in the formula, z represents the rise difference in the z-axis direction, c represents the curvature, k represents the conic surface coefficient, Cj is xm, the coefficient of yn term, and m and n represent the orders of x and y, respectively.

The novel scleral lens, wherein the diameter of the transition area is d, d is 4mm, the single or multiple sections of the circular arcs with different curvature radii forming the inner surface of the transition area are defined as Pn, and the two side ends of the Pn are Pn_nAnd P_n+1Establishing a two-dimensional coordinate system XY in which the center of curvature of the cornea is the originThe coordinates of the two side end points of the clamping plane n are P_n(X_n,Y_n) And P_n+1(X_n+1,Y_n+1) End point P_nAnd P_n+1The angles with the curvature center of the cornea are respectively T_nAnd T_n+1The end point P of the power n can be obtained by measuring the corneal topography and correctly calculating the eyeball model_nAnd P_n+1Information P of_n(X_n,Y_n，T_n)，P_n+1(X_n+1,Y_n+1，T_n+1) Based on this, a single or multiple segments of circular arcs of different radii of curvature may be obtained, e.g. a preference n +1, a preference n +2, a preference n +3 …, with an end point P_n+1，P_n+2、P_n+2，P_n+3、P_n+3，P_n+4… with endpoint coordinate P_n+1(X_n+1,Y_n+1)，P_n+2(X_n+2,Y_n+2)、P_n+2(X_n+2,Y_n+2)，P_n+3(X_n+3,Y_n+3)、 P_n+3(X_n+3,Y_n+3)，P_n+4(X_n+4,Y_n+4) … and the angle of the end points to the center of curvature of the cornea is T_n+1，T_n+2、T_n+2，T_n+3、T_n+3，T_n+4…, the radii of curvature of the cutting rules, e, n +1, n +2, n +3, 3 … may satisfy the following relations:

based on the above formula, the end point of the preference n is substituted into the formula to obtain R_n' and R_n", take R_n' and R_n"to obtain a value R of the radius of curvature of the cutting element_nThe same may be obtained, e.g. the value R of the curvature radius of the cutting preference n +1, n +2, n +3 …_n+1、R_n+2、R_n+3…。

The novel scleral mirror is aspheric, the surface section of the inner surface of the transition area consists of three sections of circular arcs with different curvature radiuses, and the thickness between the inner surface of the transition area and the outer surface of the transition area is 0.3-0.5 mm.

The new scleral mirror as described above, wherein three segments of arcs of different radii of curvature constituting the inner surface of the transition region may be defined as the preference 1, thepreference 2 and thepreference 3, the two side ends of the preference 1, thepreference 2 and thepreference 3 being respectively P1, P2, P2, P3 and P3, P4; establishing a two-dimensional coordinate system XY with the center of curvature of the cornea as the origin, in which two-sided end point coordinates of the cutting tool 1 are P1(X1, Y1) and P2(X2, Y2), two-sided end point coordinates of thecutting tool 2 are P2(X2, Y2) and P3(X3, Y3), two-sided end point coordinates of thecutting tool 3 are P3(X3, Y3) and P4(X4, Y4), and angles of the end points P1, P2, P3 and P4 with the center of curvature of the cornea are T respectively₁、T₂、T₃And T₄The information P of the end points P1, P2, P2, P3, P3 and P4 of the

cutting preference

1, 2 and 3 can be obtained by measuring the topography of the cornea and correctly estimating the eyeball model₁(X₁,Y₁，T₁)，P₂(X₂,Y₂，T₂)、P₂(X₂,Y₂，T₂)，P₃(X₃,Y₃，T₃) And P₃(X₃,Y₃，T₃)，P₄(X₄,Y₄，T₄) The radii of curvature for the cutting edges, e.g. 1, 2 and 3, satisfy the following relations:

based on the above formula, the end points of the preference 1 are substituted into the formula to obtain R₁' and R₁", take R₁' and R₁"to obtain a value R of the curvature radius of the cutting insert 1₁The values of the curvature radius R for the

cutting rules

2 and 3₂And R₃。

The novel scleral mirror described above is characterized in that the section of the inner surface of the landing zone is aspheric and is composed of three arcs with different curvature radii, the angle of inclination α is 3-5 °, the diameter of the landing zone is w, w is 8mm, the thickness of the landing zone is 0.25-0.35 mm, and the three arcs with different curvature radii for composing the inner surface of the landing zone can be defined as [ i ], [ ii ] and [ iii ], based on the formula:

obtaining values of curvature radius R for the preference i, ii and iii_i、R_iiAnd R_iii。

The novel scleral mirror is characterized in that the thickness range of the tear storage interval is 0-300 um.

The novel scleral mirror is characterized in that the diameter of the novel scleral mirror is D, the D is 20-24 mm, and the novel scleral mirror is made of a high oxygen permeability material with a Dk value larger than 120.

The invention has the beneficial effects that:

Drawings

FIG. 1 is a cross-sectional view of the present invention.

Fig. 2 is a schematic diagram of the relationship between the inner surface end points of the scleral mirror in a two-dimensional coordinate system (the surface-shaped cross section of the inner surface of the transition region is a single arc).

The reference numbers illustrate: 1. an outer surface; 2. an outer surface of the optical zone; 3. an outer surface of the transition zone; 4. A landing zone outer surface; 5. an inner surface; 6. an inner surface of the optical zone; 7. an inner surface of the transition zone; 8. an inner landing zone surface; 9. an optical zone; 10. a transition zone; 11. a landing zone; 12. a cornea; 13. the radius of the corneal curvature; 14. the radius of the inner surface of the optical zone; 15. the radius of the comprehensive curved surface on the inner surface of the transition area; 16. the comprehensive curved surface radius of the inner surface of the landing zone; 17. tear storage intervals.

Detailed Description

In order to make the technical solution of the present invention clearer and clearer, the present invention is further described below with reference to embodiments, and any solution obtained by substituting technical features of the technical solution of the present invention with equivalents and performing conventional reasoning falls within the scope of the present invention.

Example one

the inner surface of the optical zone and the outer surface of the optical zone are the same in surface type and are both free-form surfaces, tear storage intervals are reserved between the inner surface of the optical zone and a cornea and used for storing tears, the inner surface of the transition zone is aspheric and is positioned between the inner surface of the optical zone and the inner surface of the landing zone, the surface type section of the transition zone is formed by connecting single-segment or multiple-segment circular arcs with different curvature radiuses, the inner surface of the landing zone is aspheric, the surface type section of the landing zone is formed by connecting single-segment or multiple-segment circular arcs with different curvature radiuses, the inner surface of the landing zone and the surface of a sclera form an inclination angle in a tangential direction, and the inclination;

in this embodiment, surface and optics district surface adopt the free-form surface design, can effectively rectify the high order aberration, improve the imaging quality, and the tear interval of storing up of reservation can store the tear, and the cornea does not have the foreign-body sensation, and the comfort level is high, and landing zone forms the stick up limit, can effectively improve the stability of scleral mirror, wears more comfortablely.

Example two

The novel scleral mirror of the present embodiment, wherein the optical area has a thickness D, a diameter D of 0.25-0.4 mm, and a thickness D₀，D₀The optical zone is 8-12 mm, the curvature radius is 7.55-9.91 mm, and the free-form surface expressions of the outer surface of the optical zone and the inner surface of the optical zone are as follows:

in the formula, z represents the rise difference of the vector in the z-axis direction, c represents the curvature, k represents the coefficient of a conical surface, Cj is xm, the coefficient of yn terms, and m and n represent the orders of x and y respectively;

the free-form surface type of the present embodiment is established based on the above-mentioned free-form surface expression, and mathematical modeling is performed according to data of a cornea measured by a corneal topography, so that the cornea can be used as an optical surface with an aspheric surface, the outer surface of the novel scleral mirror is used as a first surface, the inner surface optical zone is used as a second surface, the cornea is used as a third surface, and the retina of a human eye is used as an imaging surface, and the relative position relationship, the refractive index and the like of the cornea and the cornea are input, and the simulated parameters of the cornea and the cornea are input into optical design software code.v to design an optical system and perform item-by-item optimization, and the obtained free-form surface type of the scleral mirror is non-.

EXAMPLE III

The new scleral mirror of this embodiment, wherein the diameter of the transition area is d, d is 4mm, the single or multiple sections of the circular arcs with different curvature radius forming the inner surface of the transition area are defined as the cutting power n, the two side ends of the cutting power n are P_nAnd P_n+1Establishing a two-dimensional coordinate system XY with the curvature center of the cornea as the origin, in which the end point coordinates on both sides of the cutting edge are P_n(X_n,Y_n) And P_n+1(X_n+1,Y_n+1) End point P_nAnd P_n+1The angles with the curvature center of the cornea are respectively T_nAnd T_n+1The end point of the power n can be obtained by measuring the corneal topography and correctly calculating the eyeball modelP_nAnd P_n+1Information P of_n(X_n,Y_n，T_n)，P_n+1(X_n+1,Y_n+1，T_n+1) Based on this, a single or multiple segments of circular arcs of different radii of curvature may be obtained, e.g. a preference n +1, a preference n +2, a preference n +3 …, with an end point P_n+1，P_n+2、P_n+2，P_n+3、P_n+3，P_n+4… with endpoint coordinate P_n+1(X_n+1,Y_n+1)，P_n+2(X_n+2,Y_n+2)、P_n+2(X_n+2,Y_n+2)，P_n+3(X_n+3,Y_n+3)、P_n+3(X_n+3,Y_n+3)，P_n+4(X_n+4,Y_n+4) … and the angle of the end points to the center of curvature of the cornea is T_n+1，T_n+2、T_n+2，T_n+3、T_n+3，T_n+4…, the radii of curvature of the cutting rules, e, n +1, n +2, n +3, 3 … may satisfy the following relations:

based on the above formula, the end point of the preference n is substituted into the formula to obtain R_n' and R_n", take R_n' and R_n"to obtain a value R of the radius of curvature of the cutting element_nThe same may be obtained, e.g. the value R of the curvature radius of the cutting preference n +1, n +2, n +3 …_n+1、R_n+2、R_n+3…；

As shown in fig. 1, wherein the radius of the comprehensive curved surface of the inner surface of the transition area is R_n、R_n+1、R_n+2、 R_n+3…;

as shown in fig. 2, the relationship diagram of the inner surface end point of the scleral mirror in the two-dimensional coordinate system, at this time, the surface cross section of the inner surface of the transition region is a single segment of circular arc, i.e. there is only a cutting plane 1, if it is necessary to perform multiple segments of circular arc extension on the inner surface of the transition region, it is able to perform continuous derivation based on theformula 2 to obtain cuttingplanes 2 to n;

based on the scheme, the surface shape characteristic of the transition region can be rapidly and accurately calculated, and the method is applicable to vision correction of irregular cornea.

Example four

The novel scleral mirror is characterized in that the surface section of the inner surface of the transition area, which is aspheric, is composed of three sections of arcs with different curvature radiuses, and the thickness between the inner surface of the transition area and the outer surface of the transition area is 0.3-0.5 mm;

based on the third embodiment, defining three different arcs of curvature radius forming the inner surface of the transition region as the preference 1, the preference 2 and the preference 3, wherein the two side ends of the preference 1, the preference 2 and the preference 3 are P1, P2, P2, P3 and P3, P4, respectively; establishing a two-dimensional coordinate system XY with the center of curvature of the cornea as the origin, in which two-sided end point coordinates of the cutting tool 1 are P1(X1, Y1) and P2(X2, Y2), two-sided end point coordinates of the cutting tool 2 are P2(X2, Y2) and P3(X3, Y3), two-sided end point coordinates of the cutting tool 3 are P3(X3, Y3) and P4(X4, Y4), and angles of the end points P1, P2, P3 and P4 with the center of curvature of the cornea are T respectively₁、T₂、T₃And T₄The information P of the end points P1, P2, P2, P3, P3 and P4 of the cutting preference 1, 2 and 3 can be obtained by measuring the topography of the cornea and correctly estimating the eyeball model₁(X₁,Y₁，T₁)，P₂(X₂,Y₂， T₂)、P₂(X₂,Y₂，T₂)，P₃(X₃,Y₃，T₃) And P₃(X₃,Y₃，T₃)，P₄(X₄,Y₄，T₄) The radii of curvature for the cutting edges, e.g. 1, 2 and 3, satisfy the following relations:

based on the above formula, the end points of the preference 1 are substituted into the formula to obtain R₁' and R₁", take R₁' and R₁"to obtain a value R of the curvature radius of the cutting insert 1₁The values of the curvature radius R for the cutting

rules

2 and 3₂And R₃I.e. the general curvature of the inner surface of the transition zoneRadius R₁、R₂And R₃A collection of (a).

EXAMPLE five

The novel scleral mirror of this embodiment, wherein, it is aspheric that the surface type cross section of the inner surface of the landing zone is composed of three circular arcs with different curvature radii, the inclination angle α is 3 to 5 °, the diameter of the landing zone is w, w is 8mm, the thickness thereof is 0.25 to 0.35mm, the three circular arcs with different curvature radii composing the inner surface of the landing zone can be defined as [ i ], [ ii ], and [ iii ], based on the formula:

obtaining values of curvature radius R for the preference i, ii and iii_i、R_iiAnd R_iiiI.e. the radius of the comprehensive curved surface of the inner surface of the landing zone is R_i、R_iiAnd R_iiiA set of (a);

wherein, store up the thickness range at tear interval and be 0 ~ 300 um.

EXAMPLE five

The novel scleral mirror of the embodiment comprises a diameter D of 20-24 mm, and is made of a high oxygen permeability material with a Dk value greater than 120;

the scleral lens is suitable in size, and the used material has high oxygen permeability, so that the wearing comfort can be effectively improved.

In conclusion, the invention adopts the free-form surface design, can correct high-order aberration, improves the imaging quality of the scleral lens, fits the inner surface of the scleral lens in a continuous derivation mode, ensures that the surface shape of the scleral lens is attached to the surface appearance of human eyes, reserves the tear storage interval, stores tears, ensures that the eyes keep moist without foreign body sensation, forms raised edges in the landing area, can effectively improve the stability of the scleral lens, is comfortable to wear, can be suitable for the vision correction of irregular cornea, and is favorable for the use and popularization of the scleral lens.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The novel scleral mirror is characterized by comprising an outer surface and an inner surface, wherein the outer surface and the inner surface are outwards arranged along the center and are sequentially divided into an optical area, a transition area and a landing area, the outer surface is a continuous free-form surface, the areas of the outer surface are divided into the optical area outer surface, the transition area outer surface and the landing area outer surface according to the optical area, the transition area and the landing area, and the inner surface is divided into the optical area inner surface, the transition area inner surface and the landing area inner surface according to the optical area, the transition area and the landing area;

2. The novel scleral mirror as claimed in claim 1, wherein the optical zone has a thickness D of 0.25-0.4 mm and a diameter D₀，D₀The optical zone is 8-12 mm, the curvature radius is 7.55-9.91 mm, and the free-form surface expressions of the outer surface of the optical zone and the inner surface of the optical zone are as follows:

3. A novel scleral lens as claimed in claim 2, wherein the diameter of the transition area is d, d is 4mm, the single or multiple sections of the circular arcs with different curvature radius forming the inner surface of the transition area are defined as Pn, the two side ends of Pn are Pn respectively_nAnd P_n+1Establishing a two-dimensional coordinate system XY with the curvature center of the cornea as the origin, in which the end point coordinates on both sides of the cutting edge are P_n(X_n,Y_n) And P_n+1(X_n+1,Y_n+1) End point P_nAnd P_n+1The angles with the curvature center of the cornea are respectively T_nAnd T_n+1The end point P of the power n can be obtained by measuring the corneal topography and correctly calculating the eyeball model_nAnd P_n+1Information P of_n(X_n,Y_n，T_n)，P_n+1(X_n+1,Y_n+1，T_n+1) Based on this, a single or multiple segments of circular arcs of different radii of curvature may be obtained, e.g. a preference n +1, a preference n +2, a preference n +3 …, with an end point P_n+1，P_n+2、P_n+2，P_n+3、P_n+3，P_n+4… with endpoint coordinate P_n+1(X_n+1,Y_n+1)，P_n+2(X_n+2,Y_n+2)、P_n+2(X_n+2,Y_n+2)，P_n+3(X_n+3,Y_n+3)、P_n+3(X_n+3,Y_n+3)，P_n+4(X_n+4,Y_n+4) … and the angle of the end points to the center of curvature of the cornea is T_n+1，T_n+2、T_n+2，T_n+3、T_n+3，T_n+4…, the radii of curvature of the cutting rules, e, n +1, n +2, n +3, 3 … may satisfy the following relations:

4. The novel scleral mirror as claimed in claim 3, wherein the aspheric inner surface of the transition region has a cross section of three circular arcs with different radii of curvature, and the thickness between the inner surface of the transition region and the outer surface of the transition region is 0.3-0.5 mm.

5. A novel scleral mirror as claimed in claim 4, wherein three segments of arcs of different radii of curvature constituting the inner surface of the transition region are defined as, for example, 1, 2 and 3, the two side ends of the said cutting edges being, for example, P1, P2, P2, P3 and P3, P4; establishing a two-dimensional coordinate system XY with the center of curvature of the cornea as the origin, in which two-sided end point coordinates of the cutting tool 1 are P1(X1, Y1) and P2(X2, Y2), two-sided end point coordinates of the cutting tool 2 are P2(X2, Y2) and P3(X3, Y3), two-sided end point coordinates of the cutting tool 3 are P3(X3, Y3) and P4(X4, Y4), and angles of the end points P1, P2, P3 and P4 with the center of curvature of the cornea are T respectively₁、T₂、T₃And T₄The information P of the end points P1, P2, P2, P3, P3 and P4 of the cutting preference 1, 2 and 3 can be obtained by measuring the topography of the cornea and correctly estimating the eyeball model₁(X₁,Y₁，T₁)，P₂(X₂,Y₂，T₂)、P₂(X₂,Y₂，T₂)，P₃(X₃,Y₃，T₃) And P₃(X₃,Y₃，T₃)，P₄(X₄,Y₄，T₄) The radii of curvature for the cutting edges, e.g. 1, 2 and 3, satisfy the following relations:

based on the above formulaBy substituting the end points of the preference 1 into the formula, R can be obtained₁' and R₁", take R₁' and R₁"to obtain a value R of the curvature radius of the cutting insert 1₁The values of the curvature radius R for the cutting rules 2 and 3₂And R₃。

6. A novel scleral mirror as claimed in claim 5, wherein the aspheric surface of the inner surface of the landing zone has a cross section of three circular arcs with different radii of curvature, the angle of inclination α is 3-5 °, the diameter of the landing zone is w, w is 8mm, and the thickness is 0.25-0.35 mm, the three circular arcs with different radii of curvature forming the inner surface of the landing zone can be defined as [ ii ], [ ii ] and [ iii ], based on the following formula:

7. The novel scleroscope of claim 6, wherein the tear storage compartment has a thickness in the range of 0-300 um.

8. A novel scleral lens as claimed in claim 6 or 7, wherein the diameter of the novel scleral lens is D, said D is 20-24 mm, and the material is high oxygen permeability material with Dk value greater than 120.