Partitioned scattering optical lens for myopia control and design method thereof

Abstract

The invention discloses a partitioned scattering optical lens for myopia control and a design method of the partitioned scattering optical lens, which are applied to the technical field of optics, and aims to solve the problem that the central visual quality and the peripheral myopia control effect cannot be considered at the same time in the prior art, the optical lens comprises a central optical region, a peripheral optical region and a smooth transition zone, the central optical area is low in scattering coefficient and high in MTF, a high modulation transfer function and low scattering loss are achieved, the peripheral optical area is high in scattering coefficient and low in MTF, the central optical area is used for inducing peripheral myopic defocus, the smooth transition area is used for achieving continuous gradual change of the scattering coefficient, visual sudden change is avoided, and visual comfort is ensured. The design method comprises the steps of eye parameter acquisition, optical performance target definition, microstructure design and simulation optimization, through the scheme, effective decoupling of central vision and peripheral myopia control is achieved, high-definition vision is ensured, myopia progress is restrained, and wearing comfort is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical technology, in particular to a partitioned scattering optical lens for myopia control and a design method thereof. BACKGROUND

[0002] In recent years, the prevalence of myopia has shown a trend of increasing year by year worldwide, especially in children and adolescents. Myopia not only affects the quality of life of individuals, but also can cause a series of eye complications such as retinal detachment and macular degeneration, which can cause long-term and irreversible damage to visual health. Given the irreversibility of myopia progression, how to effectively control the occurrence and development of myopia has become one of the core focuses of research and application in the field of eye optics, and its importance is self-evident. In this context, in addition to traditional frame glasses and corneal contact lenses for correcting vision, innovative optical products that can actively intervene in myopia progression, especially optical lenses for myopia control, are increasingly attracting widespread attention and high expectations.

[0003] Under this technical background, contrast control type myopia prevention and control lenses emerged as the times require. The basic design principle of this kind of lenses is to introduce specific microstructures such as microlens arrays, micro-diffraction structures or scattering dot arrays on the surface of the lenses to induce specific optical defocus signals at the peripheral area of the retina, usually myopic defocus or positive spherical aberration, so as to inhibit the excessive growth of the eye axis. These microstructures can effectively change the clarity, contrast or spatial frequency distribution of retinal imaging by fine modulation of incident light, thereby providing signals to the eye biological accommodation system to inhibit myopia progression. In order to simplify the manufacturing process and ensure the coverage of optical function, early design schemes usually adopt the way of uniformly distributing the same microstructure on the entire lens surface to achieve light scattering and regulation. This uniform design strategy provides a new way for myopia prevention to some extent, breaks through the single category of traditional optical correction, marks the technical leap from passive vision correction to active vision intervention, and undoubtedly has a milestone significance for the development of technology at that time.

[0004] However, with the deepening understanding of myopia control mechanisms and the increasing demand for visual quality, some inherent characteristics of the above-mentioned uniform design gradually reveal its limitations in coping with new challenges, and the inherent contradictions become increasingly prominent. The root of the problem is that this homogenization design cannot balance the essential differences between the central and peripheral regions of the human eye's visual function. Specifically, the central macular region of the human eye requires extremely high visual imaging quality, as it is mainly responsible for fine vision, detail recognition, and color perception, and is extremely sensitive to image modulation transfer function (MTF), contrast, and brightness uniformity. Therefore, if a high scattering intensity (i.e., introducing high-density or high-curvature microstructures) is designed to ensure the peripheral myopia control effect, this high-intensity scattering will inevitably extend to the central vision area of the lens. In this area, excessive scattering will cause the incident light to diffuse, making the originally clear image unclear and the contrast sharply decreased, which may induce annoying glare effects, severely affecting the wearer's visual clarity and comfort. For example, in daily activities such as reading, learning, or driving, which require high visual concentration and fine recognition, the deterioration of central vision will greatly reduce the user's visual experience, and even lead to the abandonment of wearing due to visual discomfort, seriously affecting treatment compliance.

[0005] On the contrary, if the optical scattering intensity of the entire lens is intentionally reduced to protect the quality of central vision and avoid blurring and glare in the central region, another equally serious problem will arise: the myopia control signal in the peripheral region will be greatly weakened due to insufficient scattering intensity. The reception and response of the peripheral retina of the human eye to the myopia control signal is a key link to inhibit the growth of the eye axis. If the defocus signal intensity in the peripheral region is insufficient or its spatial frequency characteristics do not meet the optimal requirements of biological intervention, the eye may not receive effective "stop growing" instructions, resulting in ineffective inhibition of myopia progression, and ultimately the myopia control effect of the lens fails to meet expectations, and the core treatment purpose will also be difficult to achieve. This "central clearness protection vs. peripheral control" contradiction is not a simple performance trade-off, but an inherent optical principle conflict of uniform design, i.e., the same optical parameter cannot meet the two completely different visual needs of central high resolution and peripheral biological intervention. The existing uniform design scheme has not effectively decoupled the central visual quality and peripheral control efficiency, resulting in an unavoidable internal tension between the two.

[0006] Therefore, the core technical challenge in the field of current myopia control optical lenses is how to provide sufficient and effective myopia control optical signals in the peripheral region while ensuring the best central vision quality, without sacrificing the performance of either. In other words, there is an urgent need for an optical design strategy that can effectively decouple central vision quality and peripheral control effectiveness to break through the performance bottleneck of existing homogenization design solutions, thereby improving the effectiveness of myopia prevention and control and the visual comfort of users. Therefore, how to construct a myopia control lens with partitioned optical performance and independently optimized optical characteristics in each region, while having a smooth visual transition, and the design method thereof, has become a key challenge and technical problem to be solved for those skilled in the art. SUMMARY

[0007] The core of the present application is to construct a center optical zone, a peripheral optical zone and a smooth transition zone with independently optimized optical characteristics on a single lens, thereby effectively decoupling the central vision clarity and the peripheral myopia control effect, solving the technical problem that the existing homogenization design scheme cannot balance the central vision quality and the peripheral myopia control effect. At the same time, the unique design method provides a systematic and precise approach to realizing this partitioned optical lens, and through multi-parameter optimization and iterative simulation, the overall optical performance of the lens is ensured to meet the clinical requirements and the wearer's experience.

[0008] To solve the above problems, the technical scheme adopted by the present application is as follows.

[0009] A partitioned scattering optical lens for myopia control, comprising the following structures: an optically transparent lens substrate; a center optical zone arranged in the geometric center region of the lens substrate, with a diameter ranging from 4.0 mm to 8.0 mm, an optical scattering coefficient of the center optical zone being lower than 0.1, and a modulation transfer function value at a spatial frequency of 30 cycles / mm being higher than 0.6; a peripheral optical zone in the form of a ring structure surrounding the center optical zone and extending to the edge region of the lens substrate, the optical scattering coefficient of the peripheral optical zone being higher than 0.5, and the modulation transfer function value at a spatial frequency of 30 cycles / mm being lower than 0.2; a smooth transition zone in the form of a ring structure arranged between the center optical zone and the peripheral optical zone, the smooth transition zone providing a continuous gradual change in the scattering coefficient from the center optical zone to the peripheral optical zone.

[0010] Further, the lens substrate is made of an ophthalmic grade optical material; the lens substrate has a refractive index of 1.49 to 1.67, an Abbe number not less than 30, and a light transmittance not less than 98% in the visible light spectrum; the lens substrate has a front surface and a back surface, and the central optical zone, the peripheral optical zone, and the smooth transition zone can be provided on the front surface, the back surface, or both the front surface and the back surface of the lens substrate.

[0011] Further, the central optical zone adopts an aspheric surface or a free-form surface design, and the surface of the central optical zone is a smooth optical surface, which adopts any one of the following two design methods: 1. does not contain any microstructure for actively scattering light, and 2. contains only nanoscale pseudo-random textures with a height or depth of less than 10 nanometers, wherein the average period of the pseudo-random textures is less than the wavelength of visible light.

[0012] Further, the peripheral optical zone contains a regularly arranged microlens array, which is used to induce a preset amount of myopic defocus signal at the peripheral retina, the type of the microlens array includes spherical microlenses, aspheric microlenses, or annular microlenses, the average diameter of the microlens array ranges from 20 micrometers to 200 micrometers, the average height or depth ranges from 5 micrometers to 50 micrometers, and the center-to-center distance of the microlens array ranges from 50 micrometers to 300 micrometers, the layout of the microlens array is a hexagonal close-packed array or a square grid array, the refractive power of the microlens array is designed to induce a myopic defocus ranging from +1.5 diopters to +4.0 diopters at the peripheral retina, and the density of the microlens array in the peripheral optical zone is higher than 200 / mm2.

[0013] Further, the width of the smooth transition zone ranges from 0.5 millimeters to 2.0 millimeters; the smooth transition zone achieves a smooth transition of the scattering coefficient by continuous and gradual changes in the microstructure parameters, including the height, diameter, curvature, density, or combination thereof of the microlens array. In the smooth transition zone, the height of the microlens array continuously increases from a near-zero value near the central optical zone to a set value near the peripheral optical zone, the density of the microlens array continuously increases from sparse distribution or zero distribution near the central optical zone to high-density distribution near the peripheral optical zone, the curvature radius of the microlens array continuously decreases from a larger value near the central optical zone to a smaller value near the peripheral optical zone, the scattering coefficient of the smooth transition zone continuously and monotonically increases from less than 0.1 to more than 0.5, the modulation transfer function value of the smooth transition zone continuously and monotonically decreases from more than 0.6 to less than 0.2 at 30 cycles / mm spatial frequency, and the defocus amount of the smooth transition zone continuously and monotonically increases from 0 diopters to a range of +1.5 diopters to +4.0 diopters.

[0014] A design method of a zoned scattering optical lens for myopia control, and a method for manufacturing the zoned scattering optical lens, comprising the following steps: Step one: obtaining basic eye parameters and refractive data of the wearer; Step two: defining the optical performance target of the central optical zone, setting the effective diameter range of the central optical zone to be 4.0mm to 8.0mm, setting the modulation transfer function value of the central optical zone at 30 cycles / mm spatial frequency to be not less than 0.6, and the optical scattering coefficient to be not higher than 0.1, and designing the central optical zone as a smooth optical surface; Step three: defining the optical performance target of the peripheral optical zone, setting the peripheral optical zone to surround the central optical zone, the target value of the optical scattering coefficient of the peripheral optical zone to be not less than 0.5, and the modulation transfer function value at 30 cycles / mm spatial frequency to be not higher than 0.2, and setting the peripheral optical zone to induce a myopic defocus in the range of +1.5D to +4.0D at the peripheral retina by introducing a microlens array; Step four: designing the parameters of the microlens array in the peripheral optical zone, the average diameter of the microlens array ranging from 20μm to 200μm, the average height or depth ranging from 5μm to 50μm, and the center-to-center spacing ranging from 50μm to 300μm; Step five: designing the gradient parameters of the microlens array in the smooth transition zone, setting the width of the smooth transition zone to range from 0.5mm to 2.0mm, and selecting a gradient function to describe the spatial distribution of at least one of the microlens array height or density; Step six: constructing a three-dimensional optical model and performing optical performance simulation, inputting the optical power of the lens base and the geometric and optical parameters of the central optical zone, the peripheral optical zone and the smooth transition zone into the optical design software, simulating the light propagation path by ray tracing, and calculating the modulation transfer function, point spread function, optical defocus amount and scattering coefficient of the lens at different spatial frequencies; Step seven: iteratively optimizing according to the simulation results obtained in step six, evaluating whether the preset central visual clarity, peripheral myopia control defocus amount and visual comfort requirements are met, if not, adjusting the geometric parameters, microstructure parameters and gradient function of the central optical zone, the peripheral optical zone or the smooth transition zone, and repeating step six until all performance targets are met; Step eight: generating manufacturing data, generating numerical control machining instructions, photolithography mask pattern or mold design file for lens manufacturing according to the finally determined optical design parameters.

[0015] Further, the basic eye parameters in step one include axial length, corneal curvature, anterior chamber depth, lens thickness and pupil diameter, and the refractive data includes the spherical power, cylindrical power and axis of the wearer.

[0016] Further, the basic eye parameters in step one also include wavefront aberration data of the eyeball, which is obtained by a Hartmann-Shack wavefront sensor and used to guide the freeform or aspheric design of the lens base.

[0017] Further, the layout of the microlens array in step four is a hexagonal close-packed array, and the material of the microlens array is consistent with that of the lens base.

[0018] Further, the gradient function in step five is a cubic polynomial function or a Sigmoid function, and the height of the microlens array continuously increases from zero or near zero near the boundary of the central optical zone to a set value near the boundary of the peripheral optical zone, and the density of the microlens array continuously increases from zero or near zero near the boundary of the central optical zone to a set value near the boundary of the peripheral optical zone.

[0019] Further, the measurement or simulation method of the optical scattering coefficient includes: using an optical scattering measurement system to measure the backscattering intensity of the lens at a wavelength of 550 nanometers and converting it into a scattering coefficient.

[0020] Further, the measurement or simulation method of the modulation transfer function includes: using an optical quality evaluation method to measure or simulate the modulation transfer function value at a spatial frequency of 30 cycles / mm in the central optical zone, the peripheral optical zone and the smooth transition zone, respectively, and the calculation of the modulation transfer function value is based on the Fourier transform of the point spread function or the line spread function.

[0021] Compared with the prior art, the advantages of the present application are: The present scheme realizes effective decoupling of central visual clarity and peripheral myopia control effect by constructing a central optical zone, a peripheral optical zone and a smooth transition zone with independent optimized optical properties on a single lens. The central optical zone ensures a high-definition experience for the wearer during fine visual activities through its extremely low scattering coefficient and high MTF value. The peripheral optical zone generates a preset myopic defocus signal at the peripheral retina by introducing a microlens array with specific parameters, thereby effectively inhibiting the excessive growth of the eye axis. The smooth transition zone ensures smooth visual transition from the center to the periphery through the continuous gradient of the microstructure parameters, greatly improving the comfort and compliance of the wearer. In the design process, multi-parameter optimization and iterative simulation are used to ensure that the overall optical performance of the lens meets the clinical needs and wearer experience. This scheme breaks through the limitations of traditional uniform design and provides an innovative and efficient technical solution for the field of myopia prevention and control. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Structure diagram of the optical lens of the present application Figure One ; Figure 2 Structure diagram of optical lens of the present application Figure Two Figure 3 Structure diagram of microlens array in peripheral optical zone of the present application Figure 4 Structure diagram of gradual change of microlens array parameters in smooth transition zone of the present application Figure 5 Flow chart of design method of the present application Figure 6 Data comparison chart of examples and comparative examples of the present application

[0023] Explanation of figure numbers: 1, lens substrate; 2, central optical zone; 3, peripheral optical zone; 4, smooth transition zone; 5, microlens array; 6, front surface; 7, back surface. DETAILED DESCRIPTION

[0024] The technical solutions will be described clearly and completely below in combination with the drawings in the embodiments of the present application.

[0025] Please refer to Figure 1 A zoned scattering optical lens for myopia control comprises an optically transparent lens substrate 1, a central optical zone 2 is arranged in the geometric center area of the lens substrate 1, the central optical zone 2 is circular, a peripheral optical zone 3 is arranged around the outside of the central optical zone 2, the peripheral optical zone 3 is annular structure and extends to the edge area of the lens substrate 1, a smooth transition zone 4 is ingeniously arranged between the central optical zone 2 and the peripheral optical zone 3, the smooth transition zone 4 is also annular structure, and its main function is to realize the continuous gradual change of optical properties from the central optical zone 2 to the peripheral optical zone 3.

[0026] As shown in Figure 2 , the lens substrate 1 has a front surface 6 and a back surface 7, the zoned scattering structure formed by the central optical zone 2, the peripheral optical zone 3 and the smooth transition zone 4 can be arranged on the front surface 6, the back surface 7 or both the front surface 6 and the back surface 7 of the lens substrate 1 according to actual design requirements and manufacturing process limitations. For example, in a typical design, the zoned scattering structure can be integrally formed on the front surface 6 of the lens substrate 1 to optimize the wearing comfort and simplify the manufacturing process.

[0027] ​As a preferred embodiment of the present application, the lens substrate 1 is composed of an ophthalmic-grade optical material to ensure excellent biocompatibility and optical transparency, the type of material is selected widely, which can include but is not limited to polymethyl methacrylate (PMMA), diethylene glycol bisacrylate carbonate (CR-39), polycarbonate (PC) or high refractive index hydrogel material, PMMA material is known for its excellent optical clarity, hardness and dimensional stability, commonly used in hard contact lenses or high-precision optical elements, CR-39 material is a common choice for spectacle lens manufacturing due to its light weight, impact resistance and excellent Abbe number, polycarbonate material is known for its extremely high impact resistance, suitable for scenes with high safety protection requirements, and high refractive index hydrogel material is commonly used in soft contact lenses, which can significantly improve the wearing comfort due to its high oxygen permeability, softness and hydrophilicity. The refractive index of the lens substrate 1 can be set to be between 1.49 and 1.67, and the material in this range can provide appropriate lens thickness and curvature design for different diopter numbers, while optimizing the optical performance. For example, a material with a refractive index of 1.56 is commonly used for moderate diopter correction. The Abbe number of the material is not less than 30 to effectively control the dispersion phenomenon and ensure the clarity of vision. In the visible light spectrum (380 nm to 780 nm), the transmittance of the lens substrate 1 is not less than 98%, which ensures sufficient light flux to reach the retina and avoids brightness loss caused by lens absorption. In addition, the lens substrate 1 is designed with a specific base curve and optical power according to the refractive error of the wearer to achieve spherical, cylindrical or more complex refractive correction functions.

[0028] The central optical zone 2 is designed to achieve high modulation transfer function (MTF) and low scattering loss to ensure that the wearer can obtain high-definition central vision when performing fine visual activities such as reading, driving, etc., and the diameter of the central optical zone 2 is in the range of 4.0 mm to 8.0 mm, which is usually determined by considering the average pupil diameter of the wearer and the pupil dilation limit under different environmental light conditions, especially the physiological dilation of the pupil at night, to ensure that the light entering the pupil mainly passes through this high-definition area under any light conditions, thereby maintaining the clarity of the core vision. The modulation transfer function (MTF) of the central optical zone 2 at 30 cycles per millimeter (cpd) spatial frequency is designed to be higher than 0.6, which indicates that this area can accurately transmit subtle visual information with high contrast. At the same time, the optical scattering coefficient of this area is strictly controlled at a level lower than 0.1, which means that the light passing through this area is scattered very little, minimizing the occurrence of adverse visual phenomena such as halos, glare, etc.

[0029] As a preferred embodiment of the present application, the surface of the central optical zone 2 is designed as a smooth optical surface, whose surface morphology does not contain any microstructure for actively scattering light, however, in some specific embodiments, the surface can contain nanoscale pseudo-random textures with height or depth less than 10 nanometers, the introduction of these nanoscale pseudo-random textures is not for active scattering, but aims to further reduce scattering loss and improve light transmittance through surface energy regulation or anti-reflective / anti-reflection effect. The average period of the pseudo-random textures is usually less than the wavelength of visible light (e.g. less than 200 nanometers), so as to effectively avoid producing diffraction effect or significant optical scattering, ensuring that the optical performance of this area is not affected. The central optical zone 2 is designed by precise curved surface, for example, using aspherical or free-form surface design, to minimize high-order aberrations and optimize retinal imaging quality, with a micro root mean square (RMS) wavefront aberration usually controlled below 0.05 microns at a 5 millimeter pupil diameter, such a very low wavefront aberration ensures that light can be highly focused on the retina, thereby providing excellent visual acuity.

[0030] The peripheral optical zone 3 is annular in structure and surrounds the central optical zone 2 and extends to the edge region of the lens base 1, the core design goal of this peripheral optical zone 3 is to induce the generation of effective peripheral myopic defocus signals, so as to inhibit the excessive growth of the eye axis, achieving the purpose of myopia control, in this area, the design target of the optical scattering coefficient is higher than 0.5, which indicates that this area will produce significant light scattering, thereby forming diffuse imaging, at the same time, the modulation transfer function (MTF) design target at 30 cycles per millimeter (cpd) spatial frequency is lower than 0.2, which further indicates that the imaging quality of this area is intentionally reduced to generate effective defocus signals.

[0031] As a preferred embodiment of the present application, the peripheral optical zone 3 contains a regularly arranged microlens array 5, such as Figure 3As shown, the microlens array 5 is the key structure to induce peripheral myopic defocus signals, and the microlens array 5 can be of various types, including spherical microlenses, aspheric microlenses, or annular microlenses, with the specific selection depending on the required defocus amount distribution and manufacturing process. The microlens array 5 has an average diameter ranging from 20 microns to 200 microns, an average height or depth ranging from 5 microns to 50 microns, and a center-to-center spacing (i.e., array pitch) ranging from 50 microns to 300 microns. Precise control of these geometric parameters is essential to achieve the preset defocus effect. The microlens array 5 can be arranged in a hexagonal close-packed array or a square grid array, with the hexagonal close-packed array generally providing higher packing density and more uniform optical effects. The refractive power of the microlens array 5 is carefully designed to induce a myopic defocus of +1.5 diopters to +4.0 diopters on the peripheral retina, which has been clinically proven to be effective in inhibiting axial elongation. The microlens array 5 in the peripheral optical zone 3 has a density of more than 200 per square millimeter. Such a high-density, high-curvature microlens array 5 can form diffuse optical imaging on the peripheral retina by locally converging and scattering incident light, thereby providing a biological signal to the eyeball to inhibit the progression of myopia. The design parameters of the peripheral optical zone 3 are optimized by simulation using an eyeball biological model that takes into account the anatomical structure, optical properties, and physiological response mechanisms of the eyeball to ensure that the strength, spatial frequency, and distribution characteristics of the defocus signals generated meet the biological mechanisms of myopia control.

[0032] The smooth transition zone 4 is annular in structure and is disposed between the central optical zone 2 and the peripheral optical zone 3. The core function of the smooth transition zone 4 is to provide a continuous and gradual change in the scattering coefficient from the central optical zone 2 to the peripheral optical zone 3 to avoid visual discontinuity and ensure visual comfort. The width of the smooth transition zone 4 ranges from 0.5 mm to 2.0 mm, which is an optimized choice that provides sufficient transition space without occupying too much lens area.

[0033] As a preferred embodiment of the present application, the smooth transition zone 4 achieves a smooth transition in the scattering coefficient by a continuous and gradual change in the microstructure parameters, which can include the height, diameter, curvature, density, or combination thereof of the microlenses. Specifically, as shown in FIG. 2, the smooth transition zone 4 can be designed to gradually change the height of the microlenses, the diameter of the microlenses, or the combination thereof. Figure 4As shown, within the smooth transition zone 4, the height of the microlenses can continuously increase from near-zero value near the central optical zone 2 to a set value near the peripheral optical zone 3, or the density of the microlenses can continuously increase from sparse distribution or zero distribution near the central optical zone 2 to high-density distribution near the peripheral optical zone 3, or the radius of curvature of the microlenses can continuously decrease from a larger value near the central optical zone 2 to a smaller value near the peripheral optical zone 3, the gradient function of these parameters can be in various mathematical forms, such as linear function, quadratic function, power function, Sigmoid function or polynomial function, among which cubic polynomial function or Sigmoid function is often used to achieve a more smooth and natural transition effect, the gradient function ensures that the wearer will not perceive obvious visual boundaries when scanning the line of sight, thereby maintaining good visual comfort and treatment compliance, the scattering coefficient of the smooth transition zone 4 continuously and monotonically increases from below 0.1 to above 0.5 in the transition area, at the same time, the MTF value of the smooth transition zone 4 continuously and monotonically decreases from above 0.6 to below 0.2 at a spatial frequency of 30 cycles per millimeter (cpd), accordingly, the defocus amount of the smooth transition zone 4 continuously and monotonically increases from 0 diopter to a range of +1.5 diopter to +4.0 diopter, thereby achieving seamless connection from clear central vision to effective peripheral defocus.

[0034] The present application also provides a design method for a partitioned scattering optical lens for myopia control, which ensures the accurate implementation of the optical performance of the lens through systematic steps, please refer to Figure 5 The design method comprises the following steps: Step one: obtaining the basic eye parameters and refractive data of the wearer; This step is the basis for personalized design of the lens, the basic eye parameters include but are not limited to axial length, corneal curvature (such as K value), anterior chamber depth, lens thickness and pupil diameter, these parameters are accurately measured by ophthalmic diagnostic equipment (such as IOLMaster 700 or Pentacam), the refractive data includes the spherical power, cylindrical power and axis of the wearer, these data are obtained through the optometry and lens fitting process, further, in order to achieve higher level of personalized aberration correction, the wavefront aberration data of the eyeball can also be obtained in this step, the wavefront aberration data is measured by Hartmann-Shack wavefront sensor and expressed in the form of Zernike coefficients, these wavefront aberration data will be directly used to guide the design of the free-form surface or aspherical surface of the lens base 1, to ensure that while correcting refractive errors, the influence of high-order aberrations on retinal clarity is minimized, especially in the central optical zone 2.

[0035] Step two: defining the optical performance target of the central optical zone 2; According to the average pupil diameter of the wearer and the actual demand for fine vision obtained in step one, the effective diameter range of the central optical zone 2 is set to 4.0 mm to 8.0 mm, which is usually slightly larger than the pupil diameter of the wearer in normal light to accommodate slight movement of the pupil and changes in ambient light, and the modulation transfer function (MTF) target value of the central optical zone 2 at a spatial frequency of 30 cycles per millimeter (cpd) is set to not less than 0.6 to ensure sufficient contrast and detail resolution, and at the same time, the optical scattering coefficient target value is set to not higher than 0.1 to minimize light scattering and improve visual clarity. The central optical zone 2 is defined as a smooth optical surface in this design and does not contain any microstructure for active scattering, which is consistent with the low scattering coefficient target.

[0036] Step three: define the optical performance targets of the peripheral optical zone 3; The peripheral optical zone 3 is set to surround the central optical zone 2, and the optical scattering coefficient target value is set to not less than 0.5 to ensure that sufficient diffuse light is generated for the formation of peripheral defocus signals, and the MTF target value at a spatial frequency of 30 cycles per millimeter (cpd) is set to not higher than 0.2 to further confirm that the imaging quality of this area is lower than that of the central optical zone 2, which helps to generate effective myopic defocus. The peripheral optical zone 3 is set to induce a myopic defocus of +1.5 diopters to +4.0 diopters at the peripheral retina by introducing a microstructure array, and the amount of defocus is determined according to the effective myopia control interval based on biological research results and clinical experience.

[0037] Step four: design the microstructure parameters of the peripheral optical zone 3; In this step, lenticules are selected as the lenticular array 5, and the geometric parameters of the lenticules are precisely set: the average diameter is in the range of 20 microns to 200 microns, the average height or depth is in the range of 5 microns to 50 microns, and the center-to-center spacing is in the range of 50 microns to 300 microns. The layout of the lenticular array 5 is preferably a hexagonal close-packed array to achieve optical uniformity and high efficiency, and the material of the lenticules is consistent with the material of the lens base 1, which simplifies the manufacturing process and ensures the uniformity of the material. In order to accurately control the induced defocus amount, the radius of curvature of the lenticules, the center thickness, and the refractive index difference between the lenticules and the lens base material all need to be finely calculated, for example, for a base material with a refractive index of 1.56, if the target is to generate a peripheral defocus of +3.0D, the equivalent refractive power of a single lenticule and its cumulative effect in the array need to be verified through optical simulation.

[0038] Step five: design the microstructure gradient parameters of the smooth transition zone 4; The width of the smooth transition zone 4 is set to be in the range of 0.5mm to 2.0mm, and a suitable transition function (e.g. a cubic polynomial function, a Sigmoid function, or an exponential function) is chosen to describe the spatial distribution of the micro-lens height and / or density, the height of the micro-lens will continuously increase from zero (or close to zero, e.g. less than 1 micron) near the boundary of the central optical zone 2 to a set value (e.g. 20 microns) near the boundary of the peripheral optical zone 3, while the density of the micro-lens will continuously increase from zero distribution (or sparse distribution, e.g. 50 / mm2) near the boundary of the central optical zone 2 to a high density distribution (e.g. 300 / mm2) near the boundary of the peripheral optical zone 3, these transition functions, through precise control, ensure that the scattering coefficient, MTF value and defocus amount in the smooth transition zone 4 all achieve continuous and monotonous transition, thereby avoiding visual discomfort, for example, a cubic polynomial function can well simulate the smooth growth of the micro-lens height, its form can be expressed as h(r) = A * (r / W)^3 + B * (r / W)^2 + C * (r / W) + D, where r is the distance to the boundary of the central zone, W is the width of the transition zone, A, B, C, D are undetermined coefficients, which are determined by boundary conditions (e.g. the height at r=0 is h_start, the height at r=W is h_end, and the gradient is continuous at the boundary).

[0039] Step six: build a three-dimensional optical model and perform optical performance simulation; The optical power of the lens base 1, the geometry and optical parameters of the central optical zone 2, the peripheral optical zone 3 and the smooth transition zone 4 are input into professional optical design software, such as Zemax OpticStudio, Code V or LightTools. In the simulation environment, a three-dimensional geometric model of the entire lens is accurately constructed, including the precise shape and spatial position of each micro-lens. By tracing the incident light rays at different field angles (e.g. 0 degrees, 10 degrees, 20 degrees, 30 degrees), the propagation path of the light rays inside the lens and the imaging characteristics on the retina are simulated. During the simulation process, the ray tracing algorithm takes into account the refractive index, Abbe number of the lens material, and the diffraction and scattering effects caused by the microstructure, calculates the modulation transfer function (MTF), point spread function (PSF), optical defocus amount and scattering coefficient of the lens at different spatial frequencies, for example, the MTF curves can be calculated for the central field and the peripheral field respectively, and the shape and size of the PSF are analyzed to evaluate the imaging quality and defocus effect.

[0040] Step seven: iterative optimization according to the simulation results; In-depth analysis of the optical performance data obtained in Step Six is performed to assess whether the pre-set requirements for central vision clarity, peripheral myopia control defocus, and visual comfort are met. For example, if the MTF value of the central optical zone 2 is lower than the target, the surface aspheric coefficients or nano-texture parameters of the central optical zone 2 may need to be adjusted; if the defocus of the peripheral optical zone 3 is insufficient, the height or curvature of the microlenses may need to be increased; if the MTF or scattering coefficient of the smooth transition zone 4 is not continuous, the wearer may perceive a visual jump, in which case the type or parameters of the gradient function need to be adjusted; if the evaluation results are not up to standard, the geometric parameters, microstructure parameters, and gradient function of the central optical zone 2, peripheral optical zone 3, or smooth transition zone 4 need to be adjusted in detail, and Step Six is repeated until all performance targets are met. The iterative optimization process aims to find the best balance point among multiple interrelated optical performance indicators through a multivariate optimization algorithm (such as genetic algorithm, simulated annealing algorithm, or gradient descent method), ultimately achieving the minimization of scattering and aberration in the central region, the maximization of effective defocus signal in the peripheral region, and the continuity of vision through the smooth transition zone 4.

[0041] Step Eight: Generating Manufacturing Data According to the final determined optical design parameters, numerical control machining instructions (such as G code for ultra-precision diamond turning or free-form surface grinding), photolithography mask plate file, or mold design file are generated for lens manufacturing. These data files accurately describe the geometry, size, and spatial position of all microstructures on the lens surface, which is the key to high-precision manufacturing. For example, for the ultra-precision diamond turning process, the G code will precisely control the motion trajectory of the diamond tool on the lens mold to carve the microlens array 5 and the gradient structure of the smooth transition zone 4 with sub-nanometer precision.

[0042] The optical scattering coefficient measurement method of the central optical zone 2 and the peripheral optical zone 3 is as follows: an optical scattering measurement system conforming to international standard ISO13666 is used to measure the backscattering intensity of the lens at a wavelength of 550 nanometers (central wavelength of visible light) and convert it into a scattering coefficient. The system usually includes a high-precision spectrometer, a tunable laser light source, and a high-sensitivity detector, and data is obtained through an integrating sphere or angle-resolved scattering measurement technology.

[0043] The measurement or simulation method of the modulation transfer function (MTF) is as follows: an optical quality evaluation method conforming to international standard ISO 11979-9 is used to measure or simulate the MTF value at a specific spatial frequency (such as 30 cycles per millimeter) in the specified area (central optical zone 2, peripheral optical zone 3) of the lens. MTF measurement is usually completed by measuring the imaging ability of the lens on a sinusoidal grating or edge response, and the value is calculated based on the Fourier transform of the point spread function (PSF) or line spread function (LSF).

[0044] As a preferred embodiment of the present application, the accuracy of the design parameters of the smooth transition zone 4 can also be further verified by computational fluid dynamics (CFD) or finite element analysis (FEA) methods, for example: in the ultraviolet nanoimprint process, FEA can simulate the flow and filling behavior of liquid resin in the mold microstructure to predict the degree of accurate replication of the microstructure geometry after curing. CFD analysis can be used to optimize the mold design to ensure uniform resin filling and avoid air bubbles or underfilling. These analyses aim to ensure the accurate replication of microstructure geometry and the stability of surface topography during lens material processing. The design method can also include biomechanical analysis of the wearer's head and eye movement patterns, for example: by collecting data through an eye tracking system, analyzing the rotation center and line of sight of the wearer's eye under different fields of view, in order to consider the dynamic visual environment in lens design and further optimize the optical performance under different fields of view, ensuring that the line of sight always passes through the design area and the defocus signal is stable and effective during eye movement.

[0045] As a preferred embodiment of the present application, the manufacturing process of the microlens array 5 is selected from a variety of options, including but not limited to ultra-precision diamond turning, ultraviolet nanoimprint, interference lithography or direct laser writing technology. Ultra-precision diamond turning technology precisely controls the tool path through a numerical control machine tool to form a microlens array 5 directly on the mold surface or lens substrate. This method has high precision and is suitable for the machining of aspherical and free-form surface structures. Ultraviolet nanoimprint technology involves pressing a mold containing a microstructure pattern onto a liquid resin coating under ultraviolet light, and then forming a microstructure after the resin is cured. This method is efficient and relatively low in cost, making it suitable for mass production. Interference lithography technology forms periodic microstructures on photosensitive materials through the interference pattern of two or more coherent lasers, making it suitable for manufacturing high-precision, large-area periodic structures. Direct laser writing technology involves scanning the surface of photosensitive materials point by point or line by line with a focused laser beam to achieve precise machining of microstructures. This technology has high design flexibility and can manufacture any complex structure, making it particularly suitable for prototype development and small batch production.

[0046] The technical solutions of the present application and their effects will be further illustrated through specific examples and comparative examples: Example One: Zoned Scattering Optical Lens (Invention) The design parameters of the zoned scattering optical lens constructed in this example are as follows: Lens substrate 1: CR-39 material is selected, with a refractive index of 1.498, an Abbe number of 58, a visible light transmittance of 98.5%, and a power design of -3.00D spherical surface with a base curve of 8.5mm; Central optical zone 2: diameter set as 6.0 mm, surface designed as a smooth aspheric surface, high order aberration reduced by Zernike coefficients optimization, micro root mean square (RMS) wavefront aberration controlled at 0.035 microns at 5 mm pupil diameter, this zone contains no active scattering microstructures, the target optical performance is: MTF higher than 0.7 at 30 cycles per millimeter (cpd) spatial frequency, optical scattering coefficient lower than 0.08; Peripheral optical zone 3: annular structure, extending from the boundary of central optical zone 2 to the lens diameter of 30 mm, this zone contains a microlens array 5, the microlens array 5 adopts aspheric microlenses with an average diameter of 80 microns, an average height of 25 microns, and a center-to-center distance of 150 microns, arranged in a hexagonal close-packed array, the refractive power of each microlens is designed to induce a peripheral retinal of +3.0 diopters of myopic defocus. The microlens density is 462 per square millimeter. The target optical performance of this zone is: MTF lower than 0.15 at 30 cycles per millimeter (cpd) spatial frequency, optical scattering coefficient higher than 0.6; Smooth transition zone 4: width set as 1.5 mm, located between the central optical zone 2 and the peripheral optical zone 3, the height and density of the microlens array 5 in the smooth transition zone 4 gradually change using a cubic polynomial function, the height of the microlens array 5 continuously increases from 0 microns (no microlens) at the boundary of the central optical zone 2 to 25 microns at the boundary of the peripheral optical zone 3, and the density continuously increases from 0 per square millimeter at the boundary of the central optical zone to 462 per square millimeter at the boundary of the peripheral optical zone, in the smooth transition zone 4, the scattering coefficient continuously and monotonically increases from 0.08 to 0.6, the MTF continuously and monotonically decreases from 0.7 to 0.15, and the defocus amount continuously and monotonically increases from 0 diopters to +3.0 diopters.

[0047] Comparative Example One: Traditional single-vision optical lens This comparative example constructs a traditional single-vision optical lens, the parameters of which are designed as follows: Lens base: CR-39 material is selected, the refractive index is set as 1.498, the Abbe number is 58, the visible light transmittance is 98.5%, the lens power is designed as -3.00D spherical, and the base curve is 8.5 mm. The entire lens surface is designed as a smooth spherical or aspheric surface without any partition design, and does not contain microstructures for inducing peripheral defocus, aiming to provide optimal central vision correction in the full field of view, the optical performance target is: MTF higher than 0.7 at 30 cycles per millimeter (cpd) spatial frequency, optical scattering coefficient lower than 0.1.

[0048] Comparative Example Two: Uniform multifocal optical lens This comparative example constructs a uniform multifocal optical lens, the parameters of which are designed as follows: Lens base: CR-39 material is selected, the refractive index is set to 1.498, the Abbe number is 58, and the visible light transmittance is 98.5%. The lens power is designed as -3.00D spherical, and the base arc is 8.5mm. The entire lens area (including the center and the periphery) is uniformly distributed with a microlens array 5 for generating a multifocal effect, the average diameter of the microlens is 80 microns, the average height is 25 microns, the center distance is 150 microns, a hexagonal close-packed array layout is adopted, the density is 462 / mm2, and the refractive power of each microlens is designed to induce +3.0 diopters of myopic defocus on the peripheral retina. This design sacrifices part of the central visual clarity in order to achieve myopia control effect, but lacks smooth transition, and its optical performance is: the center area and the peripheral area both present MTF and scattering coefficient between the center optical zone and the peripheral optical zone, and the defocus amount is uniformly distributed.

[0049] In order to evaluate the performance of the above examples and comparative examples, we use the three-dimensional optical model and simulation method of step six to simulate the optical performance of the lens, and the simulation results are shown in Figure 6

[0050] From the data of Figure 6 It can be seen that: the zoned scattering optical lens provided by example one maintains a high MTF value and a low scattering coefficient in the center optical zone 2 similar to the traditional single-vision lens, ensuring excellent central vision, and the RMS wavefront aberration is also controlled at a very low level; compared with the uniform multifocal lens of comparative example two, the central MTF of example one is significantly higher and the scattering is lower, which means that the central visual quality is better, in the peripheral optical zone 3, example one successfully realizes high scattering coefficient and low MTF, and induces significant +3.1 diopters of myopic defocus, which is in sharp contrast to the no defocus effect of traditional single-vision lens, and is superior to the performance of peripheral defocus intensity of the uniform multifocal lens of comparative example two.

[0051] It is particularly worth noting that the smooth transition zone 4 of example one realizes the smooth transition of MTF, scattering coefficient and defocus amount through the continuous gradual change of microstructure parameters, which does not exist in the traditional single-vision lens of comparative example one, and in the uniform multifocal lens of comparative example two, due to the lack of special transition design, the optical properties often present nonlinearity and mutation between different areas, which may cause the wearer to perceive visual discomfort or image jumping when scanning the line of sight, and the comprehensive wearing comfort score of example one is 8.5, which is slightly lower than that of the traditional single-vision lens but significantly higher than that of the uniform multifocal lens, which verifies the key role of the smooth transition zone 4 in improving the wearing experience.

[0052] ​In terms of simulating the myopia progression inhibition rate, Example One shows an inhibition rate of 62%, which is significantly better than the 5% of the traditional single-focus lens (only the natural growth baseline) and the 35% of the uniform multi-focus lens, indicating that the zoned scattering optical lens designed by the application achieves the goal of maximizing myopia control without sacrificing core visual quality by precisely controlling the center high definition, the periphery effective defocus, and the smooth transition. The simulation results are based on a biophysical model that inputs parameters such as the intensity and spatial frequency distribution of the peripheral retinal defocus signal, combined with known biological mechanisms of axial growth, to make predictions.

[0053] Therefore, the zoned scattering optical lens for myopia control and its design method disclosed by the application achieve effective decoupling of the center visual clarity and the periphery myopia control effect by constructing the center optical zone 2, the periphery optical zone 3, and the smooth transition zone 4 with independent optimized optical properties on a single lens. The center optical zone 2 ensures a high-definition experience for the wearer during fine visual activities through its extremely low scattering coefficient and high MTF value. The periphery optical zone 3 generates a preset myopic defocus signal at the peripheral retina by introducing a microlens array 5 with specific parameters, effectively inhibiting the excessive growth of the eye axis. The smooth transition zone 4 ensures a smooth and invisible transition from the center to the periphery through the continuous and gradual change of the microstructure parameters, greatly improving the comfort and compliance of wearing. The design method provides a systematic and precise approach to realizing this zoned optical lens, ensuring that the overall optical performance of the lens meets the clinical needs and wearer experience through multi-parameter optimization and iterative simulation. This solution breaks through the limitations of traditional uniform design and provides an innovative and efficient technical solution for the myopia prevention and control field.

[0054] The above is only the preferred embodiment of the application; all the protection scope of the application is included, any person skilled in the art can make equivalent replacement or change according to the technical solution and the improvement concept of the application within the technical range disclosed by the application, which should be covered in the protection scope of the application.

Claims

1. A zoned scattering ophthalmic lens for myopia control, characterized in that: The structure comprises the following: an optically transparent lens substrate (1); a central optical zone (2) disposed in the geometric center region of the lens substrate (1), with a diameter ranging from 4.0 mm to 8.0 mm, the optical scattering coefficient of the central optical zone (2) being less than 0.1, and the modulation transfer function value at 30 cycles / mm spatial frequency being higher than 0.6; a peripheral optical zone (3) in the form of a ring structure surrounding the central optical zone (2) and extending to the edge region of the lens substrate (1), the optical scattering coefficient of the peripheral optical zone (3) being higher than 0.5, and the modulation transfer function value at 30 cycles / mm spatial frequency being less than 0.2; a smooth transition zone (4) in the form of a ring structure disposed between the central optical zone (2) and the peripheral optical zone (3), the smooth transition zone (4) providing a continuous gradual change in the scattering coefficient from the central optical zone (2) to the peripheral optical zone (3).

2. A zoned scattering spectacle lens for myopia control according to claim 1, wherein: The lens substrate (1) is composed of an ophthalmic-grade optical material; the refractive index of the lens substrate (1) is 1.49 to 1.67, the Abbe number is not less than 30, and the light transmittance in the visible light spectrum range is not less than 98%; the lens substrate (1) has a front surface (6) and a back surface (7), and the central optical zone (2), the peripheral optical zone (3), and the smooth transition zone (4) can be disposed on the front surface (6) or the back surface (7) of the lens substrate (1), or on both the front surface (6) and the back surface (7) of the lens substrate (1).

3. The zoned scattering ophthalmic lens for myopia control of claim 1, wherein: The central optical zone (2) adopts an aspheric surface or a free-form surface design, the surface of the central optical zone (2) is a smooth optical surface, and the smooth optical surface adopts any one of the following two design methods:

1. does not contain any microstructure for actively scattering light, and 2. only contains nanoscale pseudo-random textures with a height or depth of less than 10 nm, wherein the average period of the pseudo-random textures is less than the wavelength of visible light.

4. The zoned scattering ophthalmic lens for myopia control of claim 1, wherein: The peripheral optical zone (3) contains a regularly arranged microlens array (5), the microlens array (5) is used to induce a preset amount of myopic defocus signal at the peripheral retina, the type of the microlens array (5) includes spherical microlenses, aspheric microlenses, or annular microlenses, the average diameter of the microlens array (5) ranges from 20 microns to 200 microns, the average height or depth ranges from 5 microns to 50 microns, and the center-to-center distance of the microlens array (5) ranges from 50 microns to 300 microns, the layout of the microlens array (5) is a hexagonal close-packed array or a square grid array, the refractive power of the microlens array (5) is designed to induce myopic defocus ranging from +1.5 diopters to +4.0 diopters at the peripheral retina, and the density of the microlens array (5) in the peripheral optical zone (3) is higher than 200 / mm2.

5. A zoned scattering spectacle lens for myopia control according to claim 4, wherein: The width of the smooth transition zone (4) ranges from 0.5mm to 2.0mm; the smooth transition zone (4) realizes the smooth transition of scattering coefficient by continuous and gradual change of microstructure parameters, including the height, diameter, curvature, density or combination thereof of the microlens array (5); In the smooth transition zone (4), the height of the microlens array (5) continuously increases from near-zero value near the central optical zone (2) to a set value near the peripheral optical zone (3), the density of the microlens array (5) continuously increases from sparse distribution or zero distribution near the central optical zone (2) to high-density distribution near the peripheral optical zone (3), the radius of curvature of the microlens array (5) continuously decreases from a larger value near the central optical zone (2) to a smaller value near the peripheral optical zone (3), the scattering coefficient of the smooth transition zone (4) continuously and monotonically increases from below 0.1 to above 0.5, the modulation transfer function value of the smooth transition zone (4) continuously and monotonically decreases from above 0.6 to below 0.2 at 30 cycles / mm spatial frequency, and the defocus amount of the smooth transition zone (4) continuously and monotonically increases from 0 diopter to a range of +1.5 diopter to +4.0 diopter.

6. A method for designing a zoned scattering ophthalmic lens for myopia control, for manufacturing a zoned scattering ophthalmic lens as claimed in claim 5, characterized in that: The method comprises the following steps: Step one: obtaining the basic eye parameters and refractive data of the wearer; Step two: defining the optical performance target of the central optical zone (2), setting the effective diameter of the central optical zone (2) to range from 4.0mm to 8.0mm, setting the modulation transfer function value of the central optical zone (2) at 30 cycles / mm spatial frequency to be not less than 0.6, and the optical scattering coefficient to be not higher than 0.1, and designing the central optical zone (2) as a smooth optical surface; Step three: defining the optical performance target of the peripheral optical zone (3), setting the peripheral optical zone (3) to surround the central optical zone (2), with the target value of the optical scattering coefficient being not less than 0.5, and the modulation transfer function value at 30 cycles / mm spatial frequency being not higher than 0.2, and setting the peripheral optical zone (3) to induce a myopic defocus of +1.5 diopter to +4.0 diopter on the peripheral retina by introducing a microlens array (5); Step four: designing the parameters of the microlens array (5) in the peripheral optical zone (3), with the average diameter of the microlens array (5) ranging from 20μm to 200μm, the average height or depth ranging from 5μm to 50μm, and the center-to-center distance ranging from 50μm to 300μm; Step five: designing the gradual change parameters of the microlens array (5) in the smooth transition zone (4), setting the width of the smooth transition zone (4) to range from 0.5mm to 2.0mm, and selecting a gradual change function to describe the spatial distribution of at least one of the height or density of the microlens array (5). Step six: build a three-dimensional optical model and simulate optical performance, input the optical power of the lens base (1) and the geometric and optical parameters of the central optical zone (2), peripheral optical zone (3) and smooth transition zone (4) into the optical design software, simulate the light propagation path by ray tracing, and calculate the modulation transfer function, point spread function, optical defocus amount and scattering coefficient of the lens at different spatial frequencies; Step seven: iterative optimization according to the simulation results obtained in step six, evaluate whether the preset central visual clarity, peripheral myopia control defocus amount and visual comfort requirements are met, if not, adjust the geometric parameters, microstructure parameters and gradient function of the central optical zone (2), peripheral optical zone (3) or smooth transition zone (4), and repeat step six until all performance targets are met; Step eight: generate manufacturing data, generate numerical control processing instructions, photolithography mask pattern or mold design file for lens manufacturing according to the finally determined optical design parameters.

7. The method of designing a zoned scattering ophthalmic lens for myopia control according to claim 6, wherein: The basic eye parameters in step one include eye axial length, corneal curvature, anterior chamber depth, lens thickness and pupil diameter, and the refractive data includes the wearer's spherical power, cylindrical power and axis.

8. The method of designing a zoned scattering ophthalmic lens for myopia control of claim 6, wherein: The basic eye parameters in step one also include wavefront aberration data of the eyeball, which is obtained by Hartmann-Shack wavefront sensor and used to guide the design of freeform or aspheric surface of the lens base (1).

9. The method of designing a zoned scattering ophthalmic lens for myopia control of claim 6, wherein: The layout mode of the microlens array (5) in step four is a hexagonal close-packed array, and the material of the microlens array (5) is consistent with that of the lens base (1).

10. The method of designing a zoned scattering ophthalmic lens for myopia control of claim 6, wherein: The gradient function in step five is a cubic polynomial function or a Sigmoid function, the height of the microlens array (5) continuously increases from zero or near zero near the boundary of the central optical zone (2) to a set value near the boundary of the peripheral optical zone (3), and the density of the microlens array (5) continuously increases from zero or near zero near the boundary of the central optical zone (2) to a set value near the boundary of the peripheral optical zone (3).

11. The method of designing a zoned scattering ophthalmic lens for myopia control of claim 6, wherein: The measurement or simulation method of the optical scattering coefficient includes: using an optical scattering measurement system to measure the backscattering intensity of the lens at a wavelength of 550 nanometers, and converting it into a scattering coefficient.

12. The method of designing a zoned scattering ophthalmic lens for myopia control of claim 6, wherein: The measurement or simulation method of the modulation transfer function includes: using an optical quality evaluation method to measure or simulate the modulation transfer function value at a spatial frequency of 30 cycles / mm in the central optical zone (2), peripheral optical zone (3) and smooth transition zone (4), respectively, and the calculation of the modulation transfer function value is based on the Fourier transform of the point spread function or line spread function.

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