Aspheric progressive multi-focus sclera lens and lens matching method thereof

Abstract

The invention relates to the technical field of ophthalmic optics, in particular to an aspheric progressive multi-focus sclera lens and a lens matching method thereof, and the aspheric progressive multi-focus sclera lens comprises a central optical area, a transition area and a landing area. The landing area comprises a connecting part, a contact part and a supporting part. The connecting part and the contact part are connected through the bending part, the contact part is arranged upwards and inwards in the extending direction of the bending part, one end of the supporting part and the connecting part are integrally formed, the other end of the supporting part is a free end and abuts against the contact part, and a triangular structure is formed between the supporting part and the cross sections of the connecting part, the bending part and the contact part. The landing area is arranged to be of the triangular structure formed by the connecting part, the bending part, the contact part and the supporting part, and the triangular structure has good stability, so that the supporting effect of the landing area is good, and the stability of the whole sclera lens structure is improved. Therefore, the position of the central optical area relative to the cornea is more stable, the sclera lens is prevented from moving, and the use of the multi-focus progressive sclera lens is ensured.

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 increase of electronic products, vision problems such as myopia or astigmatism are also increasing. Currently, the two methods of correcting vision are generally wearing frame glasses and contact lenses. Among them, the commonly used hard contact lenses are directly in contact with the cornea and worn on the cornea. However, there are more sensory nerve cells on the cornea, which are more sensitive to contact objects. When hard contact lenses are worn directly on the cornea, patients with eye diseases such as dry eyes and keratoconus will be at risk of aggravating the foreign body sensation or other discomfort symptoms caused by them.

[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 scleral area outside the corneal edge 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 will provide clear near vision, but blurred far vision will occur because the image is formed in front of the retina. In addition, many patients suffer from myopia due to severe dry eyes, 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 switch constantly when looking at near and far objects, which will cause eye fatigue. Currently, multifocal lenses only exist 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 support effect is poor. Therefore, multifocal scleral lenses have poor support, which makes it difficult for multifocal scleral lenses to be marketed. Summary of the invention

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an aspherical 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, and the scleral lens and the cornea are supported by tears and a landing area in contact with the sclera, resulting in poor supporting effect. Therefore, multifocal scleral lenses have poor supporting properties, which makes it difficult for multifocal scleral lenses to be marketed.

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

[0007] On the one hand, an embodiment of the present invention provides an aspherical progressive multifocal scleral lens, comprising a central optical zone, a transition zone arranged at the periphery of the central optical zone and in an annular shape, and a landing zone arranged at the periphery of the transition zone and in an annular shape, the inner surface of which contacts 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 area includes a connecting portion integrally connected with the transition area, 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 inclined outward and downward along the extension direction of the transition zone, and the connecting portion is connected to the contact portion via 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 remaining area 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 fitting glasses, by which an aspherical progressive multifocal scleral lens can be fitted;

[0020] S1. Determine the distance vision diopter 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 to add 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 fitting status and position it through the landing area;

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

[0027] The beneficial effects of the present invention are as follows: the non-spherical progressive multi-focal scleral lens of the present invention sets the landing area into a triangular structure formed by a connecting part, a curved part, a contact part and a supporting part, and the triangular structure has good stability, thereby making the supporting effect of the landing area good and improving the stability of the overall scleral lens structure. It can ensure that the position of the central optical zone relative to the cornea is more stable, thereby preventing the scleral lens from moving, so as to ensure the use of the progressive multi-focal scleral lens, and solve the technical problem that the multi-focal lens currently only exists on the corneal contact lens, because the scleral lens and the cornea are supported by the tear fluid and the landing area in contact with the sclera, resulting in poor supporting effect, therefore, the multi-focal scleral lens has poor support, which makes it difficult for the multi-focal scleral lens to be marketed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the aspheric progressive multifocal scleral lens of the present invention;

[0029] Figure 2 The cross-sectional structure diagram of the invented aspheric progressive multifocal scleral lens is shown;

[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 modes in conjunction with the accompanying drawings.

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

[0035] In this embodiment, the central optical zone 1 includes 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 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, so as to achieve the transition from far vision to near vision and reduce the peripheral astigmatism to a level acceptable to the human eye, and can provide clear vision from near to far for patients with presbyopia or cataract surgery. It solves the problem of forming a multifocal progressive lens on a rescleral lens, and has a wider range of applications, and is suitable for patients with myopia caused by eye diseases such as severe dry eye and keratoconus.

[0036] In this embodiment, the landing area 3 includes a connecting portion 31 connected to the transition area 2, a contact portion 32 in contact with the sclera, and a support portion 33 obliquely arranged between the connecting portion 31 and the contact portion 32. The connecting portion 31 is arranged obliquely outward and downward along the extension direction of the transition area 2, and the connecting portion 31 and the contact portion 32 are connected through 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 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-sections of the support portion 33, the connecting portion 31, the bending portion 34, and the contact portion 32 form 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 the present embodiment, a non-spherical progressive multi-focal scleral lens is provided with a landing area 3 formed by a connecting portion 31, a curved portion 34, a contact portion 32 and a supporting portion 33, and the triangular structure has good stability, thereby making the supporting effect of the landing area 3 good and improving the stability of the overall scleral lens structure. It can ensure that the position of the central optical zone 1 relative to the cornea is more stable, thereby preventing the scleral lens from moving, so as to ensure the use of the multi-focal scleral lens, and solve the technical problem that the multi-focal lens currently only exists on corneal contact lenses, and the scleral lens and the cornea are supported by the tear fluid and the landing area in contact with the sclera, resulting in poor supporting effect. Therefore, the multi-focal scleral lens has poor supporting performance, which makes it difficult for the multi-focal scleral lens to be marketed.

[0039] Furthermore, the bending angle of the bending portion 34 is in the range of 5°-15°. The setting of this angle can ensure the support function while preventing eye wear, and this angle 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 the support stability is better, which greatly improves the firmness between the landing area 3 and the sclera.

[0041] Furthermore, a through hole 35 for the circulation of tears is provided on both the connecting portion 31 and the supporting portion 33. The through hole 35 can provide sufficient oxygen to the cornea, promote the discharge of bubbles and metabolites under the lens, and greatly improve the comfort of the wearer.

[0042] Further, the near vision zone 11 is circular with an opening, and the near vision zone 11 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 12 is the area of ​​the remaining part of the central optical zone, and the far vision zone 12 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. 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.

[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, and 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. By providing the astigmatism zone 14 to meet the needs of different patients, the adaptability range is wider.

[0045] Furthermore, the near vision zone 11 is located on one side close to the corner of the eye, which can provide a better visual effect when the patient is near vision, and also increases the area of ​​other functional zones.

[0046] Furthermore, the central thickness of the central optical zone 1 is 0.05 mm to 0.08 mm. 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 the existing scleral lens, thereby making the wearer more comfortable.

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

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

[0049] S2. Determine the primary / secondary eye. It should be noted that the primary eye is generally the eye that is used more often or determines the 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~+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 through the landing area 3; a good fit includes good center positioning and appropriate sliding.

[0054] S5. Perform additional photometric correction under normal indoor lighting, such as reading a newspaper and then checking the distance 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] To improve distance vision: add -0.25D to the dominant eye or change the high-low plus on the dominant eye to low-low plus. To improve near vision: add +0.25D to the accessory eye or change the lens on the accessory eye to 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 as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be 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 be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0060] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. 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 invention. In this specification, the schematic representations 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 the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0061] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of 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 aspherical progressive multifocal scleral lens, characterized in that: It comprises a central optical zone (1), a transition zone (2) arranged at the periphery of the central optical zone (1) and in an annular shape, and a landing zone (3) arranged at 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 area (3) comprises a connecting portion (31) integrally connected to the transition area (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 inclined 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); and the cross-sections of the supporting portion (33), the connecting portion (31), the bending portion (34), and the contact portion (32) form a triangular structure.

2. The aspheric progressive multifocal scleral lens according to claim 1, characterized in that: The bending angle of the bending portion (34) is in the range of 5°-15°.

3. The aspheric progressive multifocal scleral lens according to claim 2, characterized in that: The triangular structure is an isosceles triangle.

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

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

6. The aspheric progressive multifocal scleral lens according to claim 5, characterized in that: The opening is the visual buffer zone (13).

7. The aspheric progressive multifocal scleral lens according to claim 5, characterized in that: The near vision zone (11) occupies 1 / 4-1 / 3 of the area of ​​the central optical zone (1), and a stray light zone (14) is also provided in the lower part of the central optical zone (1), and the stray light zone is located outside the near vision zone (11).

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

9. The aspheric progressive multifocal scleral lens according to claim 5, characterized in that: 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 diopter and determine the wearer's distance vision equivalent spherical lens through the vertex conversion algorithm; S2, determine the primary / secondary eye; S3, confirm to add light; For early stage presbyopia (within +1.50D), choose low-addition lenses; For severe presbyopia (+1.75D to +2.50D), choose high and low light addition lenses; S4, after ten minutes of trial wearing, check the lens fitting status and position it through the landing area (3); S5. Perform additional photometric correction under normal indoor lighting.

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