Contact lens
By setting a positioning structure on the front surface of the contact lens and using gravity for automatic positioning, the problem of inconvenient operation in the prior art is solved, and the convenience and comfort are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-17
AI Technical Summary
Existing contact lenses with asymmetrical optical designs require the operator to accurately adjust the angle when wearing them, which leads to inconvenience and discomfort.
A positioning structure is set on the front surface of the contact lens, which uses its own gravity to automatically position the lens in the circumferential direction, reducing the operation requirements for the operator, and the design of thickened and thinned areas reduces the impact on the eyeball.
It improves the convenience and comfort of wearing, reduces discomfort to the eyes, and enhances the positioning stability of the lens.
Smart Images
Figure CN224005379U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a contact lens. Background Technology
[0002] To improve the prevention and control of myopia and other eye conditions, some existing contact lenses feature asymmetrical optical designs. These lenses require a specific angle to be placed on the eyeball during wear. To achieve this, indicator marks can be placed on the lenses, allowing the user to select the correct angle for insertion. However, this places certain demands on the user's skill level, resulting in some inconvenience in wearing them. Utility Model Content
[0003] In view of this, the present invention provides a contact lens that can reduce the operational requirements for the operator and improve the ease of wearing.
[0004] To achieve the above objectives, this utility model provides a contact lens, including a rear surface facing the eyeball when worn and a front surface opposite to the rear surface. The contact lens has a positioning structure that enables the contact lens to maintain a predetermined circumferential position relative to the eyeball by its own weight when worn. The positioning structure is disposed on the front surface.
[0005] With the above structure, the contact lens has a positioning structure that allows it to be positioned relative to the eyeball in the circumferential direction by its own weight when worn. Therefore, compared with the method where the operator needs to rely on markings to select the circumferential angle, the contact lens can be automatically positioned, thereby reducing the operational requirements for the operator and improving the ease of wearing.
[0006] In addition, because the positioning structure is set on the front surface, the impact on the shape of the rear surface that comes into contact with or may come into contact with the eyeball can be reduced, thereby improving wearing comfort.
[0007] As one possible implementation, the positioning structure includes a weighted part disposed in the peripheral area surrounding the optical area.
[0008] Here, the term "weighted part" refers to the counterweight, meaning that this part of the contact lens is relatively larger than other parts.
[0009] As one possible implementation, the weight-bearing portion is formed by providing a thickened area in the peripheral region.
[0010] As one possible implementation, the weight-bearing part is disposed on the edge of the contact lens, and the number of weight-bearing parts is one or more, with multiple weight-bearing parts symmetrically arranged. The shape of the weight-bearing part is fan-shaped, crescent-shaped, circular, or flattened.
[0011] By symmetrically setting up the contact mirror, it is easy to keep it balanced and to position it in the desired location.
[0012] As one possible implementation, the vertical weight extends circumferentially, with an angular range of 10° to 180°, 20° to 140°, or 30° to 110° in the circumferential direction.
[0013] As one possible implementation, the radial range of the contact lens is set as follows: with the center of the optical zone as the center, the diameter range is 7mm to 15mm, 8mm to 14mm, or 9mm to 13mm.
[0014] As one possible implementation, two or more elliptical weight-bearing portions are provided, wherein the major axis of the plurality of elliptical weight-bearing portions extends circumferentially along the contact mirror, and the minor axis extends radially along the contact mirror.
[0015] The radial range of the contact lens is set as follows: within a diameter of 7mm to 15mm, 8mm to 14mm, or 9mm to 13mm, centered on the center of the optical area.
[0016] The distances between the multiple elliptical, vertically oriented portions and the outer edge of the contact lens are 0.01–0.3 mm, 0.03–0.2 mm, or 0.05–0.15 mm.
[0017] The major axis of the ellipse is 3–8 mm, 3.5–7 mm, or 4–6 mm, and the minor axis is 1–5 mm, 1.5–4.5 mm, or 2–4 mm.
[0018] As one possible implementation, the positioning structure includes a thickened region and a thinned region, which are arranged opposite each other across the center of the contact mirror along a certain diametrical direction.
[0019] As one possible implementation, the maximum size of the thickened area is 0.2–0.7 mm, 0.25–0.6 mm, or 0.3–0.5 mm.
[0020] As one possible implementation, the minimum size of the thinned region is 0.05–0.4 mm, 0.1–0.35 mm, or 0.15–0.3 mm.
[0021] As one possible implementation, the thickened region has an angular range of 50° to 130°, 65° to 115°, or 80° to 100° in the circumferential direction.
[0022] As one possible implementation, the thinning region has an angular range of 50° to 130°, 65° to 115°, or 80° to 100° in the circumferential direction.
[0023] As one possible implementation, the thickened region and the thinned region are symmetrically or asymmetrically distributed.
[0024] As one possible implementation, the peripheral region includes a thickness that gradually decreases continuously from one side to the other in a certain radial direction, across the center of the contact mirror, thereby forming the positioning structure.
[0025] As one possible implementation, the positioning structure includes at least two thinning regions that are arranged opposite each other across the center of the contact mirror in a radial direction.
[0026] By using the above structure, combined with the effects of gravity and the eyelids on the contact lens, the contact lens can be positioned at the desired circumferential position.
[0027] As one possible implementation, the width of the thinned region in the chordal direction of the contact mirror is 8–14 mm, 8.5–13 mm, or 9–12 mm.
[0028] As one possible implementation, the distance between the two thinning intervals is set such that, in the direction of the aforementioned "certain diameter", the closest interval between the two is 7.5–14 mm, 8–12.5 mm, or 8.5–11 mm.
[0029] As one possible implementation, the contact lens is a scleral contact lens or a corneal contact lens, wherein the corneal contact lens is a soft corneal contact lens, a rigid corneal contact lens, or a hybrid corneal contact lens, wherein the rigid corneal contact lens is a rigid non-gas-permeable corneal contact lens, a rigid gas-permeable corneal contact lens, or an orthokeratology lens.
[0030] The diameter of the optical zone of the corneal contact lens is 7-12 mm, and the diameter of the optical zone of the scleral contact lens is 7-12 mm.
[0031] As one possible implementation, a patterned area is provided in the optical area or peripheral area of the contact lens, and the patterned area is asymmetrical with respect to the center of the optical area.
[0032] As one possible implementation, the contact lens has an asymmetric defocus structure.
[0033] As one possible implementation, the contact mirror has an asymmetric field of view structure. Attached Figure Description
[0034] The various technical features of this application and their relationships will be further explained below with reference to the accompanying drawings. The drawings are exemplary; some technical features are not shown to scale, and some drawings may omit technical features commonly used in the art to which this application pertains that are not essential for understanding and implementing this application, or additionally show technical features that are not essential for understanding and implementing this application. In other words, the combination of various technical features shown in the drawings is not intended to limit this application. Furthermore, throughout this application, the same reference numerals refer to the same things. Specific descriptions of the drawings are as follows:
[0035] Figure 1 This is a schematic diagram of the structure of a lens according to one embodiment of the present invention;
[0036] Figure 2 This is a schematic diagram of the structure of a lens according to one embodiment of the present invention;
[0037] Figure 3 This is a schematic diagram of the structure of a lens according to one embodiment of the present invention;
[0038] Figure 4 This is a schematic diagram of the structure of a lens according to one embodiment of the present invention;
[0039] Figure 5 This is a schematic diagram of the structure of a lens according to one embodiment of the present invention;
[0040] Figure 6 This is a schematic diagram of the structure of a lens according to one embodiment of the present invention;
[0041] Figure 7 This is a schematic diagram of the structure of a lens according to one embodiment of the present invention;
[0042] Figure 8 This is a schematic diagram of the structure of a lens according to one embodiment of the present invention;
[0043] Figure 9 yes Figure 8 Schematic diagram of the cross section at line AA;
[0044] Figure 10 yes Figure 8 Schematic diagram of the cross section at the middle BB line;
[0045] Figure 11 This is a schematic diagram of the lens structure according to one embodiment of the present invention. Detailed Implementation
[0046] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0047] Figure 1 This is a schematic diagram of the lens structure according to one embodiment of the present invention.
[0048] like Figure 1 As shown, the lens 10 (contact lens) is generally circular, having a circular optical region 1 at the center and a peripheral region 2 around the optical region 1. In other embodiments, the optical region 1 may also be other shapes, such as elliptical.
[0049] The contact lens 10 has a thickened region 31a and a thinned region 31b, which are positioned opposite each other across the center of the lens 10 (180 degrees apart circumferentially). Thus, the thickened region 31a and the thinned region 31b constitute a positioning structure that allows the lens 10 to be positioned circumferentially. Specifically, when the lens is worn, because the thickened region 31a is relatively heavier and the thinned region 31b is relatively lighter, the lens will rotate or remain in a circumferential position with the thickened region 31a on the lower side and the thinned region 31b on the upper side due to gravity, thereby automatically positioning itself circumferentially relative to the eyeball.
[0050] In addition, in this embodiment, the thickened area 31a and the thinned area 31b are provided in the peripheral area 2, thereby suppressing the impact on the optical area 1, improving the effect of myopia prevention and control, or providing better visual effects.
[0051] In addition, the lens 10 has a posterior surface facing the eyeball when worn and a front surface opposite to the posterior surface. The thickening region 31a and the thinning region 31b increase / decrease the material formation on the front surface of the lens 10, thereby suppressing the influence on the surface shape of the posterior surface and thus improving wearing comfort.
[0052] Figure 2 This is a schematic diagram of the lens structure according to one embodiment of the present invention.
[0053] like Figure 2 As shown, the lens 10 has a weight-bearing portion 3A, which is fan-shaped and located in the peripheral region 2 at its outer edge. As described above, the weight-bearing portion 3A can be formed by locally thickening the lens. In this embodiment, the width of the weight-bearing portion 3A is within a 40-degree central angle range.
[0054] In addition, the radial range of the fan-shaped annular weight portion 3A can be set as follows: within a range of 7mm to 15mm in diameter from the center optical zone, preferably 8mm to 14mm, and more preferably within a range of 9mm to 13mm.
[0055] In addition, the area of the weight-bearing part 3A can be set as follows: not limited to the above-mentioned 40 degrees, the angle between the edges of the weight-bearing part 3A in the circumferential direction is 10° to 180°, preferably 20° to 140°, and more preferably 30° to 110°.
[0056] Figure 3 This is a schematic diagram of the lens structure according to one embodiment of the present invention. This embodiment is related to... Figure 2 The main difference in the embodiment shown is that the width of the vertical weight 3B is within an 80-degree central angle range.
[0057] Figure 4 This is a schematic diagram of the lens structure according to one embodiment of the present invention. This embodiment is related to... Figure 2 The main difference in the embodiment shown is that the width of the vertical weight 3C is within a 180-degree central angle range.
[0058] Figure 5 This is a schematic diagram of the lens structure according to one embodiment of the present invention. This embodiment is related to... Figure 2 The main difference in the illustrated embodiment is that it has two 3D weight-bearing sections, which are spaced apart circumferentially. Furthermore, the two 3D weight-bearing sections are symmetrically arranged. Alternatively, more weight-bearing sections can be provided; the structures of these sections can be identical or different. For example, three (an odd number) weight-bearing sections can be provided, with the two outermost sections symmetrical and the middle section having a different structure (e.g., shape) from the other two.
[0059] Figure 6 This is a schematic diagram of the lens structure according to one embodiment of the present invention. This embodiment is related to... Figure 5 The main difference in the illustrated embodiment is that the weight-bearing portion 3E is elliptical. Furthermore, in this embodiment, the longer side of the ellipse of the weight-bearing portion 3E extends approximately circumferentially along the lens 10, and the shorter side extends approximately radially along the lens 10. As a variation, more elliptical weight-bearing portions may be provided.
[0060] The range of the weight-bearing part 3E in the radial direction of the lens is set as follows: with the center of the optical zone as the center, the diameter is within the range of 7mm to 15mm, 8mm to 14mm, or 9mm to 13mm.
[0061] Choose an ellipse length (major axis) of 3–8 mm, preferably 3.5–7 mm, and even more preferably 4–6 mm. Choose an ellipse width (minor axis) of 1–5 mm, preferably 1.5–4.5 mm, and even more preferably 2–4 mm.
[0062] The distance (closest point) between the multiple elliptical weight-bearing parts and the outer edge of the lens is 0.01–0.3 mm, 0.03–0.2 mm, or 0.05–0.15 mm.
[0063] Figure 7 This is a schematic diagram of the lens structure according to one embodiment of the present invention. This embodiment is related to... Figure 1 The main difference in the illustrated embodiment is that the thickened region 32a and the thinned region 32b are fan-shaped annular. Furthermore, their widths (the range they occupy in the circumferential direction) are within a 90-degree central angle range (area).
[0064] This embodiment divides the lens edge (peripheral area) into 4 quadrants, and the cross-sectional view of the thickened area at the lens edge (along...) Figure 7 Looking at the diameter line in the top and bottom direction, the maximum size range of the thickened area is selected as 0.2 to 0.7 mm, preferably 0.25 to 0.6 mm, and more preferably 0.3 to 0.5 mm; the minimum size range of the thinned area is selected as 0.05 to 0.4 mm, preferably 0.1 to 0.35 mm, and more preferably 0.15 to 0.3 mm.
[0065] The division of the four quadrants is not limited to four equal parts (90 degrees). The thickening zone range can be selected from 50° to 130°, with a preference for 65° to 115° and a more preferred range of 80° to 100°. The thinning zone range can be selected from 50° to 130°, or 65° to 115°, or 80° to 100°.
[0066] Thickened and thinned areas can be symmetrically distributed (including areas with the same circumferential size), or they can be asymmetrically distributed.
[0067] Figure 8 This is a schematic diagram of the structure of a lens according to one embodiment of the present invention; Figure 9 yes Figure 8 Schematic diagram of the cross section at line AA; Figure 10 yes Figure 8 A cross-sectional schematic diagram at the BB line. The main difference between this embodiment and the above embodiment is the different formation method of the positioning structure. Specifically, in this embodiment, the thickness of the peripheral region 2 of the lens 10 increases from one side in a certain radial direction (e.g., Figure 8 The lower edge of the lens extends vertically past the center of the lens to the other side (e.g., the lower edge of the lens). Figure 8 The upper edge of the middle section changes gradually.
[0068] Reference Figure 9 , Figure 10 Lens 10 in the surrounding area 2 Figure 8 The thickness T2 of the lower edge is greater than the thickness T1 of the upper edge. Furthermore, the thickness distribution of the peripheral region 2 corresponds to the radial diameter (e.g.,...). Figure 8 The diameter extending vertically is symmetrical around the center, as shown in the reference. Figure 10Surrounding area 2 ( Figure 8 The thicknesses T2 and T3 of the left and right sides of the middle section are equal.
[0069] In this embodiment, the upper and lower edges of the entire lens gradually transition, resulting in a non-uniform thickness distribution at the upper and lower edges, exhibiting a gradual trend. This transition occurs at the lower part of the lens. Figure 8 The thickness is at its thickest point in the horizontal direction, and then gradually decreases in two directions at a fixed ratio until the top of the lens is the thinnest point. The horizontal direction has a uniform and stable thickness distribution. The purpose is to achieve a gradual transition in lens weight distribution, so that while achieving weight positioning, there is no obvious thickening zone in the lens thickness, thus improving comfort.
[0070] Furthermore, this design in this embodiment can divide the lens into two quadrants, with the upper half thinned and the lower half thickened. In the cross-sectional view of the thickened area at the lens edge (cut along the diameter line in the vertical direction), the maximum size range of the thickened area is selected to be 0.2–0.7 mm, preferably 0.25–0.6 mm, and more preferably 0.3–0.5 mm. The minimum size range of the thinned area is selected to be 0.05–0.4 mm, preferably 0.1–0.35 mm, and more preferably 0.15–0.3 mm.
[0071] Figure 11 This is a schematic diagram of the lens structure according to one embodiment of the present invention. The main difference between this embodiment and the above-described embodiments is that, in the above embodiments, the positioning structure includes a thickened portion, while in this embodiment, the positioning structure includes two thinned portions 33a and 33b. (Refer to...) Figure 11 Two thinned portions 33a and 33b are positioned opposite each other along a certain diameter of the lens 10, separated by a gap from the center of the lens 10. Thus, combined with the gravitational balance of the lens and the interaction between the eyelid and the eyeball, the lens can be rotated to the correct position. Specifically, because the eyelid exerts pressure on the eyeball, the lens is designed with uneven thickness. This allows the thicker edge to automatically rotate to the area not covered by the eyelid, while the thinner edge rotates to the upper or lower side covered by the eyelid, thereby positioning the lens 10.
[0072] Furthermore, in this embodiment, the widths of the thinned portions 33a and 33b are set such that the width L1 in the chord direction is 8 to 14 mm, preferably 8.5 to 13 mm, and more preferably 9 to 12 mm. The distance between the thinned portions 33a and 33b is set such that, in the direction of the aforementioned "certain diameter," the closest interval L2 between them is 7.5 to 14 mm, preferably 8 to 12.5 mm, and more preferably 8.5 to 11 mm.
[0073] The contact lens of this application can have an asymmetrical optical design, such as an asymmetrical defocus design, an asymmetrical pattern design, and a field-of-view design. As an asymmetrical defocus design, it can be a shape that is asymmetrical on the left-right axis of the chord length (horizontal axis) - defocus amount (vertical axis) curve. The asymmetrical pattern design can be a non-centrally symmetrical pattern formed in the optical area (or peripheral area), for example, a first circular pattern in the optical area, and a non-centrally symmetrical second pattern formed within the first pattern. The field-of-view design can set different vertical and horizontal field-of-view angles to achieve a better field of view. By combining the above positioning structure, the contact lens can be worn in a specified circumferential position (angular position) to achieve the desired corrective purpose or to achieve a better visual effect.
[0074] Examples of contact lenses include scleral contact lenses and corneal contact lenses. Corneal contact lenses can be soft, rigid, or hybrid types. Rigid contact lenses can be rigid non-gas-permeable, rigid gas-permeable, or orthokeratology lenses. The diameter of the optical zone of both corneal and scleral contact lenses is 7–12 mm.
[0075] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the technical concept of this application, all of which fall within the scope of protection of this application.
Claims
1. A contact lens comprising a back surface facing the eyeball when worn and a front surface opposite the back surface, characterized in that, The contact lens has a positioning structure that positions the contact lens in a circumferential direction with respect to the eyeball by its own gravity when worn, and the positioning structure is provided on the front surface.
2. The contact lens of claim 1, wherein, The positioning structure includes a gravity portion provided in a peripheral area of an optical zone.
3. The contact lens of claim 2, wherein, The gravity portion is formed by providing a thickened area in the peripheral area.
4. The contact lens of claim 2, wherein, The gravity portion is provided in an edge portion of the contact lens, The number of the gravity portions is one or more, and a plurality of the gravity portions are symmetrically provided, The gravity portion has a shape of a fan-shaped ring, a crescent, a circle, or an oblate circle.
5. The contact lens of claim 2, wherein, The gravity portion extends in a circumferential direction, and the range in the circumferential direction is an angle range of 10° to 180°, an angle range of 20° to 140°, or an angle range of 30° to 110°.
6. The contact lens of claim 2, wherein, The range in a radial direction of the contact lens is set to a range of 7 mm to 15 mm, 8 mm to 14 mm, or 9 mm to 13 mm in diameter with the center of the optical zone as the center.
7. The contact lens of claim 2, wherein, The two or more gravity portions are elliptical, the long axis direction of the plurality of the gravity portions is in the circumferential direction of the contact lens, and the short axis direction is in the radial direction of the contact lens, The range in the radial direction of the contact lens is set to a range of 7 mm to 15 mm, 8 mm to 14 mm, or 9 mm to 13 mm in diameter with the center of the optical zone as the center. The distance of the plurality of the gravity portions from the outer edge line of the contact lens is 0.01 mm to 0.3 mm, 0.03 mm to 0.2 mm, or 0.05 mm to 0.15 mm. The long axis of the ellipse is 3 mm to 8 mm, 3.5 mm to 7 mm, or 4 mm to 6 mm, and the short axis of the ellipse is 1 mm to 5 mm, 1.5 mm to 4.5 mm, or 2 mm to 4 mm.
8. The contact lens of claim 1, wherein, The positioning structure includes a thickened area and a thinned area, and the thickened area and the thinned area are oppositely arranged across the center of the contact lens in a certain diameter direction of the contact lens.
9. The contact lens of claim 8, wherein, The maximum size of the thickened area is 0.2 mm to 0.7 mm, 0.25 mm to 0.6 mm, or 0.3 mm to 0.5 mm.
10. The contact lens according to claim 8, wherein The minimum size of the thinned area is 0.05 mm to 0.4 mm, 0.1 mm to 0.35 mm, or 0.15 mm to 0.3 mm.
11. The contact lens of claim 8, wherein, The range of the thickened area in the circumferential direction is an angle range of 50° to 130°, an angle range of 65° to 115°, or an angle range of 80° to 100°.
12. The contact lens of claim 8, wherein, The range of the thinned area in the circumferential direction is an angle range of 50° to 130°, an angle range of 65° to 115°, or an angle range of 80° to 100°.
13. The contact lens of claim 8, wherein, The thickened area and the thinned area are symmetrically distributed or asymmetrically distributed.
14. The contact lens of claim 1, wherein, The peripheral area includes a thickness that continuously and gradually decreases from one side to the other side across the center of the contact lens in a certain radial direction, thereby forming the positioning structure.
15. The contact lens of claim 1, wherein, The positioning structure includes at least two thinned areas, and the two thinned areas are oppositely arranged across the center of the contact lens in a certain radial direction of the contact lens.
16. The contact lens of claim 15, wherein, The width of the thinned area in the chord length direction of the contact lens is 8 mm to 14 mm, 8.5 mm to 13 mm, or 9 mm to 12 mm.
17. The contact lens of claim 15, wherein, The distance between the two thinning regions is set to be 7.5-14 mm, 8-12.5 mm or 8.5-11 mm at the closest point in the certain radial direction.
18. The contact lens of any one of claims 1-13, wherein, The contact lens is a scleral contact lens or a corneal contact lens, The corneal contact lens is a soft corneal contact lens, a hard corneal contact lens or a hybrid corneal contact lens, wherein the hard corneal contact lens is a hard non-gas permeable corneal contact lens, a hard gas permeable corneal contact lens or a corneal orthotic, The diameter of the optical zone of the corneal contact lens is 7-12 mm, and the diameter of the optical zone of the scleral contact lens is 7-12 mm.
19. The contact lens of any one of claims 1-13, wherein, A pattern region is provided in the optical zone or the peripheral zone of the contact lens, and the pattern region is asymmetric with respect to the center of the optical zone.
20. The contact lens of any one of claims 1-13, wherein, The contact lens has an asymmetric defocus structure.
21. The contact lens of any one of claims 1-13, wherein, The contact lens has an asymmetric field angle structure.