A scleral lens

Abstract

The present invention discloses a scleral lens, comprising a lens body, wherein the lens body is continuously formed with an optical zone, a transition zone and a positioning zone from the center to the outside, and the connection between the cornea and the sclera is divided into a corneal part, a transition zone and a scleral part in sequence along the direction from the cornea to the sclera. The positioning zone is attached to the sclera for positioning the scleral lens, and the transition zone spans the upper part of the cornea and the sclera, so that the optical zone is arranged at the front end of the cornea and provides vision correction for the eye. The transition zone is arranged as any one of a one-segment arc structure, a two-segment arc structure or a three-segment arc structure according to different shapes of the corneal part, the transition part and the scleral part, and can be differentiated and designed according to different shapes of the corneal part, the transition part and the scleral part to improve wearing comfort.

Description

Technical Field

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

[0002] Like many lenses, scleral lenses are used to correct vision problems, but the difference from other contact lenses is that scleral lenses can also be used to protect the cornea and have certain therapeutic effects.

[0003] The scleral lens is in direct contact with the insensitive cornea, and its edge falls on the less sensitive white of the eye, which is also called the sclera. There is no direct contact between the scleral lens and the cornea, and a layer of liquid that can protect the cornea is retained between the two, which can be used to help the cornea heal and repair.

[0004] The connecting area between the cornea and the sclera is divided into the corneal part, the transition part and the scleral part in the direction from the cornea to the sclera.

[0005] The vision correction effect provided by scleral lenses is similar to that of other types of hard contact lenses, but they are more comfortable and can be worn in harsh environments such as dusty, windy, and dry.

[0006] The scleral lenses in the prior art lack detailed design of the transition zone, cannot be adaptively designed according to different eyeball shapes, and have poor wearing comfort. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a scleral lens, which can be designed according to the different shapes of the cornea part, the transition part and the sclera part to improve the wearing comfort.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A scleral lens comprises a lens body, wherein the lens body is continuously formed with an optical zone, a transition zone and a positioning zone from the center to the outside, and the connection area between the cornea and the sclera is divided into a corneal part, a transition part and a scleral part in sequence along the direction from the cornea to the sclera. The positioning zone is attached to the sclera and is used to position the scleral lens. The transition zone spans the upper part of the cornea and the sclera, so that the optical zone is arranged at the front end of the cornea and provides vision correction for the eye. The transition zone is arranged as any one of a one-arc structure, a two-arc structure or a three-arc structure according to the different shapes of the corneal part, the transition part and the scleral part.

[0010] Furthermore, the diameter DIA of the end of the transition zone is BFC =9mm~13mm.

[0011] Further, when the cornea portion, the transition portion and the sclera portion are all convex, or when the cornea portion and the transition portion are convex and the sclera portion is a cut surface, the transition zone is an arc structure, and the arc structure includes a first arc line, and the curvature radius R of the starting end of the first arc line is BFC1 =R 1 , where R 1 It is the radius of curvature of the cornea at the position corresponding to the starting end of the first arc.

[0012] Furthermore, the diameter DIA of the end of the first arc is BFC1 =9mm~13mm.

[0013] Furthermore, when the cornea and the sclera are convex and the transition portion is a cut surface, the transition zone is a two-arc structure; the two-arc structure includes a second arc and a third arc formed continuously from the center to the outside, the starting end of the second arc corresponds to the cornea, the starting end of the third arc corresponds to the sclera, and the curvature radius R of the starting end of the second arc is BFC2 =R 2 , where R 2 is the curvature radius of the cornea at the position corresponding to the starting end of the second arc; the curvature radius R of the starting end of the third arc BFC3 =R 3 , where R 3 It is the radius of curvature of the sclera at the position corresponding to the starting end of the third arc.

[0014] Furthermore, when the cornea portion is a convex surface and the transition portion and the sclera portion are cut surfaces, the transition zone is a two-segment arc structure; the two-segment arc structure includes a second arc and a third arc formed continuously from the center to the outside, the starting end of the second arc and the starting end of the third arc both correspond to the cornea, and the curvature radius R of the starting end of the second arc is BFC2 =R 2 , where R 2 is the curvature radius of the cornea at the position corresponding to the starting end of the second arc; the curvature radius R of the starting end of the third arc BFC3 =R 3 , where R 3 It is the radius of curvature of the cornea at the position corresponding to the starting end of the third arc.

[0015] Furthermore, the diameter DIA of the end of the second arc is BFC2 =9mm~11.5mm; the diameter DIA of the end of the third arc BFC3 =9.5mm~13mm, and DIA BFC3 >DIA BFC2 .

[0016] Furthermore, when the cornea is convex, the transition portion is a cut surface, and the sclera is concave, the transition zone is a three-arc structure, and the three-arc structure includes a fourth arc, a fifth arc, and a sixth arc that are continuously formed from the center to the outside, the starting end of the fourth arc and the starting end of the fifth arc both correspond to the position of the cornea, the starting end of the sixth arc corresponds to the position of the sclera, and the curvature radius R of the starting end of the fourth arc is BFC4 =R 4 , where R 4 is the curvature radius of the cornea at the position corresponding to the starting end of the fourth arc; the curvature radius R of the starting end of the fifth arc BFC5 =R 5 , where R 5 is the curvature radius of the cornea at the position corresponding to the starting end of the fifth arc; the curvature radius R of the starting end of the sixth arc BFC6 =R 6 , where R 6 It is the radius of curvature of the sclera at the position corresponding to the starting end of the sixth arc.

[0017] Furthermore, the diameter DIA of the end of the fourth arc is BFC4 =9mm~10mm; the diameter DIA of the end of the fifth arc BFC5 =9.5mm~11.5mm; the diameter DIA of the end of the sixth arc BFC6 =10mm~13mm, and DIA BFC6 >DIA BFC5 >DIA BFC4 .

[0018] Furthermore, the radius of curvature R at the center of the inner surface of the optical zone is BBC =R corneal-oz , where R corneal-oz is the radius of curvature at the center of the cornea, the diameter of the end of the optical zone oz = 5mm to 9mm; the radius of curvature R at the starting end of the positioning zone BAC =R scleral-AC , where R scleral-AC is the radius of curvature of the sclera at the position corresponding to the starting end of the positioning area, and the diameter DIA of the end of the positioning area BAC =12mm~17mm.

[0019] Compared with the prior art, the beneficial technical effects of the present invention are:

[0020] 1. The present invention can be designed according to the different shapes of the cornea part, the transition part and the sclera part to improve wearing comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the optical zone, transition zone and positioning zone of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure when the cornea part, the transition part and the sclera part of the present invention are all convex;

[0023] Figure 3 It is a schematic diagram of the structure of the present invention when the cornea part and the transition part are convex and the sclera part is a cut surface;

[0024] Figure 4 It is a schematic diagram of the structure of the present invention when the cornea part and the sclera part are convex and the transition part is a cut surface;

[0025] Figure 5 It is a schematic diagram of the structure of the present invention when the cornea part is a convex surface and the transition part and the sclera part are cut surfaces;

[0026] Figure 6 It is a schematic diagram of the structure of the present invention when the cornea part is a convex surface, the transition part is a cut surface, and the sclera part is a concave surface;

[0027] Figure 7 It is a structural schematic diagram of the sagitta of the optical zone, the sagitta of the transition zone and the sagitta of the positioning zone of the present invention. DETAILED DESCRIPTION

[0028] A preferred embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0029] like Figure 1-7 As shown, a scleral lens includes a lens body, wherein the lens body is continuously formed with an optical zone 1, a transition zone 2 and a positioning zone 3 from the center to the outside, and the connection area 20 between the cornea 10 and the sclera 30 is divided into a corneal part 21, a transition part 22 and a scleral part 33 in the direction from the cornea to the sclera. The positioning zone 3 is attached to the sclera and is used to position the scleral lens. The transition zone spans the upper part of the cornea and the sclera, so that the optical zone is arranged at the front end of the cornea 10 and provides vision correction for the eye. The transition zone 2 is arranged as any one of a one-arc structure, a two-arc structure or a three-arc structure according to the different shapes of the corneal part 21, the transition part 22 and the scleral part 23.

[0030] The diameter DIA of the end of the transition zone 2 is BFC =9mm~13mm.

[0031] like Figure 2 and 3As shown, when the cornea portion 21, the transition portion 22 and the sclera portion 23 are all convex, or when the cornea portion 21, the transition portion 22 are convex and the sclera portion 23 is a cut surface, the transition zone 2 is an arc structure, and the arc structure includes a first arc line, and the curvature radius R of the starting end of the first arc line BFC1 =R 1 , where R 1 is the radius of curvature of the cornea 10 at a position corresponding to the starting end of the first arc.

[0032] The diameter DIA of the end of the first arc BFC1 =9mm~13mm.

[0033] The first arc of Yagao sag BFC1 Take the sagittal height at the position on the sclera corresponding to the end of the first arc.

[0034] Due to the first arc's sag BFC1 Satisfies the following equation:

[0035]

[0036] The eccentricity of the first arc can be obtained as e BFC1 for:

[0037]

[0038] ; Among them, DIA BFC1 is the diameter of the end of the first arc, R BFC1 is the radius of curvature of the first arc, oz is the diameter of the end of the optical zone, sag lens-oz is the sagittal height of the optical zone.

[0039] The sag, also known as the sag, is the vertical distance between the geometric center of the rear surface of the lens and the lens diameter plane. Keeping the lens diameter unchanged and making the lens flat can reduce the sag, and vice versa, it can increase the sag.

[0040] There are two corresponding situations when the transition zone is a two-arc structure.

[0041] like Figure 4 As shown, when the cornea portion 21 and the sclera portion 23 are convex and the transition portion 22 is a cut surface, the transition zone 2 is a two-segment arc structure; the two-segment arc structure includes a second arc and a third arc continuously formed from the center to the outside, the starting end of the second arc corresponds to the cornea, the starting end of the third arc corresponds to the sclera, and the curvature radius R of the starting end of the second arc BFC2 =R 2 , where R 2 is the curvature radius of the position on the cornea 10 corresponding to the starting end of the second arc; the curvature radius R of the starting end of the third arcBFC3 =R 3 , where R 3 is the radius of curvature of the position on the sclera 30 corresponding to the starting end of the third arc.

[0042] like Figure 5 As shown, when the corneal portion 21 is a convex surface and the transition portion 22 and the scleral portion 23 are cut surfaces, the transition zone 2 is a two-segment arc structure; the two-segment arc structure includes a second arc and a third arc continuously formed from the center to the outside, the starting end of the second arc and the starting end of the third arc both correspond to the cornea, and the curvature radius R of the starting end of the second arc BFC2 =R 2 , where R 2 is the curvature radius of the position on the cornea 10 corresponding to the starting end of the second arc; the curvature radius R of the starting end of the third arc BFC3 =R 3 , where R 3 is the radius of curvature of the cornea 10 at a position corresponding to the starting end of the third arc.

[0043] The diameter DIA of the end of the second arc BFC2 =9mm~11.5mm; the diameter DIA of the end of the third arc BFC3 =9.5mm~13mm, and DIA BFC3 >DIA BFC2 .

[0044] Due to the second arc's sag BFC2 Satisfies the following equation:

[0045]

[0046] The eccentricity of the second arc is obtained as BFC2 for:

[0047]

[0048] Due to the sag of the third arc BFC3 Satisfies the following equation:

[0049]

[0050] The eccentricity of the third arc is obtained as e BFC3 for:

[0051]

[0052] Where oz is the diameter of the end of the optical zone; sag is the height of the second arc BFC2 = equal to the sagittal height of the eyeball corresponding to the end of the second arc; the sag of the second arcBFC3 It is equal to the sagittal height at the position on the eyeball corresponding to the end of the third arc.

[0053] like Figure 6 As shown, when the corneal portion 21 is a convex surface, the transition portion 22 is a cut surface, and the scleral portion 23 is a concave surface, the transition zone 2 is a three-segment arc structure, and the three-segment arc structure includes a fourth arc line, a fifth arc line, and a sixth arc line that are continuously formed from the center to the outside. The starting end of the fourth arc line and the starting end of the fifth arc line both correspond to the position of the cornea, the starting end of the sixth arc line corresponds to the position of the sclera, and the curvature radius R of the starting end of the fourth arc line BFC4 =R 4 , where R 4 is the curvature radius of the position on the cornea 10 corresponding to the starting end of the fourth arc; the curvature radius R of the starting end of the fifth arc BFC5 =R 5 , where R 5 is the curvature radius of the position on the cornea 10 corresponding to the starting end of the fifth arc; the curvature radius R of the starting end of the sixth arc BFC6 =R 6 , where R 6 is the radius of curvature of the position on the sclera 30 corresponding to the starting end of the sixth arc.

[0054] The diameter DIA of the end of the fourth arc BFC4 =9mm~10mm; the diameter DIA of the end of the fifth arc BFC5 =9.5mm~11.5mm; the diameter DIA of the end of the sixth arc BFC6 =10mm~13mm, and DIA BFC6 >DIA BFC5 >DIA BFC4 .

[0055] The method for calculating the eccentricity of the fourth arc, the fifth arc, and the sixth arc is the same as above.

[0056] like Figure 1 As shown, the radius of curvature R at the center of the inner surface of the optical zone 1 BBC =R corneal-oz , where R corneal - oz is the radius of curvature at the center of the cornea 10, and the diameter oz at the rear end of the optical zone is 5 mm to 9 mm.

[0057] There is a linear relationship between the diameter of the end of the optical zone and the diameter of the pupil, oz = oz 0 +1mm, of which oz 0 is the diameter of the pupil;

[0058] The cornea has a corneal optical zone, and the sag height of the corneal optical zone is sag corneal-oz .

[0059] The sag of the optical zone of the scleral lens lens-oz =sag corneal-oz .

[0060] The inner surface of the optical zone is concave, and its eccentricity e BBC for:

[0061]

[0062] Where oz is the diameter of the end of the optical zone, R BBC is the radius of curvature of the inner surface of the optical zone.

[0063] The outer surface of the optical zone is convex. When designing the convex surface of the optical zone, it is necessary to consider the patient's myopia or hyperopia refraction PW that needs to be corrected, the material refractive index n, and the center thickness t of the scleral lens. From this, the curvature radius R of the convex surface of the scleral lens optical zone can be calculated. FBC :

[0064]

[0065] The central thickness t of the scleral lens ranges from 0.04 mm to 0.60 mm.

[0066] The sagittal height and curvature radius of each part of the cornea and sclera can be obtained from the corneal topography of the measuring equipment. The refractive index n of the material, the refractive power PW of the patient's myopia or hyperopia that needs to be corrected, and the center thickness t of the scleral lens are known quantities.

[0067] like Figure 1 As shown, the curvature radius R of the starting end of the positioning area 3 BAC =R scleral-AC , where R scleral-AC is the radius of curvature of the sclera 30 at the position corresponding to the starting end of the positioning area, and the diameter DIA of the end of the positioning area is BAC =12mm~17mm.

[0068] In order to solve the eccentricity e of the positioning area BAC , it is necessary to determine the sag of the transition zone BFC , if the transition zone is an arc structure, sag BFC＝ sag BFC1 ; If the transition zone is a two-arc structure: sag BFC =sag BFC2 +sag BFC3 ; If the transition zone is a three-arc structure: sag BFC =sag BFC4+sag BFC5 +sag BFC6 .

[0069] Due to the sag of the positioning area BAC Satisfies the following equation:

[0070]

[0071] The eccentricity e of the localization area can be obtained BAC for:

[0072]

[0073] ; Among them, the sag of the positioning area BAC =sag scleral-AC , sag scleral-AC It is the sagittal height at the position on the sclera corresponding to the end of the positioning area.

[0074] In the present invention, the optical zone, positioning zone, transition zone, first arc, second arc, third arc, fourth arc, fifth arc and sixth arc are all conic sections, and their shapes can be uniquely determined according to the curvature radius of their respective starting ends and their respective eccentricities.

[0075] In the present invention, the optical zone, the positioning zone, the transition zone, the first arc, the second arc, the third arc, the fourth arc, the fifth arc, and the sixth arc each have a circular structure at their end.

[0076] In the present invention, the sagittal height of each part of the cornea and sclera and the radius of curvature of each part of the cornea and sclera can be obtained from the corneal topography of the measuring device.

[0077] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0078] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A scleral lens, comprising a lens body, wherein the lens body is continuously formed with an optical zone (1), a transition zone (2) and a positioning zone (3) from the center outward, and a connecting area (20) between the cornea (10) and the sclera (30) is sequentially divided into a corneal part (21), a transition part (22) and a scleral part (23) along the direction from the cornea to the sclera, characterized in that: The positioning zone (3) is attached to the sclera and is used to position the scleral lens. The transition zone spans the upper part of the cornea and the sclera, so that the optical zone is arranged at the front end of the cornea (10) and provides vision correction for the eye. The transition zone (2) is arranged to be any one of a one-segment arc structure, a two-segment arc structure or a three-segment arc structure according to the different shapes of the corneal part (21), the transition part (22) and the scleral part (23); When the corneal portion (21), the transition portion (22) and the scleral portion (23) are all convex surfaces, or when the corneal portion (21) and the transition portion (22) are convex surfaces and the scleral portion (23) is a cut surface, the transition zone (2) is an arc structure, and the arc structure includes a first arc line, and the curvature radius R of the starting end of the first arc line is BFC1 =R1, wherein R1 is the radius of curvature of the cornea (10) at a position corresponding to the starting end of the first arc; The optical zone, the positioning zone, the transition zone and the first arc are all conic sections.

2. The scleral lens according to claim 1, characterized in that: The diameter DIA of the end of the transition zone (2) BFC =9mm~13mm.

3. The scleral lens according to claim 1, characterized in that: The diameter DIA of the end of the first arc BFC1 =9mm~13mm.

4. The scleral lens according to claim 1, characterized in that: When the corneal portion (21) and the scleral portion (23) are convex surfaces and the transition portion (22) is a cut surface, the transition zone (2) is a two-segment arc structure; the two-segment arc structure includes a second arc and a third arc that are continuously formed from the center to the outside, the starting end of the second arc corresponds to the cornea, the starting end of the third arc corresponds to the sclera, and the curvature radius R of the starting end of the second arc BFC2 = R2, wherein R2 is the curvature radius of the cornea (10) at a position corresponding to the starting end of the second arc; the curvature radius R of the starting end of the third arc is BFC3 =R3, wherein R3 is the radius of curvature of the sclera (30) at a position corresponding to the starting end of the third arc.

5. The scleral lens according to claim 1, characterized in that: When the corneal portion (21) is a convex surface and the transition portion (22) and the scleral portion (23) are cut surfaces, the transition zone (2) is a two-segment arc structure; the two-segment arc structure includes a second arc and a third arc that are continuously formed from the center to the outside, the starting end of the second arc and the starting end of the third arc both correspond to the cornea, and the curvature radius R of the starting end of the second arc BFC2 = R2, wherein R2 is the curvature radius of the cornea (10) at a position corresponding to the starting end of the second arc; the curvature radius R of the starting end of the third arc is BFC3 =R3, wherein R3 is the radius of curvature of the cornea (10) at a position corresponding to the starting end of the third arc.

6. The scleral lens according to claim 4 or 5, characterized in that: The diameter DIA of the end of the second arc BFC2 =9mm~11.5mm; the diameter DIA of the end of the third arc BFC3 =9.5mm~13mm, and DIA BFC3 >DIA BFC2 .

7. The scleral lens according to claim 1, characterized in that: When the corneal portion (21) is a convex surface, the transition portion (22) is a cut surface, and the scleral portion (23) is a concave surface, the transition zone (2) is a three-arc structure, and the three-arc structure includes a fourth arc, a fifth arc, and a sixth arc that are continuously formed from the center to the outside, the starting end of the fourth arc and the starting end of the fifth arc both correspond to the position of the cornea, the starting end of the sixth arc corresponds to the position of the sclera, and the curvature radius R of the starting end of the fourth arc BFC4 = R4, wherein R4 is the curvature radius of the cornea (10) at a position corresponding to the starting end of the fourth arc; the curvature radius R of the starting end of the fifth arc is BFC5 = R5, wherein R5 is the curvature radius of the cornea (10) at a position corresponding to the starting end of the fifth arc; the curvature radius R of the starting end of the sixth arc is BFC6 =R6, wherein R6 is the radius of curvature of the sclera (30) at a position corresponding to the starting end of the sixth arc.

8. The scleral lens according to claim 7, characterized in that: The diameter DIA of the end of the fourth arc BFC4 =9mm~10mm; the diameter DIA of the end of the fifth arc BFC5 =9.5mm~11.5mm; the diameter DIA of the end of the sixth arc BFC6 =10mm~13mm, and DIA BFC6 >DIA BFC5 >DIA BFC4 .

9. The scleral lens according to claim 1, characterized in that: The radius of curvature R at the center of the inner surface of the optical zone (1) BBC =R corneal-oz , where R corneal-oz is the radius of curvature at the center of the cornea (10), the diameter oz of the end of the optical zone is 5 mm to 9 mm; the radius of curvature R of the starting end of the positioning zone (3) is BAC =R scleral-AC , where R scleral-AC is the radius of curvature of the position on the sclera (30) corresponding to the starting end of the positioning area, and the diameter DIA of the end end of the positioning area BAC =12mm~17mm.

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