Aspheric progressive multifocal scleral lens and its fitting method

Abstract

The present invention relates to the field of ophthalmic optics, and in particular to an aspheric progressive multifocal scleral lens and a method for fitting the lens, comprising a central optical zone, a transition zone and a landing zone. The landing zone comprises a connecting portion, a contact portion and a supporting portion. The connecting portion and the contact portion are connected by a bending portion, and the contact portion is arranged upward and inward along the direction in which the bending portion extends. One end of the supporting portion is integrally formed with the connecting portion, and the other end is a free end that abuts against the contact portion. The cross-sections of the supporting portion, the connecting portion, the bending portion and the contact portion form a triangular structure. By setting the landing zone as a triangular structure formed by the connecting portion, the bending portion, the contact portion and the supporting portion, and the triangular structure having good stability, the supporting effect of the landing zone is improved, thereby improving the stability of the overall scleral lens structure. This can ensure that the position of the central optical zone relative to the cornea is more stable, thereby preventing the scleral lens from moving, and ensuring the use of the multifocal progressive scleral lens.

Description

Technical Field

[0001] The present invention relates to the technical field of ophthalmic optics, and in particular to an aspherical progressive multifocal scleral lens and a method for fitting the lens. Background Art

[0002] With the increasing use of electronic devices, vision problems such as myopia and astigmatism are becoming more common. Currently, vision correction is generally achieved through the use of glasses or contact lenses. Commonly used hard contact lenses are worn directly on the cornea, placing them in direct contact with the cornea. However, the cornea has many sensory nerve cells, making it more sensitive to contact objects. Patients with eye conditions such as dry eye and keratoconus face the risk of aggravating their foreign body sensation or other discomfort when hard contact lenses are worn directly on the cornea.

[0003] To this end, in order to make the wearer more comfortable for corneal patients, scleral lenses that do not contact the cornea but land on the sclera area outside the corneal margin can be used. Specifically, by increasing the diameter of the contact lens so that the lens is larger than the entire cornea, all the contact points between the lens and 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.

[0004] However, as people age, they may develop presbyopia. In this case, using a single-focus scleral lens allows for clear near vision, but blurred far vision due to the image being formed in front of the retina. Moreover, many patients suffer from myopia due to severe dry eye and keratoconus and other eye diseases. These patients are not suitable for using multifocal frame lenses, and ordinary scleral lenses cannot solve their blurred far vision problem. Since current scleral lenses have only one focus, they need to constantly switch between near and far vision, which can cause eye fatigue. Currently, multifocal lenses only exist on contact lenses. Since the scleral lens and the cornea are supported by tears and the landing area in contact with the sclera, the support effect is poor. Therefore, multifocal scleral lenses are difficult to market due to their poor support. Summary of the Invention

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an aspheric progressive multifocal scleral lens and a method for fitting the same, which solves the technical problem that the existing multifocal lenses are only available on corneal contact lenses. Since the scleral lens and the cornea are supported by tears and the landing area in contact with the sclera, the supporting effect is poor. Therefore, multifocal scleral lenses have poor support, which makes them difficult to be put on the market.

[0006] In order to achieve the above objectives, the main technical solutions adopted by the present invention include:

[0007] In one aspect, an embodiment of the present invention provides an aspheric progressive addition scleral lens comprising a central optical zone, an annular transition zone disposed on the periphery of the central optical zone, and a landing zone disposed on the periphery of the transition zone in an annular shape with an inner surface in contact with the sclera;

[0008] The central optical zone includes a near vision zone located at the lower part, a far vision zone located at the upper part, and a visual buffer zone arranged between the far vision zone and the near vision zone;

[0009] The landing zone includes a connecting portion integrally connected to the transition zone, a contact portion in contact with the sclera, and a supporting portion obliquely arranged between the connecting portion and the contact portion;

[0010] The connecting portion is arranged to be inclined outward and downward along the extension direction of the transition zone, and the connecting portion is connected to the contact portion through a bending portion, the bending portion is arranged at an angle, and the contact portion is arranged upward and inward along the extension direction of the bending portion. One end of the supporting portion is integrally formed with the connecting portion, and the other end is a free end that abuts against the contact portion. The cross-sections of the supporting portion, the connecting portion, the bending portion, and the contact portion form a triangular structure.

[0011] Optionally, the bending angle of the bending portion ranges from 5° to 15°.

[0012] Optionally, the triangular structure is an isosceles triangle.

[0013] Optionally, both the connecting portion and the supporting portion are provided with through holes for ventilation.

[0014] Optionally, the near vision zone is circular with an opening, the near vision zone has a first focus and a first optical center, and the light passing through the first optical center forms a virtual image on the focal plane of the first focus. The far vision zone is the area of ​​the remaining part of the central optical zone, the far vision zone has a second focus and a second optical center, and the light passing through the second optical center forms a virtual image on the focal plane of the second focus.

[0015] Optionally, the opening is the visual buffer zone.

[0016] Optionally, the near vision zone occupies 1 / 4-1 / 3 of the area of ​​the central optical zone, and an astigmatism zone is further provided in the lower part of the central optical zone, and the astigmatism zone is located outside the near vision zone.

[0017] Optionally, the near vision zone is located on a side close to the corner of the eye.

[0018] Optionally, the central thickness of the central optical zone is 0.05 mm to 0.08 mm.

[0019] On the other hand, a method for dispensing glasses is provided, wherein the method can be used to dispense an aspherical progressive multifocal scleral lens;

[0020] S1. Determine the distance vision power and determine the wearer's distance vision equivalent spherical lens through the vertex conversion algorithm;

[0021] S2. Determine the primary / secondary eye;

[0022] S3, confirm the addition of light;

[0023] For early-stage presbyopia (within +1.50D), choose low-addition lenses;

[0024] For severe presbyopia (+1.75D to +2.50D), choose high and low light addition lenses;

[0025] S4. After ten minutes of trial wearing, check the lens fit and position it in the landing zone.

[0026] S5. Perform additional photometric correction under normal indoor lighting.

[0027] The beneficial effects of the present invention are as follows: the aspheric progressive multifocal scleral lens of the present invention, by configuring the landing zone into a triangular structure formed by a connecting portion, a curved portion, a contact portion, and a supporting portion, has good stability, thereby improving the support effect of the landing zone and enhancing the stability of the overall scleral lens structure. This can ensure that the position of the central optical zone relative to the cornea is more stable, thereby preventing the scleral lens from moving, thereby ensuring the use of the progressive multifocal scleral lens, and solving the technical problem that multifocal lenses currently exist only on corneal contact lenses, because the scleral lens and the cornea are supported by tears and the landing zone in contact with the sclera, resulting in poor support effect. Therefore, multifocal scleral lenses have poor support, which makes them difficult to market. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the structure of the aspheric progressive multifocal scleral lens of the present invention;

[0029] Figure 2 A schematic diagram of the cross-sectional structure of the invented aspheric progressive multifocal scleral lens;

[0030] Figure 3 for Figure 1 Schematic diagram of part of the structure of the middle landing area.

[0031] Description of Reference Numerals

[0032] 1: Central optical zone; 11: Near vision zone; 12: Far vision zone; 13: Visual buffer zone; 14: Astigmatism zone; 2: Transition zone; 3: Landing zone; 31: Connecting part; 32: Contact part; 33: Support part; 34: Bending part; 35: Buffer space. DETAILED DESCRIPTION

[0033] 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.

[0034] See also Figure 1-Figure 3 As shown, a scleral lens includes two scleral lens structures. An aspherical progressive multifocal scleral lens provided in an embodiment of the present invention includes a central optical zone 1, an annular transition zone 2 disposed on the periphery of the central optical zone 1, and a landing zone 3 disposed on the periphery of the transition zone 2 in an annular shape, the inner surface of which contacts the sclera.

[0035] In this embodiment, the central optical zone 1 includes a near vision zone 11 at the bottom, a far vision zone 12 at the top, and a visual buffer zone 13 located between the far vision zone 12 and the near vision zone 11. The external progressive optical design provides clear vision from near to far. The optical zone is divided into a far vision zone, an intermediate transition zone, a near vision zone, and a peripheral astigmatism zone, achieving a smooth transition from far to near vision while reducing peripheral astigmatism to an acceptable level for the human eye. This design provides clear vision from near to far for patients with presbyopia or post-cataract surgery. This solution solves the problem of multifocal progressive lenses on rescleral lenses, extending its applicability to a wider range of patients, including those with myopia caused by eye conditions such as severe dry eye and keratoconus.

[0036] In this embodiment, the landing zone 3 includes a connecting portion 31 connected to the transition zone 2, a contact portion 32 that contacts the sclera, and a support portion 33 obliquely disposed between the connecting portion 31 and the contact portion 32. The connecting portion 31 is inclined outward and downward along the extension direction of the transition zone 2. The connecting portion 31 and the contact portion 32 are connected by a bend 34, which is disposed at an angle. The contact portion 32 is disposed upward and inward along the extension direction of the bend 34. One end of the support portion 33 is integrally formed with the connecting portion 31, and the other end is a free end that abuts against the contact portion 32. The cross-section of the support portion 33, the connecting portion 31, the bend 34, and the contact portion 32 forms a triangular structure.

[0037] It should be noted that the other free end of the support portion 33 is an oblique cut structure, so as to better abut against the contact portion 32 to form a buffer space 35 of a triangular structure with a buffer function.

[0038] In this embodiment, an aspheric progressive multifocal scleral lens is constructed by configuring the landing zone 3 into a triangular structure formed by a connecting portion 31, a curved portion 34, a contact portion 32, and a support portion 33. This triangular structure provides excellent stability, thereby enhancing the support effect of the landing zone 3 and improving the stability of the overall scleral lens structure. This ensures a more stable position of the central optical zone 1 relative to the cornea, preventing movement of the scleral lens and ensuring the use of the multifocal scleral lens. This solves the technical problem that multifocal scleral lenses currently exist only in contact lenses, where the scleral lens and the cornea are supported by tear fluid and the landing zone in contact with the sclera, resulting in poor support. Consequently, multifocal scleral lenses are difficult to market due to their poor support.

[0039] Furthermore, the bending angle of the bending portion 34 is in the range of 5°-15°. This angle setting can ensure support while preventing eye wear, and can prevent the foreign body sensation when blinking, making it more comfortable to wear.

[0040] Furthermore, the triangular structure is an isosceles triangle. The spatial structure of the isosceles triangle is more compact and has better support stability, which greatly improves the firmness between the landing area 3 and the sclera.

[0041] Furthermore, both the connecting portion 31 and the supporting portion 33 are provided with through holes 35 for tear flow. The through holes 35 can provide sufficient oxygen to the cornea, promote the discharge of bubbles and metabolites under the lens, and greatly improve the wearer's comfort.

[0042] Furthermore, the near vision zone 11 is circular with an opening and has a first focus and a first optical center. Light passing through the first optical center forms a virtual image on the focal plane of the first focus. The far vision zone 12 is the remaining portion of the central optical zone and has a second focus and a second optical center. Light passing through the second optical center forms a virtual image on the focal plane of the second focus. The first and second optical centers are located at positions determined by the interpupillary distance of the human eye and define the overall optical center of the contact lens.

[0043] Furthermore, the opening is a visual buffer zone 13. The near viewing zone 11 provides small viewing distance imaging, and its gradual transition can obtain a better viewing distance switching experience.

[0044] Furthermore, the near vision zone 11 occupies 1 / 4-1 / 3 of the area of ​​the central optical zone 1. The lower part of the central optical zone 1 is further provided with an astigmatism zone 14, which is located outside the near vision zone 11. By providing the astigmatism zone 14, the needs of different patients can be met, and the adaptability range is wider.

[0045] Furthermore, the near vision zone 11 is located near the corner of the eye, which provides a better visual effect when the patient is looking at near objects, and also increases the area of ​​other functional areas.

[0046] Furthermore, the central thickness of the central optical zone 1 is 0.05mm to 0.08mm. By changing the specific structure of the landing zone 3 to improve the support strength of the scleral lens, the thickness of the entire scleral lens can be designed to be thinner than existing scleral lenses, thereby improving the wearing comfort of the wearer.

[0047] The invention discloses a method for fitting glasses, which can be used to fit an aspherical progressive multifocal scleral lens.

[0048] S1. Determine the distance vision power and determine the wearer's distance vision equivalent spherical lens through the vertex conversion algorithm.

[0049] S2. Determine the dominant / secondary eye. It should be noted that the dominant eye is generally the eye that is used more frequently or determines direction.

[0050] S3. Confirm and add light.

[0051] Specifically, for early-stage presbyopia (within +1.50D), low-addition lenses should be used;

[0052] For severe presbyopia (+1.75D to +2.50D), high and low light addition lenses should be used.

[0053] S4. After ten minutes of trial wearing, check the lens fit and position it using landing zone 3. A good fit includes good center positioning and proper sliding.

[0054] S5. Perform additional photometric correction under normal indoor lighting, such as reading a newspaper, and then checking distance vision outdoors.

[0055] It should be noted that if the wearer is not satisfied, he or she can use trial lenses of frame glasses to improve vision while looking with both eyes at the same time.

[0056] Improve distance vision: add -0.25D to the dominant eye or change the high-low plus on the dominant eye to a low-low plus. Improve near vision: add +0.25D to the accessory eye or change the lens on the accessory eye to a high-low plus.

[0057] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0058] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and 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 the present invention based on specific circumstances.

[0059] 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. Furthermore, 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.

[0060] In the description of this specification, the terms "one embodiment", "some embodiments", "embodiments", "examples", "specific examples" or "some examples" refer to the specific features, structures, materials or characteristics described in conjunction with the embodiment or example and included in at least one embodiment or example of the present invention. 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0061] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An aspheric progressive multifocal scleral lens, 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; The central optical zone (1) comprises a near vision zone (11) located at the lower part, a far vision zone (12) located at the upper part, and a visual buffer zone (13) arranged between the far vision zone (12) and the near vision zone (11); The landing zone (3) comprises a connecting portion (31) integrally connected to the transition zone (2), a contact portion (32) in contact with the sclera, and a supporting portion (33) obliquely arranged between the connecting portion (31) and the contact portion (32); The connecting portion (31) is arranged to be tilted outward and downward along the extension direction of the transition zone (2), and the connecting portion (31) is connected to the contact portion (32) via a bending portion (34). The bending portion (34) is arranged at an angle, and the contact portion (32) is arranged upward and inward along the extension direction of the bending portion (34). One end of the supporting portion (33) is integrally formed with the connecting portion (31), and the other end is a free end that abuts against the contact portion (32). The cross section of the supporting portion (33), the connecting portion (31), the bending portion (34), and the contact portion (32) forms a triangular structure.

2. The aspheric progressive addition scleral lens according to claim 1, wherein: The bending angle of the bending portion (34) ranges from 5° to 15°.

3. The aspheric progressive addition scleral lens according to claim 2, wherein: The triangular structure is an isosceles triangle.

4. The aspheric progressive addition scleral lens according to claim 3, wherein: The connecting portion (31) and the supporting portion (33) are both provided with through holes (35) for ventilation.

5. The aspheric progressive addition scleral lens according to claim 1, wherein: The near vision zone (11) is circular with an opening, and has a first focus and a first optical center. Light passing through the first optical center forms a virtual image on a focal plane of the first focus. The far vision zone (12) is an area of ​​the remaining portion of the central optical zone, and has a second focus and a second optical center. Light passing through the second optical center forms a virtual image on a focal plane of the second focus.

6. The aspheric progressive addition scleral lens according to claim 5, wherein: The opening is the visual buffer zone (13).

7. The aspheric progressive addition scleral lens according to claim 5, wherein: The near vision zone (11) occupies 1 / 4-1 / 3 of the area of ​​the central optical zone (1); an astigmatism zone (14) is further provided in the lower part of the central optical zone (1), and the astigmatism zone is located outside the near vision zone (11).

8. The aspheric progressive addition scleral lens according to claim 5, wherein: The near vision zone (11) is located on a side close to the corner of the eye.

9. The aspheric progressive addition scleral lens according to claim 5, wherein: The central thickness of the central optical zone (1) is 0.05 mm to 0.08 mm.

10. A method for fitting glasses, characterized in that: The aspheric progressive multifocal scleral lens according to any one of claims 1 to 9 can be configured by using the lens fitting method; S1. Determine the distance vision power and determine the wearer's distance vision equivalent spherical lens through the vertex conversion algorithm; S2. Determine the primary / secondary eye; S3, confirm the addition of light; For early stage presbyopia within +1.50D, use low-power lenses; For severe presbyopia of +1.75D to +2.50D, high and low light addition lenses should be used; S4, after ten minutes of trial wearing, check the lens fit and position it through the landing area (3); S5. Perform additional photometric correction under normal indoor lighting.

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