Optical lens combined with heterogeneous scattering unit array and design method thereof

Abstract

The invention discloses an optical lens combined with a heterogeneous scattering unit array and a design method of the optical lens, which are applied to the field of optical elements, and aims to solve the technical problem that the existing optical lens is difficult to consider both central vision definition and peripheral defocus intervention efficiency. A personalized optical model is constructed according to the eye axis length, pupil dynamics and eye using behaviors of a user, a center area, a transition area and a peripheral area are divided, a sparse scattering unit, a gradient transition unit and a high-density strong scattering unit are configured respectively, the form, the size and the arrangement of the units are reversely deduced through a multi-target optimization algorithm, and a multi-target optimization model is constructed. Cooperative optimization of central high-contrast imaging and peripheral myopia signal enhancement is realized, intervention efficiency and wearing comfort are remarkably improved, a pupil adaptive adjustment layer is introduced, a scattering path is dynamically modulated to adapt to different illumination and visual tasks, and the performance of the lens can be dynamically adjusted according to the physiological state and eye use scene of a user.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical elements, in particular to an optical lens combined with an array of heterogeneous scattering units and a design method thereof. BACKGROUND

[0002] With the continuous rise of myopia prevalence worldwide, especially the rapid spread of high myopia in children and adolescents, myopia control technology based on optical intervention has become a research hotspot in the field of eye optics. The current mainstream myopia control lenses mainly rely on the theory of peripheral defocus and contrast regulation mechanism, by introducing micro-structured optical elements on the surface or inside of the lens, changing the imaging characteristics of incident light on the retina, and thus transmitting biological signals to the eyeball to inhibit the growth of the eye axis. The core functional unit of this type of lens is usually a microlens array or a diffractive optical structure, and the design goal is to construct an effective defocus or low-contrast signal field in the peripheral retina area without significantly sacrificing central vision.

[0003] Among them, the contrast control type lens reduces the spatial frequency response of the retinal image through optical scattering, which has been clinically proven to effectively delay myopia progression.

[0004] However, existing products generally use a homogeneous scattering unit array, that is, all micro-structured units in the lens have completely consistent geometric shapes, size parameters, and optical functions. This design, although convenient for standardized manufacturing, is fundamentally contradictory in terms of optical performance: in order to ensure the high-resolution visual needs of the foveal region, the scattering intensity must be suppressed below the physiological tolerance threshold, resulting in insufficient control signal intensity received by the peripheral retina; if the global scattering intensity is forcibly increased to enhance the control effect, the central visual acuity will suffer unacceptable losses, causing visual disturbances such as glare and ghosting, significantly reducing the wearing comfort and user compliance.

[0005] The existing technology is further limited by its static and uniform optical modulation capability, which cannot adapt to the spatial heterogeneity of the physiological response characteristics of the human retina. The foveal region is highly sensitive to high spatial frequency information, while the peripheral retina is more responsive to low-frequency defocus signals, and the uniform scattering mode cannot achieve regionalized precise stimulation. At the same time, there are significant individual differences in the pupil dynamic range, accommodation reserve, eye axis length, and visual behavior patterns of different users, and the existing lenses lack dynamic adaptation capability, making it difficult to individualize the optical performance for specific users or specific visual scenes (such as gazing into the distance, reading, night driving). Therefore, there is an urgent need for a new type of myopia control lens architecture that can break through the shackles of homogeneity and achieve spatial programmable scattering characteristics, simultaneously achieving the dual goals of visual quality assurance and maximum myopia control efficiency on a single optical carrier. SUMMARY

[0006] The core of the present application is to realize the regional precise regulation of retinal imaging contrast by configuring microstructure units with differentiated optical scattering characteristics in different areas of the lens, to solve the problem of lack of dynamic adaptation ability of the lens in the prior art, and to introduce a pupil self-adaptive adjustment layer and an individualized design method, so that the performance of the lens can be dynamically adjusted according to the physiological state and eye use scene of the user, and the intervention efficiency and user compliance are significantly improved.

[0007] To solve the above problems, the present application adopts the following technical solutions.

[0008] A design method of an optical lens combined with a heterogeneous scattering unit array, comprising the following steps: S1, obtaining a physiological parameter data set of a target user, the physiological parameter data set comprising an axial length, a corneal curvature radius, a pupil diameter dynamic range, an accommodation amplitude and a retinal sensitivity distribution map; S2, establishing a user-specific optical demand model based on the physiological parameter data set, determining the radial boundary positions of the central vision area, the transition functional area and the peripheral control area of the lens, and the target scattering intensity threshold values of each area; S3, according to the target scattering intensity threshold value, reversely deducing the scattering unit parameters required by each area, the scattering unit parameters including geometric shape, size parameter, distribution density and arrangement sequence; S4, using a ray tracing simulation algorithm to evaluate the imaging quality of the preliminary designed heterogeneous scattering unit array under the whole eye model, calculating the modulation transfer function value of the central vision area and the contrast attenuation factor of the peripheral control area; S5, when the simulation result does not meet the preset performance index, then iteratively optimize the scattering unit parameters until convergence; S6, inputting the finally determined scattering unit parameter set into a numerical control micro-nano processing equipment, and preparing a heterogeneous scattering unit array on the surface of a substrate optical lens through gray-scale lithography or laser direct writing process.

[0009] Further, the operation of establishing a user-specific optical demand model in step S2 specifically comprises the following steps: S2.1, introducing a visual task weight factor, the visual task weight factor being generated according to a user daily eye use behavior questionnaire, the questionnaire covering daily near work time, outdoor activity frequency, screen use habit and night driving demand; S2.2, adjusting the upper limit value of the scattering intensity threshold value of the peripheral control area according to the visual task weight factor, for users with daily near work time greater than four hours, increasing the upper limit of the scattering intensity threshold value of the peripheral control area by fifteen percent, and for users with weekly outdoor activity frequency less than three times, increasing the upper limit of the scattering intensity threshold value of the peripheral control area by ten percent.

[0010] Further, the operation of inversely deriving the scattering unit parameters of each region in step S3 specifically includes the following steps: using a multi-objective optimization algorithm to optimize the objective function, which contains three items: the first item is the numerical maximization of the modulation transfer function of the central vision zone at thirty cycles per degree of spatial frequency, the second item is the minimization of the contrast decay factor of the peripheral control zone at ten degrees of eccentricity, and the third item is the minimization of the absolute value of the gradient change rate of the scattering intensity of the transition function zone, the constraint conditions of the multi-objective optimization algorithm include that the minimum feature size of the scattering unit is not less than five microns, the maximum distribution density is not more than one hundred per square millimeter, and the center-to-center distance between adjacent scattering units is not less than eighty percent of the average size.

[0011] Further, the operation of using a ray tracing simulation algorithm to evaluate the imaging quality in step S4 specifically includes the following steps: constructing a full-eye optical model containing the cornea, aqueous humor, lens, vitreous, and retina, the full-eye optical model of the retina uses a non-uniform sampling grid, the sampling density in the foveal region is ten thousand points per square millimeter, and the sampling density in the peripheral region is one thousand points per square millimeter, the simulation light source uses the standard CIE D65 daylight spectrum, the incident angle covers the range of negative thirty degrees to positive thirty degrees, the simulation output includes the point spread function matrix, the line spread function curve, and the modulation transfer function surface graph, and the optical scattering intensity under each field of view angle is quantified by calculating the second-order central moment of the point spread function.

[0012] Further, the operation of processing by the numerical control micro-nano machining equipment in step S6 includes the following: using a dual-beam interference lithography system with a laser wavelength of three hundred sixty-five nanometers, the exposure dose is gray-scale modulated according to the target height of the scattering unit, for scattering units with a height less than one micron, the exposure dose is set to twenty millijoules per square centimeter, for scattering units with a height between one micron and five microns, the exposure dose is set to fifty millijoules per square centimeter, for scattering units with a height greater than five microns, a multi-layer overlay process is used, and the exposure dose of each layer is increased by twenty percent, after processing, the three-dimensional topography of the scattering unit is scanned by atomic force microscopy, and the areas with a topography error exceeding five percent are locally laser trimmed.

[0013] Further, the local laser trimming operation uses a femtosecond laser system with a pulse width of one hundred femtoseconds, a repetition frequency of one thousand hertz, and a single pulse energy of zero point one microjoules, and the trimming precision reaches the nanometer level.

[0014] An optical lens combined with a heterogeneous scattering unit array, designed and manufactured by the above-mentioned design method, comprising a base optical lens and a heterogeneous scattering unit array, the heterogeneous scattering unit array is covered on the surface of the base optical lens or embedded in the interior thereof, the base optical lens is divided into three concentric annular regions of central vision area, transition function area and peripheral control area, the heterogeneous scattering unit array is composed of a plurality of scattering units, the spatial distribution density, geometric shape, size parameter and optical scattering intensity of the scattering units on the base optical lens are designed differently according to the functional requirements of the region where they are located. Further, an optical lens combined with a heterogeneous scattering unit array further comprises a pupil self-adaptive adjustment layer, which is arranged between the base optical lens and the heterogeneous scattering unit array, and is composed of electrochromic material or liquid crystal polymer; the pupil self-adaptive adjustment layer is in an optically transparent state in an unpowered state, and can locally change the refractive index distribution in a powered state, so as to dynamically modulate the effective optical path length of the scattering units below.

[0015] Further, the pupil self-adaptive adjustment layer is divided into a plurality of independently controlled sub-regions, each sub-region corresponding to a functional sub-zone of the base optical lens; the measured value of the user's pupil diameter or the preset visual task mode is input through an external controller to drive the voltage signal of the corresponding sub-region, so as to realize real-time dynamic compensation of the scattering intensity.

[0016] Further, in the central vision area, the distribution density of the scattering units is less than five per square millimeter, the maximum transverse size of a single scattering unit is less than twenty microns, and the full width at half maximum of the optical scattering angle is less than three degrees; in the peripheral control area, the distribution density of the scattering units is higher than fifty per square millimeter, the maximum transverse size of a single scattering unit is between fifty microns and two hundred microns, and the full width at half maximum of the optical scattering angle is between ten degrees and twenty-five degrees; in the transition function area, the distribution density, size and scattering angle parameters of the scattering units continuously change along the radial direction from the central vision area to the peripheral control area.

[0017] Further, the refractive power distribution of the base optical lens is optimized in aspheric surface according to the axial length, corneal curvature and accommodation lag of the individual user's eye, in the central vision area, the refractive power error of the base optical lens is controlled within plus or minus zero point twelve diopters, in the peripheral control area, the base optical lens introduces additional positive defocus amount, the value of which is between zero point five diopters and one point five diopters.

[0018] Further, the arrangement mode of the heterogeneous scattering unit array adopts a non-periodic spatial coding strategy, and the arrangement sequence is optimized and designed according to the dynamic contraction and expansion characteristics of the human eye pupil under different illumination conditions. In the area close to the nasal side and the temporal side of the human face of the base optical lens, the distribution density and size parameters of the scattering units are asymmetrically configured according to the binocular parallax and fusion visual demand. The distribution density of the scattering units in the upper half area of the base optical lens is reduced by 20% to 30% compared with the distribution density of the scattering units in the lower half area of the base optical lens.

[0019] Compared with the prior art, the present application has the following advantages: The present application realizes independent optimization and synergistic enhancement of central visual clarity and peripheral myopia control efficiency on a single lens for the first time by constructing a spatially heterogeneous scattering unit array. The central visual area adopts sparse distributed micro-scale scattering units to ensure that high spatial frequency information transmission is not disturbed and maintain excellent visual acuity. The peripheral control area adopts high-density, large-size, and strong scattering angle shaped structure units to effectively stimulate the myopia control biological signals of the peripheral area of the retina. The gradient design of the transition function area eliminates the optical performance mutation and improves the wearing comfort. The pupil adaptive adjustment layer and individualized design method are introduced to dynamically adjust the lens performance according to the user's physiological state and eye use scene, significantly improving the intervention efficiency and user compliance. The whole process chain adopts micro-nano processing technology that can be mass produced to ensure product consistency and cost controllability. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the main architecture of the present application; Figure 2 It is a schematic diagram of the core principle framework of the spatial non-uniform distribution and regional optical scattering regulation of the heterogeneous scattering unit array in the present application; Figure 3 It is a logic flow framework diagram of the central visual area, transition function area, peripheral control area and gradient configuration of their scattering parameters in the present application; Figure 4 It is a multi-level interaction and data flow diagram of the directional modulation relationship between the geometric shape and optical scattering characteristics of the scattering unit in the present application Figure 1 ; Figure 5 It is a multi-level interaction and data flow diagram of the directional modulation relationship between the geometric shape and optical scattering characteristics of the scattering unit in the present application Figure 2 ; Figure 6 It is a logic flow framework diagram of the pupil adaptive adjustment layer and the synergistic dynamic compensation mechanism of the heterogeneous scattering unit array in the present application; Figure 7 It is a whole process framework diagram of the lens individualized design method based on individual physiological parameters and visual task weight factors in the present application. Detailed Implementation

[0021] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0022] First implementation method: Please see Figure 1 and Figure 2 An optical lens incorporating a heterospatial scattering unit array includes a base optical lens and a heterospatial scattering unit array. The heterospatial scattering unit array covers the surface of the base optical lens or is embedded within it. The base optical lens is a basic optical element with refractive correction function, and its material is selected as high-transmittance, low-dispersion polycarbonate or polymethyl methacrylate, with a refractive index range of 1.50 to 1.60. The base optical lens is divided into three concentric ring regions: a central visual zone, a transitional functional zone, and a peripheral control zone. The radial boundary position of each region is determined based on the dynamic range of the pupil diameter and the retinal sensitivity distribution map of the target user. The heterospatial scattering unit array is composed of multiple scattering units. The spatial distribution density, geometry, size parameters, and optical scattering intensity of the scattering units on the base optical lens are designed differently according to the functional requirements of their respective regions.

[0023] Please see Figure 3 and Figure 4 The central visual area corresponds to the area of ​​the human eye with the most acute vision in the fovea, with a radial radius ranging from 0 mm to 5 mm. To ensure that the imaging contrast loss in this area is less than 5%, the distribution density of scattering units in this area is strictly controlled to less than five per square millimeter. The maximum lateral dimension of a single scattering unit is less than 20 micrometers, and its optical scattering angle half-width is less than 3 degrees. To ensure that the imaging contrast loss in this area is less than 5%, the scattering units in this area preferably adopt circular protrusions or elliptical depressions with a surface curvature radius greater than 50 micrometers to minimize the introduction of higher-order aberrations. The height of the circular protrusions ranges from 0.5 micrometers to 1.5 micrometers, and the depth of the elliptical depressions ranges from 0.3 micrometers to 1.0 micrometers. The scattering units in this area are arranged using a sparse random distribution strategy, with the center-to-center distance between adjacent units not less than 100 micrometers to avoid periodic diffraction effects interfering with visual quality.

[0024] Please see Figure 3 and Figure 5, the peripheral control zone corresponds to the peripheral retina region of the human eye, the radial radius range is fifteen to thirty millimeters, the distribution density of the scattering units in this region is higher than fifty per square millimeter, the maximum transverse size of a single scattering unit is between fifty microns and two hundred microns, and the optical scattering angle half width is between ten degrees and twenty-five degrees, so as to generate significant low spatial frequency scattering signals in this region, the scattering units in this region preferentially adopt polygonal pyramid or asymmetric corrugated structure, the surface has multiple discrete inclined surfaces, the inclined surface angle is between five degrees and fifteen degrees, so as to enhance the multidirectional deflection ability of the incident light and expand the scattering angle distribution range, the base shape of the polygonal pyramid structure includes square, hexagon or octagon, and the height range is three to ten microns; the asymmetric corrugated structure has a peak spacing range of twenty to eighty microns and a peak height range of two to eight microns, and the arrangement of the scattering units in this region adopts a non-periodic spatial coding strategy, and the arrangement sequence is optimized and designed according to the dynamic contraction and expansion characteristics of the human eye pupil under different illumination conditions, so as to ensure that the scattering intensity distribution remains stable within the pupil diameter variation range.

[0025] The transition function zone is located between the central vision zone and the peripheral control zone, and the radial radius range is five to fifteen millimeters, the distribution density, size and scattering angle parameters of the scattering units in this region change continuously along the radial direction from the central vision zone to the peripheral control zone, so as to realize the smooth transition of the optical scattering intensity and avoid visual mutation, specifically, the scattering unit distribution density increases linearly from five per square millimeter to fifty per square millimeter, the maximum transverse size of a single scattering unit increases linearly from twenty microns to fifty microns, and the optical scattering angle half width increases linearly from three degrees to ten degrees, the scattering unit morphology in this region adopts a mixed structure of circular protrusions and polygonal pyramids, the proportion gradually changes from one hundred percent circular protrusions to one hundred percent polygonal pyramids along the radial direction, and the gradient change rate of the transition function zone is strictly controlled, and the absolute value of the scattering intensity gradient change rate is not more than zero point one per millimeter, so as to ensure that the visual transition is smooth and has no jumping feeling.

[0026] The arrangement mode of the heterogeneous scattering unit array is asymmetrically configured in the nasal side and temporal side regions of the lens to adapt to the binocular parallax and fusion visual requirements, in the nasal side region, the scattering unit distribution density is increased by fifteen percent compared with the temporal side region, and the scattering unit size is increased by ten percent, so as to compensate for the lower sensitivity of the nasal retina to scattering signals, in the upper region of the lens, the scattering unit distribution density is reduced by twenty to thirty percent compared with the lower region, so as to adapt to the difference in visual line distribution of the human eye when reading and gazing far away, the upper region corresponds to the main visual line region when reading, and reducing the scattering intensity can reduce visual interference; the lower region corresponds to the main visual line region when gazing far away, and increasing the scattering intensity can enhance the myopia control effect.

[0027] The optical lens combined with the array of inhomogeneous scattering units further comprises a pupil-adaptive adjustment layer, which is arranged between the base optical lens and the array of inhomogeneous scattering units and is composed of an electrochromic material or a liquid crystal polymer; the pupil-adaptive adjustment layer is in an optically transparent state in an unpowered state and can locally change the refractive index distribution thereof in a powered state, thereby dynamically modulating the effective optical path length of the scattering units thereunder; The pupil-adaptive adjustment layer is divided into a plurality of independently controlled sub-regions, each of which corresponds to a functional sub-zone of the base optical lens; a user's measured pupil diameter or a preset visual task mode is input by an external controller to drive a voltage signal of a corresponding sub-region, thereby achieving real-time dynamic compensation of the scattering intensity, in combination with Figure 6 As shown, when the user's pupil diameter is less than three millimeters, the pupil-adaptive adjustment layer applies a voltage of zero point five volts in the central vision area to reduce the effective height of the scattering units in this area and further reduce scattering interference; when the user's pupil diameter is greater than six millimeters, the pupil-adaptive adjustment layer applies a voltage of two point zero volts in the peripheral control area to increase the effective height of the scattering units in this area and enhance the scattering effect; the voltage adjustment range is zero to three volts, and the adjustment accuracy is zero point one volt.

[0028] The refractive power distribution of the base optical lens is designed by aspherical optimization according to the axial length, corneal curvature and accommodation lag of the user; in the central vision area, the refractive power error of the base optical lens is controlled within plus or minus zero point one two diopters to ensure optimal visual clarity; in the peripheral control area, the base optical lens introduces an additional positive defocus amount, the value of which is between zero point five diopters and one point five diopters, and forms a synergistic intervention effect with the contrast modulation signal generated based on the array of inhomogeneous scattering units; the aspherical coefficient is determined according to the user's corneal topography data to ensure that the curvature of the lens surface matches the curvature of the user's cornea and reduces aberration introduction.

[0029] In combination with Figure 7 The design method of the optical lens combined with the array of inhomogeneous scattering units, as shown, specifically comprises the following steps: S1, obtaining a physiological parameter data set of a target user, the physiological parameter data set including the axial length, the corneal curvature radius, the pupil diameter dynamic range, the accommodation amplitude and the retinal sensitivity distribution map; S2, establishing a user-specific optical demand model based on the physiological parameter data set to determine the radial boundary positions of the lens central vision area, the transition functional area and the peripheral control area and the target scattering intensity threshold values of the areas; S3, inversely deducing the scattering unit parameters required by each area according to the target scattering intensity threshold values, the scattering unit parameters including the geometric shape, the size parameter, the distribution density and the arrangement sequence; S4, using light tracing simulation algorithm, the imaging quality of the preliminary design of the heterogeneous scattering unit array is evaluated under the full eye model, and the modulation transfer function value of the central vision area and the contrast decay factor of the peripheral control area are calculated; S5, when the simulation result does not meet the preset performance index, then iteratively optimize the scattering unit parameters until convergence; S6, input the final determined scattering unit parameter set into the numerical control micro-nano processing equipment, and prepare the heterogeneous scattering unit array on the surface of the substrate optical lens through gray-scale lithography or laser direct writing process.

[0030] The operation of establishing a user-specific optical demand model in step S2 specifically includes the following steps: S2.1, introduce a visual task weight factor, which is generated according to a user daily eye use behavior questionnaire, which covers daily near work time, outdoor activity frequency, screen use habit and night driving demand; S2.2, adjust the upper limit value of the scattering intensity threshold of the peripheral control area according to the visual task weight factor, for users with daily near work time greater than four hours, increase the upper limit of the scattering intensity threshold of the peripheral control area by fifteen percent, for users with outdoor activity frequency less than three times a week, increase the upper limit of the scattering intensity threshold of the peripheral control area by ten percent; The calculation formula of the visual task weight factor is as follows: ; Wherein, W is the visual task weight factor, I near is the near work time index, which is one when the daily near work time is greater than four hours, otherwise it is zero; I outdoor is the outdoor activity frequency index, which is one when the weekly outdoor activity frequency is less than three times, otherwise it is zero.

[0031] The operation of inversely deducing the scattering unit parameters required by each area in step S3 specifically includes the following steps: using a multi-objective optimization algorithm to optimize the objective function, which includes three items: the first item is to maximize the value of the modulation transfer function of the central vision area at thirty cycles per degree of spatial frequency, the second item is to minimize the contrast decay factor of the peripheral control area at ten degrees of eccentric angle, and the third item is to minimize the absolute value of the scattering intensity gradient change rate of the transition function area. The constraint conditions of the multi-objective optimization algorithm include that the minimum feature size of the scattering unit is not less than five microns, the maximum distribution density is not more than one hundred per square millimeter, and the center distance between adjacent scattering units is not less than eighty percent of the average size; The expression of the optimization objective function is as follows: ; Wherein, F is the comprehensive optimization objective function, MTF 30The CAF is the value of the modulation transfer function of the central visual region at a spatial frequency of thirty cycles per degree. 10 G' is the contrast attenuation factor of the surrounding control area at a 10-degree eccentric angle, G' is the gradient change rate of scattering intensity in the transition functional area, and α, β, and γ are all weighting coefficients with values ​​of 0.6, 0.3, and 0.1, respectively.

[0032] Step S4, which uses a ray tracing simulation algorithm to evaluate image quality, specifically includes the following steps: Constructing a whole-eye optical model that includes the cornea, aqueous humor, lens, vitreous body, and retina. The whole-eye optical model of the retina uses a non-uniform sampling grid, with a sampling density of 10,000 points per square millimeter in the fovea region and 1,000 points per square millimeter in the peripheral region. The simulation light source uses the standard CIE D65 daylight spectrum, with the incident angle covering the range of -30 degrees to +30 degrees. The simulation output includes a point spread function matrix, a line spread function curve, and a modulation transfer function surface plot. The optical scattering intensity at each field of view is quantified by calculating the second central moment of the point spread function. The formula for calculating the second central moment of the point spread function is as follows: ; Where, σ 2 Let X be the second central moment of the point spread function. i These are the coordinates of the sampling point location. Let PSF be the centroid location of the point spread function. i,j Let be the value of the point spread function at position i,j.

[0033] The processing operations performed in step S6 using CNC micro-nano fabrication equipment include the following: A dual-beam interference lithography system with a laser wavelength of 365 nanometers is used. The exposure dose is modulated according to the target height of the scattering unit. For scattering units with a height of less than one micrometer, the exposure dose is set to 20 millijoules per square centimeter. For scattering units with a height between one and five micrometers, the exposure dose is set to 50 millijoules per square centimeter. For scattering units with a height greater than five micrometers, a multi-layer overlay process is used, with the exposure dose increasing by 20% for each layer. After processing, the three-dimensional morphology of the scattering unit is scanned across the entire area using an atomic force microscope. Areas with a morphology error exceeding 5% are subjected to local laser trimming. The local laser trimming operation uses a femtosecond laser system with a pulse width of 100 femtoseconds, a repetition frequency of 1 kilohertz, and a single pulse energy of 0.1 microjoules, achieving a trimming accuracy at the nanometer level.

[0034] The present application realizes independent optimization and synergistic enhancement of central vision clarity and peripheral myopia control performance on a single lens for the first time. The central vision area adopts sparse distributed micro-scale scattering units to ensure high spatial frequency information transmission without interference and maintain excellent visual acuity. The peripheral control area adopts high-density, large-size, and strong scattering angle shaped structure units to effectively stimulate the myopia control biological signals of the peripheral area of the retina. The gradient design of the transition function area eliminates the optical performance mutation and improves the wearing comfort. The pupil self-adaptive adjustment layer and individualized design method are introduced to dynamically adjust the lens performance according to the user's physiological state and eye use scene, significantly improving the intervention efficiency and user compliance. The whole process chain adopts the micro-nano processing technology that can be mass-produced to ensure product consistency and cost controllability. The technical solution of the present application breaks through the performance bottleneck of traditional homogeneous scattering lenses and provides a new technical path and product form for the myopia control field.

[0035] The above is only the preferred specific embodiment of the present application; any person skilled in the art within the technical scope disclosed by the present application, according to the technical solution and improvement concept of the present application, should be covered within the protection scope of the present application.

Claims

1. A method of designing an optical lens incorporating an array of inhomogeneous scattering cells, characterized in that: The method comprises the following steps: S1, obtaining a physiological parameter dataset of a target user, the physiological parameter dataset comprising an axial length, a corneal curvature radius, a dynamic range of a pupil diameter, an accommodation amplitude, and a retinal sensitivity distribution atlas; S2, establishing a user-specific optical demand model based on the physiological parameter dataset, and determining radial boundary positions of a central vision zone, a transition function zone, and a peripheral control zone, and target scattering intensity threshold values of the zones; S3, inversely deducing scattering unit parameters required by the zones according to the target scattering intensity threshold values, the scattering unit parameters comprising geometric shapes, size parameters, distribution densities, and arrangement sequences; S4, performing imaging quality evaluation of a preliminarily designed heterogeneous scattering unit array under a full-eye model by using a ray tracing simulation algorithm, and calculating a modulation transfer function value of the central vision zone and a contrast decay factor of the peripheral control zone; S5, when the simulation result does not meet a preset performance index, iteratively optimizing the scattering unit parameters until convergence is achieved; S6, inputting a final set of the scattering unit parameters into a numerical control micro-nano processing device, and preparing a heterogeneous scattering unit array on a surface of a base optical lens by using a gray-scale lithography or laser direct writing process.

2. The method of designing an optical lens incorporating an array of hetero-scattering cells according to claim 1, wherein: The operation of establishing the user-specific optical demand model in the step S2 specifically comprises the following steps: S2.1, introducing a visual task weight factor, the visual task weight factor being generated according to a user daily eye use behavior questionnaire, the questionnaire covering a daily near work duration, an outdoor activity frequency, a screen use habit, and a night driving demand; S2.2, adjusting an upper limit value of the scattering intensity threshold value of the peripheral control zone according to the visual task weight factor, for a user whose daily near work duration is greater than four hours, increasing the upper limit of the scattering intensity threshold value of the peripheral control zone by fifteen percent, and for a user whose outdoor activity frequency is less than three times a week, increasing the upper limit of the scattering intensity threshold value of the peripheral control zone by ten percent.

3. The method of designing an optical lens incorporating an array of hetero-scattering cells according to claim 2, wherein: The operation of inversely deducing the scattering unit parameters required by the zones in the step S3 specifically comprises the following steps: optimizing an objective function by using a multi-objective optimization algorithm, the objective function including three items: the first item is to maximize a value of a modulation transfer function of the central vision zone at a spatial frequency of thirty cycles per degree, the second item is to minimize a contrast decay factor of the peripheral control zone at a ten-degree eccentric angle, and the third item is to minimize an absolute value of a scattering intensity gradient change rate of the transition function zone, and constraint conditions of the multi-objective optimization algorithm include that a minimum feature size of the scattering unit is not less than five microns, a maximum distribution density is not more than one hundred per square millimeter, and a center-to-center distance between adjacent scattering units is not less than eighty percent of an average size of the scattering units.

4. The method of designing an optical lens incorporating an array of hetero-scattering cells according to claim 3, wherein: The step S4 includes the following steps: constructing a full-eye optical model including cornea, aqueous humor, lens, vitreous and retina, the full-eye optical model adopts a non-uniform sampling grid, the sampling density of the foveal region is 10,000 points per square millimeter, the sampling density of the peripheral region is 1,000 points per square millimeter, the simulation light source adopts a standard CIE D65 daylight spectrum, the incident angle covers a range of -30 degrees to +30 degrees, the simulation output includes a point spread function matrix, a line spread function curve and a modulation transfer function surface graph, and the optical scattering intensity under each field of view angle is quantified by calculating the second central moment of the point spread function.

5. The method of designing an optical lens incorporating an array of hetero-scattering cells according to claim 4, wherein: The step S6 includes the following steps: adopting a double-beam interference lithography system, the laser wavelength is 365 nm, the exposure dose is gray-scale modulated according to the target height of the scattering unit, for a scattering unit with a height less than 1 micron, the exposure dose is set to 20 mJ / cm2, for a scattering unit with a height between 1 micron and 5 microns, the exposure dose is set to 50 mJ / cm2, for a scattering unit with a height greater than 5 microns, a multi-layer overlay process is adopted, the exposure dose of each layer is increased by 20%, after the processing is completed, the three-dimensional morphology of the scattering unit is scanned by an atomic force microscope, and the local laser trimming is performed on the region with a morphology error exceeding 5%.

6. The method of designing an optical lens incorporating an array of hetero-scattering cells according to claim 5, wherein: The local laser trimming operation adopts a femtosecond laser system, the pulse width is 100 femtoseconds, the repetition frequency is 1 kHz, the single pulse energy is 0.1 μJ, and the trimming precision reaches the nanometer level.

7. An optical lens incorporating an array of inhomogeneous scattering elements, designed and manufactured using the design method of claim 1, characterized in that: The base optical lens and the heterogeneous scattering unit array are covered on the surface of the base optical lens or embedded in the interior thereof, the base optical lens is divided into three concentric annular regions of central vision area, transition function area and peripheral control area, the heterogeneous scattering unit array is composed of a plurality of scattering units, and the spatial distribution density, geometric shape, size parameter and optical scattering intensity of the scattering units on the base optical lens are designed differently according to the functional requirements of the region.

8. An optical lens incorporating an array of hetero-scattering cells according to claim 7, wherein: The pupil adaptive adjustment layer is arranged between the base optical lens and the heterogeneous scattering unit array, and is composed of electrochromic material or liquid crystal polymer; the pupil adaptive adjustment layer is in an optically transparent state in an unpowered state, and can locally change the refractive index distribution in a powered state, so as to dynamically modulate the effective optical path length of the scattering unit below.

9. An optical lens incorporating an array of hetero-scattering cells according to claim 8, wherein: The pupil adaptive adjustment layer is divided into a plurality of independently controlled sub-regions, each sub-region corresponds to a functional sub-area of the base optical lens; the measured value of the user's pupil diameter or the preset visual task mode is input through an external controller, a voltage signal of the corresponding sub-region is driven, and real-time dynamic compensation of the scattering intensity is realized.

10. An optical lens incorporating an array of hetero-scattering cells according to claim 9, wherein: In the central vision zone, the distribution density of the scattering units is less than five per square millimeter, the maximum lateral dimension of a single scattering unit is less than twenty microns, and the full width at half maximum of the optical scattering angle is less than three degrees; in the peripheral control zone, the distribution density of the scattering units is greater than fifty per square millimeter, the maximum lateral dimension of a single scattering unit is between fifty microns and two hundred microns, and the full width at half maximum of the optical scattering angle is between ten degrees and twenty-five degrees; in the transition functional zone, the distribution density, size, and scattering angle parameters of the scattering units change continuously along the radial direction from the central vision zone to the peripheral control zone.

11. An optical lens incorporating an array of hetero-scattering cells according to claim 10, wherein: The refractive power distribution of the base optical lens is designed by aspherical optimization according to the axial length, corneal curvature, and accommodation lag of the individual eye of the user; in the central vision zone, the refractive error of the base optical lens is controlled within plus or minus zero point one two diopters; in the peripheral control zone, the base optical lens introduces an additional positive defocus amount, which is between zero point five diopters and one point five diopters.

12. An optical lens incorporating an array of hetero-scattering cells according to claim 11, wherein: The arrangement of the heterogeneous scattering unit array adopts a non-periodic spatial coding strategy, and the arrangement sequence is optimized according to the dynamic contraction and expansion characteristics of the human pupil under different lighting conditions; in the regions of the base optical lens near the nasal side and the temporal side of the human face, the distribution density and size parameters of the scattering units are asymmetrically configured according to the binocular parallax and fusion visual requirements; the distribution density of the scattering units in the upper half region of the base optical lens is reduced by twenty percent to thirty percent compared to the distribution density in the lower half region of the base optical lens.

Images