sclerophane

Abstract

The present application relates to scleral lens technical field, especially a kind of scleral lens, the inner surface of scleral lens includes sequentially connected central optical zone, peripheral optical zone, transition zone, landing zone and peripheral zone along radial direction, central optical zone and peripheral optical zone are arranged in front of the cornea of user, transition zone is arranged in front of the limbus of user, landing zone contacts the sclera of user, peripheral zone is used for tear exchange, the tangent between the first point of peripheral optical zone and the first line in wearing state is a=A+B, B=k×cos2θ, A is the average inclination angle of the cornea of user, k is correction coefficient, in the right angle function that the center of central optical zone is zero point, horizontal direction is X axis, vertical direction is Y axis, the connecting line between the projection of first point on right angle function and zero point is second line, θ is the angle of X axis positive direction to second line, first line is parallel to the axis of central optical zone.

Description

Technical Field

[0001] The present invention relates to the technical field of scleral lenses, and in particular to a scleral lens. Background Art

[0002] The cornea 100 and the limbus 200 of the human eye are not a rotationally symmetrical circular surface. Figure 1 As shown, the diameter of the limbus 200 in the 0°-180° direction is generally smaller than the diameter of the limbus 200 in the 90°-270° direction. Because the limbus 200 is the area where corneal stem cells reside, the lens area corresponding to the limbus 200 region should be given special attention during lens design when wearing scleral lenses. When wearing rotationally symmetrical scleral lenses currently on the market, while the optical zone of the lens is appropriately sized in the 0°-180° direction of the cornea, the lens size in the 90°-270° direction will be too large. This can also cause compression of the limbus 200 region in the 0°-180° direction and excessive gaps below the limbus 200 in the 90°-270° direction. Long-term wear can cause complications such as midday fogging.

[0003] Therefore, there is an urgent need for a scleral lens to solve the above problems. Summary of the Invention

[0004] The object of the present invention is to provide a scleral lens that can prevent complications such as foggy vision.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A scleral lens is provided, the inner surface of which includes a central optical zone, a peripheral optical zone, a transition zone, a landing zone and a peripheral zone connected in sequence along the radial direction, the central optical zone and the peripheral optical zone are arranged in front of the user's cornea at intervals, the transition zone is arranged in front of the user's corneal limbus at intervals, the landing zone contacts the user's sclera, and the peripheral zone is used for tear exchange. When the scleral lens is worn, the angle between the tangent line at the first point of the peripheral optical zone and the first line is a=A+B, B=k×cos2θ, wherein A is the average tilt angle of the user's corneal periphery, k is a correction coefficient, and in a rectangular function formed with the center of the central optical zone as the zero point, the horizontal direction as the X-axis, and the vertical direction as the Y-axis, the line connecting the projection of the first point on the rectangular function and the zero point is the second line, θ is the angle from the positive direction of the X-axis to the second line, and the first line is parallel to the axis of the central optical zone.

[0007] As a preferred solution for the scleral lens, when θ is 0, π or 2π, and k≥0, the value range of the angle a is 15.00°-67.35°.

[0008] As a preferred solution for the scleral lens, when θ is π / 2 or 3π / 2 and k≥0, the value range of the angle a is 9.00°-61.35°.

[0009] As a preferred solution for the scleral lens, the correction coefficient k satisfies -3≤k≤3.

[0010] As a preferred solution of the scleral lens, the diameter width d11 of the peripheral optical zone ranges from 10 mm to 17 mm.

[0011] As a preferred solution for scleral lenses, the positions of the landing areas corresponding to the two ends of the user's astigmatism axis are raised further forward than other positions, and the positions of the landing areas corresponding to the two ends perpendicular to the direction of the astigmatism axis are pressed further backward than other positions.

[0012] As a preferred embodiment of the scleral lens, the diameter width d10 of the central optical zone is in the range of 5 mm to 15 mm, the central optical zone is configured such that the vertical distance between the central optical zone and the cornea is in the range of 100 μm to 300 μm, and the space between the central optical zone and the cornea is filled with tear fluid.

[0013] As a preferred embodiment of the scleral lens, the transition zone is configured such that the vertical distance from the corneal limbus ranges from 50 μm to 100 μm, the diameter width d12 of the transition zone ranges from 11.00 mm to 19.00 mm, and the surface shape of the transition zone is an arc surface or a section surface.

[0014] As a preferred solution for scleral lenses, the diameter width d13 of the landing zone ranges from 15 mm to 20 mm, and the surface shape of the landing zone is a spherical surface or multiple connected spherical surfaces or a section surface.

[0015] As a preferred solution of the scleral lens, the diameter width d14 of the peripheral zone ranges from 16 mm to 21 mm, and the surface shape of the peripheral zone is a spherical surface or multiple connected spherical surfaces or a section surface.

[0016] Beneficial effects of the present invention:

[0017] The present invention provides a scleral lens, the inner surface of which includes a central optical zone, a peripheral optical zone, a transition zone, a landing zone and a peripheral zone connected in sequence along the radial direction, the central optical zone and the peripheral optical zone are spaced in front of the user's cornea, the transition zone is spaced in front of the user's corneal limbus, the landing zone contacts the user's sclera, and the peripheral zone is used for tear exchange. When the scleral lens is worn, the angle between the tangent line at the first point of the peripheral optical zone and the first line is a=A+B, B=k×cos2θ, wherein A is the average tilt angle of the user's corneal periphery, k is a correction coefficient, and in a rectangular function formed with the center of the central optical zone as the zero point, the horizontal direction as the X-axis, and the vertical direction as the Y-axis, the line connecting the projection of the first point on the rectangular function and the zero point is the second line, θ is the angle from the positive direction of the X-axis to the second line, and the first line is parallel to the axis of the central optical zone. The tilt of the peripheral optical zone of the scleral lens can continuously change along the circumference to adapt to the differences in the thickness and tilt of the human corneal limbus along the circumference, so as to ensure the uniformity of the thickness of the gap between the corneal limbus and the scleral lens along the circumference as much as possible, and prevent the problem of excessive gap between some areas of the eyeball and other areas, thereby preventing complications such as foggy vision. Because the value of B changes with the position of the first point along the circumference, as the first point rotates along the circumference, when the value of θ changes from 0 to π / 2, the value of B changes from maximum to minimum, that is, when the value of A remains unchanged, the value of angle a changes from maximum to minimum, so that the tilt of the peripheral optical zone of the scleral lens can be gradually changed within 90 degrees to adapt to the different thicknesses and tilts of the corneal limbus at different positions along the circumference. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of part of the structure of the human eye;

[0019] Figure 2 is a schematic diagram of a scleral lens provided by an embodiment of the present invention being worn on the surface of an eyeball;

[0020] Figure 3 is a cross-sectional view of a scleral lens provided by an embodiment of the present invention;

[0021] Figure 4 1 is a schematic structural diagram of a scleral lens provided by an embodiment of the present invention;

[0022] Figure 5 Schematic diagram of the structure of the inner surface of the scleral lens provided by an embodiment of the present invention (the astigmatism axis is in the horizontal direction);

[0023] Figure 6 Schematic diagram of the structure of the inner surface of the scleral lens provided by an embodiment of the present invention (the astigmatism axis is in the vertical direction).

[0024] In the picture:

[0025] 100, cornea; 200, limbus; 300, sclera;

[0026] 1. Inner surface of scleral lens; 10. Central optical zone; 11. Peripheral optical zone; 12. Transition zone; 13. Landing zone; 14. Peripheral zone;

[0027] 2. The outer surface of the scleral lens. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only show portions relevant to the present invention, not all of them.

[0029] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention.

[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0031] like Figure 2-Figure 6As shown, the inner surface of the scleral lens of this embodiment includes a central optical zone 10, a peripheral optical zone 11, a transition zone 12, a landing zone 13 and a peripheral zone 14 connected in sequence along the radial direction. The central optical zone 10 and the peripheral optical zone 11 are spaced in front of the user's cornea 100, the transition zone 12 is spaced in front of the user's cornea 100, the landing zone 13 contacts the user's sclera 300, and the peripheral zone 14 is used for tear exchange. When the scleral lens is worn, the angle between the tangent line at the first point of the peripheral optical zone 11 and the first line is a=A+B, B=k×cos2θ, where A is the average tilt angle of the user's corneal periphery, k is the correction coefficient, and in the rectangular function formed with the center of the central optical zone 10 as the zero point, the horizontal direction as the X-axis, and the vertical direction as the Y-axis, the line connecting the projection of the first point on the rectangular function and the zero point is the second line, θ is the angle between the positive direction of the X-axis and the second line, and the first line is parallel to the axis of the central optical zone 10.

[0032] The degree of inclination of the peripheral optical zone 11 of the scleral lens can be continuously changed along the circumferential direction to adapt to the difference in thickness and inclination of the human corneal limbus 200 along the circumferential direction, so as to ensure the uniformity of the thickness of the gap between the corneal limbus 200 and the scleral lens along the circumferential direction as much as possible, to prevent the problem of excessive gap between some areas of the eyeball and other areas, thereby preventing complications such as foggy vision. Since the value of B changes with the position of the first point along the circumferential direction, as the first point rotates along the circumferential direction, when the value of θ changes from 0 to π / 2, the value of B changes from maximum to minimum, that is, when the value of A remains unchanged, the value of the angle a changes from maximum to minimum, so that the degree of inclination of the peripheral optical zone 11 of the scleral lens can be gradually changed within 90° to adapt to the different thicknesses and inclinations of the corneal limbus 200 at different positions along the circumferential direction. Figure 4 As shown, from the overall perspective, the two ends of the peripheral optical zone 11 in the horizontal direction are lifted forward, and the two ends in the vertical direction are pressed backward. This design is conducive to ensuring the uniformity of the tear layer in all directions of the corneal limbus 200 area and reducing complications such as foggy vision.

[0033] Preferably, when θ is 0, π, or 2π, and k ≥ 0, the angle a ranges from 15.00° to 67.35°. That is, the angle between the peripheral optical zone 11 of the scleral lens, where the tilt is greatest, and the axis of the central optical zone 10 ranges from 15.00° to 67.35°.

[0034] Preferably, when θ is π / 2 or 3π / 2 and k ≥ 0, the angle a ranges from 9.00° to 61.35°. That is, the angle between the peripheral optical zone 11 of the scleral lens, where the tilt is greatest, and the axis of the central optical zone 10 ranges from 9.00° to 61.35°.

[0035] Preferably, the correction coefficient k satisfies -3≤k≤3. When k exceeds this value range, the inclination of the peripheral optical zone 11 along the circumferential direction varies too much, which does not conform to the actual situation of the human eyeball. In addition, the inclination of the peripheral optical zone 11 at the thicker part of the corneal limbus 200 is too small, so that the gap is too large, and the inclination of the peripheral optical zone 11 at the thinner part of the corneal limbus 200 is too large, so that the eyeball is compressed.

[0036] Preferably, the positions of the landing areas 13 corresponding to the two ends of the user's astigmatism axis are raised further forward than other positions, and the positions of the landing areas 13 corresponding to the two ends perpendicular to the direction of the astigmatism axis are pressed further backward than other positions.

[0037] like Figure 5 As shown, when the astigmatism axis is in the horizontal direction, the astigmatism axis of the peripheral zone 14 is consistent with the astigmatism axis of the landing zone 13. At this time, the periphery of the scleral lens presents a shape of being lifted forward in the horizontal direction and pressed backward in the vertical direction.

[0038] like Figure 6 As shown in FIG, when the astigmatism axis is in the vertical direction, the astigmatism axis of the peripheral zone 14 is also consistent with the astigmatism axis of the landing zone 13. At this time, the periphery of the scleral lens presents a shape of being pressed backward in the horizontal direction and lifted forward in the vertical direction.

[0039] Of course, the astigmatism axis is not limited to the two directions of 0-π and π / 2-3π / 2, but can be any direction within the range of 0-2π. The degree of inclination of the landing area 13 is adjusted according to the actual astigmatism axis of the user.

[0040] like Figure 3 As shown, the diameter width of the optical zone of the outer surface of the scleral lens is d2, and the diameter widths at different positions of the inner surface include d10, d11, d12, d13 and d14.

[0041] Preferably, the diameter width d11 of the peripheral optical zone 11 ranges from 10 mm to 17 mm to match the diameter width of the user's cornea 100 .

[0042] Preferably, the diameter width d10 of the central optical zone 10 is in the range of 5 mm to 15 mm. Since the central optical zone 10 needs to cover the position of the pupil, the above value range can ensure that the position of the central optical zone 10 is appropriate, and the vertical distance between the central optical zone 10 and the user's cornea 100 is in the range of 100 μm to 300 μm. The central optical zone 10 and the cornea 100 are filled with tear fluid, and the above thickness of tear fluid is beneficial to the correction effect of the scleral lens.

[0043] Optionally, the surface of the central optical zone 10 can be spherical or aspherical, which can be selected according to the specific situation of the user.

[0044] Preferably, the vertical distance between the transition zone 12 and the user's corneal limbus 200 is in the range of 50 μm to 100 μm, allowing for a certain thickness of tear fluid to pass between the two, thereby achieving the corrective effect of the scleral lens. The width d12 of the transition zone 12 is in the range of 11.00 mm to 19.00 mm, to match the width of the user's corneal limbus 200. The transition zone 12 can be either an arc or a tangent surface, which can be selected based on the user's specific needs.

[0045] Preferably, the width d13 of the landing zone 13 is in the range of 15 mm to 20 mm, so that it contacts the eyeball at the sclera 300 and is comfortable for the user. The landing zone 13 can be a single spherical surface, multiple connected spherical surfaces, or a cross-section, and can be selected based on the user's specific needs.

[0046] Preferably, the diameter width d14 of the peripheral area 14 ranges from 16 mm to 21 mm to ensure the user's comfort. The surface shape of the peripheral area 14 is a spherical surface or multiple connected spherical surfaces or cross-sections, which can be selected according to the specific situation of the user.

[0047] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A scleral lens, characterized in that: The inner surface of the scleral lens comprises a central optical zone (10), a peripheral optical zone (11), a transition zone (12), a landing zone (13) and a peripheral zone (14) connected in sequence along the radial direction. The central optical zone (10) and the peripheral optical zone (11) are arranged in front of the user's cornea (100) at intervals. The transition zone (12) is arranged in front of the user's corneal limbus (200). The landing zone (13) contacts the user's sclera (300). The peripheral zone (14) is used for tear exchange. The scleral lens is in a wearing state. The angle between the tangent line at the first point of the peripheral optical zone (11) and the first line is a=A+B, B=k×cos2θ, wherein A is the average tilt angle of the user's corneal periphery, k is the correction coefficient, and in a rectangular coordinate system consisting of the center of the central optical zone (10) as the zero point, the horizontal direction as the X axis, and the vertical direction as the Y axis, the line connecting the projection of the first point on the rectangular coordinate system and the zero point is the second line, θ is the angle from the positive direction of the X axis to the second line, and the first line is parallel to the axis of the central optical zone (10); The positions of the landing areas (13) corresponding to the two ends of the user's astigmatism axis are more forward than other positions, and the positions of the landing areas (13) corresponding to the two ends perpendicular to the direction of the astigmatism axis are more backward than other positions.

2. The scleral lens according to claim 1, wherein When θ is 0, π or 2π, and k≥0, the value range of the angle a is 15.00°-67.35°.

3. The scleral lens according to claim 1, wherein: When θ is π / 2 or 3π / 2 and k≥0, the value range of the angle a is 9.00°-61.35°.

4. The scleral lens according to claim 1, wherein: The correction coefficient k satisfies, -3≤k≤3.

5. The scleral lens according to claim 1, wherein: The diameter width d11 of the peripheral optical zone (11) has a value range of 10 mm to 17 mm.

6. The scleral lens according to any one of claims 1 to 5, wherein: The diameter width d10 of the central optical zone (10) is in the range of 5 mm to 15 mm, the vertical distance between the central optical zone (10) and the cornea (100) is configured to be in the range of 100 μm to 300 μm, and the space between the central optical zone (10) and the cornea (100) is filled with tear fluid.

7. The scleral lens according to any one of claims 1 to 5, wherein: The transition zone (12) is configured such that the vertical distance between the transition zone (12) and the corneal limbus (200) ranges from 50 μm to 100 μm, the diameter width d12 of the transition zone (12) ranges from 11.00 mm to 19.00 mm, and the surface shape of the transition zone (12) is an arc surface or a section surface.

8. The scleral lens according to any one of claims 1 to 5, wherein: The diameter width d13 of the landing area (13) has a value range of 15 mm to 20 mm, and the surface shape of the landing area (13) is a spherical surface or multiple connected spherical surfaces or a section surface.

9. The scleral lens according to any one of claims 1 to 5, wherein: The diameter width d14 of the peripheral zone (14) has a value range of 16 mm to 21 mm, and the surface shape of the peripheral zone (14) is a spherical surface or multiple connected spherical surfaces or a section surface.

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