Freeform surface focal depth extending intraocular lens with vortex spherical aberration distribution

Abstract

The application discloses a free surface focal depth extension type intraocular lens with vortex spherical aberration distribution, which comprises an optical main body (1), a first support haptics (2) and a second support haptics (3), wherein the optical main body has a vortex spherical aberration distribution free surface optical area, realizes focal depth extension, and continuously connects the far vision and the intermediate vision; the structure is not limited by the pupil size, the implanted eye has vision with focal depth extension in any eye environment, gradually balances the corneal spherical aberration under different pupil sizes, improves the light energy utilization rate, reduces the glare and improves the visual comfort.

Description

Technical Field

[0001] This invention relates to the field of ophthalmic lens technology, and in particular to an artificial lens that achieves depth of focus extension through a freeform surface with vortex spherical aberration distribution. Background Technology

[0002] The intraocular lens and related surgical techniques have developed rapidly over the decades. Lens replacement surgery has evolved from the initial large-incision extracapsular cataract extraction to the current small-incision phacoemulsification cataract extraction combined with intraocular lens implantation, which has a shorter operation time, less tissue damage, and faster wound healing.

[0003] Cataract treatment has evolved from traditional cataract surgery to more challenging refractive surgery, requiring patients not only to see, but also to see clearly and well. Artificial lenses lack accommodative capabilities because the patient's eye cannot focus as naturally as a normal eye, freely switching between near, intermediate, and far vision.

[0004] Intraocular lenses (IOLs) can be categorized into monofocal and multifocal IOLs based on the number of focal points. The vast majority of IOLs on the domestic market are monofocal, offering good image quality and cost-effectiveness. However, they only provide clear vision at long distances (around 4 meters directly in front of the eye), while intermediate (around 66 centimeters directly in front of the eye) and near (around 40 centimeters directly in front of the eye) distances are not clear. Multifocal lenses were originally designed to address the issue of limited visual range; they can be bifocal or trifocal, compensating for insufficient near and intermediate vision. However, some multifocal IOLs excessively disperse the limited light energy, resulting in unclear images at each focal point. Furthermore, some patients cannot adapt to the interference between multiple images and the glare caused by diffraction structures post-surgery.

[0005] Some researchers have also designed and proposed adjustable intraocular lenses (IOLs), such as patents US6178878 and US10721155. All these adjustable IOL designs use mechanical structures to achieve lens displacement within the eye, thus enabling focusing. However, these complex mechanical structures are uncontrollable within the human eye, and their safety remains to be verified. Furthermore, the effectiveness of adjustable IOLs relies on the biomechanics of the ciliary muscle or suspensory ligaments, raising questions about their effectiveness for most presbyopic eyes that have lost their accommodative ability. No such products have yet been certified in the domestic market. Summary of the Invention

[0006] To address the aforementioned problems in existing technologies, the applicant of this invention provides a freeform surface intraocular lens with vortex spherical aberration distribution for extended focal depth. The optical body of this invention features a freeform surface optical zone with vortex spherical aberration distribution, achieving extended focal depth; simultaneously providing continuous visual range between distance and intermediate vision; and this structure is not limited by pupil size, ensuring extended visual depth in any visual environment after implantation; progressively balancing corneal spherical aberration under different pupil sizes; improving light energy utilization; reducing glare; and enhancing visual comfort.

[0007] The technical solution of the present invention is as follows:

[0008] An extended focal depth intraocular lens with vortex spherical aberration distribution, the intraocular lens comprising an optical body (1), a first support haptic (2), and a second support haptic (3), wherein the optical body (1) has a vortex spherical aberration distribution.

[0009] The optical body (1), the first support loop (2), and the second support loop (3) are an integral structure made of the same material and formed as a whole.

[0010] The optical body (1) has a 360° right-angled square edge around its perimeter, which effectively inhibits the development of secondary cataracts.

[0011] The optical body (1) consists of two optical surfaces, at least one of which is a freeform surface with vortex spherical aberration distribution. The freeform surface is composed of surface patches S1, S2, S3…Sn-1, Sn, where n is a positive integer and n≥3. The arrangement of S1, S2, S3…Sn-1, Sn can be either clockwise continuous, counterclockwise continuous, or axially symmetric. Figure 4 and Figure 5 .

[0012] Each surface patch follows the aspherical characterization equation as follows:

[0013]

[0014] An arbitrary spatial rectangular coordinate system is established with the vertex of the optical surface as the origin O and the optical axis as the Z-axis. The x-axis and y-axis of the coordinate system are tangent to the optical surface. Zn(x) is the curve expression of the q-surface patch Sn on the two-dimensional coordinate plane XZ, cn is the reciprocal of the radius of curvature of the basic spherical surface of the aspherical surface, y is the perpendicular distance of any point on the curve from the x-axis Z, An2i is the coefficient of the higher-order term of the surface patch Sn, M and N are both integers not less than 1 and N>M, Kn is the conic coefficient of the surface patch Sn, and Cn is the radius of curvature r of the conic surface patch Sn. n The reciprocal of k n Let be the conic coefficient of the surface patch Sn.

[0015] S1, S2, S3…Sn-1, Sn Each surface patch can have a different radius r n and k n .

[0016] k1, k2, k3…k n-1 ,k n The values ​​form an arithmetic or geometric sequence.

[0017] k n =k1+(n-1)*A, or k n =k1*A n-1 A is a constant.

[0018] S1, S2, S3…Sn-1, Sn. Each surface patch corresponds to an opening angle α1, α2, α3…αn-1, αn. The values ​​of α1, α2, α3…αn-1, αn form an arithmetic or geometric sequence.

[0019] αn = α1 + (n-1) * B, or αn = α1 * Bn-1, where B is a constant.

[0020] S1, S2, S3…Sn-1, Sn, each surface piece corresponds to an effective optical area diameter d1, d2, d3…dn-1, dn. Since each surface piece has a different sag height for the same aperture, the effective optical area diameter of each surface piece is different during the optical surface design process to balance the sag height, with any dn ≥ 5.5 mm. Finally, the excess optical area is removed by milling.

[0021] The focal depth extension of the effective optical zone of the optical body (1) is not affected by the pupil diameter, and the annular spherical aberration exhibits a vortex distribution.

[0022] The effective optical area of ​​the optical body (1) has a diameter of 5.5 to 6.5 mm and a center thickness of 0.45 to 1.55 mm, and is a biconvex / concave lens; the thickness of the first support haptic (2) and the second support haptic (3) is 0.15 to 0.45 mm.

[0023] The focal depth extension range of the optical body (1) is +0.5D to +3.0D (starting from the far focal point and defocusing towards the near distance, with MTF@50lp / mm≥0.15 as the reference line under standard simulated eye conditions).

[0024] The optical body (1) generates far vision and intermediate vision, and the visual range between far vision and intermediate vision is continuous.

[0025] The freeform surface depth-of-focus intraocular lens with vortex spherical aberration distribution of the present invention is prepared through the following design and preparation steps:

[0026] 1. Determine the target depth of field extension range T, +0.5D≤T≤+3.0D;

[0027] 2. Determine the opening angles α1, α2, α3, ..., αn-1, αn corresponding to each surface patch S1, S2, S3..., Sn-1, Sn. The values ​​of α1, α2, α3..., αn-1, αn form an arithmetic or geometric sequence. Based on the total depth-of-focus extension target value and the area occupied by each surface patch, allocate the defocusing target t = T*(αn / 2 / π) for each surface patch;

[0028] 3. In ZEMAX optical design software, construct the LB eye model, use odd-order aspherical surfaces to replace optical surfaces, and optimize the quadratic coefficients kn and An2i corresponding to the surface Sn in step 2 based on the defocused target. The expression for Zn(X) is obtained.

[0029] 4. Based on the appropriate processing method, select the arrangement of S1, S2, S3...Sn-1, Sn. The combination method can be a continuous clockwise arrangement, a continuous counterclockwise arrangement, or an axially symmetrical arrangement.

[0030] 5. Write a machining program based on the surface shape in step 4. The special surface shape distribution needs to be adapted to the fast tool servo system. After the machining program is completed, test run it on the lathe.

[0031] 6. Lathe, milling, and polishing processes. The hydrophobic acrylate substrate used for processing is obtained through molding, featuring a biconvex structure. The posterior surface (the optical surface near the capsular bag after implantation) has 360° right-angled square edges around its perimeter, effectively inhibiting the development of secondary cataracts. For the hydrophobic acrylate, the material reaches a glassy state at low temperatures. Using optical cold working methods and diamond single-point turning technology, a diffraction ring structure is machined on the anterior surface of the substrate (the optical surface near the cornea after implantation).

[0032] 7. Optical inspection: Measure the defocus MTF curve in an ISO simulated eye / Modeleye2 using 546nm monochromatic light. The target value must be met within a relatively deep extension range, and the MTF@50lp / mm must be ≥0.15 within the focal extension range.

[0033] The beneficial technical effects of this invention are as follows:

[0034] The optical body of this invention has a freeform optical region with vortex spherical aberration distribution, achieving depth of focus extension. The depth of focus extension range is +0.5D to +3.0D (starting from the far focal point and defocusing towards the near distance, with MTF@50lp / mm≥0.15 as the reference line under standard simulated eye conditions).

[0035] The focal depth extension of the effective optical zone of the optical body of this invention is not affected by the pupil diameter, and the circumaxial spherical aberration exhibits a vortex distribution.

[0036] The optical body of this invention produces both distance and intermediate vision after imaging, with continuous visual range between the two. The artificial lens of this invention, when implanted into the human eye, predicts minimal glare. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0038] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0039] Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0040] Figure 4 Design a phase distribution function for a conventional three-focal point;

[0041] Figure 5 This is the phase distribution function of Embodiment 1 of the present invention;

[0042] Figure 6 This is the phase distribution function of Embodiment 2 of the present invention;

[0043] Figure 7 This refers to the phase distribution function in Embodiment 3 of the present invention;

[0044] Figure 8 This is a defocused MTF curve distribution diagram of Embodiment 1 of the present invention. Detailed Implementation

[0045] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] Example 1

[0047] like Figure 1 As shown, a depth-of-focus intraocular lens with vortex spherical aberration distribution is disclosed. The intraocular lens includes an optical body (1), a first support haptic (2), and a second support haptic (3). The optical body (1) has a vortex spherical aberration distribution.

[0048] The optical body (1), the first support loop (2), and the second support loop (3) are an integral structure made of the same material and formed as a whole.

[0049] The optical body (1) has a 360° right-angled square edge around its perimeter, which effectively inhibits the formation of secondary cataracts. The optical body (1) consists of two optical surfaces, which can be spherical or aspherical, and one of the optical surfaces has a diffraction ring structure superimposed on it;

[0050] The effective optical area of ​​the optical body (1) has a diameter of 6.0 mm and a center thickness of 0.80 mm, forming a biconvex lens; the thickness of the first support haptic (2) and the second support haptic (3) is 0.35 mm.

[0051] The optical body 1 is made of hydrophobic polyacrylate with a refractive index of 1.45 to 1.55 and a dispersion coefficient of 45 to 55.

[0052] The method for preparing the artificial lens is as follows:

[0053] 1. Determine the range T of the target's depth of focus extension, where T = +1.2D;

[0054] 2. Determine the opening angles α1, α2, α3, ..., αn-1, αn for each surface patch S1, S2, S3...Sn-1, Sn. The values ​​of α1, α2, α3...αn-1, αn form an arithmetic sequence. αn = α1 + (n-1)*(π / 10)

[0055] Based on the total target value of depth of focus expansion and the area occupied by each surface piece, allocate the defocusing target t = T*(αn / 2 / π) to each surface piece;

[0056] 3. In ZEMAX optical design software, construct the LB eye model, use odd-order aspherical surfaces to replace optical surfaces, and optimize the quadratic coefficients kn and An2i corresponding to the surface Sn in step 2 based on the defocused target. The expression for Zn(X) is obtained.

[0057] 4. Based on the suitable processing method, select the arrangement of S1, S2, S3…Sn-1, Sn, and combine them in a clockwise continuous arrangement as follows: Figure 4 .

[0058] 5. Write a machining program based on the surface shape in step 4. The special surface shape distribution needs to be adapted to the fast tool servo system. After the machining program is completed, test run it on the lathe.

[0059] 6. Lathe, milling, and polishing processes. The hydrophobic acrylate substrate used for processing is obtained through molding, featuring a biconvex structure. The posterior surface (the optical surface near the capsular bag after implantation) has 360° right-angled square edges around its perimeter, effectively inhibiting the development of secondary cataracts. For the hydrophobic acrylate, the material reaches a glassy state at low temperatures. Using optical cold working methods and diamond single-point turning technology, a diffraction ring structure is machined on the anterior surface of the substrate (the optical surface near the cornea after implantation).

[0060] 7. Optical inspection: Measure the defocus MTF curve in an ISO simulated eye / Modeleye2 using 546nm monochromatic light. The target value must be met within a relatively deep extension range, and the MTF@50lp / mm must be greater than 0.15 within the focal extension range.

[0061] Results analysis and discussion:

[0062] Figure 6 The defocus MTF curves in the figure were obtained by placing the IOL from Example 1 within the eye model required by ISO 11979-2 and testing it using optical equipment. As can be seen from the figure, the MTF@50lp / mm at long distance is around 0.5, the MTF@50lp / mm at mid-distance is around 0.36, the depth of focus extension range is around 1.2D, and the MTF@50lp / mm at both long and mid-distance distances is greater than 0.15. This is basically consistent with the design requirements of steps 1 and 7.

[0063] Example 2

[0064] like Figure 2 As shown, a depth-of-focus intraocular lens with vortex spherical aberration distribution is disclosed. The intraocular lens includes an optical body (1), a first support haptic (2), and a second support haptic (3). The optical body (1) has a vortex spherical aberration distribution.

[0065] The optical body (1), the first support loop (2), and the second support loop (3) are an integral structure made of the same material and formed as a whole.

[0066] The optical body (1) has a 360° right-angled square edge around its perimeter, which effectively inhibits the formation of secondary cataracts. The optical body (1) consists of two optical surfaces, which can be spherical or aspherical, and one of the optical surfaces has a diffraction ring structure superimposed on it;

[0067] The effective optical area of ​​the optical body (1) has a diameter of 6.0 mm and a center thickness of 0.80 mm, forming a biconvex lens; the thickness of the first support haptic (2) and the second support haptic (3) is 0.35 mm.

[0068] The optical body 1 is made of hydrophobic polyacrylate with a refractive index of 1.45 to 1.55 and a dispersion coefficient of 45 to 55.

[0069] The method for preparing the artificial lens is as follows:

[0070] 1. Determine the range T of the target's depth of focus extension, where T = +1.8D;

[0071] 2. Determine the opening angles α1, α2, α3, ..., αn-1, αn corresponding to each surface patch S1, S2, S3...Sn-1, Sn. The values ​​of α1, α2, α3...αn-1, αn form an arithmetic sequence. αn = α1 + (n-1)*(π / 5)

[0072] Based on the total target value of depth of focus expansion and the area occupied by each surface piece, allocate the defocusing target t = T*(αn / 2 / π) to each surface piece;

[0073] 3. In ZEMAX optical design software, construct the LB eye model, use odd-order aspherical surfaces to replace optical surfaces, and optimize the quadratic coefficients kn and An2i corresponding to the surface Sn in step 2 based on the defocused target. The expression for Zn(X) is obtained.

[0074] 4. Based on the suitable processing method, select the arrangement of S1, S2, S3…Sn-1, Sn, with the combination method being an axisymmetric arrangement, such as… Figure 5 .

[0075] 5. Write a machining program based on the surface shape in step 4. The special surface shape distribution needs to be adapted to the fast tool servo system. After the machining program is completed, test run it on the lathe.

[0076] 6. Lathe, milling, and polishing processes. The hydrophobic acrylate substrate used for processing is obtained through molding, featuring a biconvex structure. The posterior surface (the optical surface near the capsular bag after implantation) has 360° right-angled square edges around its perimeter, effectively inhibiting the development of secondary cataracts. For the hydrophobic acrylate, the material reaches a glassy state at low temperatures. Using optical cold working methods and diamond single-point turning technology, a diffraction ring structure is machined on the anterior surface of the substrate (the optical surface near the cornea after implantation).

[0077] 7. Optical inspection: Measure the defocus MTF curve in an ISO simulated eye / Modeleye2 using 546nm monochromatic light. The target value must be met within a relatively deep extension range, and the MTF@50lp / mm must be greater than 0.15 within the focal extension range.

[0078] Results analysis and discussion:

[0079] Figure 7 The defocus MTF curves in the figure were obtained by placing the IOL from Example 1 within the eye model required by ISO 11979-2 and testing it using optical equipment. As can be seen from the figure, the MTF@50lp / mm at long distance is approximately 0.43, the MTF@50lp / mm at mid-distance is approximately 0.24, the depth of focus extension range is approximately 1.8D, and the MTF@50lp / mm at both long and mid-distance distances is greater than 0.15. This is basically consistent with the design requirements of steps 1 and 7.

[0080] Example 3

[0081] like Figure 3 As shown, a depth-of-focus intraocular lens with vortex spherical aberration distribution is disclosed. The intraocular lens includes an optical body (1), a first support haptic (2), and a second support haptic (3). The optical body (1) has a vortex spherical aberration distribution.

[0082] The optical body (1), the first support loop (2), and the second support loop (3) are an integral structure made of the same material and formed as a whole.

[0083] The optical body (1) has a 360° right-angled square edge around its perimeter, which effectively inhibits the formation of secondary cataracts. The optical body (1) consists of two optical surfaces, which can be spherical or aspherical, and one of the optical surfaces has a diffraction ring structure superimposed on it;

[0084] The effective optical area of ​​the optical body (1) has a diameter of 6.0 mm and a center thickness of 0.80 mm, forming a biconvex lens; the thickness of the first support haptic (2) and the second support haptic (3) is 0.35 mm.

[0085] The optical body 1 is made of hydrophobic polyacrylate with a refractive index of 1.45 to 1.55 and a dispersion coefficient of 45 to 55.

[0086] The method for preparing the artificial lens is as follows:

[0087] 1. Determine the range T of the target depth of focus extension, where T = +2.3D;

[0088] 2. Determine the opening angles α1, α2, α3, ..., αn-1, αn for each surface patch S1, S2, S3...Sn-1, Sn. The values ​​of α1, α2, α3...αn-1, αn form a geometric sequence. αn = α1 * 0.9 n-1 ,

[0089] Based on the total target value of depth of focus expansion and the area occupied by each surface piece, allocate the defocusing target t = T*(αn / 2 / π) to each surface piece;

[0090] 3. In ZEMAX optical design software, construct the LB eye model, use odd-order aspherical surfaces to replace optical surfaces, and optimize the quadratic coefficients kn and An2i corresponding to the surface Sn in step 2 based on the defocused target. The expression for Zn(X) is obtained.

[0091] 4. Based on the suitable processing method, select the arrangement of S1, S2, S3…Sn-1, Sn, with the combination method being an axisymmetric arrangement, such as… Figure 5 .

[0092] 5. Write a machining program based on the surface shape in step 4. The special surface shape distribution needs to be adapted to the fast tool servo system. After the machining program is completed, test run it on the lathe.

[0093] 6. Lathe, milling, and polishing processes. The hydrophobic acrylate substrate used for processing is obtained through molding, featuring a biconvex structure. The posterior surface (the optical surface near the capsular bag after implantation) has 360° right-angled square edges around its perimeter, effectively inhibiting the development of secondary cataracts. For the hydrophobic acrylate, the material reaches a glassy state at low temperatures. Using optical cold working methods and diamond single-point turning technology, a diffraction ring structure is machined on the anterior surface of the substrate (the optical surface near the cornea after implantation).

[0094] 7. Optical inspection: Measure the defocus MTF curve in an ISO simulated eye / Modeleye2 using 546nm monochromatic light. The target value must be met within a relatively deep extension range, and the MTF@50lp / mm must be greater than 0.15 within the focal extension range.

[0095] Results analysis and discussion:

[0096] Figure 8 The defocus MTF curves in the figure were obtained by placing the IOL from Example 1 within the eye model required by ISO 11979-2 and testing it using optical equipment. As shown in the figure, the MTF@50lp / mm at long distance is approximately 0.35, the MTF@50lp / mm at mid-distance is approximately 0.20, the depth of focus extension range is approximately 1.8D, and the MTF@50lp / mm at both long and mid-distance distances is greater than 0.15. This is basically consistent with the design requirements of steps 1 and 7.

Claims

1. A free-form surface depth-of-focus intraocular lens with vortex spherical aberration distribution, the intraocular lens comprising an optical body (1), a first support haptic (2), and a second support haptic (3), characterized in that, The optical body (1) has a vortex spherical aberration distribution. The optical body (1) consists of two optical surfaces, at least one of which is a freeform surface with a vortex spherical aberration distribution. The freeform surface is composed of surface patches S1, S2, S3…Sn-1, Sn, where n is a positive integer and n≥3. The combination of S1, S2, S3…Sn-1, Sn is either a continuous clockwise arrangement, a continuous counterclockwise arrangement, or an axisymmetric arrangement. Each surface patch follows the aspherical characterization equation as follows: ； A spatial rectangular coordinate system is established with the vertex of the optical surface as the origin O and the optical axis as the Z-axis. The x-axis and y-axis of this coordinate system are tangent to the optical surface. n (x) is the curve expression of the surface patch Sn on the two-dimensional coordinate system plane XZ, c n Let y be the reciprocal of the radius of curvature of the underlying spherical surface of the aspherical surface, and let y be the vertical distance from any point on the curve to the horizontal coordinate axis Z. n2i Let M and N be the coefficients of higher-order terms of the surface patch Sn, where M and N are both integers not less than 1 and N > M, and K n Let be the conic coefficient of the surface patch Sn, and Cn be the conic radius of curvature r of the surface patch Sn. n The reciprocal of k n Let Sn be the conicity coefficient of the surface patch. S1, S2, S3…Sn-1, Sn, each surface patch has a different radius r. n and k n , k1, k2, k3…k n-1 ,k n The values ​​form an arithmetic or geometric sequence. k n =k1 +(n-1)*A, or k n =k1 *A n-1 A is a constant. S1, S2, S3…Sn-1, Sn. Each surface patch corresponds to an opening angle α1, α2, α3…αn-1, αn; the values ​​of α1, α2, α3…αn-1, αn form an arithmetic or geometric sequence. αn=α1+(n-1)*B, or αn=α1*B n-1 B is a constant. S1, S2, S3…Sn-1, Sn. Each surface piece corresponds to an effective optical area diameter d1, d2, d3…dn-1, dn. Since each surface piece has a different sag height under the same aperture, in order to balance the sag height, the effective optical area diameter of each surface piece is different during the design of the optical surface. It is specified that any dn≥5.5mm. Finally, the excess optical area is removed by milling. The method for preparing the depth-of-focus intraocular lens with vortex spherical aberration distribution includes the following steps: Step 1: Determine the target depth of field extension range T, +0.5D≤T≤+3.0D; Step 2: Determine the opening angles α1, α2, α3…αn-1, αn corresponding to each surface piece S1, S2, S3…Sn-1, Sn; the values ​​of α1, α2, α3…αn-1, αn form an arithmetic or geometric sequence. Based on the total depth of focus target value and the area occupied by each surface piece, allocate the defocusing target t=T*(αn / 2 / π) to each surface piece. Step 3: In ZEMAX optical design software, construct the LB eye model, using odd-order aspherical surfaces to replace the optical surfaces. Based on the defocused target supported by the surface patch Sn in Step 2, optimize to obtain the quadratic coefficient k corresponding to the surface patch Sn. n and A n2i Z n (x) expression; Step 4: Select the arrangement of S1, S2, S3...Sn-1, Sn according to the appropriate processing method. The combination method is either clockwise continuous arrangement, counterclockwise continuous arrangement, or axisymmetric arrangement. Step 5: Write a machining program based on the surface shape in Step 4. The special surface shape distribution needs to be adapted to the fast tool servo system. After the machining program is completed, test run it on the lathe. Step 6: Lathe, milling, and polishing processes. The hydrophobic acrylate substrate used for processing is obtained by molding, with a biconvex structure. The posterior surface has 360° right-angled square edges, which effectively inhibits the formation of secondary cataracts. For hydrophobic acrylate, the material reaches a glassy state at low temperatures. Optical cold processing methods and diamond single-point turning technology are used to machine a diffraction ring structure on the anterior surface of the substrate. The posterior surface is the optical surface near the capsular bag after implantation, and the anterior surface is the optical surface near the cornea after implantation. Step 7: Optical inspection. Measure the defocus MTF curve in ISO simulated eye / Model eye2. Test with 546nm monochromatic light. The target value must be met in the range of deep extension, and the MTF@50lp / mm in the focal extension range must be ≥0.

15.

2. The freeform surface depth-of-focus intraocular lens with vortex spherical aberration distribution according to claim 1, characterized in that, The optical body (1), the first support loop (2), and the second support loop (3) are an integral structure made of the same material and formed as a whole.

3. The freeform surface depth-of-focus intraocular lens with vortex spherical aberration distribution according to claim 1, characterized in that, The optical body (1) has a 360° right-angled square edge around its perimeter, which effectively inhibits the development of secondary cataracts.

4. The freeform surface depth-of-focus intraocular lens with vortex spherical aberration distribution according to claim 1, characterized in that, The focal depth extension of the effective optical zone of the optical body (1) is not affected by the pupil diameter, and the circumaxial spherical aberration exhibits a vortex distribution.

5. The freeform surface depth-of-focus intraocular lens with vortex spherical aberration distribution according to claim 1, characterized in that, The effective optical area of ​​the optical body (1) has a diameter of 5.5 to 6.5 mm and a center thickness of 0.45 to 1.55 mm, and is a biconvex / concave lens; the thickness of the first support haptic (2) and the second support haptic (3) is 0.15 to 0.45 mm.

6. The freeform surface depth-of-focus intraocular lens with vortex spherical aberration distribution according to claim 1, characterized in that, The focal depth extension range of the optical body (1) is +0.5D to +3.0D, starting from the far focal point and defocusing towards the near distance. Under standard simulated eye conditions, MTF@50lp / mm≥0.15 is used as the reference line.

7. The freeform surface depth-of-focus intraocular lens with vortex spherical aberration distribution according to claim 1, characterized in that, The optical body (1) generates far vision and intermediate vision, and the visual range between far vision and intermediate vision is continuous.

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