Asymmetrical orthokeratology lens

Abstract

To provide an asymmetrical orthokeratology lens that includes a base curve, and a reverse curve, an alignment curve, and a peripheral curve formed continuously from the periphery of the base curve toward the outside.SOLUTION: An outer edge of a base curve 1 is coupled to an outer edge of a reverse curve 2 to form a first ring structure. A space defined between a cornea and a half ring located on a nose side 6 in the first ring structure is larger than a space defined between the cornea and a half ring located on a side head side 5 in the first ring structure. When an orthokeratology lens is worn, the amount of tear fluid filling a space between the lens and the cornea thus becomes different between a nose side and a side head side of the reverse curve 2. This causes an imbalance in negative pressure formed between the nose side and the side head side, and as a result, a defocus ring closer to the nose side is formed as much as possible on the cornea, and thereby an effect to prevent and suppress myopia using the orthokeratology lens is effectively improved.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the technical field of orthokeratology lenses, and particularly to an asymmetric orthokeratology lens.

Background Art

[0002] Orthokeratology lenses have become one of the most widely used means for preventing and controlling myopia in the world due to their effectiveness and safety in preventing and controlling myopia. The mechanism of action of orthokeratology lenses is mainly as follows. That is, by wearing them during sleep for a long time, the lens continuously applies a positive pressure to the central region of the cornea. As a result, the original epithelial cells in the central region of the cornea are moved to the periphery, forming a relatively flat treatment region in the center and a relatively raised defocus ring in the periphery. When the defocus ring is formed, the retina in the central peripheral part is in a myopic defocus state, so the elongation of the eye axis is suppressed and the progression of myopia is delayed.

[0003] Generally, conventional orthokeratology lenses include four curves: a base curve, a reverse curve, an alignment curve, and a peripheral curve. When viewed from a plan view of the lens, the base curve is a circular region, and the remaining three curves are ring-shaped regions with equal widths. When such a lens is positioned at the center of the cornea and exhibits a good shaping effect, theoretically, a defocus ring centered on the center of the cornea is formed. The defocus amount generated by such a defocus ring on the retina in the central peripheral part is relatively uniform, and the maximum peripheral defocus amount on the axis is small, so effective prevention and control of myopia cannot be achieved.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Based on this point, the object of the present invention is to provide an asymmetric orthokeratology lens for solving the technical problems presented in the above background art.

Means for Solving the Problem

[0005] The present invention provides an asymmetric orthokeratology lens including a base curve, a reverse curve, an alignment curve, and a peripheral curve that are continuously formed outward from the periphery of the base curve. The outer edge of the base curve is joined to the outer edge of the reverse curve to form a first annular structure. The space defined between the half-ring located on the nasal side of the first annular structure and the cornea is larger than the space defined between the half-ring located on the temporal side of the first annular structure and the cornea.

[0006] Furthermore, in the asymmetric orthokeratology lens, the outer edges of the base curve, the alignment curve, and the peripheral curve are all circular, and the centers of these circles overlap. The center point of the outer edge of the reverse curve is provided offset in the nasal direction with respect to the center of the base curve so that the width on the nasal side of the first annular structure is larger than the width on the temporal side.

[0007] Furthermore, in the asymmetric orthokeratology lens, the outer edge of the reverse curve is circular or elliptical.

[0008] Furthermore, in the asymmetric orthokeratology lens, the outer edges of the base curve, the alignment curve, and the peripheral curve are all circular, and the centers of these circles overlap. The outer edge of the reverse curve is surrounded by a semi-circular arc and a semi-elliptical arc. The center of the semi-circular arc and the center point of the semi-elliptical arc both overlap with the center of the base curve. The semi-circular arc surrounds the side of the base curve facing the temporal side, and the semi-elliptical arc surrounds the side of the base curve facing the nasal side. The distance from a point on the semi-elliptical arc to the center of the base curve is greater than or equal to the distance from a point on the semi-circular arc to the center of the base curve so that the width on the nasal side of the first annular structure is larger than the width on the temporal side.

[0009] Furthermore, in the asymmetric orthokeratology lens, the outer edges of the reverse curve, alignment curve, and peripheral curve are all circular, and their centers overlap. The outer edge of the base curve is surrounded by a semicircular arc and a semi-elliptical arc. The centers of the semicircular arcs and the central point of the semi-elliptical arcs all overlap with the center of the reverse curve. The semicircular arcs are arranged to face the temporal side, and the semi-elliptical arcs are arranged to face the nasal side. The distance from a point on the semi-elliptical arc to the center of the reverse curve is equal to or less than the distance from a point on the semicircular arc to the center of the reverse curve, so that the width of the nasal side of the first annular structure is greater than the width of the temporal side.

[0010] Furthermore, in the asymmetric orthokeratology lens, the inner surface of the base curve is flat. The reverse curve includes a first curve and a second curve formed by continuously curving outward from the periphery of the base curve. The curvature of the inner surface of the first curve is equal to or less than the curvature of the inner surface of the second curve.

[0011] Furthermore, in the asymmetric orthokeratology lens, the arrow heights from the points on the outer edge of the first curve to the base curve are all equal.

[0012] Furthermore, in the asymmetric orthokeratology lens, the distance from the outer edge of the first curve in the temporal direction to the base curve is equal to the distance from the outer edge in the nasal direction to the base curve.

[0013] The distance from the outer edge of the second curve in the temporal direction to the first curve is smaller than the distance from the outer edge in the nasal direction to the first curve.

[0014] Furthermore, in the asymmetric orthokeratology lens, if the distance from the outer edge in the temporal direction to the first curve of the second curve is X1, and the distance from the outer edge in the nasal direction to the first curve of the second curve is X2, the difference between X2 and X1 is 0.1 to 0.4 mm.

[0015] Furthermore, in the asymmetric orthokeratology lens, if the distance from the outer edge in the temporal direction to the base curve of the first curve is X3, the ratio of X3 to X1 is 1 / 3.

[0016] Furthermore, in the asymmetric orthokeratology lens, the outer edges of the base curve, reverse curve, alignment curve, and peripheral curve are all circular, and the centers of these circles overlap, so that the first annular structure forms an annulus. The curvature of the nasal inner surface of the annulus is greater than the curvature of the temporal inner surface.

[0017] Furthermore, in the asymmetric orthokeratology lens, the inner surface of the base curve is a flat surface. The reverse curve includes a first curve and a second curve that are continuously curved outward from the periphery of the base curve. The curvature of the nasal inner surface of the first curve is equal to the curvature of the temporal inner surface, and the curvature of the nasal inner surface of the second curve is greater than the curvature of the temporal inner surface.

Advantages of the Invention

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0019] The space defined between the half-ring located on the nasal side of the first annular structure and the cornea is larger than the space defined between the half-ring located on the temporal side of the first annular structure and the cornea. Therefore, when an orthokeratology lens is worn, the amount of tear fluid filled between the cornea and the nasal side and the temporal side of the reverse curve is different. As a result, the negative pressures formed on the nasal side and the temporal side become unbalanced, and a defocus ring closer to the nasal side is formed on the cornea as much as possible. Thus, the effect of preventing and suppressing myopia by the orthokeratology lens is effectively improved.

[0020] The above and / or additional aspects and advantages in the present invention will become apparent and be easily understood from the description of the embodiments in combination with the following drawings.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0022] To facilitate understanding of the present invention, the present invention will now be described more fully hereinafter with reference to the associated drawings, in which several embodiments of the present invention are shown. However, the present invention may be embodied in many different forms and is not limited to the embodiments set forth herein. Rather, these embodiments are provided to make the disclosure of the present invention clearer and more comprehensive.

[0023] It should be understood that when an element is described as being "fixed" to another element, it may be directly on the other element or there may be intervening elements. Also, when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be intervening elements. Additionally, the terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for descriptive purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. In addition, the terms used in the present specification are intended to describe specific examples only and are not intended to limit the present invention. In addition, the term "and / or" used in the present specification includes any and all combinations of one or more related listed items.

[0025] First Example

[0026] 1 and 3, an asymmetric orthokeratology lens according to a first embodiment of the present invention includes a base curve 1, a reverse curve 2, an alignment curve 3, and a peripheral curve 4, which are continuously formed from the periphery of the base curve 1 outward. The outer edge of the reverse curve 2 is joined to the outer edge of the base curve 1 to form a first annular structure. The space defined between the half annulus located on the nasal side 6 of the first annular structure and the cornea 7 is larger than the space defined between the half annulus located on the temporal side 5 of the first annular structure and the cornea 7.

[0027] As can be seen, the space defined between the cornea 7 and the half of the first annular structure located on the nasal side 6 is larger than the space defined between the cornea 7 and the half of the first annular structure located on the temporal side 5, so when an orthokeratology lens is worn, the amount of tear fluid filling between the cornea 7 and the nasal side and the temporal side of the reverse curve 2 will differ. This causes an imbalance in the negative pressure formed on the nasal side and the temporal side, resulting in the formation of a defocus ring as close to the nasal side 6 as possible on the cornea 7, thereby effectively improving the orthokeratology lens's effect in preventing and suppressing myopia.

[0028] Specifically, referring to Fig. 1, the outer edges of the base curve 1, alignment curve 3, and peripheral curve 4 are all circular, and their centers overlap. The center point of the outer edge of the reverse curve 2 is shifted toward the nose side 6 from the center of the base curve 1 as a reference point, so that the width of the nose side 6 of the first annular structure is greater than the width of the temporal side 5. The outer edge of the reverse curve 2 is elliptical. In Fig. 1, the symbol + indicates the center of the base curve 1, and the symbol × indicates the center point of the reverse curve 2.

[0029] As can be seen, the center point of the outer edge of the reverse curve 2 is shifted toward the nasal side 6 from the center of the base curve 1 as a reference point, so that the projected area of the half of the first annular structure located on the nasal side 6 on the cornea 7 is larger than the projected area of the half of the first annular structure located on the temporal side 5 on the cornea 7. As a result, the space defined between the half of the first annular structure located on the nasal side 6 and the cornea 7 is larger than the space defined between the half of the first annular structure located on the temporal side 5 and the cornea 7. As a result, it is ensured that the amount of tear fluid filling between the cornea 7 and the nasal side and the temporal side of the reverse curve 2 is different, resulting in an imbalance in the negative pressure formed on the nasal side and the temporal side. By optimizing the filling of tear fluid and the distribution of the acting force, a defocus ring is formed on the cornea 7 closer to the nasal side 6, thereby improving the orthokeratology lens's effect in preventing and suppressing myopia.

[0030] In addition, the outer edge shape of the reverse curve 2 may be circular, as shown in Fig. 2. Note that this embodiment is merely an example and is not intended to be limiting, and may be specifically adjusted according to actual needs.

[0031] It is worth noting that the outer edge of the reverse curve 2 is connected to the outer edge of the alignment curve 3 to form a second annular structure. The center point of the outer edge of the reverse curve 2 is shifted toward the nasal side 6, so that the width of the nasal side 6 of the second annular structure is smaller than the width of the temporal side 5.

[0032] Further, refer to Figure 3. The inner surface of the base curve 1 is a flat surface and is used to achieve vision correction by flattening the center of the cornea 7. The reverse curve 2 includes a first curve 21 and a second curve 22 that are formed by continuously curving outward from the periphery of the base curve 1. The curvature of the inner surface of the first curve 21 is equal to or less than the curvature of the inner surface of the second curve 22.

[0033] It should be noted that the distance from a point on the outer edge of the second curve 22 to a point on the outer edge of the first curve 21 is not a fixed value, and therefore the circumferential curvature of the inner surface of the second curve 22 varies within a certain range of values as the angle changes. Specifically, in this embodiment, when a cross section of the cornea 7 is cut at the flattest half-axis based on the topography of the cornea 7, the curvature of the inner surface of the first curve 21 is equal to the curvature of the inner surface of the second curve 22. As a result, the curvatures of the inner surface of the first curve 21 in the cross sections of the remaining half-axis may all be smaller than the curvature of the inner surface of the second curve 22. Specifically, see FIG. 3 , which shows a cross section of the cornea 7 at a half-axis other than the flattest half-axis. As can be seen from the drawing, the inner surface of the first curve 21 is flatter than the second curve 22. This is to smooth the curvature transition between the base curve 1 and the second curve 22, thereby enhancing the pressure resistance of the lens. This effectively alleviates the situation where the boundary between the base curve 1 and the reverse curve 2 bends inward at a large angle, making the lens more susceptible to breakage or deformation, thereby improving the safety and durability of wearing the lens.

[0034] Continuing with reference to FIG. 3 , the arrow heights from points on the outer edge of the first curve 21 to the base curve 1 are all equal. This means that the circumferential curvature of the inner surface of the first curve 21 is fixed. Therefore, the arrow height from the inner surface of the outer edge of the first curve 21 to the apex of the lens in the cross section of the flattest half axis is equal to the arrow height from the inner surface of the outer edge of the first curve 21 to the apex of the lens in the cross section of the remaining half axis. This ensures that the reverse curve 2 can store a sufficient amount of tear fluid and generate a sufficiently large negative pressure, thereby forming a defocus ring with a larger defocus amount on the cornea 7. This defocus ring has a better effect on preventing and suppressing myopia because it can generate a defocus effect over a wider area of the cornea 7 and suppress axial elongation, thereby slowing the progression of myopia.

[0035] As shown in Fig. 3, the distance from the outer edge of the first curve 21 in the direction of the temporal side 5 to the base curve 1 is equal to the distance from the outer edge in the direction of the nasal side 6 to the base curve 1. Specifically, in this embodiment, the outer edge of the first curve 21 is a circle whose center overlaps with the center of the base curve 1. The outer edge of the first curve 21 is joined to the outer edge of the base curve 1 to form a ring. The widths of the ring on the nasal side 6 and the temporal side 5 are both equal.

[0036] The distance from the outer edge of the second curve 22 in the direction of the temporal side 5 to the first curve 21 is smaller than the distance from the outer edge in the direction of the nasal side 6 to the first curve 21. As can be understood, in this embodiment, the outer edge of the second curve 22 is the outer edge of the reverse curve 2. Therefore, the distance from the outer edge of the second curve 22 in the direction of the nasal side 6 to the first curve 21 is wider than the distance from the outer edge in the direction of the temporal side 5 to the first curve 21, and the value of the curvature is smaller. As a result, the filling of the tear fluid between the reverse curve 2 and the cornea 7 becomes different between the nasal side 6 and the temporal side 5, so the relative negative pressures formed on the nasal side 6 and the temporal side 5 are also different. By doing so, the flattening of the center of the cornea 7 is promoted, and the relative bulges formed on the nasal side 6 and the temporal side 5 also become different, and an asymmetric defocus ring is formed on the periphery of the cornea 7. Therefore, the maximum peripheral defocus rate is improved, and the preventive and inhibitory effects of myopia become more ideal.

[0037] Notably, the outer edge of the first curve 21 is joined to the outer edge of the base curve 1 to form an annulus. Such a design aims to make the transition between the first curve 21 and the base curve 1 smoother and ensure the uniformity of the pressure distribution applied from the lens to the cornea 7. By making such a smooth transition, the lens can better adhere to the change in the curvature of the cornea 7, so the fit and stability are improved. Also, such an annulus design contributes to ensuring that the circumferential curvature on the inner surface of the first curve 21 becomes a fixed value. Thereby, the first curve 21 can apply uniform pressure in each direction. By ensuring the uniformity of the curvature on the inner surface of the first curve 21, the risk of the force applied to the cornea 7 becoming non-uniform can be reduced, and the comfort and safety of wearing are improved.

[0038] Furthermore, in actual application, the size design of the reverse curve 2 is important in terms of the myopia prevention and control effect, improved fit and stability, and enhanced safety. In this regard, in this embodiment, the following size design requirements are required for the reverse curve 2. Specifically, as shown in FIG. 3 , if the distance from the outer edge of the second curve 22 in the direction toward the temporal side 5 to the first curve 21 is X1, and the distance from the outer edge of the second curve 22 in the direction toward the nasal side 6 to the first curve 21 is X2, the difference between X2 and X1 is controlled to be 0.1 to 0.4 mm. This allows for better adaptation to differences in the shape of the cornea 7 among individuals, improving the fit and stability of the lens and better achieving cornea 7 shaping and myopia prevention and control effects.

[0039] Furthermore, if the distance from the outer edge of the first curve 21 in the direction toward the temporal side 5 to the base curve 1 is designated as X3, the ratio of X3 to X1 is 1 / 3. This design contributes to balancing the distribution of tears between the lens and the cornea 7, thereby reducing the influence of tear flow on the molding effect and improving the stability of the lens.

[0040] 3, the alignment curve 3 includes a third curve 31 and a fourth curve 32 that are continuously curved outward from the periphery of the second curve 22, and these curves are combined to form the second annular structure. The curvature of the inner surface of the fourth curve 32 is smaller than the curvature of the inner surface of the third curve 31 in the entire circumferential direction of the second annular structure. This makes the fourth curve 32 flatter than the third curve 31, and it adapts to the irregular surface of the cornea 7, improving the positioning accuracy and the stability of the lens.

[0041] Furthermore, the outer edge of the peripheral curve 4 forms an inverted hook portion by curving away from the cornea 7. The inverted hook portion effectively guides the flow of tears along itself, maintaining smooth tear circulation and reducing discomfort for the wearer. It also allows air to easily pass through the gap between the lens and the cornea 7, improving the oxygen permeability of the lens.

[0042] It should be noted that in this embodiment, the inner surfaces of the first curve 21, the second curve 22, the third curve 31 and the fourth curve 32 are connected to form a smooth curved surface, which facilitates processing and production and improves comfort and safety when worn.

[0043] As described above, in the asymmetric orthokeratology lens of the above embodiment of the present invention, the space defined between the cornea 7 and the half of the first annular structure located on the nasal side 6 is larger than the space defined between the cornea 7 and the half of the first annular structure located on the temporal side 5. Therefore, when the orthokeratology lens is worn, the amount of tear fluid filling between the cornea 7 and the nasal side and the temporal side of the reverse curve 2 differs. This causes an imbalance in the negative pressure formed on the nasal side and the temporal side, resulting in the formation of a defocus ring as close to the nasal side 6 as possible on the cornea 7, thereby effectively improving the orthokeratology lens's effect in preventing and suppressing myopia.

[0044] Second Example

[0045] Referring to FIG. 4 , which shows an asymmetric orthokeratology lens according to a second embodiment of the present invention, the differences between the asymmetric orthokeratology lens of this embodiment and the asymmetric orthokeratology lens of the first embodiment are as follows: The outer edges of the base curve 1, alignment curve 3, and peripheral curve 4 are all circular, and their centers overlap. The outer edge of the reverse curve 2 is surrounded by a semicircular arc and a semi-elliptical arc. The centers of the semicircular arc and the central point of the semi-elliptical arc all overlap with the center of the base curve 1. The semicircular arc surrounds the side of the base curve 1 facing the temporal side 5, and the semi-elliptical arc surrounds the side of the base curve 1 facing the nasal side 6. The distance from a point on the semi-elliptical arc to the center of the base curve 1 is equal to or greater than the distance from a point on the semi-elliptical arc to the center of the base curve 1 so that the width of the nasal side 6 of the first annular structure is greater than the width of the temporal side 5.

[0046] As can be seen, the semicircular arc is connected to the outer edge of the base curve 1 in the direction of the temporal side 5 to form one half of the first annular structure, and the semi-elliptical arc is connected to the outer edge of the base curve 1 in the direction of the nasal side 6 to form the other half of the first annular structure. Compared to the first embodiment, in which the center point of the outer edge of the reverse curve 2 is shifted to form the first annular structure, the semicircular arc can be connected to the outer edge of the base curve 1 to form a semicircular annular structure of equal width. This can unbalance the negative pressure created by the reverse curve 2 between the nasal and temporal sides and the cornea 7, while more uniformly distributing the tear fluid that fills between the temporal side 5 and the cornea 7. This design reduces the possibility of tear stagnation and promotes smooth tear circulation, improving wearing comfort.

[0047] Third Example

[0048] FIG. 5 shows an asymmetric orthokeratology lens according to a third embodiment of the present invention. The differences between the asymmetric orthokeratology lens of this embodiment and the asymmetric orthokeratology lens of the first embodiment are as follows: The outer edges of the reverse curve 2, alignment curve 3, and peripheral curve 4 are all circular, and their centers overlap. The outer edge of the base curve 1 is surrounded by a semicircular arc and a semi-elliptical arc. The centers of the semicircular arcs and the central points of the semi-elliptical arcs all overlap with the center of the reverse curve 2. The semicircular arcs are oriented toward the temporal side 5, and the semi-elliptical arcs are oriented toward the nasal side 6. The distance from a point on the semi-elliptical arc to the center of the reverse curve 2 is equal to or less than the distance from a point on the semi-elliptical arc to the center of the reverse curve 2, so that the width of the nasal side 6 of the first annular structure is greater than the width of the temporal side 5. It should be noted that this embodiment is a modification implemented based on the second embodiment, and can achieve the same technical effects as the second embodiment, so it will not be described in further detail.

[0049] Fourth Example

[0050] 6 and 7 show an asymmetric orthokeratology lens according to a fourth embodiment of the present invention. The differences between the asymmetric orthokeratology lens of this embodiment and the asymmetric orthokeratology lens of the first embodiment are as follows: The outer edges of the base curve 1, reverse curve 2, alignment curve 3, and peripheral curve 4 are all circular, and the centers of these circles overlap to form a ring in the first annular structure. The curvature of the inner surface of the nasal side 6 of the ring is greater than the curvature of the inner surface of the temporal side 5.

[0051] As can be seen, because the first annular structure is a circular ring, the widths of all angles in the circumferential direction are equal. Assuming the widths are equal, the curvature of the inner surface of the half of the ring located on the nasal side 6 is increased, making the inner surface of the first annular structure on the nasal side 6 steeper than the inner surface of the half of the ring located on the temporal side 5. This makes the space defined between the half of the first annular structure located on the nasal side 6 and the cornea 7 larger than the space defined between the half of the first annular structure located on the temporal side 5 and the cornea 7. This reliably ensures that the amount of tear fluid filling between the cornea 7 and the nasal and temporal sides of the reverse curve 2 is different. This creates an imbalance in the negative pressure formed on the nasal and temporal sides, and forms a defocus ring on the cornea 7 closer to the nasal side 6 as much as possible, thereby effectively improving the orthokeratology lens's effect in preventing and suppressing myopia.

[0052] Specifically, as shown in Figure 7, the inner surface of the base curve 1 is a flat surface. The reverse curve 2 includes a first curve 21 and a second curve 22 that are formed by continuously curving outward from the periphery of the base curve 1. The curvature of the inner surface of the nasal side 6 of the first curve 21 is equal to the curvature of the inner surface of the temporal side 5. Furthermore, the curvature of the inner surface of the nasal side 6 of the second curve 22 is greater than the curvature of the inner surface of the temporal side 5.

[0053] As can be seen, the curvatures of the inner surfaces of the nasal side 6 and the temporal side 5 of the first curve 21 are equal. This allows the first curve 21 to be in relatively stable contact with the cornea 7 by matching the curvatures to the base curve 1, providing the desired support and ensuring uniform distribution of tears.

[0054] The curvature of the inner surface of the nasal side 6 of the second curve 22 is greater than the curvature of the inner surface of the temporal side 5. This design creates an imbalance in the forces acting between the nasal side 6 and the temporal side 5 of the second curve 22 and the cornea 7, thereby affecting the distribution and circulation of tears. Adjusting the curvature of the second curve 22 makes it possible to further optimize the filling of tears and the distribution of the forces acting thereon, thereby improving the effectiveness in preventing and suppressing myopia.

[0055] In the description of this specification, the terms such as "one embodiment", "several embodiments", "illustration", "specific illustration", or "several illustrations" mean that the specific features, structures, materials, or characteristics described by combining the embodiments or illustrations are included in at least one embodiment or illustration of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily indicate the same embodiment or illustration. Moreover, the specific features, structures, materials, or characteristics described can be combined in an appropriate manner in any one or more embodiments or illustrations.

[0056] The embodiments described above merely show some embodiments of the present invention and are described relatively specifically and in detail, but it should not be construed that the scope of the rights of the present invention is limited thereby. It should be pointed out that those skilled in the art can also make some modifications and improvements on the premise of not departing from the concept of the present invention, and all of these belong to the scope of protection of the present invention. Therefore, the scope of protection of the patent of the present invention shall be subject to the appended claims.

Explanation of Reference Signs

[0057] 1 Base curve 2 Reverse curve 21 First curve 22 Second curve 3 Alignment curve 31 Third curve 32 Fourth curve 4 Peripheral curve 5 Temporal side 6 Nasal side 7 Cornea

Claims

1. An asymmetric orthokeratology lens including a base curve and a reverse curve, an alignment curve, and a peripheral curve that are continuously formed outward from the periphery of the base curve, wherein an outer edge of the base curve is joined to an outer edge of the reverse curve to form a first annular structure, and a space defined between a half ring located on the nasal side of the first annular structure and the cornea is larger than a space defined between a half ring located on the temporal side of the first annular structure and the cornea. The asymmetric orthokeratology lens is characterized by this.

2. The outer edges of the base curve, the alignment curve, and the peripheral curve are all circular, and the centers of these circles overlap. The center point of the outer edge of the reverse curve is provided shifted in the nasal direction with reference to the center of the base curve so that the width of the nasal side of the first annular structure is larger than the width of the temporal side. The asymmetric orthokeratology lens according to Claim 1 is characterized by this.

3. The outer edge of the reverse curve is circular or elliptical. The asymmetric orthokeratology lens according to Claim 2 is characterized by this.

4. The outer edges of the base curve, the alignment curve, and the peripheral curve are all circular, and the centers of these circles overlap. The outer edge of the reverse curve is surrounded by a semi-circular arc and a semi-elliptical arc. The center of the semi-circular arc and the center point of the semi-elliptical arc both overlap with the center of the base curve. The semi-circular arc surrounds the side of the base curve facing the temporal side, and the semi-elliptical arc surrounds the side of the base curve facing the nasal side. The distance from a point on the semi-elliptical arc to the center of the base curve is greater than or equal to the distance from a point on the semi-circular arc to the center of the base curve so that the width of the nasal side of the first annular structure is larger than the width of the temporal side. The asymmetric orthokeratology lens according to Claim 1 is characterized by this.

5. The outer edges of the reverse curve, alignment curve, and peripheral curve are all circular, and their centers coincide. The outer edge of the base curve is surrounded by a semi-circular arc and a semi-elliptical arc. The center of the semi-circular arc and the center point of the semi-elliptical arc both coincide with the center of the reverse curve. The semi-circular arc is provided to face the temporal side, and the semi-elliptical arc is provided to face the nasal side. The distance from a point on the semi-elliptical arc to the center of the reverse curve is less than or equal to the distance from a point on the semi-circular arc to the center of the reverse curve, so that the width of the nasal side of the first annular structure is larger than the width of the temporal side. The asymmetric orthokeratology lens according to claim 1, characterized in that.

6. The inner surface of the base curve is a flat surface. The reverse curve includes a first curve and a second curve that are continuously curved outward from the periphery of the base curve. The curvature of the inner surface of the first curve is less than or equal to the curvature of the inner surface of the second curve. The asymmetric orthokeratology lens according to any one of claims 1 to 5, characterized in that.

7. The sagittal height values from a point on the outer edge of the first curve to the base curve are all equal. The asymmetric orthokeratology lens according to claim 6, characterized in that.

8. The distance from the outer edge in the temporal side direction of the first curve to the base curve is equal to the distance from the outer edge in the nasal side direction to the base curve. The distance from the outer edge in the temporal side direction of the second curve to the first curve is smaller than the distance from the outer edge in the nasal side direction to the first curve. The asymmetric orthokeratology lens according to claim 6, characterized in that.

9. When the distance from the outer edge in the temporal side direction of the second curve to the first curve is X1, and the distance from the outer edge in the nasal side direction of the second curve to the first curve is X2, the difference between X2 and X1 is 0.1 to 0.4 mm. The asymmetric orthokeratology lens according to claim 8, characterized in that.

10. When the distance from the outer edge in the temporal side direction of the first curve to the base curve is X3, the ratio of X3 to X1 is 1 / 3. The asymmetric orthokeratology lens according to claim 9, characterized in that.

11. The outer edges of the base curve, reverse curve, alignment curve, and peripheral curve are all circular, and the centers of these circles overlap, so that the first annular structure forms an annular ring. The curvature of the inner surface on the nasal side in the annular ring is greater than the curvature of the inner surface on the temporal side. The asymmetric orthokeratology lens according to claim 1, characterized in that.

12. The inner surface of the base curve is a flat surface. The reverse curve includes a first curve and a second curve that are continuously curved outward from the periphery of the base curve. The curvature of the inner surface on the nasal side in the first curve is equal to the curvature of the inner surface on the temporal side, and the curvature of the inner surface on the nasal side in the second curve is greater than the curvature of the inner surface on the temporal side. The asymmetric orthokeratology lens according to claim 11, characterized in that.

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