A posterior chamber phakic intraocular lens and a preparation method thereof

Abstract

The present invention discloses a posterior chamber phakic intraocular lens and a preparation method thereof, wherein the posterior chamber phakic intraocular lens comprises an optical body, a first support haptic and a second support haptic, wherein the optical body, the first support haptic and the second support haptic are an integrated structure, made of the same material, integrally formed, and the optical body is located between the first support haptic and the second support haptic; the optical body is composed of two optical surfaces, one optical surface is a plane, and the other optical surface is an aspheric surface characterized by a Q-type polynomial, and the projection curve of the aspheric surface on the Y-Z plane has a non-constant characterization equation. Compared with conventional aspheric surface designs, the present invention has a larger optical zone diameter, providing a higher amount of light entering the human eye at night.

Description

Technical Field

[0001] The invention relates to the technical field of artificial lenses, and in particular to a posterior chamber phakic artificial lens and a preparation method thereof. Background Art

[0002] The natural lens in the human eye has the ability to adjust vision due to the traction of the suspensory ligament and the expansion and contraction of the ciliary muscle. However, due to bad eye habits, long-term use of electronic devices, fewer extracurricular activities and other factors, long-term close-up use of the eyes weakens the adjustment ability of the ciliary muscle, causing refractive errors in the natural lens. When this happens, people tend to choose to wear external frame glasses to adjust the refractive errors of the natural lens.

[0003] With the continuous development of science and technology and the increasing demand for vision in people's daily lives, more and more corrective methods have entered people's field of vision to help patients restore their hyperopic vision. As a technical means different from corneal laser surgery, the posterior chamber phakic intraocular lens has the characteristics of not removing or damaging corneal tissue; different from traditional frame glasses, it has the characteristics of being free to wear and non-sensitive. Moreover, it can be taken out a second time without affecting daily activities, and has advantages in many aspects. The posterior chamber phakic intraocular lens is implanted between the lens and iris of the human eye, which can change the refractive state of the human eye, especially to correct high myopia.

[0004] The following factors need to be considered in the design of intraocular lenses for posterior chamber phakic eyes: The optical body of the intraocular lens for posterior chamber phakic eyes is implanted between the iris and the natural lens in the eye, and the fixed loop is located in the ciliary sulcus. After implantation, the intraocular lens needs to maintain a suitable positional relationship with both the iris and the natural lens. First of all, the contact with the iris determines that the arch height cannot be too high. The arch of the iris caused by excessive arch height will make the angle of the chamber smaller, causing angle-closure glaucoma; excessive contact between the intraocular lens and the iris also has the risk of causing damage to the uvea. At the same time, the distance between the intraocular lens and the natural lens determines that the arch height cannot be too small. Too small arch height will cause the intraocular lens and the natural lens to contact each other, causing contact cataracts.

[0005] Since the arch height has a clear size limit, the intraocular lens for posterior chamber phakic eyes needs to consider the ability to improve optical image quality while ensuring the arch height safety. An intraocular lens with a certain refractive power has a limited optical zone size under the limitation of the arch height. If the optical zone is not large enough, the dilated pupil of the human eye will cause glare problems in an environment with insufficient lighting. Generally, the pupils of patients with high myopia are larger than those of normal people. The higher the refractive power of the intraocular lens, the smaller the optical zone, which is more likely to cause glare problems.

[0006] In view of this, how to design a posterior chamber phakic intraocular lens that has a larger optical zone diameter while ensuring the refractive power, arch height and image quality of the human eye and provides a higher amount of light input for the human eye at night is a technical problem that technicians in the field need to solve. Summary of the invention

[0007] The present invention provides a posterior chamber phakic intraocular lens and a preparation method thereof, which can effectively increase the diameter of the optical zone while ensuring diopter correction and image quality, provide a higher amount of light intake for the human eye at night, reduce glare and halo, and obtain better visual effects.

[0008] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0009] A posterior chamber phakic intraocular lens comprises an optical body, a first support haptic and a second support haptic. The optical body, the first support haptic and the second support haptic are an integrated structure, made of the same material and integrally formed, and the optical body is located between the first support haptic and the second support haptic. The optical body consists of two optical surfaces, one optical surface is a plane, and the other optical surface is an aspheric surface characterized by a Q-type polynomial, and the aspheric surface has a vector height modulation.

[0010] In the above scheme, the Q-type polynomial is characterized as a non-constant characterization equation, that is, a gradient spherical aberration distribution. By reducing each local sagitta, the total sagitta is reduced, so that a larger optical zone is obtained under the same sagitta.

[0011] Furthermore, the method for determining the aspheric surface is as follows: taking the vertex of the optical surface as the origin O and the optical axis as the coordinate Z axis, an arbitrary spatial rectangular coordinate system is established, the abscissa X axis and the coordinate Y axis of the coordinate system are tangent to the optical surface, and the projection curve of the aspheric surface on the YZ plane has a non-constant characterization equation, which is expressed as follows:

[0012]

[0013] Wherein, Z(r) is the expression of the aspheric surface on the two-dimensional coordinate plane YZ, c is the reciprocal of the radius of curvature of the base spherical surface of the aspheric surface, r is the vertical distance from any point on the curve to the coordinate Z axis; Q is the quadratic surface constant of the aspheric surface;

[0014] Curve a, curve b, curve c, ... curve n represent a cluster of known curves with different spherical aberration distributions, ranging from 0 to -0.17um, where each curve corresponds to a certain Q value and is different from each other, namely Q a , Q b , Q c , Q d …Q n, the series Q value is reduced from the spherical aberration envelope to a function of r, that is, the spherical aberration modulation:

[0015]

[0016] Among them, α, β, χ, δ, and ε are constants, Q n Varies with size radius area.

[0017] Furthermore, Q n Take a set of points (r a , Q a )、(r b , Q b )、(r c , Q c )、(r d , Q d )、(r e , Q e ) The following aspheric equations are obtained:

[0018]

[0019]

[0020]

[0021]

[0022]

[0023] In pupil radius r n-1 to r n The local curve equation of the aspheric surface of the range is:

[0024]

[0025] Among them, Z n (r n ) is the expression of the aspheric surface on the two-dimensional coordinate plane YZ, c n is the curvature value of the current arc segment, r n Q is the vertical distance from any point on the curve to the coordinate Z axis; n is the quadratic constant of the aspheric surface, i.e. a matrix with infinite solutions;

[0026] Make the sag in the local area of ​​the aspherical surface less than or equal to the sag calculated by the local curvature c and Q value in the previous section, that is, sag modulation;

[0027]

[0028] Among them, ΔZ n (r n) is the domain, (r n , Q n ) is the point cluster solved in the definition domain; combined ΔZ n (r n ) and Q n Find the conditional extreme value of the aspheric equation system and use the least squares method to obtain the optimal solution.

[0029] In the above scheme, the optimal solution is obtained by optimizing the ZEMAX software. The entire optical surface shape is determined by the cross-section line. This cross-section line is divided into multiple segments, each with different curve characteristics, so as to achieve the effect of reducing the sagittal height and maintaining the optical performance of the optical zone. Among them, r n The first part of the paragraph refers to r n-1 Segment arc length.

[0030] Furthermore, the optical body is a plano-concave lens with an effective optical zone diameter of 5.5 mm.

[0031] Furthermore, the optical body is a plano-concave lens with a center thickness of 0.116 to 0.3 mm.

[0032] Furthermore, the thickness of the first support haptic and the second support haptic are both 0.12 mm.

[0033] Furthermore, the optical body is made of polyacrylate.

[0034] Furthermore, the optical body is made of hydrophilic polyacrylate.

[0035] Furthermore, the refractive index of the hydrophilic polyacrylate is 1.44.

[0036] A method for preparing a posterior chamber phakic intraocular lens comprises the following steps:

[0037] S1: Optical design: According to the above-mentioned method for determining the aspheric surface, determine the non-constant characterization equation, obtain the coordinate points on the plane YZ surface according to the curve cluster, obtain the aspheric surface equation group, rotate the coordinate point sequence around the Z axis to obtain the model of the entire fitting aspheric surface, build the initial model in ZEMAX, and then optimize to obtain the optimal solution;

[0038] S2: Turning and milling: Turn the refractive lens on the substrate, write the lathe program of hydrophilic material according to the optical surface parameters of the optical design; use the diamond single-point cutting technology to turn the optical body, the first support loop and the second support loop; write the milling machine program to mill the shape of the optical area and the loop foot;

[0039] S3: Polishing: Use low temperature roller polishing;

[0040] S4: Test Validation: Analyze the test in a simulated eye system.

[0041] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0042] The aspheric surface of the optical zone of the optical body of the present invention has a non-constant characterization equation. The optical body is imaged in the implanted eye. As the pupil size changes (mainly from 3 mm to 5.5 mm, it is generally believed that the spherical aberration of the human eye within a pupil diameter of 3 mm is zero, so it is not considered), the spherical aberration is reduced above 3 mm pupil, and only a small amount of positive spherical aberration is retained.

[0043] Compared with previous aspheric designs, the optical zone of the optical body of the present invention modulates spherical aberration and axially modulates the vector height. While retaining the amount of spherical aberration according to the pupil distribution law of the human cornea, the Q value increases with the pupil. At the same vector height, it has a larger optical zone diameter, providing the human eye with a higher amount of light entering at night and reducing glare and halo.

[0044] The optical zone of the optical main body of the present invention forms an image in the implanted eye, and always maintains a certain focal depth under a pupil diameter of 3 to 5.5 mm, so the visual quality is good.

[0045] Compared with conventional aspheric designs, the present invention is applicable to a wider range of human corneal asphericities. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The drawings are only used for illustrative purposes and are not to be construed as limitations of the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings.

[0047] Figure 1 A schematic diagram of the front structure of a phakic intraocular lens provided by an embodiment of the present invention;

[0048] Figure 2 is a side schematic diagram of a phakic intraocular lens provided by an embodiment of the present invention;

[0049] Figure 3 is a schematic diagram of pupil size and spherical aberration distribution provided by an embodiment of the present invention;

[0050] Figure 4 is a schematic diagram of pupil radius and spherical aberration fitting provided by an embodiment of the present invention;

[0051] Figure 5 is a schematic diagram of a surface type A of a fitting surface example provided in an embodiment of the present invention;

[0052] Figure 6 is a schematic diagram of a surface type B of a fitting surface example provided in an embodiment of the present invention;

[0053] Figure 7 It is a schematic diagram of a C-surface type of a fitting surface example provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Example 1

[0056] As the supporting element of the intraocular lens, the design of the support haptic plays a key role in the positional stability of the intraocular lens. Since the human cornea has positive spherical aberration, an aspherical intraocular lens with negative spherical aberration is needed to balance the inherent positive spherical aberration of the cornea, so as to obtain a better imaging point. A comprehensive image quality that balances the corneal spherical aberration in the human eye will bring better postoperative vision.

[0057] For easier understanding, see Figure 1-Figure 7 The present invention provides an embodiment of a posterior chamber phakic intraocular lens, wherein the intraocular lens comprises an optical body 1, a first support haptic 2 and a second support haptic 3, wherein the optical body 1 has an aspheric surface with a non-constant characterization equation, and the pupil diameter is 2r n The local curve equation of the aspheric surface is:

[0058]

[0059] And Q n Satisfied That is, spherical aberration modulation;

[0060] Satisfied That is, vector height modulation;

[0061] When the pupil diameter is 2rn<3mm, 2rn<3.75mm, 2rn<4.5mm, 2rn<5.25mm, 2rn<5.5mm, the aspheric coefficient Q is -12.86, -24.324, -35.4, -49.93, -60.11 respectively;

[0062] The present invention uses a curve fitting method to appropriately reduce the sagittal height and indirectly expand the aperture of the optical zone.

[0063] The present invention also provides a method for preparing a posterior chamber phakic intraocular lens, comprising the following steps:

[0064] Design: Within 3 to 5.5 mm, the residual spherical aberration of the implanted eye is maintained at 0.035 μm;

[0065] (1) Optical design: The requirements for the axial spherical aberration distribution of the intraocular lens are determined by the requirements for the residual spherical aberration. According to the requirements for the spherical aberration at different pupil diameters, the residual spherical aberration values ​​at different pupil diameters are determined, and the spherical aberration distribution curve is fitted. Figure 3 As shown by the circular marked lines, within 0-3mm, the residual spherical aberration is 0um; within 3.5mm pupil diameter, the residual spherical aberration is 0.006um; within 4mm pupil diameter, the residual spherical aberration is 0.01um; within 4.5mm pupil diameter, the residual spherical aberration is 0.017um; within 5mm pupil diameter, the residual spherical aberration is 0.026um; at the maximum pupil of 5.5mm, the residual spherical aberration is 0.034um.

[0066] Convert the spherical aberration distribution into a curve equation in three-dimensional space, such as Figure 4 As shown, the fitted spherical aberration distribution curve is marked with an envelope. Curve a, curve b, curve c, ... curve n represent a cluster of curves with different spherical aberrations, and the spherical aberration distribution ranges from 0um to -0.14um. Different curves determine different Q values, and the Q value equation of the curve cluster is:

[0067]

[0068] The fitted spherical aberration envelope intersects the curve cluster at points a, b, c…n, and the horizontal coordinates correspond to different pupil radii r a , r b 、r c …r n ; n is an integer from 1 to positive infinity. The aspheric projection curve within the pupil range of 0 to 5.5 mm is infinitely subdivided and does not have a constant equation in the macroscopic sense. a ,r b ,r c …r n The local curve equation of the aspheric surface is:

[0069]

[0070] According to the aspheric equations, the coordinate point (y a , Z a ), (y b , Z b )、(y c , Z c )、(y d , Z d ),…(y n , Z n), the projection curve is rotated along the Z axis to obtain the aspheric distribution of the entire axial spherical aberration progressive modulation, and the initial model is constructed in ZEMAX, and the optimal solution is obtained by optimization.

[0071] (2) Turning and milling: Turn the refractive lens on the substrate, write a lathe program for the hydrophilic material according to the optical surface parameters of the optical design; use diamond single-point cutting technology to turn the optical body 1, the first support haptic 2 and the second support haptic 3; write a milling machine program to mill the shape of the optical zone and the haptic foot.

[0072] (3) Polishing: Use low-temperature roller polishing method.

[0073] (4) Test verification: Analytical testing in a simulated eye system.

[0074] The design of the spherical aberration-fitted aspheric intraocular lens effectively increases the size of the optical zone of the phakic intraocular lens while ensuring the appropriate arch height value, and better adjusts the refractive error problem. Figure 5 As shown in the figure, the semi-aperture of the fitted aspheric surface is increased from 2.75mm to 2.83mm (2.827 in the figure, two decimal places are retained here, approximately equal to 2.83), and the size of the optical zone is increased from 5.5mm to 5.66mm. Figure 3 It can be seen that the spherical aberration fitting asphericity has a smooth and continuous curve line shape in the entire 5.66mm optical zone, without dead points or jumping discontinuities, which effectively improves the light energy utilization efficiency in the optical zone.

[0075] Depend on Figure 3 As shown by the dotted lines, the fitted aspheric surface has zero spherical aberration within the 3mm pupil range, reflecting excellent vision under good lighting conditions during the day. In the 3-5.5mm pupil range, the residual spherical aberration gradually increases and does not exceed 0.03um. In scenes with large pupils, i.e., insufficient lighting, the amount of spherical aberration produced is small, providing the human eye with a higher amount of light entering at night, resulting in less vision loss at night.

[0076] Example 2

[0077] Specifically, based on Example 1, the solution is described in combination with specific implementation examples to further reflect the technical effects of the solution. Specifically:

[0078] like Figure 1 As shown, a posterior chamber phakic intraocular lens comprises an optical body 1, a first support haptic 2 and a second support haptic 3. The optical body 1 has an aspheric surface with a non-constant characterization equation. n The local curve equation of the aspheric surface is:

[0079]

[0080] And Q n Satisfied That is, spherical aberration modulation;

[0081] Satisfied Vector Height Modulation

[0082] When the pupil diameter is 2rn<3mm, 2rn<3.75mm, 2rn<4.5mm, 2rn<5.25mm, 2rn<5.5mm, the aspheric coefficient Q is -12.86, -29.3, -46.5, -63.1, -80.2 respectively;

[0083] The optical body 1 and the first support haptic 2 and the second support haptic 3 are an integrated structure, made of the same material and integrally formed; and the optical body 1 is a plano-concave lens with an effective optical zone diameter of 5.5 mm and a center thickness of 0.116-0.3 mm: its first surface is a plane, and the second surface is a spherical aberration-fitted aspheric surface; the thickness of the first support haptic 2 and the second support haptic 3 are both 0.12 mm; the optical body 1 is made of hydrophilic polyacrylate with a refractive index of 1.44.

[0084] A design scheme for a method of preparing a posterior chamber phakic intraocular lens: within 3 to 5.5 mm, the residual spherical aberration of the implanted eye is maintained at 0.07 um;

[0085] (1) Optical design: First, the requirements for the axial spherical aberration distribution of the intraocular lens are determined by the requirements for the residual spherical aberration. According to the requirements for the spherical aberration at different pupil diameters, the residual spherical aberration values ​​at different pupil diameters are determined, and the spherical aberration distribution curve is fitted. Figure 3 As shown by the diamond-shaped marking lines, within 0-3mm, the residual spherical aberration is 0um; within 3.5mm pupil diameter, the residual spherical aberration is 0.01um; within 4mm pupil diameter, the residual spherical aberration is 0.014um; within 4.5mm pupil diameter, the residual spherical aberration is 0.027um; within 5mm pupil diameter, the residual spherical aberration is 0.045um; at the maximum pupil of 5.5mm, the residual spherical aberration is 0.07um.

[0086] Secondly, the spherical aberration distribution is converted into a curve equation in three-dimensional space. Different curves determine different Q values, and the curve cluster Q value equation is:

[0087]

[0088] The fitted spherical aberration envelope and the curve cluster intersect at points a, b, c...n. The horizontal coordinate of the intersection point is the pupil radius, and n is a positive integer sequence. The aspheric projection curve within the pupil range of 0 to 5.5 mm is infinitely subdivided and does not have a constant equation on a macro scale. a ,r b ,r c …r nThe local curve equation of the aspheric surface is:

[0089]

[0090] The coordinate points on the plane YZ are obtained according to the cluster of aspherical curves. The coordinate point sequence is rotated around the Z axis to obtain the model of the entire fitting aspherical surface. The initial model is constructed in Zemax software and optimized to obtain the optimal solution.

[0091] (2) Substrate turning: Write a lathe program according to the designed surface parameters; use diamond single-point turning technology to process the circular intraocular lens (i.e., the optical body 1, the first support haptic 2, and the second support haptic 3); write a milling machine program to mill out the cross-sectional shape of the optical zone and the haptic feet.

[0092] (3) Polishing to obtain an intraocular lens with a qualified optical surface.

[0093] (4) Analytical testing in model eyes.

[0094] The design of the intraocular lens with spherical aberration fitting aspheric surface effectively increases the optical zone size of the intraocular lens of phakic eyes. Figure 6 As shown, the semi-aperture of the fitted aspheric surface is increased from 2.75mm to 2.86mm (2.858 in the figure, two decimal places are retained here, approximately equal to 2.86) relative to the conventional aspheric surface, and the size of the optical zone is increased from 5.5mm to 5.72mm.

[0095] Example 3

[0096] Specifically, based on Example 1, the solution is described in combination with specific implementation examples to further reflect the technical effects of the solution. Specifically:

[0097] like Figure 1 As shown, a posterior chamber phakic intraocular lens comprises an optical body 1, a first support haptic 2 and a second support haptic 3. The optical body 1 has an aspheric surface with a non-constant characterization equation. n The local curve equation of the aspheric surface is:

[0098]

[0099] And Q n Satisfied That is, spherical aberration modulation;

[0100] Satisfied That is, vector height modulation;

[0101] When the pupil diameter is 2rn<3mm, 2rn<3.75mm, 2rn<4.5mm, 2rn<5.25mm, 2rn<5.5mm, the aspheric coefficient Q is -12.86, -34.54, -56.43, -78.76, -100.12 respectively;

[0102] The optical body 1, the first support haptic 2 and the second support haptic 3 are an integrated structure, made of the same material and integrally formed;

[0103] The optical body 1 is a plano-concave lens with an effective optical zone diameter of 5.5 mm and a center thickness of 0.116-0.3 mm: its first surface is a plane, and the second surface is a spherical aberration fitting aspheric surface; the thickness of the first support haptic 2 and the second support haptic 3 are both 0.12 mm; the optical body 1 is made of hydrophilic polyacrylate with a refractive index of 1.44.

[0104] A method for preparing a posterior chamber phakic intraocular lens:

[0105] Design: Within 3 to 5.5 mm, the residual spherical aberration of the implanted eye is maintained at 0.09 μm;

[0106] (1) Optical design: First, the requirements for the axial spherical aberration distribution of the intraocular lens are determined by the requirements for the residual spherical aberration. According to the requirements for the spherical aberration at different pupil diameters, the residual spherical aberration values ​​at different pupil diameters are determined, and the spherical aberration distribution curve is fitted. Figure 3 As shown, within 0-3mm, the residual spherical aberration is 0um; within 3.5mm pupil diameter, the residual spherical aberration is 0.01um; within 4mm pupil diameter, the residual spherical aberration is 0.02um; within 4.5mm pupil diameter, the residual spherical aberration is 0.04um; within 5mm pupil diameter, the residual spherical aberration is 0.06um; at the maximum pupil of 5.5mm, the residual spherical aberration is 0.09um.

[0107] Convert the spherical aberration distribution into a curve equation in three-dimensional space. Different curves determine different Q values, and the curve cluster Q value equation is:

[0108]

[0109] The fitted spherical aberration envelope and the curve cluster intersect at points a, b, c...n. The horizontal coordinate of the intersection point is the pupil radius, and n is a positive integer sequence. The aspheric projection curve within the pupil range of 0 to 5.5 mm is infinitely subdivided and does not have a constant equation on a macro scale. a ,r b ,r c …r n The local curve equation of the aspheric surface is:

[0110]

[0111] The coordinate points on the plane YZ are obtained according to the cluster of aspherical curves, and the coordinate point sequence is rotated around the Z axis to obtain the entire model of the fitted aspherical surface. The initial model is constructed in Zemax software and optimized to obtain the optimal solution.

[0112] (2) Substrate turning: Write a lathe program according to the designed surface parameters; use diamond single-point turning technology to machine the optical body 1, the first support loop 2 and the second support loop 3; write a milling machine program to mill out the cross-sectional shape of the optical area and the loop foot.

[0113] (3) Polishing: Obtain an intraocular lens with a qualified optical surface.

[0114] (4) Test verification: Analytical test in the model eye.

[0115] The design of the spherical aberration-fitted aspherical intraocular lens of the present invention effectively increases the optical zone size of the intraocular lens of the phakic eye. Figure 7 As shown, the semi-aperture of the fitted aspheric surface is increased from 2.75mm to 2.89mm compared to the conventional aspheric surface, and the optical zone size is increased from 5.5mm to 5.78mm.

[0116] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A posterior chamber phakic intraocular lens, comprising an optical body (1), a first support haptic (2) and a second support haptic (3), wherein the optical body (1) and the first support haptic (2) and the second support haptic (3) are an integrated structure, made of the same material and integrally formed, and the optical body (1) is located between the first support haptic (2) and the second support haptic (3); characterized in that: The optical body (1) is composed of two optical surfaces, one optical surface is a plane, and the other optical surface is an aspheric surface characterized by a Q-type polynomial, and the aspheric surface has a vector height modulation; The method for determining the aspheric surface is as follows: taking the vertex of the optical surface as the origin O and the optical axis as the coordinate Z axis, an arbitrary spatial rectangular coordinate system is established, the abscissa X axis and the coordinate Y axis of the coordinate system are tangent to the optical surface, and the projection curve of the aspheric surface on the YZ plane has a non-constant characterization equation, and its expression is as follows: Wherein, Z(r) is the expression of the aspheric surface on the two-dimensional coordinate plane YZ, c is the reciprocal of the radius of curvature of the base spherical surface of the aspheric surface, r is the vertical distance from any point on the curve to the coordinate Z axis; Q is the quadratic surface constant of the aspheric surface; Curve a, curve b, curve c, curve d, ... curve n represent a cluster of curves with different known spherical aberration distributions, and the spherical aberration distribution is 0 to -0.17um, where each curve corresponds to a certain Q value and is different from each other, namely Q a , Q b , Q c , Q d …Q n , the series Q value is reduced from the spherical aberration envelope to a function of r, that is, the spherical aberration modulation: Among them, α, β, χ, δ, and ε are constants, Q n Changes with size radius area; Q n Take a set of points (r a , Q a )、(r b , Q b )、(r c , Q c )、(r d , Q d )、(r e , Q e ) The following aspheric equations are obtained: In pupil radius r n-1 to r n The aspheric local curve equation of the range is: Among them, Z n (r n ) is the expression of the aspheric surface on the two-dimensional coordinate plane YZ, c n is the curvature value of the current arc segment, r n Q is the vertical distance from any point on the curve to the coordinate Z axis; n is the quadratic constant of the aspheric surface, i.e. a matrix with infinite solutions; Let the sag in the local area of ​​the aspherical surface be less than or equal to the sag calculated by the inverse c of the local curvature radius of the previous section and the Q value, that is, sag modulation; Among them, ΔZ n (r n ) is the domain, (r n , Q n ) is the point cluster solved in the definition domain; combined ΔZ n (r n ) and Q n Find the conditional extreme value of the aspheric equation system and use the least squares method to obtain the optimal solution.

2. A posterior chamber phakic intraocular lens according to claim 1, characterized in that: The optical body (1) is a plano-concave lens with an effective optical zone diameter of 5.5 mm.

3. A posterior chamber phakic intraocular lens according to claim 1, characterized in that: The optical body (1) is a plano-concave lens with a center thickness of 0.116-0.3 mm.

4. A posterior chamber phakic intraocular lens according to claim 1, characterized in that: The thickness of the first support haptic (2) and the second support haptic (3) are both 0.12 mm.

5. A posterior chamber phakic intraocular lens according to claim 1, characterized in that: The optical body (1) is made of polyacrylate.

6. A posterior chamber phakic intraocular lens according to claim 5, characterized in that: The optical body (1) is made of hydrophilic polyacrylate.

7. A posterior chamber phakic intraocular lens according to claim 6, characterized in that: The refractive index of the hydrophilic polyacrylate is 1.

44.

8. A method for preparing an intraocular lens according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Optical design: According to the above-mentioned method for determining the aspheric surface, determine the non-constant characterization equation, obtain the coordinate points on the plane YZ surface according to the curve cluster, obtain the aspheric surface equation group, rotate the coordinate point sequence around the Z axis to obtain the model of the entire fitting aspheric surface, build the initial model in ZEMAX, and then optimize to obtain the optimal solution; S2: Turning and milling: Turn the refractive lens on the substrate, write a lathe program for the hydrophilic material according to the optical surface parameters of the optical design; use the diamond single-point cutting technology to turn the optical body (1), the first support loop (2) and the second support loop (3); write a milling machine program to mill the shape of the optical area and the loop foot; S3: Polishing: Use low temperature roller polishing; S4: Test Validation: Analyze the test in a simulated eye system.

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