CN107728338B

CN107728338B - Cornea shaping mirror

Info

Publication number: CN107728338B
Application number: CN201711276716.4A
Authority: CN
Inventors: 王曌; 解江冰
Original assignee: Abbott Beijing Medical Technology Co ltd
Current assignee: Abbott Beijing Medical Technology Co ltd
Priority date: 2017-12-06
Filing date: 2017-12-06
Publication date: 2024-01-26
Anticipated expiration: 2037-12-06
Also published as: CN107728338A

Abstract

The present invention relates to a cornea shaping lens comprising an inner surface facing the cornea of a human eye when worn and an outer surface opposite the inner surface, the inner surface comprising a centrally located base curve zone, wherein the base curve zone is for pressing and shaping the anterior surface of the cornea to have a shape conforming to the base curve zone, wherein the base curve zone comprises two or more regions, at least two of the two or more regions having different radii of curvature.

Description

Cornea shaping mirror

Technical Field

The present invention relates to a corneal shaping lens, and more particularly to a corneal shaping lens having a base curve region with more than one radius of curvature.

Background

Presbyopia is a visual problem that must occur after people walk into the middle-aged and elderly people. With age, the eye accommodation capacity gradually decreases to cause near vision difficulty for the patient, so that in near work, a convex lens is required to be added to the static refraction correction to have clear near vision, and the phenomenon is called presbyopia. With the improvement of the living standard of modern people, especially female loving beauty to middle-aged, the demands of the modern people on the image are increasingly increased, the modern people hope to keep young at any time, the modern people do not want to expose the presbyopic state, and the problem of presbyopia is more serious. At present, presbyopia is mainly solved by wearing presbyopic glasses, surgery, wearing multifocal contact lenses and the like. The external wearing mode such as external Dai Lao flower lenses or contact lenses worn in daytime has problems in terms of convenience, correction effect and correction stability, and especially the external Dai Lao flower lenses seriously affect the image of a wearer. The operation mainly refers to cornea implantation or implantation of various multifocal intraocular lenses, the correction modes are irreversible, damage is generated to human eye tissues, the problems of different degrees exist in terms of safety, people in the age group commonly reach the high cataracts, other eye treatments such as cataract surgery and the like are faced subsequently, and the operation modes bring serious trouble to the subsequent operation. Thus, there is a great need for a concealed, effective, safe presbyopia correction.

The cornea shaping is made of high oxygen permeability hard material, and the cornea shape is changed temporarily to change the ametropia temporarily. The reversible non-operative refractive correction product is usually in a night wearing mode (the user wears the glasses at night to sleep and takes off the glasses in daytime), the wearer thinks that the problem of own refractive error is cured after wearing the product, the product is not limited by any external condition in daytime, no additional trouble is caused compared with other vision correction means, and the product is a very excellent vision correction means.

The cornea shaping lens refraction correction principle is essentially different from that of a common cornea contact lens, the cornea shaping lens is worn at night, the optical zone does not play an optical role, and the front surface of the cornea is shaped into the shape of the rear surface (also called as a base arc zone) of the cornea shaping lens by wearing for a certain time, so that the refractive power of the cornea is changed, and the refraction correction effect is realized. If the curvature radius of the base arc area of the cornea shaping lens is flatter than that of the cornea, the function of correcting myopia is achieved; if the curvature radius of the base arc area of the cornea shaping lens is steeper than that of the flat axis of the cornea, the lens has the function of correcting hyperopia.

The development of the cornea shaping lens is divided into three-arc area, four-arc area, multi-arc area and other designs, the base arc area design is consistent and is a complete arc, the other arc sections form geometric design together, the auxiliary base arc is used for compressing and shaping cornea, so that the hydrodynamic force generated among the inner surface of the lens, tear fluid and cornea epithelium, the mechanical compression of the lens and the resultant force generated by eyelid movement apply force to the central area of cornea. Fig. 1 shows a schematic view of a cornea shaping mirror, where BC is the base curve region, RC is the reverse curve region, AC is the fitting curve region, and PC is the optional side curve region. The cornea shaping lens may also have no side arc regions, such as some cornea shaping lenses of a three-arc design, which fit into a straight arc where the arc is integral with the side arc.

The base arc area is the main treatment area of the cornea shaping lens, and the base arc area of the traditional cornea shaping lens is designed into a spherical surface, and the curvature radius of the base arc area is designed according to the degree-reducing requirement of a patient. Most of the existing cornea shaping lenses are designed for myopia correction. In the clinical use process, the cornea shaping lens can generate myopia-type peripheral defocus after being worn by partial patients and control the growth of the eye axis, so that the cornea shaping lens is mostly used for correcting and preventing teenagers from myopia, and WO2004/015479 discloses the cornea shaping lens for correcting hyperopia, wherein the base arc area of the cornea shaping lens is steeper than the cornea flat axis.

Hyperopia is essentially different from presbyopia, which is a refractive error, and presbyopia is a loss of accommodation. Presbyopic patients need to realize the function of near vision simultaneously under the condition of ensuring the clear far vision. At present, no cornea shaping lens can play a role in correcting presbyopia.

Disclosure of Invention

The invention provides a cornea shaping lens comprising an inner surface facing the cornea of a human eye when worn and an outer surface opposite the inner surface, the inner surface comprising a centrally located base curve region, wherein the base curve region is for pressing and shaping the anterior surface of the cornea to have a shape conforming to the base curve region, wherein the base curve region comprises two or more regions, at least two of the two or more regions having different radii of curvature.

In one embodiment, the two or more regions of the base arc region include a centrally located circular central region and one or more concentric annular regions surrounding the central region.

In one embodiment, the radii of curvature of two or more regions of the base arc zone exhibit an alternating radial variation.

In one embodiment, the radius of curvature of two or more regions of the base arc zone decreases gradually from the center outwardly.

In one embodiment, the diameter of the central region is greater than 1mm, preferably greater than 2mm.

In one embodiment, the two or more regions of the base arc region are two or more scalloped regions, and the two or more scalloped regions together comprise the base arc region.

In one embodiment, the two or more regions of the base arc region are two or more scalloped regions, the base arc region further comprising a smooth transition region between each two adjacent scalloped regions, and wherein the two or more scalloped regions and the smooth transition region together comprise the base arc region.

In one embodiment, two or more regions of the base arc region are irregularly shaped.

In one embodiment, the two or more regions of the base arc region are a first region located in the middle and second and third regions located on both sides of the first region, and the first region, the second region, and the third region together constitute the base arc region.

In one embodiment, the two or more regions of the base arc region are a first region in the middle and a second region and a third region on either side of the first region, the base arc region further comprising a first smooth transition region between the first region and the second region and a second smooth transition region between the first region and the third region, and wherein the first region, the second region, the third region, the first smooth transition region, and the second smooth transition region collectively comprise the base arc region.

In one embodiment, the two or more regions of the base arc region are a first region and a second region, the first region being a portion of a circular ring, the center of the second region having a full circular portion, and wherein the first region and the second region together comprise the base arc region.

In one embodiment, the two or more regions of the base arc region are a first region and a second region, the first region being a portion of a circle, the second region having a full circle portion in the center, the base arc region further comprising a smooth transition region between the first region and the second region, and wherein the first region, the second region, and the smooth transition region together comprise the base arc region.

In one embodiment, T is from +0.5D to +5.0D, preferably from +0.75D to +3.5D, more preferably from +1.0D to +3.0D, calculated from the formula:

wherein R is ₁ The unit is mm and R is the maximum curvature radius of the base arc area ₂ The unit is mm, n is the refractive index of cornea, and the value is 1.3375.

In one embodiment, the base arc zone has a maximum radius of curvature of 6.0mm to 10.5mm, preferably 7.0mm to 10.0mm.

In one embodiment, the minimum radius of curvature of the base arc zone is 5.51mm to 10.34mm, preferably 5.65mm to 9.85mm, more preferably 6.53mm to 9.71mm.

In one embodiment, the base arc zone has a diameter of 4.5mm to 7.0mm, preferably 5.0mm to 6.8mm, more preferably 5.2mm to 6.5mm.

In one embodiment, the base arc region is circular.

In one embodiment, the base arc region is elliptical.

The invention has at least the following advantages.

(1) The base arc area of the cornea shaping lens has more than one curvature radius, so that the cornea can form more than one focus after shaping, and the combined correction of ametropia and presbyopia is realized by wearing the lens at night and picking the lens in daytime, so that the cornea shaping lens is convenient, attractive and effective, and more accords with the pursuit of modern people on life quality.

(2) The correcting mode lenses such as the common frame presbyopic glasses, the common multifocal contact lenses and the like cannot keep synchronization with eyeballs, and the lenses are required to be continuously adjusted according to the positions of the lenses and the positions for watching things after the patients wear the lenses, or the lenses are in states such as glare, blurred vision, dizziness and the like when the lenses are not centered; when the cornea shaping lens is worn, the cornea shaping lens is naturally in an intermediate state, and no matter which direction the user looks in, the vision blurring caused by the position change of the lens cannot occur and the cornea shaping lens is not applicable.

(3) Presbyopia patients are older, mostly entering the cataracts advanced stage. The cornea cell-based activity of the invention is reversible correction, when the cornea is stopped for a period of time, the cornea can be restored to the original state without any damage, thus facilitating the subsequent other eye treatment of patients and being safer compared with the operation mode.

Definition of terms

Unless otherwise indicated, the following definitions apply to the terms used in this specification.

The base arc area (BC) is positioned at the most center of the cornea shaping lens and is the inner surface of the optical area, and is used for pressing the cornea front surface and shaping the cornea front surface into the shape of the cornea front surface, and the shaped cornea area is the optical area and plays a role in optical imaging.

The reverse arc Region (RC) is a second region closely connected with the base arc region, plays a role in connecting the base arc region and the adaptation arc region, forms a gap between the cornea shaping lens and the cornea front surface, and plays a role in storing tears and promoting tear circulation.

The adaptation Arc (AC), also called the locating arc, the matching arc, etc., is immediately adjacent to the reversing arc, which matches the shape of the cornea, and serves as a location.

The side arc area (PC) is optional and is positioned at the outermost edge of the cornea shaping lens, is tightly connected with the adaptation arc area, is generally flatter than the adaptation arc area, presents a certain tilting angle with the cornea surface, and ensures the exchange and circulation of the cornea, tear and oxygen around the shaping lens.

Near vision refers to looking near, generally about 30cm from the eye, and the corresponding vision is near vision.

Distance vision refers to looking at distance, typically about 5m from the eye, with the corresponding vision being distance vision.

The term "near" refers to the distance between the far and near eyes, generally the distance of about 30cm or less and within 5m from the eyes, and the corresponding vision is intermediate vision.

Furthermore, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the event of inconsistencies, the present description and the definitions included therein shall control.

Drawings

Fig. 1 schematically shows a cross-sectional side view of a cornea shaping mirror.

Fig. 2 schematically illustrates the base curve region of a cornea shaping mirror according to the present invention.

Fig. 3A schematically illustrates a base curve region of a cornea shaping mirror in accordance with a particular embodiment of the present invention.

Fig. 3B schematically illustrates a base curve region of a cornea shaping mirror in accordance with a particular embodiment of the present invention.

Fig. 4A schematically illustrates a base curve region of a cornea shaping mirror in accordance with a particular embodiment of the present invention.

Fig. 4B schematically illustrates a base curve region of a cornea shaping mirror in accordance with a particular embodiment of the present invention.

Fig. 5A schematically illustrates a base curve region of a cornea shaping mirror in accordance with a particular embodiment of the present invention.

Fig. 5B schematically illustrates a base curve region of a cornea shaping mirror in accordance with a particular embodiment of the present invention.

Fig. 5C schematically illustrates a base curve region of a cornea shaping mirror in accordance with a particular embodiment of the present invention.

Fig. 5D schematically illustrates a base curve region of a cornea shaping mirror in accordance with a particular embodiment of the present invention.

Detailed Description

The following specific examples are only for further illustration of the present invention, but the present invention is not limited to the following specific embodiments. Any variations on these embodiments which fall within the spirit and scope of the principles of the present invention are intended to be within the scope of the present invention.

The refractive state of the cornea is primarily determined by its radius of curvature. In practical clinical applications, the conversion relationship between the radius of curvature of the cornea and the refractive power of the cornea is commonly used:

（1）

wherein K is the diopter of the cornea, the unit is D, R is the radius of curvature of the front surface of the cornea, the unit is mm, and n is the refractive index of the cornea. For example, n may be 1.3375.

As shown in fig. 1, the cornea shaping lens includes an inner surface IS that faces the cornea of the human eye when worn and an outer surface OS opposite the inner surface. The inner surface IS of the cornea shaping lens comprises a base arc zone BC at the center, a circular reverse arc zone RC radially outward of the base arc zone BC, and a circular fitting arc zone AC radially outward of the reverse arc zone RC. In some embodiments, the inner surface IS of the cornea shaping lens may further comprise an annular side arc region PC located radially outward of the mating arc region AC. When worn, the base curve BC of the cornea shaping lens is in contact with the anterior surface of the cornea of the human eye. When the refractive error occurs to the patient, the curvature radius of the front surface of the cornea of the human eye is adjusted through the base arc zone BC of the cornea shaping lens, namely R in the above formula is adjusted, so that the correction of the refractive error of the human eye can be realized. In the following figures 2, 3A-3B, 4A-4B and 5A-5D, the base arc area BC is shown as being circular. However, in some embodiments, the base arc BC may also have other shapes, such as elliptical, oval, etc.

The invention creatively proposes that the base arc area of the cornea shaping lens has at least two different curvature radiuses, so that after the cornea shaping lens is worn by human eyes, at least two focuses are generated in the cornea optical area, and the ametropia and presbyopia of a patient can be corrected simultaneously.

In the cornea shaping lens according to the present invention, the base curve region includes two or more regions. At least two of the two or more regions of the base arc region have different radii of curvature. The surface shape of two or more regions of the base arc region may be spherical, or both be aspherical, or the surface shape of a portion of the regions may be spherical while the surface shape of the remaining regions may be aspherical. Fig. 2 shows that the base arc region includes four regions A, B, C and D. The four regions A, B, C and D can be any shape as desired. At least two of the four regions A, B, C and D have different radii of curvature.

In some embodiments, two or more regions of base arc region 100 include a centrally located circular central region 100 ₁ And surrounds the central region 100 ₁ Is defined by one or more concentric annular regions 100 ₂ 、100 ₃ 、100 ₄ …。

In some embodiments, two or more regions 100 of the base arc region 100 ₁ 、100 ₂ 、100 ₃ 、100 ₄ … exhibit an alternating radial change in radius of curvature. In particular, in some embodiments, the base arc region 100 has two different radii of curvature that exhibit an alternating radial variation, wherein the region 100 of the base arc region 100 _2m-1 Region 100 having a first radius of curvature and base arc region 100 _2m Has a second radius of curvature different from the first radius of curvature, where m is an integer greater than or equal to 1. In particular, in some embodiments, the base arc region 100 has three different radii of curvature that exhibit an alternating radial variation, wherein the region 100 of the base arc region 100 _3m-2 Region 100 having a first radius of curvature, base arc region 100 _3m-1 Has a second radius of curvature different from the first radius of curvature, and the region 100 of the base arc region 100 _3m And a third radius of curvature different from the first radius of curvature and the second radius of curvature, wherein m is an integer greater than or equal to 1. Of course, in other embodiments, the base arc region 100 may similarly have other numbers of different radii of curvature that alternate in the radial direction.

For example, in one embodiment, the cornea shaping lens 10 is made of a highly oxygen permeable rigid material. The inner surface of the cornea-shaping lens 10 includes a base curve region 100, a reverse curve region 200, a fitting curve region 300, and a side curve region 400. The total diameter of the cornea shaping lens 10 was 10.4mm, with the base curve region 100 having a diameter of 6.0mm, the inverted curve region 200 having an inner diameter of 6.0mm and an outer diameter of 7.8mm. The inner diameter of the mating arc region 300 is 7.8mm and the outer diameter is 9.4mm. The inner diameter of the side arc zone 400 is 9.4mm and the outer diameter is 10.4mm. The center thickness of the cornea shaping mirror 10 was 0.22mm.

In this embodiment, as shown in FIG. 3A, the baseThe arc region 100 includes a central region 100 ₁ And surrounds the central region 100 ₁ Is defined by three concentric annular regions 100 ₂ 、100 ₃ And 100 ₄ . Center region 100 ₁ Is 3mm in diameter. Annular region 100 ₂ The inner diameter of (2) is 3mm and the outer diameter is 4mm. Annular region 100 ₃ The inner diameter of (2) is 4mm and the outer diameter is 5mm. Annular region 100 ₃ The inner diameter of (2) is 5mm and the outer diameter is 6mm. Region 100 ₁ 、100 ₂ 、100 ₃ And 100 ₄ Exhibits an alternating change in radius of curvature, wherein the central region 100 ₁ And annular region 100 ₃ The radius of curvature of (a) is the same and may be, for example, 8.88mm, and the annular region 100 ₂ And 100 ₄ The radius of curvature of (c) is the same and may be 8.54mm, for example.

By wearing the cornea shaping lens 10, the cornea of the patient provides both the far and near foci after lens removal. Cornea is in contact with central region 100 ₁ And annular region 100 ₃ The refractive power of the corresponding two areas is 38.0D, and the correction of-5.0D myopia is realized, so that clear far vision is realized. Cornea in the annular region 100 ₂ And 100 ₄ The refractive power of the two corresponding areas is 39.5D, and the additional optical power of +1.5D is added on the basis of far vision, so that the function of correcting presbyopia is realized.

In the embodiment shown in fig. 3A, the base arc region includes three concentric annular regions. In addition, the base arc region may also include other numbers of concentric annular regions. In the embodiment shown in fig. 3A, the regions of the base arc zone alternate with two different radii of curvature, providing two focal points. Alternatively, each region of the base arc region may alternate with more than two different radii of curvature, thereby creating more than two foci. The diameter of the central region and the width of the annular region (i.e., half the difference between the outer and inner diameters) may be adjusted according to the pupil size of the patient, the near definition requirements, etc.

In some embodiments, two or more regions 100 of the base arc region 100 ₁ 、100 ₂ 、100 ₃ … the radius of curvature decreases gradually from the center outwards.

For example, in one embodiment, the cornea-shaping lens 10 is made of a high oxygen permeability material, including a base curve region 100, a reverse curve region 200, a fitting curve region 300, and a side curve region 400. The total diameter of the cornea shaping lens 10 was 10.9mm, with the base curve region 100 having a diameter of 6.5mm, the inverted curve region 200 having an inner diameter of 6.5mm and an outer diameter of 8.3mm. The inner diameter of the mating arc region 300 is 8.3mm and the outer diameter is 9.9mm. The inner diameter of the side arc zone 400 is 9.9mm and the outer diameter is 10.9mm. The center thickness of the cornea shaping mirror 10 was 0.22mm.

In this embodiment, as shown in FIG. 3B, the base arc region 100 includes a central region 100 ₁ And surrounds the central region 100 ₁ Is defined by four concentric annular regions 100 ₂ 、100 ₃ 、100 ₄ And 100 ₅ . Center region 100 ₁ Is 4mm in diameter. Annular region 100 ₂ The inner diameter of (2) is 4mm and the outer diameter is 4.5mm. Annular region 100 ₃ The inner diameter of (2) is 4.5mm and the outer diameter is 5mm. Annular region 100 ₄ Is 5mm in inner diameter and 5.5mm in outer diameter. Annular region 100 ₅ Is 5.5mm in inner diameter and 6.5mm in outer diameter. Region 100 ₁ 、100 ₂ 、100 ₃ 、100 ₄ And 100 ₅ Is tapered from the center to the outside. For example, a central region 100 ₁ May have a radius of curvature of 7.85mm, the annular region 100 ₂ May have a radius of curvature of 7.76mm, circular region 100 ₃ May have a radius of curvature of 7.67mm, circular area 100 ₄ May have a radius of curvature of 7.58mm, circular region 100 ₅ May have a radius of curvature of 7.50mm.

The cornea shaping lens 10 is capable of shaping a cornea of a wearer to have optical powers of 43.0D, 43.5D, 44.0D, 44.5D, 45.0D in order from center to edge, achieving progressive power, and achieving add power in the progressive +0.5D to +2.0D progression.

In the embodiment shown in fig. 3B, the base curve zone includes a central region and four concentric annular regions with radii of curvature gradually decreasing from the center outwardly to provide five different diopters. In addition, the base curve region may also include other numbers of concentric annular regions, thereby providing other numbers of different diopters. The diameter of the central region and the width of the annular region (i.e., half the difference between the outer and inner diameters) may be adjusted according to the pupil size of the patient, the near definition requirements, etc.

The near-sighted peripheral defocus refers to that the refractive power of the human eye optical system at the periphery is larger, and the formed focusing point falls before the retina, and clinical evidence shows that the near-sighted peripheral defocus can be used for controlling teenager myopia. The technical effects brought by the technical scheme of the invention also comprise: the cornea shaping lens can form myopia defocus, prevent the growth of the eye axis and delay the deepening of myopia when being worn by teenagers.

In some embodiments of the invention, the central region 100 ₁ Is greater than 1mm, preferably greater than 2mm.

In other embodiments of the present invention, the two or more regions of the base arc region are two or more scalloped regions that together comprise the base arc region. In other embodiments of the present invention, the two or more regions of the base arc region are two or more scalloped regions, the base arc region further comprises a smooth transition region between each two adjacent scalloped regions, and the two or more scalloped regions and the smooth transition region together comprise the base arc region.

For example, in one embodiment, the corneal shaping lens is made of a high oxygen permeability material, including a base curve region 100', a reverse curve region 200', a fitting curve region 300', and a side curve region 400'. The total diameter of the cornea shaping lens 10' was 10.6mm, with the base curve region 100' having a diameter of 6.2mm, the inverted curve region 200' having an inner diameter of 6.2mm and an outer diameter of 8.0mm. The inner diameter of the mating arc region 300' is 8.0mm and the outer diameter is 9.6mm. The inner diameter of the side arc zone 400' is 9.6mm and the outer diameter is 10.6mm. The center thickness of the cornea shaping lens was 0.16mm.

In one embodiment, as shown in FIG. 4A, two or more regions of the base curve region 100 'of the cornea shaping lens are sector regions 100' ₁ And 100' ₂ And sector area 100' ₁ And 100' ₂ Together forming a base arc region 100'. In this embodiment, sector area 100' ₁ Is 240 DEG and the sector 100' ₂ The central angle of (2) is 120 deg..

In one embodiment, as shown in FIG. 4B, two or more regions of the base curve region 100 'of the cornea shaping lens are sector regions 100' ₁ And 100' ₂ . The base arc region 100 'also includes a segment region 100' ₁ And 100' ₂ A smooth transition region 100 'therebetween' ₃ And 100' ₄ And sector area 100' ₁ And 100' ₂ A smooth transition region 100' ₃ And 100' ₄ Together forming a base arc region 100'. In this embodiment, sector area 100' ₁ Is 220 DEG and the sector 100' ₂ The central angle of (2) is 100 deg.. Sector area 100' ₁ Has a radius of curvature of 9.0mm and a scalloped region 100' ₂ Is 9.78mm. Smooth transition region 100' ₃ And 100' ₄ The central angles of (2) are all 20 degrees.

By wearing the cornea shaping lens, after the cornea is shaped, the refractive power of the far vision area is 37.5D, the refractive power of the near vision area is 34.5D, and the sector area 100' of the base arc area 100' of the cornea shaping lens ' ₁ And 100' ₂ Can provide +3.0D additional focal power for cornea, so that the wearer can achieve far vision and near vision bifocals at the same time, and the light energy ratio of the two focuses is 2.2:1. Since the two sector areas are joined by the smooth transition area, there is no obvious mark of zoning the cornea after the patient wears the device.

In the embodiment shown in fig. 4A, 4B, the base arc region includes two scalloped regions. In addition, the base arc region may also include more than two scalloped regions, thereby creating more than two foci. The central angles of the sector-shaped region and the smooth transition region can be adjusted as required.

In other embodiments of the present invention, two or more regions of the base arc region may be irregularly shaped.

For example, in one embodiment, as shown in fig. 5A, two or more regions of the base arc region 100″ are the first region 100' located in the middle. ₁ Located in said first region 100' ₁ Second regions 100 'on both sides' ₂ And a third zoneDomain 100' ₃ And a first region 100' ₁ A second region 100' ₂ And a third region 100' ₃ Together forming a base arc region 100'. In another embodiment, as shown in FIG. 5B, two or more regions of the base arc region 100″ are the first region 100' in the middle. ₁ Located in said first region 100' ₁ Second regions 100 'on both sides' ₂ And a third region 100' ₃ The base arc region 100″ may further include a first region 100'. ₁ And a second region 100' ₂ A first smooth transition zone 100 'therebetween' ₄ Located in the first region 100' ₁ And a third region 100' ₃ A second smooth transition zone 100 'therebetween' ₅ And a first region 100' ₁ A second region 100' ₂ Third region 100' ₃ A first smooth transition zone 100' ₄ And a second smooth transition zone 100' ₅ Together forming a base arc region 100'.

In the embodiment shown in fig. 5A, 5B, the first region 100' ₁ The radius of curvature of the second region 100 'is 7.30 mm' ₂ The radius of curvature of the third region 100 'is 7.00 mm' ₃ The radius of curvature of (2) is 7.63mm. After the cornea is shaped, the first region 100' ₁ Producing a power of 46.2D, second region 100' ₂ Resulting in 48.2D optical power, third region 100' ₃ Generating 44.2D optical power can realize whole-course vision of far vision, +2.0D middle vision and +4.0D near vision for human eyes.

In the embodiment shown in fig. 5A, 5B, two or more regions of the base arc region are three irregularly shaped regions. In addition, two or more regions of the base arc zone may also be other numbers of irregularly shaped regions, thereby creating other numbers of foci.

For example, in one embodiment, as shown in fig. 5C, two or more regions of the base arc region 100 '"are the first region 100'". ₁ And a second region 100' ₂ First region 100' ₁ Is part of a circular ring, the second region 100''. ₂ Has a complete circular portion in the centre of (a) and a first region 100' ' '. ₁ And a second region 100' ₂ Together forming a base arc region 100' ' '. In this embodiment, the first region 100' ' '. ₁ The radius of curvature of (2) is 7.50mm, the second region 100' ' '. ₂ Is 7.85mm. After the cornea is shaped, the first region 100' ' '. ₁ Generating a 45.0D power, second region 100''. ₂ Generating 43.0D refractive power can realize vision of far vision and +2.0D near vision for human eyes. First region 100' ₁ The central angle of (2) is 200 DEG and the second region 100' ' '. ₂ The central angle of (2) is 160 DEG and the second region 100''. ₂ Has a complete circular portion with a diameter of 2.0mm. In another embodiment, as shown in fig. 5D, two or more regions of the base arc region 100 '"are the first region 100'". ₁ And a second region 100' ₂ First region 100' ₁ Is part of a circular ring, the second region 100''. ₂ Has a complete circular portion in the center of the base arc region 100'″ and also includes a first region 100'. ₁ And a second region 100' ₂ A smooth transition region 100 'therebetween' ₃ And a first region 100' ₁ A second region 100' ₂ And a smooth transition region 100' ₃ Together forming a base arc region 100' ' '. In this embodiment, the first region 100' ' '. ₁ The radius of curvature of (2) is 8.44mm, the second region 100' ' '. ₂ The radius of curvature of (3) is 7.85mm, the third region 100' ' '. ₃ For a smooth transition the width is 0.1mm with a radius of curvature between the radii of curvature of the first and second regions. After the cornea is shaped, the first region 100' ' '. ₁ Producing a 40.0D optical power, second region 100' ₂ Generating 43.0D refractive power can realize vision of far vision and +3.0D near vision for human eyes. First region 100' ₁ The central angle of (2) is 220 DEG and the second region 100' ' '. ₂ The central angle of (a) is 120 DEG and the second region 100' ' '. ₂ The center has a complete circular portion with a diameter of 1.8mm.

In the embodiment shown in fig. 5C, 5D, two or more regions of the base arc region are two irregularly shaped regions. In addition, two or more regions of the base arc zone may also be other numbers of irregularly shaped regions, thereby creating other numbers of foci.

The maximum radius of curvature of the base arc region is determined according to the following formula:

（2）

obtained by combining the formula (1):

（3）

wherein n is the refractive index of the cornea, R is the original radius of curvature of the front surface of the cornea of the wearer, the unit is mm, the fatness K is the correction of ametropia, the unit is D, R ₁ The maximum radius of curvature of the base arc area is in mm. The original radius of curvature R and the correction of ametropia, father, K, of the anterior surface of the wearer's cornea can be measured using a computerized refractometer, an insert refractor, or the like.

The minimum radius of curvature of the base arc region is determined according to the following formula:

（4）

namely:

（5）

wherein n is the refractive index of the cornea, R ₁ The maximum radius of curvature of the base arc area is expressed in mm, the fatness correction amount required by the wearer is expressed in units of D and R ₂ The minimum radius of curvature of the base arc area is in mm.

The desired presbyopia correction amount T is determined for the wearer based on the degree of presbyopia of the wearer. If the wearer has a nearest distance M in mm based on correct correction of far vision, the amount of presbyopia correction required by the wearer is:

（6）

the normal human eye typically has a presbyopic correction of fatter from +0.5d to +5.0d.

In some embodiments, the refractive power K of the cornea of the human eye is 38.0D to 47.0D and the correction of refractive error is-6.0D to 1.0D, the maximum radius of curvature R of the base curve region can be calculated according to equation (2) ₁ From 6.0mm to 10.5mm. By combining the above ranges, the minimum radius of curvature R of the base arc region can be calculated according to formula (5) ₂ . Table 1 shows data according to some embodiments of the invention, wherein the refractive index n of the cornea is 1.3375.

TABLE 1 maximum radius of curvature R of the base arc region ₁ And a corresponding minimum radius of curvature R at different presbyopic correction amounts T ₂

In some embodiments of the invention, the cornea shaping lens achieves a presbyopia correction for the human eye of +0.5d to +5.0d, preferably +0.75d to +3.5d, more preferably +1.0d to +3.0d.

In some embodiments of the invention, the maximum radius of curvature of the base arc zone is 6.0mm to 10.5mm, preferably 7.0mm to 10.0mm.

In some embodiments of the invention, the minimum radius of curvature of the base arc zone is 5.51mm to 10.34mm, preferably 5.65mm to 9.85mm, more preferably 6.53mm to 9.71mm.

In some embodiments of the invention, the base arc zone has a diameter of 4.5mm to 7.0mm, preferably 5.0mm to 6.8mm, more preferably 5.2mm to 6.5mm.

Although the invention has been described with reference to exemplary embodiment(s), it will be understood by those skilled in the art that the invention is not limited to the precise construction and components described herein, and that various modifications, changes and variations may be apparent from the foregoing descriptions without departing from the spirit and scope of the invention as defined in the appended claims. The invention is not limited by the illustrated ordering of steps, as some steps may occur in different orders and/or concurrently with other steps. Therefore, it is intended that the invention not be limited to the particular embodiment(s) disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A cornea shaping lens comprising an inner surface facing the cornea of a human eye when worn and an outer surface opposite to the inner surface, the inner surface comprising a base curve zone at the center, wherein the base curve zone is configured to compress and shape the anterior surface of the cornea to have a shape conforming to the base curve zone, the shaped cornea zone being an optical zone that acts as an optical imaging, wherein the base curve zone comprises a central zone that is centrally located and circular and a ring zone that surrounds the central zone, wherein the radius of curvature of the central zone is greater than the radius of curvature of the ring zone, wherein the radius of curvature of the central zone is greater than the radius of curvature of the outer surface of the cornea of the human eye when worn.

2. The cornea shaping lens of claim 1, wherein the base curve region further comprises one or more concentric additional annular regions surrounding the annular region, the annular region and the additional annular regions having radii of curvature that taper outwardly from the center.

3. The cornea shaping mirror of claim 1, wherein the central region is greater than 1mm in diameter.

4. The cornea shaping mirror of claim 1, wherein the central region is greater than 2mm in diameter.

5. The cornea shaping mirror of claim 1, wherein Δt is +0.5d to +5.0d calculated from the formula:

6. The cornea shaping mirror of claim 1, wherein Δt is +0.75d to +3.5d calculated from the formula:

7. The cornea shaping mirror of claim 1, wherein Δt is +1.0d to +3.0d calculated from the formula:

8. The cornea shaping mirror of claim 1, wherein the base curve region has a maximum radius of curvature of 6.0mm to 10.5mm.

9. The cornea shaping mirror of claim 1, wherein the base arc region has a maximum radius of curvature of 7.0mm to 10.0mm.

10. The cornea shaping lens of claim 1, wherein the base curve region has a minimum radius of curvature of 5.51mm to 10.34mm.

11. The cornea shaping lens of claim 1, wherein the base curve region has a minimum radius of curvature of 5.65mm to 9.85mm.

12. The cornea shaping lens of claim 1, wherein the base curve region has a minimum radius of curvature of 6.53mm to 9.71mm.

13. The cornea shaping lens of claim 1, wherein the base arc region has a diameter of 4.5mm to 7.0mm.

14. The cornea shaping lens of claim 1, wherein the base arc region has a diameter of 5.0mm to 6.8mm.

15. The cornea shaping lens of claim 1, wherein the base arc region has a diameter of 5.2mm to 6.5mm.

16. The cornea shaping lens of claim 1, wherein the inner surface of the cornea shaping lens further comprises a reverse arc zone radially outward of the base arc zone and a fitting arc zone radially outward of the reverse arc zone, wherein the reverse arc zone is a zone in close proximity to the base arc zone and serves to connect the base arc zone and the fitting arc zone, a gap is formed between the cornea shaping lens and the anterior surface of the cornea, tear fluid is stored and tear fluid circulation is promoted, and the fitting arc zone is located in close proximity to the reverse arc zone and matches the shape of the cornea.

17. The cornea shaping lens of claim 16, wherein the inner surface of the lens further comprises a side arc region radially outward of the mating arc region, wherein the side arc region is flatter than the mating arc region and presents a flip angle to the surface of the cornea that ensures exchange and communication of tear and oxygen around the cornea and the lens.

18. The cornea shaping mirror of claim 1, wherein the surface shape of two or more regions of the base curve region are each spherical.

19. The cornea shaping mirror of claim 1, wherein the base curve region has two or more regions each with an aspherical surface.

20. The cornea shaping mirror of claim 1, wherein a face of a portion of two or more regions of the base curve region is formed as a sphere and a face of the remaining region is formed as an aspherical surface.

21. A cornea shaping lens comprising an inner surface facing the cornea of a human eye when worn and an outer surface opposite the inner surface, the inner surface comprising a centrally located base curve region, wherein the base curve region is for pressing and shaping the anterior surface of the cornea to have a shape conforming to the base curve region, the shaped cornea region being an optical region, functioning as an optical image, wherein the base curve region comprises three or more regions, at least two of which have different radii of curvature, wherein the three or more regions of the base curve region comprise a centrally located circular central region and two or more concentric annular regions surrounding the central region, wherein the radii of curvature of the three or more regions of the base curve region exhibit alternating radial variations, wherein the radius of curvature of the central region is greater than the radius of curvature of the outer surface of the cornea facing the human eye when worn.

22. The cornea-shaping mirror of claim 21, wherein the base arc region has two different radii of curvature that exhibit alternation in the radial direction.

23. The cornea-shaping mirror of claim 21, wherein the base arc region has three or more different radii of curvature that exhibit alternation in the radial direction.

24. The cornea shaping mirror of any of claims 21-23, wherein the central region has a radius of curvature that is greater than a radius of curvature of a circular ring region surrounding the central region.

25. The cornea shaping mirror of claim 21, wherein the central region is greater than 1mm in diameter.

26. The cornea shaping mirror of claim 21, wherein the central region is greater than 2mm in diameter.

27. The cornea shaping mirror of claim 21, wherein Δt is from +0.5d to +5.0d calculated from the formula:

28. The cornea shaping mirror of claim 21, wherein Δt is from +0.75d to +3.5d calculated from the formula:

wherein R is ₁ The unit is m, which is the maximum radius of curvature of the base arc aream，R ₂ The unit is mm, n is the refractive index of cornea, and the value is 1.3375.

29. The cornea shaping mirror of claim 21, wherein Δt is +1.0d to +3.0d calculated from the formula:

30. The cornea shaping mirror of claim 21, wherein the base curve region has a maximum radius of curvature of 6.0mm to 10.5mm.

31. The cornea shaping mirror of claim 21, wherein the base curve region has a maximum radius of curvature of 7.0mm to 10.0mm.

32. The cornea shaping lens of claim 21, wherein the base curve region has a minimum radius of curvature of 5.51mm to 10.34mm.

33. The cornea shaping lens of claim 21, wherein the base curve region has a minimum radius of curvature of 5.65mm to 9.85mm.

34. The cornea shaping lens of claim 21, wherein the base curve region has a minimum radius of curvature of from 6.53mm to 9.71mm.

35. The cornea shaping lens of claim 21, wherein the base arc region has a diameter of 4.5mm to 7.0mm.

36. The cornea shaping lens of claim 21, wherein the base arc region has a diameter of 5.0mm to 6.8mm.

37. The cornea shaping lens of claim 21, wherein the base arc region has a diameter of 5.2mm to 6.5mm.

38. The cornea shaping lens of claim 21, wherein the inner surface of the lens further comprises a reverse arc zone radially outward of the base arc zone and a mating arc zone radially outward of the reverse arc zone, wherein the reverse arc zone is a zone in close proximity to the base arc zone and serves to connect the base arc zone and the mating arc zone, a gap is formed between the lens and the anterior surface of the cornea, to store tears and promote tear circulation, and the mating arc zone is located in close proximity to the reverse arc zone and matches the shape of the cornea.

39. The cornea shaping lens of claim 38, wherein the inner surface of the lens further comprises a side arc region radially outward of the mating arc region, wherein the side arc region is flatter than the mating arc region and presents a flip angle to the surface of the cornea that ensures exchange and communication of tear and oxygen around the cornea and the lens.

40. The cornea-shaping mirror of claim 21, wherein the surface shape of two or more regions of the base curve region are each spherical.

41. The cornea-shaping mirror of claim 21, wherein the base curve region has two or more regions each with an aspherical surface.

42. The cornea shaping mirror of claim 21, wherein a face of a portion of two or more regions of the base curve region is formed as a sphere and a face of the remaining region is formed as an aspherical surface.