Out-of-focus lens and design method thereof

Abstract

The embodiment of the invention provides an out-of-focus lens and a design method thereof. N annular optical correction areas and N annular optical out-of-focus areas are alternately arranged on the radial outer side of one circular optical correction area and are concentric. The ratio of the total area of the annular optical defocus area to the total area of the defocus lens is 0.55-0.58. The focal power of the optical correction area is first focal power, and the focal power of the optical defocus area is second focal power. The optical correction area image space focus is located on the image space of the annular optical correction area image space focus. By applying the embodiment, the plurality of optical correction areas form a clear image on the retina of the human eye to correct refractive error of the human eye, the plurality of optical defocus areas form an image in front of the retina to generate myopia defocus to delay eye axis growth, the optical correction areas and the optical defocus areas are alternately arranged, and the eye axis growth is delayed by controlling the areas of the optical correction areas and the optical defocus areas. The peripheral defocusing effect is achieved, the visual quality is improved, and the myopia progress is delayed.

Description

Technical Field

[0001] This invention relates to the field of optical lens design technology, and in particular to a defocused lens and its design method. Background Technology

[0002] Visual function is a crucial pathway for humans to acquire information from the outside world. In the field of myopia correction in adolescents, two main treatment methods are commonly used in clinical practice: optical intervention and surgery. Optical intervention includes wearing optical devices such as eyeglasses and contact lenses; surgery mainly uses laser technology to adjust the refractive properties of the cornea. However, both current correction methods have significant shortcomings: optical devices may reduce visual quality and cause fitting difficulties, while surgery has permanent alterations and is limited by factors such as age.

[0003] When correcting vision using optical devices, single-vision lenses, providing only a single refractive power, require continuous eye muscle adjustment when viewing near objects, easily leading to visual fatigue and potentially worsening myopia and axial length changes. While bifocal lenses differentiate between near and far vision zones, noticeable image jumps occur during gaze transitions, disrupting visual flow. Progressive multifocal lenses achieve visual transitions at different distances through continuously varying refractive power, effectively alleviating accommodative fatigue, but their peripheral distortion areas may interfere with dynamic visual performance. Currently, most mainstream defocus lenses on the market employ variable-width or discrete defocus ring designs, generally suffering from unstable defocus and poor image clarity. Therefore, there is an urgent need for a lens and its design method that can improve visual quality and slow myopia progression. Summary of the Invention

[0004] The purpose of this invention is to provide a defocused lens and its design method to improve visual quality and slow the progression of myopia. The specific technical solution is as follows:

[0005] In a first aspect, embodiments of the present invention provide a defocus lens, the defocus lens comprising one circular optical correction area, N annular optical correction areas, and N annular optical defocus areas;

[0006] N satisfies: ;

[0007] The circular optical correction area is located at the optical center of the defocus lens;

[0008] The N annular optical correction areas and the N annular optical defocus areas are arranged alternately on the radially outer side of the circular optical correction area; and the N annular optical correction areas, the N annular optical defocus areas, and the circular optical correction area are concentric.

[0009] The ratio of the total area of ​​the annular optical defocusing region to the total area of ​​the defocusing lens satisfy: ;

[0010] The optical power of the circular optical correction area and the N annular optical correction areas are both the first optical power, and the optical power of the N annular optical defocus areas are both the second optical power. The first optical power and the second optical power are different.

[0011] The image focal points of the circular optical correction area and the N annular optical correction areas The image-side focal points of the N annular optical defocus zones satisfy: lie in Like a square.

[0012] In one possible implementation, the height of the defocused lens satisfies the aspherical equation.

[0013] In one possible implementation, the adjacent optical correction zone and the annular optical defocus zone satisfy a cosine function.

[0014] In one possible implementation, N satisfies: .

[0015] In one possible implementation, the width of the annular optical defocus zone satisfy: The width of the six annular optical defocus zones from the center to the edge of the defocused lens. , , , , , satisfy: , , , , , .

[0016] In one possible implementation, the ratio of the total area of ​​the annular optical defocus zone to the total area of ​​the annular optical correction zone is... satisfy: .

[0017] In one possible implementation, the defocusing amount Df and the central refractive power D of the annular optical defocusing zone satisfy: .

[0018] In one possible implementation, the radius R of the defocus lens and the radius of the circular optical correction zone... satisfy: , The outer radius of the six annular optical defocus zones from the center to the edge of the defocused lens. , , , , , satisfy: , , , , , .

[0019] In one possible implementation, the lens material of the defocus lens is a highly oxygen-permeable silica hydrogel, and the water content of the defocus lens is... and center thickness satisfy: , .

[0020] Secondly, embodiments of the present invention provide a method for designing a defocus lens, the method comprising:

[0021] A defocusing lens is provided; wherein the defocusing lens includes one circular optical correction area, N annular optical correction areas, and N annular optical defocusing areas; N satisfies: The circular optical correction area is located at the optical center of the defocus lens; the N annular optical correction areas and the N annular optical defocus areas are alternately arranged radially outside the circular optical correction area; and the N annular optical correction areas, the N annular optical defocus areas, and the circular optical correction area are concentric; the ratio of the total area of ​​the annular optical defocus areas to the total area of ​​the defocus lens is... satisfy: The optical power of the circular optical correction area and the N annular optical correction areas are both first optical powers, and the optical power of the N annular optical defocus areas are both second optical powers, wherein the first optical power and the second optical power are different; the image-side focal points of the circular optical correction area and the N annular optical correction areas are... The image-side focal points of the N annular optical defocus zones satisfy: lie in Like a square.

[0022] Beneficial effects of the embodiments of the present invention:

[0023] This invention provides a defocus lens and its design method. The defocus lens includes one circular optical correction area, N annular optical correction areas, and N annular optical defocus areas, where N is between 5 and 7. The circular optical correction area is located at the optical center of the defocus lens. The N annular optical correction areas and N annular optical defocus areas are arranged alternately on the radially outer side of the circular optical correction area and are concentric. The ratio of the total area of ​​the annular optical defocus areas to the total area of ​​the defocus lens is... The value ranges from 0.55 to 0.58. The optical power of the optical correction zone is always the first optical power, while the optical power of the optical defocus zone is always the second optical power. The first and second optical powers differ. The image-side focal points of the circular and annular optical correction zones are... Image focal point located in the annular optical correction zone The image is formed by multiple optical correction zones on the retina of the human eye to correct refractive errors. Multiple optical defocus zones are used to form an image in front of the retina to produce myopic defocus and slow down axial elongation. The optical correction zones of the first power and the optical defocus zones of the second power are arranged alternately. By controlling the area of ​​the optical correction zones and the optical defocus zones, a peripheral defocus effect is achieved, which improves visual quality and slows down the progression of myopia.

[0024] Of course, implementing any product or method of the present invention does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0026] Figure 1 A front view of the structure of the defocus lens provided in an embodiment of the present invention;

[0027] Figure 2 A side view of the structure of the defocus lens provided in an embodiment of the present invention;

[0028] Figure 3 Another side view of the structure of the defocus lens provided in an embodiment of the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art based on the present invention are within the scope of protection of the present invention.

[0030] This invention provides a defocus lens, which includes one circular optical correction area, N annular optical correction areas, and N annular optical defocus areas, where N satisfies: For ease of description, this article uses a value of 6 for N as an example to illustrate the defocus lens provided in the embodiments of the present invention. The principle is the same for cases where N is not 6, the only difference being that the number of annular optical correction areas and annular optical defocus areas in the following embodiments are replaced with other numbers, which will not be repeated here.

[0031] See Figure 1 , Figure 1 This is a front view of the structure of a defocus lens provided in an embodiment of the present invention. The defocus lens includes one circular optical correction area, six annular optical correction areas, and six annular optical defocus areas. The circular optical correction area is located at the optical center of the defocus lens, and the six annular optical correction areas and six annular optical defocus areas are arranged alternately radially outside the circular optical correction area. Furthermore, the six annular optical correction areas, the six annular optical defocus areas, and the circular optical correction area are concentric. See also... Figure 2 , Figure 2 This is a side view of the structure of a defocused lens provided in an embodiment of the present invention. Figure 2 The image shown is Figure 1 The side view of the defocus lens 1 shown.

[0032] From the center to the edge of the defocus lens 1, they are sequentially labeled as: circular optical defocus area 120, first annular optical defocus area 131, first annular optical defocus area 121, second annular optical defocus area 132, second annular optical defocus area 122, third annular optical defocus area 133, third annular optical defocus area 123, fourth annular optical defocus area 134, fourth annular optical defocus area 124, fifth annular optical defocus area 135, fifth annular optical defocus area 125, sixth annular optical defocus area 136, and sixth annular optical defocus area 126.

[0033] The ratio of the total area of ​​the annular optical defocusing areas (first annular optical defocusing area 131 to sixth annular optical defocusing area 136) to the total area of ​​the defocusing lens 1. satisfy: ;

[0034] The optical power of the circular optical correction area 120 and the six annular optical correction areas (first annular optical correction area 121 to sixth annular optical correction area 126) is the first optical power, and the optical power of the six annular optical defocus areas (first annular optical defocus area 131 to sixth annular optical defocus area 136) is the second optical power. The first optical power and the second optical power are different.

[0035] See Figure 3 , Figure 3 Another side view of the structure of the defocus lens provided in this embodiment of the invention, showing the image-side focal points of the circular optical correction area and the six annular optical correction areas. Image-side focal points of 6 annular optical defocus zones satisfy: lie in Like a square.

[0036] In this article, the areas of the defocused lens, the annular optical defocused area, and the optical correction area are all projected areas.

[0037] Using the above embodiments, the defocus lens includes one circular optical correction area, six annular optical correction areas, and six annular optical defocus areas. The circular optical correction area is located at the optical center of the defocus lens. The six annular optical correction areas and six annular optical defocus areas are arranged alternately on the radially outer side of the circular optical correction area and are concentric. The ratio of the total area of ​​the annular optical defocus areas to the total area of ​​the defocus lens is... The value ranges from 0.55 to 0.58. The optical power of the optical correction zone is always the first optical power, while the optical power of the optical defocus zone is always the second optical power. The first and second optical powers differ. The image-side focal points of the circular and annular optical correction zones are... Image focal point located in the annular optical correction zone The image is formed by multiple optical correction zones on the retina of the human eye to correct refractive errors. Multiple optical defocus zones are used to form an image in front of the retina to produce myopic defocus and slow down axial elongation. The optical correction zones of the first power and the optical defocus zones of the second power are arranged alternately. By controlling the area of ​​the optical correction zones and the optical defocus zones, a peripheral defocus effect is achieved, which improves visual quality and slows down the progression of myopia.

[0038] As mentioned earlier, the ratio of the total area of ​​the annular optical defocusing areas (first annular optical defocusing area 131 to sixth annular optical defocusing area 136) to the total area of ​​the defocusing lens 1 is... satisfy: .

[0039] In one possible embodiment, when When the above conditions are met, the area of ​​each annular optical defocus zone is the same, expressed as a ratio. Taking 0.58 as an example, that is, the area of ​​each annular optical defocusing area accounts for about 0.097 times the total area. The total area of ​​the defocusing lens 1 is calculated by the following formula (1):

[0040] ...Formula (1)

[0041] in, The total area of ​​defocus lens 1 Pi is a constant. Let be the radius of the defocus lens 1.

[0042] The area of ​​each annular optical defocus zone is calculated using the following formula (2):

[0043] ...Formula (2)

[0044] in, Let n be the area of ​​the nth annular optical defocusing zone. The radius of the outer circle of the annular optical defocus zone. It is the inner radius of the annular optical defocus zone.

[0045] Based on this, the area of ​​each annular optical defocus zone can also be calculated using the following formula (3):

[0046] ...Formula (3)

[0047] The outer radius of each annular optical defocus zone is calculated using the following formula (4):

[0048] ...Formula (4)

[0049] Based on the above formulas (1) to (4), the inner radius of each annular optical defocusing zone can be set, and the outer radius of the annular optical defocusing zone can be obtained. After obtaining the outer radius, the inner radius of the next annular optical defocusing zone can be set.

[0050] In another possible embodiment, when When the above conditions are met, the width of each annular optical defocus zone is the same, which can be achieved through... With the same numerical value and width, the outer and inner radii of each annular optical defocus zone are calculated.

[0051] In one possible implementation, to make the transition smoother and produce less ghosting, the width of the annular optical defocusing zone is set to 0.4mm-0.55mm, and the width of the annular optical correction zone is set to 0.3mm-0.4mm.

[0052] The width of the annular optical defocusing area is the difference between the outer radius and the inner radius of the annular optical defocusing area.

[0053] Specifically, the width of the annular optical defocus zone satisfy: The width of the six annular optical defocus zones extending from the center to the edge of defocus lens 1 , , , , , satisfy: , , , , , .

[0054] In one possible implementation, the ratio of the total area of ​​the annular optical defocus zone to the total area of ​​the annular optical correction zone is... satisfy: .

[0055] In one specific embodiment, The value is 1.5.

[0056] In this embodiment, the lower limit setting ensures that the annular optical defocus zone has sufficient area to form a continuous and stable myopic defocus signal, inhibiting axial elongation. At the same time, the upper limit setting prevents the annular optical defocus zone from excessively crowding the optical correction zone, improving the clarity of the central field of vision and reducing peripheral aberrations and visual interference.

[0057] In one possible implementation, the radius of the defocus lens 1 is adjusted to fit the user's pupil size. and the radius of the circular optical correction area 120 satisfy: , .

[0058] The outer radius of the six annular optical defocus zones from the center to the edge of defocus lens 1 , , , , , satisfy: , , , , , .

[0059] To further improve visual quality, the outer radius of the six annular optical defocus zones extending from the center to the edge of defocus lens 1 is... , , , , , satisfy: , or , or , or , or , or .

[0060] In one possible implementation, to improve visual quality, slow myopia progression, and enhance wearing experience, the defocus amount Df and central refractive power D of the annular optical defocus zone satisfy the following: .

[0061] In one specific embodiment, the myopia defocusing amount of each of the six annular optical defocusing zones (first annular optical defocusing zone 131 to sixth annular optical defocusing zone 136) is +3.50D. The diameter of the defocusing lens 1 is 14.2mm, the radius of the first annular optical defocusing zone 131 is 1.6mm, the radius of the second annular optical defocusing zone 132 is 2.5mm, the radius of the third annular optical defocusing zone 133 is 3.5mm, the radius of the fourth annular optical defocusing zone 134 is 4.65mm, the radius of the fifth annular optical defocusing zone 135 is 5.6mm, and the radius of the sixth annular optical defocusing zone 136 is 6.5mm.

[0062] In one possible implementation, the height of the defocus lens 1 satisfies the aspherical equation.

[0063] The aspherical equation is used to calculate the surface profile sag of defocus lens 1, which can more accurately control the change in the curvature of the lens surface. This reduces optical interference caused by abrupt changes in the lens surface profile, and wearing this lens avoids changes in the total spherical aberration of the human eye, thus improving visual quality. At the same time, it optimizes the tear film distribution, improves the fit between the lens and the cornea, reduces dryness and foreign body sensation during wear, and improves wearing comfort.

[0064] Specifically, in one possible embodiment, the circular optical correction area, the annular optical correction area, and the annular optical defocus area are all designed using aspherical equations. The optical power is changed by altering the aspherical coefficient and curvature. The sag of the circular optical correction area and the annular optical correction area satisfies the following formula (5):

[0065] ...Formula (5)

[0066] in, The sag of the circular optical correction zone and the annular optical correction zone. It is the reciprocal of the radius of curvature of the basic spherical surface for both circular and annular optical correction zones. Let Z be the perpendicular distance from any point on the circular or annular optical correction area to the coordinate axis Z. Let Z be the horizontal distance from any point on the circular or annular optical correction area to the coordinate axis Z. It is the conic coefficient, i.e., the aspheric coefficient.

[0067] The sagitta of the annular optical defocus zone satisfies the following formula (6):

[0068] ...Formula (6)

[0069] in, The sag of the annular optical defocus zone. It is the reciprocal of the radius of curvature of the basic spherical surface of the annular optical defocusing region. Let Z be the perpendicular distance from any point on the annular optical defocus zone to the coordinate axis Z. Let Z be the horizontal distance from any point on the annular optical defocus zone to the coordinate axis Z. It is the conic coefficient, i.e., the aspheric coefficient.

[0070] The aforementioned radius of curvature is obtained by using the equation for the radius of curvature used in optics to describe a refractive surface. The radius of curvature is calculated using the following formula (7):

[0071] ...Formula (7)

[0072] in, It is the radius of curvature of the defocused lens surface, i.e. , For the aforementioned or , This is a parameter related to the surface shape of the defocused lens; here it represents the mirror height at any point on the defocused lens. It is the center thickness of the defocused lens, which affects the curvature of the front surface of the defocused lens. It is the radius of curvature of the back surface. The refractive index of air, is the refractive index of the material of the defocused lens.

[0073] The front surface here refers to the side of the defocus lens closest to the image side, that is, the side that is in direct contact with the cornea of ​​the eye, while the rear surface refers to the side of the defocus lens closest to the object side.

[0074] Based on the annular optical defocusing areas (first annular optical defocusing area 131-sixth annular optical defocusing area 136) with different positions in the defocusing lens 1, the height of the set optical correction area and the height of the annular optical defocusing area are substituted into the aforementioned radius of curvature equation, that is, the aforementioned formula (7), and the curvature of the corresponding annular optical defocusing area (first annular optical defocusing area 131-sixth annular optical defocusing area 136) and optical correction area (circular optical correction area 120 and first annular optical correction area 121-sixth annular optical correction area 126) can be obtained.

[0075] In one possible implementation, adjacent optical correction zones and annular optical defocus zones satisfy a cosine function. That is, the annular optical defocus zone and the optical correction zone are smoothly connected by a cosine function, ensuring the continuity of the defocus lens surface and minimizing astigmatism, thereby improving visual quality and slowing the progression of myopia.

[0076] Specifically, before substituting the heights of the optical correction zone and the annular optical defocus zone into the curvature equation, a cosine function can be set to smooth the heights of the optical correction zone and the annular optical defocus zone, thus determining the mirror height at any position on the defocused lens. The following formula (8) must be satisfied:

[0077] ...Formula (8)

[0078] in, The height of the mirror surface at any point on the defocusing lens. The height of the optical correction zone. The height of the annular optical defocus zone. This is the radial boundary (unit: mm) between the optical correction zone and the transition zone, i.e., the lower limit of the interval. This represents the radial boundary (unit: mm) between the transition zone and the annular optical defocus zone, i.e., the upper limit of the interval. , Pi is a constant.

[0079] Substituting the smoothed mirror height using the cosine function of formula (8) into the curvature calculation equation, i.e., the aforementioned formula (7), the continuous curvature distribution between the optical correction zone and the annular optical defocus zone can be derived. Finally, substituting this continuous curvature into the aspherical equation, i.e., the aforementioned formulas (5) and (6), the design of a defocus lens with smooth optical power transition characteristics can be obtained.

[0080] In another possible embodiment, the circular optical correction area and the annular optical correction area are designed using aspherical equations, and the annular optical defocus area is designed using circular arc functions. The sag heights of the circular optical correction area and the annular optical correction area satisfy the aforementioned formula (5). The sag height of the annular optical defocus area satisfies the following formula (9):

[0081] ...Formula (9)

[0082] in, The sag of the annular optical defocus zone. The radius of the outer circle of the annular optical defocus zone, as mentioned above. to either of them, Let Z be the perpendicular distance from any point on the annular optical defocus zone to the coordinate axis Z. Let Z be the horizontal distance from any point on the annular optical defocus zone to the coordinate axis Z. Let x be the x-coordinate of the center of the circular arc of the annular optical defocusing zone in the two-dimensional curve. y is the ordinate of the center of the circular arc of the annular optical defocusing zone in the two-dimensional curve.

[0083] This design applies the arc function to the annular optical defocus zone. Based on the width of the annular optical defocus zone involved in the design, arcs are designed at the endpoints of the two ends of the annular optical defocus zone. The center of the arc lies on the perpendicular bisector of the line connecting the two endpoints. By changing the radius of the arc, different center positions and arc shapes can be obtained. This allows for free modification of the defocus amount of the annular optical defocus zone, and the defocus amount of all six annular optical defocus zones can be modified simultaneously.

[0084] In one possible embodiment, the lens material of the defocus lens 1 is a highly oxygen-permeable silica hydrogel, and the water content of the defocus lens 1 is... and center thickness satisfy: , .

[0085] In this embodiment, a highly oxygen-permeable silicone hydrogel is used as the lens material, with a water content of not less than 50% and a center thickness d of not more than 0.1 mm. This improves the oxygen permeability of the lens, avoids discomfort such as corneal hypoxia and dry eyes, reduces the weight of the lens and the feeling of foreign objects in the eye, and improves the fit and comfort of wearing the lens, making it suitable for long-term, high-frequency wear.

[0086] Corresponding to the aforementioned defocus lens, this embodiment of the invention also provides a design method for a defocus lens, which provides a defocus lens 1 as described above. The defocus lens includes one circular optical correction area, N annular optical correction areas, and N annular optical defocus areas; N satisfies: The circular optical correction area is located at the optical center of the defocus lens; the N annular optical correction areas and the N annular optical defocus areas are alternately arranged radially outside the circular optical correction area; and the N annular optical correction areas, the N annular optical defocus areas, and the circular optical correction area are concentric; the ratio of the total area of ​​the annular optical defocus areas to the total area of ​​the defocus lens is... satisfy: The optical power of the circular optical correction area and the N annular optical correction areas are both first optical powers, and the optical power of the N annular optical defocus areas are both second optical powers, wherein the first optical power and the second optical power are different; the image-side focal points of the circular optical correction area and the N annular optical correction areas are... The image-side focal points of the N annular optical defocus zones satisfy: lie in Like a square.

[0087] This embodiment provides a defocusing lens comprising one circular optical correction area, N annular optical correction areas, and N annular optical defocusing areas, where N is a value between 5 and 7. The circular optical correction area is located at the optical center of the defocusing lens. The N annular optical correction areas and N annular optical defocusing areas are arranged alternately radially outward from the circular optical correction area and are concentric. The ratio of the total area of ​​the annular optical defocusing areas to the total area of ​​the defocusing lens is... The value ranges from 0.55 to 0.58. The optical power of the optical correction zone is always the first optical power, while the optical power of the optical defocus zone is always the second optical power. The first and second optical powers differ. The image-side focal points of the circular and annular optical correction zones are... Image focal point located in the annular optical correction zone The image is formed by multiple optical correction zones on the retina of the human eye to correct refractive errors. Multiple optical defocus zones are used to form an image in front of the retina to produce myopic defocus and slow down axial elongation. The optical correction zones of the first power and the optical defocus zones of the second power are arranged alternately. By controlling the area of ​​the optical correction zones and the optical defocus zones, a peripheral defocus effect is achieved, which improves visual quality and slows down the progression of myopia.

[0088] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0089] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0090] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A defocus lens, characterized in that, The defocus lens includes one circular optical correction area, N annular optical correction areas, and N annular optical defocus areas; N satisfies: ; The circular optical correction area is located at the optical center of the defocus lens; The N annular optical correction areas and the N annular optical defocus areas are arranged alternately on the radially outer side of the circular optical correction area; and the N annular optical correction areas, the N annular optical defocus areas, and the circular optical correction area are concentric. The ratio of the total area of ​​the annular optical defocusing region to the total area of ​​the defocusing lens satisfy: ; The optical power of the circular optical correction area and the N annular optical correction areas are both the first optical power, and the optical power of the N annular optical defocus areas are both the second optical power. The first optical power and the second optical power are different. The image focal points of the circular optical correction area and the N annular optical correction areas The image-side focal points of the N annular optical defocus zones satisfy: lie in Like a square.

2. The defocus lens according to claim 1, characterized in that, The height of the defocused lens satisfies the aspherical equation.

3. The defocus lens according to claim 1, characterized in that, The adjacent optical correction zone and the annular optical defocus zone satisfy a cosine function.

4. The defocus lens according to claim 1, characterized in that, The N satisfies: .

5. The defocus lens according to claim 4, characterized in that, The width of the annular optical defocusing zone satisfy: The width of the six annular optical defocus zones from the center to the edge of the defocused lens. , , , , , satisfy: , , , , , .

6. The defocus lens according to claim 4, characterized in that, The ratio of the total area of ​​the annular optical defocus zone to the total area of ​​the annular optical correction zone satisfy: .

7. The defocus lens according to claim 4, characterized in that, The defocusing amount Df and central refractive power D of the annular optical defocusing zone satisfy: .

8. The defocus lens according to claim 4, characterized in that, The radius R of the defocused lens and the radius of the circular optical correction area satisfy: , The outer radius of the six annular optical defocus zones from the center to the edge of the defocused lens. , , , , , satisfy: , , , , , .

9. The defocus lens according to claim 1, characterized in that, The defocus lens is made of highly oxygen-permeable silica hydrogel, and the water content of the defocus lens is... and center thickness satisfy: , .

10. A method for designing a defocus lens, characterized in that, The method includes: A defocusing lens is provided; wherein the defocusing lens includes one circular optical correction area, N annular optical correction areas, and N annular optical defocusing areas; N satisfies: The circular optical correction area is located at the optical center of the defocus lens; the N annular optical correction areas and the N annular optical defocus areas are alternately arranged radially outside the circular optical correction area; and the N annular optical correction areas, the N annular optical defocus areas, and the circular optical correction area are concentric; the ratio of the total area of ​​the annular optical defocus areas to the total area of ​​the defocus lens is... satisfy: The optical power of the circular optical correction area and the N annular optical correction areas are both first optical powers, and the optical power of the N annular optical defocus areas are both second optical powers, wherein the first optical power and the second optical power are different; the image-side focal points of the circular optical correction area and the N annular optical correction areas are... The image-side focal points of the N annular optical defocus zones satisfy: lie in Like a square.

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