Bifocal sclera lens structure and sclera lens thereof

Abstract

The utility model relates to the technical field of ophthalmic optics, in particular to a bifocal sclera lens structure and a sclera lens thereof, which comprise a central optical area, a transition area and a landing area. The landing area comprises a first contact part integrally connected with the transition area and a second contact part integrally formed with the first contact part. The first contact portion has an outer wall and an inner wall. The second contact part protrudes outwards relative to the outer surface where the first contact part is located to form a protruding outer wall, the outer surface of the protruding outer wall is in a circular arc shape, and the free-form curvatures of the protruding outer wall and the outer surface of the first contact part are different. By arranging the protruding outer wall which is not the same as the first contact part in free-form curvature, a certain angle is formed between the protruding outer wall and the first contact part, so that the second contact part is in better contact with the sclera, meanwhile, the whole sclera lens has good stability, the supporting effect of the landing area is good, and the stability of the whole sclera lens structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ophthalmic optics, in particular to a bifocal scleral lens structure and a scleral lens thereof. Background Art

[0002] Contact lenses, also known as contact lenses or contact glasses, are lenses worn on the cornea to correct vision or protect the eyes. They offer significant improvements in appearance and convenience for patients with refractive errors such as myopia, hyperopia, and astigmatism. They also offer a wider field of vision and more vivid vision. They are also effective in controlling the progression of myopia and astigmatism in adolescents and treating specific eye diseases.

[0003] As the name implies, corneal contact lenses are lenses that directly contact the cornea. Since the cornea contains abundant sensory nerve cells and is a relatively sensitive part of the human body, wearing contact lenses directly on the cornea can easily cause a foreign body sensation or other symptoms of discomfort, and these symptoms are more serious for patients with corneal diseases (such as keratoconus, dry eyes, etc.). In addition, for patients with irregular corneal refractive errors, it is difficult to obtain clear and comfortable corrected vision through ordinary hard or soft contact lenses. Therefore, a scleral lens that does not contact the cornea but lands on the scleral area outside the cornea is proposed. Specifically, by increasing the diameter of the eyeglass lens so that the lens is larger than the entire cornea, the contact points of all lenses with the eye surface are changed from the cornea to the less sensitive sclera, so as to reduce the risk of damage to the pathological cornea and reduce the presence of foreign body sensation. In particular, for some patients with damaged corneal tissue, scleral lenses can form ample tear space between the side of the lens close to the cornea and the cornea. This tear space can be filled with tears to form a tear film that can protect the cornea and accelerate the healing of the corneal epithelium.

[0004] However, the main problem with the current common scleral lenses is that they have a small landing area and are prone to prolapse. Utility Model Content

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a bifocal scleral lens structure and a scleral lens thereof, which solves the technical problem of the prior art that the landing area is small and easy to prolapse.

[0006] In order to achieve the above-mentioned purpose, the main technical solutions adopted by this utility model include:

[0007] In one aspect, an embodiment of the present invention provides a bifocal scleral lens structure, comprising a central optical zone, an annular transition zone disposed on the periphery of the central optical zone, and an annular landing zone disposed on the periphery of the transition zone, the inner surface of which contacts the sclera, wherein the landing zone has a discontinuous free curvature;

[0008] The landing area includes a first contact portion integrally connected to the transition area and a second contact portion integrally formed with the first contact portion;

[0009] The first contact portion has an outer wall and an inner wall having the same free curvature as the outer surface and the inner surface of the transition zone;

[0010] The second contact portion protrudes outward relative to the outer surface of the first contact portion to form a protruding outer wall. The outer surface of the protruding outer wall is arc-shaped, and the free curvature of the protruding outer wall and the outer surface of the first contact portion are different.

[0011] Optionally, the protruding outer wall is arranged at a bending angle relative to an outer surface of the first contact portion, and the bending angle ranges from 120° to 135°.

[0012] Optionally, a plurality of air holes are provided at intervals in the circumferential direction of the first contact portion.

[0013] Optionally, the diameter of the pores is 0.2-1.0 mm.

[0014] Optionally, the air hole is close to the second contact portion.

[0015] Optionally, the central optical zone has a near vision zone and a far vision zone, the near vision zone has a first focus and a first optical center, the light passing through the first optical center forms a virtual image on the focal plane of the first focus, and the far vision zone has a second focus and a second optical center, the light passing through the second optical center forms a virtual image on the focal plane of the second focus.

[0016] On the other hand, a scleral lens comprises two scleral lens structures as described above.

[0017] The beneficial effects of the present invention are as follows: the bifocal scleral lens structure of the present invention, by providing a protruding outer wall having a different free curvature from the first contact portion, forms a certain angle with the protruding outer wall and the first contact portion, thereby enabling the second contact portion to better contact the sclera. This also provides good stability to the entire scleral lens, thereby providing a good support effect for the landing zone and improving the stability of the entire scleral lens structure. This ensures a more stable position of the central optical zone relative to the cornea, thereby preventing the scleral lens from moving, ensuring the use of bifocal scleral lenses, and resolving the technical problem of existing small landing zones that are prone to prolapse. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure of the bifocal scleral lens structure of the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of the details of the circled "A";

[0020] Figure 3 for Figure 1 Schematic diagram of the top view structure.

[0021] Description of Reference Numerals

[0022] 1: central optical zone; 2: transition zone; 3: landing zone; 31: connecting part; 32: contact part; 33: air hole. DETAILED DESCRIPTION

[0023] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0024] See also Figure 1-Figure 3 As shown, a scleral lens includes two scleral lens structures. The embodiment of the utility model provides a bifocal scleral lens structure, including a central optical zone 1, an annular transition zone 2 arranged on the periphery of the central optical zone 1, and an annular landing zone 3 arranged on the periphery of the transition zone 2 and having an inner surface in contact with the sclera, and the landing zone 3 has a discontinuous free curvature;

[0025] In this embodiment, the landing zone 3 includes a first contact portion 31 integrally connected to the transition zone 2, and a second contact portion 32 integrally formed with the first contact portion. The first contact portion 31 has an outer wall and an inner wall with the same free curvature as the outer and inner surfaces of the transition zone. The second contact portion 32 protrudes outward from the outer surface of the first contact portion 31 to form a protruding outer wall. The outer surface of the protruding outer wall is arc-shaped, and the free curvature of the protruding outer wall is different from that of the outer surface of the first contact portion 31.

[0026] In this embodiment, a bifocal scleral lens structure is provided with a protruding outer wall having a different free curvature than the first contact portion 31, so that the protruding outer wall and the first contact portion 31 form a certain angle, thereby allowing the second contact portion 32 to better contact the sclera. This also provides good stability for the entire scleral lens, thereby enhancing the support effect of the landing zone and improving the stability of the entire scleral lens structure. This ensures a more stable position of the central optical zone relative to the cornea, thereby preventing movement of the scleral lens, ensuring the use of bifocal scleral lenses, and resolving the technical problem of existing small landing zones that are prone to prolapse.

[0027] Furthermore, the protruding outer wall is bent at an angle of 120°-135° relative to the outer surface of the first contact portion 31. This angle ensures support while preventing eye wear. It also prevents the sensation of a foreign body when blinking, making it more comfortable to wear.

[0028] Furthermore, the first contact portion 31 is provided with a plurality of air holes 33 spaced circumferentially. The provision of these air holes 33 prevents tears from being trapped in the tear space, which can lead to turbidity of the tear space after prolonged wear, resulting in poor visual quality. Therefore, the air holes 33 provide sufficient oxygen to the cornea, promote the excretion of bubbles and metabolites under the lens, and significantly enhance wearer comfort. Furthermore, these air holes 33 provide a certain cushioning effect when wearing scleral lenses. Since scleral lenses are made of a hard material, the cushioning air holes 33 help to neutralize deformation.

[0029] Furthermore, the diameter of the air hole 33 is 0.2-1.0 mm and the air hole 33 is close to the second contact portion 32 .

[0030] Furthermore, the central optical zone 1 has a near vision zone and a far vision zone. The near vision zone has a first focal point and a first optical center. Light passing through the first optical center forms a virtual image on the focal plane of the first focal point. The far vision zone has a second focal point and a second optical center. Light passing through the second optical center forms a virtual image on the focal plane of the second focal point. The first optical center and the second optical center are located at a position determined by the pupil distance of the human eye and determine the overall optical center of the contact lens.

[0031] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0032] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, when a first feature is “above” or “below” a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0034] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0035] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A bifocal scleral lens structure, characterized by: The invention comprises a central optical zone (1), a transition zone (2) arranged on the periphery of the central optical zone (1) and in an annular shape, and a landing zone (3) arranged on the periphery of the transition zone (2) and in an annular shape, the inner surface of which contacts the sclera, and the landing zone (3) has a discontinuous free curvature; The landing area (3) comprises a first contact portion (31) integrally connected to the transition area (2) and a second contact portion (32) integrally formed with the first contact portion; The first contact portion (31) has an outer wall and an inner wall with the same free curvature as the outer surface and the inner surface of the transition zone; The second contact portion (32) is protruded outward relative to the outer surface of the first contact portion (31) to form a protruding outer wall. The outer surface of the protruding outer wall is in an arc shape, and the free curvature of the protruding outer wall is different from that of the outer surface of the first contact portion (31).

2. The bifocal scleral lens structure according to claim 1, wherein: The protruding outer wall is arranged at a bending angle relative to the outer surface of the first contact portion (31), and the bending angle range is between 120° and 135°.

3. The bifocal scleral lens structure according to claim 2, wherein: The first contact portion (31) is provided with a plurality of air holes (33) at intervals in the circumferential direction.

4. The bifocal scleral lens structure according to claim 3, wherein: The diameter of the pores (33) is 0.2-1.0 mm.

5. The bifocal scleral lens structure according to claim 3, wherein: The air hole (33) is close to the second contact portion (32).

6. The bifocal scleral lens structure according to claim 4, wherein: The central optical zone (1) has a near vision zone and a far vision zone, the near vision zone has a first focus and a first optical center, and light passing through the first optical center forms a virtual image on the focal plane of the first focus, and the far vision zone has a second focus and a second optical center, and light passing through the second optical center forms a virtual image on the focal plane of the second focus.

7. A scleral lens, characterized in that: The invention comprises two scleral lens structures according to any one of claims 1 to 6.

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