CN215833716U - Cornea shaping mirror - Google Patents

Abstract

The utility model relates to a corneal shaping mirror, wherein a base arc area, a reversal arc area, a matching arc area and an extension area which are connected with each other are sequentially arranged on the inner surface of the corneal shaping mirror from the center to the outer periphery, a plurality of notches are arranged at intervals along the circumferential direction in the extension area, a reserved part is formed between every two adjacent notches, the inner surface of the reserved part is in smooth transition with the inner surface of the matching arc area, two side walls of each notch are provided with curved surface arc structures, and the curved surface arcs are convex towards the direction of the reserved part. According to the orthokeratology lens, the outermost edge area is an epitaxial area, gaps are formed in the epitaxial area and are arranged at intervals along the circumferential direction of the epitaxial area, a reserved portion is formed between every two adjacent gaps, oxygen permeation of the cornea is facilitated due to the arrangement of the gaps, and meanwhile the purpose of tear exchange is facilitated; the peripheral reservation portion of opening can play the effect of assistance-localization real-time, and need not to design the multistage arc in the adaptation arc district, and in addition, this reservation portion can share the eyelid to the pressure of lens, has reduced the damaged risk of extension district thinner part.

Description

Cornea shaping mirror

Technical Field

The utility model relates to the field of glasses, in particular to a cornea shaping mirror.

Background

A hard air-permeable contact lens (ortho-keratologylens) for shaping cornea is a specially designed hard contact lens, and clear vision can be obtained only by wearing the contact lens at night and taking off the contact lens in the morning. It adopts the design principle of 'reversal geometry' to make the inner surface of the cornea shaping mirror and the front surface of the cornea have the opposite geometrical shapes. A lacrimal fluid layer with uneven thickness exists between the lens and the cornea, and the epithelial cells in the center of the cornea are pulled to the middle periphery by the mechanical effect of the lacrimal fluid; at the same time, the eyelids press the lens to apply downward pressure to the cornea during the closed and blinking eyes. Under the action of the two effects, the center of the cornea becomes thinner and the middle periphery becomes thicker, so that the image point moves backwards to the retina, and myopic defocus is generated, thereby achieving the effects of correcting, preventing and controlling myopia. It is worth mentioning that this change in corneal shape is temporary, and after a period of wear, the cornea returns to its original shape.

The existing cornea shaping mirror has some defects in practical use, for example, in order to keep circulation of tears under the lens, a peripheral arc with a raised edge is required to be arranged, and the raised peripheral arc can cause the eyelid to push the shaping mirror to cause deflection in the moment; in order to ensure positioning, the adaptive arc area adopts a multi-arc-section design, and more interval joints can increase eyeball discomfort.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a keratoplasty mirror to address the above problems.

The utility model provides a plastic mirror of cornea, the internal surface of the plastic mirror of cornea sets gradually interconnect's base arc district, reversal arc district, joins in marriage suitable arc district and epitaxial district by the center to the periphery, epitaxial district sets up a plurality of openings along the circumference interval, and is adjacent form the reservation portion between the opening, the internal surface of reservation portion with the internal surface smooth transition who joins in marriage suitable arc district, two lateral walls of opening have curved surface arc structure, the curved surface arc to it is protruding to reserve the portion direction.

In one embodiment, the extension region is circumferentially provided with a plurality of concave parts, the reserved parts are formed between the concave parts, the concave parts are provided with the gaps, and the sum of the extension circumferential lengths of the plurality of concave parts is greater than the sum of the extension circumferential lengths of the plurality of reserved parts.

In one embodiment, the recessed portion includes an extension wall, the two sides of the extension wall are provided with the retaining portions, a projection of the extension wall on a plane perpendicular to the central axis of the orthokeratology mirror includes a first arc line and a second arc line, the first arc line is located at the outer edge of the recessed portion, the second arc line is located at the inner edge of the recessed portion, and the length of the first arc line is equal to the length of the second arc line.

In one embodiment, the plane of the extension wall is perpendicular to the central axis of the orthokeratology mirror.

In one embodiment, the extending wall is upwarped from the inner side to the outer side from the central axis of the orthokeratology mirror to form the gap with the inner narrow and the outer wide.

In one embodiment, the distance between the waist lines at two sides of the reserving part is less than the length of the outer edge of the bottom of the reserving part.

In one embodiment, the outer surface of the orthokeratology mirror is a convex surface with a single curvature.

In one embodiment, the radius of curvature of the convex curved surface is 0.15mm-0.32mm larger than that of the base arc area.

In one embodiment, the surface of the epitaxial region is a curved surface with a single curvature.

In one embodiment, the base arc area and the adaptive arc area are aspheric surfaces, and the aspheric surfaces refer to rotating surfaces formed by continuous and variable curvatures from vertexes to edges.

The utility model provides a moulding mirror of cornea, its inner surface sets gradually a plurality of interconnect region outwards by the lens center, and outermost edge region is epitaxial region, is equipped with the opening on the epitaxial region, and the opening sets up along epitaxial region circumference interval, forms the reservation portion between the adjacent opening, the internal surface of reservation portion and the internal surface smooth transition who adapts to the arc district, and two lateral walls of opening have curved surface arc structure, and the curved surface arc is protruding to the reservation portion. The cornea moulding mirror adopting the structure is convenient for oxygen permeation of the cornea and is convenient for achieving the aim of tear exchange; the peripheral reservation portion of opening can play the effect of assistance-localization real-time, and need not to design the multistage arc in the adaptation arc district, and in addition, this reservation portion can share the eyelid to the pressure of lens, has reduced the damaged risk of extension district thinner part.

Drawings

FIG. 1 is a schematic structural diagram of a conventional orthokeratology lens;

FIG. 2 is a front view of a orthokeratology lens according to one embodiment of the present application;

FIG. 3 is a schematic view of the inner surface of a orthokeratology lens in accordance with one embodiment of the present application;

FIG. 4 is a top view of a orthokeratology mirror according to one embodiment of the present application;

figure 5 is a cross-sectional view of a orthokeratology lens as shown in figure 3 according to one embodiment of the present application.

Wherein, 1, cornea;

10. the cornea shaping mirror comprises an existing cornea shaping mirror, 11 a base arc area of the existing cornea shaping mirror, 12 a reverse arc area of the existing cornea shaping mirror, 13 a positioning arc area of the existing cornea shaping mirror, 14 a peripheral arc area of the existing cornea shaping mirror, 141 and an upwarping end;

20. the utility model provides a plastic mirror of cornea, 21, the base arc district of the plastic mirror of cornea that this application provided, 22, the reversal arc district of the plastic mirror of cornea that this application provided, 23, the supporting arc district of the plastic mirror of cornea that this application provided, 24, the epitaxial region of the plastic mirror of cornea that this application provided, 241, depressed part, 242, the reservation, 243, the opening, 411, the extension wall, 412, first lateral wall, 413, the second lateral wall, 414, first pitch arc, 415, the second pitch arc, 421 (421'), the stringy, 422, bottom outer fringe, 25, the external surface of the plastic mirror of cornea that this application provided.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Fig. 1 shows a schematic structural diagram of a conventional orthokeratology mirror 10, which is arranged on a cornea 1 and specifically includes four regions: the base arc zone 11, also called as a central optical zone or a treatment zone, is used for flattening the cornea 1 and changing diopter; the reversal arc area 12 is used for accommodating a part of the cornea 1 transferred after the base arc area 11 is pressed, storing tears and changing the defocusing effect of the periphery of the cornea 1; the positioning arc area 13 is also called a matching arc area and is used for adjusting the positioning, the stability and the tightness of the lens; a peripheral arc 14 for tear exchange and comfort regulation.

The width of the base arc zone 11 is 5.5 mm-8.0 mm, most commonly 6 mm-6.5 mm, the larger the pupil, the wider the base arc zone 11 should be, and the higher the degree, the wider the base arc zone 11 should not be too large. The reversal zone 12 is steeper than the base zone 11 and the difference between the two arc curvatures is from 3.0D up to 15.0D, depending on the degree of myopia corrected and also on the corneal curvature at the base zone 11 and the positioning zone 13. The width of the reverse arc region 12 is 0.6mm to 1.0mm, and in some designs, the reverse arc region 12 is divided into two arcs with unequal radii of curvature to improve its connection with the base arc region 11 and the positioning arc region 13. The positioning arc 13 is designed so that the lens is parallel to the cornea 1 in this area. Since the cornea 1 tends to flatten generally from the center outward and the e-value distribution is not uniform, some designs divide the positioning arc 13 into multiple arcs to improve the fit of the lens positioning arc 13 to the cornea 1. The peripheral arc area 14 is flatter than the positioning arc area 13, a raised end 141 with one raised edge is generated at the outer edge of the lens, and the height of the raised end 141 is generally designed to be 60-70 μm, so that tear exchange is facilitated.

The existing cornea shaping mirror has some defects in practical use, for example, in order to keep circulation of tears under the lens, an upwarp end with a raised edge is required to be arranged on a peripheral arc area, and the eyelid can push the shaping mirror to cause deflection in the moment of vision; in order to ensure positioning, a multi-arc section design is required in the adaptive arc area, and more interval joints increase eyeball discomfort.

Fig. 2 shows a front view of a keratoplasty mirror according to an embodiment of the present application, fig. 3 shows a schematic view of an inner surface of the keratoplasty mirror according to an embodiment of the present application, fig. 4 shows a top view of the keratoplasty mirror according to an embodiment of the present application, fig. 5 shows a cross-sectional view of the keratoplasty mirror according to an embodiment of the present application, as shown in fig. 2-5, the inner surface of the keratoplasty mirror 20 provided by the present application is provided with a base arc zone 21, an inversion arc zone 22, a fitting arc zone 23 and an extension zone 24 which are connected with each other, and are arranged in a circular shape from the center to the periphery, the base arc zone 21 is located at the center of the keratoplasty mirror, and the base arc zone 21 is smoothly transited between the connected zones. Wherein the base-arc zone 21 is used for applanation of the cornea 1; the reversal arc 22 is used for accommodating the part of the cornea 1 transferred by the compression of the cornea 1; the adaptive arc area 23 is used for accurately attaching the orthokeratology mirror to the cornea 1, so that other functional areas can be accurately positioned at the preset position of the cornea 1; the extension area 24 is used for realizing the functions of tear exchange and auxiliary positioning, a plurality of gaps 243 are arranged at intervals along the circumferential direction, the gaps 243 are used for realizing tear exchange, a retention part 242 is formed between every two adjacent gaps 243, and the retention part 242 is used for realizing the function of auxiliary positioning. Furthermore, the gaps 243 are opened on the concave portions 241, the concave portions 241 are arranged at intervals along the circumferential direction of the extension region 24, and the retaining portions 242 are formed between the concave portions 241.

Further, the outer edge of the base zone 21 is connected to the counter zone 22 for applanation of the cornea 1. Optionally, the surface shape of the base arc region 21 is an aspheric surface with continuously changing curvature, and the surface curvature radius of the base spherical surface of the aspheric surface is 7.5mm-9.93 mm.

Further, the outer edge of the reverse arc 22 is connected to the adapting arc 23 for accommodating the portion of the cornea 1 displaced by the compression at the base arc 21. Alternatively, the surface of the reverse arc region 22 is a curved surface having a single curvature, and the radius of curvature of the curved surface is 5.6mm to 9.1 mm.

Further, the outer edge of the adaptive arc region 23 is connected with the recess 241 and the retaining portion 242 on the extension region 24, and mainly plays a role of positioning. This region is likewise designed to be aspherical in order to match the shape of the cornea 1 as closely as possible, but with a surface radius of curvature which differs from the radius of curvature of the base arc region 21. Optionally, the surface curvature radius of the base spherical surface of the aspheric surface of the adaptive arc zone 23 is 6mm to 9.78 mm.

Further, the surface shape of the extension region reserving part 242 is an aspheric surface, and the surface curvature radius of the base spherical surface of the aspheric surface is also 6mm to 9.78 mm. The extension region 24 is circumferentially provided with a plurality of concave portions 241, retaining portions 242 are formed between the concave portions 241, and openings 243 are formed in the concave portions 241 for achieving the purpose of tear exchange. Optionally, the sum of the extended circumferential lengths of the plurality of recesses 241 is greater than the sum of the extended circumferential lengths of the plurality of retention portions 242. The specific number of the plurality of recesses 241 and the plurality of retaining portions 242 is not limited in the present invention.

Referring to fig. 3 and 4, the recess 241 includes a first sidewall 412, a second sidewall 413, and an extending wall 411 located between the first sidewall 412 and the second sidewall 413. It should be noted that the first and second embodiments are only named for clarity of description, and are not specifically meant. Referring to figure 4, a top view of an orthokeratology lens of one embodiment of the present application, i.e., projected on a plane perpendicular to the central axis of orthokeratology lens 20, forms a first arc 414 at the outer edge of the plurality of recesses 241 and a second arc 415 at the inner edge of the plurality of recesses 241, optionally, the length of first arc 414 is equal to the length of second arc 415. Optionally, the spacing between first arc 414 and second arc 415 is 0.4mm-0.8 mm.

In one embodiment of the present application, the plane of the extension wall 411 is perpendicular to the central axis of the orthokeratology lens 20.

In another embodiment of the present application, the plane of the extending wall 411 is gradually raised from the inside to the outside from the central axis of the orthokeratology lens 20, and it is assumed that the bottom of the extension region 24 is taken as a reference plane, i.e. the outer edge of the extending wall 411 is gradually far away from the bottom of the extension region 24, and the gap 243 formed thereby is gradually widened from the inside to the outside from the central axis of the orthokeratology lens 20, thereby facilitating tear exchange. The structural principle of the device is similar to a Venturi effect, when liquid flows in a pipeline, the flow speed of the liquid rises due to the reduction of the area of the cross section of through flow at the narrowest part of the pipeline, and the circulation of tear can be better promoted, namely, the flow speed of the tear at the part of the gap 243 close to the cornea 1 is higher than the flow speed of the tear at the part of the gap 243 far away from the cornea 1.

Further, the opening 243 has a first side wall 412 and a second side wall 413, and the first side wall 412 and the second side wall 413 are curved arcs protruding towards the retention portion 242 on the respective sides, so that the area of the opening 243 is further increased, and the tear flow is improved.

With continued reference to fig. 4, the two sides of the retention portion 242 are provided with the waistlines 421 and 421 ', and the distance between the waistlines 421 and 421' at the two sides is smaller than the length of the outer edge 422 at the bottom of the retention portion 242, similar to a structure of a "flap", so that the retention portion is convenient to attach to the cornea, the stability of the auxiliary positioning function of the retention portion is improved, the pressure of the cornea and the eyelid on the epitaxial region is shared, and the risk of damage of the epitaxial region is reduced.

Optionally, the number and shape of the reserved portions 242 are not fixed, and are uniformly distributed on the epitaxial region 24. Of course, in some embodiments, the size and shape of the plurality of retaining portions 242 may be the same or different.

Further, the outer surface 25 of the orthokeratology lens 20 provided herein is a convex surface, optionally having a single curvature. Further, the radius of curvature of the outer surface 25 is 0.15mm to 0.32mm larger than that of the inner surface base arc region 21. By adopting the structure, the problem that the outer surface of the traditional orthokeratology lens is designed into a multi-section arc structure is avoided, so that the foreign body sensation of eyelids is increased, and the lens is easy to deviate in the moment of vision is avoided.

The utility model provides a moulding mirror of cornea, its inner surface sets gradually a plurality of interconnect region outwards by the lens center, and outermost edge region is epitaxial region, is equipped with the opening on the epitaxial region, and the opening sets up along epitaxial region circumference interval, forms the reservation portion between the adjacent opening, the internal surface of reservation portion and the internal surface smooth transition who adapts to the arc district, and two lateral walls of opening have curved surface arc structure, and the curved surface arc is protruding to the reservation portion. The cornea moulding mirror adopting the structure is convenient for oxygen permeation of the cornea and is convenient for achieving the aim of tear exchange; the peripheral reservation portion of opening can play the effect of assistance-localization real-time, and need not to design the multistage arc in the adaptation arc district, and in addition, this reservation portion can share the eyelid to the pressure of lens, has reduced the damaged risk of extension district thinner part.

Interpretation of terms:

the term "inner surface of the orthokeratology lens" is used in this application to refer to the surface of the orthokeratology lens that is in direct contact with the cornea of the human eye when worn.

The term "outer surface of the orthokeratology lens" is used in this application to refer to the surface opposite the inner surface of the orthokeratology lens.

The term "aspherical surface" is used in this application to refer to a surface shape which is a surface of revolution from apex to edge formed by a continuous, variable curvature.

The term "D" is used in this application as a term in keratology, and refers to Diopter, which is called Diopter throughout, and is the unit of the magnitude of the refractive power, denoted by D, i.e. it refers to the fact that parallel rays pass through the refractive substance, and the refractive power of the refractive substance is 1 Diopter or 1D when the focus is at 1 m.

The term "e" is used herein as a term in keratology to describe the degree of change in curvature from the center to the periphery of the cornea, with a large value of e representing a large difference between the center and the periphery, and conversely, a small difference.

The term "radius of curvature of the base spherical surface" is used in this application to refer to the radius of curvature of the apex of the aspherical surface.

The term "base curve zone" is used in this application to refer to the treatment zone of the inner surface of the orthokeratology lens, also known as the central optical zone.

The term "reversal arc" is used in this application to refer to the region of the inner surface of the orthokeratology lens that connects the base arc and the mating arc, and is steeper than the base arc, for accommodating the transferred corneal cells after being squeezed by the base arc.

The term "fitting arc zone" is used in this application to refer to the area of the inner surface of the orthokeratology lens immediately adjacent to the zone of reversal of the arc, which is flatter than the reversal of the arc and serves as a location for the lens when worn.

The term "extension zone" is used in this application to refer to the peripheral region of the inner surface of the orthokeratology mirror that is connected to the mating arc zone.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The utility model provides a plastic mirror of cornea, its characterized in that, the internal surface of the plastic mirror of cornea sets gradually interconnect's base arc district, reversal arc district, joins in marriage suitable arc district and epitaxial district by the center to the periphery, epitaxial district sets up a plurality of openings along the circumference interval, and is adjacent form the reservation portion between the opening, the internal surface of reservation portion with join in marriage the internal surface smooth transition in suitable arc district, two lateral walls of opening have curved surface arc structure, the curved surface arc to it is protruding to reserve the portion direction.

2. The orthokeratology mirror of claim 1, wherein the extension region is circumferentially provided with a plurality of indentations, the indentations define the retention portions therebetween, the indentations are provided with the gaps, and the sum of the circumferential lengths of the extensions of the plurality of indentations is greater than the sum of the circumferential lengths of the extensions of the retention portions.

3. The orthokeratology mirror of claim 2, wherein the depression comprises an extension wall flanked by the retaining portions, a projection of the extension wall onto a plane perpendicular to the central axis of the orthokeratology mirror comprising a first arc at an outer edge of the depression and a second arc at an inner edge of the depression, the first arc having a length equal to a length of the second arc.

4. The orthokeratology mirror of claim 3, wherein the plane of the extension wall is perpendicular to a central axis of the orthokeratology mirror.

5. The orthokeratology mirror of claim 3, wherein the extension wall is upwardly tilted from inside to outside from a central axis of the orthokeratology mirror to form the slit with a narrow inside and a wide outside.

6. The orthokeratology mirror of claim 2, wherein the distance between the waist lines on either side of the retention portion is less than the length of the outer edge of the bottom of the retention portion.

7. The orthokeratology lens of claim 1, wherein the outer surface of the orthokeratology lens is a convex surface having a single curvature.

8. The orthokeratology mirror of claim 7, wherein the radius of curvature of the convex curved surface is 0.15mm to 0.32mm greater than the radius of curvature of the base curve region.

9. The orthokeratology mirror of any of claims 1-8, wherein the surface of the epitaxial region is a curved surface having a single curvature.

10. The orthokeratology mirror of any of claims 1-8, wherein the base arc zone and the fitting arc zone are aspheric in surface form, the aspheric surface being a surface of revolution from apex to edge formed by a continuous, variable curvature.

Images