowest, and the radial width of the adaptive arc region 30 is the narrowest on the cross section where the radial width of the reverse arc region 20 is the widest. Therefore, while the reverse arc region 20 exerts greater pressure, the narrower design of the adaptive arc region 30 can buffer such pressure, which helps to form a more uniform pressure distribution on the cornea 100 and avoid forming excessive pressure points on the cornea 100.

[0050] Specifically, the radial width of the reverse arc region 20 satisfies the following formula:

[0051] Formula one:

[0052]

[0053] wherein WRC is the radial width of the reverse arc region 20 at angle θ, WRC1 is the maximum radial width of the reverse arc region 20, WRC2 is the minimum radial width of the reverse arc region 20, n is the number of periods, and θ is the angle formed with the horizontal 3 o'clock direction.

[0054] It should be noted that in this embodiment, the radial width of the reverse arc region 20 is equal to the distance from the outer edge of the reverse arc region 20 to the center point of the base arc region 10 minus the radius of the base arc region 10. In this embodiment, the radial width of the reverse arc region 20 changes periodically along the circumferential direction, and the number of periods n satisfies formula one, that is, there are three groups of narrow edge regions 51 and wide edge regions 52 that cycle and alternate along the circumferential direction. This design increases the adaptability of the molding mirror, so that it can better adapt to different parts and shapes of the cornea 100, thereby improving the comfort and molding effect of wearing.

[0055] In actual applications, in order to meet the individual differences of different corneas 100, the overall volume of the cavity of the reverse arc area 20 can be adjusted by changing the curvature of the reverse arc area 20, so as to control the spherical aberration generated in retinal imaging; secondly, the distribution of the cavity volume of the reverse arc area 20 can be adjusted by changing the difference between the maximum radial width and the minimum radial width of the reverse arc area 20 or the number of periods, so as to control the high-order aberration in retinal imaging.

[0056] To sum up, in the above-mentioned embodiments of the present application, the space defined between the reverse arc area 20 and the cornea 100 periodically changes in the circumferential direction, and has cyclically and alternately arranged small spaces and large spaces, so that the negative pressure applied to the cornea 100 is also different, resulting in uneven distribution of the defocus ring formed in the periphery of the cornea 100. Compared with the traditional orthokeratology lens, more high-order aberrations are generated in retinal imaging, and the effect of delaying the growth of the eye axis is better.

[0057] Second embodiment

[0058] Please refer to Figure 3 and Figure 4 In the second embodiment of the present application, the orthokeratology lens is different from the orthokeratology lens in the first embodiment in that the outer edge of the reverse arc area 20 is circular, and the radial distance from the outer edge of the base arc area 10 to the center point of the reverse arc area 20 periodically changes in the circumferential direction, so that the reverse arc area 20 has cyclically and alternately arranged narrow edge regions 51 and wide edge regions 52 in the circumferential direction, the narrow edge regions 51 define the small spaces, and the wide edge regions 52 define the large spaces. As can be seen, this embodiment is a deformation based on the first embodiment and can achieve the same technical effects as the first embodiment, so it will not be described in detail.

[0059] Further, the outer edges of the adaptation arc area 30 and the peripheral arc area 40 are circular, and the center points of the two coincide with the center point of the reverse arc area 20. For details, please refer to Figure 3 In this embodiment, the base arc area 10 is a special-shaped arc surface structure in the central region of the lens body, and the radial distance from the outer edge to the center of the orthokeratology lens periodically changes with the change of the circumferential angle, the adaptation arc area 30 surrounds the reverse arc area 20 and has a slightly wider circular ring structure, and the radial distances from the inner and outer edges to the center of the orthokeratology lens do not change with the change of the circumferential angle, and the radial distance from the inner edge of the reverse arc area 20 to the center of the orthokeratology lens periodically changes with the change of the circumferential angle, and the radial distance from the outer edge to the center of the orthokeratology lens does not change with the change of the circumferential angle.

[0060] In addition, it is worth mentioning that, since the outer edge of the reverse curve area 20 is circular, the radial width of the base curve area 10 is the widest on the cross section where the radial width of the reverse curve area 20 is the narrowest, and the radial width of the base curve area 10 is the narrowest on the cross section where the radial width of the reverse curve area 20 is the widest. Thus, while a greater pressure is exerted on the reverse curve area 20, the narrower design of the base curve area 10 can buffer such pressure, helping to form a more uniform pressure distribution on the cornea 100 and avoiding the formation of excessive pressure points on the cornea 100.

[0061] Specifically, the radial width of the reverse curve area 20 satisfies the following formula:

[0062] Formula two:

[0063]

[0064] wherein the WRC is the radial width of the reverse curve area 20 at the angle θ, the WRC1 is the maximum radial width of the reverse curve area 20, the WRC2 is the minimum radial width of the reverse curve area 20, the n is the number of periods, and the θ is the angle formed with the horizontal 3 o'clock direction.

[0065] It should be noted that in this embodiment, the radial width of the reverse curve area 20 is equal to the radius of the reverse curve area 20 minus the distance from the outer edge of the base curve area 10 to the center point of the reverse curve area 20. In this embodiment, the radial width of the reverse curve area 20 periodically changes along the circumferential direction, and the number of periods n satisfies formula two, i.e., there are 3 groups of narrow edge regions 51 and wide edge regions 52 that cyclically alternate along the circumferential direction. This design increases the adaptability of the orthokeratology lens, allowing it to better adapt to different parts and shapes of the cornea 100, thereby improving the comfort and molding effect of wearing.

[0066] Third embodiment

[0067] Please refer to Figure 5 The orthokeratology lens in the third embodiment of the present application differs from the orthokeratology lens in the first embodiment in that there are 6 groups of narrow edge regions 51 and wide edge regions 52 that cyclically alternate along the circumferential direction. It can be understood that this embodiment has an additional 3 groups of periods compared to the first embodiment, so that the defocus ring formed in the periphery of the cornea 100 can provide more different directions of coma for retinal imaging, bringing better myopia control effect.

[0068] Fourth embodiment

[0069] Please refer to Figures 6-10 The orthokeratology lens in the fourth embodiment of the present application differs from the orthokeratology lens in the first embodiment in that:

[0070] The outer edges of the base curve area 10 and the reverse curve area 20 are circular, and the centers of the circles coincide, and the side of the reverse curve area 20 facing the cornea 100 is a wave surface 60, the wave surface 60 has a downward curve surface 61 and an upward curve surface 62 periodically fluctuating in the circumferential direction, the downward curve surface 61 defines the small space, and the upward curve surface 62 defines the large space.

[0071] It can be understood that in this embodiment, by designing the side of the reverse curve area 20 facing the cornea 100 as a wave surface 60 periodically fluctuating, the space defined between the reverse curve area 20 and the cornea 100 periodically changes in the circumferential direction, resulting in uneven distribution of the defocus ring formed in the periphery of the cornea 100, more high-order aberrations in retinal imaging compared to traditional cornea 100 molding lenses, and better effect of delaying axial elongation.

[0072] In this embodiment, the radial curvature radius of the wave surface periodically changes with the change of the circumferential angle, and satisfies the following formula:

[0073] Formula three:

[0074]

[0075] Wherein, R(θ) is the radial curvature radius of the wave surface 60 at θ angle, R max is the maximum radial curvature radius of the wave surface 60, R min is the minimum radial curvature radius of the wave surface 60, n is the number of periods, and θ=[0, 2*π].

[0076] It should be noted that in this embodiment, by adjusting the difference between the maximum radial curvature radius and the minimum radial curvature radius of the wave surface 60 or the number of periods, the yield of high-order aberrations in retinal imaging can be controlled to meet the needs of different cornea customization.

[0077] Referring to Figure 7 , the wave surface 60 with a period number n of 6 is shown, wherein the radial angles 0° to 60°, 60° to 120°, 120° to 180°, 180° to 240°, 240° to 300°, and 300° to 360° are 1 to 6 change periods of the radial curvature radius of the wave surface 60, and in each change period, the radial curvature radius of the wave surface first increases from the minimum radial curvature radius R min to the maximum radial curvature radius R max , and then decreases from the maximum radial curvature radius R max to the minimum radial curvature radius R min . Taking the period from 0° to 60° as an example, wherein 0° to 30° is a downward curve surface, and 30° to 60° is an upward curve surface.

[0078] It should be noted that the radial curvature radius is used to reflect the steepness of the wave surface, the larger the radial curvature radius, the flatter the corresponding wave surface, on the contrary, the smaller the radial curvature radius, the steeper the corresponding wave surface. For details, please refer to Figure 8 The surface with the smallest radial curvature radius in the reverse arc area 20 has a larger cavity volume than the surface with the largest radial curvature radius, and the negative pressure generated on the anterior surface of the cornea 100 is larger, and the accumulated corneal epithelial cells will be more, so that the peripheral part of the shaped cornea 100 will form a defocus ring with uneven defocus distribution, which will bring more high-order aberrations to the retinal imaging, and improve the effect of myopia control.

[0079] Referring to Figure 9 In one embodiment of the present embodiment, when n is even, the radial curvature radius R l and R r of the wave surface 60 on both sides in any radial section are equal, which means that the wave surface 60 has radial symmetry, thereby having a relatively uniform stress distribution.

[0080] Referring to Figure 10 In another embodiment of the present embodiment, when n is odd, the radial curvature radius R l and R r of the wave surface 60 on both sides in any radial section are not equal, which means that the wave surface 60 is radially asymmetric, which helps to generate different pressure distributions in different areas of the cornea, thereby more effectively shaping the cornea.

[0081] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0082] The above-described embodiments only express several embodiments of the present application, which are described in more detail and in more detail, but cannot be understood as limiting the scope of the present patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. A corneal reshaping lens, comprising a base curve region, and a reversal curve region, an adaptation curve region, and a peripheral curve region continuously formed outward from the periphery of the base curve region, characterized in that, The space defined between the reversal arc zone and the cornea varies periodically along the circumferential direction, with alternating small and large spaces. The radial width of the reverse arc region satisfies either Formula 1 or Formula 2; Formula 1: ； Formula 2: ； Wherein, WRC is the radial width of the reversing arc region at angle θ, WRC1 is the maximum radial width of the reversing arc region, WRC2 is the minimum radial width of the reversing arc region, n is the number of cycles, and θ is the angle formed with the horizontal 3 o'clock direction; The side of the inverted arc region facing the cornea is a wavefront, and the radial radius of curvature of the wavefront satisfies the following formula: Formula 3: ； Wherein, R(θ) is the radial radius of curvature of the wavefront at angle θ, and R max R is the maximum radial radius of curvature of the wavefront. min Let n be the minimum radial radius of curvature of the wavefront, n be the number of periods, and θ = [0, 2π].

2. The orthokeratology lens according to claim 1, characterized in that, In Formula 1, the outer edge of the base arc region is circular, and the radial distance from the outer edge of the reverse arc region to the center point of the base arc region varies periodically along the circumferential direction. Thus, the reverse arc region has alternating narrow and wide side regions along the circumferential direction. The narrow side region defines the small space, and the wide side region defines the large space.

3. The orthokeratology lens according to claim 1, characterized in that, The n≥1.

4. The orthokeratology lens according to claim 1, characterized in that, In Formula 2, the outer edge of the reverse arc region is circular, and the radial distance from the outer edge of the base arc region to the center point of the reverse arc region varies periodically along the circumferential direction. Thus, the reverse arc region has alternating narrow and wide side regions along the circumferential direction. The narrow side region defines the small space, and the wide side region defines the large space.

5. The orthokeratology lens according to claim 1, characterized in that, The outer edges of the base arc region and the reverse arc region are both circular, and their centers coincide. The wave surface has a downward sloping surface and an upward sloping surface that undulate periodically along the circumference. The downward sloping surface defines the small space, and the upward sloping surface defines the large space.

6. The orthokeratology lens according to claim 5, characterized in that, The radial radius of curvature of the wavefront changes periodically with the circumferential angle.

7. The orthokeratology lens according to claim 1, characterized in that, The number n can be either odd or even.

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