Non-meridian asymmetric orthokeratology lens

Abstract

The utility model discloses a non-meridian asymmetric orthokeratology lens, which relates to the field of orthokeratology lens design, and adopts the technical scheme that the non-meridian asymmetric orthokeratology lens comprises a circular arc sheet-shaped lens body, and the lens body comprises a base arc area, a reverse arc area, a positioning arc area and a side arc area which are integrally formed from inside to outside, the positioning arc area is divided into a first area, a second area, a third area and a fourth area by four area dividing lines, the intersection point of the four area dividing lines is located at the circle center of the base arc area, and the four area dividing lines comprise at least two meridian lines and at least one oblique crossing line. Due to the fact that the oblique intersecting lines are arranged, the areas of the first area, the second area, the third area and the fourth area are different, namely the areas are in the non-equal division state, the problem that asymmetric corneal astigmatism exists in the corneas of most people can be solved, the lens can be better matched with the cornea of a patient, the lens deviation symptom is avoided, and the lens can be used for improving the lens quality. The teenager vision correction effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of orthokeratology lens design, and more specifically, it relates to a non-meridian asymmetric orthokeratology lens. Background Technology

[0002] Orthokeratology (Ortho-k) is a non-surgical procedure that involves wearing a specially designed rigid corneal reshaping lens (usually a four-zone, five-curve design). This lens gradually flattens the central cornea, reducing its refractive power and thus lowering myopia and improving uncorrected visual acuity. For corneal astigmatism, a toric design is primarily used, ensuring the lens is more precisely positioned along the two principal meridians to better fit the cornea.

[0003] Orthokeratology lenses typically determine their parameters based on the morphology of the anterior corneal surface, which can be precisely, systematically, and comprehensively measured using a corneal topography instrument. Among the common corneal topography patterns in normal individuals, the most prevalent is the asymmetrical bowtie shape, indicating that most people have asymmetrical corneal astigmatism (the astigmatic axis falls off a non-meridian line, and the curvature is asymmetrical). Current toroidal lenses are designed according to meridian and curvature symmetry. Therefore, wearing existing toroidal lenses with toroidal designs cannot properly fit the cornea, resulting in lens misalignment. This is a reason for the unsatisfactory correction and myopia control effects in adolescents. Utility Model Content

[0004] The purpose of this invention is to provide a non-meridian asymmetric corneal reshaping lens to solve the above-mentioned problems. It breaks through the traditional toroidal design and adopts a non-meridian asymmetric curvature design in the positioning arc area, thereby achieving lens fit to the cornea and making the reshaping lens more suitable.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a non-meridian asymmetric corneal reshaping lens, comprising a circular arc-shaped lens body, the lens body comprising an integrally formed base arc region, a reverse arc region, a positioning arc region and a peripheral arc region from the inside out, the positioning arc region being divided into a first region, a second region, a third region and a fourth region by four dividing lines, the intersection of the four dividing lines being located at the center of the base arc region, and the four dividing lines including at least two meridians and at least one oblique line.

[0006] Preferably, the four dividing lines are divided into a first horizontal meridian, an oblique line, a second horizontal meridian, and a vertical meridian, and the angle between the oblique line and the first horizontal meridian is 75 degrees to 105 degrees and not equal to 90 degrees.

[0007] Preferably, the curvature of the first region decreases uniformly from the edge where the oblique line is located to the edge where the first horizontal meridian is located; the curvature of the second region decreases uniformly from the edge where the oblique line is located to the edge where the second horizontal meridian is located; the curvature of the third region increases uniformly from the edge where the second horizontal meridian is located to the edge where the vertical meridian is located; and the curvature of the fourth region increases uniformly from the edge where the first horizontal meridian is located to the edge where the vertical meridian is located.

[0008] Preferably, the four dividing lines are divided into a first horizontal meridian, a first oblique line, a second horizontal meridian, and a second oblique line. The angle between the first oblique line and the first horizontal meridian is 75 degrees to 105 degrees and not equal to 90 degrees, and the angle between the second oblique line and the first horizontal meridian is 75 degrees to 105 degrees and not equal to 90 degrees.

[0009] Preferably, the curvature of the first region decreases uniformly from the edge where the first oblique line is located to the edge where the first horizontal meridian is located; the curvature of the second region decreases uniformly from the edge where the first oblique line is located to the edge where the second horizontal meridian is located; the curvature of the third region increases uniformly from the edge where the second horizontal meridian is located to the edge where the second oblique line is located; and the curvature of the fourth region increases uniformly from the edge where the first horizontal meridian is located to the edge where the second oblique line is located.

[0010] Preferably, the inner surfaces of the first region, the second region, the third region, and the fourth region are connected to form a smooth curved surface.

[0011] Preferably, the positioning arc is divided into a first arc segment and a second arc segment, the second arc segment surrounds the outer edge of the first arc segment, and the curvature of the first arc segment is greater than the curvature of the second arc segment.

[0012] In summary, this utility model has the following beneficial effects:

[0013] This invention, by setting oblique lines, makes the areas of the four regions—the first, second, third, and fourth regions—different, i.e., non-equal divisions. This can solve the problem of asymmetrical corneal astigmatism in most people's corneas, thereby better adapting to the patient's cornea, avoiding lens deviation symptoms, and improving the vision correction effect for teenagers.

[0014] This invention, by controlling the angle of the oblique line, can better fit the patient's cornea, which is conducive to precise personalized customization for different patients, further improving its fit with the cornea, effectively preventing lens displacement, and improving safety of use.

[0015] This invention connects a flatter second arc segment to the outer edge of the first arc segment, which allows the starting point of the arc segment to be closer to the cornea, thereby achieving better arc segment closure and increasing the positioning effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0017] Figure 2 This is a structural schematic diagram of Embodiment 2 of the present invention.

[0018] Attached reference numerals: 1. Base arc region; 2. Reversal arc region; 3. Positioning arc region; 31. First region; 32. Second region; 33. Third region; 34. Fourth region; 35. First arc segment; 36. Second arc segment; 4. Side arc region; 5. First horizontal meridian; 6. Oblique line; 7. Second horizontal meridian; 8. Vertical meridian; 9. First oblique line; 10. Second oblique line. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1: As Figure 1As shown, a non-meridian asymmetric orthokeratology lens includes a lens body, which is generally circularly arc-shaped. The lens body comprises an integrally formed base curve region 1, a reversal curve region 2, a positioning curve region 3, and a peripheral curve region 4, formed from the inside out. The base curve region 1 is located at the center of the lens body and is circularly arc-shaped. The base curve region 1 is relatively flat to flatten the corneal surface, reducing the radius of curvature of the central corneal region, thereby achieving the result of myopia correction. The reversal curve region 2 surrounds the outer edge of the base curve region 1 and is annular. The reversal curve region 2 is relatively steep to stabilize the flattening effect of the base curve region 1, that is, to compensate for the change in sagittal depth caused by the difference in curvature between the base curve region 1 and the central corneal region. This allows the lens to form a tear pool on the cornea. The tear pool plays a lubricating and buffering role between the lens and the cornea, while the reversal curve region... Arc 2 also helps to collect tears, making the flattening effect of the central lens on the corneal surface more uniform and effective, improving lens comfort and enhancing the corrective effect. Positioning arc 3 surrounds the outer edge of reversal arc 2. Positioning arc 3 is flatter than reversal arc 2 but more curved than base arc 1. Positioning arc 3 is mainly used to stabilize the position of the lens and prevent the lens from shifting or falling out during wearing. The width of positioning arc 3 is greater than the width of reversal arc 2. Edge arc 4 surrounds the outer edge of positioning arc 3. Edge arc 4 is used to guide tears into the space between the lens and the cornea to form a tear circulation, which helps to keep the lens clean and moist. At the same time, it can also provide additional support, making the lens fit more stably on the cornea and reducing the pressure of the lens on the edge of the cornea, thus improving wearing comfort.

[0021] Furthermore, the positioning arc zone 3 is divided into four regions: a first region 31, a second region 32, a third region 33, and a fourth region 34. This can improve the situation of poor lens positioning caused by irregularities on the corneal surface, improve lens stability, enhance fitting effect, and strengthen correction effect. The intersection of the four dividing lines is located at the center of the base arc zone 1, and the four dividing lines include at least two meridians and at least one oblique line 6. Due to the setting of the oblique line 6, the areas of the four regions, namely the first region 31, the second region 32, the third region 33, and the fourth region 34, are different, i.e., they are not equally divided. This can solve the problem of asymmetrical corneal astigmatism in most people's corneas, thereby better fitting the patient's cornea, avoiding lens deviation symptoms, and improving the vision correction effect for adolescents.

[0022] The four dividing lines are: the first horizontal meridian 5, the oblique line 6, the second horizontal meridian 7, and the vertical meridian 8. The angle between the oblique line 6 and the first horizontal meridian 5 is 75-105 degrees, but not equal to 90 degrees. Controlling the angle of the oblique line 6 allows for a better fit to the patient's cornea, facilitating precise personalized customization for different patients, further improving the fit to the cornea, effectively preventing lens displacement, and enhancing safety. Furthermore, the first region 31 and the second region 32 are divided by the oblique line 6, with a gradual transition between them. Regions 32 and 33 are divided by the second horizontal meridian 7, and are gradually connected. Regions 33 and 34 are divided by the vertical meridian 8, and are gradually connected. Regions 34 and 31 are divided by the first horizontal meridian 5, and are gradually connected. Thus, the inner surfaces of regions 31, 32, 33 and 34 are connected to form a smooth curved surface, ensuring a natural connection between the regions and improving the lens's performance.

[0023] Furthermore, the curvature of the first region 31 decreases uniformly from the edge where the oblique line 6 is located to the edge where the first horizontal meridian 5 is located; the curvature of the second region 32 decreases uniformly from the edge where the oblique line 6 is located to the edge where the second horizontal meridian 7 is located; the curvature of the third region 33 increases uniformly from the edge where the second horizontal meridian 7 is located to the edge where the vertical meridian 8 is located; and the curvature of the fourth region 34 increases uniformly from the edge where the first horizontal meridian 5 is located to the edge where the vertical meridian 8 is located. Therefore, different curvatures can be set for each region according to the patient's corneal morphology, resulting in a relatively independent curvature design for the inner surface of the four regions. This makes it more consistent with the different refractive power distributions of different axes of the eye. In other words, each region of the positioning arc area 3 is more suitable for the patient's cornea, achieving a better fitting effect. Therefore, it is possible to precisely customize for different patients, improve the fit between the lens and the cornea, and enhance the safety during use.

[0024] It is worth mentioning that the positioning arc area 3 is divided into a first arc segment 35 and a second arc segment 36. The second arc segment 36 surrounds the outer edge of the first arc segment 35. The curvature of the first arc segment 35 is greater than that of the second arc segment 36. By connecting a flatter second arc segment 36 to the outer edge of the first arc segment 35, the starting point of the arc segment can be closer to the cornea, thereby achieving better arc segment closure and increasing the positioning effect.

[0025] Example 2: The difference from Example 1 is that...

[0026] like Figure 2As shown, the four dividing lines are the first horizontal meridian 5, the first oblique line 9, the second horizontal meridian 7, and the second oblique line 10. The angle between the first oblique line 9 and the first horizontal meridian 5 is 75-105 degrees and not equal to 90 degrees, and the angle between the second oblique line 10 and the first horizontal meridian 5 is also 75-105 degrees and not equal to 90 degrees. Controlling the angles of the first oblique line 9 and the second oblique line 10 allows for a better fit to the patient's cornea, facilitating precise personalized customization for different patients, further improving the fit to the cornea, effectively preventing lens displacement, and enhancing safety. Furthermore, the first region 31 and the second region 32 are defined by the first oblique line 9. The system is divided into zones: Zone 31 and Zone 32 are gradually connected; Zone 32 and Zone 33 are divided by the second horizontal meridian 7; Zone 33 and Zone 34 are gradually connected; Zone 33 and Zone 34 are divided by the second oblique line 10; Zone 33 and Zone 34 are gradually connected; Zone 34 and Zone 31 are divided by the first horizontal meridian 5; Zone 34 and Zone 31 are gradually connected. Thus, the inner surfaces of Zones 31, 32, 33, and 34 form a smooth curved surface, ensuring natural transition between zones and improving the lens's performance.

[0027] Furthermore, the curvature of the first region 31 decreases uniformly from the edge where the first oblique line 9 is located to the edge where the first horizontal meridian 5 is located; the curvature of the second region 32 decreases uniformly from the edge where the first oblique line 9 is located to the edge where the second horizontal meridian 7 is located; the curvature of the third region 33 increases uniformly from the edge where the second horizontal meridian 7 is located to the edge where the second oblique line 10 is located; and the curvature of the fourth region 34 increases uniformly from the edge where the first horizontal meridian 5 is located to the edge where the second oblique line 10 is located.

[0028] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A non-meridian asymmetric orthokeratology lens, comprising a circular arc-shaped lens body, characterized in that: The mirror body includes an integrally formed base arc region (1), a reverse arc region (2), a positioning arc region (3), and a side arc region (4) from the inside out. The positioning arc region (3) is divided into a first region (31), a second region (32), a third region (33), and a fourth region (34) by four dividing lines. The intersection of the four dividing lines is located at the center of the base arc region (1), and the four dividing lines include at least two meridians and at least one oblique line (6).

2. The non-meridian asymmetric orthokeratology lens according to claim 1, characterized in that: The four dividing lines are divided into a first horizontal meridian (5), an oblique line (6), a second horizontal meridian (7), and a vertical meridian (8). The angle between the oblique line (6) and the first horizontal meridian (5) is 75 degrees to 105 degrees and not equal to 90 degrees.

3. The non-meridian asymmetric orthokeratology lens according to claim 2, characterized in that: The curvature of the first region (31) decreases uniformly from the edge where the oblique line (6) is located to the edge where the first horizontal meridian (5) is located. The curvature of the second region (32) decreases uniformly from the edge where the oblique line (6) is located to the edge where the second horizontal meridian (7) is located. The curvature of the third region (33) increases uniformly from the edge where the second horizontal meridian (7) is located to the edge where the vertical meridian (8) is located. The curvature of the fourth region (34) increases uniformly from the edge where the first horizontal meridian (5) is located to the edge where the vertical meridian (8) is located.

4. The non-meridian asymmetric orthokeratology lens according to claim 1, characterized in that: The four dividing lines are divided into a first horizontal meridian (5), a first oblique line (9), a second horizontal meridian (7), and a second oblique line (10). The angle between the first oblique line (9) and the first horizontal meridian (5) is 75-105 degrees and not equal to 90 degrees. The angle between the second oblique line (10) and the first horizontal meridian (5) is 75-105 degrees and not equal to 90 degrees.

5. The non-meridian asymmetric orthokeratology lens according to claim 4, characterized in that: The curvature of the first region (31) decreases uniformly from the edge where the first oblique line (9) is located to the edge where the first horizontal meridian (5) is located. The curvature of the second region (32) decreases uniformly from the edge where the first oblique line (9) is located to the edge where the second horizontal meridian (7) is located. The curvature of the third region (33) increases uniformly from the edge where the second horizontal meridian (7) is located to the edge where the second oblique line (10) is located. The curvature of the fourth region (34) increases uniformly from the edge where the first horizontal meridian (5) is located to the edge where the second oblique line (10) is located.

6. The non-meridian asymmetric orthokeratology lens according to claim 1, characterized in that: The inner surfaces of the first region (31), the second region (32), the third region (33) and the fourth region (34) are connected to form a smooth curved surface.

7. The non-meridian asymmetric orthokeratology lens according to claim 1, characterized in that: The positioning arc area (3) is divided into a first arc segment (35) and a second arc segment (36). The second arc segment (36) surrounds the outer edge of the first arc segment (35), and the curvature of the first arc segment (35) is greater than the curvature of the second arc segment (36).

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