Rigid gas permeable contact lens for myopia prevention and control

Abstract

The present application belongs to the field of eye optometry technology, and discloses a hard gas-permeable corneal contact lens for myopia prevention and control. The hard gas-permeable corneal contact lens for myopia prevention and control comprises a lens body, a central optical zone, a defocus zone, a defocus stabilization zone and a front surface peripheral zone are sequentially and concentrically arranged on the front surface of the lens body from the center to the edge, a base curve zone, a positioning zone and a rear surface peripheral zone are sequentially and concentrically arranged on the rear surface of the lens body from the center to the edge, the positioning zone comprises a plurality of interconnected sub-positioning zones, the longitudinal section shape of the positioning surface of the sub-positioning zone is linear, and the rear surface peripheral zone comprises at least two interconnected sub-peripheral zones. The hard gas-permeable corneal contact lens for myopia prevention and control provided by the present application can be adjusted according to actual needs to improve the fitting degree of the hard gas-permeable corneal contact lens for myopia prevention and control and the cornea, so that the positioning is more accurate.

Description

Technical Field

[0001] The present invention relates to the field of ophthalmic technology, and in particular to a rigid gas permeable corneal contact lens for preventing and controlling myopia. Background Art

[0002] In the prior art, methods suitable for controlling myopia in adolescents include: behavioral intervention, optical intervention, and drug intervention, etc. Optical intervention methods are mostly based on the defocus design of peripheral myopia, and commonly used ones are orthokeratology lenses and defocus soft lenses. Orthokeratology is a method of delaying the development of myopia in adolescents, and its effectiveness has been confirmed by many literatures. However, orthokeratology lenses have relatively many requirements on the patient's myopia degree and corneal morphology, which limits the scope of its indications; defocus soft lenses are limited by the oxygen permeability of the materials used, and after long-term wearing, the surface of the eyeball sometimes becomes dry. In addition, the existing defocus RGP (Rigid Gas Permeable Contact Lens, hard gas permeable corneal contact lens) has poor positioning when worn on the eyeball, and the foreign body sensation caused by sliding prolongs the patient's adaptation period. Summary of the Invention

[0003] The purpose of the present invention is to provide a rigid gas permeable corneal contact lens for myopia prevention and control, aiming to improve the adaptability to the cornea, make positioning more accurate, and improve wearing comfort.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] Rigid gas permeable contact lenses for myopia prevention and control, including:

[0006] A lens body, wherein the front surface of the lens body is concentrically provided with a central optical zone, a defocus zone, a defocus stabilization zone and a front surface peripheral zone from the center to the edge, and the back surface of the lens body is concentrically provided with a base curve zone, a positioning zone and a back surface peripheral zone from the center to the edge, the positioning zone includes at least two mutually connected sub-positioning zones, the longitudinal cross-section of the positioning surface of the sub-positioning zone is a straight line, and the back surface peripheral zone includes at least two mutually connected sub-peripheral zones.

[0007] Optionally, the diameter width FOZD1 of the central optical zone is 2mm-4mm.

[0008] Optionally, the defocusing region includes a plurality of separated focus regions connected to each other.

[0009] Optionally, the number of the separated focus zones is four, and the four separated focus zones are respectively a first defocus zone, a second defocus zone, a third defocus zone and a fourth defocus zone connected to each other, the edge of the first defocus zone away from the second defocus zone is connected to the central optical zone, and the edge of the fourth defocus zone away from the third defocus zone is connected to the defocus stability zone.

[0010] Optionally, the diameter width of the defocus zone (FOZD5 / 2-FOZD1 / 2) is 0.5mm-2mm;

[0011] The diameter width of the defocus stable zone (FOZD6 / 2-FOZD5 / 2) is 1mm-2.5mm;

[0012] The diameter width (FPD / 2-FOZD6 / 2) of the front surface peripheral area is 2mm-7mm.

[0013] Optionally, the vertex curvature radius of the base curve area is 5.55mm-7.15mm;

[0014] The base arc zone width (BOZD) is 5 mm to 7 mm.

[0015] Optionally, the positioning area includes three interconnected sub-positioning areas, which are respectively a first positioning area, a second positioning area and a third positioning area. The first positioning area is connected to the base arc area away from the edge of the second positioning area, and the third positioning area is connected to the rear surface peripheral area away from the edge of the second positioning area.

[0016] Optionally, the diameter width (BPD1 / 2-BOZD / 2) of the first positioning zone is 0.3mm-0.7mm;

[0017] The diameter width (BPD2 / 2-BPD1 / 2) of the second positioning area is 0.3mm-0.7mm;

[0018] The diameter width (BPD3 / 2-BPD2 / 2) of the third positioning area is 0.5mm-1.1mm.

[0019] Optionally, the rear surface peripheral area includes two interconnected sub-peripheral areas, the two sub-peripheral areas are a first peripheral area and a second peripheral area, and the first peripheral area is connected to the positioning area away from an edge of the second peripheral area.

[0020] Optionally, the diameter width (BPD4 / 2-BPD3 / 2) of the first peripheral zone is 0.2mm-0.25mm;

[0021] The diameter width (BPD5 / 2-BPD4 / 2) of the second peripheral area is 0.2mm-0.25mm.

[0022] Beneficial effects of the present invention: The hard breathable corneal contact lens for myopia prevention and control provided by the present invention has a positioning area including multiple interconnected sub-positioning areas, and the longitudinal cross-sectional shape of the positioning surface of the sub-positioning area is a straight line. The connection between the lines is flatter than the arc-to-arc connection in the prior art, which reduces the mechanical friction of the hard breathable corneal contact lens for myopia prevention and control on the corneal surface, can effectively prevent the human eye from sliding the lens when blinking, causing visual quality problems, and avoids damage to the cornea caused by long-term wearing. In order to adapt to the complex corneal surface, the inclination angle of each sub-positioning area can also be adjusted according to actual needs to improve the compatibility of the hard breathable corneal contact lens for myopia prevention and control with the cornea, so as to make the positioning more accurate; the peripheral area of ​​the back surface includes at least two interconnected sub-peripheral areas to ensure a gradual flat change from the inside to the outside, reduce the pressure on the corneal surface during tear exchange, and improve the comfort of wearing the glasses. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of a rigid gas permeable contact lens for myopia prevention and control provided by an embodiment of the present invention after being worn on the cornea;

[0024] Figure 2 This is a defocused optical path diagram formed after wearing the rigid gas permeable corneal contact lens for myopia prevention and control provided by an embodiment of the present invention;

[0025] Figure 3 is a schematic structural diagram of the front surface of a lens body provided by an embodiment of the present invention;

[0026] Figure 4 is a diagram showing the difference in luminosity between the defocused area and the central optical area provided by an embodiment of the present invention;

[0027] Figure 5 is a schematic structural diagram of the rear surface of a lens body provided by an embodiment of the present invention;

[0028] Figure 6 It is a longitudinal cross-sectional view of the positioning surface of the positioning area provided by the prior art and the embodiment of the present invention.

[0029] In the picture:

[0030] 100, lens body;

[0031] 110, front surface; 111, central optical zone; 112, defocus zone; 1121, first defocus zone; 1122, second defocus zone; 1123, third defocus zone; 1124, fourth defocus zone; 113, defocus stabilization zone; 114, peripheral zone of the front surface;

[0032] 120, rear surface; 121, base curve area; 122, positioning area; 1221, first positioning area; 1222, second positioning area; 1223, third positioning area; 123, rear surface peripheral area; 1231, first peripheral area; 1232, second peripheral area;

[0033] 200, cornea; 300, retina; 400, imaging surface; 500, macular area. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate 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 illustrate portions relevant to the present invention, not all structures.

[0035] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections 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 in specific circumstances.

[0036] 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.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0038] This embodiment provides a rigid gas permeable corneal contact lens for myopia prevention and control. The lens body of the rigid gas permeable corneal contact lens for myopia prevention and control is made of a rigid material with high oxygen permeability, which not only improves the oxygen permeability but also ensures the firmness of the material. At the same time, the rigid gas permeable corneal contact lens for myopia prevention and control is combined with a peripheral defocus design, so that after light passes through the lens body and the eyeball, myopic defocus is formed at the periphery of the retina.

[0039] Specifically, if Figure 1-Figure 3 and Figure 5 As shown, the rigid gas permeable corneal contact lens for myopia prevention and control includes a lens body 100, and the front surface 110 of the lens body 100 is concentrically provided with a central optical zone 111, a defocus zone 112, a defocus stabilization zone 113 and a front surface peripheral zone 114 from the center to the edge, and the back surface 120 of the lens body 100 is concentrically provided with a base curve zone 121, a positioning zone 122 and a back surface peripheral zone 123 from the center to the edge, the positioning zone 122 includes a plurality of interconnected sub-positioning zones, the longitudinal cross-section of the positioning surface of the sub-positioning zone is a straight line, and the back surface peripheral zone 123 includes at least two interconnected sub-peripheral zones.

[0040] The hard breathable corneal contact lens for myopia prevention and control provided by the present invention has a positioning area 122 including multiple interconnected sub-positioning areas, and the longitudinal cross-sectional shape of the positioning surface of the sub-positioning area is a straight line. The connection between the lines is flatter than the arc-to-arc connection in the prior art, which reduces the mechanical friction of the hard breathable corneal contact lens for myopia prevention and control on the surface of the cornea 200, can effectively prevent the human eye from sliding the lens body 100 when blinking, causing visual quality problems, and avoid long-term wear causing damage to the cornea 200. In order to adapt to the complex surface of the cornea 200, the inclination angle of each sub-positioning area can also be adjusted according to actual needs to improve the compatibility of the hard breathable corneal contact lens for myopia prevention and control with the cornea 200 and make the positioning more accurate; the rear surface peripheral area 123 includes at least two interconnected sub-peripheral areas to ensure a gradual flat change from the inside to the outside, reduce the pressure on the surface of the cornea 200 during tear exchange, and improve the comfort of wearing the glasses.

[0041] See also Figure 3 , Figure 3 This is a schematic diagram of the front surface 110 of a lens body 100 according to an embodiment of the present invention. Optionally, the central optical zone 111 has a width FOZD1 of 2 mm to 4 mm. This ensures that external light passing through this area and the eyeball is imaged at a relatively central position on the retina 300, achieving clear vision. In this embodiment, the central optical zone 111 can be either spherical or aspherical. For high-power lens bodies 100, configuring the central optical zone 111 as an aspherical surface can have a certain effect on aberration correction.

[0042] In this embodiment, the defocus region 112 includes a plurality of interconnected separate focus regions. By providing a plurality of interconnected separate focus regions, the defocus intensity can be gradually increased. For example, the number of separate focus regions can be set to 1-11.

[0043] Furthermore, the number of defocus zones is preferably four, and the four defocus zones are respectively a first defocus zone 1121, a second defocus zone 1122, a third defocus zone 1123, and a fourth defocus zone 1124 that are connected to each other. The edge of the first defocus zone 1121 away from the second defocus zone 1122 is connected to the central optical zone 111, and the edge of the fourth defocus zone 1124 away from the third defocus zone 1123 is connected to the defocus stabilization zone 113. In other embodiments, the number of defocus zones may be set to other values, such as 3 or 11, as required.

[0044] Optionally, the diameter width (FOZD5 / 2-FOZD1 / 2) of the defocus zone 112 is 0.5mm-2mm; the diameter width (FOZD6 / 2-FOZD5 / 2) of the defocus stabilization zone 113 is 1mm-2.5mm, and the luminosity in this zone is equal everywhere to achieve a stable state of defocus luminosity; the diameter width (FPD / 2-FOZD6 / 2) of the front surface peripheral zone 114 is 2mm-7mm. Figure 2 The macula 500 is the most sensitive area of ​​vision, and the cones responsible for vision and color vision are distributed in this area. The luminosity of the peripheral area 114 of the front surface is greater than that of the central optical area 111, which will produce a peripheral defocus effect. Peripheral defocus can allow objects outside the central field of view to be projected onto the peripheral retina 300 or the front to form an imaging surface 400, which can reduce the occurrence of hyperopic defocus and achieve the effect of myopia prevention and control.

[0045] like Figure 4 As shown, Figure 4 : is a diagram of the difference in luminosity between the defocus zone 112 and the central optical zone 111 provided by an embodiment of the present invention. In the diagram, the value of ADD that is not equal to zero represents the difference between the luminosity of each separated focus zone and the luminosity of the central optical zone 111. The range of ADD is preferably 1D-6D, with a step size of 0.5D. Width represents the diameter width of the central optical zone 111, the first defocus zone 1121, the second defocus zone 1122, the third defocus zone 1123 and the fourth defocus zone 1124. Preferably, the diameter width of each separated focus zone is equal to the diameter width of the defocus zone 112 (FOZD5 / 2-FOZD1 / 2) divided by the number of separated focus zones.

[0046] See also Figure 5 , Figure 5: It is a structural schematic diagram of the back surface 120 of the lens body 100 provided in an embodiment of the present invention. Optionally, the vertex curvature radius of the base curve area 121 is 5.55mm-7.15mm; the diameter width (BOZD) of the base curve area 121 is 5mm-7mm, so as to leave enough design space for the positioning area 122. The base curve area 121 is also called the optical zone. When the rigid gas-permeable contact lens for myopia prevention and control is worn, a certain tear layer remains between the base curve area 121 and the front surface 110 of the cornea 200 to avoid the problem of corneal hypoxia or compression of the cornea 200 caused by long-term direct contact between the lens body 100 and the cornea 200. Exemplarily, the base curve area 121 can be set as a spherical surface or as an aspherical surface, which can be set according to actual needs.

[0047] Preferably, the positioning area 122 includes three interconnected sub-positioning areas, namely the first positioning area 1221, the second positioning area 1222 and the third positioning area 1223. The edge of the first positioning area 1221 away from the second positioning area 1222 is connected to the base arc area 121, and the edge of the third positioning area 1223 away from the second positioning area 1222 is connected to the rear surface peripheral area 123. Each sub-positioning area adopts a tangent-like structure design, such as Figure 6 As shown, Figure 6 : This is a longitudinal cross-sectional view of the positioning surface of the positioning area 122 provided by the prior art and the embodiment of the present invention, wherein the solid line is the shape of the longitudinal cross-section of the positioning surface of the positioning area 122 in the prior art, the dotted line is the shape of the longitudinal cross-section of the positioning surface of the positioning area 122 in this embodiment, θ1 is the angle between the first positioning surface of the first positioning area 1221 and the vertical line, θ2 is the angle between the second positioning surface of the second positioning area 1222 and the vertical line, and θ3 is the angle between the third positioning surface of the third positioning area 1223 and the vertical line. As can be seen from the figure, by making the longitudinal cross-sectional shape of the positioning surface of each sub-positioning area linear, the transition between each sub-positioning area can be made smoother, reducing mechanical friction with the cornea 200 and avoiding damage to the surface of the cornea 200 caused by long-term wear. In other embodiments, the number of sub-positioning areas can also be set to other numbers, such as 2 or 4, as needed.

[0048] Optionally, the diameter width (BPD1 / 2-BOZD / 2) of the first positioning area 1221 is 0.3mm-0.7mm; the diameter width (BPD2 / 2-BPD1 / 2) of the second positioning area 1222 is 0.3mm-0.7mm; and the diameter width (BPD3 / 2-BPD2 / 2) of the third positioning area 1223 is 0.5mm-1.1mm, so as to better adapt to the size of the cornea 200.

[0049] The rear surface peripheral zone 123 comprises two interconnected sub-peripheral zones, namely a first peripheral zone 1231 and a second peripheral zone 1232. The first peripheral zone 1231 is connected to the positioning zone 122 at an edge distal from the second peripheral zone 1232. The configuration of the rear surface peripheral zone 123 ensures good tear exchange after wearing the lens body 100, thereby maintaining a healthy cornea 200. By configuring the rear surface peripheral zone 123 as the first peripheral zone 1231 and the second peripheral zone 1232, the peripheral lift is smoother, ensuring good tear exchange. This also reduces pressure on the cornea 200 surface and improves wearing comfort. Optionally, the first peripheral zone 1231 and the second peripheral zone 1232 can be spherical or aspherical, such as with a tangent structure, as needed.

[0050] Preferably, the diameter width (BPD4 / 2-BPD3 / 2) of the first peripheral area 1231 is 0.2 mm-0.25 mm; the diameter width (BPD5 / 2-BPD4 / 2) of the second peripheral area 1232 is 0.2 mm-0.25 mm.

[0051] 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. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. 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 rigid gas permeable corneal contact lens for myopia prevention and control, characterized in that: include: A lens body (100), wherein the front surface (110) of the lens body (100) is concentrically provided with a central optical zone (111), a defocus zone (112), a defocus stabilization zone (113) and a front surface peripheral zone (114) from the center to the edge, and the back surface (120) of the lens body (100) is concentrically provided with a base curve zone (121), a positioning zone (122) and a back surface peripheral zone (123) from the center to the edge, wherein the positioning zone (122) includes at least two mutually connected sub-positioning zones, and the longitudinal cross-section of the positioning surface of the sub-positioning zone is a straight line, and the back surface peripheral zone (123) includes at least two mutually connected sub-peripheral zones; The rear surface peripheral area (123) includes two interconnected sub-peripheral areas, the two sub-peripheral areas being a first peripheral area (1231) and a second peripheral area (1232), the first peripheral area (1231) being connected to the positioning area (122) at an edge away from the second peripheral area (1232); The positioning area (122) includes three interconnected sub-positioning areas, and the three sub-positioning areas are respectively a first positioning area (1221), a second positioning area (1222) and a third positioning area (1223). The first positioning area (1221) is connected to the base arc area (121) away from the edge of the second positioning area (1222), and the third positioning area (1223) is connected to the rear surface peripheral area (123) away from the edge of the second positioning area (1222).

2. The rigid gas permeable contact lens for myopia prevention and control according to claim 1, characterized in that: The diameter width FOZD1 of the central optical zone (111) is 2mm-4mm.

3. The rigid gas permeable contact lens for myopia prevention and control according to claim 1, characterized in that: The defocusing region (112) includes a plurality of separated focus regions connected to each other.

4. The rigid gas permeable contact lens for myopia prevention and control according to claim 3, characterized in that: The number of the separated focus zones is four, and the four separated focus zones are respectively a first defocus zone (1121), a second defocus zone (1122), a third defocus zone (1123) and a fourth defocus zone (1124) which are connected to each other. The edge of the first defocus zone (1121) away from the second defocus zone (1122) is connected to the central optical zone (111), and the edge of the fourth defocus zone (1124) away from the third defocus zone (1123) is connected to the defocus stabilization zone (113).

5. The rigid gas permeable contact lens for myopia prevention and control according to claim 1, characterized in that: The diameter width (FOZD5 / 2-FOZD1 / 2) of the defocus zone (112) is 0.5 mm to 2 mm; The diameter width (FOZD6 / 2-FOZD5 / 2) of the defocus stabilization zone (113) is 1 mm to 2.5 mm; The diameter width (FPD / 2-FOZD6 / 2) of the front surface peripheral area (114) is 2mm-7mm.

6. The rigid gas permeable contact lens for myopia prevention and control according to claim 1, characterized in that: The vertex curvature radius of the base arc region (121) is 5.55 mm to 7.15 mm; The base arc zone (121) has a diameter width (BOZD) of 5 mm to 7 mm.

7. The rigid gas permeable contact lens for myopia prevention and control according to claim 1, characterized in that: The diameter width (BPD1 / 2-BOZD / 2) of the first positioning area (1221) is 0.3mm-0.7mm; The diameter width (BPD2 / 2-BPD1 / 2) of the second positioning area (1222) is 0.3mm-0.7mm; The diameter width (BPD3 / 2-BPD2 / 2) of the third positioning area (1223) is 0.5mm-1.1mm.

8. The rigid gas permeable contact lens for myopia prevention and control according to claim 1, characterized in that: The diameter width (BPD4 / 2-BPD3 / 2) of the first peripheral area (1231) is 0.2mm-0.25mm; The diameter width (BPD5 / 2-BPD4 / 2) of the second peripheral area (1232) is 0.2mm-0.25mm.

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