CN113031307A

CN113031307A - Lens in contact with sclera

Info

Publication number: CN113031307A
Application number: CN202110310917.1A
Authority: CN
Inventors: 谭鈳达; 朱绿荷; 孙鹏飞
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: 2020-07-22
Filing date: 2020-07-22
Publication date: 2021-06-25
Anticipated expiration: 2040-07-22
Also published as: CN113341591A; CN113625471A; CN113031306B; CN112394539B; CN113031306A; CN113703192A; CN113031307B; CN113341591B; CN112394539A

Abstract

The present disclosure provides a scleral contact lens comprising an outer surface having a convex shape and an inner surface having a concave shape, the inner surface having a central zone for correcting vision, a transition zone disposed at a periphery of the central zone, a landing zone disposed at a periphery of the transition zone, the landing zone having a contact portion for contacting with a sclera, wherein the inner surface is designed to have a continuous curved surface having a predetermined shape based on a sagittal height, the sagittal height is obtained based on a sagittal depth of an eyeball, the sagittal height of the inner surface is gradually reduced from a center of the central zone to the contact portion, the sagittal height of the inner surface is greater than the sagittal depth of the eyeball at the central zone, the sagittal height of the inner surface is equal to the sagittal depth of the eyeball at the contact portion, the landing zone comprises a limbal landing zone not contacting with the cornea and a scleral landing zone contacting the sclera through the contact portion, and the sagittal height of the contact portion is linearly decreased. According to the present disclosure, it is possible to provide a lens that can be well matched with the sclera and can uniformly disperse the pressure to which the sclera is subjected.

Description

Lens in contact with sclera

The application is filed asYear 2020, 07 months and 22 daysApplication No. is202010712536.1The invention is named asSclera of sclera Mirror and mirror matching method thereofDivisional application of the patent application.

Technical Field

The present disclosure relates to a lens for contacting the sclera.

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 all the contact points of the lens and the surface of the eye are changed from the cornea to the relatively insensitive sclera, thereby reducing the risk of damage to the pathological cornea and reducing the existence of 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.

Disclosure of Invention

In view of the above-described conventional circumstances, an object of the present disclosure is to provide a scleral mirror that can be well matched with the sclera and can uniformly disperse the pressure applied to the sclera. Through the scleral mirror that this disclosure relates to, can make the bearing on the sclera even to improve the comfort level of wearing this scleral mirror's patient.

To this end, the present disclosure provides in one aspect a scleral mirror comprising: an outer surface having a convex shape; and an inner surface which is concave and has a central zone for correcting vision, a transition zone which is provided at the periphery of the central zone and is annular, and a landing zone which is provided at the periphery of the transition zone and is annular, wherein the landing zone has a contact portion for contacting with a sclera, wherein the inner surface is designed to have a continuous curved surface of a predetermined shape based on a rise which is obtained based on a sagittal depth of an eyeball, the rise of the inner surface is gradually reduced from the center of the central zone to the contact portion, the central zone, the transition zone and the cornea have a gap, the landing zone includes a limbus landing zone which does not contact with the cornea and a sclera landing zone which contacts with the sclera through the contact portion, and the contact portion is formed in a straight line shape on a cross section of the sclera along the rise passing through the center of the sclera mirror.

In the present disclosure, the scleral lens has a convex outer surface and a concave inner surface, wherein the inner surface has a central zone to correct vision, an annular transition zone surrounding the central zone, and an annular landing zone surrounding the transition zone. This enables formation of a scleral lens having an effect of correcting eyesight. Moreover, the inner surface is a continuous curved surface having a predetermined shape designed based on the rise of the sagittal, and the rise of the sagittal can be obtained based on the depth of the sagittal of the eyeball, in which case, it is possible to facilitate fitting of the scleral lens to the eyeball, while designing the inner surface with the rise of the sagittal can facilitate fitting of the scleral lens and can solve problems such as curvature inaccuracy due to corneal damage to some extent. In addition, the landing zone can provide a region for the positioning and contact of the scleral lens, wherein the region in contact with the sclera is formed as a contact portion, and the landing zone comprises a limbal landing zone not in contact with the cornea and a scleral landing zone in contact with the sclera, and the rise of the inner surface gradually decreases from the center of the central zone to the contact portion, and the central zone, the transition zone and the cornea are both provided with a gap. Thus, the scleral lens can contact only the sclera across the cornea and have a tear space with the cornea, thereby being able to protect the cornea. Furthermore, in a cross section of the scleral lens along the rise passing through the center of the scleral lens, the contact portion is formed linearly, that is, the contact portion is designed linearly, and in this case, since the sclera near the corneoscleral edge is in a linear form, the linearly designed contact portion can be better matched with the form of the sclera, that is, can be better attached in contact with the sclera. From this, can improve the matching nature of scleral mirror and sclera to can help the pressure that evenly disperses the sclera and bear, and then can improve the security and the comfort level of scleral mirror.

Further, in a scleral mirror according to an aspect of the present disclosure, optionally, the sagittal height of the central region matches the sagittal depth of the central corneal region of the eyeball, and the sagittal height of the transition region matches the sagittal depth of the peripheral corneal region of the eyeball. In this case, the central zone can be designed for the central region of the cornea and the transition zone can be designed for the peripheral region of the cornea, whereby the scleral mirror can be better matched to the cornea.

Additionally, in a scleral mirror related to an aspect of the present disclosure, optionally, the sagittal height of the limbal land area matches the sagittal depth of the limbus of the eyeball, and the sagittal height of the scleral land area matches the sagittal depth of the sclera of the eyeball. In this case, the limbal land can be designed for the limbus and the scleral land can be designed for the sclera, whereby the scleral mirror can be better matched to the limbus and the sclera.

Further, in a scleral mirror according to an aspect of the present disclosure, optionally, in the central region, a sagittal height of the inner surface is greater than a sagittal depth of a central corneal region of the eyeball; in the transition zone, the sagittal height of the inner surface is greater than the sagittal depth of the peripheral corneal zone of the eyeball. This can provide a space with the cornea, thereby contributing to the formation of a tear space.

Further, in a scleral mirror according to an aspect of the present disclosure, optionally, the central region is a curvilinear surface, and the transition region, the limbal land region, and the scleral land region are rectilinear surfaces. In this case, it can be helpful for the central zone to provide an optical effect that corrects vision, and can facilitate the matching of the transition zone, limbal land zone with the cornea, and scleral land zone with the sclera.

In addition, in the scleral lens according to an aspect of the present disclosure, it is preferable that a boundary between the limbal land area and the scleral land area is a reference portion, and the contact portion is formed linearly from the reference portion on a cross section of the scleral lens along a rise passing through a center of the scleral lens. Thereby, the matching of the contact portion with the sclera can be facilitated.

Further, in a scleral mirror related to an aspect of the present disclosure, optionally, a portion of the scleral landing zone inward from the contact portion is not in contact with the sclera, and a portion of the scleral landing zone outward from the contact portion is not in contact with the sclera. Therefore, only the contact part of the scleral lens can be in contact with the sclera, and the sclera in contact with the contact part can be uniformly supported.

Further, in a scleral mirror according to an aspect of the present disclosure, optionally, the gap between the transition zone and the cornea is gradually reduced from the edge of the central zone to the boundary between the limbal land zone and the scleral land zone, and the gap between the limbal land zone and the cornea is gradually reduced from the boundary between the transition zone and the limbal land zone to the boundary between the limbal land zone and the scleral land zone. In this case, the tear space can be reduced, and the amount of tears stored in the tear space can be reduced, and the lens misalignment of the scleral lens can be reduced, and the generation of air bubbles under the lens can be reduced.

Further, in a scleral mirror according to an aspect of the present disclosure, optionally, a gap between the central region and the cornea remains substantially constant from a center of the central region to an edge of the central region. In this case, tear fluid in the central zone between the lens and the cornea can be evenly distributed, thereby providing a better optical correction.

In addition, in a scleral lens according to an aspect of the present disclosure, a thickness of the gap between the central region and the cornea may be 150 μm to 300 μm. In this case, the tear layer between the central zone and the cornea can be made to have a certain thickness, thereby reducing both the incidence of lens sticking and visual disturbance.

Further, in a scleral lens according to an aspect of the present disclosure, a tear space may be optionally formed between the inner surface and the eyeball. This can provide a tear layer between the inner surface and the eyeball, thereby contributing to the protection of the cornea.

In addition, in a scleral lens related to an aspect of the present disclosure, optionally, the scleral lens is attached to the eyeball by negative pressure formed by tears. This can help the scleral lens to be fixed to the eyeball.

In addition, in the scleral mirror related to one aspect of the present disclosure, optionally, the scleral mirror is composed of a hard high oxygen permeable material, and the hard high oxygen permeable material may be selected from at least one of siloxane methacrylate, fluorosilicone methacrylate, perfluoroether, and fluorinated siloxane. In this case, it is possible to make the scleral lens have good oxygen permeability, to improve the abrasion resistance of the scleral lens, and to facilitate the production of the scleral lens.

Further, in a scleral mirror according to an aspect of the present disclosure, optionally, the central zone, the transition zone, and the landing zone are rotationally asymmetric. This enables formation of a scleral mirror having region specificity.

Further, in a scleral mirror related to an aspect of the present disclosure, optionally, the non-rotational symmetry is designed based on a form of an eyeball. Therefore, the device can better conform to the physiological structure of the eyeball, can be better matched with the eyeball, and is favorable for averaging the pressure of the scleral lens on the sclera.

In addition, in a scleral lens according to an aspect of the present disclosure, the central zone and the corresponding outer surface thereof are optionally formed as a first lens area, the transition zone and the corresponding outer surface thereof are formed as a second lens area, the limbus land zone and the corresponding outer surface thereof are formed as a third lens area, the sclera land zone and the corresponding outer surface thereof are formed as a fourth lens area, and the first lens area, the second lens area, the third lens area, and the fourth lens area are sequentially connected to form the scleral lens. 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 a scleral lens according to an aspect of the present disclosure, optionally, a thickness of the scleral lens gradually increases from the first lens area to the third lens area, and a thickness of the fourth lens area gradually decreases from a connection of the third lens area and the fourth lens area to an outer edge of the fourth lens area. Thereby, supporting the scleral lens across the cornea can be facilitated.

Another aspect of the present disclosure provides a fitting method for a scleral lens, wherein the scleral lens includes: an outer surface having a convex shape; and an inner surface that is concave and has a central zone correcting vision, a transition zone disposed peripherally of the central zone and annular, a landing zone disposed peripherally of the transition zone and annular, the landing zone having a contact portion for contact with a sclera, and the landing zone including a limbal landing zone not contacting the cornea and a scleral landing zone contacting the sclera through the contact portion, the method of fitting comprising: determining a diameter of the sclera mirror; measuring a sagittal depth of an anterior segment of the eye consisting of a cornea and a sclera proximate to the cornea, the sagittal depth being a perpendicular distance from the cornea to a sclera diameter, the sclera diameter being equal to a diameter of the scleral lens; obtaining a rise of the scleral mirror based on the sagittal depth adjustment, wherein the rise of the contact portion decreases linearly from inside to outside; and preparing the scleral mirror according to the rise of the scleral mirror.

In this disclosure, obtain the rise parameter of scleral mirror according to the dark vector of cornea, the scleral mirror of preparation is recycled to the rise parameter that obtains, can help the scleral mirror and the eyeball of preparation to can help carrying out the fitting of scleral mirror to irregular cornea, also can solve the inaccurate scheduling problem of camber that the corneal injury leads to a certain extent.

Additionally, in a method of dispensing lenses according to another aspect of the present disclosure, optionally, the vector depth is obtained using optical coherence tomography. This enables accurate measurement of the sagittal depth of the anterior ocular segment.

Additionally, in a lens fitting method according to another aspect of the present disclosure, optionally, the vector depth includes a total vector depth from a corneal vertex to the scleral diameter, the scleral elevation includes a total vector height from a center of the scleral lens to the scleral diameter, the total vector height is greater than the total vector depth, and a difference between the total vector height and the total vector depth is 350 μm to 400 μm. In this case, the fitted scleral lens can be kept out of contact with the cornea, and the cornea can be protected.

Additionally, in a fitting method of another aspect of the present disclosure, optionally, the sagittal heights of the central zone, the transition zone, the limbal land zone, and the scleral land zone are derived based on the overall sagittal height of the scleral lens. Thereby, the parameter of the scleral lens matching the eyeball can be obtained.

Additionally, in a method of fitting a lens according to another aspect of the present disclosure, optionally, at the contact portion, the scleral landing zone has a sagittal height equal to the sagittal depth of the eyeball. Thereby, the contact portion can be brought into contact with the sclera.

Additionally, in a method of fitting a lens according to another aspect of the present disclosure, optionally, the power of the central zone is adjusted by the rise of the outer and inner surfaces. Therefore, the vision correction device can meet the requirements of various vision correction effects.

Additionally, in a lens fitting method according to another aspect of the present disclosure, optionally, the rise of the transition zone decreases linearly from the edge of the central zone to the intersection of the transition zone and the limbal land zone. Thereby, the tear space can be favorably reduced.

In addition, in a lens fitting method according to another aspect of the present disclosure, optionally, the rise of the central region gradually decreases from the center of the central region to the edge of the central region and the decreasing magnitude is increased. This enables forming a concave inner surface.

According to the scleral lens and the lens matching method thereof, the scleral lens can be well matched with the sclera, and the pressure borne by the sclera can be uniformly dispersed.

Drawings

Embodiments of the present disclosure 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 disclosure.

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

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

Fig. 4(a) is an explanatory view showing a rise of an inner surface to which an example of the present disclosure relates, and fig. 4(b) is an explanatory view showing a rise of an outer surface to which an example of the present disclosure relates.

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

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

Fig. 7 is a schematic diagram illustrating a rise change of an inner surface according to an example of the present disclosure.

Fig. 8 is a schematic diagram illustrating rise changes of a central region to which examples of the present disclosure relate.

Fig. 9 is a schematic diagram illustrating rise changes of a transition region to which examples of the present disclosure relate.

Fig. 10(a) is a schematic diagram illustrating the sagittal height change of the limbal land area to which examples of the present disclosure relate, and fig. 10(b) is a schematic diagram illustrating the sagittal height change of the scleral land area to which examples of the present disclosure relate.

Detailed Description

All references cited in this disclosure 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 disclosure belongs.

Hereinafter, preferred embodiments of the present disclosure 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.

Fig. 1 is a diagram showing an application scenario of a scleral mirror 1 to which an example of the present disclosure relates. 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 1 according to an example of the present disclosure.

The scleral mirror 1 according to the present embodiment may include an outer surface 10 and an inner surface 20. Wherein the outer surface 10 may have a convex shape and the inner surface 20 may have a concave shape. Additionally, the inner surface 20 may have a central zone 21, a transition zone 22, and a landing zone 23.

In some examples, the inner surface 20 may have a central zone 21 to correct vision, a transition zone 22 disposed at the periphery of the central zone 21, and a landing zone 23 disposed at the periphery of the transition zone 22. In addition, the transition zone 22 and the landing zone 23 may be annular. Further, the landing zone 23 may have a contact portion 232a (see fig. 2) for contacting the sclera 32.

In some examples, the inner surface 20 may be designed to have a continuous curved surface of a predetermined shape based on the rise H. The vector height H can be obtained based on the vector depth of the eyeball 30. In other examples, the rise H of the inner surface 20 may gradually decrease from the center of the central region 21 to the contact portion 232 a.

In some examples, there may be a gap between the central zone 21, the transition zone 22, and the cornea 31. In other examples, the landing zone 23 may include a limbal landing zone 231 and a scleral landing zone 232. In addition, landing zone 23 may not contact cornea 31, and scleral landing zone 232 may contact sclera 32 by contact portion 232 a. Further, on a cross section of the scleral mirror 1 along the rise passing through the center of the scleral mirror 1, the contact portion 232a may be formed linearly.

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 zone 21 for correcting vision, an annular transition zone 22 surrounding the central zone 21, and an annular landing zone 23 surrounding the transition zone 22. This enables formation of the scleral lens 1 having an effect of correcting eyesight.

In addition, the inner surface 20 is a continuous curved surface having a predetermined shape designed based on the rise H, and the rise H can be obtained based on the vector depth of the eyeball 30, in which case, it is possible to contribute to the fitting of the scleral mirror 1 to the eyeball 30, while designing the inner surface 20 with the rise H can facilitate the fitting of the scleral mirror 1 and can solve problems such as curvature inaccuracy due to the damage of the cornea 31 to some extent.

In addition, the land area 23 can provide an area where the scleral lens 1 is positioned and contacted, wherein the area contacted with the sclera 32 is formed as a contact portion 232a, and the land area 23 includes a limbus land area 231 not contacted with the cornea 31 and a sclera land area 232 contacted with the sclera 32, and the rise H of the inner surface 20 is gradually reduced from the center of the central area 21 to the contact portion 232a and the central area 21, the transition area 22 are both spaced from the cornea 31. 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 protecting the cornea 31.

Furthermore, in a cross section of the scleral lens 1 along the rise passing through the center of the scleral lens 1, the contact portion 232a may be formed linearly, that is, the contact portion 232a may be designed linearly, in which case, since the sclera 32 near the corneoscleral edge is in a linear form, the linearly designed contact portion 232a can be better matched with the form of the sclera 32, that is, can be better attached in contact with 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 the present disclosure, the scleral lens 1 is sometimes referred to as a "scleral contact lens," and the scleral lens 1 may refer to a contact lens in which the lens completely covers the cornea 31 and does not contact the cornea 31, and the lens extends and contacts the sclera 32. Moreover, the scleral lens 1 actually contacts the conjunctiva on the surface of the sclera 32 when worn, but since the conjunctiva does not have an actual structure following the shape of the sclera 32, the lens positioned and contacting the conjunctiva on the surface of the sclera 32 may be referred to as the scleral lens 1. Additionally, in the present disclosure, sclera 32 may refer to scleral tissue proximate to the corneoscleral limbus. Further, in the present disclosure, the straight line shape may also be referred to as a tangent line shape, and the straight line design may also be referred to as a tangent line design.

In the present disclosure, the sagittal height may be the perpendicular distance between a point on the mirror surface to the lens diameter plane. That is, the sagittal height may be the perpendicular distance from a point on the mirror surface to the lens diameter (or radius). For example, as shown in fig. 4(a), 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; as shown in fig. 4(b), the rise h of the outer surface 10 may be the perpendicular distance from a point on the outer inner surface 20 to the diameter D. In addition, as shown in fig. 7, the rise of the central region 21 may be H_CThe rise of the transition region 22 may be H_TThe rise of the limbal land 231 may be H_L1The rise of the scleral landing zone 232 may be H_L2。

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 contact lens. In some examples, the scleral mirror 1 may be composed of a hard material. Thereby, a rigid scleral 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. In other examples, 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, or 141.

In some examples, the stiff, highly oxygen permeable material may be selected from at least one of silicone methacrylate, fluorosilicone methacrylate, perfluoroether, fluorinated silicone.

In some examples, the center of the scleral mirror 1 (e.g., the portion comprising the central zone 21) may be comprised of a hard material and the periphery of the scleral mirror 1 (e.g., the portion comprising the transition zone 22 and the landing zone 23) may be comprised of a soft material. Thereby, a hybrid scleral 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 material comprising the scleral mirror 1 may also have precipitation resistance. Thereby, the protein precipitation resistance of the scleral lens 1 surface can be enhanced, and the life of the scleral lens 1 can be extended.

Further, 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. For example, the scleral mirror 1 may have a thickness of 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, or the like.

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, it is able to span the cornea 31 and contact 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.

In some examples, the oxygen permeability coefficient (DK value) of the scleral mirror 1 may be 100 to 200. Therefore, the tear liquid has better oxygen permeability, so that the tear liquid can provide sufficient oxygen for the cornea 31, and is favorable for keeping the cornea 31 healthy. For example, the oxygen permeability coefficient of the scleral mirror 1 may be 100, 105, 110, 115, 120, 125, 130, 135, 141, 145, 150, 155, 160, 165, 170, 175, 180, 185, 190, 195, or 200.

In some examples, as shown in fig. 2, when the scleral lens 1 is worn on the eyeball, the scleral lens 1 does not contact the cornea 31. Thus, even if the patient wearing the lens has a deformed cornea, the wearing of the lens 1 is not affected.

In some examples, the scleral lens 1 surface may be treated to increase the hydrophilicity of the scleral lens 1 lens. This improves the wettability of the surface of the scleral lens 1, thereby improving the wearing comfort. For example, the surface of the scleral mirror 1 may be subjected to plasma treatment, the surface of the scleral mirror 1 may be coated with a hydrophilic coating, or the like.

In some examples, the scleral lens 1 may be customized according to the physiological morphology of the eyeball 30. In particular, the inner surface 20 of the scleral lens 1 may be designed based on the morphology of the eyeball 30. This can contribute to matching the scleral lens 1 with the eyeball 30, and can enhance the comfort of wearing the scleral lens 1. In some examples, the scleral mirror 1 may be integrally formed.

In some examples, the scleral lens 1 may be adapted for use in patients with corneal disease to improve normal corneal function and vision, relieve pain, reduce light sensitivity, and the like. In other examples, the scleral lens 1 may be used for refractive correction of irregular corneas and for diseases such as exposed keratitis, severe corneal dryness, and the like.

In some examples, the scleral lens 1 may be suitable for dry eye, corneal injury, ommatidium deformity, ocular pemphigus, keratoconus, corneal ectasia, stevens-johnson syndrome, sjogren's syndrome, aniridia, neurotrophic keratitis, irregular astigmatism, post-corneal transplant complications, aberrated corneal implants, and the like.

In some examples, the scleral lens 1 may be worn after the lens of the scleral lens 1 is filled with saline or therapeutic solution. This can reduce the generation of bubbles under the lens.

Fig. 5 is a bottom view showing the inner surface 10 of the scleral mirror 1 according to an example of the present disclosure. Fig. 6 is a sectional view showing the scleral mirror 1 according to an example of the present disclosure.

In some examples, as described above, the scleral mirror 1 may have an inner surface 20 and an outer surface 10, and the inner surface 20 may be concave and the outer surface 10 may be convex.

In some examples, as shown in fig. 1, a tear space 40 may be formed between the inner surface 20 and the eyeball 30. This can provide a tear layer between the inner surface 20 and the eyeball 30, thereby contributing to protection of the cornea 31. In addition, the tear layer between the inner surface 20 and the eyeball 30 can neutralize irregular astigmatism of the irregular cornea, which can contribute to vision correction.

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 inner surface 20 may be designed to have a continuous curved surface of a predetermined shape based on the rise H (see fig. 5 and 6). In this case, it is possible to facilitate the fitting of the scleral lens 1 to the eyeball 30, while the use of the sagittal height design inner surface 20 can facilitate the fitting of the scleral lens 1 and can solve the problems of curvature inaccuracy and the like caused by the damage of the cornea 31 to some extent.

In other examples, the sagittal height may be obtained based on the sagittal depth of the eyeball 30, i.e., the sagittal height H of the inner surface 20 may be adjusted based on the corresponding sagittal depth of the eyeball 30. Additionally, in some examples, the rise height H of the inner surface 20 may taper from the center of the central region 21 to the edge of the land region 23 (see fig. 7).

In some examples, as shown in fig. 5, the inner surface 20 may include a central zone 21, a transition zone 22, and a landing zone 23. In other examples, as shown in fig. 5, the transition region 22 may be disposed at the periphery of the central region 21 and be annular. Additionally, in some examples, as shown in fig. 5, the landing zone 23 may be disposed at the periphery of the transition zone 22 and be annular.

In some examples, optionally, the central zone 21, the transition zone 22, and the landing zone 23 are non-rotationally symmetric. That is, the inner surface 20 may have non-rotational symmetry. In other words, the central zone 21, the transition zone 22 and the landing zone 23 all have an 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. Additionally, in the present disclosure, 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 to the eyeball 30 (including the cornea 31 and the sclera 32) in each quadrant, since the more the cornea is close to the periphery, the more the quadrant asymmetry of the cornea 31 is significant, as is the sclera.

In particular, the inner surface 20 of the scleral mirror 1 may be subjected to a quadrant specific design. In some examples, the inner surface 20 may be matched to the morphology of different quadrants of the eyeball 30 by a quadrant-specific design.

In some examples, the scleral mirror 1 may comprise a first quadrant and a second quadrant. Specifically, the inner surface 20 may include a first quadrant and a second quadrant. Additionally, in some examples, the inner surface 20 may be divided into a first quadrant and a second quadrant.

Additionally, in some examples, a first quadrant of the sclera mirror 1 may match the far nasal side of the eyeball 30, and a second quadrant may match the near nasal side of the eyeball 30. That is, the scleral lens 1 in the first quadrant may be designed based on the shape of the far nose side of the eyeball 30, and the scleral lens 1 in the second quadrant may be designed based on the shape of the near nose side of the eyeball 30. The far nasal side may be a side of the eyeball 30 close to the temple, and the near nasal side may be a side of the eyeball 30 close to the nose (far from the temple).

Specifically, the central zone 21, the transition zone 22, and the landing zone 23 in the first quadrant of the inner surface 20 may each be designed based on the morphology of the eyeball 30 on the far nasal side, and the central zone 21, the transition zone 22, and the landing zone 23 in the second quadrant may each be designed based on the morphology of the eyeball 30 on the near nasal side. In other words, the central zone 21, the transition zone 22, and the landing zone 23 in the first quadrant of the inner surface 20 may each match the distal nasal side of the eyeball 30, and the central zone 21, the transition zone 22, and the landing zone 23 in the second quadrant may each match the proximal nasal side of the eyeball 30.

In some examples, a first quadrant of inner surface 20 may mate with the upper lid side of eyeball 30 and a second quadrant may mate with the lower lid side of eyeball 30. The far nasal side may be a side of the eyeball 30 close to the upper eyelid, and the near nasal side may be a side of the eyeball 30 close to the lower eyelid (far from the upper eyelid).

In some examples, the scleral mirror 1 may further comprise a third quadrant and a fourth quadrant. Specifically, the inner surface 20 may include a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant. Additionally, in some examples, the inner surface 20 may be divided into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant.

In some examples, a first quadrant of inner surface 20 may match a superior side of eyeball 30, a second quadrant may match a nasal side of eyeball 30, a third quadrant may match an inferior side of eyeball 30, and a fourth quadrant may match a temporal side of eyeball 30. The upper side may be a side of the eyeball 30 close to the superior rectus muscle, the lower side may be a side of the eyeball 30 close to the inferior rectus muscle (away from the superior rectus muscle), the nasal side may be a side of the eyeball 30 close to the medial rectus muscle, and the temporal side may be a side of the eyeball 30 close to the lateral rectus muscle (away from the medial rectus muscle).

Specifically, the central zone 21, the transition zone 22, and the land zone 23 in the first quadrant of the inner surface 20 may each be designed based on the morphology of the eyeball 30 on the upper side, the central zone 21, the transition zone 22, and the land zone 23 in the second quadrant may each be designed based on the morphology of the eyeball 30 on the nasal side, the central zone 21, the transition zone 22, and the land zone 23 in the third quadrant of the inner surface 20 may each be designed based on the morphology of the eyeball 30 on the lower side, and the central zone 21, the transition zone 22, and the land zone 23 in the fourth quadrant of the inner surface 20 may each be designed based on the morphology of the eyeball 30 on the temporal side.

In some examples, a first quadrant of inner surface 20 may match an upper nasal side of eyeball 30, a second quadrant may match a lower nasal side of eyeball 30, a third quadrant may match a lower temporal side of eyeball 30, and a fourth quadrant may match an upper temporal side of eyeball 30. The upper side of the nose may be a side of the eyeball 30 near the superior rectus muscle and the medial rectus muscle, the lower side of the nose may be a side of the eyeball 30 near the medial rectus muscle and the inferior rectus muscle, the upper side of the temporal portion may be a side of the eyeball 30 near the lateral rectus muscle and the superior rectus muscle, and the lower side of the temporal portion may be a side of the eyeball 30 near the lateral rectus muscle and the inferior rectus muscle.

Specifically, the central zone 21, the transition zone 22, and the land zone 23 in the first quadrant of the inner surface 20 may each be designed based on the morphology of the eyeball 30 on the upper side of the nose, the central zone 21, the transition zone 22, and the land zone 23 in the second quadrant may each be designed based on the morphology of the eyeball 30 on the lower side of the nose, the central zone 21, the transition zone 22, and the land zone 23 in the third quadrant of the inner surface 20 may each be designed based on the morphology of the eyeball 30 on the lower side of the time, and the central zone 21, the transition zone 22, and the land zone 23 in the fourth quadrant of the inner surface 20 may each be designed based on the morphology of the eyeball 30 on the upper side of the time.

In some examples, the inner surface 20 may also include more quadrants. For example, the inner surface 20 may also include a fifth quadrant, a sixth quadrant, and so on. Additionally, in some examples, the inner surface 20 may also include a seventh quadrant and an eighth quadrant.

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

In some examples, central zone 21 may be the central zone of the lens through which ambient light enters the pupil. In other examples, the central zone 21 may provide vision correction effects. Additionally, in some examples, the central zone 21 may not have the effect of correcting vision, in which case the scleroscope 1 may be used to treat corneal diseases.

In some examples, the optical power of the central zone 21 may optionally 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 some examples, the diameter of central zone 21 may be determined based on factors such as pupil size, anterior chamber depth, and tear layer thickness between central zone 21 and cornea 31. Additionally, in some examples, for the purpose of reducing the impact on vision, it may be preferable that the central zone 21 completely cover the pupil, that is, the diameter of the central zone 21 may be the same as the diameter of the pupil.

Fig. 7 is a schematic diagram illustrating the rise change of the inner surface 20 according to an example of the present disclosure. Fig. 8 is a schematic diagram showing a rise change of the central region 21 according to an example of the present disclosure. Fig. 9 is a schematic diagram illustrating rise changes of the transition region 22 according to an example of the present disclosure.

In some examples, the central zone 21 may match the central zone of the cornea. In other words, the central zone 21 may correspond to the central region of the cornea. Additionally, in some examples, the sagittal height of the central region 21 may match the sagittal depth of the central corneal region of the eyeball 30. This enables the central region 21 to be designed and formed for the central region of the cornea, and enables the scleral mirror 1 to be better fitted to the cornea.

In the present disclosure, the central corneal zone may include a central optical zone and a paracentral zone. Wherein the central optical zone can provide central vision and the peripheral zone can provide peripheral vision when the pupil is dilated. The extent of the central optical zone and the paracentral zone may be obtained from the acquired corneal topography.

In some examples, in the central region 21, the sagittal height H of the inner surface 20 is greater than the sagittal depth of the eyeball 30. That is, in the central region 21, the sagittal height H of the inner surface 20 is greater than the sagittal depth of the central corneal region of the eyeball 30. Specifically, in the central region 21, the sagittal height H of the inner surface 20 is greater than the sagittal depth of the anterior surface of the central corneal region of the eyeball 30. Thereby, the inner surface 20 of the scleral lens 1 can be present with a gap to the cornea 31, thereby contributing to the formation of the tear space 40. In other words, the central zone 21 may be spaced from the cornea 31. That is, the central zone 21 may be spaced from the anterior surface of the cornea. Specifically, there may be a gap between the central zone 21 and the anterior surface of the central region of the cornea.

In some examples, optionally, as shown in fig. 8, the rise H of the central region 21_CGradually decreasing from the center of the central region 21 to the edge of the central region 21. This can contribute to the concave inner surface 20. In other examples, as shown in FIG. 8, the rise H of the central region 21_CThe magnitude of the decrease from the center of the central zone 21 to the edge of the central zone 21 increases. This can contribute to the concave inner surface 20. Additionally, in some examples, the central region 21 may be a curved surface. In other words, the central area 21 may be a curved surface formed by a curved line. Thereby, it can contribute to the central zone providing an optical effect of correcting vision.

In some examples, the gap between central zone 21 and cornea 31 may remain substantially constant from the center of central zone 21 to the edge of central zone 21. In this case, tear fluid in the central zone 21 between the lens and the cornea 31 can be evenly distributed, thereby providing a better optical correction.

In some examples, the thickness of the gap between the central zone 21 and the cornea 31 may be 150 μm to 300 μm. In other words, the thickness of the gap between the central region 21 and the anterior surface of the cornea may be 150 μm to 300 μm. In this case, the tear layer between central zone 21 and cornea 31 can be made to have a constant thickness, thereby reducing both the incidence of lens sticking and visual disturbance. For example, the thickness of the gap between the central zone 21 and the cornea 31 can be 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 210 μm, 220 μm, 230 μm, 240 μm, 250 μm, 260 μm, 270 μm, 280 μm, 290 μm, 300 μm, and the like.

In some examples, the transition region 22 may be adjacent to and concentric with the central region 21 (see fig. 5). In other examples, the transition zone 22 may smoothly connect the central zone 21 with the landing zone 23. This can improve the wearing comfort of the scleral lens 1.

In some examples, the transition zone 22 may match the peripheral zone of the cornea. In other words, the transition zone 22 may correspond to the peripheral zone of the cornea. Additionally, in some examples, the sagittal height of the transition zone 22 may match the sagittal depth of the peripheral corneal zone of the eyeball 30. This allows the transition zone to be designed for the peripheral region of the cornea, so that the scleral mirror can be better adapted to the cornea.

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

In some examples, the sagittal height H of the inner surface 20 may be greater than the sagittal depth of the eyeball 30 at the transition region 22. That is, in the transition region 22, the sagittal height H of the inner surface 20 may be greater than the sagittal depth of the peripheral corneal region of the eyeball 30. Specifically, in the transition region 22, the sagittal height H of the inner surface 20 may be greater than the sagittal depth of the anterior surface of the peripheral corneal zone of the eyeball 30. This can provide a gap with the cornea 31, thereby contributing to the formation of the tear space 40. In other words, a gap may exist between the transition zone 22 and the cornea 31. That is, the transition zone 22 may be spaced from the anterior surface of the cornea. Specifically, there may be a gap between the transition zone 22 and the anterior surface of the peripheral corneal zone.

In some examples, the rise H of the transition region 22_TMay taper from the edge of the central zone 21 to the intersection of the transition zone 22 and the limbal land area 231. Additionally, in some examples, optionally, as shown in fig. 9, the rise H of the transition region 22_TLinearly decreasing from the edge of the central zone 21 to the intersection of the transition zone 22 and the limbal land zone 231.

In some examples, the transition region 22 may be a straight surface. In other words, the transition region 22 may be a curved surface formed by straight lines. That is, the transition region 22 may be formed linearly on a cross section of the scleral mirror 1 along the rise passing through the center of the scleral mirror 1. This can facilitate the adaptation of the transition zone 22 to the cornea 31, i.e. the transition zone 22 can be better adapted to the peripheral region of the cornea.

In some examples, optionally, the gap between the transition zone 22 and the cornea 31 gradually decreases from the edge of the central zone 21 to the intersection of the limbal land zone 231 and the scleral land zone 232. In this case, the tear space 40 can be made small, and the amount of tear stored in the tear space 40 can be reduced, so that the lens misalignment of the scleral lens 1 can be reduced, and the generation of air bubbles under the lens can be reduced.

In some examples, the rise H of the transition region 22_TMay taper and decrease in magnitude from the edge of the central zone 21 to the intersection of the transition zone 22 and the limbal land area 231.

In some examples, the landing zone 23 may have a contact portion 232a for contacting the sclera 32. Additionally, in some examples, the landing zone 23 may include a limbal landing zone 231 and a scleral landing zone 232 (see fig. 6). In other examples, as shown in fig. 1, the limbal land area 231 may not be in contact with the cornea 31. In addition, the contact portion 232a may be used to support the scleral lens 1 across the cornea 31.

In some examples, the landing zone 23 may uniformly contact the sclera 32 forming the contact portion 232 a. This can evenly disperse the pressure of the scleral lens 1 against the sclera 32. In addition, the landing zone 23 actually contacts the conjunctiva over the surface of the sclera 32 (the conjunctiva is unstructured and follows the shape of the sclera 32). In addition, evenly distributing the pressure on the sclera can alleviate conjunctival staining, conjunctival whitening, lens adhesion, neovascularization, and the like.

In some examples, the limbal land 231 may smoothly connect the transition region 22 and the scleral land 232, that is, the limbal land 231 may be between the transition region 22 and the scleral land 232.

In some examples, the limbal land area 231 may be matched to the limbus. In other words, the limbal land area 231 may correspond to the limbus. Additionally, in some examples, the sagittal height of the limbal land 231 may match the sagittal depth of the limbus of the eyeball 30. This allows the limbal land 231 to be designed for the limbus, allowing the scleral mirror to better fit the cornea.

In the present disclosure, the limbus may be an annular region proximate the sclera 32. In addition, the extent of the limbus may be obtained from the acquired corneal topography.

In some examples, the sagittal height H of the inner surface 20 may be greater than the sagittal depth of the eyeball 30 at the limbal land area 231. That is, at the limbal land area 231, the sagittal height H of the inner surface 20 may be greater than the sagittal depth of the limbus of the eyeball 30. Specifically, at the limbal land area 231, the sagittal height H of the inner surface 20 may be greater than the sagittal depth of the anterior limbal surface of the eyeball 30. This can provide a gap with the cornea 31, thereby contributing to the formation of the tear space 40. In other words, there may be a gap between the limbal land 231 and the cornea 31. That is, the limbal land area 231 may be spaced from the anterior surface of the cornea. Specifically, a gap may exist between the limbal land area 231 and the anterior surface of the limbus.

In other examples, the limbal land area 231 may be in contact with the limbus. In other words, there may be no gap between the limbal land area 231 and the anterior surface of the limbus.

In some examples, as shown in fig. 10(a), the rise H of the limbal land 231_L1May taper from the interface of the transition zone 22 and the limbal land 231 to the interface of the limbal land 231 and the scleral land 232. Additionally, in some examples, optionally, as shown in fig. 10(a), the sagittal height H of the limbal land area 231_L1May decrease linearly from the intersection of the transition zone 22 and the limbal land 231 to the intersection of the limbal land 231 and the scleral land 232.

In some examples, the limbal land area 231 may be a straight surface. In other words, the limbal land area 231 may be a curved surface formed by a straight line. That is, the limbal land area 231 may be formed linearly in a cross section of the scleral mirror 1 along a rise passing through the center of the scleral mirror 1. Thereby, the transition zone 22 can be facilitated to match the cornea 31. That is, the limbal land area 231 is better able to match the limbus.

In some examples, optionally, the gap between the limbal land 231 and the cornea 31 may gradually decrease from the interface of the transition zone 22 and the limbal land 231 to the interface of the limbal land 231 and the scleral land 232 (see fig. 1). In this case, the tear space 40 can be made small, and the amount of tear stored in the tear space 40 can be reduced, so that the lens misalignment of the scleral lens 1 can be reduced, and the generation of air bubbles under the lens can be reduced.

In some examples, the rise H of the limbal land 231_L1May taper and decrease in magnitude from the interface of the transition zone 22 and the limbal land 231 to the interface of the limbal land 231 and the scleral land 232.

In some examples, the scleral landing zone 232 may be matched to the sclera 32. In other words, the scleral landing zone 232 may correspond to the sclera 32. Additionally, in some examples, the sagittal height of the scleral landing zone 232 may match the sagittal depth of the sclera 32 of the eyeball 30. As a result, the scleral landing zone 232 can be designed for the sclera 32, enabling a better scleral lens fit to the sclera. In other words, the scleral landing zone 232 is better able to mate with the sclera, i.e., the scleral landing zone 232 is better able to land on the sclera.

In some examples, the scleral landing zone 232 may contact the sclera 32. In other words, the scleral landing zone 232 may contact the anterior scleral surface. In other examples, the landing zone 23 may have a contact portion 232a for contacting the sclera 32. In other words, the scleral landing zone 232 may have a contact portion 232a for contacting the anterior surface of the sclera.

In some examples, contact portion 232a may conform to the shape of sclera 32. In other words, contact portion 232a may conform exactly to the shape of the anterior surface of sclera 32. Thereby, the pressure of the scleral lens 1 against the sclera 32 can be averaged, and the scleral lens 1 can be supported across the cornea 31.

In some examples, scleral landing zone 232 may include only contact 232 a. In other words, the scleral landing zone 232 may be comprised of the contact portion 232 a. In particular, the scleral landing zone 232 may be in contact with the sclera 32, i.e., the scleral landing zone 232 may be attached to the anterior scleral surface.

In some examples, the portion of scleral landing zone 232 inward from contact 232a may not be in contact with the sclera. Additionally, in some examples, a portion of scleral landing zone 232 outward from contact 232a may not be in contact with sclera 32. This enables the scleral lens 1 to be in contact with only the contact portion 232a and the sclera 32, and contributes to uniform weight bearing of the sclera 32 in contact with the contact portion 232 a.

In some examples, as shown in fig. 10(b), the sagittal height H of the scleral landing zone 232_L2May taper from the interface of the limbal land 231 and the scleral land 232 to the edge of the scleral land 232. Additionally, in some examples, optionally, as shown in fig. 10(b), the sagittal height H of the scleral landing zone 232_L2May decrease linearly from the intersection of the limbal land 231 and the scleral land 232 to the edge of the scleral land 232.

In some examples, contact portion 232a may be a contoured surface that conforms to sclera 32. In addition, in some examples, the contact portion 232a may be a curved surface formed by straight lines. In other words, the curved surface may be formed by straight lines. That is, on a cross section of the scleral mirror 1 along the rise passing through the center of the scleral mirror 1, the contact portion 232a may be formed linearly. In this case, since the sclera 32 near the corneoscleral limbus is in a straight line shape, the contact portion 232a formed by the straight line can be better matched with the shape of the sclera 32, that is, can be better attached in contact with 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.

Specifically, the anterior scleral surface is a linear surface formed by a straight line, and the contact portion 232a is a curved surface formed by a straight line, so that the curved surface can be favorably attached to the anterior scleral surface, in other words, the contact portion 232a can be favorably matched with the sclera 32, and thus, the pressure on the sclera 32 can be favorably evenly dispersed, and the safety and comfort of the scleral lens 1 can be improved.

In some examples, optionally, with the boundary of the limbal land region 231 and the scleral land region 232 being a reference portion, the contact portion 232a is formed in a straight line shape starting from the reference portion on a cross section of the scleral mirror 1 along a rise passing through the center of the scleral mirror 1. Thereby, the contact portion 232a can be facilitated to be matched with the sclera.

In some examples, contact portion 232a optionally contacts sclera 32 to a certain extent. For example, contact portion 232a may have a wide range of contact with sclera 32. Thereby, the local area of the sclera 32 is relieved of pressure and comfort of wear is increased.

In some examples, at contact 232a, the sagittal height H of scleral landing zone 232_L2May be equal to the sagittal depth of the eyeball 30. In other words, at the contact portion 232a, the rise H of the scleral landing zone 232_L2May be equal to the sagittal depth of the anterior surface of the sclera. Thereby, the contact portion 232a can be brought into contact with the sclera 32.

In some examples, in the scleral landing zone 232, the rise from the intersection of the scleral landing zone 232 and the limbal landing zone 231 to the contact 232a and the rise of the contact 232a may decrease linearly at a first rate. Additionally, in some examples, the rise of the portion of the scleral landing zone 232 outward from the contact portion 232a may decrease linearly at a second rate. In other examples, the first rate may or may not be the same as the second rate. For example, the first rate may be greater than the second rate.

In some examples, the sagittal height H of the inner surface 20 is greater than the sagittal depth of the eyeball 30 at a portion of the scleral landing zone 232 inward from the contact portion 232 a. Thereby, a gap can be provided with the sclera 32. In other words, a gap may exist between the portion of the scleral landing zone 232 inward from the contact portion 232a and the cornea 31. Additionally, in some examples, a gap may be formed between a portion of scleral landing zone 232 inward from contact 232a and sclera 32.

In some examples, the gap between the portion of scleral landing zone 232 inward from contact portion 232a and sclera 32 may gradually decrease. That is, the gap between the scleral landing zone 232 and the sclera 32 gradually decreases from the interface of the limbal landing zone 231 and the scleral landing zone 232 to the contact portion 232 a.

In some examples, the sagittal height H of the inner surface 20 may be greater than the sagittal depth of the eyeball 30 at a portion of the scleral landing zone 232 outward from the contact portion 232 a. Thereby, a gap can be provided with the sclera 32. In other words, a gap may exist between the portion of the scleral landing zone 232 outward from the contact portion 232a and the sclera 32. Additionally, in some examples, a gap may be formed between a portion of the scleral landing zone 232 outward from the contact portion 232a and the sclera 32. In this case, if the scleral lens 1 slides on the eyeball 30, friction of the edge of the scleral lens 1 against the eyeball 30 can be reduced, and safety of wearing the scleral lens 1 can be improved.

In some examples, scleral landing zone 232 may include an edge lift. Additionally, the temple may not be in contact with the sclera 32. In other words, the temple may form an angle with the sclera 32. This can prevent the edge of the scleral mirror 1 from being embedded in the scleral edge. In other examples, the temple may be the portion of scleral landing zone 232 outward of contact 232 a. In other words, the edge warping portion may be provided at the outer circumference of the contact portion 232 a.

In some examples, the gap between the portion of the scleral landing zone 232 outward from the contact portion 232a and the sclera 32 may gradually increase. In other words, the gap between the temple and the sclera 32 may gradually increase.

In some examples, the scleral landing zone 232 can form an outwardly open rake with the sclera 32 due to the gradually increasing gap between the portion of the scleral landing zone 232 outward from the contact portion 232a and the sclera 32. Therefore, when the scleral lens 1 slides, the friction of the edge of the scleral lens 1 against the eyeball 30 can be reduced. In addition, too high a tilt angle may reduce the wearing comfort of the scleral lens 1, while too low a tilt angle may easily adhere to the sclera 32.

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 transition zone 22 may extend to the limbus. Additionally, in some examples, the landing zone 23 may include only the scleral landing zone 232. That is, the inner surface 20 may include a central zone 21, a transition zone 22, and a scleral landing zone 232. In other examples, the gap between the transition zone 22 and the cornea 31 may gradually decrease from the edge of the central zone 21 to the intersection of the transition zone 22 and the scleral landing zone 232.

In some examples, the landing zone 23 may include only the scleral landing zone 232, and the scleral landing zone 232 may be in contact with the limbus to form the contact 232 a. Thereby, the angle scleral mirror 1 can be formed. In other examples, the scleral landing zone 232 may tangentially contact the limbus.

In some examples, the landing zone 23 may be connected with the outer surface 10. In other examples, the inner surface 20 and the outer surface 10 may be connected by an edge arc region. This enables the formation of the integrated 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 zone 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 with the landing zone 23. Additionally, in some examples, the peripheral regions 12 may be connected with side arc regions.

In some examples, central zone 21 and its respective outer surface may be formed as a first lens region, transition zone 22 and its respective outer surface as a second lens region, limbal land zone 231 and its respective outer surface as a third lens region, and scleral land zone 232 and its respective outer surface as a fourth lens region. In addition, the first lens area, the second lens area, the third lens area and the fourth lens area may be 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 thicknesses of the first lens region, the second lens region, the third lens region, and the fourth lens region may be different. In other examples, the thickness of the second lens region and the third lens region may be greater than the thickness of the first lens region.

In some examples, the thickness of the scleral lens 1 may gradually increase 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, supporting the scleral lens across the cornea can be facilitated.

Additionally, in some examples, the thickness of the fourth lens region may taper. That is, the thickness of the fourth lens region may taper from the junction of the third lens region and the fourth lens region to the outer edge of the fourth lens region.

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 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 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 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 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 is 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 the fitting method of the scleral lens 1 according to the present embodiment, the scleral lens 1 includes: an outer surface 10 having a convex shape; and an inner surface 20 which is concave and has a central zone 21 for correcting vision, a transition zone 22 which is provided at the outer periphery of the central zone 21 and is annular, a landing zone 23 which is provided at the outer periphery of the transition zone 22 and is annular, the landing zone 23 having a contact portion 232a for contacting with the sclera, and the landing zone 23 including a limbus landing zone 231 which does not contact the cornea and a scleral landing zone 232 which contacts the sclera through the contact portion 232a, the fitting method comprising: determining the diameter of the scleral mirror 1 (step S10); measuring the sagittal depth of the anterior segment consisting of the cornea and the sclera near the cornea, the sagittal depth being the perpendicular distance from the cornea to the sclera diameter, the sclera diameter being equal to the diameter of the scleral lens (step S20); obtaining a rise of the scleral mirror based on the sagittal adjustment, wherein the rise of the contact portion decreases linearly from the inside to the outside (step S30); and prepares the scleral mirror 1 based on the rise of the scleral mirror 1 (step S40).

In this embodiment, obtain the rise parameter of scleral mirror 1 according to the vector of cornea is dark, recycle the rise parameter preparation scleral mirror 1 that obtains, can help scleral mirror 1 and the eyeball of preparation to can help carrying out the fitting of scleral mirror 1 to irregular cornea, also can solve the inaccurate scheduling problem of camber that the corneal injury leads to a certain extent.

In step S10, the scleral lens 1 diameter may be selected according to the diameter size of the cornea. In addition, in some examples, the diameter of the scleral mirror 1 may preferably be larger than the diameter of the cornea for the purpose of not contacting the scleral mirror 1 with the cornea.

In some examples, in step S20, the sagittal depth of the anterior ocular segment may be measured. Additionally, in some examples, the sagittal depth may be the perpendicular distance from the cornea to the sclera diameter, and the sclera diameter may be equal to the diameter of the scleral lens. In the present disclosure, scleral diameter may refer to the transverse diameter of scleral outer surface 10.

In some examples, in step S20, the anterior segment may be composed of the cornea and the sclera proximate to the cornea. Additionally, in some examples, the vector depth may be obtained using optical coherence tomography techniques. That is, the sagittal depth of the anterior ocular segment can be measured by optical coherence tomography. In other examples, the sagittal depth of the anterior ocular segment may refer to the sagittal depth of the outer surface of the anterior ocular segment.

In some examples, in step S20, the measurement range of the optical coherence tomography may be the same size as the diameter of the scleral mirror 1. In other words, the optical coherence tomography can be measured to a sclera diameter equal to the sclera diameter of the sclera mirror 1.

In some examples, in step S20, the angle of the limbus and the angle of the sclera may be obtained by optical coherence tomography. This enables the scleral mirror 1 to be better fitted to the shape of the eyeball (for example, the shape of the sclera), and thus can contribute to fitting the scleral mirror 1 to the eyeball. In the present disclosure, the angle of the limbus may refer to the angle of the limbus formed with the diameter of the cornea, and the angle of the sclera may refer to the angle of the sclera formed with the diameter of the sclera.

In some examples, an image of the anterior segment cross-section in a single direction, i.e., an optical coherence tomography image, is scanned by optical coherence tomography.

In some examples, in step S20, a single horizontal meridian direction optical coherence tomography scan may be performed on the eyeball.

In other examples, in step S20, the eyeball may be subjected to a plurality of horizontal meridian direction optical coherence tomography scans. For example, the eye may be subjected to optical coherence tomography in the horizontal and vertical meridian directions, respectively. This can contribute to the non-rotationally symmetrical design of the scleral mirror 1.

In some examples, in step S20, the optical coherence tomography of the eyeball in multiple horizontal meridian directions may obtain parameters of the cornea and sclera in different quadrants. For example, by performing optical coherence tomography in the horizontal meridian direction on the eyeball, parameters of the cornea and sclera on the nasal side and the temporal side can be obtained; parameters of the cornea and sclera on the upper side and the lower side can be obtained by optical coherence tomography scanning of the eyeball respectively perpendicular to the meridian direction.

In some examples, an optical coherence tomography scan of the eye in a certain meridian direction may obtain the vector depths of points on the anterior surface of the eyeball (including the anterior corneal surface and the anterior scleral surface) in the meridian direction. In addition, in some examples, the optical coherence tomography of the eye in a certain meridian direction may obtain the corneal and scleral vector depths in the meridian direction.

In some examples, the corneal sagittal depth may be the sagittal depth of each point on the cornea. Additionally, in some examples, the sagittal corneal depth may include the total sagittal depth from the corneal apex to the scleral diameter. In other words, the total sagittal depth is the maximum sagittal depth of the corneal to scleral diameter.

In some examples, in step S30, the sagittal height of the obtained scleral mirror 1 may be adjusted on the basis of the sagittal depth obtained in step S20. In other words, in some examples, the sagittal height at which the inner surface 20 is obtained may be adjusted on the basis of the sagittal depth obtained at step S20. That is, the rise of the scleral mirror 1 may include the rise of the inner surface 20.

In some examples, the rise of the scleral mirror 1 may comprise the overall rise of the center of the scleral mirror 1 to the diameter of the scleral mirror 1. In other words, in some examples, the rise of the inner surface 20 may include an overall rise from the center of the inner surface 20 to the diameter of the scleral mirror 1. That is, the overall rise may be the perpendicular distance from the center of the inner surface 20 to the diameter of the scleral mirror 1.

In some examples, the overall sagittal height may be greater than the total sagittal depth. Thus, the scleral lens 1 can have a gap with the cornea. Additionally, in some examples, the difference between the overall sagittal height and the overall sagittal depth may be 350 μm to 400 μm. In this case, the fitted scleral lens 1 can be kept out of contact with the cornea, and the cornea can be protected.

In some examples, optionally, the sagittal height of the central zone 21, the transition zone 22, the limbal land zone 231, and the scleral land zone 232 is derived based on the overall sagittal height of the scleral mirror 1. Thereby, it is possible to advantageously obtain the parameters of the scleral lens 1 matching the eyeball.

In other examples, the sagittal heights of the central zone 21, the transition zone 22, the limbal land zone 231, and the scleral land zone 232 may be obtained from sagittal height adjustments of the central corneal zone, the peripheral corneal zone, the limbus, and the sclera, respectively.

In some examples, the rise of the contact portion may decrease linearly from the inside to the outside. Additionally, in some examples, the sagittal height of the scleral landing zone 232 may be equal to the sagittal depth of the eyeball at the contact portion 232 a. Thereby, the contact portion 232a can be in contact with the sclera.

In some examples, the optical power of the central zone 21 may be adjusted by the rise of the outer surface 10 and the inner surface 20. Therefore, the vision correction device can meet the requirements of various vision correction effects.

In some examples, optionally, the rise of the transition zone 22 decreases linearly from the edge of the central zone 21 to the intersection of the transition zone 22 and the limbal land zone 231. In this case, the tear space can be advantageously reduced.

In some examples, optionally, the rise of the central region 21 gradually decreases and the decreasing magnitude increases from the center of the central region 21 to the edge of the central region 21. This can contribute to the concave inner surface 20.

In some examples, the sagittal height of the scleral mirror 1 may include the sagittal height of the outer surface 10. Additionally, in some examples, the sagittal height of the outer surface 10 may be obtained from a sagittal height adjustment of the inner surface. Thereby, the scleral mirror 1 having a certain thickness can be obtained.

In some examples, in step S40, the scleral mirror 1 may be prepared using the rise of the scleral mirror 1 as a preparation parameter. In other words, the scleral mirror 1 may be prepared according to the rise of the outer surface 10 and the rise of the inner surface 20 as preparation parameters.

According to the present disclosure, it is possible to provide a scleral lens 1 that can be well matched with the sclera 32 and can uniformly disperse the pressure applied to the sclera 32, and a lens fitting method thereof.

While the present disclosure has been described in detail above with reference to the drawings and the embodiments, it should be understood that the above description does not limit the present disclosure in any way. Those skilled in the art can make modifications and variations to the present disclosure as needed without departing from the true spirit and scope of the disclosure, which fall within the scope of the disclosure.

Claims

1. A lens for contact with the sclera,

comprising a convex outer surface and a concave inner surface, the inner surface having a central zone for correcting vision, a transition zone disposed at the periphery of the central zone, a landing zone disposed at the periphery of the transition zone, the landing zone having a contact portion for contacting with the sclera, wherein the inner surface is designed to have a continuous curved surface of a predetermined shape based on a sagittal height, the sagittal height being obtained based on a sagittal depth of the eyeball, the sagittal height of the inner surface gradually decreasing from the center of the central zone to the contact portion, the sagittal height of the inner surface at the central zone being greater than the sagittal depth of the eyeball, the sagittal height of the inner surface at the contact portion being equal to the sagittal depth of the eyeball, the landing zone comprising a limbal landing zone not contacting the cornea and a scleral landing zone contacting the sclera through the contact portion, and the sagittal height of the contact portion linearly decreasing from the inside to the outside.

2. The lens of claim 1, wherein:

the rise of the central region gradually decreases from the center of the central region to the edge of the central region and the decreasing magnitude increases.

3. The lens of claim 1, wherein:

the transition zone has a rise that decreases progressively and with increasing magnitude from the central zone edge to the intersection of the transition zone and the limbal land zone.

4. The lens of claim 1, wherein:

the limbal land region has a sagittal height that decreases progressively and decreases by an decreasing magnitude from the interface of the transition zone and the limbal land region to the interface of the limbal land region and the scleral land region.

5. The lens of claim 1, wherein:

in the scleral landing zone, a rise from an intersection of the scleral landing zone and the limbal landing zone to the contact and a rise of the contact decrease linearly at a first rate, a rise of a portion of the scleral landing zone outward from the contact decreases linearly at a second rate, and the first rate is greater than the second rate.

6. The lens of claim 1, wherein:

at the scleral landing zone, a portion of the inner surface inward from the contact portion has a sagittal height greater than a sagittal depth of an eyeball, and a portion of the inner surface outward from the contact portion has a sagittal height greater than a sagittal depth of an eyeball.

7. The lens of claim 1 or 6, wherein:

the scleral landing zone includes an edge fin that forms a fin with the sclera.

8. The lens of claim 7, wherein:

the clearance between the edge portion and the sclera is gradually increased.

9. The lens of claim 1, wherein:

at the transition zone, the sagittal height of the inner surface is greater than the sagittal depth of the eyeball, and at the limbal landing zone, the sagittal height of the inner surface is greater than the sagittal depth of the eyeball.

10. The lens of claim 1, wherein:

the central zone, the transition zone, and the landing zone are non-rotationally symmetric, and the non-rotational symmetry is designed based on the morphology of the eyeball.

11. The lens of claim 1, wherein:

the central portion of the lens, including the central zone, is comprised of a hard material and the peripheral portion of the lens, including the blend zone and the land zone, is comprised of a soft material.

12. The lens of claim 1, wherein:

the lens is made of a hard high oxygen permeable material, and the hard high oxygen permeable material is selected from at least one of siloxane methacrylate, fluorosilicone methacrylate, perfluoroether and fluorinated siloxane.

13. The lens of claim 1, wherein:

the outer surface is designed parallel to the inner surface.

14. The lens of claim 1, wherein:

forming the central zone and its respective outer surface as a first lens area, the transition zone and its respective outer surface as a second lens area, the limbal land zone and its respective outer surface as a third lens area, the scleral land zone and its respective outer surface as a fourth lens area, and the first, second, third, and fourth lens areas are joined in series to form the lens, the thickness of the lens gradually increasing from the first lens area to the third lens area, and the thickness of the fourth lens area gradually decreasing from the junction of the third and fourth lens areas to the outer edge of the fourth lens area.

15. The lens of claim 14, wherein:

the thickness of the first lens area is 0.01mm to 0.1mm, the thickness of the second lens area is 0.05mm to 0.2mm, the thickness of the third lens area is 0.15mm to 0.3mm, and the thickness of the fourth lens area is 0.01mm to 0.3 mm.