CN216772131U

CN216772131U - Scleral mirror

Info

Publication number: CN216772131U
Application number: CN202220471015.6U
Authority: CN
Inventors: 刘熠; 蔡勇; 尚利如; 崔秀国; 李国丹
Original assignee: Zhuhai Weishi Aikangte Pharmaceutical Technology Co ltd; Shanghai Aikangte Medical Technology Co ltd
Current assignee: Shanghai Aikangte Medical Technology Co ltd
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-06-17
Anticipated expiration: 2032-03-03

Abstract

The utility model provides a scleral lens, which is provided with an inner surface facing to a cornea when being worn and an outer surface opposite to the inner surface, and is characterized in that a central arc area, a middle circumference arc area which is arranged at the periphery of the central arc area and is annular, a transition arc area which is arranged at the periphery of the middle circumference arc area and is annular, and a landing arc area which is arranged at the periphery of the transition arc area and is annular are continuously formed on the inner surface from the center to the outside. According to the present invention, a scleral lens capable of improving the visibility of an object can be provided.

Description

Scleral mirror

Technical Field

The present invention relates generally to ophthalmic medical devices, and more particularly to a scleral lens.

Background

Contact lenses can correct refractive errors of the eye, and hard contact lenses are commonly used which are in direct contact with and worn on the cornea. However, since the cornea is rich in sensory nerve cells and is a relatively sensitive part of the human body, the direct wearing of the hard contact lens on the cornea easily causes a foreign body sensation or other uncomfortable symptoms, and these symptoms are more serious for patients suffering from corneal diseases (e.g., keratoconus, dry eye) and the like. In addition, it is difficult to obtain clear and comfortable corrected vision with ordinary hard or soft contact lenses for patients with refractive error of the abnormal cornea.

In view of the above problems, the prior art proposes scleral lenses that land on the sclera outside the limbus without contacting the cornea, and specifically, the diameter of the spectacle lens is increased to make the lens larger than the whole cornea, so that the contact point between the lens and the eye surface is changed from the cornea to the less sensitive sclera, thereby reducing the risk of damage to the pathological cornea and reducing the foreign body sensation. In particular, for some patients with damaged corneal tissue, the scleral lens can form an abundant tear space behind the lens, and a tear bath (tear bath) can protect the cornea and accelerate the healing of corneal epithelium. Moreover, since the scleral lens compensates for pathological corneal irregularities well, it is also particularly suitable for refractive errors caused by irregular corneas.

However, most of the conventional scleral lenses are arch-type landing sclera, which easily causes uneven contact between the scleral lens and the sclera, so that the contact pressure borne by the sclera is uneven, and the scleral lens is also relatively thick and heavy, thereby easily causing complications such as conjunctival staining.

In the conventional scleral lens, each arc region is generally designed to have a different arc shape, for example, a different radius of curvature, etc., in order to, for example, realize a different function, match different radii of curvature, etc., at different positions of the cornea. However, for the scleral mirror, adjacent arc regions may form a sharp point at the junction due to the difference in the arc shapes, which may result in poor visibility.

Disclosure of Invention

In view of the above-mentioned conventional circumstances, it is an object of the present invention to provide a scleral lens having an inner surface designed to be continuous and smooth to improve visibility.

The sclera lens is characterized in that a central arc area, a middle circumferential arc area which is arranged at the periphery of the central arc area and is annular, a transition arc area which is arranged at the periphery of the middle circumferential arc area and is annular, and a landing arc area which is arranged at the periphery of the transition arc area and is annular are continuously formed on the inner surface from the center to the outside, when the sclera lens is worn, a tear fluid space for containing tear fluid to form a tear lens for correcting vision is formed among the central arc area, the middle circumferential arc area, the transition arc area and the cornea, the landing arc area is contacted with a sclera, and on an XZ plane which is formed by taking the rise direction of the sclera lens as the Z axis direction, taking the width direction of the sclera lens as the X axis direction and taking the peak of the inner surface as the origin, the junction of two adjacent arc regions is formed into a smooth curve, and the inner surface satisfies:

wherein X is the perpendicular distance of a point on the inner surface from the Z axis, Z (X) is the perpendicular distance of a point on the inner surface from the X axis, r is the radius of curvature at the apex of the inner surface, e is the eccentricity at the apex of the inner surface, A_nM is not less than 4 for high-order coefficient, the inner surface has a plurality of reference points with the number not less than m, the plurality of reference points at least include a connection point between two adjacent arc areas and a boundary point of the inner surface, and the vertical distance of each reference point from the Z axis and the distance from the X axisThe vertical distance of the axis is obtained based on the corneal topography. In the scleral mirror according to the present invention, the inner surface is designed to be continuous and smooth, thereby improving the visibility.

In addition, in the scleral mirror according to the present invention, the inner surface is optionally designed to be a continuous curved surface having a predetermined shape based on a rise. In this case, it is possible to facilitate the scleral lens to be matched with the eyeball.

In the scleral mirror according to the present invention, the central arc region may be curved, and the middle peripheral arc region, the transition arc region, and the landing arc region may be linear, in a cross section of the scleral mirror along a rise passing through a center of the scleral mirror. Can help the scleral lens match with the eyeball.

In addition, in the scleral mirror according to the present invention, optionally, the distance between the mid-peripheral arc region and the anterior surface of the cornea gradually increases as it goes away from the lens center, and the distance between the transitional arc region and the anterior surface of the cornea gradually decreases as it goes away from the lens center. This can contribute to the matching of the mid-peripheral arc region with the cornea, and can reduce the lens displacement of the scleral lens and the generation of air bubbles under the lens.

In addition, in the scleral mirror according to the present invention, the distance between the central arc and the anterior surface of the cornea is optionally constant from the center of the central arc to the edge of the central arc. Therefore, the wearing comfort can be improved, and meanwhile, a good optical correction effect can be provided.

In addition, in the scleral mirror according to the present invention, optionally, the rise of the central arc region gradually decreases from the center of the central arc region to the edge of the central arc region at an increasing rate. In this case, a concave inner surface can be favored.

In addition, in the scleral lens according to the present invention, the central zone and the corresponding outer surface thereof may be formed as a first lens region, the intermediate zone and the corresponding outer surface thereof may be formed as a second lens region, the transition zone and the corresponding outer surface thereof may be formed as a third lens region, and the landing zone and the corresponding outer surface thereof may be formed as a fourth lens region, and the first lens region, the second lens region, the third lens region, and the fourth lens region may be formed as the scleral lens by connecting them in this order. In this case, the outer surface and the inner surface can be formed as one body, thereby forming a complete scleral mirror, whereby the stability of the scleral mirror can be improved.

In addition, in the scleral lens according to the present invention, the thickness of the scleral lens may be gradually increased from the first lens region to the third lens region and gradually decreased from a connection between the third lens region and the fourth lens region to a boundary of the scleral lens. Thereby, supporting the scleral lens across the cornea can be facilitated.

In addition, in the scleral mirror to which the present invention relates, optionally, a radius of curvature at the apex of the inner surface is obtained based on the diopter scale of the cornea and a desired corrective power.

According to the present invention, a scleral lens capable of improving the visibility of an object can be provided.

Drawings

Embodiments of the utility model will now be explained in further detail, by way of example only, with reference to the accompanying drawings, in which:

fig. 1 is a diagram illustrating an application scenario of a scleral mirror according to an example of the present invention.

Fig. 2 is a partial schematic view of the scleral landing zone shown in fig. 1.

Fig. 3 is a schematic perspective view showing a scleral mirror according to an example of the present invention.

FIG. 4 is a schematic design diagram showing the inner surface of a scleral mirror according to an example of the present invention.

Fig. 5 is a bottom view showing the inner surface of a scleral mirror according to an example of the present invention.

Fig. 6 is a cross-sectional view showing a scleral mirror according to an example of the present invention.

Fig. 7 is an explanatory diagram showing rise of the inner surface according to an example of the present invention.

Fig. 8 is an explanatory diagram showing rise of an outer surface according to an example of the present invention.

Description of reference numerals:

1 … a sclera lens of the human body,

10 … outer surface, 11 … optical zone, 12 … peripheral zone,

20 … inner surface, 21 … central arc, 22 … middle arc, 23 … transition arc, 24 … landing arc,

241 … limbal land, 242 … scleral land, 242a … contact,

the eye at 30 …, the cornea at 31 …, the sclera at 32 …,

40 … tear space.

Detailed Description

All references cited herein are incorporated by reference in their entirety as if fully set forth. Unless defined otherwise, 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.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. The drawings are schematic and the ratio of the dimensions of the components and the shapes of the components may be different from the actual ones.

The utility model relates to a scleral lens, in particular to a contact lens which is used for refractive correction and is in contact with the sclera when being worn. In the present invention, a scleral lens may be referred to as a "scleral contact lens" in some cases, and refers to a contact lens in which the lens completely covers the cornea and does not contact the cornea when worn, and the lens extends to contact the sclera. It should be noted that the scleral lens actually contacts the conjunctiva on the scleral surface when worn, but since the conjunctiva follows the shape of the sclera and has no actual structure, the lens positioned and contacting the conjunctiva on the scleral surface may be referred to as a scleral lens.

In the present invention, sclera may refer to the scleral tissue proximate to the limbus of the cornea.

In the present invention, the straight line type may be also referred to as a tangent line type, and the straight line type may be also referred to as a tangent line type.

In the present invention, the sagittal height may be the perpendicular distance between a point on the lens surface of the scleral lens to the lens diametric plane. That is, the rise may be the perpendicular distance from a point on the specular surface to the diameter (or radius) of the scleral mirror.

Hereinafter, the scleral mirror 1 according to the present invention will be described with reference to the drawings.

Fig. 1 is a diagram showing an application scenario of a scleral mirror 1 according to an example of the present invention. Fig. 2 is a partial schematic view of scleral landing zone 242 of fig. 1. Fig. 3 is a schematic perspective view showing a scleral mirror 1 according to an example of the present invention.

The scleral mirror 1 according to the present embodiment may include an outer surface 10 and an inner surface 20 (see fig. 1). Wherein the outer surface 10 may have a convex shape and the inner surface 20 may have a concave shape. As shown in fig. 1, when the scleral lens 1 is worn, the inner surface 20 may face the cornea 31 and the outer surface 10 may be opposite to the inner surface 20.

In the present embodiment, the eyeball 30 may include a cornea 31 and a sclera 32 (see fig. 1). When worn, the scleral lens 1 may completely cover the cornea 31 without contacting the cornea 31, and the scleral lens 1 contacts the sclera 32.

Fig. 4 is a schematic design diagram showing the inner surface 20 of the scleral mirror 1 according to an example of the present invention. Hereinafter, a design of the inner surface 20 of the scleral mirror 1 according to an example of the present invention will be described in detail with reference to fig. 4.

In the present embodiment, as shown in fig. 4, on an XZ plane constituted by taking the rise direction of the scleral mirror 1 as the Z-axis direction, the width direction of the scleral mirror 1 as the X-axis direction, and the apex of the inner surface 20 as the origin, the junction of two adjacent arc zones is formed as a smooth curve, and the inner surface 20 satisfies:

wherein X is the perpendicular distance of a point on the inner surface 20 from the Z axis, Z (X) is the perpendicular distance of a point on the inner surface 20 from the X axis, r is the radius of curvature of the inner surface 20 at the apex, e is the eccentricity of the inner surface 20 at the apex, A_nFor the high-order term coefficient, m is not less than 4, the inner surface 20 has a plurality of reference points in a number not less than m, the plurality of reference points includes at least a connection point between two adjacent arc regions and a boundary point of the inner surface 20, and a vertical distance of each reference point from the Z-axis and a vertical distance from the X-axis are obtained based on the corneal topography. In this case, the inner surface 20 is designed to be continuous and smooth, whereby the visual clarity of the scleral mirror 1 can be improved.

In some examples, in the example shown in fig. 4, P₁Is the boundary point P between the central arc zone 21 and the middle arc zone 22₂Is the boundary point P between the middle arc region 22 and the transition arc region 23₃The boundary point, P, between the transition arc 23 and the landing arc 24₄Is the interface between limbal land 241 and scleral land 242, P₅Which is a boundary point of the inner surface 20. The plurality of reference points may be selected from P₁、P₂、P₃、P₄And P₅At any point in (a). That is, x may be selected from P₁、P₂、P₃、P₄And P₅The corresponding x value. In the example shown in fig. 4, by acquiring a plurality of reference points whose number is not less than m, the set r, the set e, and the rise of the front surface of the cornea 31 corresponding to each reference point, the value of each An can be estimated, so that a continuous and smooth curve, that is, a design curve of the inner surface 20 can be fitted.

In some examples, the value of m may be determined based on the number of arc zones of the scleral mirror 1. In some examples, m may take on a value no less than the number of arc zones. In some examples, m may have a value of 4 to 10, e.g., m may have a value of 4, 5, 6, 7, 8, 9, or 10. However, this embodiment is not limited to this example, and m may take a value of 10 to 20 or more.

In some examples, the number of reference points is no less than m. That is, the number of reference points may be greater than or equal to m. This makes it possible to estimate the value of An from each of the sets of data.

In some examples, the radius of curvature of the inner surface 20 at the apex (which may also be referred to as the apex radius at the apex of the inner surface 20) may be obtained based on the refractive power of the cornea 31 and the desired corrective power. The correction power is understood to be a power required to adjust the refractive power of the eyeball to improve the visual acuity. In this case, by designing the vertex radius of the inner surface 20 based on the diopter scale of the cornea 31 and the desired correction power, the matching property of the scleral lens 1 with the eyeball 30 can be improved, and the refractive correction can be facilitated.

Fig. 5 is a bottom view showing the inner surface 20 of the scleral mirror 1 according to an example of the present invention. Fig. 6 is a cross-sectional view showing a scleral mirror 1 according to an example of the present invention.

In some examples, the inner surface 20 may be continuously formed from the center outward with a central arc zone 21, a mid-circumference arc zone 22 disposed at the periphery of the central arc zone 21, a transition arc zone 23 disposed at the periphery of the mid-circumference arc zone 22, and a landing arc zone 24 disposed at the periphery of the transition arc zone 23 (see fig. 5 and 6). In some examples, the mid-circumferential arc 22, the transition arc 23, and the landing arc 24 may be annular.

In some examples, as described above, on the XZ plane constituted with the rise direction of the scleral mirror 1 as the Z-axis direction, the width direction of the scleral mirror 1 as the X-axis direction, and the apex of the inner surface 20 as the origin, the junction of two adjacent arc regions of the scleral mirror 1 is formed as a smooth curve. That is, two adjacent regions between the central arc 21, the middle peripheral arc 22, the transition arc 23 and the landing arc 24 are smoothly connected.

In some examples, the central arc 21 may be the central zone of the lens through which ambient light passes into the pupil. In other words, the central arc 21 may correspond to the central region of the cornea 31. In some examples, the central arc 21 may provide the effect of correcting vision. That is, the central arc 21 may have a diopter that fits to the cornea 31. In some examples, the optical power of the central arc zone 21 may be adjusted by the sagittal height of the outer and

inner surfaces

10, 20. Therefore, the vision correction device can meet the requirements of various vision correction effects.

In other examples, the central arc 21 may not have the effect of correcting vision, in which case the scleral lens 1 may be used to treat corneal 31 disease.

In some examples, there may be a gap between the central arc 21, the mid-peripheral arc 22, and the transitional arc 23 and the cornea 31. When the scleral lens 1 is worn, a tear space 40 for accommodating tears to form a lachrymator for correcting vision may be formed between the central arc 21, the middle peripheral arc 22, the transitional arc 23, and the cornea 31. In some examples, the scleral lens 1 may be attached to the eyeball 30 by negative pressure created by tears. This can contribute to fixing the scleral mirror 1 to the eyeball 30.

In some examples, the central arc 21 may be curved in a cross section of the scleral mirror 1 along a rise passing through the center of the scleral mirror 1. That is, the central arc region 21 may be a curved surface (a curved surface formed by a curve). Thereby, the central arc 21 can be helped to provide an optical effect of correcting vision.

In some examples, the distance between the central arc 21 and the anterior surface of the cornea 31 remains constant from the center of the central arc 21 to the edge of the central arc 21. In this case, the form of the central arc 21 is adapted to the form of the front surface of the cornea 31, and tear fluid in the central arc 21 between the lens and the cornea 31 can be evenly distributed, thereby providing a better optical correction effect while improving wearing comfort.

In some examples, the thickness of the gap between the central arc 21 and the cornea 31 may be 150 μm to 300 μm. In this case, the tear layer between the central arc 21 and the cornea 31 can be made to have a constant thickness, and thus the incidence of lens sticking can be reduced, and visual disturbance can be reduced.

In some examples, the sagittal height of the central zone 21 decreases from the center of the central zone 21 to the edge of the central zone 21. In this case, the concave inner surface 20 can be facilitated. In some examples, the rise of the central arc 21 decreases at an increasing rate from the center of the central arc 21 to the edge of the central arc 21. In this case, the concave inner surface 20 can be facilitated.

In some examples, the diameter of the central arc 21 may be determined based on factors such as pupil size, anterior chamber depth, and tear layer thickness between the central arc 21 and the cornea 31. In addition, in some examples, for the purpose of reducing the impact on vision, it is preferable that the central arc 21 may completely cover the pupil, that is, the diameter of the central arc 21 may be the same as or slightly larger than the diameter of the pupil.

In some examples, the mid-circumferential arc 22 may be concentric with the central arc 21 and annularly around the outer circumference of the central arc 21. In some examples, the mid-peripheral arc 22 may smoothly connect the central arc 21 with the transition arc 23. This can improve the wearing comfort of the scleral lens 1.

In some examples, the central arc 21 may form central vision and the intermediate peripheral arc 22 may form peripheral vision when the pupil dilates. The extent of the central arc 21 and the intermediate arc 22 can be obtained from the acquired corneal topography.

In some examples, the central arc 21 and the mid-peripheral arc 22 may have different optical powers. When the scleral lens 1 is worn, light entering the human eye through the central arc 21 is focused on the retina, and light entering the human eye through the middle peripheral arc 22 is focused in front of the retina. In this case, myopic defocus can be formed in the periphery of the retina by wearing the scleral lens 1, so that the progression of myopia can be controlled or slowed at a colleague who can satisfy the demand for vision correction.

In some examples, the mid-circumferential arc region 22 may be linear in a cross section of the scleral mirror 1 along a rise passing through the center of the scleral mirror 1. That is, the middle peripheral arc region 22 may be a straight surface (a curved surface formed by a straight line). Thereby, the matching of the mid-peripheral arc region 22 with the cornea 31 can be facilitated.

In some examples, the distance between the mid-circumferential arc 22 and the anterior surface of the cornea 31 gradually increases with distance from the center of the lens. In this case, it is possible to facilitate the matching of the mid-peripheral arc region 22 with the cornea 31.

In some examples, the transition arc 23 may smoothly connect the mid-circumference arc 22 with the landing arc 24. This can improve the wearing comfort of the scleral lens 1.

In the present invention, the peripheral region of the cornea may be an annular region surrounding the central region of the cornea 31. In addition, a range of peripheral regions of the cornea may be obtained from the acquired corneal topography.

In some examples, the transition arc 23 may match the peripheral region of the cornea. In other words, the transitional arc zone 23 may correspond to the peripheral zone of the cornea. This makes it possible to design the transition zone 23 for the peripheral corneal region, and to better match the scleral mirror 1 to the cornea 31.

In some examples, the distance between the blend zone 23 and the anterior surface of the cornea 31 may gradually decrease away from the center of the lens. In this case, the gap between the transition arc zone 23 and the cornea 31 gradually decreases from the edge of the intermediate peripheral arc zone 22 to the boundary between the transition arc zone 23 and the landing arc zone 24, so that the tear space 40 can be reduced, and the amount of tears stored in the tear space 40 can be reduced, thereby reducing the lens offset of the scleral lens 1 and the generation of air bubbles under the lens.

In some examples, the distance between the blend zone 23 and the anterior surface of the cornea 31 may decrease away from the center of the lens and the magnitude of the decrease may increase or decrease. Thereby, it is possible to fit to the peripheral corneal region.

In some examples, the transition arc region 23 may be linear in a cross section of the scleral mirror 1 along a rise passing through the center of the scleral mirror 1. That is, the transition arc region 23 may be a straight surface (a curved surface formed by a straight line). This can facilitate the adaptation of the transition zone 23 to the cornea 31, i.e. the transition zone 23 can be adapted better to the peripheral region of the cornea.

In some examples, the mid-circumferential arc 22, the transition arc 23, and the landing arc 24 may be concentric with the central arc 21.

In this embodiment, the landing zone 24 may contact the sclera 32 when the scleral lens 1 is worn. Specifically, the landing arc 24 may have a contact portion 242a for contacting the sclera 32 (see fig. 2). When worn, the contact portion 242a may uniformly contact the sclera 32. This can evenly disperse the pressure of the scleral mirror 1 against the sclera 32.

In some examples, contact portion 242a may conform to the shape of sclera 32. In other words, contact portion 242a may conform exactly to the shape of the anterior surface of sclera 32. Thereby, the pressure of the scleral mirror 1 against the sclera 32 can be averaged, and the scleral mirror 1 can be supported across the cornea 31.

In some examples, the landing arc 24 may be linear in a cross-section of the scleral mirror 1 along a rise passing through the center of the scleral mirror 1. In some examples, the contact portion 242a may be formed in a straight line shape on a cross section of the scleral mirror 1 along a rise passing through the center of the scleral mirror 1. That is, the contact portion 242a may be of a straight-line design, in which case, since the sclera 32 near the corneoscleral limbus is of a straight-line shape, the straight-line design of the contact portion 242a can better match the shape of the sclera 32, i.e., can better contact and conform to the sclera 32. This can improve the matching between the sclera mirror 1 and the sclera 32, and can contribute to uniformly dispersing the pressure applied to the sclera 32, thereby improving the safety and comfort of the sclera mirror 1.

In other examples, the landing arc 24 may include a limbal landing zone 241 and a scleral landing zone 242. Wherein limbal land 241 may not contact cornea 31 and scleral land 242 may contact sclera 32 via contact 242 a. That is, the landing arc 24 may provide a region where the scleral lens 1 is positioned and contacted, wherein the region in contact with the sclera 32 is formed as the contact portion 242 a. Thus, the scleral lens 1 can contact only the sclera 32 across the cornea 31 and has a tear space 40 with the cornea 31, thereby being able to protect the cornea 31; in addition, even if the patient to be worn has a deformed cornea 31, the wearing of the scleral lens 1 is not affected.

In some examples, the limbal land area 241 may be matched to the limbus. In other words, the limbal land area 241 may correspond to the limbus. This enables the limbal land area 241 to be designed for the limbus, which enables the scleral mirror 1 to be better matched to the cornea 31. In the present invention, the limbus may be an annular region proximate the sclera 32. In addition, the extent of the limbus can be obtained from the acquired corneal topography.

In some examples, the limbal land area 241 may be a straight surface. In other words, the limbal land area 241 may be a curved surface formed by straight lines. That is, the limbal landing zone 241 may be formed linearly on a cross section of the scleral mirror 1 along a sagittal height passing through the center of the scleral mirror 1. Thereby, the landing zone 24 can be facilitated to match the cornea 31. That is, the limbal land 241 is better able to match the limbus.

In some examples, the limbal land area 241 may have a void. In some examples, the distance between the limbal land area 241 and the anterior surface of the cornea 31 may gradually decrease away from the lens center. In other examples, the limbal land area 241 may be in contact with the limbus. In other words, there may be no gap between the limbal land area 241 and the anterior surface of the limbus.

In some examples, scleral landing zone 242 may include only contact 242 a. In other words, scleral landing zone 242 may be comprised of contact portion 242 a.

In some examples, scleral landing zone 242 may include a temple (not shown). Additionally, the temple may not be in contact with the sclera 32. In other words, a temple may form an angle with sclera 32 and sclera 32. This can prevent the edge of the scleral mirror 1 from being fitted around the sclera 32. In other examples, the temple may be the portion of scleral landing zone 242 outward of contact 242 a. In other words, the edge warping portion may be provided at the outer circumference of the contact portion 242 a. In some examples, the edge warp may be formed in a straight line or a curved line on a cross section of the scleral mirror 1 along a rise passing through the center of the scleral mirror 1.

In some examples, the landing zone 24 may be connected to the outer surface 10. That is, the inner surface 20 and the outer surface 10 may be connected by an arc region. This enables the formation of the integrated scleral mirror 1.

In some examples, the central arc 21, mid-circumferential arc 22, transition arc 23, and landing arc 24 may be non-rotationally symmetric. That is, the inner surface 20 may have non-rotational symmetry. In other words, the central arc 21, the intermediate peripheral arc 22, the transition arc 23, and the landing arc 24 all have asymmetry. This enables formation of the scleral mirror 1 having region specificity.

In some examples, the non-rotational symmetry of the inner surface 20 may be designed based on the morphology of the eyeball 30. Thereby, the physiological structure of the eyeball 30 can be better conformed, so that the eyeball 30 can be better matched, and the pressure of the scleral lens 1 on the sclera 32 can be favorably averaged. In addition, in the present invention, non-rotational symmetry may refer to quadrant specificity.

In some examples, the scleral mirror 1 may be quadrant-specific designed. In this case, the quadrant-specific design of the scleral mirror 1 can improve the matching of the scleral mirror 1 in each quadrant to the eyeball 30 (including the cornea 31 and the sclera 32), since the more the cornea 31 is close to the periphery, the more the quadrant asymmetry of the cornea 31 is significant, as well as the sclera 32. In particular, the inner surface 20 of the scleral mirror 1 may be quadrant-specific designed to match the morphology of different quadrants of the eyeball 30.

In some examples, the inner surface 20 may have rotational symmetry. In other words, the inner surface 20 may not have quadrant specificity.

Fig. 7 is an explanatory diagram showing the rise of the inner surface 20 according to an example of the present invention. In fig. 7, the rise H of the inner surface 20 may be the perpendicular distance from a point on the inner surface 20 to the diameter D of the scleral mirror 1.

In some examples, the inner surface 20 may be designed to have a continuous curved surface of a predetermined shape based on the saggital height H. Wherein the sagittal height H can be obtained based on the sagittal depth of the eyeball 30. In this case, it is possible to facilitate the matching of the scleral lens 1 with the eyeball 30.

In other examples, the rise H of the inner surface 20 may gradually decrease from the center of the central arc 21 to the contact portion 242 a. This can contribute to the concave inner surface 20.

In the present embodiment, the scleral lens 1 has a convex outer surface 10 and a concave inner surface 20, wherein the inner surface 20 has a central arc 21 for correcting vision, a middle peripheral arc 22 surrounding the central arc 21 and having a ring shape, a transition arc 23 surrounding the middle peripheral arc 22 and having a ring shape, and a landing arc 24 surrounding the transition arc 23. This enables formation of the scleral lens 1 having an effect of correcting eyesight.

Fig. 8 is an explanatory diagram showing the rise of the outer surface 10 according to an example of the present invention. As shown in fig. 8, the sagittal height h of the outer surface 10 may be the perpendicular distance from a point on the outer surface 10 to the diameter D of the scleral mirror 1.

In some examples, the outer surface 10 may include an optical zone 11 (see fig. 3). Additionally, in some examples, optical zone 11 of outer surface 10 may correspond to central arc 21 of inner surface 20.

In some examples, the outer surface 10 may be substantially the same shape as the inner surface 20. That is, the outer surface 10 of the scleral mirror 1 may be designed parallel to the inner surface 20. In other examples, the outer surface 10 may be shaped differently than the inner surface 20. For example, the outer surface 10 may be spherical or the like.

In some examples, the outer surface 10 may also include a peripheral zone 12 (see fig. 3). Additionally, in some examples, peripheral zone 12 may surround optical zone 11 and be annular. In other examples, the peripheral region 12 may be connected to the landing arc 24.

In some examples, when the scleral lens 1 is worn, light entering the human eye via the optical zone 11 and the central arc zone 21 may be focused on the retina, and light entering the human eye via the mid-peripheral arc zone 22 and the peripheral zone 12 may be focused in front of the retina.

In some examples, the central zone 21 and its corresponding outer surface 10 are formed as a first lens area, the intermediate zone 22 and its corresponding outer surface 10 are formed as a second lens area, the transition zone 23 and its corresponding outer surface 10 are formed as a third lens area, and the landing zone 24 and its corresponding outer surface 10 are formed as a fourth lens area, the first lens area, the second lens area, the third lens area, and the fourth lens area being sequentially connected to form the scleral lens 1. In this case, the outer surface 10 and the inner surface 20 can be formed as one body, thereby forming the complete scleral mirror 1, whereby the stability of the scleral mirror 1 can be improved.

In some examples, the thickness of the scleral lens 1 gradually increases from the first lens area to the third lens area. In other words, the thickness of the scleral lens 1 may gradually increase from the center of the first lens area to the outer edge of the third lens area (away from the edge where the second lens area and the third lens area are connected). Thereby, it can be facilitated to support the scleral lens 1 across the cornea 31.

In some examples, the taper decreases from the junction of the third lens area and the fourth lens area to the boundary of the scleral mirror 1. That is, the thickness of the fourth lens region may taper in a direction away from the center of the lens.

In some examples, the thicknesses of the first lens region, the second lens region, and the third lens region may be substantially the same in some examples. In other examples, the thickness of the third lens region may be greater than the thickness of the first and second lens regions.

In some examples, the thickness of the first lens region may be in the range of 0.01mm to 0.1 mm. For example, the thickness of the first lens region may be 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, or 0.1 mm.

In some examples, the thickness of the second lens region may be in the range of 0.05mm to 0.2 mm. For example, the thickness of the second lens region may be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2 mm.

In some examples, the thickness of the third lens region may be in the range of 0.15mm to 0.3 mm. For example, the thickness of the third lens region may be 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm or 0.3 mm.

In some examples, the thickness of the fourth lens region may be in the range of 0.01mm to 0.3 mm. For example, the thickness of the fourth lens region may be 0.01mm, 0.03mm, 0.05mm, 0.07mm, 0.1mm, 0.13mm, 0.15mm, 0.17mm, 0.2mm, 0.23mm, 0.25mm, 0.27mm, or 0.3 mm.

In some examples, the scleral mirror 1 may be composed of a material having biocompatibility. Additionally, in some examples, the scleral mirror 1 may be composed of a hydrophilic material. In other examples, the scleral mirror 1 may be composed of a hydrophobic material.

In some examples, the scleral lens 1 may be a gas permeable rigid scleral 32 contact lens. In some examples, the scleral mirror 1 may be composed of a hard material. Thereby, a hard scleral 32 contact lens can be formed. Additionally, in some examples, the scleroscope 1 may be constructed of a hard, highly oxygen permeable material. In this case, it is possible to make the scleral mirror 1 have good oxygen permeability, to improve the abrasion resistance of the scleral mirror 1, and to facilitate the production of the scleral mirror 1.

In some examples, the scleral lens 1 may be composed of a hard high oxygen permeable material having an oxygen permeability coefficient (DK value) of not less than 100. For example, the scleral lens 1 may be composed of a hard high oxygen permeable material having an oxygen permeability coefficient of 100 to 200. For example, the oxygen permeability coefficient of the rigid, high oxygen permeable material may be 100, 125, 141, 150, 160, 180, or 200. That is, the oxygen permeability coefficient (DK value) of the scleral mirror 1 may be 100 to 200. Therefore, the scleral lens 1 has better oxygen permeability, so that tear can provide sufficient oxygen for the cornea 31, and further be beneficial to keeping the cornea 31 healthy.

In some examples, the center of the scleral mirror 1 (e.g., the portion comprising the central arc 21) may be comprised of a stiff material and the periphery of the scleral mirror 1 (e.g., the portion comprising the mid-peripheral arc 22, the transition arc 23, and the landing arc 24) may be comprised of a soft material. Thereby, a hybrid scleral 32 contact lens can be formed. In addition, in some examples, only the center of the scleroscope 1 may be composed of a hard, highly oxygen permeable material. In other examples, only the center of the scleral mirror 1 may be composed of a soft high oxygen permeable material.

In some examples, the scleral mirror 1 may be 0.2mm to 1.2mm thick. Therefore, the lens deformation of the scleral mirror 1 can be relieved, and the overweight of the scleral mirror 1 can be avoided.

In the present embodiment, the diameter of the scleral lens 1 can be selected according to the actual condition of the eyeball. For example, in some examples, the scleral mirror 1 may be 14.5mm to 16.5mm in diameter. Thereby spanning the cornea 31 and contacting the sclera 32. In addition, the edge of the large-diameter scleral lens 1 can be hidden under the eyelid, thereby enabling reduction of lens slippage due to eyelid movement. Additionally, in some examples, the diameter of the scleral mirror 1 may be 14.5mm, 15mm, 15.5mm, 16mm, or 16.5 mm.

According to the present invention, it is possible to provide the scleral lens 1 in which the inner surface 20 is designed to be continuous and smooth, and thereby, the wearing comfort and the visual acuity of the scleral lens 1 can be improved.

While the utility model has been described in detail in connection with the drawings and the embodiments, it is to be understood that the above description is not intended to limit the utility model in any way. Those skilled in the art can make modifications and variations to the present invention as needed without departing from the true spirit and scope of the utility model, and such modifications and variations are within the scope of the utility model.

Claims

1. A scleral lens, scleral lens have when wearing towards the inner surface of cornea, and with the relative surface of inner surface, its characterized in that, the inner surface from the center outwards continuously formed with central arc district, set up in central arc district periphery and be annular middle circumference arc district, set up in middle circumference arc district periphery and be annular transition arc district, and set up in transition arc district periphery and be annular landing arc district, when wearing the scleral lens, central arc district, middle circumference arc district, be formed with between transition arc district and the cornea and hold tear so as to form the tear space that is used for correcting the sight, landing arc district contacts with sclera;

on an XZ plane which is formed by taking a rise direction of the scleral mirror as a Z-axis direction, taking a width direction of the scleral mirror as an X-axis direction and taking a vertex of the inner surface as an origin, a joint of two adjacent arc zones is formed into a smooth curve, and the inner surface satisfies:

wherein X is the perpendicular distance of a point on the inner surface from the Z axis, Z (X) is the perpendicular distance of a point on the inner surface from the X axis, r is the radius of curvature at the apex of the inner surface, e is the eccentricity at the apex of the inner surface, A_nM is not less than 4 and is a high-order term coefficient,

the inner surface has a plurality of reference points not less than m in number, the plurality of reference points includes at least a connection point between two adjacent arc regions and a boundary point of the inner surface, and a vertical distance of each reference point from the Z axis and a vertical distance from the X axis are obtained based on the corneal topography.

2. The scleral mirror of claim 1, wherein the inner surface is designed to be a continuous curved surface having a predetermined shape based on a rise of the sagittal plane.

3. The scleral mirror of claim 1, wherein, in a cross section of the scleral mirror along a rise passing through a center of the scleral mirror, the central arc is curvilinear, and the mid-peripheral arc, the transition arc, and the landing arc are linear.

4. The scleral mirror of claim 1, wherein the distance between the mid-circumferential arc and the anterior surface of the cornea increases progressively further from the lens center, and the distance between the transitional arc and the anterior surface of the cornea decreases progressively further from the lens center.

5. The scleral mirror of claim 1, wherein the distance between the central arc and the anterior surface of the cornea remains constant from the center of the central arc to the edge of the central arc.

6. The scleral mirror of claim 1, wherein: the sagittal height of the central arc zone decreases gradually and at an increasing rate from the center of the central arc zone to the edge of the central arc zone.

7. The scleral lens of claim 1, wherein the central zone and its respective outer surface are formed as a first lens region, the mid-peripheral zone and its respective outer surface are formed as a second lens region, the transition zone and its respective outer surface are formed as a third lens region, the landing zone and its respective outer surface are formed as a fourth lens region, and the first lens region, the second lens region, the third lens region and the fourth lens region are sequentially connected to form the scleral lens.

8. The scleral lens of claim 7, wherein the scleral lens has a thickness that gradually increases from the first lens area to the third lens area and gradually decreases from a junction of the third lens area and the fourth lens area to a boundary of the scleral lens.

9. The scleral mirror of claim 1, wherein the radius of curvature at the apex of the inner surface is obtained based on the diopter power of the cornea and a desired corrective power.