Multi-focus sclera lens

Abstract

The utility model relates to a multi-focus sclera lens which comprises an inner surface and an outer surface which are both cambered surfaces. The inner surface can be located on the sclera, and a bifocal area is coaxially arranged in the center of the outer surface. The bifocal region can be located above the cornea, including a near-vision region and a far-vision region extending concentrically outward from a periphery of the near-vision region. The diopters of the far-sighted areas are the same and are myopic diopters; or, the diopter is hyperopia diopter; or the diopter is astigmatism diopter; or the diopter is the superposition of the myopia diopter and the astigmatism diopter; or the diopter is the superposition of the hyperopia diopter and the astigmatism diopter. The diopters of the near-vision areas are the same and are optometry near-vision prescriptions. The vertical projection area of the distant vision area is larger than the vertical projection area of the first optical area. The area of the near vision area falling into the pupil vertical projection range can be larger than or smaller than the area of the far vision area falling into the pupil vertical projection range. The double-focus area is matched with an automatic pupil dilation and contraction mechanism, and the near-vision and far-vision requirements of patients with presbyopia such as keratoconus, high refractive error, xerophthalmia and corneal trauma are met.

Description

Technical Field

[0001] The utility model relates to the technical field of contact lenses, in particular to a multifocal scleral lens. Background Art

[0002] The full scleral lens is a rigid oxygen-permeable contact lens that can support on the sclera without contacting the cornea for vision correction. Therefore, when wearing the full scleral lens, the stimulation to the cornea is small, and it is suitable for people suffering from corneal diseases such as irregular corneal astigmatism, severe dry eye, corneal degeneration or dystrophy, and corneal trauma. However, the current full scleral lens is only provided with a single focus for correcting distant vision. For older presbyopic patients, due to the decline of the eye's accommodation ability, presbyopia will occur simultaneously in the eyes. When presbyopic patients wear the scleral lens, they can see clearly at a distance, but when looking near, the vision is blurred because the image is formed in front of the retina, and near fatigue will also occur. Content of the Utility Model

[0003] (1) Technical Problems to be Solved

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a multifocal scleral lens, which solves the technical problem that the current full scleral lens is only provided with a single focus for correcting myopia.

[0005] (2) Technical Solutions

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

[0007] An embodiment of the utility model provides a multifocal scleral lens, which includes an inner surface and an outer surface that are both arc-shaped; the inner surface can be located on the sclera, and a bifocal area is coaxially arranged at the center of the outer surface;

[0008] The bifocal area can be located above the cornea and includes a near vision area and a far vision area that extends concentrically outward from the periphery of the near vision area; the refractive powers of the far vision area are the same and are myopic refractive powers; or, hyperopic refractive powers; or, astigmatic refractive powers; or, a superposition of myopic refractive powers and astigmatic refractive powers; or, a superposition of hyperopic refractive powers and astigmatic refractive powers; the refractive powers of the near vision area are the same and are the prescription for near vision during optometry; the vertical projection area of the far vision area is larger than the vertical projection area of the near vision area;

[0009] The area of the near vision area falling within the vertical projection range of the pupil can be larger or smaller than the area of the far vision area falling within the vertical projection range of the pupil.

[0010] According to the present invention, the vertical projection of the near vision area is circular, the vertical projection of the far vision area is annular, and the entities of both are aspherical.

[0011] According to the present invention, the radius of the vertical projection of the outer ring of the distance vision area is 8 - 10 mm.

[0012] According to the present invention, the vertical projection area of the near vision area is greater than or equal to the minimum vertical projection area of the pupil and less than or equal to 2 / 3 of the maximum vertical projection area of the pupil.

[0013] According to the present invention, the radius of the vertical projection of the near vision area is 2 ± 1.5 mm.

[0014] According to the present invention, the base curve area, the transition area, and the landing area are successively and continuously arranged along the radial direction from the inside to the outside on the outer surface, and the three are concentric;

[0015] The base curve area is spherical and its vertical projection is circular, the transition area is aspherical and its vertical projection is annular, and the vertical projection of the landing area is annular;

[0016] The base curve area can be located above the cornea, the transition area can be located above the corneal limbus, and the landing area can be located on the sclera.

[0017] According to the present invention, the base curve area and the transition area can enclose a cavity for accommodating tears with the cornea;

[0018] The height of the cavity is 100 - 300 μm.

[0019] According to the present invention, the diameter of the vertical projection of the base curve area is 4 - 13.5 mm, and the sagittal height is 0.24 - 2.85 mm;

[0020] The diameter of the vertical projection of the transition area is 12 - 14 mm, and the sagittal height is 1.21 - 7.91 mm;

[0021] The diameter of the vertical projection of the landing area is 14 - 17 mm, and the sagittal height is 0.9 - 5.98 mm.

[0022] According to the present invention, the outer surface is composed of the base curve area, the transition area, and the landing area;

[0023] The inner surface is composed of the bifocal area and the circumferential area extending concentrically outward from the periphery.

[0024] (III) Beneficial effects

[0025] The beneficial effects of the present utility model are as follows: For the multifocal scleral lens of the present utility model, the diopter of the near-vision area in the bifocal area provided on its outer surface is the optometry near-vision prescription, which can correct the clarity of the image of a nearby object falling on the retina. The diopter of the far-vision area is myopic diopter or hyperopic diopter or astigmatic diopter or the superposition of myopic diopter and astigmatic diopter or the superposition of hyperopic diopter and astigmatic diopter, which can correct the clarity of the image of a distant object falling on the retina. After wearing this scleral lens, keeping the optical axis of the scleral lens and the optical axis of the pupil coaxial, it can be supported on the sclera, avoiding contact damage to the cornea. Then, through the bifocal area provided on the outer surface and the automatic scaling mechanism of the pupil under different intensities of light, it can be applicable to both near-vision and far-vision scenarios simultaneously (wherein, the near distance refers to the distance between the eyes and the observed object at the centimeter level, and the far distance refers to the distance between the eyes and the observed object at the meter level), so as to meet the near-vision and far-vision requirements of presbyopic patients suffering from keratoconus, high refractive error, dry eye disease, corneal trauma, etc. when wearing scleral lenses.

[0026] Among them, when near vision is required: the external light is brightened so that the pupil contracts to an area where the near-vision area falling within the vertical projection range of the pupil is larger than the area where the far-vision area falls within the vertical projection range of the pupil. At this time, the brain can receive a larger number or all of the images of nearby objects falling on the retina corrected by the near-vision area, and when receiving the images corrected by both the near-vision area and the far-vision area simultaneously, it can ignore the images corrected by the far-vision area, and then analyze and obtain a clear image of the nearby object.

[0027] When far vision is required: the external light is dimmed so that the pupil dilates to an area where the far-vision area falling within the vertical projection range of the pupil is larger than the area where the near-vision area falls within the vertical projection range of the pupil. At this time, the brain can receive a larger number of images of distant objects falling on the retina corrected by the far-vision area, and ignore the images of nearby objects falling on the retina corrected by the near-vision area, and then analyze and obtain a clear image of the nearby object. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional perspective view when the scleral lens of the present utility model is worn;

[0029] Figure 2 It is a cross-sectional perspective view of the scleral lens;

[0030] Figure 3 It is a corresponding schematic diagram of the side cross-sectional view and the upward-looking front view of the scleral lens;

[0031] Figure 4 It is a corresponding schematic diagram of the side cross-sectional view and the downward-looking front view of the scleral lens.

[0032]

DESCRIPTION OF THE REFERENCE NUMERALS

[0033] 1: Scleral lens; 11: Inner surface; 12: Outer surface; 13: Near vision area; 14: Distant vision area; 15: Base curve area; 16: Transition area; 17: Landing area;

[0034] a: Cavity;

[0035] A: Sclera; B: Cornea; C: Corneoscleral limbus; D: Iris; E: Pupil. Detailed implementation mode

[0036] For better explaining the present utility model for easy understanding, the present utility model will be described in detail below in conjunction with the accompanying drawings through specific implementation modes.

[0037] See Figures 1-4 , a multifocal scleral lens provided by the present invention includes an inner surface 11 and an outer surface 12 that are both arc-shaped. The inner surface 11 can be located on the sclera A, and a bifocal area is coaxially arranged at the center of the outer surface 12.

[0038] The bifocal area can be located above the cornea B and includes a near vision area 13 and a distant vision area 14 that extends concentrically outward from the periphery of the near vision area 13. The refractive powers of the distant vision area 14 are the same and are myopic refractive powers; or, are hyperopic refractive powers; or, are astigmatic refractive powers; or, are the superposition of myopic refractive powers and astigmatic refractive powers; or, are the superposition of hyperopic refractive powers and astigmatic refractive powers. The refractive powers of the near vision area 13 are the same and are the near vision prescription obtained by optometry. The vertical projection area of the distant vision area 14 is larger than the vertical projection area of the first optical area. The area of the near vision area 13 falling within the vertical projection range of the pupil E can be larger or smaller than the area of the distant vision area 14 falling within the vertical projection range of the pupil E.

[0039] Among them, the near vision prescription obtained by optometry refers to the refractive power obtained by an optometrist through optometry examination of the wearer, and it can be a positive degree or a negative degree.

[0040] Specifically, the setting principle of the near vision area 13 and the distant vision area 14 is as follows:

[0041] When the wearer is a presbyopic patient with astigmatism: The overall refractive power of the distant vision area 14 can be set according to the astigmatic refractive power actually obtained by optometry of the wearer. The near vision prescription obtained by optometry is specifically the superposition of presbyopic refractive power and astigmatic refractive power.

[0042] When the wearer is a presbyopic patient with myopia or hyperopia: The overall refractive power of the distant vision area 14 can be set according to the myopic refractive power or hyperopic refractive power actually obtained by optometry of the wearer. The near vision prescription obtained by optometry is specifically the sum value of the myopic refractive power of the distant vision area 14 and the presbyopic refractive power; or, is the sum value of the hyperopic refractive power and the presbyopic refractive power.

[0043] When the wearer is a presbyopic patient with both myopia and astigmatism or both hyperopia and astigmatism: According to the myopic refractive power or hyperopic refractive power obtained from the actual optometry of the wearer, and the astigmatic refractive power, the overall myopic refractive power or hyperopic refractive power of the distance vision area 14 can be set accordingly, and the astigmatic refractive power is superimposed throughout the distance vision area 14. The specific optometry near vision prescription is the sum of the myopic refractive power and the presbyopic refractive power in the distance vision area 14 and the superimposition of the astigmatic refractive power; or, it is the sum of the hyperopic refractive power and the presbyopic refractive power in the distance vision area 14 and the superimposition of the astigmatic refractive power.

[0044] Therefore, this scleral lens can be worn by presbyopic patients with different myopia or hyperopia or astigmatism degrees (including those with relatively high myopia, hyperopia or astigmatism degrees).

[0045] It should be noted that the cornea B of the eye covers the outside of the iris D, and the center of the iris D has a pupil E. In light of different intensities, the iris D can correspondingly adjust the size of the pupil E to achieve the automatic expansion and contraction of the pupil E. After wearing this scleral lens, the near vision area 13 and the distance vision area 14 can be located above the cornea B, that is, the vertical projection ranges of the near vision area 13 and the distance vision area 14 can cover the pupil E at the center of the iris D.

[0046] For this scleral lens, the refractive power of the near vision area 13 in the bifocal area set on its outer surface 12 is the optometry near vision prescription, which can correct the clarity of the image of a nearby object falling on the retina. The refractive power of the distance vision area 14 is the myopic refractive power or the hyperopic refractive power or the astigmatic refractive power or the superimposition of the myopic refractive power and the astigmatic refractive power or the superimposition of the hyperopic refractive power and the astigmatic refractive power, which can correct the clarity of the image of a distant object falling on the retina. After wearing this scleral lens, keeping the optical axis of the scleral lens and the optical axis of the pupil E coaxial, it can be supported on the sclera A to avoid contact damage to the cornea B. Then, through the cooperation of the bifocal area set on the outer surface 12 and the automatic expansion and contraction mechanism of the pupil in light of different intensities, it can be applicable to both near vision scenarios and distance vision (wherein, the near distance refers to the distance between the eyes and the observed object being in the centimeter level, and the far distance refers to the distance between the eyes and the observed object being in the meter level) to meet the near vision and distance vision needs of presbyopic patients with keratoconus, high refractive error, dry eye, corneal trauma, etc. when wearing scleral lenses.

[0047] Among them, when near vision is required: The external light is brightened so that the pupil E contracts to an area where the near vision area 13 falling within the vertical projection range of the pupil E is larger than the area where the distance vision area 14 falls within the vertical projection range of the pupil E. At this time, the brain can receive a larger number or all of the images of nearby objects corrected by the near vision area 13 falling on the retina, and when receiving the images corrected by both the near vision area 13 and the distance vision area 14 at the same time, it can ignore the images corrected by the distance vision area 14, and then analyze and obtain clear images of nearby objects.

[0048] When distance vision is required: the external light is dimmed so that the pupil E is enlarged until the area of the distance vision area 14 falling within the vertical projection range of the pupil E is greater than the area of the near vision area 13 falling within the vertical projection range of the pupil E. At this time, the brain can receive a larger number of images of distant objects corrected by the distance vision area 14 falling on the retina and ignore the images of nearby objects corrected by the near vision area 13 falling on the retina, and then analyze and obtain clear images of nearby objects.

[0049] It should be noted that the user wearing this scleral lens can brighten the external light by turning on the light, prompting the pupil E to shrink until the area of the near vision area 13 falling within the vertical projection range of the pupil E is greater than the area of the distance vision area 14 falling within the vertical projection range of the pupil E for near vision. When the external light is relatively bright, it can also prompt the pupil E to shrink until the near vision area 13 completely covers the vertical projection range of the pupil E, so that the brain can only receive clear near images projected onto the retina by the near vision area 13, improving the clarity of near vision. The wearer can also dim the external light by wearing sunglasses in addition, so as to prompt the pupil E to enlarge until the area of the distance vision area 14 falling within the vertical projection range of the pupil E is greater than the area of the near vision area 13 falling within the vertical projection range of the pupil E for distance vision.

[0050] Furthermore, the vertical projection of the near vision area 13 is circular, and the vertical projection of the distance vision area 14 is annular, so that both areas can match the pupil E with a circular vertical projection, so as to keep coaxial with the optical axis of the pupil E after wearing.

[0051] Specifically, both the near vision area 13 and the distance vision area 14 are coaxial with the optical axis of the scleral lens.

[0052] Specifically, both the near vision area 13 and the distance vision area 14 are aspherical, so that the curvatures of different regions of the near vision area 13 and the distance vision area 14 are different, thereby correcting the images projected onto the retina through the near vision area 13 and the distance vision area 14, solving problems such as distorted vision, and at the same time making the scleral lens lighter, thinner and flatter, with excellent impact resistance.

[0053] Specifically, the vertical projection area of the near vision area 13 is greater than or equal to the minimum vertical projection area of the pupil E and less than or equal to 2 / 3 of the maximum vertical projection area of the pupil E.

[0054] Under normal conditions, the vertical projection area of the pupil E is within the range of the minimum vertical projection area and 2 / 3 of the maximum vertical projection area. Therefore, the pupil E under different light intensities can at least partially correspond to the vertical projection range of the near vision area 13 (that is, the vertical projection radius of the pupil E is greater than, equal to or less than the vertical projection radius of the near vision area 13) to meet the near vision requirements.

[0055] Preferably, the radius of the vertical projection of the near vision zone 13 is 2±1.5 mm, corresponding to the range from the minimum vertical projection radius to 2 / 3 of the maximum vertical projection radius when the pupil E of most people is in a contracted or expanded state.

[0056] Preferably, the radius of the vertical projection of the outer ring of the far vision zone 14 is 8-10 mm, corresponding to the vertical projection radius of the iris D of most people, so that the pupil E located at the center of the iris D in different contraction and expansion states can all correspond to the range of the far vision zone 14 (meaning that the vertical projection radius of the pupil E is less than or equal to the vertical projection area of ​​the far vision zone 14) to meet the far vision requirements.

[0057] Furthermore, the outer surface 12 is provided with a base arc area 15, a transition area 16 and a landing area 17 in sequence from the inside to the outside in the radial direction, and the three areas are concentric.

[0058] The base curve area 15 is spherical and its vertical projection is circular, the transition area 16 is aspherical and its vertical projection is annular, and the landing area 17 is spherical and its vertical projection is annular. The base curve area 15 can be located above the cornea B, the transition area 16 can be located above the corneoscleral limbus C, and the landing area 17 can be located on the sclera A.

[0059] The landing area 17 fits the shape of the sclera and can be stably supported on the sclera to avoid contact and irritation of the cornea. It is suitable for people with corneal diseases.

[0060] Specifically, the base curve area 15, the transition area 16 and the landing area 17 are all coaxial with the optical axis of the scleral lens, so as to be coaxial with the optical axis of the pupil E after wearing.

[0061] Specifically, the base curve area 15 and the transition area 16 can enclose with the cornea B to form a cavity a for containing tears, so as to provide a continuous eye water bath effect for patients with dry eyes, alleviate the discomfort of dry eyes patients wearing scleral lenses, and be suitable for patients with refractive errors (myopia, hyperopia, astigmatism), dry eyes and presbyopia, further expanding the applicable population of the scleral lens.

[0062] Specifically, the height of the cavity a is 100-300 μm.

[0063] The diameter of the vertical projection of the base arc region 15 is 4-13.5 mm, and the sagittal height is 0.24-2.85 mm.

[0064] The diameter of the vertical projection of the transition zone 16 is 12-14 mm, and the sagittal height is 1.21-7.91 mm.

[0065] The diameter of the vertical projection of the landing area 17 is 14-17 mm, and the rise is 0.9-5.98 mm.

[0066] The above-mentioned numerical setting of the inner surface 11 of the present scleral lens is suitable for use by most people.

[0067] Further, the inner surface 11 consists of a bifocal zone and a circumferential zone that extends concentrically outward from the periphery. The outer surface 12 consists of a base curve zone 15, a transition zone 16, and a landing zone 17. The structure of this scleral lens is simple and convenient for processing.

[0068] Further, in the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0069] In the present utility model, unless otherwise clearly defined and limited, when a first feature is "on" or "under" a second feature, it can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when the first feature is "above", "over" and "on top of" the second feature, it can be that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. When the first feature is "under", "beneath" and "underneath" the second feature, it can be that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0070] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection 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 a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0071] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present utility model.

Claims

1. A multifocal scleral lens, characterized in that, It includes an inner surface (11) and an outer surface (12) that are both arc-shaped; the inner surface (11) can be seated on the sclera (A), and a bifocal area is coaxially arranged at the center of the outer surface (12); The bifocal area can be located above the cornea (B) and includes a near vision area (13) and a far vision area (14) that extends concentrically outward from the periphery of the near vision area (13); the refractive powers of the far vision area (14) are the same and are myopic refractive powers; or, are hyperopic refractive powers; or, are astigmatic refractive powers; or, are a superposition of myopic refractive powers and astigmatic refractive powers; or, are a superposition of hyperopic refractive powers and astigmatic refractive powers; the refractive powers of the near vision area (13) are the same and are the prescription for near vision during optometry; the vertical projection area of the far vision area (14) is larger than the vertical projection area of the near vision area (13); When looking at near objects, the area of the near vision area (13) that falls within the vertical projection range of the pupil (E) can be larger than the area of the far vision area (14) that falls within the vertical projection range of the pupil (E); When looking at far objects, the area of the near vision area (13) that falls within the vertical projection range of the pupil (E) can be smaller than the area of the far vision area (14) that falls within the vertical projection range of the pupil (E).

2. The multifocal scleral lens according to claim 1, wherein The vertical projection of the near vision area (13) is circular, and the vertical projection of the far vision area (14) is annular.

3. The multifocal scleral lens according to claim 2, wherein The radius of the vertical projection of the outer ring of the far vision area (14) is 8 - 10 mm.

4. The multifocal scleral lens according to claim 2, wherein, The vertical projection area of the near vision area (13) is greater than or equal to the minimum vertical projection area of the pupil (E) and less than or equal to 2 / 3 of the maximum vertical projection area of the pupil (E).

5. The multifocal scleral lens according to claim 3, wherein The radius of the vertical projection of the near vision area (13) is 2 ± 1.5 mm.

6. The multifocal scleral lens according to claim 1, wherein The outer surface (12) is successively and continuously provided with a base curve area (15), a transition area (16), and a landing area (17) from the inside to the outside along the radial direction, and the three are concentric; The base curve area (15) is spherical and its vertical projection is circular, the transition area (16) is aspherical and its vertical projection is annular, and the vertical projection of the landing area (17) is annular; The base curve area (15) can be located above the cornea (B), the transition area (16) can be located above the corneoscleral limbus (C), and the landing area (17) can be seated on the sclera (A).

7. The multifocal scleral lens according to claim 6, wherein, The base curve area (15) and the transition area (16) can enclose a cavity (a) for accommodating tears with the cornea (B); The height of the cavity (a) is 100 - 300 μm.

8. The multifocal scleral lens according to claim 6, wherein, The diameter of the vertical projection of the base curve area (15) is 4 - 13.5 mm, and the sagittal height is 0.24 - 2.85 mm; The diameter of the vertical projection of the transition area (16) is 12 - 14 mm, and the sagittal height is 1.21 - 7.91 mm; The diameter of the vertical projection of the landing area (17) is 14 - 17 mm, and the sagittal height is 0.9 - 5.98 mm.

9. The multifocal scleral lens according to claim 6, wherein The outer surface (12) is composed of the base curve area (15), the transition area (16), and the landing area (17); The inner surface (11) consists of the bifocal zone and a circumferential zone that extends concentrically outward from the outer periphery.

Images