Orthokeratology lens

Abstract

The utility model discloses an orthokeratology lens. The orthokeratology lens comprises a first surface and a second surface which are oppositely arranged, the first surface comprises an orthokeratology arc area, and the orthokeratology arc area is used for changing the shape of the cornea during wearing; the second surface comprises a peripheral out-of-focus arc area, and the peripheral out-of-focus arc area is used for imaging an object image on the side, close to the first surface, of the retina during wearing. According to the technical scheme, the peripheral out-of-focus arc area is arranged on the second surface, so that the effect of peripheral myopia out-of-focus can be achieved when a user wears the orthokeratology lens in the non-sleep period, the problem that the myopia control effect of the orthokeratology lens is reduced when the sleep time of the user is insufficient is solved, and peripheral myopia out-of-focus with extra time is provided. In addition, when the user wears the orthokeratology lens in the non-sleep period, the orthokeratology time can be prolonged to a certain extent, and the myopia control effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optics, and particularly relates to a corneal reshaping lens. Background Art

[0002] Current myopia control methods, especially corneal reshaping lenses for children, face significant limitations. As children grow older, their learning burden increases, resulting in reduced sleep time. This reduction in sleep time directly affects the effectiveness of traditional corneal reshaping lenses because corneal reshaping requires sufficient time during sleep to adjust the corneal shape and thus control the progression of myopia. For children with insufficient sleep time, the reshaping time of traditional corneal reshaping lenses becomes insufficient, leading to weakened corneal reshaping effects, and further reducing the ability to control myopia and the treatment effect. Summary of the Utility Model

[0003] The utility model provides a corneal reshaping lens to solve the problem that the effect of controlling myopia by the corneal reshaping lens decreases due to the decrease in sleep time in the prior art.

[0004] According to the utility model, a corneal reshaping lens is provided, which includes: a first surface and a second surface arranged oppositely;

[0005] The first surface includes a corneal reshaping arc region, and the corneal reshaping arc region is used to change the shape of the cornea when worn;

[0006] The second surface includes a peripheral defocus arc region, and the peripheral defocus arc region is used to image an object on the side closer to the first surface of the retina when worn.

[0007] Optionally, the peripheral defocus arc region includes a positive addition region and an overcorrection region;

[0008] The dioptric power of the positive addition region is greater than the prescribed dioptric power; the dioptric power of the overcorrection region is less than the prescribed dioptric power.

[0009] Optionally, the positive addition region includes a first sub-positive addition region;

[0010] The overcorrection region surrounds the first sub-positive addition region;

[0011] The dioptric power P1 of the first sub-positive addition region and the prescribed dioptric power P0 satisfy P1 - P0 ≥ +1.5D;

[0012] The dioptric power P2 of the overcorrection region and the prescribed dioptric power P0 satisfy -4D ≤ P2 - P0 ≤ -1D.

[0013] Optionally, the positive addition region further includes a second sub-positive addition region and a third sub-positive addition region;

[0014] The second sub-positive addition region surrounds the overcorrection region, and the third sub-positive addition region surrounds the second sub-positive addition region;

[0015] The optical power P3 of the second sub-addition optical zone and the prescription optical power P0 satisfy P3 - P0 ≥ +1D, and the optical power P4 of the third sub-addition optical zone and the prescription optical power P0 satisfy P4 - P0 ≥ +2D.

[0016] Optionally, the addition optical zone includes a fourth sub-addition optical zone;

[0017] The fourth sub-addition optical zone surrounds the overcorrection zone;

[0018] The optical power P5 of the fourth sub-addition optical zone and the prescription optical power P0 satisfy P5 - P0 ≥ +1.5D;

[0019] The optical power P2 of the overcorrection zone and the prescription optical power P0 satisfy -1D ≤ P2 - P0 ≤ 0D.

[0020] Optionally, the overcorrection zone includes a first sub-region;

[0021] The distance from any position on the first sub-region to the center of the second surface is 1.0 mm.

[0022] Optionally, the fourth sub-addition optical zone includes a second sub-region;

[0023] The distance b from any position on the second sub-region to the center of the second surface satisfies 1.5 mm ≤ b ≤ 2.5 mm.

[0024] Optionally, the radius of curvature R front (x) at a on the peripheral defocus arc zone and the optical power P(x) at a satisfy:

[0025]

[0026] where x is the distance from a to the center of the second surface; P(x) is the optical power at a; R back (x) is the radius of curvature of the first surface corresponding to a; n lens is the refractive index of the orthokeratology lens; n tear is the refractive index of the tear fluid; n cornea is the refractive index of the cornea.

[0027] Optionally, the orthokeratology lens further includes a patterned structure;

[0028] The patterned structure is provided on the second surface;

[0029] Alternatively, the patterned structure partially penetrates the orthokeratology lens.

[0030] Optionally, the patterned structure includes a third sub-region;

[0031] The distance c from any position on the third sub-region to the center of the second surface satisfies 1.0 mm ≤ c ≤ 2.5 mm.

[0032] The technical solution of the present utility model is to provide a peripheral defocus arc area on the second surface, so that the user can also achieve the effect of peripheral myopic defocus during non-sleep periods, thereby compensating for the problem of reduced myopia control effect of corneal reshaping lenses when the user has insufficient sleep time, and providing peripheral myopic defocus for an additional period of time. In addition, when the user wears the corneal reshaping lens during non-sleep periods, the shaping time can be extended to a certain extent, improving the myopia control effect.

[0033] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present utility model, nor is it used to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1 is a schematic structural diagram of a corneal reshaping lens from a first angle according to an embodiment of the present utility model;

[0036] Figure 2 is a schematic structural diagram of a first corneal reshaping lens from a second angle according to an embodiment of the present utility model;

[0037] Figure 3 is a schematic diagram of the dioptric power distribution of a first second surface according to an embodiment of the present utility model;

[0038] Figure 4 is a schematic structural diagram of a second corneal reshaping lens from a second angle according to an embodiment of the present utility model;

[0039] Figure 5 is a schematic diagram of the dioptric power distribution of a second second surface according to an embodiment of the present utility model;

[0040] Figure 6 is a schematic structural diagram of a third corneal reshaping lens from a second angle according to an embodiment of the present utility model. Detailed Embodiments

[0041] To enable those skilled in the art to better understand the solutions of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described here can be implemented in an order other than those illustrated or described here.

[0043] Figure 1 is a schematic diagram of the first angle structure of a corneal reshaping lens provided according to an embodiment of the present utility model, as Figure 1 shown, the corneal reshaping lens includes: a first surface 1 and a second surface 2 which are oppositely arranged;

[0044] The first surface 1 includes a corneal reshaping arc area 11, and the corneal reshaping arc area 11 is used to change the shape of the cornea when worn;

[0045] The second surface 2 includes a peripheral defocus arc area 21, and the peripheral defocus arc area 21 is used to image an object on the side close to the first surface 1 of the retina when worn.

[0046] Among them, the first surface 1 can be the surface closer to the cornea side during the user's wearing process. The first surface 1 includes a corneal reshaping arc area 11, which can be used to change the shape of the cornea during the user's wearing, especially during sleep, so as to control the progression of myopia. In some embodiments, the corneal reshaping arc area 11 can include an optical zone BC, an alignment arc zone AC, a reverse arc zone RC, and a peripheral arc zone PC. The optical zone BC is used to shape the central area of the user's cornea into the desired shape to correct myopia; the alignment arc zone AC is close to the corneal morphology and is used to ensure stable positioning when the corneal reshaping lens is worn; the reverse arc zone RC is between the optical zone BC and the alignment arc zone AC and surrounds the optical zone BC. The reverse arc zone RC can use the tear storage to form a micro-protrusion, generating a high plus-power area, and then forming myopic defocus during imaging, so as to control the progression of the user's myopia; the peripheral arc zone PC surrounds the alignment arc zone AC, and the curvature radius of the peripheral arc zone PC becomes larger relative to the alignment arc zone AC, so that it warps on the cornea during wearing to promote tear flow and ensure the comfort of the human eye. It can be understood that the design of the corneal reshaping arc area 11 can be designed according to the needs of the user, and the embodiment of the present utility model does not specifically limit the shape of the corneal reshaping arc area 11.

[0047] Among them, the second surface 2 is located on the side of the first surface 1 away from the cornea. The second surface 2 includes a peripheral defocus arc area 21, which can be used to make the focus of the object image fall on the side of the retina closer to the first surface 1 during the user's wearing, especially when viewing objects during non-sleep periods, while the focus of the object image on the retina center falls on the retina, forming peripheral myopic defocus, so as to provide the effect of myopia control for the user during non-sleep periods.

[0048] Among them, under normal circumstances, the focus of the object image passing through the user's eye refractive system should exactly fall on the retina. The myopia defect causes the focus of the object image passing through the user's eye refractive system to fall in front of the retina, so that the object image viewed by the user is not clear. The corneal reshaping lens can make the central focus of the object image fall on the retina through corneal reshaping, and the other foci of the object image fall in front of the retina, so as to inhibit the growth of the eye axis and thus control the progression of myopia.

[0049] It can be understood that on the one hand, the corneal reshaping lens can be worn during sleep to achieve the effect of adjusting the corneal morphology, and thus control the progression of myopia; on the other hand, it can also be worn during non-sleep periods. Using the design of the second surface 2, peripheral myopic defocus is generated, and thus the progression of myopia is controlled. When the user does not have enough sleep time, the reshaping effect of the corneal reshaping arc area 11 decreases, and thus the effect of controlling myopia decreases. However, the second surface 2 of the embodiment of the present utility model can make up for the defect caused by insufficient sleep time, so that the corneal reshaping lens can also produce the effect of peripheral myopic defocus when worn during non-sleep periods, and thus control the progression of myopia.

[0050] In the technical solution of the embodiment of the present utility model, by providing a peripheral defocus arc region on the second surface, the user can also achieve the effect of peripheral myopic defocus during non-sleep periods, thereby compensating for the problem of reduced myopia control effect of corneal reshaping lenses when the user has insufficient sleep time, and providing additional time for peripheral myopic defocus. In addition, when the user wears the corneal reshaping lens during non-sleep periods, the shaping time can be extended to a certain extent, improving the myopia control effect.

[0051] Optionally, Figure 2 is a schematic structural diagram of the second angle of the first corneal reshaping lens provided according to the embodiment of the present utility model. Combining Figure 1 and Figure 2 as shown, the peripheral defocus arc region 21 includes a positive addition region 211 and an overcorrection region 212;

[0052] The dioptric power of the positive addition region 211 is greater than the prescription dioptric power; the dioptric power of the overcorrection region 212 is less than the prescription dioptric power.

[0053] Among them, the prescription dioptric power can be the dioptric power for correcting the myopia degree of the user, and the prescription dioptric power is a negative dioptric power. Setting the prescription dioptric power on the peripheral defocus arc region 21 can make the focus of the object image fall on the retina to form a clear object image.

[0054] Among them, the dioptric power on the positive addition region 211 is greater than the prescription dioptric power. Such a setting can make the focus of the object image fall in front of the retina, forming myopic defocus. Due to the limitation of the pupil of the human eye, after setting the positive addition region 211 on the second surface 2, myopic defocus can be formed on the entire retina. To ensure that the object image obtained by the user is as clear as possible, an overcorrection region 212 is also provided on the peripheral defocus arc region 21. The dioptric power on the overcorrection region 212 is less than the prescription angle. Such a setting can make the focus of the object image fall behind the retina, forming hyperopic defocus, so as to balance the control of myopic defocus by the positive addition region 211, make the focus of the object image fall on the central region of the retina, and achieve the purpose of peripheral retinal myopic defocus.

[0055] It can be understood that due to the limitation of the positive addition region 211 and the overcorrection region 212, the dioptric power on the peripheral defocus arc region 21 is different, and different dioptric powers correspond to different curvature radii on the peripheral defocus arc region 21. Therefore, the second surface 2 can be composed of arc segments of spherical surfaces with different curvature radii, non-spherical arc segments composed of conic curves, or high-order non-spherical arc segments, or it can also be multiple arc segments formed by them in sequence. In the embodiment of the present utility model, the shape of the peripheral defocus arc region 21 is determined by the dioptric power on the second surface 2, and the embodiment of the present utility model does not limit this.

[0056] In some embodiments, the curvature radius R at point a on the peripheral defocus arc region 21 front(x) and the optical power P(x) at a satisfy:

[0057]

[0058] where x is the distance from a to the center of the second surface 2; P(x) is the optical power at a; R back (x) is the radius of curvature of the first surface 1 corresponding to a; n lens is the refractive index of the orthokeratology lens; n tear is the refractive index of the tear; n cornea is the refractive index of the cornea. Among them, a is an arbitrary position on the peripheral defocus arc region 21. The center of the second surface 2 can be directly opposite the center of the user's pupil. The refractive index of the orthokeratology lens is determined by the material of the orthokeratology lens, and different materials correspond to different refractive indices. The refractive index of the tear is generally calculated and statistically 1.336, and the refractive index of the cornea is generally calculated and statistically 1.376 during calculation. R back(x) can be the radius of curvature of the position of the first surface 1 corresponding to a. P(x) is the optical power at a, and the optical power at a can be the prescription power P0 plus the addition power A(x). Since all except R front (x) are known quantities, the radius of curvature at different positions on the peripheral defocus arc region 21 can be calculated according to this formula.

[0059] In the technical solution of the embodiment of the present utility model, by setting a positive addition region and an overcorrection region on the peripheral defocus arc region, when imaging in the positive addition region, the focal point of the object image can fall in front of the retina, forming myopic defocus, and further enabling the second surface to play a role in controlling myopia. At the same time, an overcorrection region is set on the peripheral defocus arc region, so that hyperopic defocus is formed during imaging in the overcorrection region to balance the control of myopic defocus by the positive addition region, enabling the user to obtain a clear object image as much as possible while viewing objects and maintaining the effect of myopic defocus in the peripheral retina. While ensuring the effect of controlling myopia, the wearing experience of the user during non-sleep periods is improved.

[0060] Optionally, continuing to refer to Figure 1 and Figure 2 shown, the positive addition region 211 includes a first sub-positive addition region 2111;

[0061] The overcorrection region 212 surrounds the first sub-positive addition region 2111;

[0062] The optical power P1 of the first sub-positive addition region 2111 and the prescription power P0 satisfy P1 - P0 ≥ +1.5D;

[0063] The optical power P2 of the overcorrection region 212 and the prescription power P0 satisfy -4D ≤ P2 - P0 ≤ -1D.

[0064] Among them, the center of the first sub-additive power region 2111 can coincide with the center of the peripheral defocus arc region 21. Considering the technological limitations of the orthokeratology lens and the structure of the human eye, the projection of the additive power region 211 in the first direction z can be set as a circle, and the first direction z can be the direction from the second surface 2 to the first surface 1. The dioptric power P1 of the first sub-additive power region 2111 and the prescription dioptric power P0 satisfy P1 - P0 ≥ +1.5D, where P1 - P0 is the additive power A1(x) of the first sub-additive power region 2111, and the additive power A1(x) satisfies A1(x) ≥ +1.5D. It can be understood that the additive power on the first sub-additive power region 2111 can be a fixed value or a non-fixed value, and the embodiments of the present invention do not limit this. As Figure 3 shown, the first sub-additive power region 2111 is non-fixed value.

[0065] Among them, the center of the overcorrection region 212 can coincide with the center of the peripheral defocus arc region 21. Considering the technological limitations of the orthokeratology process and the structure of the human eye, the projection of the center of the overcorrection region 212 in the first direction z can be set as an annular shape, and this annular region surrounds the first sub-additive power region 2111. The dioptric power P2 of the overcorrection region 212 and the prescription dioptric power P0 satisfy -4D ≤ P2 - P0 ≤ -1D, where P2 - P0 is the additive power A2(x) of the overcorrection region 212, and the additive power A2(x) satisfies -4D ≤ A2(x) ≤ -1D. It can be understood that the additive power on the overcorrection region 212 can be a fixed value or a non-fixed value, and the embodiments of the present invention do not limit this. For example Figure 3 in the shown additive power curve, the overcorrection region 212 is non-fixed value.

[0066] It can be understood that since the structure of the human eye is a spherical structure with a certain radius of curvature, the projection of the first sub-additive power region 2111 along the first direction z can be set as a circular structure, which can better adapt to the structure of the pupil during wearing, and thus produce a good myopic defocus effect. Further, since the purpose of the overcorrection region 212 is to balance myopic defocus to a certain extent, the overcorrection region 212 is provided around the first sub-additive power region 2111. The overcorrection region 212 surrounds the first sub-additive power region 2111, so that the overcorrection region 212 can adapt to the pupil structure, and thus produce a better effect of balancing myopic defocus.

[0067] In some embodiments, the overcorrection region 212 includes a first sub-region; the distance from any position on the first sub-region to the center of the second surface 2 is 1.0 mm. That is, at least at a distance of 1.0 mm from the center of the second surface 2, the first sub-region is included. At the same time, in other overcorrection regions 212 except the first sub-region, there may also be overcorrection regions 212 that satisfy the corresponding dioptric power, and the embodiments of the present invention do not limit this.

[0068] Exemplarily,Figure 3 It is a schematic diagram of the dioptric power distribution of a second surface provided according to an embodiment of the present invention. Combining Figure 1 、 Figure 2 and Figure 3 as shown, at L1, it corresponds to the first sub-addition power region 2111, and the addition power A1(x) of the first sub-addition power region 2111 corresponding to L1 all satisfies A1(x) ≥ +1.5D, and the addition power on the first sub-addition power region 2111 changes linearly with the change of x; at L2, it corresponds to the overcorrection region 212, and the addition power A2(x) of the overcorrection region 212 corresponding to L2 all satisfies -4D ≤ A2(x) ≤ -1D, and the addition power on the overcorrection region 212 changes linearly with the change of x, where the position of x = 1.0 mm is the first sub-region. The radius of curvature of the peripheral defocus arc region 21 can be calculated according to the dioptric power at different positions, and then the structure of the second surface 2 can be obtained. Among them, there may be a first transition region between the first sub-addition power region 2111 and the overcorrection region 212. This first transition region has a certain addition power or does not have an addition power. In this example, in order to ensure the smoothness of the addition power curve, the first transition region is set as a curve with a changing addition power, which improves the visual effect when the user wears it.

[0069] In the technical solution of the embodiment of the present invention, by setting a first sub-addition power region in the addition power region, the addition power A1(x) of the first sub-addition power region is greater than or equal to 1.5D, and at the same time, an overcorrection region is set to surround the first sub-addition power region, and the dioptric power A2(x) of the overcorrection region satisfies -4D ≤ A2(x) ≤ -1D. Such a setting can make the peripheral defocus arc region have a good peripheral myopic defocus effect, ensuring that the user can see clearly when wearing and having a good effect of controlling myopia.

[0070] Optionally, continuing to refer to Figure 1 、 Figure 2 and Figure 3 as shown, the addition power region 211 further includes a second sub-addition power region 2112 and a third sub-addition power region 2113;

[0071] The second sub-addition power region 2112 surrounds the overcorrection region 212, and the third sub-addition power region 2113 surrounds the second sub-addition power region 2112;

[0072] The dioptric power P3 of the second sub-addition power region 2112 and the prescription dioptric power P0 satisfy P3 - P0 ≥ +1D, and the dioptric power P4 of the third sub-addition power region 2113 and the prescription dioptric power P0 satisfy P4 - P0 ≥ +2D.

[0073] Among them, the second sub-positive addition region 2112 can be used to further enhance the effect of peripheral myopic defocus. The second sub-positive addition region 2112 surrounds the overcorrection region 212. The projection of the second sub-positive addition region 2112 along the first direction z can also be an annular structure. The dioptric power P3 of the second sub-positive addition region 2112 and the prescription dioptric power P0 satisfy P3 - P0 ≥ +1D, that is, the positive addition power A3(x) of the second sub-positive addition region 2112 satisfies A3(x) ≥ +1D. It can be understood that since the position of the first sub-positive addition region 2111 corresponds to the center of the retina, the function of the overcorrection region 212 is to balance the myopic defocus effect of the first sub-positive addition region 2111. At this time, setting the second sub-positive addition region 2112, and the second sub-positive addition region 2112 surrounds the overcorrection region 212, can further enhance the effect of peripheral myopic defocus.

[0074] Among them, the third sub-positive addition region 2113 can be used to further enhance the effect of peripheral myopic defocus. The third sub-positive addition region 2113 surrounds the second sub-positive addition region 2112. The projection of the third sub-positive addition region 2113 along the first direction z can also be an annular structure. The dioptric power P4 of the third sub-positive addition region 2113 and the prescription dioptric power P0 satisfy P4 - P0 ≥ +2D, that is, the dioptric power A4(x) of the fourth sub-positive addition region 2114 satisfies A4(x) ≥ +2D.

[0075] It can be understood that the second sub-positive addition region 2112 is farther from the retina than the first sub-positive addition region 2111, and the third sub-positive addition region 2113 is farther from the retina than the second sub-positive addition region 2112. Therefore, the positive addition power of the second sub-positive addition region 2112 is set to be greater than that of the third sub-positive addition region 2113, so that a better peripheral myopic defocus effect can be generated in the periphery away from the center of the retina. In some embodiments, the distance from any position on the second sub-positive addition region 2112 to the center of the second surface 2 is greater than or equal to 1.75 mm; the distance from any position on the third sub-positive addition region 2113 to the center of the second surface 2 is greater than or equal to 2.75 mm.

[0076] Exemplarily, continue to refer to Figure 3As shown, at L3, it corresponds to the second sub-positive addition region 2112, and the positive addition degree A3(x) of the third sub-positive addition region 2113 corresponding to L3 all satisfies A3(x)≥+1D, and the positive addition degree on the third sub-positive addition region 2113 changes linearly with the change of x; at L4, it corresponds to the third sub-positive addition region 2113, and the positive addition degree A4(x) of the third sub-positive addition region 2113 corresponding to L4 all satisfies A4(x)≥+2D, and the positive addition degree on the third sub-positive addition region 2113 changes linearly with the change of x. According to the optical power at different positions, the curvature radius of the peripheral defocus arc region 21 can be calculated, and then the structure of the second surface 2 can be obtained. Among them, there may be a second transition region between the overcorrection region 212 and the second sub-positive addition region 2112, and there may be a third transition region between the second sub-positive addition region 2112 and the third sub-positive addition region 2113. The second transition region and the third transition region have a certain positive addition degree or do not have a positive addition degree. In this example, in order to ensure the smoothness of the positive addition degree curve, the second transition region and the third transition region are set as curves with changing positive addition degrees, which improves the visual effect when the user wears it.

[0077] The technical solution of the embodiment of the present invention further sets a second positive addition region and a third positive addition region on the basis of the first positive addition region and the overcorrection region, further increasing the effect of peripheral myopic defocus and improving the effect of controlling myopia on the second surface of the orthokeratology lens.

[0078] Optionally, Figure 4 is the second angular structural schematic diagram of the orthokeratology lens provided by the embodiment of the present invention. Combining Figure 1 、 Figure 2 and Figure 4 As shown, the positive addition region 211 includes a fourth sub-positive addition region 2114;

[0079] The fourth sub-positive addition region 2114 surrounds the overcorrection region 212;

[0080] The optical power P5 of the fourth sub-positive addition region 2114 and the prescription optical power P0 satisfy P5 - P0≥+1.5D;

[0081] The optical power P2 of the overcorrection region 212 and the prescription optical power P0 satisfy -1D≤P2 - P0≤0D.

[0082] Among them, the fourth sub-positive addition region 2114 can also be set to surround the overcorrection region 212. The center of the overcorrection region 212 can coincide with the center of the peripheral defocus arc region 21. Considering the limitations in the corneal reshaping lens manufacturing process and the structure of the human eye, the projection of the overcorrection region 212 in the first direction z can be set to be circular. The diopter P2 of the overcorrection region 212 and the prescription diopter P0 satisfy -1D ≤ P2 - P0 ≤ 0D, where P2 - P0 is the positive addition diopter A2(x) of the overcorrection region 212, and the positive addition diopter A2(x) satisfies -1D ≤ A2(x) ≤ 0D. It can be understood that the positive addition diopter on the overcorrection region 212 can be a fixed value or a non-fixed value, and the embodiments of the present invention do not limit this. Figure 5 is a schematic diagram of the diopter distribution of the second second surface provided according to an embodiment of the present invention. As Figure 5 shown, the overcorrection region 212 is non-fixed.

[0083] Among them, the center of the fourth sub-positive addition region 2114 can coincide with the center of the peripheral defocus arc region 21. Considering the limitations in the corneal reshaping process and the structure of the human eye, the projection of the center of the fourth sub-positive addition region 2114 in the first direction z can be set to be annular, and this annular region surrounds the overcorrection region 212. The diopter P5 of the fourth sub-positive addition region 2114 and the prescription diopter P0 satisfy P5 - P0 ≥ +1.5D, where P5 - P0 is the positive addition diopter A5(x) of the fourth sub-positive addition region 2114, and the positive addition diopter A5(x) satisfies A5(x) ≥ +1.5D. It can be understood that the positive addition diopter on the fourth sub-positive addition region 2114 can be a fixed value or a non-fixed value, and the embodiments of the present invention do not limit this. For example Figure 4 in the positive addition curve shown, the fourth sub-positive addition region 2114 is non-fixed.

[0084] It can be understood that since the structure of the human eye is a spherical structure with a certain radius of curvature, the projection of the overcorrection region 212 in the first direction z can be set to a circular structure, which can better adapt to the structure of the pupil during wearing, and thus produce a hyperopic defocus effect at the center and periphery of the retina. Further, since the purpose of the overcorrection region 212 is to balance myopic defocus to a certain extent, a fourth sub-positive addition region 2114 is provided outside the overcorrection region 212. The fourth sub-positive addition region 2114 surrounds the overcorrection region 212 to balance the hyperopic defocus effect of the overcorrection region 212 and balance the focal point of the image to the center of the retina, so that the user can obtain a clear image. It can be understood that since the purpose of the overcorrection region 212 is to balance the myopic defocus effect, when the overcorrection region 212 is set at the center of the peripheral defocus arc region 21, the positive addition diopter of the overcorrection region 212 should not be too large to ensure that the outer fourth sub-positive addition region 2114 can better balance the hyperopic defocus brought by the overcorrection region 212.

[0085] In some embodiments, the fourth sub-positive addition region 2114 includes a second sub-region; the distance b between any position on the second sub-region and the center of the second surface 2 satisfies 1.5 mm ≤ b ≤ 2.5 mm. That is, the second sub-region is included at least at a distance of 1.5 mm to 2.5 mm from the center of the second surface 2.

[0086] Exemplarily, as Figure 5 shown, at L5 corresponds to the overcorrection region 212, and the addition power A2(x) of the overcorrection region 212 corresponding to L5 all satisfies -1 D ≤ A2(x) ≤ 0 D, and the addition power on the overcorrection region 212 changes linearly with the change of x; at L6 corresponds to the fourth sub-positive addition region 2114, and the addition power A5(x) of the fourth sub-positive addition region 2114 corresponding to L6 all satisfies A2(x) ≥ 1.5 D, and the addition power on the fourth sub-positive addition region 2114 changes linearly with the change of x. According to the dioptric power at different positions, the radius of curvature of the peripheral defocus arc region 21 can be calculated, and then the structure of the second surface 2 can be obtained. Among them, between the fourth sub-positive addition region 2114 and the overcorrection region 212 can be a fourth transition region, and this fourth transition region has a certain addition power or does not have an addition power. In this example, in order to ensure the smoothness of the addition power curve, the fourth transition region is set as a curve with a changing addition power, which improves the visual effect when the user wears it.

[0087] The technical solution of the embodiment of the present utility model, by setting the overcorrection region and the fourth sub-positive addition region, makes the fourth sub-positive addition region surround the overcorrection region. Such a setting can not only ensure that the central focus of the object image falls on the center of the retina, but also ensure that the foci of other positions of the object image fall on the periphery of the retina, achieving the effect of peripheral myopic defocus. While ensuring that the user wears and sees clearly, it has a good effect of controlling myopia.

[0088] Optionally, Figure 6 is the second-angle structural schematic diagram of the third corneal reshaping lens provided according to the embodiment of the present utility model. Combining Figure 2 and Figure 6 shown, the corneal reshaping lens further includes a patterned structure 3;

[0089] The patterned structure 3 is provided on the second surface 2;

[0090] Or, the patterned structure 3 partially penetrates the corneal reshaping lens.

[0091] Among them, in the field of optics, the control principle of myopia can, on the one hand, utilize the generation of myopic defocus on the peripheral retina to control the growth of the eye axis; on the other hand, it can reduce the contrast of the peripheral retina imaging. Therefore, a patterned structure 3 is provided on the second surface 2 to enhance the scattering effect of the second surface 2, and thus play a role in reducing the peripheral retina contrast.

[0092] Specifically, the patterned structure 3 can be scattered dots, patterns or engraved lines. During the manufacturing process, scattered dots, patterns or engraved lines can be engraved on the second surface 2 by using the principle of laser engraving to increase the scattering of the second surface 2.

[0093] In some embodiments, the patterned structure 3 can also be disposed inside the orthokeratology lens, that is, between the first surface 1 and the second surface 2, and can also play a role in increasing scattering.

[0094] Optionally, the patterned structure 3 includes a third sub-region; the distance c from any position on the third sub-region to the center of the second surface satisfies 1.0 mm ≤ c ≤ 2.5 mm. That is, the patterned structure 3 is not located at the center of the second surface 2 so as not to affect the clear imaging of the user while increasing scattering.

[0095] Exemplarily, a pattern structure is engraved on the second surface 2 by laser. The distance from any point on the pattern structure to the center of the second surface 2 is between 1.0 mm and 2.5 mm, and the angle between the line connecting any point and the center point of the second surface 2 and the y direction is less than or equal to 15°. It can be understood that in order to ensure that the clear imaging of the user is not affected, the area of the patterned structure 3 should not be too large, and the distance from the center of the second surface 2 is between 1.0 mm and 2.5 mm.

[0096] In some embodiments, the patterned structure 3 can also include microlenses. The diameter of the microlenses is between 0.5 mm and 1.5 mm, the distance from each microlens to the center of the second surface 2 is between 1.5 mm and 2.5 mm, and the dioptric power addition of the microlenses is between -5D and -1D or between 1D and 5D, which plays a role in increasing the peripheral contrast.

[0097] The technical solution of the embodiment of the present utility model increases the scattering performance on the second surface by setting a patterned structure on the second surface, so that the user reduces the contrast of the peripheral retina imaging during imaging, and further improves the effect of controlling myopia.

[0098] The technical solution of the embodiment of the present utility model enables the user to also achieve the effect of peripheral myopic defocus during non-sleep wearing by setting a peripheral defocus arc area on the second surface, thereby making up for the problem that the effect of controlling myopia decreases when the user's sleep time is insufficient for the orthokeratology lens, and providing peripheral myopic defocus for an additional time. In addition, when the user wears the orthokeratology lens during non-sleep, the shaping time can be extended to a certain extent, and the effect of controlling myopia is improved.

[0099] The above specific embodiments do not constitute a limitation to the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A corneal reshaping lens, characterized in that: include: A first surface and a second surface disposed opposite to each other; The first surface includes a corneal shaping arc area, and the corneal shaping arc area is used to change the shape of the cornea when worn; The second surface includes a peripheral defocus arc area, and the peripheral defocus arc area is used to image the object on the side of the retina close to the first surface when worn.

2. The orthokeratology lens according to claim 1, characterized in that: The peripheral defocus arc area includes a light-added area and an over-correction area; The optical focal length of the light-added area is greater than the prescribed focal length; and the optical focal length of the overcorrected area is less than the prescribed focal length.

3. The orthokeratology lens according to claim 2, characterized in that: The light adding area includes a first sub-light adding area; The over-correction area surrounds the first sub-lightening area; The optical power P1 of the first sub-light-adding area and the prescription power P0 satisfy P1-P0≥+1.5D; The optical power P2 of the overcorrected area and the prescription power P0 satisfy -4D≤P2-P0≤-1D.

4. The orthokeratology lens according to claim 3, characterized in that: The light adding area further includes a second sub-light adding area and a third sub-light adding area; The second sub-light-adding area surrounds the over-correction area, and the third sub-light-adding area surrounds the second sub-light-adding area; The optical power P3 of the second sub-light-adding area and the prescription focal power P0 satisfy P3-P0≥+1D, and the optical power P4 of the third sub-light-adding area and the prescription focal power P0 satisfy P4-P0≥+2D.

5. The orthokeratology lens according to claim 2, characterized in that: The light adding area includes a fourth sub-light adding area; The fourth sub-lightening area surrounds the over-correction area; The optical power P5 of the fourth sub-light adding area and the prescription focal power P0 satisfy P5-P0≥+1.5D; The optical power P2 of the overcorrected area and the prescription power P0 satisfy -1D≤P2-P0≤0D.

6. The orthokeratology lens according to claim 3, characterized in that: The overcorrected area includes a first sub-area; The distance between any position on the first sub-region and the center of the second surface is 1.0 mm.

7. The orthokeratology lens according to claim 5, characterized in that: The fourth sub-light-adding area includes the second sub-area; A distance b between any position on the second sub-region and the center of the second surface satisfies 1.5 mm≤b≤2.5 mm.

8. The orthokeratology lens according to claim 1, characterized in that: The curvature radius R at a on the peripheral defocus arc area front (x) and the focal power P(x) at a satisfy: Wherein, x is the distance from point a to the center of the second surface; P(x) is the focal length at point a; R back (x) is the radius of curvature of the first surface corresponding to position a; n lens is the refractive index of the orthokeratology lens; n tear is the refractive index of tears; n cornea is the refractive index of the cornea.

9. The orthokeratology lens according to claim 1, characterized in that: The orthokeratology lens also includes a patterned structure; The patterned structure is disposed on the second surface; Alternatively, the patterned structure partially penetrates the orthokeratology lens.

10. The orthokeratology lens according to claim 9, characterized in that: The patterned structure includes a third sub-region; A distance c between any position on the third sub-region and the center of the second surface satisfies 1.0 mm≤c≤2.5 mm.

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