Contact lens
By designing tear channels on the contact lenses, allowing them to rotate using the flow of tears, the problem of existing contact lenses being unable to rotate during sleep is solved, achieving effective myopia control all day long and improving the safety and comfort of wearing them.
Patent Information
- Application Number
- CN202520592908.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-03-31
AI Technical Summary
Existing contact lenses cannot effectively utilize the rotational effect caused by blinking during sleep, limiting their applicability to time and scenarios.
Design a contact lens with a tear channel extending radially along the lens, utilizing the natural flow of tears to rotate the lens, ensuring effective operation at any time.
It improves the applicability of contact lenses, allowing the lenses to rotate both day and night, enhancing the safety and comfort of wearing them, and avoiding the inconvenience caused by restricted blinking.
Smart Images
Figure CN223911133U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a contact lens for ophthalmology. BACKGROUND
[0002] Current contact lenses for myopia prevention and control include two types, one is daily wear type, such as contact lenses, which have myopic defocus optical design, and external light passes through such optical design to the retina of the human eye to produce stimulation to delay the growth of myopia; the other is night wear type, which can reshape the cornea, and the reshaped cornea has myopic defocus optical effect, so that after the lens is removed in the daytime, external light passes through the reshaped cornea to stimulate the retina of the human eye to achieve the effect of delaying the growth of myopia, such as orthokeratology lenses. Both types of lenses are matched with the shape of the cornea by matching the surface shape of the entire or partial back surface of the lens with the shape of the cornea to achieve the centering of the lens. During wearing, the lens usually only moves slightly in the up and down direction, that is, the lens does not move relative to the eyeball after wearing.
[0003] However, there is a technology in the prior art that uses blinking to drive the lens to rotate, thereby achieving better myopia prevention and control effect.
[0004] However, since people do not blink when they sleep, this technology cannot be well applied when the wearer is sleeping or for night wear contact lenses, that is, the application of this technology is limited by time, scene, etc. CONTENT OF THE UTILITY MODEL
[0005] Therefore, the purpose of the utility model is to provide a contact lens technology with better applicability.
[0006] To achieve the above purpose, the utility model provides a contact lens, which includes a back surface facing the eyeball when worn and a front surface opposite to the back surface, and further includes a tear channel, which extends along the back surface or the front surface in the radial direction of the contact lens.
[0007] With the above structure, the contact lens can be rotated by using tears, whether it is daytime or nighttime, whether the wearer is in an eye-using state such as work or study or is in a sleep and rest state (including rest at any time such as lunch break), the contact lens can be rotated by using the flow of tears, thereby improving the applicability of the contact lens technology.
[0008] In addition, the force of tears is more gentle than the force of eyelids, so that the rotation of the lens is more stable and slow, and the safety of wearing is improved.
[0009] As a possible implementation, the cross-sectional area or cross-sectional width of the tear channel decreases from the first end side to the second end side.
[0010] Thus, the fluid dynamics can be facilitated by the varying cross-sectional area or width, to reliably and stably rotate the contact lens.
[0011] As one possible implementation, the first end of the tear fluid passage is open at the outer peripheral edge portion of the contact lens. Thus, the tear fluid can be introduced into the tear fluid passage from the outer peripheral edge portion of the contact lens, to form a large rotational moment, to reliably rotate the contact lens.
[0012] As one possible implementation, the first end of the tear fluid passage is open at the end surface of the outer peripheral edge portion of the contact lens, or at the back surface of the outer peripheral edge portion of the contact lens.
[0013] As one possible implementation, the second end of the tear fluid passage is open at a position radially inside the first end of the contact lens.
[0014] As one possible implementation, including an optical zone and a peripheral zone located around the optical zone, the tear fluid passage is provided in the peripheral zone.
[0015] Thus, the tear fluid passage portion can be inhibited from adversely affecting the optical characteristics.
[0016] As one possible implementation, the first end and the second end of the tear fluid passage are different in position in the circumferential direction of the contact lens.
[0017] Thus, the contact lens can be reliably driven to rotate in the circumferential direction.
[0018] As one possible implementation, the tear fluid passage extends from the radially outer side to the radially inner side of the contact lens, and then turns back.
[0019] The tear fluid generally flows from the radially inner side to the radially outer side of the contact lens, and then turns back to flow out, and thus, by providing such a turn-back passage, the contact lens can be reliably and stably rotated.
[0020] As one possible implementation, the tear fluid passage turns back in a V-shape, a C-shape, or a U-shape.
[0021] As one possible implementation, the first end and the second end of the tear fluid passage are open at the outer peripheral edge portion of the contact lens.
[0022] Thus, a tear fluid passage as long as possible can be formed, to reliably rotate the contact lens.
[0023] As one possible implementation, the tear fluid passage has a first side wall and a second side wall opposite in the circumferential direction along the back surface or the front surface, and the distance between the first side wall and the second side wall increases toward the radially outer side.
[0024] As one possible implementation, the first side wall is curved to extend, and the second side wall is curved to extend with a smaller degree of curvature than the first side wall, the concave-convex directions of the two curved walls being the same.
[0025] Thus, not only can the contact lens be reliably rotated, but also the direction of rotation of the contact lens can be set by the structure in which the two side walls have different degrees of curvature.
[0026] As one possible implementation, the tear fluid passage has a plurality of tear fluid passages arranged in the circumferential direction of the contact lens.
[0027] Thus, the contact lens can be reliably and stably rotated.
[0028] As one possible implementation, a part or all of the tear fluid passage is constituted by a long groove that is open on the back surface of the contact lens. Thus, effects such as ease of production can be obtained.
[0029] As one possible implementation, a part or all of the tear fluid passage is constituted by a closed passage that is closed on the front surface and the back surface of the contact lens.
[0030] As one possible implementation, the optical zone has different optical properties in different radial directions.
[0031] As one possible implementation, the optical properties include the amount of defocus, the radius of curvature, and the imaging interference properties.
[0032] As one possible implementation, the cross-sectional area and / or the cross-sectional width of the tear fluid passage continuously or stepwise vary.
[0033] As one possible implementation, the cross section of the tear fluid passage is circular or polygonal.
[0034] As one possible implementation, the contact lens is a corneal molding lens, including a base curve zone as an optical zone and a peripheral zone located on the periphery of the base curve zone.
[0035] As one possible implementation, the peripheral zone includes, in order toward the radial outside, a reverse curve zone and a positioning curve zone, and the tear fluid passage is provided at least in the positioning curve zone.
[0036] As one possible implementation, the tear fluid passage is open in the reverse curve zone.
[0037] As one possible implementation, the contact lens further includes a limbal curve zone located on the outer periphery of the positioning curve zone, and the tear fluid passage is open in the limbal curve zone.
[0038] As one possible implementation, the contact lens can be a contact lens.
[0039] As one possible implementation, the optical zone of the contact lens has a diameter of 6-10 mm.
[0040] As one possible implementation, the tear fluid channel extends radially obliquely with respect to the contact lens.
[0041] The cross-sectional area or the cross-sectional width of the tear fluid channel decreases from the radially outer side to the radially inner side of the contact lens. BRIEF DESCRIPTION OF DRAWINGS
[0042] The various technical features of the present application and the relationships between them will be further illustrated below with reference to the accompanying drawings. The drawings are exemplary, some technical features are not shown in actual proportion, and some technical features in the drawings can be omitted, which are conventional in the technical field to which the present application belongs and are not essential for understanding and implementing the present application, or additional technical features are shown, which are not essential for understanding and implementing the present application, that is, the combination of various technical features shown in the drawings is not used to limit the present application. In addition, throughout the present application, the same reference signs refer to the same contents. The specific drawings are as follows:
[0043] Figure 1 is a cross-sectional view of a contact lens according to an embodiment of the present application;
[0044] Figure 2 is a partial enlarged view of Figure 1 ;
[0045] Figure 3 is a cross-sectional view of a contact lens according to an embodiment of the present application;
[0046] Figure 4 is a partial enlarged view of Figure 3 ;
[0047] Figure 5 is a cross-sectional view of a contact lens according to an embodiment of the present application;
[0048] Figure 6 is a partial enlarged view of Figure 5 ;
[0049] Figure 7 is a cross-sectional view of a contact lens according to an embodiment of the present application;
[0050] Figure 8 is a partial enlarged view of Figure 7 ;
[0051] Figure 9 is a cross-sectional view of a contact lens according to an embodiment of the present application;
[0052] Figure 10 is Figure 9 is a diagram illustrating a tear duct structure in
[0053] Figure 11 is a structural diagram of a contact lens according to an embodiment of the present application;
[0054] Figure 12 is a structural diagram of a contact lens according to an embodiment of the present application;
[0055] Figure 13 is a structural diagram of a contact lens according to an embodiment of the present application;
[0056] Figure 14 is a structural diagram of a contact lens according to an embodiment of the present application;
[0057] Figure 15 is a structural diagram of a contact lens according to an embodiment of the present application;
[0058] Figure 16 is a structural diagram of a contact lens according to an embodiment of the present application;
[0059] Figure 17 is Figure 16 is a diagram illustrating a tear duct structure in
[0060] Figure 18 is a structural diagram of a contact lens according to an embodiment of the present application;
[0061] Figure 19 is a structural diagram of a contact lens according to an embodiment of the present application;
[0062] Figure 20 is a structural diagram of a contact lens according to an embodiment of the present application;
[0063] Figure 21 is a structural diagram of a contact lens according to an embodiment of the present application;
[0064] Figure 22 is a structural diagram of a contact lens according to an embodiment of the present application;
[0065] Figure 23a - Figure 23d is a diagram illustrating several cross-sectional examples of a tear duct according to an embodiment of the present application;
[0066] Figure 24 is a diagram illustrating a channel structure according to an embodiment of the present application;
[0067] Figure 25This is an explanatory diagram of a channel structure according to one embodiment of the present invention;
[0068] Figure 26 This is a three-dimensional illustration of the channel size variation pattern according to one embodiment of the present invention;
[0069] Figure 27 A perspective illustration of the channel size variation pattern according to one embodiment of this utility model. Detailed Implementation
[0070] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings.
[0071] Figure 1 This is a cross-sectional schematic diagram of a contact mirror according to one embodiment of the present invention; Figure 2 yes Figure 1 A magnified view of a portion of the image.
[0072] Reference Figure 1 , Figure 2 The contact lens 10 has an optical area 1 and a peripheral area 2. The optical area 1 is located in the center and is circular, while the peripheral area 2 is located on the outer periphery of the optical area 1 and is annular. The contact lens 10 has a posterior surface 10a that faces the eyeball when worn. Figure 1 (lower middle surface) and the front surface 10b opposite to the rear surface Figure 1 (Upper and middle surface). Prescribed structures can be formed on the rear surface of optical zone 1, such as the design of the radius of curvature, the design of annular surfaces, and the design of defocus, thereby giving optical zone 1 prescribed optical characteristics to achieve purposes such as eye correction. Optical zone 1 is not limited to being designed on the rear surface to have specific optical characteristics; it can also be designed on the front surface or lens material, such as image interference design.
[0073] The contact lens 10 has a tear channel 31 (shown by the shaded line in the figure). The tear channel 31 extends radially along the rear or front surface of the contact lens 10, allowing tears to flow from the radially outer side (outer peripheral side) to the radially inner side (inner peripheral side, center side) into the tear channel 31. Under the action of fluid dynamics, a force is generated on the contact lens 10 along the direction of the front or rear surface, causing it to rotate. This allows the contact lens 10 to perform better, such as improving the control effect of myopia.
[0074] With such a structure, when the contact lens is worn, tears generally flow from the lens edge toward the lens center (and out to the peripheral side), and such flow is based on natural physiological mechanisms and is a continuous process that does not necessarily rely on blinking movements, and thus the contact lens 10 can be rotated using the flow of tears regardless of whether it is day or night, and regardless of whether the wearer is in an eye-using state such as work or study, or in a resting state such as sleep (including rest at any time such as a midday break), and thus the applicability of contact lens technology is improved.
[0075] In addition, tears are produced with a force that is gentler than the force of the eyelids, and thus the rotation of the lens can be made more stable and slow, and the safety of wearing can be improved.
[0076] In addition, the cross-sectional area or the cross-sectional width of the tear channel can gradually change from one end to the other end, and thus the fluid mechanics can be promoted to make the contact lens rotate more reliably and stably. Regarding the cross-sectional width, the dimension of the tear channel extending along the back surface 10a or the front surface 10b is referred to as the length, the dimension in the thickness direction of the contact lens 10 is referred to as the height, and the dimension in the width direction having the width along the back surface 10a or the front surface 10b, or the direction perpendicular to the length direction and the height direction, is referred to as the width.
[0077] In the present embodiment, the tear channel 31 is constituted by a long groove that is open (open) on the back surface 10a. Tears can flow into the long groove from the radially outer side and flow along the long groove. By forming the long groove as open, the thickness dimension of the contact lens 10 can be effectively utilized, the volume of the tear channel 31 can be increased, the fluid mechanics can be improved, and the contact lens 10 can be reliably rotated. In addition, processing can be facilitated.
[0078] In addition, the end portion of the tear channel 31 on the radially outer side is provided at the outer peripheral edge portion of the contact lens 10, and thus it can be said that the tear channel 31 (end portion) is open at the outer peripheral edge portion of the contact lens 10. Thus, tears can flow into the tear channel 31 from the outer peripheral edge portion of the contact lens 10, and a large rotational torque can be formed.
[0079] In addition, in the present embodiment, the tear channel 31 is provided in the peripheral area 2 around the optical area 1. In this way, adverse effects on the optical properties and the like of the optical area 1 can be suppressed.
[0080] Reference Figure 1 , Figure 2 The tear channel 31 extends from the radially outer side (peripheral side) to the radially inner side (inner peripheral side, central side), and thus the flow of tears in the radial direction can be conformed to, and the flow of tears can reliably generate a force on the contact lens 10.
[0081] In addition, in the present embodiment, the optical zone 1 has different optical properties in different meridian directions, for example, different radii of curvature, different amounts of myopic defocus, and different transmittances. In this way, in combination with the rotation of the contact lens 10, the myopic defocus signal changes in the 360-degree direction (circumferential direction), and the stimulation obtained by each position on the retina changes, so as to avoid the effective stimulation obtained by the human eye under the long-term action of a fixed signal from gradually weakening (i.e., to avoid the human eye developing "tolerance" to the defocus signal). That is, by using the present embodiment, the contact lens 10 itself can slowly rotate under the action of tears, so that the defocus signal stimulation obtained by different positions on the retina changes repeatedly with the rotation of the contact lens, thereby achieving a long-term myopia control effect and breaking the "tolerance".
[0082] Here, the "different meridian directions" can also be referred to as different diameter directions (different radial directions) in the front-rear direction.
[0083] In addition, the front-rear direction can also be referred to as the optical axis direction (the direction of the axis perpendicular to the front surface or the rear surface at the center of the contact lens).
[0084] In the above description, the optical zone 1 is circular, but the present application is not limited thereto, and can also be other shapes, such as an oval shape.
[0085] In addition, the contact lens of the present embodiment is a daily-wear contact lens, such as a soft contact lens.
[0086] Further, in the present embodiment, the contact lens 10 is a soft contact lens. Figure 1 、 Figure 2 In the present embodiment, two tear channels 31 are shown, but the present application is not limited thereto, and there can be only one or more than two.
[0087] Figure 3 is a cross-sectional view of a contact lens according to an embodiment of the present application; Figure 4 is an enlarged view of a portion of Figure 3 .
[0088] The main difference between the present embodiment and the above-described embodiment is that, in the above-described embodiment, the tear channel 31 is formed by a long groove that is open on the rear surface 10a, while in the present embodiment, the tear channel 33 is formed by a closed channel that is closed on the inner surface 10a (and the outer surface 10b). The other structures are basically the same, and the same reference numerals are added, and the description thereof is simplified or omitted (the same applies below).
[0089] As shown in Figure 3 、 Figure 4As shown, the contact lens 10 has a tear fluid passage 33 in the peripheral zone 2, which is closed on the inner surface 10a (and the outer surface 10b) of the contact lens 10, and has an opening 30a (also called a port) at one end thereof, which is open on the end surface of the outer peripheral edge of the contact lens 10. The other end of the tear fluid passage 33 is closed (for example, formed in a later-described meniscus shape), or can also be open (for example, formed in a later-described V shape).
[0090] With the present embodiment, the tear fluid can flow into the tear fluid passage 33 via the opening 30a, thereby rotating the contact lens 10, and the same technical effects as those of the above-described embodiment are obtained, and thus detailed description thereof will not be repeated.
[0091] In addition, as a method of forming a closed passage, for example, the lens can be formed by laminating two substrates together, and recesses can be formed on one or both of the opposite surfaces of the two substrates, and then the two substrates can be butted to form the closed passage. Alternatively, the lens can be integrally formed by molding, that is, a male mold and a female mold correspond to the rear surface and the front surface of the lens, and an insert corresponds to the passage portion, and after injection and curing, the mold and the insert are removed.
[0092] As Figure 1 the embodiment shown and Figure 3 the modified example of the embodiment shown, a part of the tear fluid passage can be constituted by an open long groove, and the other part can be constituted by a closed passage.
[0093] Figure 5 is a cross-sectional view of a contact lens according to an embodiment of the present application; Figure 6 is Figure 5 a partial enlarged view thereof.
[0094] The present embodiment differs from Figure 1 , Figure 2 the embodiments shown in that, in Figure 1 the embodiment, the contact lens is a contact lens as a daily-wear contact lens, and in the present embodiment, the contact lens is a corneal molding lens as a night-wear contact lens.
[0095] Referring to Figure 5 , Figure 6 the contact lens 10A is a corneal molding lens, which has an optical zone (base curve zone) 1A, and an inverse curve zone 4, a positioning curve zone 5, and a peripheral curve zone 6 located successively outward from the periphery of the optical zone 1A, and here the inverse curve zone 4, the positioning curve zone 5, and the peripheral curve zone 6 correspond to the peripheral zone arranged at the periphery of the optical zone 1A.
[0096] The contact lens 10A has a tear channel 34 extending in the radial direction of the contact lens 10A. In addition, the tear channel 34 is provided in the positioning arc region 5 and is constituted by a long groove open on the back surface. The tear channel 34 is adjacent to the reverse arc region 4 and the edge arc region 6, and extends from the boundary between the positioning arc region 5 and the edge arc region 6 to the boundary between the positioning arc region 5 and the reverse arc region 4.
[0097] With the structure of the present embodiment, the tear fluid can enter the tear channel 34, and the contact lens 10A can be caused to rotate under the action of fluid mechanics. Thus, even a contact lens 10A for night wear can reliably be caused to rotate, thereby improving the prevention and control effect of myopia and the like.
[0098] The structure of the orthokeratology lens of the present embodiment will be briefly described below.
[0099] The orthokeratology lens is a special contact lens, and the principle thereof is that the lens reshapes the cornea, thereby changing the optical properties of the cornea itself. The orthokeratology lens is generally constituted by several concentric arc regions, for example, as described above, and is divided into an optical region (base arc region) 1A, a reverse arc region 4, a positioning arc region 5, and an edge arc region 6. The optical region 1A (base arc region) functions as a mold to reshape the cornea into the shape of a base arc. In the present embodiment, the optical region 1A is designed to have different radii of curvature (optical powers) in different meridional directions. The reverse arc region 4 does not contact the cornea, and a tear fluid storage region is provided therebetween. The edge arc region 6 is raised to allow the tear fluid to flow into the space between the lens and the eyeball. The positioning arc region 5 contacts the cornea, and the arc segment of the lens of the positioning arc region 5 matches the shape of the cornea, thereby achieving the central positioning of the lens.
[0100] The overall shape of the tear channel provided in the positioning arc region 5 can be a channel having a "V" shape or a meniscus shape as described later, and the tear fluid can enter the channel from the edge of the lens. The cross-sectional area of the tear channel can be varied, and the area at one end can be larger than the area at the other end, thereby producing a good fluid mechanical effect to cause the lens to rotate under the action of fluid mechanics. In addition, the area variation can be uniform and gradual or can be stepwise, and the uniform and gradual variation is preferable.
[0101] In addition, the orthokeratology lens is not limited to the above-described zoned structure, and for example, the edge arc region 6 can be omitted.
[0102] Figure 7 is a cross-sectional view of a contact lens according to an embodiment of the present application; Figure 8 is Figure 7 is an enlarged view of a part of
[0103] The present embodiment differs from the embodiment shown in Figure 5 mainly in that Figure 5The tear fluid passage in the above embodiment is mainly composed of an open long groove. The tear fluid passage in the present embodiment is mainly composed of a closed passage.
[0104] Referring to Figure 7 , Figure 8 , the contact lens 10A has a tear fluid passage 35 mainly provided in the positioning arc region 5, and having an opening 30a at one end and an opening 30b at the other end, the opening 30a at one end being open at the back surface of the edge arc region 6, and the opening 30b at the other end being open at the back surface of the reverse arc region 4, that is, the tear fluid passage 35 extends from the edge arc region 6 to the reverse arc region 4. In this way, tear fluid can flow from the edge arc region 6 into the tear fluid passage 35, flow in the tear fluid passage 35, and flow out to the reverse arc region 4 where the tear fluid is stored without contacting the cornea.
[0105] The same technical effects as those of the above embodiment can also be obtained by using the present embodiment, which will not be described here.
[0106] Some embodiments mainly related to the shape of the tear fluid passage will be described below. It can be understood that these embodiments can be combined with the embodiments described above.
[0107] Figure 9 is a structural schematic diagram of a contact lens involved in an embodiment of the present application, which is obtained from the perspective of the back side; Figure 10 is Figure 9 an explanatory diagram of the passage structure in the above embodiment.
[0108] As shown in Figure 9 , Figure 10 , the contact lens 10 has a tear fluid passage 31 in the peripheral region 2, which extends in the radial direction from the outer peripheral edge of the contact lens 10 to the edge of the optical region 1, and appears as a crescent (part) in the front-to-back direction. In more detail, the tear fluid passage 31 has opposite side walls 31c and 31d in the circumferential direction of the contact lens 10 (or in the direction of the back surface or the front surface), the distance between the side wall 31c and the side wall 31d gradually decreases towards the radial inner side (the center side of the contact lens 10), and the side wall 31c extends in a curved manner, while the side wall 31d extends in a curved manner with a smaller curvature than the side wall 31c, the concave-convex directions formed by the two curved side walls are the same (that is, they curve in the same direction, rather than curve towards each other or curve away from each other), so that the tear fluid passage 31 appears as a (part of) crescent.
[0109] In addition, in the present embodiment, the side wall 31c with a large curvature is located in the Figure 9 clockwise direction of the side wall 31d in the Figure 9 counterclockwise direction, so as to facilitate the rotation of the contact lens 10 in the clockwise direction. That is, by forming the structure in which the side wall 31c and the side wall 31d curve with different curvatures, the rotation direction of the contact lens 10 can be set.
[0110] As an example Figure 9 The tear channel 31 can be an open channel (composed of the above-mentioned long groove) or a closed channel.
[0111] For example, in the case of an open channel, it can be said that the two ends of the tear channel 31 have openings (i.e., an opening on the radially inner side and an opening on the radially outer side), and the tear channel 31 extends in a curved manner so that the two openings are in different positions in the circumferential direction (viewed from the midpoint).
[0112] In addition, as mentioned above, the distance between sidewalls 31c and 31d gradually decreases radially inward (towards the center of the contact lens 10). As another implementation of this structure, the tear channel can also have one or two sidewalls extending in a straight line, the direction of which can be exactly the same as the radial direction or can be inclined relative to the radial direction.
[0113] Figure 11 This is a schematic diagram of the structure of a contact mirror according to one embodiment of the present invention; Figure 12 This is a schematic diagram of the structure of a contact mirror according to one embodiment of the present invention; Figure 13 This is a schematic diagram of the structure of a contact mirror according to one embodiment of the present invention; Figure 14 This is a schematic diagram of the structure of a contact mirror according to one embodiment of the present invention.
[0114] These implementation methods and Figure 9 The difference in the illustrated implementation is that, in Figure 10 In the middle, there is only one tear duct 31, while Figure 11 There are 2 tear ducts 31 in the middle. Figure 12 There are 3 tear ducts 31 in the middle. Figure 13 There are 4 tear ducts 31 in the middle. Figure 14 There are 6 tear channels 31, which are evenly distributed in the circumferential direction (equally spaced). As another embodiment, they may be unevenly distributed.
[0115] Figure 15 This is a schematic diagram of the structure of a contact mirror according to one embodiment of the present invention.
[0116] This implementation method and Figure 9 The difference in the illustrated embodiments lies in the different curvature of the tear channel. Specifically, the contact lens 10 has a tear channel 32, in which the curvature of the clockwise side wall of the circumferentially opposite side wall is greater than that of the counterclockwise side wall, thus allowing the contact lens 10 to rotate counterclockwise.
[0117] Figure 16is a structure diagram of a contact lens according to an embodiment of the present application. Figure 17 is Figure 16 is a diagram illustrating the shape of the passage in
[0118] The embodiment of the present application differs from the embodiment shown in Figure 9 in that the shape of the tear fluid passage is different: in Figure 9 the tear fluid passage is crescent-shaped, whereas in the embodiment of the present application, the tear fluid passage is V-shaped.
[0119] Specifically, as shown in Figure 16 , 17 , the contact lens 10 has a tear fluid passage 35 in the peripheral zone 2, which extends from the radially outer side to the radially inner side, turns back and extends again to the radially outer side, thereby forming a V shape. In this way, the contact lens 10 can also be caused to rotate under the action of fluid mechanics by causing the tear fluid to flow into the tear fluid passage 35.
[0120] In addition, in the embodiment of the present application, the tear fluid passage 35 extends from the outer peripheral edge of the contact lens 10 to the outer peripheral edge of the optical zone 1 or to the inner peripheral edge of the peripheral zone 2, at the boundary between the optical zone 1 and the peripheral zone 2, thereby forming a passage as long as possible to reliably cause the contact lens 10 to rotate.
[0121] In addition, in the embodiment of the present application, as clearly shown in Figure 17 , the tear fluid passage 35 has two end portions at different circumferential positions at the outer peripheral edge of the contact lens 10, is open at least at the two end portions, and the cross-sectional area or the cross-sectional width of the tear fluid passage 35 gradually decreases from one end portion to the other end portion, thereby being able to enhance the force acting on the contact lens 10 and reliably cause the contact lens 10 to rotate.
[0122] In addition, in the embodiment of the present application, the tear fluid passage 35 gradually decreases from the end portion on the counterclockwise side to the end portion on the clockwise side, so that the contact lens is easily caused to rotate in the clockwise direction, that is, the portion with a large cross-sectional area or cross-sectional width is on the counterclockwise side, and the portion with a small cross-sectional area or cross-sectional width is on the clockwise side, so that the contact lens is easily caused to rotate in the clockwise direction. In this way, the direction of rotation of the contact lens 10 can be set.
[0123] Figure 18 is a structure diagram of a contact lens according to an embodiment of the present application. Figure 19 is a structure diagram of a contact lens according to an embodiment of the present application. Figure 20 is a structure diagram of a contact lens according to an embodiment of the present application. Figure 21 is a structure diagram of a contact lens according to an embodiment of the present application.
[0124] These embodiments differ fromFigure 16 The difference between the embodiment shown in Figure 16 is that there is only one tear fluid passage, while the difference between the embodiment shown in Figure 18 is that there are two tear fluid passages 35, the difference between the embodiment shown in Figure 19 is that there are three tear fluid passages 35, the difference between the embodiment shown in Figure 20 is that there are four tear fluid passages 35, and the difference between the embodiment shown in Figure 21 is that there are six tear fluid passages 35, which are evenly distributed in the circumferential direction. As other embodiments, they can also be unevenly distributed.
[0125] In the present embodiment, the tear fluid passage 35 is extended in a V shape, that is, it is extended linearly first, and then it is extended linearly after being bent at an acute angle. However, the present application is not limited thereto, and it can also be extended in a C shape, that is, it is extended in a curve first, and then it is extended in a curve after being bent at a smooth curve, or it can be extended in a U shape, that is, it is extended linearly first, and then it is extended linearly after being bent at a smooth curve.
[0126] In addition, as described above, the structure of the present embodiment can be combined with the above embodiments, for example, a closed passage can be used, or an open passage can be used, which will not be described one by one here.
[0127] Figure 22 is a structural diagram of a contact lens according to an embodiment of the present application.
[0128] The difference between the present embodiment and the embodiment shown in Figure 16 is that the change direction of the cross-sectional area or the cross-sectional width of the passage is different. Specifically, as shown in Figure 22 , the contact lens 10 has a tear fluid passage 36, which has two end portions located at the outer peripheral edge portion of the contact lens 10, and the cross-sectional area or the cross-sectional width of the tear fluid passage 36 gradually decreases from the end portion on the clockwise side to the end portion on the counterclockwise side, so that the contact 10 can be easily rotated in the counterclockwise direction.
[0129] Figure 23a - Figure 23d is a diagram illustrating several cross-sectional examples of the passage according to the embodiment of the present application. As shown in Figure 23a , the tear fluid passage can be a square cross-section (an example of a polygonal cross-section); as shown in Figure 23b , the tear fluid passage can be a triangular cross-section; as shown in Figure 23c , the tear fluid passage can be a circular cross-section; and as shown in Figure 23d , the tear fluid passage can be a pentagonal cross-section.
[0130] Figure 24 is a diagram illustrating the shape of the passage according to an embodiment of the present application. Figure 24 is Figure 9 , Figure 10A variant of Figure 9 , Figure 10 , the cross-sectional area or the cross-sectional width of the passage continuously changes, while in Figure 24 , the cross-sectional area or the cross-sectional width changes in stages, presenting a ladder shape with stepped end faces.
[0131] Figure 25 is a sectional view of the passage shape according to an embodiment of the present application. Figure 25 is a variant of Figure 16 , Figure 17 , the main difference being that in Figure 16 , Figure 17 , the cross-sectional area or the cross-sectional width of the passage continuously changes, while in Figure 25 , the cross-sectional area or the cross-sectional width changes in stages, presenting a ladder shape with stepped end faces.
[0132] Figure 26 is a sectional view of the passage shape according to an embodiment of the present application. Figure 27 is a sectional view of the passage shape according to an embodiment of the present application. In Figure 26 , the cross-sectional area and the cross-sectional width continuously change, while in Figure 27 , the cross-sectional area and the cross-sectional width change in stages, presenting a ladder shape with a transition slope.
[0133] The present application can be applied to various contact lenses, and is not limited to contact lenses and orthokeratology lenses. For example, the contact lens can be a scleral contact lens or a corneal contact lens, and the corneal contact lens can be a soft corneal contact lens, a rigid corneal contact lens, or a hybrid corneal contact lens, wherein the rigid corneal contact lens includes a rigid non-gas permeable corneal contact lens, a rigid gas permeable corneal contact lens, or an orthokeratology lens.
[0134] According to the above description, the following embodiments can be obtained.
[0135] Embodiment 1
[0136] As shown in Figure 1 , Figure 2 , a daily-wear contact lens has an optical zone with a diameter of 7.0 mm, and different meridional directions of the optical zone have different optical designs. The peripheral zone outside the optical zone has an open tear channel, i.e., the channel is connected to the outside below (on the back surface side), similar to a groove.
[0137] Embodiment 2
[0138] As shown in Figure 3 , Figure 4As shown, a daytime contact lens has an optical zone diameter of 9.0 mm, with different optical designs along different meridians. Outside the optical zone is the peripheral zone, which has a closed tear channel; that is, the area below the channel (on the posterior surface) is not connected to the outside, resembling a conduit. The channel extends to the lens edge, where it opens to allow tear flow.
[0139] Example 3
[0140] like Figure 5 , Figure 6 As shown, an orthokeratology lens has different optical designs along different meridian directions in the base curve region. The positioning curve region has an open tear channel, meaning that the lower part of the channel is connected to the outside, similar to a groove.
[0141] Example 4
[0142] like Figure 7 , Figure 8 As shown, an orthokeratology lens features different optical designs along different meridians in the base curve region. The positioning curve region has a closed tear channel, meaning the lower part of the channel is not connected to the outside, resembling a tube. The two ends of the channel extend to the reversal curve region and the lateral curve region, respectively, to allow tear flow.
[0143] Example 5
[0144] like Figure 16 As shown, the tear channel is V-shaped, and the cross-sectional area of the channel varies, with one end having a larger area and the other end having a smaller area. Furthermore, the end with the larger area is on the counterclockwise side of the end with the smaller area, allowing the lens to rotate slowly clockwise after being fitted.
[0145] Example 6
[0146] like Figure 22 As shown, the tear channel is V-shaped, and the cross-sectional area of the channel varies, with one end having a larger area and the other end having a smaller area. Furthermore, the end with the larger area is on the clockwise side of the end with the smaller area, allowing the lens to rotate slowly counterclockwise after being fitted with the lens.
[0147] Example 7
[0148] like Figure 9 As shown, the tear channel is crescent-shaped, and the cross-sectional area of the channel varies, with one end having a larger area and the other end having a smaller area. Furthermore, the end with the larger area is to the left of the end with the smaller area (counterclockwise side), allowing the lens to rotate slowly clockwise after being fitted.
[0149] Example 8
[0150] like Figure 15As shown, the tear fluid channel is crescent-shaped, the cross-sectional area of the channel is variable, the area at one end is larger, the area at one end is smaller, and the area at one end is larger on the right side (clockwise side) of the area at one end, and the lens can be slowly rotated clockwise after wearing the lens.
[0151] Example 9
[0152] As shown, the tear fluid channel is V-shaped, a total of 2 / 3 / 4 / 6 channels, and the channels are uniformly arranged in the circumferential direction. Figure 18 - Figure 21
[0153] Example 10
[0154] As shown, the tear fluid channel is crescent-shaped, a total of 2 / 3 / 4 / 6 channels, and the channels are uniformly arranged in the circumferential direction. Figure 11 - Figure 14
[0155] Example 11
[0156] As shown, the tear fluid channel is V-shaped, and the cross-sectional width is uniformly variable. Figure 16
[0157] Example 12
[0158] As shown, the tear fluid channel is V-shaped, and the cross-sectional width is phase mutation. The number and degree of mutation can be arbitrarily set, and by setting the number and degree, the tear fluid flow rate can be controlled, and then the rotation force can be controlled. Figure 25
[0159] Example 13
[0160] As shown, the tear fluid channel is crescent-shaped, and the cross-sectional width is uniformly variable. Figure 10
[0161] Example 14
[0162] As shown, the tear fluid channel is crescent-shaped, and the cross-sectional width is phase mutation. The number and degree of mutation can be arbitrarily set, and by setting the number and degree, the tear fluid flow rate can be controlled, and then the rotation force can be controlled. Figure 24
[0163] Example 15
[0164] As shown, the cross-sectional shape can be circular, elliptical, semicircular, semi-elliptical, triangular, polygonal, etc. Figure 23a - Figure 23d
[0165] Example 26
[0166] As shown is a channel perspective view, the cross-sectional shape is square, and the cross-sectional area is uniformly variable. Figure 26
[0167] Example 27
[0168] As Figure 27 shown is a channel perspective view, the cross-sectional shape is square, and the cross-sectional area is stepwise changed. The number and degree of change can be arbitrarily set, and by setting the number and degree, the tear flow rate can be controlled, and in turn the rotation force can be controlled.
[0169] By using the above embodiments, the following technical effects can be achieved: the power is derived from the natural tear flow of the human eye, the lens can be rotated at any time, and it can be suitable for daily wear and night wear; the tear force is more gentle than the eyelid force, the rotation of the lens is more stable and slow, and the safety of wearing is improved; there is no effect on the surface shape of the lens, and there is no foreign body sensation stimulation to the eyelid, and the comfort of wearing is better.
[0170] Note that the above are only the preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the technical concept of the present application, and all belong to the protection scope of the present 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, Further comprising a tear fluid channel extending along the posterior surface or the anterior surface in a radial direction of the contact lens.
2. The contact lens of claim 1, wherein, The cross-sectional area or the cross-sectional width of the tear fluid channel decreases from the first end side to the second end side.
3. The contact lens of claim 1, wherein, The first end of the tear fluid channel is open at an outer peripheral edge portion of the contact lens.
4. The contact lens of claim 3, wherein, The first end of the tear fluid channel is open on an end surface of the outer peripheral edge portion of the contact lens, or is open on a posterior surface of the outer peripheral edge portion of the contact lens.
5. The contact lens of claim 3, wherein, The second end of the tear fluid channel is open at a position radially inward of the first end of the contact lens.
6. The contact lens of claim 1, wherein, Comprising an optical zone and a peripheral zone located peripherally of the optical zone, the tear fluid channel is provided in the peripheral zone.
7. The contact lens of claim 1, wherein, The first end and the second end of the tear fluid channel are located differently in a circumferential direction of the contact lens.
8. The contact lens of claim 1, wherein, The tear fluid channel extends from a radially outer side to a radially inner side of the contact lens and then turns back.
9. The contact lens of claim 8, wherein, The tear fluid channel turns back in a V-shape, a C-shape, or a U-shape.
10. The contact lens of claim 8, wherein, The first end and the second end of the tear fluid channel are open at an outer peripheral edge portion of the contact lens.
11. The contact lens of claim 1, wherein, The tear fluid channel has first and second side walls opposite in a circumferential direction along the posterior surface or the anterior surface, and a distance between the first and second side walls increases toward a radially outer side.
12. The contact lens of claim 11, wherein, The first side wall extends curvedly, and the second side wall extends with a smaller degree of curvature than the first side wall, and the concave-convex directions formed by the curved extensions of the first and second side walls are the same.
13. The contact lens of any one of claims 1-12, wherein, The tear fluid channel has a plurality of channels, and the plurality of tear fluid channels are arranged in a circumferential direction of the contact lens.
14. The contact lens of any one of claims 1-12, wherein, A part or all of the tear fluid channel is constituted by a long groove open on a posterior surface of the contact lens.
15. The contact lens of any one of claims 1-12, wherein, A part or all of the tear fluid channel is constituted by a closed channel closed on an anterior surface and a posterior surface of the contact lens.
16. The contact lens of any one of claims 1-12, wherein, The optical zone has different optical properties in different radial directions.
17. The contact lens of claim 16, wherein, The optical properties include a defocus amount, a radius of curvature, or an imaging disturbance property.
18. The contact lens of any one of claims 1-12, wherein, The cross-sectional area and / or the cross-sectional width of the tear fluid channel continuously or stepwise changes.
19. The contact lens of any one of claims 1-12, wherein, The cross section of the tear fluid channel is circular or polygonal.
20. The contact lens of any one of claims 1-12, wherein, The contact lens is a corneal molding lens comprising a base curve zone as an optical zone and a peripheral zone located peripherally of the base curve zone.
21. The contact lens of claim 20, wherein, The peripheral zone comprises, in order toward a radially outer side, a reverse curve zone and a positioning curve zone, and the tear fluid channel is provided at least in the positioning curve zone.
22. The contact lens of claim 21, wherein, The tear fluid channel is open in the reverse curve zone.
23. The contact lens of claim 21, wherein, Further comprising a rim curve zone located peripherally of the positioning curve zone, and the tear fluid channel is open in the rim curve zone.
24. The contact lens of any one of claims 1-12, wherein, The contact lens is a contact lens.
25. The contact lens of any one of claims 1-12, wherein, The diameter of the optical zone of the contact lens is 6-10 mm.
26. The contact lens of any one of claims 1-12, wherein, A part or all of the tear fluid channel extends obliquely with respect to a radial direction of the contact lens.
27. The contact lens of any one of claims 1-12, wherein, A part or all of the tear fluid channel has a cross-sectional area or a cross-sectional width that decreases from a radially outer side to a radially inner side of the contact lens.