Extraocular wearing contact lens and contact lens assembly

Abstract

The utility model provides an extraocular wearing contact lens and a contact lens assembly, and relates to the technical field of ophthalmic optics. The extraocular wearing contact lens comprises an optical part and a peripheral area surrounding the periphery of the optical part, the optical part comprises a central correction area with the geometric center of the contact lens as the circle center and a defocus area surrounding the periphery of the central correction area, the central correction area has prescription focal power for correcting vision, and the prescription focal power is matched with the degree, needing to be corrected, of a wearer; the focal power of the defocus area is greater than or equal to the focal power of the central correction area, and the distribution trends of the focal powers of at least two angles of the defocus area along the radius are different; and the peripheral area is provided with a self-rotating structure for enabling the contact lens to automatically rotate. According to the extraocular wearing contact lens provided by the utility model, focal power distribution can be changed along different angles through a single contact lens, and dynamic defocus can be formed through a self-rotation structure, so that effective stimulation obtained by each position on the retina is improved, and the myopia prevention and control effect is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of optometry technology, and in particular to an external contact lens and contact lens assembly. Background Technology

[0002] Current contact lenses for myopia control only move slightly up and down during wear. However, the myopia defocus signal or sensitivity received by the human retina is fixed in 360 degrees. This results in the stimulation received by different positions on the retina being constant. Under the long-term effect of this fixed signal, the effective stimulation received by the human eye will gradually weaken. In other words, the human eye develops "resistance" to contrast sensitivity or defocus signal, which is not conducive to myopia control and easily leads to poor myopia control results. Utility Model Content

[0003] This invention provides an external contact lens to address the problem of poor myopia control in existing technologies.

[0004] This invention provides an extraocular contact lens, comprising an optical part and a peripheral area surrounding the optical part. The optical part includes a central correction zone centered on the geometric center of the contact lens and a defocus zone surrounding the central correction zone. The central correction zone has a prescription optical power for correcting visual acuity, which is adapted to the degree of correction required by the wearer. The optical power of the defocus zone is greater than or equal to the optical power of the central correction zone, and the optical power of the defocus zone has different radial distribution trends at at least two angles. The peripheral area is provided with a self-rotating structure for automatically rotating the contact lens.

[0005] According to the present invention, an external contact lens is provided, wherein the self-rotating structure includes a tear channel disposed in the peripheral area, the tear channel being located on the front or rear surface of the contact lens, and the tear channel extending radially along the contact lens.

[0006] According to the present invention, in an external contact lens, the cross-sectional area or cross-sectional width of the tear channel gradually decreases from the first end to the second end of the tear channel.

[0007] According to the present invention, at least one of the first end and the second end of the tear channel forms a port at the edge of the contact lens.

[0008] According to the present invention, an external contact lens is provided, wherein the first end and the second end of the tear channel are located at different positions in the circumferential direction of the contact lens.

[0009] According to the present invention, an external contact lens is provided, wherein the tear channel extends from the edge of the contact lens first toward the defocus area, and then extends away from the defocus area.

[0010] According to the present invention, an external contact lens is provided, wherein the tear channel is V-shaped, C-shaped, or U-shaped.

[0011] According to the present invention, an external contact lens is provided, wherein the tear channel has a first sidewall and a second sidewall, both of which extend along the length direction of the tear channel.

[0012] According to the present invention, an external contact lens is provided, wherein the first sidewall and the second sidewall have the same curvature direction, and the curvature of the first sidewall is greater than that of the second sidewall.

[0013] According to the present invention, an external contact lens is provided, wherein the self-rotating structure includes multiple tear channels, which are arranged at intervals along the circumference of the contact lens.

[0014] According to the present invention, at least part of the tear channel is a groove-shaped structure disposed on the rear surface of the contact lens.

[0015] According to the present invention, at least a portion of the tear channel is located inside the contact lens.

[0016] According to the present invention, an external contact lens is provided in which the cross-sectional area or cross-sectional width of the tear channel changes continuously or in stages along the length direction of the tear channel.

[0017] According to the present invention, at least a portion of the tear channel extends radially along the contact lens.

[0018] According to the present invention, in an external contact lens, at least a portion of the cross-sectional area or cross-sectional width of the tear channel gradually decreases in the radial inward direction along the contact lens.

[0019] According to the present invention, an external contact lens is provided, wherein the diameter of the optical part is 7-12mm and the diameter of the central correction zone is 1.5-3.5mm.

[0020] According to the present invention, for an external contact lens, within the annular width of the defocus zone, the optical power variation curve with angle on the circumference corresponding to any radius r is provided. Continuously differentiable, where θ∈[0°, 360°), r∈(D1 / 2, D2 / 2], D1 is the inner diameter of the defocused region, and D2 is the outer diameter of the defocused region.

[0021] According to the present invention, an external contact lens is provided, wherein the defocus area has a non-continuous curve of optical power versus radius at at least one angle.

[0022] According to the present invention, the optical power at any angle of the defocus area gradually increases with the radius, or the rate of change of the optical power at any angle of the defocus area with the radius is continuous and first increases and then decreases, and the rate of change is not 0.

[0023] According to the present invention, the optical power at any angle of the defocus area gradually increases with the radius, or the rate of change of the optical power at any angle of the defocus area with the radius is continuous and first increases and then decreases, and finally tends to be uniform, and the rate of change is not 0.

[0024] According to the present invention, an external contact lens is provided, wherein the defocus area has at least one angle where the rate of change of optical power with radius is discontinuous.

[0025] According to the present invention, an external contact lens is provided in which at least two angles θ1 and θ2 exist within the annular width of the defocus zone, and the radial optical power curve corresponding to angle θ1 varies with the radius. Curve of radial optical power as a function of radius corresponding to angle θ2 They are not the same, where θ1∈[0°, 360°), θ2∈[0°, 360°), and r∈(D1 / 2, D2 / 2).

[0026] According to the present invention, an external contact lens has at least one optical power variation curve with angle on the circumference corresponding to a radius r1 within the annular width of the defocus area. It is not a constant value, where θ∈[0°, 360°) and r1∈(D1 / 2, D2 / 2).

[0027] According to the present invention, an external contact lens has a sector whose vertex coincides with the geometric center. Within any r within the sector, the optical power changes with the angle in accordance with the trend of a sine function.

[0028] According to the present invention, within the annular width of the defocus zone, on at least one diameter passing through the geometric center, the optical power distribution trends of the two radii are not the same; on the remaining diameters passing through the geometric center, the optical power distribution trends of the two radii are symmetrical about the geometric center. , θ∈[0°, 360°), r1∈(D1 / 2, D2 / 2], and θ is not equal to the direction of the diameter where the optical power distribution trend is different.

[0029] According to the contact lens provided by this utility model, within the annular width of the defocus zone, the optical power variation curves with radius for any angles θ1 and θ2 are not the same, i.e. Where θ1∈[0°, 360°), θ2∈[0°, 360°), r∈(D1 / 2, D2 / 2).

[0030] According to the extraocular contact lens provided by this utility model, the trend of optical power variation with angle on a semicircle corresponding to any radius r conforms to... , where θ∈(0°, 180°), r∈(D1 / 2, D2 / 2], and a and b are constants.

[0031] According to the present invention, the optical power variation curve of the semicircle corresponding to any radius r on the external contact lens conforms to the following formula (1).

[0032] (1)

[0033] Where r∈(D1 / 2, D2 / 2], , It is a constant. .

[0034] According to the present invention, the optical power of an external contact lens on a semicircle corresponding to any radius r changes with the angle in accordance with the following formula (2).

[0035] (2)

[0036] Where r∈(D1 / 2, D2 / 2], , It is a constant. .

[0037] According to the present invention, an extraocular contact lens provides a curve showing the change in radial optical power at any angle θ with the radius of the defocused area within the annular width of the defocused zone. It is continuously differentiable, where θ∈(0°, 360°) and r∈(D1 / 2, D2 / 2).

[0038] According to the present invention, an external contact lens is provided, wherein the contact lens is a corneal contact lens or a scleral contact lens, and the diameter of the optical part of the corneal contact lens and the diameter of the optical part of the scleral contact lens are both 6-12mm.

[0039] This invention also provides a contact lens assembly, comprising at least two external contact lenses as described above, wherein the contact lenses are daily disposable, weekly disposable, bi-monthly disposable, monthly disposable, quarterly disposable, semi-annual disposable, or annual disposable. The external contact lenses provided by this invention can not only achieve changes in optical power distribution along different angles through a single contact lens, but also form dynamic defocus through a self-rotating structure, thereby improving the effective stimulation received at various positions on the retina and enhancing the myopia control effect. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is one of the schematic diagrams of the optical power of a contact lens as a function of radius in the prior art.

[0042] Figure 2 This is one of the schematic diagrams of the optical power variation curve with radius provided by this utility model.

[0043] Figure 3 This is one of the three-dimensional schematic diagrams showing the trend of optical power variation of the contact lens provided by this utility model.

[0044] Figure 4 This is one of the top-view schematic diagrams showing the trend of optical power variation of the contact lens provided by this utility model.

[0045] Figure 5 This is one of the schematic diagrams of the optical power variation curve with angle provided by this utility model.

[0046] Figure 6 This is one of the schematic diagrams of the optical power variation curves with radius at several specific angles provided by this utility model.

[0047] Figure 7 This is one of the schematic diagrams showing the positional relationship of radii corresponding to several specific angles provided by this utility model.

[0048] Figure 8This is one of the schematic diagrams showing the rate of change of optical power with radius at several specific angles provided by this utility model.

[0049] Figure 9 This is a schematic diagram of the structure of the contact mirror provided by this utility model.

[0050] Figure 10 This is the second schematic diagram of the optical power of a contact lens as a function of radius in the prior art.

[0051] Figure 11 This is the second schematic diagram of the optical power variation curve with radius provided by this utility model.

[0052] Figure 12 This is the second three-dimensional schematic diagram of the optical power variation trend of the contact lens provided by this utility model.

[0053] Figure 13 This is the second top view schematic diagram of the optical power variation trend of the contact lens provided by this utility model.

[0054] Figure 14 This is the second schematic diagram of the optical power variation curve provided by this utility model.

[0055] Figure 15 This is the second schematic diagram of the curves showing the change of optical power with radius at several specific angles provided by this utility model.

[0056] Figure 16 This is the second schematic diagram showing the positional relationship of radii corresponding to several specific angles provided by this utility model.

[0057] Figure 17 This is the second of several schematic diagrams showing the rate of change of optical power with radius at specific angles provided by this utility model.

[0058] Figure 18 This is the third schematic diagram of the optical power of a contact lens as a function of radius in the prior art.

[0059] Figure 19 This is the third schematic diagram of the optical power variation curve with radius provided by this utility model.

[0060] Figure 20 This is the third three-dimensional schematic diagram of the optical power variation trend of the contact lens provided by this utility model.

[0061] Figure 21 This is the third top-view schematic diagram of the optical power variation trend of the contact lens provided by this utility model.

[0062] Figure 22 This is the third schematic diagram of the optical power variation curve provided by this utility model.

[0063] Figure 23This is the third of several schematic diagrams showing the variation curves of optical power with radius at specific angles provided by this utility model.

[0064] Figure 24 This is the third schematic diagram showing the positional relationship of radii corresponding to several specific angles provided by this utility model.

[0065] Figure 25 This is one of the cross-sectional structural schematic diagrams of the contact mirror provided by this utility model.

[0066] Figure 26 yes Figure 25 A partially enlarged structural diagram.

[0067] Figure 27 This is the second cross-sectional structural schematic diagram of the contact mirror provided by this utility model.

[0068] Figure 28 yes Figure 27 A partially enlarged structural diagram.

[0069] Figure 29 This is one of the main view structural schematic diagrams of the contact lens provided by this utility model.

[0070] Figure 30 yes Figure 29 A schematic diagram of the tear channel structure.

[0071] Figure 31 This is the second schematic diagram of the main view structure of the contact lens provided by this utility model.

[0072] Figure 32 This is the third schematic diagram of the main view structure of the contact lens provided by this utility model.

[0073] Figure 33 This is the fourth schematic diagram of the main view structure of the contact lens provided by this utility model.

[0074] Figure 34 This is the fifth schematic diagram of the main view structure of the contact lens provided by this utility model.

[0075] Figure 35 This is the sixth schematic diagram of the main view structure of the contact lens provided by this utility model.

[0076] Figure 36 This is the seventh schematic diagram of the main view structure of the contact lens provided by this utility model.

[0077] Figure 37 yes Figure 36 A schematic diagram of the tear channel structure.

[0078] Figure 38 This is the eighth schematic diagram of the main structure of the contact lens provided by this utility model.

[0079] Figure 39 This is the ninth schematic diagram of the main view structure of the contact lens provided by this utility model.

[0080] Figure 40 This is the tenth schematic diagram of the main structure of the contact lens provided by this utility model.

[0081] Figure 41 This is the eleventh schematic diagram of the main structure of the contact lens provided by this utility model.

[0082] Figure 42 This is the twelfth schematic diagram of the main view structure of the contact lens provided by this utility model.

[0083] Figure 43 This is one of the structural schematic diagrams of the tear channel provided by this utility model.

[0084] Figure 44 This is the second schematic diagram of the tear channel provided by this utility model.

[0085] Figure 45 This is the third schematic diagram of the tear channel provided by this utility model.

[0086] Figure 46 This is the fourth schematic diagram of the tear channel provided by this utility model.

[0087] Figure label:

[0088] 1. Optical section; 2. Peripheral area; 3. Marking; 4. First sidewall; 5. Second sidewall; 6. Tear channel; 7. Port; 8. Front surface; 9. Rear surface; 10. Contact lens. Detailed Implementation

[0089] like Figure 1 As shown, the contact lens 10 includes an optical section 1 and a peripheral region 2 surrounding the optical section 1. The optical section 1 includes a central correction zone centered on the geometric center of the contact lens 10 and a defocus zone surrounding the central correction zone. The central correction zone has a prescription optical power for correcting vision, and the prescription optical power is adapted to the degree of correction required by the wearer. The optical power of the defocus zone is greater than or equal to the optical power of the central correction zone, and the optical power distribution trend along the radius is different at at least two angles in the defocus zone. The peripheral region 2 is provided with a self-rotating structure for automatically rotating the contact lens 10.

[0090] The contact lens 10 provided by this invention can not only change the optical power distribution along different angles through a single contact lens 10, but also form dynamic defocus through a self-rotating structure, thereby improving the effective stimulation obtained at various positions on the retina and enhancing the myopia control effect.

[0091] In one embodiment of the present invention, the self-rotating structure includes a tear channel 6 disposed in the peripheral region 2. The tear channel 6 is located on the front surface 8 or the rear surface 9 of the contact lens 10 and extends radially along the contact lens 10.

[0092] In one embodiment of the present invention, the cross-sectional area or cross-sectional width of the tear channel 6 gradually decreases from the first end to the second end of the tear channel 6.

[0093] It should be noted that the first end of the tear channel 6 refers to the end of the tear channel 6 furthest from the geometric center, and the second end refers to the end of the tear channel 6 closest to the geometric center. Making the cross-sectional area of ​​the tear channel 6 gradually decrease from the first end to the second end involves not only reducing the width of the cross-section but also reducing its height. The height of the cross-section is its dimension along the depth direction of the tear channel 6. The cross-section of the tear channel 6 refers to a section perpendicular to its length.

[0094] In one embodiment of the present invention, at least one of the first end and the second end of the tear channel 6 forms a port 7 at the edge of the contact lens 10.

[0095] In one embodiment of this invention, the first end and the second end of the tear channel 6 are located at different positions in the circumferential direction of the contact lens 10.

[0096] In one embodiment of this invention, the tear channel 6 extends from the edge of the contact lens 10 first toward the defocus area, and then extends away from the defocus area. Thus, both the first and second ends of the tear channel 6 are located at the edge of the contact lens 10, forming a folded-back channel.

[0097] In one embodiment of this utility model, the tear channel 6 is V-shaped, C-shaped, or U-shaped.

[0098] In one embodiment of this invention, the tear channel 6 has opposing first sidewalls 4 and second sidewalls 5, both extending along the length of the tear channel 6. The distance between the first sidewall 4 and the second sidewall 5 varies with the cross-sectional width of the tear channel 6; as the cross-sectional width of the tear channel 6 gradually decreases from the first end to the second end, the distance between the first sidewall 4 and the second sidewall 5 also gradually decreases.

[0099] In one embodiment of the present invention, the first sidewall 4 and the second sidewall 5 have the same bending direction, and the curvature of the first sidewall 4 is greater than the curvature of the second sidewall 5.

[0100] In one embodiment of the present invention, the self-rotating structure includes multiple tear channels 6, which are arranged at intervals along the circumference of the contact lens 10.

[0101] In one embodiment of the present invention, at least a portion of the tear channel 6 is a groove-shaped structure disposed on the rear surface 9 of the contact lens 10.

[0102] In one embodiment of the present invention, at least a portion of the tear channel 6 is located inside the contact lens 10.

[0103] In one embodiment of this utility model, the cross-sectional area or cross-sectional width of the tear channel 6 changes continuously or in stages along the length direction of the tear channel 6.

[0104] It should be noted that the phased change in the cross-sectional area or cross-sectional width of the tear channel 6 means that the cross-sectional area or cross-sectional width of a certain segment of the tear channel 6 changes, while the cross-sectional area or cross-sectional width of another segment of the tear channel 6 does not change, that is, the cross-sectional area or cross-sectional width of the tear channel 6 is a fixed value.

[0105] In one embodiment of the present invention, the cross-section of the tear channel 6 is circular. Of course, the cross-sectional shape of the tear channel 6 is not limited to this, and it can also be polygonal or other shapes.

[0106] In one embodiment of the present invention, at least a portion of the tear channel 6 extends radially along the contact lens 10.

[0107] In one embodiment of the present invention, at least a portion of the cross-sectional area or cross-sectional width of the tear channel 6 gradually decreases in the radial inward direction along the contact lens 10.

[0108] In one embodiment of this utility model, the diameter of the optical part 1 is 7-12mm, and the diameter of the central correction area is 1.5-3.5mm.

[0109] In one embodiment of this invention, within the annular width of the defocus zone, the optical power variation curve with angle on the circumference corresponding to any radius r is shown. Continuously differentiable, where θ∈[0°, 360°), r∈(D1 / 2, D2 / 2], D1 is the inner diameter of the defocused region, and D2 is the outer diameter of the defocused region.

[0110] In one embodiment of this utility model, the defocused area has a non-continuous curve of optical power versus radius at at least one angle.

[0111] In one embodiment of this utility model, the optical power at any angle of the defocus area gradually increases with the radius, or the rate of change of the optical power at any angle of the defocus area with the radius is continuous and first increases and then decreases, and the rate of change is not 0.

[0112] In one embodiment of this utility model, the optical power at any angle of the defocused area gradually increases with the radius, or the rate of change of the optical power at any angle of the defocused area with the radius is continuous and first increases and then decreases, and finally tends to be uniform, and the rate of change is not 0.

[0113] In one embodiment of this invention, the rate of change of optical power with radius in the defocused region at least at one angle is discontinuous.

[0114] In one embodiment of this invention, within the annular width of the defocused region, there are at least two angles θ1 and θ2, and the radial optical power curve corresponding to angle θ1 varies with the radius. Curve of radial optical power as a function of radius corresponding to angle θ2 They are not the same, where θ1∈[0°, 360°), θ2∈[0°, 360°), and r∈(D1 / 2, D2 / 2).

[0115] In one embodiment of this invention, within the annular width of the defocused region, there is at least one curve showing the change in optical power as a function of angle on the circumference corresponding to a radius r1. It is not a constant value, where θ∈[0°, 360°) and r1∈(D1 / 2, D2 / 2).

[0116] In one embodiment of this utility model, there is a sector with a vertex coinciding with the geometric center. Within the sector, on any circle corresponding to r, the optical power changes with the angle in accordance with the trend of a sine function.

[0117] In one embodiment of this invention, within the annular width of the defocused region, the optical power distribution trends of the two radii are different along at least one diameter passing through the geometric center; along the remaining diameters passing through the geometric center, the optical power distribution trends of the two radii are symmetrical about the geometric center. , θ∈[0°, 360°), r1∈(D1 / 2, D2 / 2], and θ is not equal to the direction of the diameter with different optical power distribution trends.

[0118] In one embodiment of this invention, within the annular width of the defocus zone, the optical power variation curves with radius for any angles θ1 and θ2 are not the same, i.e. Where θ1∈[0°, 360°), θ2∈[0°, 360°), r∈(D1 / 2, D2 / 2).

[0119] In one embodiment of this utility model, the trend of optical power variation with angle on the semicircle corresponding to any radius r conforms to... , where θ∈(0°, 180°), r∈(D1 / 2, D2 / 2], and a and b are constants.

[0120] In one embodiment of this utility model, the optical power variation curve of the semicircle corresponding to any radius r with respect to the angle conforms to the following formula (1).

[0121] (1)

[0122] Where r∈(D1 / 2, D2 / 2], , It is a constant. .

[0123] In one embodiment of this utility model, the optical power on the semicircle corresponding to any radius r changes with the angle according to the following formula (2).

[0124] (2)

[0125] Where r∈(D1 / 2, D2 / 2], , It is a constant. .

[0126] In one embodiment of this invention, within the annular width of the defocus zone, the radial optical power corresponding to any angle θ varies with the radius of the defocus zone. It is continuously differentiable, where θ∈(0°, 360°) and r∈(D1 / 2, D2 / 2).

[0127] In one embodiment of this invention, the contact lens 10 is a corneal contact lens or a scleral contact lens, and the diameter of the optical part of the corneal contact lens and the diameter of the optical part of the scleral contact lens are both 6-12 mm. Preferably, the contact lens 10 is a corneal contact lens, which can be a soft corneal contact lens, a rigid corneal contact lens, or a hybrid corneal contact lens. The rigid corneal contact lens includes a rigid non-permeable corneal contact lens, a rigid permeable corneal contact lens, or an orthokeratology lens. The corneal contact lens is preferably a contact lens.

[0128] In one specific embodiment of this utility model, the contact lens 10 is a progressive focal length contact lens with a diameter of 10.6 mm. The contact lens 10 is used by myopic patients to simultaneously slow the progression of myopia. The diameter of the optical part 1 of the contact lens 10 is 6.0 mm, and the vertex spherical power of the contact lens 10 is -6.0D. The rear surface 9 of the contact lens 10 is spherical, and the front surface 8 of the contact lens 10 is aspherical. Figure 1 As shown, the contact lens 10 of the prior art has a 360° rotationally symmetrical power distribution.

[0129] like Figure 2 As shown, Figure 2 The figure illustrates the relationship between the radius of the contact lens 10 and its optical power. For example... Figures 3 to 5 As shown, the optical power of the contact lens 10 changes continuously along the circumference of any radius envelope. In this embodiment, the optical power of any point on the optical part 1 of the contact lens 10 is greater than the optical power of the geometric center, or the optical power of some points on the optical part 1 is greater than the optical power of the geometric center, and the optical power of the remaining points is equal to the optical power of the geometric center. Figure 6 As shown, Figure 6 The text lists several radii (0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm) corresponding to the circumference of the circles, showing that the optical power as a function of angle is continuously differentiable and conforms to a sinusoidal trend. For example... Figure 7 and Figure 8 As shown, Figure 7 and Figure 8 The text lists several different angles (0°, 45°, 90°, 126°, 198°, 270°, 336°) and shows that the optical power variation curves with radius are not entirely the same. Furthermore, the optical power distribution trends with radius at the 90° and 270° radii are symmetrical about the geometric center. , where θ∈[0°, 180°), θ≠90, r∈(0, 3).

[0130] In this embodiment, the circular central region with a diameter of 2.0 mm is the central correction zone, and the annular region with a diameter of 2-6 mm is the defocus zone. The optical power at any angle in the defocus zone gradually increases with the radius, or the rate of change curve for optical power with the radius first increases and then decreases, and the rate of change is not zero. For example... Figure 8 As shown, the rate of change of optical power with radius is the same at different angles.

[0131] Furthermore, to facilitate positioning of the contact lens for external use, this embodiment also includes a peripheral area surrounding the outer periphery of the optical element, where a positioning structure and / or marking 3 are provided in a 270° direction. For example... Figure 9 As shown, the position of the positioning structure is basically the same as the position of mark 3. The positioning structure here usually refers to the thickness of the lower part of the lens (i.e., the direction of the lens towards the center of the earth after wearing) being increased to a certain extent, while the upper part of the lens is thinned. During the wearing process, the lens is subjected to gravity, and the thickest part is eventually kept at the bottom, forming a positioning effect. The thickened part is set outside the optical part of the contact lens.

[0132] In one specific embodiment of this utility model, the contact lens 10 is a progressive focal length contact lens with a diameter of 14.0 mm. The contact lens is used by myopic patients to simultaneously slow the progression of myopia. The diameter of the optical part is 8.0 mm, and the vertex spherical power of the contact lens is -6.0D. The rear surface of the contact lens is spherical, and the front surface is aspherical. Figure 10As shown, in the prior art, the contact lens has a 360° rotationally symmetrical power distribution. For example... Figure 11 As shown, the lens's , , , The curves showing the change in optical power as a function of radius at four angles are as follows: Figure 11 As shown. Figure 12 and Figure 13 As shown, the circumferential optical power variation of an arbitrary radius envelope is continuous.

[0133] In this embodiment, the optical power of any point on the contact lens optics is greater than the optical power of the geometric center, or the optical power of some points on the optics is greater than the optical power of the geometric center, and the optical power of the remaining points is equal to the optical power of the geometric center. For example... Figure 14 As shown, Figure 14 The text lists several radii (0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm) and shows that the circumferential optical power variation curves with angle are all continuously differentiable and conform to a sinusoidal function trend. For example... Figure 15 and Figure 16 As shown, Figure 15 and Figure 16 The curves showing the change in optical power with radius at several different angles (6°, 30°, 135°, 252°, 336°) are not entirely the same.

[0134] In this embodiment, the circular central region with a diameter of 1.8 mm is the central correction zone, and the annular region with a diameter of 1.8-8 mm is the defocus zone. The optical power at any angle in the defocus zone gradually increases with the radius, or the rate of change of optical power with the radius first increases and then decreases, and the rate of change is not zero. For example... Figure 17 As shown, the rate of change of optical power with radius at several different angles has the same trend.

[0135] In another specific embodiment of this utility model, the contact lens 10 is a progressive focal length contact lens with a diameter of 14 mm. The contact lens is used for myopic patients to simultaneously slow the progression of myopia. The diameter of the optical part of the contact lens is 8.0 mm, and the spherical power at the vertex of the contact lens is 0.0D. The rear surface of the contact lens is spherical, and the front surface of the contact lens is aspherical. Figure 18 As shown, the contact mirror in the prior art has a 360° rotationally symmetrical power distribution. For example... Figure 19 As shown, the optical part of the contact lens , Curves showing the change in optical power as a function of radius at several different angles. For example... Figure 20 and Figure 21 As shown, the circumferential optical power variation of an arbitrary radius envelope is continuous.

[0136] In this embodiment, the optical power of any point on the contact lens optics is greater than the optical power of the geometric center, or the optical power of some points on the optics is greater than the optical power of the geometric center, and the optical power of the remaining points is equal to the optical power of the geometric center. For example... Figure 22 As shown, Figure 22 The text lists several curves showing the variation of circumferential optical power with angle for radii (0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm), all of which are continuous, differentiable, and conform to a sinusoidal function trend. For example... Figure 23 and Figure 24 As shown, Figure 23 and Figure 24 The curves showing the change in optical power with radius at several different angles (6°, 30°, 135°, 252°, 336°) are not entirely the same.

[0137] In another specific embodiment of this utility model, such as Figure 25 and Figure 26 As shown, the contact lens 10 has an optical section 1 and a peripheral region 2. The optical section 1 is located at the center and is circular. The optical section 1 adopts the asymmetric defocusing structure described above. The peripheral region 2 is located on the outer periphery of the optical section 1 and is annular. The contact lens 10 has a posterior surface 9 facing the cornea of ​​the human eye. Figure 25 The lower surface of the middle contact lens 10 and the anterior surface 8 away from the human cornea Figure 25 The upper surface of the contact lens 10. The contact lens 10 has a tear channel 6 (shown by the shaded line in the figure). The tear channel 6 extends radially along the rear surface 9 or the front surface 8 of the contact lens 10, allowing tears to flow into the tear channel 6 from one end near the geometric center. Under the action of fluid dynamics, a force is generated on the contact lens 10 along the direction of the front surface 8 or the rear surface 9, causing the contact lens 10 to rotate. This allows the dynamic defocus performance of the contact lens 10 to be better utilized, thereby improving the myopia control effect.

[0138] With this structure, when wearing the contact lens 10, tears usually flow from the edge of the contact lens 10 to its geometric center. This flow is based on natural physiological function and is a continuous process, not entirely dependent on blinking. Therefore, whether it is day or night, whether the wearer is working, studying or sleeping (including any rest time such as lunch break), the flow of tears can be used to rotate the contact lens 10, thereby improving the applicability of the contact lens 10 technology.

[0139] Furthermore, the force generated by tears is gentler than that of the eyelids, thus allowing the contact lens 10 to rotate more stably and slowly, improving the safety of wearing it.

[0140] Furthermore, the cross-sectional area or width of the tear channel 6 can gradually change from one end to the other, thereby promoting hydrodynamics and enabling the contact lens 10 to rotate more reliably and stably. The dimension of the tear channel 6 extending along the rear surface 9 or the front surface 8 is called the length, the dimension in the thickness direction of the contact lens 10 is called the height, and the dimension in the direction perpendicular to the length direction of the tear channel 6 is called the width.

[0141] In this embodiment, the tear channel 6 has an opening on its rear surface 9, thereby forming a groove-like structure. Tear fluid flows into the groove-like structure through the opening and along the groove-like structure. By forming a groove-like structure with an opening, the thickness of the contact lens 10 can be effectively utilized to increase the volume of the tear channel 6, enhance the hydrodynamic effect, and enable the contact lens 10 to rotate reliably. At the same time, this design also facilitates the processing of the contact lens 10.

[0142] The radially outer end of the tear channel 6 is located at the edge of the contact lens 10. A port 7 communicating with the tear channel 6 is provided at the edge of the contact lens 10 at the end of the tear channel 6, allowing tears to flow into the tear channel 6 from the port 7, thus generating a large rotational torque. It should be noted that the tear channel 6 is located in the peripheral region 2 of the optical unit 1, which helps to suppress any adverse effects on the optical characteristics of the optical unit 1.

[0143] like Figure 25 and Figure 26 As shown, the tear channel 6 extends from the radially outer side (outer peripheral side) to the radially inner side (inner peripheral side or central side), which can accommodate the radial flow of tears and enable the tear flow to reliably exert force on the contact lens 10.

[0144] Because the optical unit 1 has asymmetric defocus optical characteristics, and the contact lens 10 rotates under the action of the self-rotating structure, the myopia defocus signal changes in the 360-degree direction (circumferential direction). This causes the stimulation received at different positions on the retina to change, preventing the effective stimulation received by the human eye from the long-term action of a fixed signal from gradually weakening (that is, preventing the human eye from developing "drug resistance" to the defocus signal). With this design, the contact lens 10 itself can slowly rotate under the action of tear film. In this way, the defocus signal stimulation received at different positions on the retina will change cyclically with the rotation of the contact lens 10, thereby achieving a long-term myopia control effect and breaking "drug resistance".

[0145] It should be noted that the front-to-back direction can also be referred to as the optical axis direction (the direction perpendicular to the axis of the front surface 8 or rear surface 9 at the center of the contact lens 10). In this embodiment, the optical part 1 is circular, but the shape of the optical part 1 is not limited to this; it can also be elliptical or other shapes. To promote tear flow, a through-hole penetrating the contact lens 10 in the thickness direction can be provided on the contact lens 10 to improve tear flow, for example, by providing a through-hole in the optical part 1 or the peripheral area 2.

[0146] like Figure 25 and Figure 26 As shown, in this embodiment, the contact lens 10 is a daily wear contact lens 10, such as a regular contact lens. The contact lens 10 is provided with two tear channels 6. Of course, the number of tear channels 6 is not limited to this; it can also be provided with only one, or three or more.

[0147] In another specific embodiment of this utility model, such as Figure 27 and Figure 28 As shown, the difference between this embodiment and the above embodiment is that the tear channel 6 is entirely inside the contact lens 10, that is, the tear channel 6 does not form an opening on the front surface 8 or the rear surface 9 of the contact lens 10, that is, the tear channel 6 is a closed channel.

[0148] The tear channel 6 is located in the peripheral region 2 of the contact lens 10. The tear channel 6 is closed on the inner (or outer) surface of the contact lens 10. The end of the tear channel 6 away from the geometric center has a port 7, which is located on the end face of the outer peripheral edge of the contact lens 10. The end of the tear channel 6 closest to the geometric center is closed; however, the end of the tear channel 6 closest to the geometric center can also have a port 7. Tears flow into the tear channel 6 through the port 7, thereby causing the contact lens 10 to rotate, thus achieving the same technical effect as in the above-described embodiment, which will not be described in detail here.

[0149] In another specific embodiment of this utility model, a closed channel can be formed by stacking two substrates together. In this case, one or both of the two opposing surfaces of the two substrates have grooves, and the two substrates can be joined together to form a closed channel. If the contact lens 10 is a contact lens, it can be integrally molded by molding. The male mold and female mold correspond to the rear surface 9 and front surface 8 of the lens, and the insert corresponds to the channel portion. After liquid injection curing, the mold and insert can be removed.

[0150] In another specific embodiment of this utility model, such as Figure 29 and Figure 30As shown, the contact lens 10 has a tear channel 6 in the peripheral region 2. The tear channel 6 extends radially from the outer peripheral edge of the contact lens 10 to the edge of the optical part 1, and is partially crescent-shaped when viewed from the front-rear direction. Specifically, a first sidewall 4 and a second sidewall 5 are disposed opposite each other in the tear channel 6. Both the first sidewall 4 and the second sidewall 5 extend along the length direction of the tear channel 6. The distance between the first sidewall 4 and the second sidewall 5 gradually decreases in the radially inward direction. The first sidewall 4 and the second sidewall 5 have the same curvature, and the curvature of the first sidewall 4 is greater than that of the second sidewall 5, thus making the tear channel 6 partially crescent-shaped.

[0151] Figure 30 The first sidewall 4, which has a greater degree of curvature, is located counterclockwise from the second sidewall 5, thus facilitating the contact mirror 10's orientation. Figure 30 The contact mirror 10 can rotate clockwise; that is, by setting the first sidewall 4 and the second sidewall 5 to different degrees of curvature, the rotation direction of the contact mirror 10 can be controlled.

[0152] In this embodiment, the tear channel 6 can be an open channel (i.e., an opening communicating with the tear channel 6 is provided on the front surface 8 or the rear surface 9 of the contact lens 10) or a closed channel. When the tear channel 6 is an open channel, the two ends of the tear channel 6 have ports 7 (i.e., a radially inner port 7 and a radially outer port 7), and the tear channel 6 extends in a curved manner so that the two ports 7 are located at different positions in the circumferential direction.

[0153] In this embodiment, the first sidewall 4 and the second sidewall 5 bend in the same direction, and the distance between the first sidewall 4 and the second sidewall 5 gradually decreases in the radial inward direction. Of course, the tear channel 6 can also have one or two sidewalls extending in a straight line, and their extension direction can be completely consistent with the radial direction, or it can extend at an angle relative to the radial direction.

[0154] In another specific embodiment of this utility model, such as Figures 31 to 34 As shown, the difference in expenditure from the above embodiment is that, Figure 31 The contact lens 10 is equipped with two tear channels 6. Figure 32 The contact lens 10 is equipped with three tear channels 6. Figure 33 The contact lens 10 is equipped with four tear channels 6. Figure 34 The contact lens 10 has six tear channels 6, which are evenly spaced in the circumferential direction. Of course, the distribution of the tear channels 6 is not limited to this and can also be uneven.

[0155] In another specific embodiment of this utility model, such as Figure 35As shown, the difference between this embodiment and the above embodiment is that the bending direction of the tear channel 6 is different. Specifically, among the two side walls of the tear channel 6 arranged opposite each other in the circumferential direction, the bending degree of the side wall in the clockwise direction is greater than that of the side wall in the counterclockwise direction. That is, the bending degree of the right side wall is greater than that of the left side wall, so that the contact lens 10 can rotate in the counterclockwise direction.

[0156] In another specific embodiment of this utility model, such as Figure 36 and Figure 37 As shown, the difference between this embodiment and the previous embodiment is that the shape of the tear channel 6 in this embodiment is different from that in the previous embodiment. The tear channel 6 in this embodiment is V-shaped. Specifically, the contact lens 10 has a tear channel 6 in the peripheral region 2. The tear channel 6 extends from the edge of the contact lens 10 towards the defocus area and then away from the defocus area; that is, the tear channel 6 extends radially outward to radially inward and then turns back to extend radially outward, thus forming a V-shaped tear channel 6. Tears flow into the tear channel 6 through the port 7, causing the contact lens 10 to rotate under the action of fluid mechanics. Of course, the shape of the tear channel 6 is not limited to V-shape; it can also be C-shaped or U-shaped.

[0157] In another specific embodiment of this utility model, the tear channel 6 extends from the outer peripheral edge of the contact lens 10 to the outer peripheral edge of the optical part 1, or extends to the junction of the peripheral area 2 and the optical part 1, thereby forming a channel as long as possible so that the contact lens 10 can rotate.

[0158] In another specific embodiment of this utility model, such as Figure 37 As shown, the tear channel 6 has two ports 7 at different positions on the outer peripheral edge of the contact lens 10. The cross-sectional area or cross-sectional width of the tear channel 6 gradually decreases from one end to the other, thereby enhancing the force exerted on the contact lens 10 and reliably causing the contact lens 10 to rotate.

[0159] The cross-sectional area or width of the tear channel 6 gradually decreases from the counterclockwise end to the clockwise end, that is, from the left end to the right end, thus allowing the contact lens 10 to rotate clockwise. The larger portion of the cross-sectional area or width is located on the counterclockwise side, and the smaller portion is located on the clockwise side, which enables the contact lens 10 to rotate clockwise.

[0160] In another specific embodiment of this utility model, such as Figure 38 and Figure 41 As shown, the difference between this embodiment and the above embodiments is that... Figure 38The contact lens 10 is equipped with two tear channels 6. Figure 39 The contact lens 10 is equipped with three tear channels 6. Figure 40 The contact lens 10 is equipped with four tear channels 6. Figure 41 The contact lens 10 has six tear channels 6, which are evenly spaced in the circumferential direction. Of course, the distribution of the tear channels 6 is not limited to this and can also be uneven.

[0161] In another specific embodiment of this utility model, such as Figure 42 As shown, the difference between this embodiment and the previous embodiment lies in the direction of change of the cross-sectional area or cross-sectional width of the tear channel 6. Specifically, the tear channel 6 has two ends at the outer peripheral edge of the contact lens 10, and the cross-sectional area or cross-sectional width of the tear channel 6 gradually decreases from the clockwise end to the counterclockwise end. This arrangement allows the contact lens to rotate counterclockwise. The cross-section of the tear channel 6 is square, triangular, circular, or regular pentagonal.

[0162] In another specific embodiment of this utility model, such as Figure 43 As shown, the difference between this embodiment and the above embodiment is that the cross-sectional area or cross-sectional width of the tear channel 6 in this embodiment changes in stages, presenting a stepped shape with stepped end faces.

[0163] In another specific embodiment of this utility model, such as Figure 44 As shown, the difference between this embodiment and the above embodiment is that the cross-sectional area or cross-sectional width of the tear channel 6 in this embodiment changes in stages, presenting a stepped shape with stepped end faces.

[0164] In another specific embodiment of this utility model, such as Figure 45 As shown, the difference between this embodiment and the above embodiment is that the cross-sectional area or cross-sectional width of the tear channel 6 in this embodiment changes continuously along the length direction of the tear channel 6.

[0165] In another specific embodiment of this utility model, such as Figure 46 As shown, the difference between this embodiment and the above embodiment is that the cross-sectional area or cross-sectional width of the tear channel 6 in this embodiment changes in stages, presenting a stepped shape with a transition slope.

[0166] The contact lens of this invention is not limited to contact lenses and orthokeratology lenses. The contact lens can be a scleral contact lens or a corneal contact lens. The corneal contact lens can be a soft corneal contact lens, a rigid corneal contact lens, or a hybrid corneal contact lens. Among them, rigid corneal contact lenses include rigid non-permeable corneal contact lenses, rigid permeable corneal contact lenses, or orthokeratology lenses.

[0167] This invention also provides a contact lens assembly, which includes at least two extraocular contact lenses as described above. Specifically, the number of contact lenses in the assembly can be 2 to 365 or 2 to 7. Preferably, the contact lenses are contact lenses. The contact lenses are daily disposable, weekly disposable, semi-monthly disposable, monthly disposable, quarterly disposable, semi-annual disposable, or yearly disposable. Preferably, the contact lenses are daily disposable.

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit of the technical solutions of the embodiments of this utility model.

Claims

1. An external contact lens, characterized in that, The contact lens includes an optical section and a peripheral area surrounding the optical section. The optical section includes a central correction zone centered on the geometric center of the contact lens and a defocus zone surrounding the central correction zone. The central correction zone has a prescription optical power for correcting visual acuity, which is adapted to the degree of correction required by the wearer. The optical power of the defocus zone is greater than or equal to the optical power of the central correction zone, and the optical power distribution along the radius of the defocus zone has different trends at at least two angles. The peripheral area is provided with a self-rotating structure for automatically rotating the contact lens.

2. The eyewear according to claim 1, wherein, The self-rotating structure includes a tear channel disposed in the peripheral region, the tear channel being located on the front or rear surface of the contact lens, and the tear channel extending radially along the contact lens.

3. The eyewear according to claim 2, wherein, The cross-sectional area or width of the tear channel gradually decreases from the first end to the second end of the tear channel.

4. The eyewear according to claim 2, wherein, At least one of the first and second ends of the tear channel forms a port at the edge of the contact lens.

5. The eyewear according to claim 2, wherein, The first and second ends of the tear channel are located at different positions in the circumferential direction of the contact lens.

6. The eyewear according to claim 2, wherein, The tear channel extends from the edge of the contact lens first toward the defocused area, and then toward the defocused area.

7. The external contact lens according to claim 6, characterized in that, The tear channels are V-shaped, C-shaped, or U-shaped.

8. The external contact lens according to claim 6, characterized in that, The tear channel has opposing first and second sidewalls, both of which extend along the length of the tear channel.

9. The eyewear according to claim 8, wherein, The first sidewall and the second sidewall have the same bending direction, and the curvature of the first sidewall is greater than that of the second sidewall.

10. The ocular outerwear contact lens of any one of claims 2 to 9, wherein, The self-rotating structure includes multiple tear channels, which are arranged at circumferential intervals along the contact lens.

11. The ocular outerwear contact lens of any one of claims 2 to 9, wherein, At least a portion of the tear channel is a groove-like structure disposed on the rear surface of the contact lens.

12. The ocular outerwear contact lens of any one of claims 2 to 9, wherein, At least a portion of the tear channel is located inside the contact lens.

13. The ocular outerwear contact lens of any one of claims 2 to 9, wherein, The cross-sectional area or cross-sectional width of the tear channel varies continuously or in stages along the length of the tear channel.

14. The ocular outerwear contact lens of any one of claims 2 to 9, wherein, At least a portion of the tear channel extends radially along the contact lens.

15. The ocular outerwear contact lens of any one of claims 2 to 9, wherein, At least a portion of the tear channel has a cross-sectional area or cross-sectional width that gradually decreases in the radial inward direction along the contact mirror.

16. The extraocular contact lens according to any one of claims 1 to 9, characterized in that, The diameter of the optical part is 7-12mm, and the diameter of the central correction area is 1.5-3.5mm.

17. The ocular outerwear contact lens of any one of claims 1 to 9, wherein, Within the annular width of the defocused region, the curve showing the change in optical power as a function of angle on the circumference corresponding to any radius r. Continuously differentiable, where θ∈[0°, 360°), r∈(D1 / 2, D2 / 2], D1 is the inner diameter of the defocused region, and D2 is the outer diameter of the defocused region.

18. The ocular outerwear contact lens of any one of claims 1 to 9, wherein, The defocused region has a non-continuous optical power variation curve with radius at at least one angle.

19. The ocular outerwear contact lens of any one of claims 1 to 9, wherein, The optical power at any angle in the defocused area gradually increases with the radius, or the rate of change of optical power at any angle in the defocused area with the radius is continuous and first increases and then decreases, and the rate of change is not 0.

20. The ocular outerwear contact lens of any one of claims 1 to 9, wherein, The optical power at any angle in the defocused area gradually increases with the radius, or the rate of change of optical power at any angle in the defocused area with the radius is continuous and first increases and then decreases, eventually tending to a uniform speed, and the rate of change is not 0.

21. The ocular outerwear contact lens of any one of claims 1 to 9, wherein, The defocused region has at least one angle where the rate of change of optical power with radius is discontinuous.

22. The ocular outerwear contact lens of any one of claims 1 to 9, wherein, Within the annular width of the defocused region, there are at least two angles θ1 and θ2, and the radial optical power curve corresponding to angle θ1 varies with the radius. Curve of radial optical power as a function of radius corresponding to angle θ2 They are not the same, where θ1∈[0°, 360°), θ2∈[0°, 360°), and r∈(D1 / 2, D2 / 2).

23. The ocular outerwear contact lens of any one of claims 1 to 9, wherein, Within the annular width of the defocused region, there is at least one curve showing the change in optical power as a function of angle on the circumference corresponding to a radius r1. It is not a constant value, where θ∈[0°, 360°) and r1∈(D1 / 2, D2 / 2).

24. The ocular-wear contact lens of any one of claims 1 to 9, wherein, A sector with one vertex coinciding with the geometric center, where the optical power varies with angle on any circle corresponding to r within the sector, follows the trend of a sine function.

25. The ocular outerwear contact lens of any one of claims 1 to 9, wherein, Within the annular width of the defocused region, on at least one diameter passing through the geometric center, the optical power distribution trends of the two radii are not the same; on the remaining diameters passing through the geometric center, the optical power distribution trends of the two radii are symmetrical about the geometric center. , θ∈[0°, 360°), r1∈(D1 / 2, D2 / 2], and θ is not equal to the direction of the diameter where the optical power distribution trend is different.

26. The ocular outerwear contact lens of any one of claims 1 to 9, wherein, Within the annular width of the defocused zone, the optical power variation curves with radius are different for any angles θ1 and θ2, i.e. Where θ1∈[0°, 360°), θ2∈[0°, 360°), r∈(D1 / 2, D2 / 2).

27. The ocular outerwear contact lens of any one of claims 1 to 9, wherein, The trend of optical power variation with angle on a semicircle corresponding to any radius r conforms to... , where θ∈(0°, 180°), r∈(D1 / 2, D2 / 2], and a and b are constants.

28. The extraocular contact lens according to any one of claims 1 to 9, characterized in that, The curve of optical power on a semicircle with arbitrary radius r as a function of angle conforms to the following formula (1); （1） where r e (D1 / 2, D2 / 2], , is a constant, .

29. The ocular outerwear contact lens of any one of claims 1 to 9, wherein, The trend of optical power on a semicircle with any radius r as a function of angle conforms to the following formula (2); （2） where r e (D1 / 2, D2 / 2], , is a constant, .

30. The ocular outerwear contact lens of any one of claims 1 to 9, wherein, The curve showing the change in radial optical power at any angle θ with the radius of the defocused area within the annular width of the defocused area. It is continuously differentiable, where θ∈(0°, 360°) and r∈(D1 / 2, D2 / 2).

31. The ocular outerwear contact lens of any one of claims 1 to 9, wherein, The contact lens is a corneal contact lens or a scleral contact lens, and the diameter of the optical part of the corneal contact lens and the diameter of the optical part of the scleral contact lens are both 6-12mm.

32. A contact lens assembly characterized by, Includes at least two external contact lenses as described in any one of claims 1 to 31, wherein the contact lenses are daily disposable, weekly disposable, semi-monthly disposable, monthly disposable, quarterly disposable, semi-annual disposable, or annual disposable.

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