Manufacturing method of customized myopia prevention and control lens

Abstract

The invention relates to the technical field of optical lens manufacturing, and particularly discloses a manufacturing method of customized myopia prevention and control lenses. The lens comprises a composite optical material composed of a high-molecular polymer matrix material, a photochromic compound and a core-shell structure quantum dot material, and a multi-layer composite coating system comprising an anti-reflection coating, an antistatic coating and a self-cleaning coating. The preparation method comprises the following steps: firstly, collecting eye parameters of a user, carrying out personalized optical design, and then carrying out material mixing pretreatment, micro-injection molding, surface finish machining, optical performance testing, material stabilization treatment and the like to complete lens manufacturing. According to the lens product, accurate matching with the eye features of the user can be achieved, and the vision correction effect is effectively improved; besides, according to the preparation method disclosed by the invention, the uniformity and the stability of the lens structure are ensured through processes such as multi-stage pressure control forming and photo-thermal synergistic stabilizing treatment, and the preparation method has the advantages of high process controllability and good product consistency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical lens manufacturing, more particularly, to a manufacturing method of customized myopia prevention lens. BACKGROUND

[0002] Most of the myopia prevention lenses on the market are designed with standardization, that is, they are mass-produced based on a limited number of fixed parameter combinations. Although this standardization production method can meet the basic vision correction needs, it cannot fully adapt to the physiological differences between different users. Specifically, traditional lens design often only considers the basic diopter parameter, while ignoring key individual difference factors such as the user's eyeball radius of curvature, eye axis length, and pupil diameter. This design method leads to the fact that the optical center of the lens cannot fully match the actual visual axis of the user, thereby affecting the visual quality and comfort of use.

[0003] Due to the lack of sufficient consideration of the individual eye characteristics of users in the prior art, the lenses produced by standardization have obvious deficiencies in adaptability. This deficiency not only affects the accuracy of vision correction, but also may cause discomfort symptoms such as visual fatigue and dizziness in the wearer. In particular, in the field of myopia prevention for teenagers, since the eyeballs of users in this age group are still in the development stage, individual differences are more significant, and standardization lenses are difficult to meet their special visual needs. SUMMARY

[0004] In order to solve the problem of insufficient adaptability of lenses to the eye structure of users caused by standardization production in the prior art, the present application provides a manufacturing method of customized myopia prevention lens.

[0005] A manufacturing method of customized myopia prevention lens, comprising the following steps: S1, user eye parameter acquisition: obtaining the eyeball radius of curvature, eye axis length and pupil diameter data of the user through optical measurement, and recording the vision correction requirement; S2, personalized optical design: based on the data collected in S1, generating the optical surface of the lens through computer-aided design, and setting the thickness parameter and the radius of curvature of the lens; S3, material selection and pretreatment: selecting a high molecular polymer matrix material, adding a photochromic compound and a quantum dot material to the matrix material to form a composite optical material, and after standing treatment in an environment with a temperature of 20-30°C and a humidity of 40-60% for 1-3h, a circular blank with a diameter of 50-80mm is prepared; S4, lens forming: the blank in S3 is formed into a preliminary lens structure through micro-injection molding process under the conditions of a pressure of 5-15MPa and a temperature of 150-200°C, and the cooling rate is controlled within the range of 0.5-2.0°C / s; S5, surface finishing: the lens formed in S4 is edge polished and polished to control the surface roughness to be between 0.01-0.1 μm, and a multi-layer composite coating is applied; S6, optical performance testing: the lens is placed in an optical testing environment, and transmittance measurement and dynamic vision simulation testing are performed under the condition of light intensity of 100-500 lx; S7, material stabilization treatment: the lens is heat treated at a temperature of 50-80 °C for a time of 10-30 min; S8, packaging and labeling: the lens that passes the test is packaged and labeled with user personalized parameters and manufacturing date.

[0006] By adopting the above technical scheme, the eye parameters such as the eyeball curvature radius and the eye axis length of the user are obtained through optical measurement, which plays a role in accurately capturing individual eye features, and further provides basic data for subsequent customized design; the computer-aided design generates an adaptive optical surface and sets the thickness parameters, which plays a role in matching the optical structure of the lens with the eye features of the user, and further realizes personalized adaptation; the high molecular polymer matrix is selected and the photochromic compound and quantum dots are added to form a composite material, which is placed in a specific temperature and humidity to form a blank, which plays a role in combining functional materials and stabilizing the initial state, and further provides a material basis for the optical function of the lens; the pressure, temperature and cooling rate are controlled through micro-injection molding, which plays a role in accurately shaping the lens structure and reducing internal stress, and further ensures the stability of the lens form; the surface roughness is controlled through edge polishing and polishing, and a multi-layer composite coating is applied, which plays a role in optimizing the surface state and imparting anti-reflection and other functions, and further improves the use adaptability; the optical performance testing under specific light conditions plays a role in verifying whether the optical performance of the lens meets the scene requirements, and further ensures that the performance meets the standards; the heat treatment at a specific temperature and time plays a role in stabilizing the internal structure of the material, and further reduces the performance fluctuation in long-term use; the packaging and labeling of personalized parameters and manufacturing date play a role in facilitating identification and traceability, and further ensure the product traceability.

[0007] Preferably, in step S1, the eyeball curvature radius ranges from 7.0 to 8.5 mm, the eye axis length ranges from 22.0 to 26.0 mm, and the pupil diameter ranges from 2.0 to 8.0 mm.

[0008] By adopting the technical scheme, the parameter range is set based on a large amount of clinical data statistics, and can cover the main eye feature distribution of myopia patients of teenagers and adults. The range setting considers the physiological feature difference of users in different age groups and the actual feasibility of the lens manufacturing process. By accurately limiting the range of the key eye parameters, a reliable data basis is provided for subsequent personalized optical design, so as to ensure that the designed lens optical surface can be best matched with the actual eye parameters of the user. Meanwhile, the setting of the parameter range also provides a clear basis for the selection of process parameters in the lens processing process, which helps to ensure that the final lens product meets the expected requirements in terms of accuracy of refractive correction and wearing comfort. In addition, the setting of the parameter range also fully considers the dynamic change characteristics of the pupil size under different light conditions, and provides data support for the visual performance of the lens in different use scenarios.

[0009] Preferably, in step S2, the optical surface design of the lens includes setting the lens center thickness to be between 0.5-2.0mm and the edge thickness to be between 1.0-3.0mm.

[0010] By adopting the technical scheme, the thickness configuration fully considers the structural strength and lightweight requirements of the lens. The setting of the center thickness is based on the mechanical properties of the material and the optical design requirements, which not only ensures that the lens has sufficient mechanical strength to resist impact in daily use, but also avoids affecting the appearance of the lens due to excessive thickening. The setting of the edge thickness is coordinated with the refractive power and the shape design of the lens, which ensures the integrity of the edge structure of the lens while optimizing the thickness distribution to improve the wearing comfort. The determination of the thickness range also refers to the actual ability of the lens processing process, so as to ensure stable thickness control in the injection molding process. In addition, this thickness configuration scheme is matched with the refractive index characteristics of the lens material, which can effectively optimize the optical performance of the lens.

[0011] Preferably, in step S3, the high polymer matrix material is a blend of polycarbonate and cyclic olefin copolymer with a refractive index of 1.50 to 1.67.

[0012] By adopting the technical scheme, the polycarbonate component provides good impact resistance and mechanical strength, ensuring the durability of the lens during use; and the cyclic olefin copolymer contributes excellent optical transparency and lower birefringence characteristics, which is beneficial to maintaining the imaging quality of the lens. The blending ratio of the two materials is optimized to accurately control the refractive index within the required range, which not only meets the requirements of different refractive power lenses for optical performance, but also provides a stable carrier basis for the addition of subsequent functional materials. The material system also has good processing adaptability, which can form a stable composite system with functional materials such as photochromic compounds and quantum dots, ensuring that each component is uniformly distributed in the material matrix and maintains stable performance for a long time.

[0013] Preferably, in step S3, the quantum dot material is a core-shell quantum dot with cadmium selenide as the core and zinc sulfide as the shell, and the size is 2-10 nm, and the additive amount is 0.05-0.5% of the total mass of the material.

[0014] By adopting the technical scheme, the size effect of the quantum dot and the advantage of the core-shell structure are fully utilized. The cadmium selenide core can provide excellent optical performance, and the zinc sulfide shell layer effectively improves the stability and dispersibility of the quantum dot. The size range is selected based on the matching degree of the quantum dot light emitting characteristics and the optical requirements of the lens, to ensure that the quantum dot has appropriate light emitting efficiency in the visible light range. The accurate control of the additive amount ensures that the quantum dot functions effectively, and avoids the decrease in material transparency or the aggregation phenomenon caused by excessive addition. The core-shell structure design can also effectively suppress the fluorescence quenching phenomenon of the quantum dot during use, and improve the reliability of long-term use. The interface bonding between the quantum dot and the matrix material is optimized through the shell layer, which helps to maintain the stability of the overall structure of the lens.

[0015] Preferably, in step S3, the mixing is achieved by first dispersing the photochromic compound and the quantum dot material in an organic solvent, treating by ultrasonic oscillation to form a functional mother liquor, then pre-mixing with the matrix material by dry method, and finally completing the melt blending and granulation by a twin-screw extruder.

[0016] By adopting the technical scheme, first, the ultrasonic oscillation is used to realize the molecular level dispersion of the photochromic compound and the quantum dot material in the liquid phase environment, effectively preventing the aggregation of the nanoscale quantum dot material. Then, the dry pre-mixing is used to realize the preliminary combination of the functional mother liquor and the matrix material powder, laying a foundation for the subsequent melt blending. Finally, through the melt blending process of the twin-screw extruder, the components are uniformly dispersed at the molecular level under the action of specific temperature and shear force, and the granulation process is completed. This segmented mixing method ensures the uniformity of the distribution of functional materials in the matrix, and avoids the problem of local enrichment or performance loss of materials caused by one-time mixing. The parameter control in the whole process ensures the performance consistency and processing stability of the final composite material.

[0017] Preferably, the power of the ultrasonic oscillation treatment is 100-500 W, and the treatment time is 5-15 minutes; the processing temperature of the melt blending is 160-190°C, and the screw rotation speed is 50-150 rpm.

[0018] By adopting the technical scheme, the functional material can be fully dispersed without damaging the material structure. The appropriate power range can ensure sufficient energy to make the quantum dot cluster depolymerize, and can also avoid material denaturation caused by too high power. The setting of the processing time ensures the sufficiency of the dispersion process, so that the photochromic compound and the quantum dot material form a stable suspension system in the organic solvent. At the same time, the processing temperature of the melt blending is set in the range of 160-190°C, which can ensure that the matrix material is fully melted and flowed, and can prevent the functional material from being decomposed and disabled due to too high temperature. In combination with the screw speed of 50-150 rpm, appropriate shear force can be generated to promote the uniform mixing of the components at the molecular level in the molten state. The combination of such process parameters ensures the uniformity and stability of the distribution of the functional material in the matrix, and provides a reliable raw material basis for subsequent processing steps.

[0019] Preferably, in step S4, the micro-injection molding process adopts multi-stage pressure control, wherein the first stage pressure is 5-10 MPa, the second stage pressure is 10-15 MPa, and the pressure switching time is between 0.5-2.0 seconds.

[0020] By adopting the technical scheme, by adopting the multi-stage pressure control strategy, the first stage injection pressure is set to 5-10 MPa in the micro-injection molding process, which can ensure that the molten material fills the mold cavity smoothly, and avoid excessive orientation of molecular chains or accumulation of internal stress caused by too high pressure. Then the pressure is raised to 10-15 MPa in the second stage, and this pressure range is set to ensure that the material continuously compensates for shrinkage during the pressure holding stage, and ensure the compactness of the lens forming. The pressure switching time is controlled in the range of 0.5-2.0 seconds, which is based on the material rheological properties and mold structure characteristics, which can not only realize the smooth transition of pressure, but also effectively avoid the phenomena of weld lines or flow imbalance caused by too fast switching. This segmented pressure control method accurately regulates the pressure change trajectory during the forming process, so that the material realizes the optimal flow state and molecular arrangement in the mold, thereby obtaining a lens matrix with good size stability and optical uniformity.

[0021] Preferably, in step S5, the multi-layer composite coating includes an anti-reflective coating, an anti-static coating, and a self-cleaning coating, and the total thickness of the coating is in the range of 50-300 nm, the surface resistivity of the anti-static coating is set to 10 6 -10 9 Ω / sq.

[0022] By adopting the technical scheme, the anti-reflection coating reduces surface reflection through a metal oxide multilayer film structure with a specific refractive index, the antistatic coating adjusts surface conductivity by using a conductive polymer or metal oxide material, and the self-cleaning coating improves surface properties by using a nano-structured titanium dioxide or other photocatalytic material. Accurate control of the total thickness of the coating ensures good synergy between the functional layers, which not only ensures the full play of the functions of the coating, but also does not adversely affect the optical properties of the lens substrate. The surface resistivity of the antistatic coating is set based on the balance between static electricity dissipation and use safety, which can effectively prevent dust adsorption and avoid potential risks caused by low resistance. This multi-layer composite coating system realizes the comprehensive improvement of the surface properties of the lens through accurate thickness control and material ratio.

[0023] Preferably, in step S7, ultraviolet irradiation is simultaneously implemented during the heat treatment process, and the wavelength of the ultraviolet light is 365-405nm.

[0024] By adopting the technical scheme, by simultaneously implementing ultraviolet irradiation with a wavelength of 365-405nm during the heat treatment process, the selection of this specific wavelength range is based on the synergistic effect of the photochemical properties of the material and the thermal activation mechanism. The ultraviolet energy in this wavelength range can effectively stimulate the molecular structure transformation in the photochromic compound, and at the same time, cooperate with the thermal motion energy provided by the heat treatment to promote the full implementation of the crosslinking reaction inside the material. Based on the thermal environment provided by the heat treatment, the ultraviolet irradiation further induces the molecular rearrangement of the surface and shallow layer of the material. This photo-thermal synergistic effect helps to stabilize the microstructure formed in the processing process of the material. The ultraviolet light of a specific wavelength can also activate some functional groups in the material, enhancing the interfacial bonding force between components. This combined processing method realizes the deep optimization of material properties by accurately controlling the timing and intensity parameters of photo-thermal action, providing a guarantee for the size stability and optical performance maintenance of the lens in the subsequent use process.

[0025] In summary, the present application has the following beneficial effects: 1. The present application adopts a personalized optical design method, which is based on multi-dimensional eye parameters such as user eye curvature radius, eye axis length and pupil diameter for lens customization. The computer-aided design generates an optical surface that matches the user's eye characteristics, and accurately sets key parameters such as lens center thickness, edge thickness and curvature radius, so that the manufactured lens can better adapt to individual differences of users, realizing truly personalized vision correction and effectively improving the matching degree of the lens and the user's eye structure.

[0026] 2、In the application, the blend of polycarbonate and cyclic olefin copolymer is preferably used as the matrix material, and the core-shell quantum dots and the photochromic compound are combined to construct a composite optical material system. The uniform dispersion of functional materials is realized by the process of ultrasonic oscillation and melt blending. This material combination and processing method make the lens have better optical performance, better structural stability and better functional reliability, which provides a guarantee for the long-term use performance of the lens.

[0027] 3、The method of the application combines the multi-stage pressure control micro-injection molding process with synergistic stabilization treatment. In the lens forming process, the pressure is controlled in stages, and heat treatment and ultraviolet irradiation are used at the same time. A multi-layer composite coating containing anti-reflection, anti-static and self-cleaning functions is applied. This multi-process optimization makes the internal structure of the lens more dense and uniform, and the surface performance is improved, thereby obtaining a lens product with more excellent comprehensive performance. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a manufacturing method flow chart of a customized myopia prevention and control lens provided by the application. DETAILED DESCRIPTION

[0029] The application will be further described in detail below in combination with examples and comparative examples. Unless otherwise specified, the experimental methods used below are conventional methods. The materials, reagents, methods and instruments used, unless otherwise specified, are conventional materials, reagents, methods and instruments in the art, which can be obtained by commercial channels or prepared according to literature methods by those skilled in the art.

[0030] Technical ideas: In the existing myopia prevention and control lens manufacturing technology, there is a common problem of insufficient adaptability. The core reason is that the related technology is based on basic parameters such as user diopter, ignoring the significant differences in eye structure parameters such as eyeball curvature radius, eye axis length and pupil diameter among different individuals. This design idea leads to the fact that the key structures such as the optical surface shape and thickness distribution of the lens cannot form accurate matching with the physiological characteristics of the user's eyes, making it difficult for the lens to meet the optical needs of the individual's eyes in the correction process, thereby affecting the pertinence and stability of the correction effect.

[0031] The technical scheme is aimed at the above problems, and solves the problems by the technical means of combination of multi-dimensional eye parameter collection and individualized optical design: first, specific eye structure parameters such as eyeball curvature radius, eye axis length and pupil diameter of a user are obtained through optical measurement, and individual eye features are comprehensively captured; then, based on the parameters, an optical surface matched with the eye features of the user is generated by computer-aided design, and parameters such as lens center thickness, edge thickness and curvature radius are accurately set, so that the lens structure can adapt to individual differences from the optical surface to the thickness distribution, thereby solving the problem of insufficient adaptability caused by neglecting multi-dimensional eye parameters in the prior art Preparation Example 1 The preparation method of the core-shell structure quantum dot is as follows: 0.5 mmol of selenium powder, 0.5 mmol of cadmium chloride and 10 mL of octadecene were weighed into a three-necked flask, and stirred under nitrogen protection, and heated to 220-260 DEG C, and kept for 30-60 minutes to form a cadmium selenide core quantum dot precursor, and the core size was adjusted to 2-10 nm by controlling the reaction time; then, the temperature was lowered to 180-200 DEG C, 1 mmol of zinc chloride and 1 mmol of sulfur powder were dispersed in 5 mL of octadecene to form a mixed solution, which was slowly dropped into the flask, and kept for 40-80 minutes to form a zinc sulfide shell on the surface of the cadmium selenide core; after the reaction, the temperature was cooled to room temperature, 30 mL of anhydrous ethanol was added to precipitate, 3000 rpm centrifugation was carried out for 10 minutes to collect the precipitate, 10 mL of n-hexane was used to wash 3-5 times, and finally it was placed in a 60-80 DEG C vacuum drying oven for drying for 2-4 hours to obtain core-shell structure quantum dots with a purity of ≥98%.

[0032] The following are the main raw materials and reagents used in the preparation examples, examples and comparative examples, the sources and specifications are as follows: the reagents not specifically mentioned are all commercially available analytical grade and above grade products: Polycarbonate was purchased from Pascale Pharmaceutical Technology (Shanghai) Co., Ltd., CAS: 25037-45-0.

[0033] Cycloolefin copolymer was purchased from Dongguan Suguo Plastic Raw Material Co., Ltd., item number: 6017S-04.

[0034] Photochromic compound (diaryl ethylene) was purchased from Shanghai Zhenzhun Biological Technology Co., Ltd.

[0035] Organic solvent (1-octadecene) was purchased from Jiangsu Congzhong Chemical Co., Ltd., item number: 30285. Example

[0036] The embodiment is aimed at myopia patients of 10-14 years old teenagers, and provides a manufacturing method of customized myopia prevention lens, which is a period of rapid eye development, and needs to consider vision correction and myopia prevention functions. The specific steps are as follows: S1, User eye parameter collection: Obtain the eyeball curvature radius, eye axis length and pupil diameter data of the user through optical measurement, and record the vision correction requirement; Among them, for the typical eye characteristics of users in this age group, the eyeball curvature radius range is 7.75 mm, the eye axis length range is 24.0 mm, and the pupil diameter range is 5.0 mm. These parameters reflect the typical state of adolescent eyeball development.

[0037] S2, Individualized optical design: Based on the data collected in S1, the optical surface of the lens is generated through computer-aided design, and the thickness parameter and curvature radius of the lens are set; Among them, considering the greater activity intensity of adolescents, the optical surface design of the lens includes setting the lens center thickness to 1.25 mm to maintain sufficient strength, the edge thickness to 2.0 mm to ensure wearing comfort, and the lens curvature radius to be adjusted within the appropriate range according to the specific vision condition of the user.

[0038] S3, Material selection and pretreatment: Select a high polymer matrix material, add photochromic compounds and quantum dot materials to the matrix material to form a composite optical material, and after standing treatment in an environment with temperature 25°C and humidity 50% for 2h, a circular blank with a diameter of 65mm is made; Among them, considering the diversity of adolescent use scenarios, the high polymer matrix material is a blend of polycarbonate and cyclic olefin copolymer with a refractive index of 1.585, which ensures both optical performance and good impact resistance; Among them, the quantum dot material is a core-shell quantum dot with cadmium selenide as the core and zinc sulfide as the shell, with a size of 6nm, and the addition amount accounts for 0.275% of the total mass of the material. This ratio can control the cost while ensuring the optical performance; Among them, the mixing is done by first dispersing the photochromic compound and quantum dot material in an organic solvent, then treating it with ultrasonic oscillation to form a functional mother liquor, then pre-mixing with the matrix material, and finally completing the melt blending and granulation through a twin-screw extruder; Among them, the power of ultrasonic oscillation treatment is 300W, and the treatment time is 10 minutes to ensure that the materials are fully dispersed; the processing temperature of melt blending is 175°C, and the screw speed is 100rpm, which ensures the stability of the material performance.

[0039] S4, Lens forming: The blank in S3 is formed into a preliminary lens structure through micro-injection molding process under the conditions of pressure 10MPa and temperature 175°C, and the cooling rate is controlled within the range of 1.25°C / s; In the micro-injection molding process, multi-stage pressure control is adopted, wherein the first stage pressure is 7.5 MPa, the second stage pressure is 12.5 MPa, and the pressure switching time is 1.25 s. This control mode helps to reduce the stress in the lens.

[0040] S5, surface finishing: edge grinding and polishing treatment is performed on the lens formed in S4 to control the surface roughness to be between 0.055 μm, and a multi-layer composite coating is applied; In view of the fact that teenagers are prone to stain during use, the multi-layer composite coating includes an anti-reflection coating, an anti-static coating and a self-cleaning coating, the total thickness of the coating is in the range of 175 nm, the surface resistivity of the anti-static coating is set to 10 7 . 5 Ω / sq, which can effectively prevent dust adsorption.

[0041] S6, optical performance test: the lens is placed in an optical test environment, and the transmittance is measured and dynamic vision simulation test is performed under the condition of light intensity of 300 lx to simulate the classroom lighting environment.

[0042] S7, material stabilization treatment: the lens is subjected to heat treatment at a temperature in the range of 65 °C for a time of between 20 min; In the heat treatment process, ultraviolet irradiation is simultaneously implemented, and the wavelength of the ultraviolet light is 385 nm. This step helps to improve the environmental stability of the material.

[0043] S8, packaging and labeling: the lenses that pass the test are packaged and labeled with user personalized parameters and manufacturing date. Embodiment

[0044] This embodiment is aimed at myopic patients aged 6-10 years old. The eyes of users in this age group are in a rapid development period, and the lightness and safety of the lens need to be considered. The specific steps are as follows: S1, user eye parameter acquisition: the eyeball curvature radius, eye axis length and pupil diameter data of the user are obtained through optical measurement, and the vision correction requirement is recorded; In view of the small facial features of children, the eyeball curvature radius is in the range of 7.0 mm, the eye axis length is in the range of 22.0 mm, and the pupil diameter is in the range of 2.0 mm. These parameters meet the eye physiological characteristics of young children.

[0045] S2, personalized optical design: based on the data collected in S1, the optical surface of the lens is generated through computer-aided design, and the thickness parameters and curvature radius of the lens are set; In view of the light weight design requirement of children's lenses, the optical surface design of the lens includes setting the center thickness of the lens to be 0.5 mm and the edge thickness to be 1.0 mm, so as to reduce the weight as much as possible under the premise of ensuring the optical performance.

[0046] S3, material selection and pretreatment: select a polymer matrix material, add photochromic compounds and quantum dot materials to the matrix material to form a composite optical material, and then place it in an environment with a temperature of 20°C and a humidity of 40% for 1 hour to form a circular blank with a diameter of 50mm; Among them, considering the large amount of activity of children, the polymer matrix material is polycarbonate with a refractive index of 1.50, which has excellent impact resistance; Among them, the quantum dot material is a core-shell quantum dot with cadmium selenide as the core and zinc sulfide as the shell, and the size is 2nm, and the addition amount is 0.05% of the total mass of the material. Smaller quantum dot size is more suitable for children's sensitive visual system; Among them, the mixing is by first dispersing the photochromic compound and quantum dot material in an organic solvent, then ultrasonic oscillation treatment to form a functional mother liquor, then dry pre-mixing with the matrix material, and finally melt blending and granulation by a twin-screw extruder; Among them, the power of ultrasonic oscillation treatment is 100W, and the treatment time is 5 minutes; the processing temperature of melt blending is 160°C, and the screw rotation speed is 50rpm. Mild process parameters are more suitable for the manufacture of children's lenses.

[0047] S4, lens forming: the blank in S3 is formed into a preliminary lens structure by micro-injection molding process under the conditions of pressure 5MPa and temperature 150°C, and the cooling rate is controlled within the range of 0.5°C / s; Among them, the micro-injection molding process adopts multi-stage pressure control, in which the first stage pressure is 5MPa and the second stage pressure is 10MPa, and the pressure switching time is 0.5s.

[0048] S5, surface finishing: edge grinding and polishing treatment is performed on the lens formed in S4 to control the surface roughness within 0.01μm, and a multi-layer composite coating is applied; Among them, considering the use habits of children, the multi-layer composite coating includes an anti-reflection coating, an anti-static coating and a self-cleaning coating, the total thickness of the coating is within the range of 50nm, and the surface resistivity of the anti-static coating is set to 10 6 Ω / sq, which is convenient for cleaning and maintenance.

[0049] S6, optical performance test: the lens is placed in an optical test environment, and the transmittance is measured and dynamic vision simulation test is carried out under the condition of light intensity 100lx to simulate indoor reading environment.

[0050] S7, material stabilization treatment: heat treatment is performed on the lens, the temperature is within the range of 50°C, and the time is within the range of 10min; The ultraviolet irradiation is performed synchronously during the heat treatment process, and the wavelength of the ultraviolet light is 365 nm.

[0051] S8, packaging and labeling: the lenses that pass the test are packaged and labeled with personalized parameters of the user and the manufacturing date. Embodiment

[0052] This embodiment is directed to teenagers and adults over the age of 15 with high myopia. This user group requires high-precision vision correction while also considering aesthetic needs. The specific steps are as follows: S1, user eye parameter acquisition: obtain the eyeball curvature radius, eye axis length, and pupil diameter data of the user through optical measurement, and record the vision correction requirements; Among them, for the developed eye structure, the eyeball curvature radius range is 8.5mm, the eye axis length range is 26.0mm, and the pupil diameter range is 8.0mm, which reflects the typical characteristics of adult eyeballs.

[0053] S2, personalized optical design: based on the data collected in S1, the optical surface of the lens is generated through computer-aided design, and the thickness parameters and curvature radius of the lens are set; Among them, considering the sensitivity of high myopia users to the edge thickness of the lens, the optical surface design of the lens includes setting the center thickness of the lens to 2.0mm and the edge thickness to 3.0mm, and optimizing the design to reduce the edge thickness and improve the aesthetics.

[0054] S3, material selection and pretreatment: select a high molecular polymer matrix material, add photochromic compounds and quantum dot materials to the matrix material to form a composite optical material, and after 3h of static treatment in an environment with a temperature of 30°C and a humidity of 60%, a circular blank with a diameter of 80mm is prepared; Among them, considering the demand of adult users for thin lenses, the high molecular polymer matrix material is a cyclic olefin copolymer with a refractive index of 1.67, which helps to achieve thin lens design; Among them, the quantum dot material is a core-shell quantum dot with indium phosphide as the core and zinc sulfide as the shell, with a size of 10nm, and the addition amount accounts for 0.5% of the total mass of the material. This configuration can provide more abundant optical control capability; Among them, the mixing is first carried out by dispersing the photochromic compound and the quantum dot material in an organic solvent, then performing ultrasonic oscillation treatment to form a functional mother liquor, and then carrying out dry pre-mixing with the matrix material, and finally completing the melt blending and granulation through a twin-screw extruder; Among them, the power of ultrasonic oscillation treatment is 500W, and the treatment time is 15 minutes; the processing temperature of melt blending is 190°C, and the screw speed is 150rpm. These parameters ensure the full fusion of high refractive index materials.

[0055] S4, lens forming: the blank in S3 is formed into a preliminary lens structure by a micro-injection molding process under a pressure of 15 MPa and a temperature of 200°C, and the cooling rate is controlled to be within a range of 2.0°C / s; wherein the micro-injection molding process adopts multi-stage pressure control, wherein the first-stage pressure is 10 MPa, the second-stage pressure is 15 MPa, and the pressure switching time is 2.0s.

[0056] S5, surface finishing: the lens formed in S4 is edge polished and polished to control the surface roughness to be within 0.1μm, and a multi-layer composite coating is applied; wherein, considering the diversity of use scenarios of adult users, the multi-layer composite coating includes an anti-reflection coating, an anti-static coating, and a self-cleaning coating, the total thickness of the coating is within a range of 300nm, the surface resistivity of the anti-static coating is set to 10 9 Ω / sq, and better dustproof effect is provided.

[0057] S6, optical performance testing: the lens is placed in an optical testing environment, and transmittance measurement and dynamic vision simulation testing are performed under a light intensity of 500lx to simulate an outdoor strong light environment.

[0058] S7, material stabilization treatment: the lens is subjected to heat treatment at a temperature within a range of 80°C for a time within a range of 30min; wherein, the ultraviolet irradiation is simultaneously implemented during the heat treatment process, and the wavelength of the ultraviolet is 405nm, and this combined treatment can improve the long-term use stability of the lens.

[0059] S8, packaging and labeling: the lens that passes the testing is packaged and labeled with user personalized parameters and manufacturing date.

[0060] Comparative Example 1 The only difference between this comparative example and Example 1 is that in step S3, the high polymer matrix material is only polycarbonate, and does not contain a cyclic olefin copolymer, and other materials and process parameters are exactly the same as in Example 1.

[0061] Comparative Example 2 The only difference between this comparative example and Example 1 is that in step S3, the quantum dot material is only cadmium selenide quantum dots, and does not contain a zinc sulfide shell structure, and other materials and process parameters are exactly the same as in Example 1.

[0062] Comparative Example 3 The only difference between this comparative example and Example 1 is that in step S3, no photochromic compound is added, and only the quantum dot material is retained, and other materials and process parameters are exactly the same as in Example 1.

[0063] Comparative Example 4 The only difference between this comparative example and Example 1 is that in Step S3, the mixing process adopts a one-time melt blending process without ultrasonic oscillation treatment and functional mother liquor preparation step, and other process parameters are exactly the same as those in Example 1.

[0064] Comparative Example 5 The only difference between this comparative example and Example 1 is that in Step S7, only heat treatment is performed without ultraviolet irradiation, and other process parameters are exactly the same as those in Example 1.

[0065] Test Item One: Comprehensive Test of Optical Performance According to GB / T10810.4-2012 “Spectacle Lenses Part 4: Optical Performance Requirements and Test Methods”, 3 pieces of lens samples of Examples 1-3 and Comparative Examples 1-5 are selected, and all samples are placed in a standard environment of 25°C and 50% humidity for 24h. Using a Lambda950 ultraviolet-visible spectrophotometer, the transmittance of each sample center and 3 different points 5mm away from the edge in the visible light wavelength range of 380nm-780nm is measured, and the blue light blocking rate of each point in the blue light wavelength range of 400nm-450nm is measured. The test data of each sample is the average value of 3 points, and the transmittance and blue light blocking rate values of all samples are recorded.

[0066] Test Item Two: Environmental Stability Test According to GB / T18318-2001 “Spectacle Lenses Anti-aging Performance Test Method”, 3 pieces of lens samples of Examples 1-3 and Comparative Examples 1-5 are placed in a high-low temperature test chamber, and the test cycle program is set as -20°C constant temperature for 2h, then quickly heated to 60°C constant temperature for 2h, completing one cycle for 4h, and a total of 5 cycles of test are carried out. After the test, all samples are taken out and placed in a standard environment of 25°C and 50% humidity for 24h, and then the transmittance and blue light blocking rate of each sample are measured again according to the same test standard and operation steps of Test Item One, and the transmittance retention rate and blue light blocking rate retention rate of each sample after cycling are calculated, wherein the calculation formula is as follows: By comparing the performance retention rates of different samples, the effects of material stabilization process, matrix material and functional material structure on the long-term use stability of the lens are evaluated.

[0067] Test Item Three: Impact Resistance Test According to the drop ball impact test standard in GB / T 10810.3-2006 "Ophthalmic lenses Part 3: Mechanical resistance requirements and test methods", prepare 3 pieces of lens samples of Examples 1-3 and Comparative Examples 1-5, respectively, and fix all samples on special lens clamps to ensure uniform stress and no looseness. Select a stainless steel ball with a diameter of 16 mm and a mass of 104 g, and drop it from a fixed height of 1.27 m to impact the center area of each sample. Each sample is tested continuously for 3 times, and after each impact, observe and record whether the lens has any damage such as cracking, cracking, edge collapse, etc. Calculate the pass rate of each sample in the impact test, and the formula is as follows: Compare the test results of different samples to verify the influence of the composition of the base material and the forming process on the mechanical strength of the lens.

[0068] The experimental data of Examples 1-3 and Comparative Examples 1-5 are shown in Table 1.

[0069] Item Transmittance (%) Blue light barrier rate (%) Transmittance retention rate (%) Blue light barrier retention rate (%) Impact resistance test passing rate (%) Example 1 94.2 32.5 98.6 97.8 91.7 Example 2 95.7 28.3 99.1 98.2 100.0 Example 3 93.5 38.7 98.3 97.5 88.9 Comparative Example 1 93.8 32.1 97.2 96.5 77.8 Comparative Example 2 92.6 27.9 95.3 92.1 90.0 Comparative Example 3 95.1 18.4 96.8 89.7 91.1 Comparative Example 4 90.3 29.5 94.7 93.3 87.8 Comparative Example 5 94.0 32.3 92.5 90.9 90.6 Notes: 1. All data are the average of 3 sample test results, with 1 decimal place; 2. Light transmittance retention rate = (light transmittance after high-low temperature cycle / light transmittance before cycle) x 100%; 3. Blue light barrier retention rate = (blue light barrier after high-low temperature cycle / blue light barrier before cycle) x 100%; 4. Impact resistance test pass rate = (number of tests without damage / total number of tests) x 100%, each sample is tested for a total of 3 times, and 8 samples are tested for a total of 24 times.

[0070] The manufacturing process of customized myopia prevention and control lenses and the key performance influencing factors are as follows: As can be seen from Examples 1-3 and Comparative Example 1 and Table 1, the composition of the base material will affect the overall performance of the lens. The blending combination of polycarbonate and cyclic olefin copolymer can better improve the environmental stability and impact resistance of the lens compared to a single polycarbonate matrix. This is because the blending of the two polymers can optimize the structural compatibility of the material, enhance the internal bonding force, and at the same time, take into account the light transmittance required for optical performance and the toughness required for mechanical performance, so that the lens can maintain good performance stability after experiencing environmental changes, and can better resist damage when subjected to external impact.

[0071] It can be seen from Examples 1-3 and Comparative Example 2 in combination with Table 1 that the structural morphology of the quantum dot material affects the optical performance and environmental stability of the lens. The quantum dot with a core-shell structure is more conducive to playing a blue light blocking function and maintaining long-term stability than the single core material quantum dot. This is because the zinc sulfide shell can protect the cadmium selenide core, reduce its performance decay during processing and use, and improve the dispersion stability of the quantum dot in the base material, avoiding the influence of agglomeration on the optical effect, so that the lens performs better in terms of blue light blocking and performance maintenance.

[0072] It can be seen from Examples 1-3 and Comparative Example 3 in combination with Table 1 that the use of functional materials in combination has a synergistic effect. The co-addition of the photochromic compound and the quantum dot can improve the blue light blocking performance and environmental stability of the lens more than the use of the quantum dot alone. This is because the photochromic compound and the quantum dot can cooperate with each other in terms of optical function, and together enhance the control ability of specific wavelength light. At the same time, the interaction of the two materials can also optimize their state of existence in the matrix, reduce the performance fluctuations that may occur when a single material is used, and maintain stable blue light blocking effect of the lens in long-term use.

[0073] It can be seen from Examples 1-3 and Comparative Example 4 in combination with Table 1 that the degree of refinement of the mixing process affects the overall performance of the lens. The mixing method of ultrasonic oscillation processing combined with functional mother liquor preparation can better ensure the uniform dispersion of functional materials in the matrix than one-time melt blending. Uniformly dispersed functional components can make the optical performance of the lens more stable, avoid local performance differences, and also enhance the structural consistency of the material, improve environmental stability and impact resistance, and reduce local weak points caused by uneven distribution of components, so that the lens can maintain better performance in various tests.

[0074] It can be seen from Examples 1-3 and Comparative Example 5 in combination with Table 1 that the composite method of material stabilization treatment can improve the performance retention rate of the lens more than single heat treatment. The synergistic effect of heat treatment and ultraviolet irradiation can further promote the chemical bond between the functional material and the matrix material, enhance the stability of the internal structure of the material, reduce the influence of environmental factors on the performance of the lens, and maintain the initial light transmittance and blue light blocking function of the lens after environmental tests such as high and low temperature cycles, thereby prolonging the effective service life of the lens.

[0075] The specific embodiments are merely an explanation of the present application, which is not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A method for manufacturing customized myopia control lenses, characterized in that: Includes the following steps: S1. User eye parameter acquisition: Obtain user's eyeball curvature radius, axial length and pupil diameter data through optical measurement, and record vision correction needs; S2, Personalized Optical Design: Based on the data collected by S1, the optical surface of the lens is generated through computer-aided design, and the thickness parameters and radius of curvature of the lens are set. S3. Material selection and pretreatment: Select a high-molecular polymer matrix material, add photochromic compound and quantum dot material to the matrix material to form a composite optical material, and after standing in an environment of 20-30°C and 40-60% humidity for 1-3 hours, make a circular blank with a diameter of 50-80mm. S4. Lens Forming: The blank in S3 is formed by micro-injection molding under a pressure of 5-15MPa and a temperature of 150-200°C to form a preliminary lens structure, and the cooling rate is controlled within the range of 0.5-2.0°C / s. S5. Surface finishing: The S4-formed lens is ground and polished to control the surface roughness between 0.01-0.1μm, and a multi-layer composite coating is applied. S6. Optical performance test: Place the lens in an optical test environment and perform transmittance measurement and dynamic visual simulation test under light intensity of 100-500 lx. S7. Material stabilization treatment: The lens is heat-treated at a temperature of 50-80°C for 10-30 minutes. S8. Packaging and Marking: Package the tested lenses and mark them with the user's personalized parameters and manufacturing date.

2. The manufacturing method of a customized myopia control lens according to claim 1, characterized in that: In step S1, the radius of curvature of the eyeball ranges from 7.0 to 8.5 mm, the axial length ranges from 22.0 to 26.0 mm, and the pupil diameter ranges from 2.0 to 8.0 mm.

3. The manufacturing method of a customized myopia control lens according to claim 1, characterized in that: In step S2, the optical surface design of the lens includes setting the center thickness of the lens to be between 0.5-2.0 mm and the edge thickness to be between 1.0-3.0 mm.

4. The manufacturing method of a customized myopia control lens according to claim 1, characterized in that: In step S3, the polymer matrix material is a blend of polycarbonate and cyclic olefin copolymer with a refractive index between 1.50 and 1.

67.

5. The method for manufacturing a customized myopia control lens according to claim 1, characterized in that: In step S3, the quantum dot material is a core-shell structured quantum dot, which has cadmium selenide as the core and zinc sulfide as the shell, with a size of 2-10 nm, and the amount added accounts for 0.05-0.5% of the total mass of the material.

6. The manufacturing method of a customized myopia control lens according to claim 1, characterized in that: In step S3, the mixing is achieved by first dispersing the photochromic compound and quantum dot material in an organic solvent, then treating it with ultrasonic oscillation to form a functional mother liquor, then dry premixing it with the matrix material, and finally completing the melt blending granulation through a twin-screw extruder.

7. The method for manufacturing a customized myopia control lens according to claim 6, characterized in that: The ultrasonic oscillation treatment has a power of 100-500W and a treatment time of 5-15 minutes; the melt blending processing temperature is 160-190°C and the screw speed is 50-150rpm.

8. The method for manufacturing a customized myopia control lens according to claim 7, characterized in that: In step S4, the micro-injection molding process adopts multi-stage pressure control, wherein the first stage pressure is 5-10MPa, the second stage pressure is 10-15MPa, and the pressure switching time is between 0.5-2.0 seconds.

9. The method for manufacturing a customized myopia control lens according to claim 1, characterized in that: In step S5, the multilayer composite coating includes an anti-reflective coating, an antistatic coating, and a self-cleaning coating. The total thickness of the coating is in the range of 50-300 nm, and the surface resistivity of the antistatic coating is set to 10. 6 -10 9 Ω / sq.

10. The method for manufacturing a customized myopia control lens according to claim 1, characterized in that: In step S7, ultraviolet irradiation is performed simultaneously during the heat treatment process, with an ultraviolet wavelength of 365-405nm.

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