Sclera lens for relieving near fatigue

Abstract

The utility model discloses a near fatigue relieving sclera lens which comprises a sclera lens body, the periphery of the sclera lens body is attached to the outer side of a sclera, and a tear storage space is formed between the sclera lens body and a cornea. According to the sclera lens, the tear storage space is formed between the sclera lens body and the cornea, the tear can be stored in the tear storage space to form a tear layer, the cornea is continuously wetted, the continuous water bath effect is achieved, the problems of dry eyes, astringent eyes and fatigue of a user are solved, and therefore pain caused by dry eyes is relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of rigid contact lenses, in particular to a scleral lens for relieving near vision fatigue. Background Technique

[0002] A scleral lens is a special-designed large-diameter rigid gas-permeable contact lens. In a broad sense, scleral lenses include corneal-scleral lenses and full-scleral lenses. The former means that part of the lens landing area is on the cornea and part is on the sclera; the latter means that the lens landing area is completely located on the anterior surface of the sclera. Common indications include: diseases causing corneal irregular astigmatism, severe dry eye, corneal degeneration or dystrophy, corneal trauma, etc.

[0003] A scleral lens is disclosed in Chinese Patent Publication No. CN219997430U. The scleral lens has a posterior surface that contacts the scleral region of the eyeball. The scleral lens includes a central optical zone, a pre-corneal marginal zone, a corneal marginal zone, and a landing zone arranged in sequence from the center to the periphery. A channel is arranged on the posterior surface of the scleral lens. The starting point of the channel is located between the junction of the corneal marginal zone and the landing zone and the middle position of the landing zone, and the end of the channel extends radially to the edge of the scleral lens. By designing the scleral lens into four zones, the shape and depth of a single zone can be independently adjusted, which is beneficial to adapting to different types of eyeball surface morphologies; by arranging a channel on the posterior surface of the scleral lens, while realizing tear exchange, the wearing comfort is ensured.

[0004] Scleral lenses have broad application prospects and show great potential in improving the visual quality and life of patients with various eye diseases. Existing scleral lenses still have some disadvantages in practical applications. For example, with the increase of age, presbyopia occurs. In this case, for those with reduced accommodation ability, when using a single-focus scleral lens, the vision is clear when looking at a distance, but when looking at near, the vision is blurred because the image is formed in front of the retina, resulting in near vision fatigue. Content of the Utility Model

[0005] The utility model provides a scleral lens for relieving near vision fatigue to solve the problems raised in the background technique.

[0006] To achieve the above purposes, the utility model is realized through the following technical solutions:

[0007] A scleral lens for relieving near vision fatigue includes a scleral lens body. The outer periphery of the scleral lens body fits against the outside of the sclera, and a tear storage space is formed between the scleral lens body and the cornea.

[0008] Preferably, the scleral lens body includes a landing zone, a transition zone, and a base curve zone. The base curve zone, the transition zone, and the landing zone are concentrically arranged in sequence from the center to the edge of the posterior surface of the scleral lens body. An optical zone concentric with the lens is provided at the center of the anterior surface of the scleral lens body;

[0009] The central thickness of the scleral lens body is 0.2 mm to 2.2 mm.

[0010] Preferably, the base curve region has a spherically rotationally symmetric structure;

[0011] The diameter of the base curve region is 5.00 mm to 13.00 mm, and the sagittal height of the base curve region is 0.29 mm to 2.11 mm.

[0012] Preferably, the transition region is located above the corneal and scleral limbus regions and has a rotationally symmetric aspherical design;

[0013] The diameter of the transition region is 12.00 mm to 14.00 mm, and the sagittal height of the transition region is 1.21 mm to 4.71 mm.

[0014] Preferably, the landing region has a spherically rotationally symmetric structure, the landing region conforms to the shape of the sclera in the contact area, and the landing region contacts the sclera;

[0015] The diameter of the landing region is 14.00 mm to 17.00 mm, and the sagittal height of the landing region is 0.90 mm to 4.98 mm.

[0016] Preferably, a tear layer is formed between the transition region, the base curve region and the cornea, and the tear layer is located in the tear storage space;

[0017] The thickness range of the formed tear layer is 100 μm to 300 μm.

[0018] Preferably, the optical region spans the upper region of the cornea. The optical region includes a first optical region and a second optical region. The first optical region is a circular region centered on a central optical axis of the continuously zoomable scleral lens body and surrounded by a radius of 1.5 ± 1.0 mm;

[0019] The second optical region extends radially outward from the periphery of the first optical region.

[0020] Preferably, the dioptric power of the optical region continuously changes radially outward from the central optical axis. The first optical region has a gradient change of 0.25 D / mm or less, and the second optical region has a gradient change of 0.25 D / mm or more.

[0021] Preferably, the dioptric power of the second optical region increases positively radially outward, and the difference between the dioptric power at the periphery of the second optical region and the dioptric power at the central optical axis is ≤ 4.00 D.

[0022] Preferably, the dioptric power increment rate of the first optical region is lower than that of the second optical region.

[0023] Compared with the prior art, the utility model has at least the following beneficial effects:

[0024] The tear layer of the scleral contact lens can bring a continuous water bath effect to dry eye patients, thereby alleviating the pain caused by dry eye. Moreover, it solves the problems of imaging jump or light splitting phenomenon of existing multifocal contact lenses, which causes adverse reactions such as dizziness or maladaptation in wearers, and at the same time corrects the focal position of the image formed in the peripheral retina, realizes the transition from far vision to near vision, and can provide clear vision from far to near for presbyopic or cataract postoperative patients, and alleviate visual fatigue when looking at near objects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the main structure of the utility model;

[0026] Figure 2 is a schematic diagram of the rear surface structure of the scleral lens body of the utility model;

[0027] Figure 3 is a schematic diagram of the front surface structure of the scleral lens body of the utility model.

[0028] In the figure: 1, scleral lens body; 2, tear storage space; 3, cornea; 4, sclera; 111, landing area; 112, transition area; 113, base curve area; 121, first optical area; 122, second optical area. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In the present utility model, descriptions such as "first" and "second" are only for descriptive purposes, and do not specifically refer to the order or sequence. Nor are they used to limit the present utility model. They are merely used to distinguish protection components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions and technical features between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0030] Embodiment 1

[0031] Please refer to Figure 1 , a scleral lens for relieving near fatigue, including a scleral lens body 1, the outer periphery of the scleral lens body 1 is attached to the outside of the sclera 4, and a tear storage space 2 is formed between the scleral lens body 1 and the cornea 3.

[0032] The working principle and beneficial effects of the above solution:

[0033] This application forms a tear storage space 2 between the scleral lens body 1 and the cornea 3. Tears can be stored in the tear storage space 2 to form a tear layer, which continuously infiltrates the cornea 3, bringing a continuous water bath effect, solving the problems of dryness, astringency, and fatigue in the user's eyes, and thus alleviating the pain caused by dry eye.

[0034] Embodiment 2

[0035] Please refer to Figures 1 - 3 , on the basis of Embodiment 1, the scleral lens body 1 includes a landing zone 111, a transition zone 112, and a base curve zone 113. The base curve zone 113, the transition zone 112, and the landing zone 111 are concentrically arranged in sequence from the center to the edge of the rear surface of the scleral lens body 1. An optical zone concentric with the lens is provided at the center of the front surface of the scleral lens body 1;

[0036] The central thickness of the scleral lens body 1 is 0.2 mm to 2.2 mm.

[0037] The base curve zone 113 is a spherically rotationally symmetric structure;

[0038] The diameter of the base curve zone 113 is 5.00 mm to 13.00 mm, and the sagittal height of the base curve zone 113 is 0.29 mm to 2.11 mm.

[0039] The transition zone 112 is located above the corneal-scleral limbus area of the cornea 3 and is a rotationally symmetric aspherical design;

[0040] The diameter of the transition zone 112 is 12.00 mm to 14.00 mm, and the sagittal height of the transition zone 112 is 1.21 mm to 4.71 mm.

[0041] The landing zone 111 is a spherically rotationally symmetric structure, conforming to the shape of the sclera 4 in the contact area, and the landing zone 111 is in contact with the sclera 4;

[0042] The landing zone 111 can provide uniform support force for the scleral lens body 1 and ensure that a tear layer will be formed between the base curve zone 113, the transition zone 112, the cornea 3 and the scleral lens body 1;

[0043] The diameter of the landing zone 111 is 14.00 mm to 17.00 mm, and the sagittal height of the landing zone 111 is 0.90 mm to 4.98 mm.

[0044] A tear layer is formed between the transition zone 112, the base curve zone 113 and the cornea 3, and the tear layer is located in the tear storage space 2;

[0045] The thickness range of the formed tear layer is 100 μm to 300 μm.

[0046] The optical zone spans the upper region of the cornea 3. The optical zone includes a first optical zone 121 and a second optical zone 122. The first optical zone 121 is a circular area centered on the central optical axis of the continuous zoom scleral lens body 1 with a radius of 1.5 ± 1.0 mm, so as to meet the requirement of clear vision from far to near.

[0047] The second optical zone 122 extends radially outward from the periphery of the first optical zone 121.

[0048] The refractive power of the optical zone continuously changes radially outward starting from the central optical axis. The first optical zone 121 has a gradient change of 0.25 D / mm or less, and the second optical zone 122 has a gradient change of more than 0.25 D / mm.

[0049] The refractive power of the first optical zone 121 is the on-eye refraction degree when the patient wears the scleral lens, which is used for seeing far. The second optical zone 122 increases the positive degree on the basis of the first optical zone 121 to experiment with seeing near. The specific increased degree is determined by the optometrist's prescription.

[0050] The refractive power of the second optical zone 122 increases radially outward with a positive value, and the difference between the refractive power at the periphery of the second optical zone 122 and the refractive power at the central optical axis is ≤ 4.00 D.

[0051] The rate of increase in the refractive power of the first optical zone 121 is lower than that of the second optical zone 122.

[0052] The working principle and beneficial effects of the above solution:

[0053] It solves the problems of imaging jump or light splitting in existing multifocal contact lenses, which cause adverse reactions such as dizziness or poor adaptation in wearers. At the same time, it corrects the focal position of the image formed in the peripheral retina of the retina, realizes the transition from seeing far to seeing near, can provide clear vision from far to near for presbyopic or cataract surgery patients, and relieve visual fatigue when seeing near.

[0054] Example 3

[0055] Please refer to Figures 1 - 3, on the basis of Embodiments 1-2, the scleral lens body 1 suitable for presbyopic patients, the first optical zone 121 and the second optical zone 122 are defined by taking the central optical axis L as the center and surrounded by radii of 1.0 mm and 3.0 mm respectively. The starting refractive power of the first optical zone 121 is zero, the average change rate of the refractive power of the first optical zone 121 along the radial direction outward is +0.25 D / mm, the average change rate of the refractive power of the second optical zone 122 along the radial direction outward is +1.00 D / mm, and the refractive power at the edge of the second optical zone 122 to a radius of 3 mm is +4.00 D.

[0056] Working principle and beneficial effects of the above solution:

[0057] Through the aspherical and continuous zoom design of the first optical zone 121 and the second optical zone 122, the scleral lens for relieving near fatigue can avoid the blurred image phenomenon caused by the jumping image or light splitting phenomenon caused by the discontinuous step sharp change of the existing multifocal contact lenses. Moreover, the first optical zone 121 can be used by the wearer to view distant scenes, while the second optical zone 122 can be used to view near scenes, and can be used by the scleral lens population with presbyopia.

[0058] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A scleral lens for relieving near fatigue, characterized in that: It comprises a scleral lens body (1), the outer periphery of the scleral lens body (1) is attached to the outer side of the sclera (4), and a tear storage space (2) is formed between the scleral lens body (1) and the cornea (3); The scleral lens body (1) comprises a landing zone (111), a transition zone (112), and a base curve zone (113); the base curve zone (113), the transition zone (112), and the landing zone (111) are arranged concentrically from the center to the edge of the rear surface of the scleral lens body (1); and an optical zone concentric with the lens is arranged at the center of the front surface of the scleral lens body (1); The central thickness of the scleral lens body (1) is 0.2 mm to 2.2 mm; The optical zone is located in the area above the cornea (3), and includes a first optical zone (121) and a second optical zone (122). The first optical zone (121) is a circular area with a central optical axis of the continuously variable focus scleral lens body (1) as the center and a radius of 1.5±1.0 mm. The second optical zone (122) extends outwardly from the periphery of the first optical zone (121) in a radial direction; The dioptric power of the optical zone changes continuously outward in the radial direction starting from the central optical axis, with the first optical zone (121) having a gradient change of less than 0.25 D / mm, and the second optical zone (122) having a gradient change of more than 0.25 D / mm; The dioptric power of the second optical zone (122) increases with a positive value radially outward, and the difference between the dioptric power at the periphery of the second optical zone (122) and the dioptric power at the central optical axis is ≤4.00D; The dioptric power gradual increase rate of the first optical zone (121) is lower than the dioptric power gradual increase rate of the second optical zone (122).

2. The near fatigue relieving scleral lens according to claim 1, characterized in that: The base arc region (113) is a spherical structure and is rotationally symmetrical; The diameter of the base arc region (113) is 5.00 mm to 13.00 mm, and the sagittal height of the base arc region (113) is 0.29 mm to 2.11 mm.

3. The near fatigue relieving scleral lens according to claim 1, characterized in that: The transition zone (112) is located above the limbus of the cornea (3) and the sclera (4) and is designed as a rotationally symmetric aspherical surface; The diameter of the transition zone (112) is 12.00 mm to 14.00 mm, and the arrow height of the transition zone (112) is 1.21 mm to 4.71 mm.

4. The near fatigue relieving scleral lens according to claim 1, characterized in that: The landing area (111) is a spherical rotationally symmetrical structure, the landing area (111) fits the shape of the sclera (4) in the contact area, and the landing area (111) is in contact with the sclera (4); The diameter of the landing area (111) is 14.00 mm to 17.00 mm, and the height of the landing area (111) is 0.90 mm to 4.98 mm.

5. The near fatigue relieving scleral lens according to claim 1, characterized in that: A tear layer is formed between the transition zone (112), the base curve zone (113) and the cornea (3), and the tear layer is located in the tear storage space (2); The tear layer is formed with a thickness ranging from 100 μm to 300 μm.

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