CN213634027U - Orthokeratology lens for correcting myopia of teenagers - Google Patents

Abstract

The application discloses moulding mirror of cornea for correcting teenagers' myopia includes: a lens body, the lens body comprising: a central correction unit for correcting a central portion of an eyeball; a peripheral extension for covering a peripheral portion of the eyeball; an edge contact portion for contacting a peripheral portion of an eyeball; wherein the peripheral extension is disposed between the central correction and the edge contact; the central correction part is constructed in a symmetrical structure relative to the central axis and is provided with a plurality of central area through holes penetrating through the inner side and the outer side of the central correction part, the central area through holes are dislocation holes, and the extending direction of each section of dislocation hole is obliquely intersected with the central axis. The utility model has the advantages of providing a cornea shaping mirror for correcting teenager myopia which has reasonable and reliable structure and can improve oxygen permeability.

Description

Orthokeratology lens for correcting myopia of teenagers

Technical Field

The application relates to a corneal shaping mirror, in particular to a corneal shaping mirror for correcting juvenile myopia.

Background

The cornea shaping lens is a cornea contact lens similar to a contact lens, and mainly achieves the purposes of correcting myopia and helping myopia patients improve eyesight by wearing the cornea at night to gradually change the curvature of the cornea. The process of correcting myopia by wearing the orthokeratology mirror is safe, reliable and remarkable in effect, so that the orthokeratology mirror is popular with doctors and patients, substances such as grease, protein and corneal epithelial metabolic cells are easily adhered in the reversal arc of the mirror when the orthokeratology mirror is worn, and the orthokeratology mirror needs to be cleaned and nursed before and after the orthokeratology mirror is worn.

The existing orthokeratology lens has the problem that the high oxygen permeability is contradictory to the lens strength, in order to obtain higher oxygen permeability, the existing orthokeratology lens adopts a lens material with high oxygen permeability such as fluorine-silicon acrylate, although the oxygen permeability of the material can be improved by adding fluorine, the mechanical strength of the material can be reduced, so that the lens is easy to damage and fall off easily.

Disclosure of Invention

A orthokeratology lens for correcting juvenile myopia, comprising: a lens body, the lens body comprising: a central correction unit for correcting a central portion of an eyeball; a peripheral extension for covering a peripheral portion of the eyeball; an edge contact portion for contacting a peripheral portion of an eyeball; wherein the peripheral extension is disposed between the central correction and the edge contact; the central correction part is constructed in a symmetrical structure relative to the central axis and is provided with a plurality of central area through holes penetrating through the inner side and the outer side of the central correction part, the central area through holes are dislocation holes, and the extending direction of each section of dislocation hole is obliquely intersected with the central axis.

Furthermore, the central area through hole comprises two sections which are arranged in parallel.

Further, the staggered direction of the two staggered parts of the through hole in the central area is perpendicular to the central axis.

Further, the two staggered sections of the through hole in the central area are in the same shape.

Furthermore, the diameters of the staggered two sections of the through hole in the central area are the same.

Further, the central zone through holes are uniformly arranged in the central correction portion.

Further, the central area through holes are symmetrically arranged relative to the central axis.

Furthermore, two sections of the through holes in the central area are circular holes.

Furthermore, the two sections of the through hole in the central area are hexagonal holes.

Further, an interface between two sections of the central region through hole is perpendicular to the central axis.

The application has the advantages that: provides a cornea shaping mirror for correcting the myopia of teenagers, which has reasonable and reliable structure and can improve the oxygen permeation rate.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:

FIG. 1 is a schematic view of a orthokeratology lens fitted to an eye according to a first embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of the orthokeratology mirror of FIG. 1;

FIG. 3 is a first enlarged partial view of the orthokeratology mirror of FIG. 1;

FIG. 4 is a second enlarged partial view of the orthokeratology lens of FIG. 1;

FIG. 5 is an exploded view of the orthokeratology mirror of FIG. 1;

FIG. 6 is a schematic view of a keratoplasty mirror according to a second embodiment of the present application fitted to an eye;

FIG. 7 is a schematic cross-sectional view of the orthokeratology mirror of FIG. 6;

FIG. 8 is a first enlarged partial view of the orthokeratology mirror of FIG. 6;

FIG. 9 is a second enlarged partial view of the orthokeratology mirror of FIG. 6;

FIG. 10 is a schematic view of a keratoplasty mirror according to a third embodiment of the present application fitted to an eye;

FIG. 11 is a schematic cross-sectional view of the orthokeratology mirror of FIG. 10;

figure 12 is a first partially enlarged view of the orthokeratology mirror shown in figure 10;

figure 13 is a second enlarged partial view of the orthokeratology mirror shown in figure 10;

FIG. 14 is a schematic view of the orthokeratology mirror of FIG. 10 viewed from the lateral side;

FIG. 15 is a schematic view of the orthokeratology lens of FIG. 10 viewed from the medial side;

FIG. 16 is a schematic view of a modified version of the orthokeratology mirror of FIG. 10 viewed from the outside;

FIG. 17 is a schematic structural view of a lens body according to a fourth embodiment of the present application;

FIG. 18 is a schematic structural view of a lens body according to a fifth embodiment of the present application;

FIG. 19 is a schematic structural view of a lens body according to a sixth embodiment of the present application;

FIG. 20 is a schematic structural view of a lens body according to a seventh embodiment of the present application;

FIG. 21 is a schematic structural view of a lens body according to an eighth embodiment of the present application;

fig. 22 is a schematic structural view of a lens body according to a ninth embodiment of the present application.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Example one

Referring to the first embodiment shown in fig. 1-5, a orthokeratology lens includes a lens body 100.

The lens body 100 may be made of a rigid RGP material or a combination of a rigid RGP material and a soft RGP material, and as an alternative, one of siloxane methacrylate, fluorosilicone acrylate, polymethyl methacrylate and their modifications, such as modified materials with silicon or/and fluorine added, may be selected.

Specifically, the lens body 100 includes: a central correction portion 101, a peripheral extension portion 102, an edge contact portion 103, and a connection structure portion 104.

Wherein the central correction unit 101 corrects the central part of the eyeball 200; the peripheral extension 102 is used to cover the peripheral portion of the eyeball 200; the edge contact part 103 is used to contact the peripheral portion of the eyeball 200.

Specifically, the central correction unit 101 physically presses the central portion of the eyeball 200 (one layer of tear layer still exists between the eyeball 200 and the central correction unit 101), and the central correction unit 101 forms a space for storing tear liquid around the central portion of the eyeball 200, and corrects the shape of the eyeball 200 by pulling the eyeball 200 at this place by the hydrodynamic properties of the tear liquid.

The term "forward arc" in this embodiment means that the arc is convex to the outside of the eyeball 200, in other words, the centers of curvature of all the curvature circles of all the curves of the arc are located on the inside of the arc, i.e. the side close to the eyeball 200. In contrast, the term "reverse arc surface" in this embodiment means that the arc surface is convex toward the inner side of the eyeball 200, in other words, the centers of curvature of all the curvature circles of all the curved surfaces of the arc surface are located on the outer side of the arc surface, i.e., the side away from the eyeball 200.

As a specific scheme, the central extrados surface 101a is a forward cambered surface; the central intrados 101b is a reverse camber; the maximum radius of curvature of the central intrados surface 101b is equal to or greater than the maximum radius of curvature of the central extrados surface 101 a.

In the related art, both the medial surface and the lateral surface of the conventional central correction device 101 are forward curved surfaces. Although the inner side surface and the outer side surface are designed in the same direction, which is convenient for processing and is suitable for the radian of the eyeball 200, after experiments and researches, in order to form a space for accommodating tears on the periphery, the inner side surface of the traditional forward cambered surface cannot change the shape of the central part of the eyeball 200 in a more efficient manner due to the bending direction, and after the shape of the eyeball 200 is changed to a certain extent, the periphery accommodating tears is gradually compressed, so that the function of correcting the eyeball 200 by tear tension is reduced. For the above reasons, when the user wears the shaping mirror, the correction deformation of the eyeball 200 is slow at the beginning, and after the correction deformation of the eyeball 200 reaches a certain degree, the correction deformation of the eyeball 200 is basically stopped due to the reduction of the space for storing the tear fluid and the reduction of the direct pressing effect of the central correction portion 101. Thus, the time for the shaping mirror to actually generate a significant effect only accounts for a part of the actual wearing time, and since the shaping mirror is only worn at night, if the shaping efficiency cannot be improved, after the shaping mirror is removed in the daytime, the eyeball 200 can be quickly restored to the shaping state due to the short effective shaping time, thereby reducing the shaping effect.

The technical solution of this embodiment is that, by adopting an unconventional design, the central intrados 101b is set to be a reverse arc, and by adopting such a scheme, the central intrados 101b can compress the central part of the eyeball 200 more directly, and the arc shape and size of the central extrados 101a are properly set, so that the central part of the eyeball 200 can still be compressed with a more suitable interface, unlike the general knowledge of a shaping mirror, the reverse arc does not cause a larger difference feeling of the eye when compared with the forward arc used in the prior art, because a certain thickness of tear layer is still present between the lens body and the eyeball 200, and after the central intrados 101b adopts a reverse arc, the tear layer is always kept between the central extrados 101a and the eyeball 200 due to the action of liquid tension; meanwhile, due to the design of the reverse cambered surface, the space for storing the tear liquid at the periphery is enlarged, so that enough space is always kept for containing the tear liquid, and enough tear liquid isolation is always kept between the central inward cambered surface 101b and the eyeball 200, so that the oxygen permeation condition of the eyeball 200 is improved (because the tear liquid is flowing), and the tear liquid pulling effect is enhanced.

And the maximum radius of curvature of the central intrados 101b in this embodiment is greater than or equal to the maximum radius of curvature of the central extrados 101a, which ensures that the central intrados 101b does not press the eyeball 200 excessively when the eyelid touches the central extrados 101 a.

As a more specific preferable mode, the central correction portion 101 is constructed in a symmetrical structure with respect to the central axis C1, and the central correction portion 101 is provided with a plurality of central zone through holes 101C penetrating through the inner and outer sides thereof. These central area through holes 101C are arranged obliquely with respect to the central axis C1.

The aperture size of the central area through hole 101c ranges from 0.15mm to 0.27mm, and as a preferable scheme, the aperture size of the central area through hole 101c is 0.20 mm.

The inclined central zone through holes 101c are used to communicate the inner and outer sides of the central correction unit 101, so that the oxygen permeability of the central correction unit 101 can be improved.

In the conventional technical idea, the central correction unit 101 is considered to be incapable of opening a through hole to achieve the correction effect of the compression, so that the compression correction cannot be achieved, but the completely closed central correction unit 101 cannot perform efficient oxygen exchange at the position, so that the oxygen permeability can be improved only by increasing the content of fluorine in the material, but the addition of fluorine easily causes the reduction of the strength of the lens body, thereby bringing a new technical problem.

In the present embodiment, as described in the foregoing, due to the special design of the central intrados 101b of the central correction portion 101, the direct compression of the central correction portion 101 is indirectly realized by the lacrimal fluid layer, and the eyeball 200 is shaped by the pulling action of the lacrimal fluid, so that the opening of the central correction portion 101 does not affect the compression of the central correction portion 101, and due to the capillary principle and the existence of liquid surface tension, the lacrimal fluid does not flow through the central area through hole 101c, but only permeates into the central area through hole 101c due to capillary action, which also helps the pulling action of the lacrimal fluid layer, and the permeation rate of the lacrimal fluid into the central area through hole 101c is greatly increased, and the eyeball 200 is shaped by the lacrimal fluid layer pulling action.

In addition, the inclined central zone through hole 101c extends the length of the central zone through hole 101c while reducing the effect of the hole on the strength of the central correction portion 101. And the inclined through holes increase the contact area of air and tears, and improve the oxygen permeability.

Alternatively, the central-area through hole 101c is a hole extending along an axis and symmetrically disposed with respect to the axis, such as a circular hole, a hexagonal hole; other irregular holes, such as elliptical holes, are also possible.

As a further preferable mode, the angle formed by the central zone through hole 101C and the central axis C1 is defined as a central inclination angle, and the value of the central inclination angle of the central zone through hole increases as it is farther from the central axis C1.

I.e., the further outward from the center axis C1, the greater the angle of inclination of the central area through hole 101C. It is to be noted that the center-area through hole 101C is not provided at the center axis C1 in parallel therewith.

In addition, the degree a of the inclination angle of the central area through hole 101C with the central axis C1 can be confirmed by the following formula, i.e., 30+ 0.5R; where R is the distance from the inner side (eyeball side) of the central through hole 101C to the central axis C1, which is calculated in mm, for example, the distance from the inner side of the central through hole 101C to the central axis C1 is 5mm, and the degree a of the inclination angle formed by the central through hole 101C and the central axis C1 is 30+0.5 × 5 to 32.5.

It should be noted that the distance from the central axis C1 to the orifice is the distance from the hole axis at the orifice to the central axis C1, and the hole axis refers to the central region through hole 101C formed substantially with the hole axis as the center of symmetry, such as a through hole with a cross section (perpendicular to the hole axis) of a circular, hexagonal, or other centrosymmetric shape. The above is one way of calculating the orifice to center axis C1.

Alternatively, the distance from the orifice to the central axis C1 is the distance from the edge closest to the central axis C1 at the orifice to the central axis C1; with such a design, the center tilt angle design of the center area through hole 101c of various shapes can be applied.

The gradual central through hole 101c also conforms to the design of the inner space of the lens body in the technical solution of the present embodiment.

Preferably, the peripheral extension 102 comprises: a peripheral extrados surface 102a and a peripheral intrados surface 102b, the peripheral intrados surface 102b being a forward arc surface; the peripheral extrados surface 102a is a forward arc surface. The peripheral extension 102 is mainly used to effectively wear the lens body to the eyeball 200.

The edge contact portion 103 includes: an edge intrados surface 103b, an edge extrados surface 103a and a rounded edge 103c, the edge intrados surface 103b being a reverse arc surface. The edge extrados surface 103a is a forward arc surface; the rounded edge 103c connects between the edge intrados 103b and the edge extrados 103 a. As a further preferred option, the peripheral extension part 102 is provided with a plurality of peripheral through holes 102c penetrating through the inner side and the outer side thereof.

In the prior art, the inner and outer sides of the peripheral extension part 102 are reverse arc surfaces, so that the eyeball 200 is clamped by the elasticity of the lens; and the edge contact portion 103 adopts a reverse arc surface for tear discharge.

In the present embodiment, the forward arc surface is adopted, the peripheral inner arc surface 102b is the forward arc surface to increase the tear storage space, and a certain suction force is generated between the peripheral extension portion 102 and the eyeball 200 due to the peripheral region through hole 102c, and meanwhile, due to the shape of the peripheral extension portion 102, the peripheral extension portion 102 can position the whole lens.

The angles of the peripheral region through holes 102c may adopt the same inclination angle, that is, the peripheral region through holes 102c may be arranged in parallel. The rim contact part 103 can better discharge tears and make a flexible contact with the eyeball 200 to avoid damage.

As a unique design of the present embodiment, the connecting structure portion 104 of the present embodiment is used to connect the central correction portion 101 and the peripheral extension portion 102; further, specifically, the connection structure portion 104 includes: a first connecting intrados surface 104a, a second connecting intrados surface 104b, and a third connecting intrados surface 104 c; wherein the second connecting intrados 104b is disposed between the first connecting intrados 104a and the third connecting intrados 104 c; the first connection intrados 104a and the third connection intrados 104c are forward-arc surfaces; the second connecting intrados surface 104b is a reverse arc surface.

The first connecting intrados 104a, the second connecting intrados 104b and the third connecting intrados 104c are designed to enhance the connecting strength between the central correction portion 101 and the peripheral extension 102, and the second connecting intrados 104b is designed to enhance the pulling action of tear on the eyeball 200 under the influence of fluid mechanics when the tear flows from the central correction portion 101 to the peripheral extension 102.

As a further preferable mode, as shown in fig. 5, the central correction portion 101 and the connection structure portion 104 may be made of hard materials so as to achieve correction of the eyeball 200, while the peripheral extension portion 102 and the edge contact portion 103 may be made of relatively soft materials so as to obtain comfortable wearing feeling. Therefore, the processing can be respectively processed and then combined, or the processing can be carried out in a unified way after the whole blank is formed.

The inclined through hole design can improve the oxygen permeability, and the inclined extension design buffers tear pressure and improves structural strength. The orthokeratology mirror of the first embodiment is very suitable for rapidly correcting the shape of an eyeball by combining the design of the body shape, namely the orthokeratology mirror of the first embodiment is an orthokeratology mirror.

Example two

Referring to the second embodiment shown in fig. 6-9, a orthokeratology lens includes a lens body 300.

The lens body 300 may be made of a rigid RGP material or a combination of a rigid RGP material and a soft RGP material, and as an alternative, one of siloxane methacrylate, fluorosilicone acrylate, polymethyl methacrylate, and a modified material thereof, such as a modified material with silicon or/and fluorine added, may be selected.

Specifically, the lens body 300 includes: a central correction portion 301, a peripheral extension portion 302, an edge contact portion 303.

Wherein the central correction unit 301 corrects the central part of the eyeball 200; peripheral extension 302 is used to cover the peripheral portion of eyeball 200; the edge contact part 303 is used to contact the peripheral portion of the eyeball 200.

Specifically, the central correction unit 301 physically presses the central portion of the eyeball 200 (although a tear layer still exists between the eyeball 200 and the central correction unit 301), and the central correction unit 301 forms a space for storing tear liquid around the central portion of the eyeball 200, and corrects the shape of the eyeball 200 by pulling the eyeball 200 at this place by the hydrodynamic properties of the tear liquid.

The term "forward arc" in this embodiment means that the arc is convex to the outside of the eyeball 200, in other words, the centers of curvature of all the curvature circles of all the curves of the arc are located on the inside of the arc, i.e. the side close to the eyeball 200.

As a specific scheme, the central extrados surface 301a is a forward cambered surface; the central inner arc surface 301b is also a forward arc surface; also, the maximum radius of curvature of the central intrados surface 301b is equal to or greater than the maximum radius of curvature of the central extrados surface 301 a. The central extrados 301a is a spherical arc, an ellipsoidal arc, a hyperbolic arc, or a combination thereof.

Moreover, the maximum radius of curvature of the central intrados 301b in this embodiment is greater than or equal to the maximum radius of curvature of the central extrados 301a, which ensures that the central intrados 301b does not press the eyeball 200 excessively when the eyelid touches the central extrados 301 a. Such a design is more suitable for a slightly myopic user, or a younger user, than the central intrados of the first embodiment.

Moreover, the central extrados surface 301a is designed to be closer to the original eyeball shape, so that the contact feeling of the central extrados surface to the eyelid is improved, and the comfort level is increased.

In order to secure the oxygen permeability, the central correction unit 301 is provided with a plurality of central zone through holes 301c, and the central zone through holes 301c penetrate the central correction unit 301. The central correction portion 301 is constructed in a symmetrical structure with respect to the central axis C1 and is provided with a plurality of central-zone through holes 301C penetrating through the inner and outer sides thereof, the central-zone through holes 301C extending in a direction parallel to the central axis C1.

Preferably, as shown in fig. 9, the central through hole 301c is a staggered hole, i.e. it comprises at least two staggered openings 301d, 301e, one opening 301d being in communication with the other opening 301e, but they are staggered by a certain distance so that the opening 301d is not completely aligned with the other opening 301 e. The offset corresponds to a translation by a distance in a direction perpendicular to the central axis C1.

With this arrangement, the tear does not easily pass through the central region through hole 301c, but is displaced in the two- stage openings 301d and 301e by the liquid level tension, so that the tear can contact with the outside oxygen, and the tear layer is held between the central correction portion 301 and the eyeball 200 by the liquid level tension, thereby effectively pressing the eyeball 200, and the tear drawing action in the central correction portion 301 is more effective by the capillary action of the tear in the central region through hole 301 c.

Alternatively, the two sections of openings 301d, 301e may have the same shape and diameter, but preferably, the two sections of through holes 301d, 301e have the same shape, such as a hexagon, but different holes (the maximum diameter, which is understood to be the diameter of the hexagon circumscribed circle in the case of a hexagon, and further preferably, the diameter of the section of opening 301d located on the outer side is smaller than that of the section of opening 301e located on the inner side.

The hexagonal shape is more beneficial to capillary action, but the hexagonal shape may bring weakening of structural strength, stress concentration easily exists at the corners, and as a further preference, a rounded corner design can be adopted at the corners. Of course, round holes may be used, but the round hole capillary effect is weaker than hexagonal.

As a specific preference, the opening 301e at the inner section is of hexagonal design, or at least of hexagonal design; the opening 301d at the outer section is a circular hole, which is designed to meet the design principle and structural strength requirements of the present embodiment.

Two segments of abutting apertures 301d, 301e, the aperture 301e in the inner segment being closer to the central axis C1 in a dimension perpendicular to the central axis C1 than the aperture 301d in the outer segment; and the length (the dimension in the direction of the central axis C1) of the opening 301e located at the inner side is smaller than the length of the opening 301d located at the outer side.

This has the advantage of further enhancing the capillary action, while the close proximity of the opening 301e to the central axis C1 improves the flexibility of the lens, making it easier to wear and conform to the shape of the eyeball 200.

Preferably, the intersection of the two sections 301d, 301e of all the central region through holes 301C is a straight line interface perpendicular to the central axis C1, and the straight line interfaces are aligned in the dimension of the central axis C1, which helps to form a uniform interface and is compatible with machining. Such a design is defined as a uniform interface design, which is one of the technical directions of the present embodiment, and the main concerns are the processing yield and the stability of the product, which are suitable for more universal products.

As an extension, the intersection of the two sections of openings 301d, 301e of all the central zone through holes 301c is in a shape close to the central extrados surface 301a or the central intrados surface 301b, i.e. a curved interface, and the distance between each of the curved interfaces and the corresponding position of the central intrados surface 301b (or the central extrados surface 301a) is constant, the distance being determined according to the shape of the eyeball 200, or the size of the intrados surface 301b designed for the shape of the eyeball 200.

Specifically, when the central intrados 301b is projected onto the central axis C1, the projection length thereof is defined as an intrados depth H, the projection of the central intrados 301b onto another projection line perpendicular to the central axis C1 is defined as an intrados span L, and the constant distance D from the central intrados 301b at each point of the curved interface is D, the constant distance D satisfies the following formula, D is H + L × N, where N ranges from 0.035 to 0.046. The formula is an empirical formula obtained from a large number of experiments, and in a certain sense, the influence of the sizes of the central intrados 301b in two directions on the shape is considered.

The design is beneficial in that the interfaces of the open holes 301d and 301e with two staggered ends are changed along with the central intrados 101b, so that the length of the open hole 301e positioned on the inner side section is ensured to be constant, a stable capillary effect is obtained, the pressure on the eyeball 200 is uniform, and the comfort is improved. Such a design is defined as a uniform pressure design, which is another technical direction of the present embodiment, and the main focus is on user personalization and comfort, although the processing is more complicated, such a product is more suitable for personalized customized products.

Preferably, the straight line interface can be arranged at different positions in the uniform interface design.

In the past, the central extrados 301a has been made to have a flat shape similar to the central intrados 301b for high oxygen permeability, thereby ensuring that the lens has a thinner thickness and thus maintains oxygen permeability. The present embodiment ensures oxygen permeability through the opening, and thus can break through the technical limitations of the prior art, and form the outer portion of the central correction unit 301 into a shape closer to the eyeball, and ventilate through the central zone through hole 301 c. Although the central correction unit 301 cannot be provided with a through hole in order to achieve the compressive correction effect in the conventional art, the compressive correction cannot be achieved, but the completely closed central correction unit 301 cannot perform efficient oxygen exchange at that position, and can improve the oxygen permeability only by increasing the fluorine content in the material, but the addition of fluorine easily causes a decrease in the strength of the lens body, which brings a new technical problem.

In the embodiment, the oxygen permeation and the rectification requirements are considered in a staggered hole opening mode, and meanwhile, the comfort level of a user is improved.

Preferably, peripheral extension 302 comprises: peripheral extrados face 302a and peripheral intrados face 302b, peripheral intrados face 302b being a forward face; peripheral extrados face 302a is a forward camber face. The peripheral extension 302 is mainly used to effectively wear the lens body to the eyeball 200.

The peripheral extension 302 is provided with a plurality of peripheral through holes 302C, the peripheral through holes 302C being parallel to the central axis C1. The peripheral via hole 302c may also be a staggered hole.

The edge contact portion 303 includes: edge intrados 303b, edge extrados 303a and rounded edge 303c, edge intrados 303b is the reverse arc. The edge extrados 303a is a forward camber; radiused edge 303c connects between edge intrados 303b and edge extrados 303 a. As a further preferred option, the peripheral extension 302 is provided with a plurality of peripheral through holes 302c penetrating through the inner and outer sides thereof.

In the previous design, the inner and outer sides of the peripheral extension 302 are reverse curved surfaces, so as to clamp the eyeball 200 by the elasticity of the lens; while the edge contact portion 303 adopts a reverse arc surface for tear discharge.

In the technical solution of this embodiment, the forward arc surfaces are adopted, the circumferential intrados 302b adopts the forward arc surface to increase the tear storage space, and a certain suction force (generated by tear tension) is generated between the circumferential extension portion 302 and the eyeball 300 due to the presence of the circumferential through hole 302c, and the circumferential extension portion 302 can position the entire lens due to the shape of the circumferential extension portion 302. Meanwhile, the fixation of the eyelid on the lens body 300 is increased due to the design of the edge contact part 303 and the shape and bionic design of the central extrados surface 301a of the central correction part 301.

Preferably, the size of the central area through hole 301c ranges from 0.15mm to 0.27mm, and preferably, the size of the central area through hole 301c is 0.20 mm. Similarly, the size of the peripheral through-hole 303c ranges from 0.15mm to 0.27 mm.

The present embodiment employs segmented central region through holes 301c, which effectively cushion tear fluid impingement and form corresponding interfaces to increase wicking action as compared to direct opening.

EXAMPLE III

Referring to the third embodiment shown in fig. 9-14, a orthokeratology lens includes a lens body 400.

The lens body 400 may be made of a rigid RGP material or a combination of a rigid RGP material and a soft RGP material, and as an alternative, one of siloxane methacrylate, fluorosilicone acrylate, polymethyl methacrylate, and a modification thereof, such as a modified material with silicon or/and fluorine added thereto, may be selected.

Specifically, the lens body 400 includes: a central correction portion 401, a peripheral extension portion 402, an edge contact portion 403.

The central correction unit 401 corrects the central portion of the eyeball 300; the peripheral extension 402 is used to cover the peripheral portion of the eyeball 300; the edge contact part 403 is used to contact the peripheral portion of the eyeball 200.

Specifically, the central correction unit 401 physically presses the central portion of the eyeball 300 (although a layer of tear layer still exists between the eyeball 200 and the central correction unit 401), and the central correction unit 401 forms a space for storing tear liquid around the central portion of the eyeball 200, and corrects the shape of the eyeball 200 by pulling the eyeball 200 at this space due to the hydrodynamic properties of the tear liquid.

The term "forward arc" in this embodiment means that the arc is convex to the outside of the eyeball 200, in other words, the centers of curvature of all the curvature circles of all the curves of the arc are located on the inside of the arc, i.e. the side close to the eyeball 200.

In contrast, the term "reverse arc surface" in this embodiment means that the arc surface is convex toward the inner side of the eyeball 200, in other words, the centers of curvature of all the curvature circles of all the curved surfaces of the arc surface are located on the outer side of the arc surface, i.e., the side away from the eyeball 200.

As a specific scheme, the central extrados 401a is a forward extrados; the central intrados 401b is a reverse camber; also, the maximum radius of curvature of the central intrados 401b is equal to or greater than the maximum radius of curvature of the central extrados 401 a. The central extrados 401a is a spherical arc, an ellipsoidal arc, a hyperbolic arc, or a combination thereof.

In the related art, both the medial side and the lateral side of the conventional central correction portion 401 are forward curved surfaces.

Although the inner side surface and the outer side surface are designed in the same direction, which is convenient for processing and is suitable for the radian of the eyeball 200, after experiments and researches, in order to form a space for accommodating tears on the periphery, the inner side surface of the traditional forward cambered surface cannot change the shape of the central part of the eyeball 200 in a more efficient manner due to the bending direction, and after the shape of the eyeball 200 is changed to a certain extent, the periphery accommodating tears is gradually compressed, so that the function of correcting the eyeball 200 by tear tension is reduced. For the above reasons, when the user wears the shaping mirror, the correction deformation of the eyeball 200 is slow at the beginning, and after the correction deformation of the eyeball 200 reaches a certain degree, the correction deformation of the eyeball 200 is basically stopped due to the reduction of the space for storing the tear fluid and the reduction of the direct pressing effect of the central correction portion 401.

Thus, the time for the shaping mirror to actually generate a significant effect only accounts for a part of the actual wearing time, and since the shaping mirror is only worn at night, if the shaping efficiency cannot be improved, after the shaping mirror is removed in the daytime, the eyeball 200 can be quickly restored to the shaping state due to the short effective shaping time, thereby reducing the shaping effect.

The technical solution of this embodiment is that, by adopting an unconventional design, the central inward arc surface 401b is set to be a reverse arc surface, and by adopting such a scheme, the central inward arc surface 401b can compress the central portion of the eyeball 200 more directly, and the arc surface shape and size of the central outward arc surface 401a are properly set, so that the central portion of the eyeball 200 can still have a more suitable interface to compress, unlike the general knowledge of a shaping mirror, the reverse arc surface does not cause a large difference feeling of the eye when compared with the forward arc surface adopted by the part in the prior art, because a tear liquid layer with a certain thickness is still present between the lens body and the eyeball 200, and after the central inward arc surface 401b adopts the reverse arc surface, the tear liquid layer is always kept between the central outward arc surface 401a and the eyeball 200 due to the action of liquid tension; meanwhile, due to the design of the reverse cambered surface, the space for storing the tear liquid at the periphery is enlarged, so that enough space is always kept for containing the tear liquid, and enough tear liquid isolation is always kept between the central inward cambered surface 401b and the eyeball 200, so that the oxygen permeation condition of the eyeball 200 is improved (because the tear liquid is flowing), and the tear liquid pulling effect is enhanced.

Moreover, the central extrados 401a is designed to be closer to the original eyeball shape, so that the contact feeling of the central extrados to the eyelid is improved, and the comfort level is increased.

In order to secure the oxygen permeability, the central correction unit 401 is provided with a plurality of central through holes 401c, and the central through holes 401c penetrate the central correction unit 401. The central correction portion 401 is constructed in a symmetrical structure with respect to the central axis C3 and is provided with a plurality of central through holes 401C penetrating through the inner and outer sides thereof, and the central through holes 301C extend in a direction obliquely intersecting the central axis C3.

In addition, the degree a of the inclination angle of the central area through hole 401C with the central axis C3 can be confirmed by the following formula a ═ 30+ 0.5R; where R is the distance of the inner opening of the central through hole 401C from the central axis C3, which is calculated in millimeters, for example, 5mm from the central axis C3, the central through hole 401C has an inclination angle a of 30+0.5 × 5 to 32.5 with respect to the central axis C3. The distance of the orifice from the central axis C3 is defined as in the previous embodiment.

The progressive central area through hole 401c also conforms to the design of the present embodiment for the inner space of the lens body 400.

Preferably, as shown in FIG. 3, the central through hole 401c is a staggered hole, i.e., it includes at least two staggered openings 401d, 401e, one opening 401d being in communication with the other opening 401e, but they are staggered a distance such that the opening 401d is not completely aligned with the other opening 401 e.

With this arrangement, the tear does not easily pass through the central through hole 401c, but is displaced in the two openings 401d and 401e by the liquid level tension, so that the tear can contact with the outside oxygen, and the tear layer is held between the central correction portion 401 and the eyeball 200 by the liquid level tension, thereby effectively pressing the eyeball 200, and the tear is more effectively pulled by the capillary action in the central through hole 401 c.

Alternatively, the two sections of openings 401d, 401e may have the same shape and diameter, but preferably, the two sections of through holes 401d, 401e have the same shape, such as a hexagon, but different holes (the maximum diameter, which is understood to be the diameter of the hexagon circumscribed circle in the case of a hexagon, and further preferably, the diameter of the section of opening 401d located on the outer side is smaller than that of the section of opening 401e located on the inner side.

The size of the central area through hole 401c ranges from 0.15mm to 0.27mm, and as a preferable scheme, the size of the central area through hole 401c is 0.20 mm.

The hexagonal shape is more beneficial to capillary action, but the hexagonal shape may bring weakening of structural strength, stress concentration easily exists at the corners, and as a further preference, a rounded corner design can be adopted at the corners. Of course, round holes may be used, but the round hole capillary effect is weaker than hexagonal.

As a specific preference, the opening 401e in the inner section is of hexagonal design, or at least of hexagonal design; the section of the opening 401d located at the outer side is a circular hole, and the design is designed according to the design principle and the structural strength requirement of the embodiment.

Two sections of abutting apertures 401d, 401e, the aperture 401e in the inner section being closer to the central axis C3 in the dimension perpendicular to the central axis C3 than the aperture 401d in the outer section; and the length (dimension in the direction of the central axis C3) of the opening 401e located at the inner side is smaller than the length of the opening 401d located at the outer side.

This has the advantage of further enhancing capillary action, while the proximity of opening 401e to central axis C3 provides improved lens flexibility for ease of wearing and conformity to the shape of eyeball 200.

Preferably, the intersection of the two openings 401d, 401e of all the central through holes 401C is a straight line interface perpendicular to the central axis C3, and the straight line interfaces are aligned in the dimension of the central axis C3, which helps to form a uniform interface and is compatible with machining. Such a design is defined as a uniform interface design, which is one of the technical directions of the present embodiment, and the main concerns are the processing yield and the stability of the product, which are suitable for more universal products.

As an extension, the intersection of the two sections of the openings 401d, 401e of all the central through holes 401c is in a shape close to the central extrados 401a or the central intrados 401b, i.e. a curved interface, and the distance at each of the curved interfaces relative to the corresponding position of the central intrados 401b (or the central extrados 401a) is constant, the distance being determined according to the shape of the eyeball 200, or according to the size of the intrados 401b designed for the shape of the eyeball 200.

Specifically, when the central intrados 401b is projected onto the central axis C3, the projection length thereof is defined as an intrados depth H, the projection of the central intrados 401b onto another projection line perpendicular to the central axis C3 is defined as an intrados span L, and the constant distance D from the central intrados 401b at each point of the curved interface is D, the constant distance D satisfies the following formula, D is H + L × N, where N ranges from 0.035 to 0.046. The formula is an empirical formula obtained from a large number of experiments, and the influence of the sizes of the central intrados 101b in two directions on the shape is considered in a certain sense.

The design benefit lies in making the both ends staggered trompil 401d, the interface of 401e change along with central intrados 401b like this to guaranteed that the trompil 401e length that is located the medial zone is invariable, thereby obtained comparatively stable capillary effect, and the pressure that makes eyeball 200 receive is comparatively even, improves the comfort.

Such a design is defined as a uniform pressure design, which is another technical direction of the present embodiment, and the main focus is on user personalization and comfort, although the processing is more complicated, such a product is more suitable for personalized customized products.

Preferably, the straight line interface can be arranged at different positions in the uniform interface design.

In the past, the central extrados 401a has been made to adopt a flat shape similar to the central intrados 401b for high oxygen permeability, thereby ensuring that the lens has a thinner thickness and thus maintains oxygen permeability. The present embodiment ensures oxygen permeability through the opening, and further can break through the technical limitations of the prior art, and form the outer portion of the central correction portion 401 into a shape closer to the eyeball, and ventilate through the central through hole 401 c.

Although the central correction unit 401 cannot be provided with a through hole in order to achieve the compressive correction effect in the conventional technical concept, the compressive correction cannot be achieved, but the completely closed central correction unit 401 cannot perform efficient oxygen exchange at the through hole, and thus the oxygen permeability can be improved only by increasing the content of fluorine in the material, but the addition of fluorine easily causes a reduction in the strength of the lens body, which brings a new technical problem.

In the embodiment, the oxygen permeation and the rectification requirements are considered in a staggered hole opening mode, and meanwhile, the comfort level of a user is improved.

Preferably, peripheral extension 402 comprises: a peripheral extrados face 402a and a peripheral intrados face 402b, the peripheral intrados face 402b being a forward face; the peripheral extrados surface 402a is a forward arc surface. The peripheral extension 402 is mainly used to effectively wear the lens body to the eyeball 200.

The edge contact portion 403 includes: an edge intrados 403b, an edge extrados 403a, and a radiused edge 403c, the edge intrados 403b being a reverse arc. The edge extrados 403a is a forward extrados; a radiused edge 403c connects between the edge intrados 403b and the edge extrados 403 a. Preferably, the peripheral extension 402 has a plurality of peripheral through holes 402c passing through the inner and outer sides thereof.

In the previous design, the inner and outer sides of the peripheral extension 402 are reverse arc surfaces, so as to clamp the eyeball 200 by the elasticity of the lens; and the edge contact portion 403 adopts a reverse arc surface for tear discharge.

In the present embodiment, the forward arc surfaces are adopted, the inward arc surfaces 402b increase the tear storage space, and due to the presence of the peripheral through holes 402c, a certain suction force (generated by tear tension) is generated between the peripheral extension portion 402 and the eyeball 200, and due to the shape of the peripheral extension portion 402, the peripheral extension portion 402 can position the entire lens. Due to the design of the edge contact 403 and the shape and biomimetic design of the central extrados 301a of the central correction 401.

As a preferable aspect of the present embodiment, the peripheral extension 402 and the edge contact part 403 are configured as a multi-petal structure surrounding the central correction part 401, and specifically, as shown in fig. 5 and 6, the parts other than the central correction part 401 are configured as discontinuous structures, wherein a separation slit 405 is provided between one petal structure and the other petal structure to separate each petal structure from the other petal structure, the projected edge of the outer edge of each petal structure in a plane perpendicular to the central axis C3 is a circular arc, the arc value occupied by the projection slit ranges from 37 degrees to 45 degrees, and the projection edge are symmetrically arranged relative to the central axis C3, so that the oxygen permeability can be increased through the separation slit 405, and at the same time, due to the capillary action described above, the lens body 100 can be well bonded to the eyeball, the petal structures can be made of soft materials, which are relatively suitable for the requirement that adolescents do not develop and form, the natural growth of eyeballs is not influenced while shaping, and the service life is prolonged.

Preferably, the central correction portion 401 and the multi-lobed structural portion are made of two different materials, wherein the central correction portion 401 is made of a harder material for drilling and shaping, and the portions forming the multi-lobed structure are made of a softer material for machining.

As another extension, each flap edge of the multi-flap structure is composed of a soft material constituting the edge portion 406, which can be more flexibly coupled to the eyeball of the user.

By adopting the technical scheme, on the basis of realizing the correction effect, the wearing comfort is improved, and the oxygen permeation rate is improved. The orthokeratology mirror of the embodiment needs to be nursed when not in use to avoid the breeding of bacteria due to the pore structure.

Example four

Referring to the fourth embodiment shown in fig. 16, the remaining portions may be the same as those described above, except that the lens body 500 is provided with a through hole 501.

Specifically, the through hole 501 includes two sections 501a and 501b with different hole diameters, wherein the first section 501a is located at the opposite outer side, the second section 501b is located at the opposite inner side, the hole diameter of the first section 501a is larger than that of the second section 501b, the extending direction of the first section 501a is parallel to the second section 501b, and they are obliquely intersected with the central axis C4 of the lens body 500, and unlike the previous embodiment, the axis of the first section 501a is coincident with the axis of the second section 501b, which is staggered.

With such a scheme, a desired interface can be formed by pore diameter variation, and the capillary effect can be further improved.

EXAMPLE five

Referring to the fifth embodiment shown in fig. 17, the remaining portion can be the same as the above-mentioned one, except that the lens body 600 is provided with a through hole 601.

In particular, the through-hole 601 comprises three sections 601a, 601b, 601C extending in different directions, wherein the three sections may have the same aperture but all intersect obliquely with respect to the central axis C5.

The first section of hole 601a and the third section of hole 601c extend in the same direction, and the second section of hole 601b and the first section of hole 601a extend in different directions.

With such a design, the length of the through-hole can be extended, and direct impact of tear fluid on the through-hole 601 is avoided, and the multi-stage hole can also improve the capillary effect.

It should be noted that, in order to process a multi-step hole, the lens body 600 may be formed by combining two parts 600a and 600b, which may be formed by a bonding process after the hole is formed.

EXAMPLE six

Referring to the sixth embodiment shown in fig. 18, the remaining portions may be the same as those described above, except for the through hole 701 of the lens body 700.

Specifically, the through hole 701 includes two different sections 701a and 701b, wherein the first section 701a gradually shrinks in diameter from outside to inside (referring to the inside and outside of the lens body after wearing, rather than the inside and outside with reference to the lens body itself, the same applies below), and the second section 701b is reversed, and they intersect at the same interface (i.e. the narrowest point of the first section 701a coincides with the narrowest point of the second section 701 b). Preferably, the first-stage hole 701a and the second-stage hole 701b are both straight wall surfaces.

By adopting the scheme, the design of the hole wall plays a role in blocking from the inner side or the outer side, so that on one hand, the tear impact is buffered, and on the other hand, the capillary effect is improved.

As an extension, the first and second bore segments 701a, 701b may be configured as multi-step stepped bores.

EXAMPLE seven

Referring to a seventh embodiment shown in fig. 19, which is similar to the solution of the sixth embodiment, except that a lens body 800 is provided with a through hole 801 which comprises a first section of hole 801a and a second section of hole 801b, and a third section of hole 801C is arranged between the first section of hole 801a and the second section of hole 801b, the first section of hole 801a and the second section of hole 801b are similar to the sixth embodiment, and adopt a scheme of opposite gradually shrinking hole walls, except that a third section of hole 801C is arranged between the first section of hole 801a and the second section of hole 801b, the third section of hole 801C is a transition hole, the extending direction of the transition hole is parallel to the central axis C7, the transition hole does not adopt a scheme; the third section of holes 801c function to provide a buffer between the first section of holes 801a and the second section of holes 801b, and compared with the sixth embodiment, the tear interface is easier to stay in the third section of holes 801c, and a stable capillary effect is easier to obtain so as to buffer the impact of tears and achieve the hydrodynamic eye pulling effect.

Example eight

Referring to the eighth embodiment shown in fig. 20, a lens body 800 'is provided with a through hole 801' which is different from the eighth embodiment in that the inner transition section is eliminated, and the straight line section directly extends to the inner side.

Specifically, the through hole 801 'includes a first section of hole 801 a' and a second section of hole 801b ', wherein the first section of hole 801 a' has a hole wall gradually shrinking from outside to inside; the second-stage hole 801 b' is a through hole having a constant hole diameter parallel to the center axis C8. By adopting the scheme, the processing difficulty can be reduced, and simultaneously or better effect can be achieved, the inner gradually-changed hole is eliminated, and although the capillary effect is reduced, the scheme can effectively organize the outflow of tears.

Example nine

Referring to the eighth embodiment shown in fig. 21, a through hole 901 is formed in a lens body 900, the through hole 901 includes two portions 901a and 901b, the first section of hole 901a and the second section of hole 901b are opposite to the sixth embodiment, the first section of hole 901a adopts a scheme that the hole gradually expands from the outer side to the inner side, the second section of hole 901b adopts a scheme that the holes are opposite, and the maximum positions of the holes coincide.

With this arrangement, the amount of tear liquid stored can be increased, and the capillary effect can be improved by the change in the pore size.

As can be seen from the above embodiments, the through hole of the lens body has the following technical features: having a bore wall obliquely intersecting the central axis; have varying pore sizes, or internal dimensions; the interface of capillary effect is formed by dividing the whole through hole into two different parts by a discontinuous structure, such as a step or a bent hole wall.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A orthokeratology lens for correcting juvenile myopia, comprising: lens body, its characterized in that:

the lens body includes:

a central correction unit for correcting a central portion of an eyeball;

a peripheral extension for covering a peripheral portion of the eyeball;

an edge contact portion for contacting a peripheral portion of an eyeball;

wherein the peripheral extension is disposed between the central correction and the edge contact;

the central correction part is constructed in a symmetrical structure relative to the central axis and is provided with a plurality of central area through holes penetrating through the inner side and the outer side of the central correction part, the central area through holes are dislocation holes, and the extending direction of each section of dislocation hole is obliquely intersected with the central axis.

2. The orthokeratology lens of claim 1, wherein:

the central area through hole comprises two sections which are arranged in parallel.

3. The orthokeratology lens of claim 2, wherein:

the staggered direction of the two staggered parts of the through hole in the central area is perpendicular to the central axis.

4. The orthokeratology lens of claim 3, wherein:

the staggered two sections of the through hole in the central area are in the same shape.

5. The orthokeratology lens of claim 4, wherein:

the diameters of the staggered two sections of the through hole in the central area are the same.

6. The orthokeratology lens of claim 5, wherein:

the central zone through holes are uniformly formed in the central correction part.

7. The orthokeratology lens of claim 6, wherein:

the central area through holes are symmetrically arranged relative to the central axis.

8. The orthokeratology lens of claim 7, wherein:

and the two sections of the through holes in the central area are circular holes.

9. The orthokeratology lens of claim 7, wherein:

two sections of holes of the through hole in the central area are hexagonal holes.

10. The orthokeratology lens of claim 9, wherein:

the interface between the two sections of the central region through hole is perpendicular to the central axis.

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