Photochromic multi-point defocus myopia control lens and its preparation method, system, electronic device, and medium.

Abstract

This invention provides a photochromic multi-point defocus myopia control lens and its preparation method, system, electronic device, and medium, relating to the interdisciplinary field of optical devices and additive manufacturing. The method employs a multi-material inkjet additive manufacturing process, depositing a basic optical layer, a composite functional layer (a composite layer of a photochromic functional layer and an optical compensation control layer), and a distributed defocus microstructure layer according to a preset molding logic. All functional layers are integrally molded, avoiding interface stress and optical distortion. The photochromic functional layer contains spiropyran dye and nano-titanium dioxide, achieving rapid response and high weather resistance. The optical compensation control layer has negative dispersion characteristics, dynamically offsetting focus drift caused by color change. The technology of this application solves the problems of defocus structure failure, unstable optical performance, and heavy structure caused by refractive index fluctuations in traditional photochromic lenses during the color-changing process.

Description

Technical Field

[0001] This invention relates to the interdisciplinary field of optical devices and additive manufacturing, specifically to a photochromic multi-point defocus myopia control lens and its preparation method, system, electronic device, and medium. Background Technology

[0002] With the global rate of myopia among teenagers rising, myopia prevention and control has become a core focus in optometry. Multi-point defocus lenses can create a positive defocus signal in the peripheral retina, inhibiting abnormal axial elongation and serving as a key means to slow myopia progression. Photochromic lenses can dynamically adjust light transmittance and color depth according to ambient light, blocking ultraviolet rays, suppressing glare, and improving visual comfort and convenience. Integrating these two technologies to create lenses that combine myopia control and environmental adaptability is becoming an important trend in industry technology development.

[0003] Composite functional lenses are constructed using additive manufacturing processes. Through layer-by-layer controllable deposition, photoresponsive materials and micro-optical structures are collaboratively constructed in three-dimensional space. This breaks through the limitations of traditional coating or molding processes in terms of structural freedom and functional coupling precision, and provides a new path for achieving high-precision conformal integration of photochromic and multi-point defocus structures.

[0004] However, this technology has significant drawbacks: when photochromic materials are excited by ultraviolet light, the molecular configuration change leads to nonlinear changes in optical parameters such as refractive index and Abbe number. This causes the pre-set wavefront modulation function of the multi-point defocus microstructure to shift, resulting in problems such as defocus attenuation and focus blurring, thus weakening the stability of myopia control effects. Even when the photochromic group is embedded in the matrix, the color change still induces local optical inhomogeneity, disrupting the phase consistency of the microstructure array. Furthermore, the multi-layered stacked structure used to compensate for optical disturbances increases lens thickness, affecting wearing comfort. Poor interfacial compatibility between different functional components may also lead to performance degradation during long-term use, with problems being more pronounced in scenarios with frequent switching between strong and weak light, thus hindering its clinical translation.

[0005] Based on this, this application proposes an optically stable photochromic multi-point defocus myopia control lens based on additive manufacturing to solve one or more of the above-mentioned problems. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this invention provides a photochromic multi-point defocus myopia control lens and its preparation method, system, electronic device, and medium, which solves the problems of defocus structure failure, unstable optical performance, and heavy structure caused by refractive index fluctuations during the color-changing process of traditional photochromic lenses.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] Firstly, this application proposes a photochromic multi-point defocus myopia control lens, the lens comprising:

[0011] The basic optical layer is used to form the main structure of the lens and provide basic refractive correction function;

[0012] A distributed defocus microstructure layer, comprising several microstructure units, wherein the radius of curvature of each microstructure unit is adapted to the wearer's personalized defocus needs;

[0013] A composite functional layer, comprising a photochromic functional layer and an optical compensation and control layer that are spatially completely overlapping and dynamically complementary in refractive index;

[0014] The basic optical layer, the distributed defocus microstructure layer, and the composite functional layer are arranged sequentially along the direction of the wearer's line of sight, or the basic optical layer, the composite functional layer, and the distributed defocus microstructure layer are arranged sequentially along the direction of the wearer's line of sight; and adjacent layers are connected by chemical bonding.

[0015] In one embodiment, the lens further includes:

[0016] A surface protective layer is chemically bonded to the front surface of the composite functional layer or the distributed defocus microstructure layer, wherein the front surface refers to the surface at the front of the wearer's line of sight; and / or

[0017] A functional transition region is provided at the edge of the lens, wherein the concentration of the photochromic material in the functional transition region decreases radially relative to the thickness of the optical compensation control layer; and / or

[0018] An anti-reflective coating is disposed on the rear surface of the base optical layer, wherein the rear surface refers to the surface at the rear end in the direction of the wearer's line of sight.

[0019] In one embodiment, the material of the basic optical layer includes polyurethane acrylate resin; the photochromic functional layer is composed of spiropyran organic molecules uniformly dispersed in a photocurable resin matrix; and the optical compensation and control layer is composed of siloxane resin doped with nano-titanium dioxide particles.

[0020] Secondly, this application further proposes a method for preparing a photochromic multi-point defocus myopia control lens as described in any of the above claims, the method comprising:

[0021] Acquire the wearer's ocular biometric data and personalized visual needs parameters;

[0022] Based on ocular biometric data and personalized visual requirement parameters, a personalized optical model of the wearer's eyeball is constructed, and the distribution map of the defocus amount required by the wearer's retina under different field of view is calculated.

[0023] Based on the defocus distribution map, the spatial arrangement parameters and geometric morphology parameters of the distributed defocus microstructure layer including several microstructure units are obtained, and a three-dimensional geometric model file of all microstructure units is generated based on the spatial arrangement parameters and geometric morphology parameters.

[0024] The predetermined materials, including basic optical resin materials, photochromic functional materials, and optical compensation and control materials, are loaded into the independent material cavities of the multi-material inkjet additive manufacturing equipment.

[0025] Start the additive manufacturing equipment and spray material layer by layer according to the preset molding logic and deposit and solidify it.

[0026] In one embodiment, ocular biometric data includes, but is not limited to, corneal curvature, axial length, pupil diameter, and accommodation hysteresis; personalized visual demand parameters include, but are not limited to, data on the distribution of daily eye use scenarios, data on glare sensitivity, and data on preferences for lens color change speed.

[0027] In a preferred embodiment, non-contact biometrics are used to acquire the wearer's ocular biometric data.

[0028] More preferably, a low-coherence beam is emitted by a non-contact biometer to scan the anterior segment of the wearer's eyeball and reconstruct the curvature of the anterior and posterior surfaces of the cornea, the depth of the anterior chamber, the thickness of the lens, and the total length of the axial length.

[0029] The pupil edge contour is captured by an infrared camera system and its equivalent circle diameter is calculated;

[0030] The hysteresis difference between the accommodative response curve and the ideal accommodative curve when the wearer fixates on a target at different distances is measured by dynamic retinoscopy.

[0031] In a preferred embodiment, data such as the wearer's time spent in indoor office, outdoor activities, and nighttime driving scenarios, subjective discomfort ratings for glare under strong light, and expectations for the lens color change speed are collected through a standardized questionnaire.

[0032] In one embodiment, the personalized optical model is constructed using a ray tracing algorithm. The input of the personalized optical model is the incident direction of parallel incident rays at different field of view angles, and the output is the focal position of the rays on the retinal plane.

[0033] In a further preferred embodiment, for wearers whose adjustment hysteresis is greater than a preset value, the personalized optical model introduces a negative defocus offset when calculating the defocus amount to compensate for hyperopic defocus.

[0034] In one embodiment, the spatial arrangement parameters include the latitude and longitude coordinates of the center point of the microstructure unit on the lens surface; the geometric morphology parameters include the radius of curvature, sag, and edge transition slope of each microstructure unit.

[0035] Preferably, based on the thin lens formula, the required defocus amount is converted into the local curvature of the microstructure unit to obtain the geometric parameters.

[0036] In one embodiment, the basic optical resin material is used to deposit a basic optical layer and a distributed defocusing microstructure layer, the photochromic functional material is used to deposit a photochromic functional layer, and the optical compensation control material is used to deposit an optical compensation control layer.

[0037] In one embodiment, the three materials—the basic optical resin material, the photochromic functional material, and the optical compensation and control material—all contain photocurable acrylate groups in their chemical structures.

[0038] In one embodiment, the additive manufacturing equipment is equipped with a high-precision piezoelectric nozzle array and an ultraviolet curing module.

[0039] In one embodiment, each of the material cavities is equipped with a constant temperature control system.

[0040] In a preferred embodiment, the basic optical resin material, photochromic functional material, and optical compensation control material are all subjected to vacuum degassing treatment before loading the materials.

[0041] In one embodiment, the forming logic includes:

[0042] In the first stage, the basic optical resin material is sprayed and deposited to form the basic optical layer;

[0043] In the second stage, a distributed defocused microstructure layer is formed by depositing a three-dimensional geometric model file.

[0044] In the third stage, the photochromic functional material and the optical compensation and control material are mixed and sprayed in the same proportion, and deposited to form a composite functional layer of photochromic functional layer and optical compensation and control layer.

[0045] In the fourth stage, fluorosilicone resin material is sprayed and deposited to form a surface protective layer.

[0046] In another embodiment, the molding logic includes:

[0047] In the first stage, the basic optical resin material is sprayed and deposited to form the basic optical layer;

[0048] In the second stage, the photochromic functional material and the optical compensation and control material are mixed and sprayed simultaneously and in the same proportion, and deposited to form a composite functional layer of photochromic functional layer and optical compensation and control layer.

[0049] In the third stage, a distributed defocused microstructure layer is formed by depositing a three-dimensional geometric model file.

[0050] In the fourth stage, fluorosilicone resin material is sprayed and deposited to form a surface protective layer.

[0051] In one embodiment, the method further includes: during the deposition and curing process of each layer of material, scanning the three-dimensional morphology data of the current layer surface in real time and comparing it with preset theoretical morphology data; if the deviation exceeds a preset threshold, executing a correction command.

[0052] In a preferred embodiment, a laser confocal microscopy module is used to emit a laser beam, and a galvanometer system is used to perform a grid scan on the surface of the current layer. The reflected light signal is received and three-dimensional point cloud data is reconstructed to obtain the three-dimensional topography data of the surface of the current layer.

[0053] In a preferred embodiment, the correction instructions include, but are not limited to, adjusting the droplet volume and landing point coordinates for the next ejection cycle.

[0054] In one embodiment, the method further includes: after the manufacturing of all the layers is completed, optimizing the lens as a whole, the optimization including heat treatment and stress relief, fine grinding and polishing of the lens edges.

[0055] Thirdly, this application also proposes a system for fabricating photochromic multi-point defocus myopia control lenses, the system comprising:

[0056] The data acquisition module is configured to acquire the wearer's ocular biometric data and personalized visual needs parameters;

[0057] The defocus distribution map acquisition module is configured to construct a personalized optical model of the wearer's eyeball based on ocular biometric data and personalized visual requirement parameters, and calculate the defocus distribution map required by the wearer's retina under different field of view angles;

[0058] The distributed defocus microstructure model acquisition module is configured to acquire the spatial arrangement parameters and geometric morphology parameters of the distributed defocus microstructure layer including several microstructure units based on the defocus amount distribution map, and generate a three-dimensional geometric model file of all microstructure units based on the spatial arrangement parameters and geometric morphology parameters.

[0059] The lens manufacturing control module is configured to, after loading predetermined materials, including basic optical resin materials, photochromic functional materials, and optical compensation and control materials, into the independent material cavities of the multi-material inkjet additive manufacturing equipment, start the additive manufacturing equipment, spray materials layer by layer according to the preset molding logic, and deposit and solidify them. The molding logic includes: a second stage, calling a three-dimensional geometric model file to deposit and form a distributed defocus microstructure layer.

[0060] Fourthly, this application further proposes an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method for preparing a photochromic multi-point defocus myopia control lens as described in any of the preceding claims.

[0061] Fifthly, this application proposes a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the method for preparing a photochromic multi-point defocus myopia control lens as described in any of the preceding claims.

[0062] (III) Beneficial Effects

[0063] This invention provides a photochromic multi-point defocus myopia control lens, its preparation method, system, electronic device, and medium. Compared with the prior art, it has the following advantages:

[0064] This application proposes a photochromic multi-point defocus myopia control lens, comprising a basic optical layer for constituting the main structure of the lens and providing basic refractive correction function; a distributed defocus microstructure layer, which includes several microstructure units, each of which has a radius of curvature adapted to the wearer's personalized defocus needs; and a composite functional layer, which includes a photochromic functional layer and an optical compensation and adjustment layer that are spatially completely overlapping and dynamically complementary in refractive index; the basic optical layer, the distributed defocus microstructure layer, and the composite functional layer are arranged sequentially along the direction of the wearer's line of sight, or the basic optical layer, the composite functional layer, and the distributed defocus microstructure layer are arranged sequentially along the direction of the wearer's line of sight; and adjacent layers are connected by chemical bonding. This lens, through the synergistic effect of a precisely designed optical compensation control layer and a photochromic functional layer, dynamically compensates for the optical parameter drift caused by the color depth change of the photochromic material. This ensures that the defocus amount and focal position set by the multi-point defocus structure remain stable, solving the problems of defocus structure failure, unstable optical performance, and heavy structure caused by refractive index fluctuations in traditional photochromic lenses during the color-changing process. Attached Figure Description

[0065] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0066] Figure 1 This is a schematic diagram showing the positions of each functional layer of a photochromic multi-point defocus myopia control lens according to one embodiment of the present invention (Example 1).

[0067] Figure 2 This is a schematic diagram showing the positions of each functional layer of the photochromic multi-point defocus myopia control lens under another embodiment of Embodiment 1 of the present invention;

[0068] Figure 3 This is a flowchart of the method for preparing photochromic multi-point defocus myopia control lenses in Embodiment 2 of the present invention;

[0069] Figure 4 This is an example diagram of the method for preparing photochromic multi-point defocus myopia control lenses in Embodiment 2 of the present invention;

[0070] Figure 5 This is a logical flowchart of the spatial arrangement of the distributed defocus microstructure layer and the matching of retinal defocus requirements in Embodiment 2 of the present invention.

[0071] Figure 6 This is a schematic diagram of the core principle framework for achieving dynamic optical parameter stabilization through the coordinated action of the optical compensation control layer and the photochromic functional layer in Embodiment 2 of the present invention.

[0072] Figure 7 This is a flowchart illustrating the four-stage layer-by-layer forming logic of the multi-material inkjet additive manufacturing process in Embodiment 2 of the present invention.

[0073] Figure 8 This is a schematic diagram of the multi-level interaction relationship and data flow of the real-time morphology monitoring and closed-loop feedback control mechanism between lens functional layers in Embodiment 2 of the present invention;

[0074] Figure 9 This is a comparison diagram of the technical effects / principles of maintaining focus stability under the synergistic effect of photochromism and optical compensation in Embodiment 2 of the present invention and in conventional technology. Detailed Implementation

[0075] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0076] With the global incidence of myopia among teenagers continuing to rise, myopia prevention and control has become a core research direction in the field of optometry. Multi-point defocus lenses, by constructing a positive defocus signal in the peripheral retina, effectively inhibit abnormal axial elongation and have been clinically proven to be a key optical intervention for slowing myopia progression. Meanwhile, photochromic lenses, which dynamically adjust transmittance and color depth according to ambient light intensity to achieve ultraviolet shielding and glare suppression, are widely recognized in the market for improving visual comfort and ease of use. Integrating these two functions into a single lens carrier to construct intelligent optical devices that combine myopia control effectiveness with environmental adaptability has become an important trend in the industry's technological evolution.

[0077] Among these, composite functional lenses constructed using additive manufacturing processes offer a novel approach to achieving high-precision conformal integration of photochromic and multi-point defocus structures. The core objective of this technology is to collaboratively construct photoresponsive materials and micro-optical structures in three-dimensional space through layer-by-layer controllable deposition, thereby overcoming the physical limitations of traditional coating or molding processes in terms of structural freedom and functional coupling precision. However, while achieving functional integration, existing technologies have failed to effectively address the performance disturbances caused by the dynamic drift of intrinsic optical parameters of materials during photochromic processes on precision defocus structures.

[0078] In existing technologies, photochromic materials undergo molecular configuration changes under ultraviolet excitation, resulting in nonlinear changes in their refractive index, Abbe number, and absorption spectrum. This leads to a systematic shift in the wavefront modulation function preset by the multi-point defocus microstructure, manifesting as attenuation of defocus, focal blurring, or increased chromatic aberration, severely weakening the clinical stability of myopia control. Even when photochromic groups are embedded in the matrix using additive manufacturing, the local optical inhomogeneities caused by the color-changing process still disrupt the phase consistency of the microstructure array.

[0079] Furthermore, the multi-layered stacked structure introduced to compensate for optical disturbances often results in excessive lens thickness, affecting wearing comfort; interface compatibility defects between different functional components may also lead to performance degradation during long-term use. These contradictions are particularly prominent in dynamic visual scenarios with frequent switching between strong and weak light, constituting the core technical bottleneck restricting the clinical translation of photochromic multi-point defocus lenses.

[0080] Based on this, the embodiments of this application provide a photochromic multi-point defocus myopia control lens and its preparation method, system, electronic device, and medium, which at least solves the problems of defocus structure failure, unstable optical performance, and heavy structure caused by refractive index fluctuations during the color-changing process of traditional photochromic lenses, thereby achieving the goal of improving the performance stability of photochromic multi-point defocus myopia control lenses.

[0081] The technical solution in this application is to solve the above-mentioned technical problems, and the general idea is as follows:

[0082] This application aims to address the problems of defocus structure failure, unstable optical performance, and heavy structure caused by refractive index fluctuations during the photochromic process of traditional photochromic lenses. The method employs a multi-material inkjet additive manufacturing process, depositing a basic optical layer, a distributed defocus microstructure layer, a photochromic functional layer, and an optical compensation and control layer (consisting of a composite functional layer) according to a pre-defined molding logic. Each functional layer is integrally molded, avoiding interface stress and optical distortion. The photochromic layer contains spiropyran dye and nano-titanium dioxide, achieving rapid response and high weather resistance. The optical compensation and control layer has negative dispersion characteristics, dynamically offsetting focus drift caused by photochromic changes. This lens consists of a multi-layered functional structure, with microstructure units non-uniformly arranged according to the retinal defocus gradient. The thickness of the optical compensation and control layer is precisely calculated based on the refractive index change, and a real-time morphology monitoring and closed-loop feedback mechanism ensure molding accuracy. This application enables the lens to maintain stable defocus and optical performance across the entire photochromic range, with an overall thickness ≤1.2mm and a defocus control error <±0.05D, significantly improving myopia control, wearing comfort, and lifespan.

[0083] Definitions:

[0084] Photochromic materials are a class of materials that can change color when excited by a light source.

[0085] Anterior chamber depth (ACD) is a key anatomical indicator in ophthalmology clinics, referring to the vertical distance between the anterior surface of the cornea and the anterior surface of the lens inside the eyeball.

[0086] Ray tracing algorithm is a key technology that uses mathematical modeling to simulate the propagation, reflection, refraction, absorption, and illumination interaction of light in three-dimensional space to calculate the color and brightness of an object's surface.

[0087] Aqueous humor is a transparent, colorless fluid continuously secreted by the ciliary body (a ring-shaped tissue located between the iris and the lens) in the eyeball. It fills the anterior chamber (the space between the cornea, iris, and lens) and the posterior chamber (the narrow space between the iris, pupil, and lens) at the front of the eyeball.

[0088] Accommodative lag is a core indicator for assessing whether the human eye's accommodative function matches the needs when viewing objects at close range. It refers to the difference between the actual accommodative force generated by the eye when focusing on a close target and the "theoretically required accommodative force".

[0089] Abbe number, the "color fidelity index" of optical materials, is a core physical parameter for measuring the dispersion of transparent optical materials (such as glass and resin). It essentially reflects the difference in the material's ability to refract light of different wavelengths. The higher the Abbe number, the smaller the dispersion of the material, the weaker the "color separation" phenomenon produced after light passes through, and the higher the clarity and color fidelity of the visual image.

[0090] Chemical bonding connection refers to the process of stably combining different molecules, materials, or components through the formation of chemical bonds (such as covalent bonds, ionic bonds, and metallic bonds) between atoms. Its core characteristics are "strong interaction forces (bond energies typically 100-1000 kJ / mol), stable bonding (not easily destroyed by environmental factors such as temperature and solvents), and controllable structure," which distinguishes it from the weak interactions of physical adsorption (such as van der Waals forces and hydrogen bonds).

[0091] Additive manufacturing, commonly known as "3D printing," is a new manufacturing technology that differs from traditional "subtractive manufacturing" (such as cutting and grinding) and "equal-material manufacturing" (such as casting and forging). Its core principle is "layer-by-layer material deposition." Through computer control, raw materials such as metals, plastics, and resins are stacked layer by layer according to preset three-dimensional model data in the order of "point-line-surface-volume" to ultimately form a solid part.

[0092] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments. It should be noted that in the following embodiments of this application, the direction from the wearer's line of sight towards the far end is defined as "forward," and the direction closer to the wearer's eyes is defined as "backward."

[0093] Example 1

[0094] Firstly, this invention proposes a photochromic multi-point defocus myopia control lens, see [link to relevant documentation]. Figure 1 and Figure 2 The lens includes:

[0095] The basic optical layer is used to form the main structure of the lens and provide basic refractive correction function;

[0096] A distributed defocus microstructure layer, comprising several microstructure units, wherein the radius of curvature of each microstructure unit is adapted to the wearer's personalized defocus needs;

[0097] A composite functional layer, comprising a photochromic functional layer and an optical compensation and control layer that are spatially completely overlapping and dynamically complementary in refractive index;

[0098] The basic optical layer, the distributed defocus microstructure layer, and the composite functional layer are arranged sequentially along the direction of the wearer's line of sight, or the basic optical layer, the composite functional layer, and the distributed defocus microstructure layer are arranged sequentially along the direction of the wearer's line of sight; and adjacent layers are connected by chemical bonding.

[0099] Specifically:

[0100] The basic optical layer is used to form the main structure of the lens and provide basic refractive correction function.

[0101] The material of the base optical layer is preferably a high-transmittance polyurethane acrylate resin, and its thickness is preferably 0.5 mm. The front surface of the base optical layer (referring to the surface at the front of the wearer's line of sight, the same below) is an aspherical design, and the rear surface (referring to the surface at the rear of the wearer's line of sight) is a flat surface or a spherical-cylindrical surface customized according to the wearer's individual needs.

[0102] In one embodiment, such as Figure 1 As shown, the distributed defocus microstructure layer is located on the front surface of the base optical layer and consists of tens of thousands of micron-level microstructure protrusion structural units. The radius of curvature of each structural unit is customized according to the wearer's personalized defocus needs, ranging from 50 microns to 500 microns.

[0103] Preferably, the microstructure unit is a raised structure unit, and the arrangement pattern adopts a non-uniform density distribution. The density of the microstructure in the central area is lower, and the density in the peripheral area gradually increases. The density gradient matches the retinal defocusing requirement gradient, ensuring that the defocusing amount increases linearly within the field of view from 0 degrees to 30 degrees, and the maximum defocusing amount is +0.5 diopters to +1.5 diopters.

[0104] A composite functional layer is used to ensure the optical stability of the photochromic effect. The composite functional layer includes a spatially overlapping photochromic functional layer and an optical compensation control layer, and the refractive indices of the photochromic functional layer and the optical compensation control layer are dynamically complementary.

[0105] The photochromic functional layer, located on the front surface of the distributed defocus microstructure layer, is composed of spiropyran-based organic molecules uniformly dispersed in a photocurable resin matrix. Its thickness is preferably 20 micrometers. This layer is responsible for sensing the intensity of ambient ultraviolet radiation and adjusting the lens's chromatic depth. The optical compensation and control layer is composed of a siloxane resin doped with nano-titanium dioxide particles. The nano-titanium dioxide particles have a particle size ranging from 10 to 50 nanometers and a mass fraction of 0.5% to 2%. These particles enhance ultraviolet absorption efficiency and improve the material's weather resistance. The nanoparticles are treated with a silane coupling agent to ensure uniform dispersion. The material properties of the optical compensation and control layer dynamically complement those of the photochromic functional layer, automatically offsetting refractive index changes during the photochromic process.

[0106] Furthermore, the optical compensation control layer and the photochromic functional layer are completely spatially overlapped, and the resin of the photochromic functional layer and the resin of the optical compensation control layer have the same main chain skeleton in chemical structure, ensuring that the two form chemical bonds at the interface rather than physical adhesion.

[0107] In another implementation, such as Figure 2 As shown, the basic optical layer, the composite functional layer, and the distributed defocus microstructure layer are arranged sequentially along the direction of the wearer's line of sight, that is, relative to... Figure 1 The implementation shown only requires swapping the distributed defocus microstructure layer and the composite functional layer, while keeping everything else unchanged.

[0108] In one embodiment, the optical compensation control layer adopts a gradient refractive index design, with its refractive index varying linearly in the thickness direction, ranging from 1.48 to 1.55. The refractive index gradient is achieved by controlling the component ratio of the sprayed resin.

[0109] In one embodiment, specifically as follows Figure 1 As shown, the aforementioned photochromic multi-point defocus myopia control lens also includes a surface protective layer. This surface protective layer is the outermost layer and is located on the front surface of the composite functional layer (according to...). Figure 2 In the illustrated embodiment, the surface protective layer is located on the front surface of the distributed defocus microstructure layer, i.e., at the very front of the entire lens. Its material is preferably fluorosilicone resin, and its thickness is preferably 5 micrometers, providing scratch resistance, stain resistance, and water resistance. The surface protective layer and the composite functional layer are also chemically bonded together.

[0110] In a preferred embodiment, the edge region of the aforementioned photochromic multi-point defocus myopia control lens is further provided with a functional transition zone, in which the concentration of photochromic material and the thickness of the compensation layer decrease radially to avoid the formation of obvious optical boundary effects at the lens edge.

[0111] In one embodiment, a micron-scale light-guiding fiber network is embedded in the basic optical layer. The fiber diameter is 5 to 20 microns and is distributed radially along the lens to guide a portion of the incident light to a light intensity sensor at the edge of the lens. This light intensity sensor is wirelessly connected to an external smart device to record data on the wearer's ambient lighting conditions.

[0112] In one embodiment, the rear surface of the lens (the rear surface of the base optical layer) is coated with an anti-reflective film layer, which is composed of five layers of oxide films with different refractive indices stacked alternately, with a center wavelength of 550 nanometers and a reflectivity of less than 0.5%.

[0113] It should be noted that the photochromic multi-point defocus myopia control lens disclosed in the above embodiments and preferred embodiments, through the synergistic effect of the above functional layers, undergoes a molecular configuration change in the photochromic functional layer under strong ultraviolet light, resulting in a darker lens color and an increase in its refractive index. At this time, the refractive index of the optical compensation control layer decreases due to a local temperature increase, and the two changes cancel each other out, keeping the defocus power set by the distributed defocus microstructure layer constant. Under low light conditions, the photochromic functional layer returns to a colorless state, the refractive index decreases, the temperature of the optical compensation control layer decreases, and the refractive index increases, allowing the photochromic multi-point defocus myopia control lens system to achieve optical balance again. Regardless of changes in ambient light, the defocus stimulation received by the wearer's retina remains stable, effectively inhibiting axial elongation while enjoying the improved visual comfort brought by photochromism.

[0114] The lens has a compact structure with a total thickness of less than 1.2 mm, which conforms to the modern trend of thinner and lighter eyeglasses. It is also molded in one piece, eliminating the problems of interfacial stress and thickness accumulation and the risk of interfacial peeling caused by traditional coating processes, and has excellent long-term stability and durability.

[0115] Example 2

[0116] Secondly, this invention also proposes a method for preparing a photochromic multi-point defocus myopia control lens, see [link to relevant documentation]. Figure 3 , Figure 4 The method includes:

[0117] S1. Obtain the wearer's ocular biometric data and personalized visual needs parameters;

[0118] S2. Based on ocular biometric data and personalized visual requirement parameters, construct a personalized optical model of the wearer's eyeball and calculate the distribution map of the defocus amount required by the wearer's retina under different field of view.

[0119] S3. Based on the defocus distribution map, obtain the spatial arrangement parameters and geometric morphology parameters of the distributed defocus microstructure layer including several microstructure units, and generate a three-dimensional geometric model file of all microstructure units based on the spatial arrangement parameters and geometric morphology parameters.

[0120] S4. Load the predetermined materials, including basic optical resin materials, photochromic functional materials, and optical compensation and control materials, into the independent material cavities of the multi-material inkjet additive manufacturing equipment.

[0121] S5. Start the additive manufacturing equipment and spray material layer by layer according to the preset molding logic and deposit and solidify it.

[0122] See below. Figure 1-9 The implementation process of an embodiment of the present invention will be described in detail below, in conjunction with the explanation of the specific steps S1-S5.

[0123] S1. Obtain the wearer's eye biometric data and personalized visual needs parameters.

[0124] Ocular biometric data includes corneal curvature, axial length, pupil diameter, and accommodative hysteresis. Personalized visual needs parameters include data such as the distribution of daily eye use scenarios, sensitivity to glare, and preference for lens color change speed.

[0125] In a preferred embodiment, the wearer's ocular biometric data is acquired using a non-contact biometric device. The non-contact biometric device emits a low-coherence beam to scan the anterior segment of the eye, reconstructing the anterior and posterior corneal curvature, anterior chamber depth, lens thickness, and total axial length through interference signals. Pupil diameter data is obtained by capturing the pupil's edge contour under standard illumination using an infrared imaging system and calculating its equivalent circle diameter. Accommodation hysteresis is measured using dynamic retinoscopy, where the wearer is required to fixate on targets at different distances, and the hysteresis difference between their accommodative response curve and the ideal accommodative curve is recorded. Personalized visual needs parameters are collected through a standardized questionnaire. The questionnaire covers the wearer's daily time spent in scenarios such as indoor office work, outdoor activities, and nighttime driving, their subjective discomfort rating for glare under strong light, and their expected time required for the lens to transition from a transparent to a dark state.

[0126] All the collected data is stored in a structured format in a central database for use in subsequent optical model construction. It should be noted that the acquisition of the wearer's ocular biometric data and personalized visual requirement parameters ensures that the lens design is based entirely on the wearer's physiological characteristics and subjective preferences, laying the foundation for precise, personalized myopia control.

[0127] S2. Based on ocular biometric data and personalized visual requirement parameters, construct a personalized optical model of the wearer's eyeball and calculate the distribution map of the defocus amount required by the wearer's retina under different field of view angles.

[0128] Based on ocular biometric data and combined with personalized visual requirement parameters, a personalized optical model for the wearer's eyeball is constructed, and the distribution map of the required defocus amount of the retina under different field of view is calculated.

[0129] In a preferred embodiment, a ray tracing algorithm is used to construct a personalized optical model, simplifying the eyeball into a multi-layered optical system composed of the cornea, aqueous humor, lens, and vitreous humor. The refractive index and thickness of each layer are directly assigned from ocular biometric data. See also Figure 5 The personalized optical model takes the incident direction of parallel incident rays at different field of view angles as input and outputs the focused position of the rays on the retinal plane. By comparing the positional difference between the focused position and the ideal retinal plane, the required defocus amount at that field of view angle is calculated. The calculation process covers a range from 0 degrees in the central field of view to 40 degrees in the peripheral field of view, generating defocus amount data points at 5-degree intervals.

[0130] In a further preferred embodiment, for wearers with a large amount of accommodation lag, the personalized optical model introduces an additional negative defocus offset during calculation to compensate for hyperopic defocus caused by insufficient accommodation ability.

[0131] The resulting defocus distribution map is a two-dimensional matrix, where row indices correspond to the horizontal field of view, column indices correspond to the vertical field of view, and matrix elements represent the required defocus amount at that field of view, in diopters. This defocus distribution map serves as the direct basis for the design of the distributed defocus microstructure layer, ensuring that the lens provides physiologically appropriate defocus stimulation in any viewing direction.

[0132] S3. Based on the defocus distribution map, obtain the spatial arrangement parameters and geometric morphology parameters of the distributed defocus microstructure layer including several microstructure units, and generate a three-dimensional geometric model file of all microstructure units based on the spatial arrangement parameters and geometric morphology parameters.

[0133] Based on the defocus distribution map, the spatial arrangement parameters and geometric morphology parameters of the distributed defocus microstructure layer are designed. The spatial arrangement parameters include the latitude and longitude coordinates of the center point of the microstructure unit on the lens surface, and the geometric morphology parameters include the radius of curvature, sag, and edge transition slope of each microstructure unit.

[0134] The distributed defocus microstructure layer consists of tens of thousands of micrometer-scale protrusions or depressions, each of which introduces a small additional optical power in a local area. The design principle of the spatial arrangement parameters is to match the density distribution of the microstructure units with the spatial gradient of the defocus distribution pattern. In areas where the defocus changes drastically, such as the nasal peripheral field of vision, the microstructure units are densely arranged, while in areas where the defocus changes gradually, such as the temporal field of vision, the microstructure units are sparsely arranged.

[0135] In a preferred embodiment, see Figure 5 Based on the defocus distribution map, the spatial arrangement and geometric parameters of the distributed defocus microstructure layer are designed as follows: the front surface of the lens is divided into several hexagonal grid regions. The coordinates of the center point of each grid region are defined by the latitude and longitude system, with longitude ranging from -30 degrees to +30 degrees and latitude ranging from -20 degrees to +20 degrees. One microstructure unit is arranged within each grid region, and its location is the grid center point. The design of the geometric parameters is based on the thin lens formula, converting the required defocus amount into the local curvature of the microstructure unit. For example, for a convex microstructure, the relationship between its radius of curvature R and the defocus amount D is determined by the following formula:

[0136] D = (n - 1) / R

[0137] Where n is the refractive index of the basic optical resin material, preferably 1.52. According to this formula, the greater the defocusing amount, the smaller the required radius of curvature, meaning the steeper the microstructure protrusions.

[0138] Furthermore, the sagitta parameter is jointly determined by the radius of curvature and the base diameter of the microstructure unit, ensuring a smooth transition between the microstructure edge and the lens substrate to avoid scattering spots. The edge transition slope is preferably limited to between 0.5 and 2 to ensure visual comfort. All design parameters for the microstructure units are stored in a 3D geometric model file for subsequent manufacturing equipment to read and execute, specifically as follows... Figure 5 As shown.

[0139] S4. Load the predetermined materials, including basic optical resin materials, photochromic functional materials, and optical compensation and control materials, into the independent material cavities of the multi-material inkjet additive manufacturing equipment.

[0140] S41. Select basic optical resin materials, photochromic functional materials, and optical compensation and control materials.

[0141] The basic optical resin material is used to deposit the basic optical layer and the distributed defocusing microstructure layer. The photochromic functional material is used to deposit the photochromic functional layer, and the optical compensation and control material is used to deposit the optical compensation and control layer. The photochromic functional material undergoes a molecular configuration change under ultraviolet irradiation, leading to a change in its absorption spectrum. The optical compensation and control material exhibits opposite trends in its optical parameters, namely temperature coefficient and refractive index, compared to the photochromic functional material.

[0142] In a preferred embodiment, the base optical resin material is a high-transmittance, low-dispersion polyurethane acrylate prepolymer with an Abbe number greater than 40, ensuring excellent imaging clarity of the lens substrate. The photochromic functional material undergoes a molecular configuration change under ultraviolet irradiation, leading to a change in its absorption spectrum. Preferably, the photochromic functional material is a spiropyran-based organic molecule whose molecular structure changes from a closed-ring colorless state to an open-ring colored state after absorbing ultraviolet light. This is accompanied by an increase in molecular dipole moment and a change in electron cloud distribution, resulting in an increase in the material's refractive index of 0.005~0.01. The optical compensation and control material exhibits an opposite trend in optical parameters—temperature coefficient and refractive index—to that of the photochromic functional material. Preferably, the optical compensation and control material is a siloxane resin doped with nano-titanium dioxide particles. This material has a negative temperature coefficient, and its refractive index decreases with increasing temperature, with a change rate of -0.0001 / degree Celsius. During photochromism, the minute amount of heat released by the configurational change of spiropyran molecules raises the local temperature by 2-5 degrees Celsius, triggering a decrease in the refractive index of the optical compensation control material. This precisely counteracts the effect of the increase in the refractive index of the photochromic material. For details, please refer to... Figure 6 .

[0143] The three materials—basic optical resin material, photochromic functional material, and optical compensation and control material—all contain photocurable acrylate groups in their chemical structure. This ensures that they can copolymerize with the basic resin under ultraviolet light irradiation, forming a strong chemical bond and preventing delamination or migration during long-term use.

[0144] S42. The basic optical resin material, photochromic functional material, and optical compensation and control material are respectively loaded into the independent material cavities of the multi-material inkjet additive manufacturing equipment, wherein the additive manufacturing equipment is also equipped with a high-precision piezoelectric printhead array and an ultraviolet curing module.

[0145] Specifically, the additive manufacturing equipment is equipped with twelve piezoelectric printhead arrays, each corresponding to a different material formulation. The printhead orifice diameter is 20 micrometers, and the minimum droplet volume is 5 picoliters. The UV curing module consists of an LED array with a wavelength of 365 nanometers, installed 5 millimeters behind the printhead to ensure initial curing of the droplet within 0.1 seconds of contact with the substrate. The additive manufacturing equipment's work platform is a high-precision three-axis motion system with a positioning accuracy of 0.5 micrometers and a repeatability of 0.1 micrometers.

[0146] In a preferred embodiment, each material cavity is equipped with a constant temperature control system to stabilize the temperature of the material to be sprayed (in this embodiment, the basic optical resin material, photochromic functional material, and optical compensation control material) at 25±0.5 degrees Celsius, so as to maintain the constant viscosity of the material to be sprayed and ensure spraying stability.

[0147] Furthermore, all of the above materials undergo vacuum degassing before loading to eliminate internal air bubbles and prevent ink breaks or satellite droplets from forming during the spraying process.

[0148] S5. Start the additive manufacturing equipment and spray material layer by layer according to the preset molding logic and deposit and solidify it.

[0149] The additive manufacturing equipment is activated, and materials are deposited and cured layer by layer according to a pre-set four-stage forming logic. These four stages include: the basic optical layer forming stage, the distributed defocus microstructure layer forming stage, the photochromic functional layer and optical compensation control layer co-forming stage, and the surface protective layer forming stage. For details, please refer to [link to relevant documentation]. Figure 7 .

[0150] In one implementation, the above four stages are performed in the following order:

[0151] The first stage is the formation of the basic optical layer. The nozzle array sprays only the basic optical resin material and deposits it line by line according to the aspherical curvature corresponding to the lens power to be manufactured. Each layer is 10 micrometers thick, and a total of 50 layers are deposited to form an optical substrate with a thickness of 0.5 millimeters.

[0152] The second stage involves the formation of distributed defocused microstructure layers. The additive manufacturing equipment reads the three-dimensional geometric model file generated in step S3 and controls the nozzle to spray the base optical resin material at specified grid coordinates, forming raised or recessed structures. For raised structures, a layer-by-layer stacking method is used, building from the substrate upwards; for recessed structures, a negative space filling strategy is used, first depositing material in the surrounding area and finally removing the material in the central area.

[0153] The third stage involves the co-forming of the photochromic functional layer and the optical compensation and control layer. This stage employs a dual-material synchronous spraying mode, where the photochromic functional material and the optical compensation and control material are sprayed simultaneously through adjacent nozzles at a 1:1 volume ratio, forming a uniformly mixed composite functional layer on the lens surface. Preferably, the thickness of the composite functional layer is 20 micrometers.

[0154] In some embodiments, in order to improve lens durability, a surface protective layer needs to be provided on the front surface of the lens, so the molding logic also includes: a fourth stage.

[0155] The fourth stage involves the formation of a surface protective layer, which involves spraying high-hardness, scratch-resistant fluorosilicone resin material to form a 5-micron-thick transparent protective film, thereby improving the durability of the lens.

[0156] In another implementation, the order of the second and third stages is reversed, that is, the first stage is the formation of the basic optical layer, the second stage is the co-formation of the photochromic functional layer and the optical compensation control layer, the third stage is the formation of the distributed defocus microstructure layer, and the fourth stage is the formation of the surface protective layer.

[0157] The entire manufacturing process is carried out in a nitrogen-protected atmosphere to prevent material oxidation.

[0158] In a more preferred embodiment, the method for preparing a photochromic multi-point defocus myopia control lens, in addition to including the above-described embodiments and preferred embodiments, further includes:

[0159] S6. During the deposition and curing process of each layer of material, the three-dimensional morphology data of the current layer surface is scanned in real time and compared with the preset theoretical morphology data. If the deviation exceeds the preset threshold, a correction command is executed.

[0160] During the deposition and curing of each layer of material, the laser confocal microscopy module integrated inside the device is activated to scan the three-dimensional morphology data of the current layer surface in real time and compare it with the preset theoretical morphology data. If the deviation exceeds the preset threshold, a correction command is sent to the printhead drive system to adjust the droplet volume and landing point coordinates of the next jet cycle.

[0161] In one embodiment, the nozzle of the additive manufacturing equipment is equipped with a real-time morphology monitoring module. This module uses confocal laser scanning to immediately acquire surface three-dimensional morphology data after each layer of material is deposited and compares it with a preset model. If the deviation exceeds ±0.5 micrometers, a closed-loop feedback mechanism is activated to adjust the spraying parameters of subsequent layers or to perform local material supplementation spraying.

[0162] Preferably, the real-time morphology monitoring module is a laser confocal microscopy imaging module. The laser confocal microscopy imaging module emits a laser beam with a wavelength of 405 nanometers, performs a grid scan of the current layer surface through a galvanometer system, receives reflected light signals, and reconstructs three-dimensional point cloud data. The reconstructed point cloud data is compared point-by-point with preset theoretical morphology data (i.e., the theoretical morphology data of the personalized lens adapted to the wearer, calculated and constructed step-by-step based on the wearer's ocular biometric data and personalized visual requirement parameters, as described in the above steps), and the root mean square error is calculated. If the root mean square error is greater than 0.5 micrometers, it is determined that the morphology deviation exceeds the standard, and the system automatically generates a correction command. The correction command includes an ink droplet volume adjustment coefficient and a landing point coordinate offset, which is sent to the printhead drive controller. In the next ejection cycle, the controller adjusts the driving voltage of the piezoelectric crystal according to the command to change the ink droplet ejection volume, or fine-tunes the position of the printhead in the X and Y directions to correct the landing point deviation. This closed-loop feedback mechanism ensures that the geometric accuracy of the distributed defocus microstructure is always controlled within the tolerance range allowed by the optical design, avoiding inaccuracies in defocusing due to manufacturing errors. For details, please refer to [link to relevant documentation]. Figure 8 .

[0163] In a further preferred embodiment, the method for preparing a photochromic multi-point defocus myopia control lens, based on the above embodiments and preferred embodiments, further includes:

[0164] S7. After the manufacturing of all the layers is completed, the lens as a whole is optimized. The optimization includes heat treatment and stress relief, fine grinding and polishing of the lens edges.

[0165] After the manufacturing of all the layers is completed, the lens is subjected to heat treatment and stress relief processes, followed by edge grinding and polishing to obtain the final finished lens.

[0166] The lenses are placed in a temperature-controlled oven and heated to 80 degrees Celsius at a rate of 1 degree Celsius per minute, held at that temperature for two hours to fully relax residual stress within the material. They are then slowly cooled to room temperature at a rate of 0.5 degrees Celsius per minute. Alternatively, when the entire lens undergoes annealing, the treatment temperature is 70 degrees Celsius for four hours to eliminate residual stress and stabilize material properties. After heat treatment, the lenses are transferred to a CNC edging machine for edge cutting according to the frame shape, with a cutting precision of 0.01 mm. Finally, a diamond polishing wheel is used to polish the lens edges, eliminating cutting burrs and improving wearing comfort.

[0167] Finished lenses undergo optical performance testing, including central optical power, astigmatism, prism power, light transmittance, and color change response time. Only lenses that pass all tests can leave the factory.

[0168] This completes the entire process of fabricating a photochromic multi-point defocus myopia control lens according to this embodiment. The lens fabricated according to this embodiment, through the synergistic effect of a precisely designed optical compensation control layer and a photochromic functional layer, dynamically compensates for the optical parameter drift caused by the color depth change of the photochromic material. This ensures that the defocus amount and focal position set by the multi-point defocus structure remain stable, solving the problems of defocus structure failure, unstable optical performance, and heavy structure caused by refractive index fluctuations in traditional photochromic lenses during the color-changing process. Figure 9 As shown.

[0169] Example 3

[0170] Thirdly, the present invention also provides a system for fabricating photochromic multi-point defocus myopia control lenses, the system comprising:

[0171] The data acquisition module is configured to acquire the wearer's ocular biometric data and personalized visual needs parameters;

[0172] The defocus distribution map acquisition module is configured to construct a personalized optical model of the wearer's eyeball based on ocular biometric data and personalized visual requirement parameters, and calculate the defocus distribution map required by the wearer's retina under different field of view angles;

[0173] The distributed defocus microstructure model acquisition module is configured to acquire the spatial arrangement parameters and geometric morphology parameters of the distributed defocus microstructure layer including several microstructure units based on the defocus amount distribution map, and generate a three-dimensional geometric model file of all microstructure units based on the spatial arrangement parameters and geometric morphology parameters.

[0174] The lens manufacturing control module is configured to, after loading predetermined materials, including basic optical resin materials, photochromic functional materials, and optical compensation and control materials, into the independent material cavities of the multi-material inkjet additive manufacturing equipment, start the additive manufacturing equipment, spray materials layer by layer according to the preset molding logic, and deposit and solidify them. The molding logic includes: a second stage, calling a three-dimensional geometric model file to deposit and form a distributed defocus microstructure layer.

[0175] It is understood that the photochromic multi-point defocus myopia control lens preparation system provided in this embodiment of the invention corresponds to the above-mentioned photochromic multi-point defocus myopia control lens preparation method. The explanation, examples, and beneficial effects of the relevant content can be referred to the corresponding content in the photochromic multi-point defocus myopia control lens preparation method, and will not be repeated here.

[0176] Example 4

[0177] Fourthly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps of the method for preparing a photochromic multi-point defocus myopia control lens as described in any of the above embodiments and their preferred embodiments. The method mainly includes:

[0178] S1. Obtain the wearer's ocular biometric data and personalized visual needs parameters;

[0179] S2. Based on ocular biometric data and personalized visual requirement parameters, construct a personalized optical model of the wearer's eyeball and calculate the distribution map of the defocus amount required by the wearer's retina under different field of view.

[0180] S3. Based on the defocus distribution map, obtain the spatial arrangement parameters and geometric morphology parameters of the distributed defocus microstructure layer including several microstructure units, and generate a three-dimensional geometric model file of all microstructure units based on the spatial arrangement parameters and geometric morphology parameters.

[0181] S4. Load the predetermined materials, including basic optical resin materials, photochromic functional materials, and optical compensation and control materials, into the independent material cavities of the multi-material inkjet additive manufacturing equipment.

[0182] S5. Start the additive manufacturing equipment and spray material layer by layer according to the preset molding logic and deposit and solidify it.

[0183] It is understood that the electronic device for preparing photochromic multi-point defocus myopia control lenses provided in this embodiment of the invention corresponds to the above-mentioned method and system for preparing photochromic multi-point defocus myopia control lenses. The explanations, examples, and beneficial effects of the relevant content can be referred to the corresponding content in the method and system for preparing photochromic multi-point defocus myopia control lenses, and will not be repeated here.

[0184] Example 5

[0185] Fifthly, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the method for preparing a photochromic multi-point defocus myopia control lens as described in any of the above embodiments and their preferred embodiments, the method comprising:

[0186] S1. Obtain the wearer's ocular biometric data and personalized visual needs parameters;

[0187] S2. Based on ocular biometric data and personalized visual requirement parameters, construct a personalized optical model of the wearer's eyeball and calculate the distribution map of the defocus amount required by the wearer's retina under different field of view.

[0188] S3. Based on the defocus distribution map, obtain the spatial arrangement parameters and geometric morphology parameters of the distributed defocus microstructure layer including several microstructure units, and generate a three-dimensional geometric model file of all microstructure units based on the spatial arrangement parameters and geometric morphology parameters.

[0189] S4. Load the predetermined materials, including basic optical resin materials, photochromic functional materials, and optical compensation and control materials, into the independent material cavities of the multi-material inkjet additive manufacturing equipment.

[0190] S5. Start the additive manufacturing equipment and spray material layer by layer according to the preset molding logic and deposit and solidify it.

[0191] It is understood that the storage medium for the preparation of photochromic multi-point defocus myopia control lenses provided in this embodiment of the invention corresponds to the preparation method and system of photochromic multi-point defocus myopia control lenses described above. The explanations, examples, and beneficial effects of the relevant content can be referred to the corresponding content in the preparation method and system of photochromic multi-point defocus myopia control lenses, and will not be repeated here.

[0192] In summary, compared with existing technologies, it has the following beneficial effects:

[0193] 1. This application proposes a photochromic multi-point defocus myopia control lens, comprising a basic optical layer for constituting the main structure of the lens and providing basic refractive correction function; a distributed defocus microstructure layer, wherein the distributed defocus microstructure layer includes several microstructure units, the radius of curvature of each microstructure unit being adapted to the wearer's personalized defocus needs; and a composite functional layer, wherein the composite functional layer includes a photochromic functional layer and an optical compensation adjustment layer that are spatially completely overlapping and dynamically complementary in refractive index; the basic optical layer, the distributed defocus microstructure layer, and the composite functional layer are arranged sequentially along the direction of the wearer's line of sight, or the basic optical layer, the composite functional layer, and the distributed defocus microstructure layer are arranged sequentially along the direction of the wearer's line of sight; and adjacent layers are connected by chemical bonding. This lens, through the synergistic effect of a precisely designed optical compensation control layer and a photochromic functional layer, dynamically compensates for the optical parameter drift caused by the color depth change of the photochromic material. This ensures that the defocus amount and focal position set by the multi-point defocus structure remain stable, solving the problems of defocus structure failure, unstable optical performance, and heavy structure caused by refractive index fluctuations in traditional photochromic lenses during the color-changing process.

[0194] 2. This application proposes a method for fabricating photochromic multi-point defocus myopia control lenses. It employs a multi-material inkjet additive manufacturing process to achieve precise layer-by-layer stacking and in-situ molding of functional layers, avoiding the thickness increase and interface stress problems associated with traditional coating processes. The entire manufacturing process incorporates real-time morphology monitoring and a closed-loop feedback control mechanism to ensure that the geometric accuracy and material distribution of each layer meet optical design requirements. The resulting lenses provide consistent myopia control performance and clear visual experience in both strong and low light environments.

[0195] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0196] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A photochromic multi-point defocus myopia control lens, characterized in that, The lens includes: The basic optical layer is used to form the main structure of the lens and provide basic refractive correction function; A distributed defocus microstructure layer, comprising several microstructure units, wherein the radius of curvature of each microstructure unit is adapted to the wearer's personalized defocus needs; The composite functional layer includes a photochromic functional layer and an optical compensation and control layer that are spatially completely overlapping and have dynamically complementary refractive indices. The optical compensation and control layer has negative dispersion characteristics, which dynamically cancels the focus drift caused by color change. Moreover, the optical compensation and control material of the optical compensation and control layer has the opposite trend of optical parameter temperature coefficient and refractive index change to the photochromic functional material of the photochromic functional layer, which can automatically cancel the trend of refractive index change during the photochromic process. The basic optical layer, the distributed defocus microstructure layer, and the composite functional layer are arranged sequentially along the direction of the wearer's line of sight, or the basic optical layer, the composite functional layer, and the distributed defocus microstructure layer are arranged sequentially along the direction of the wearer's line of sight; and adjacent layers are connected by chemical bonds formed by photocuring reaction.

2. The lens as described in claim 1, characterized in that, The lens also includes: A surface protective layer is chemically bonded to the front surface of the composite functional layer or the distributed defocus microstructure layer, wherein the front surface refers to the surface at the front of the wearer's line of sight; and / or A functional transition region is provided at the edge of the lens, wherein the concentration of the photochromic material in the functional transition region decreases radially relative to the thickness of the optical compensation control layer; and / or An anti-reflective coating is disposed on the rear surface of the base optical layer, wherein the rear surface refers to the surface at the rear end in the direction of the wearer's line of sight.

3. The lens as described in claim 1, characterized in that, The basic optical layer is made of polyurethane acrylate resin; the photochromic functional layer is composed of spiropyran organic molecules uniformly dispersed in a photocurable resin matrix; and the optical compensation and control layer is composed of siloxane resin doped with nano-titanium dioxide particles.

4. A method for preparing a photochromic multi-point defocus myopia control lens as described in any one of claims 1-3, characterized in that, The method includes: Acquire the wearer's ocular biometric data and personalized visual needs parameters; Based on ocular biometric data and personalized visual requirement parameters, a personalized optical model of the wearer's eyeball is constructed, and the distribution map of the defocus amount required by the wearer's retina under different field of view is calculated. Based on the defocus distribution map, the spatial arrangement parameters and geometric morphology parameters of the distributed defocus microstructure layer including several microstructure units are obtained, and a three-dimensional geometric model file of all microstructure units is generated based on the spatial arrangement parameters and geometric morphology parameters. The predetermined materials, including basic optical resin materials, photochromic functional materials, and optical compensation and control materials, are loaded into the independent material cavities of the multi-material inkjet additive manufacturing equipment. Start the additive manufacturing equipment, spray material layer by layer according to the preset molding logic, and deposit and solidify it. Based on the defocus distribution map, the spatial arrangement parameters and geometric parameters of the distributed defocus microstructure layer are designed as follows: the front surface of the lens is divided into several hexagonal grid regions, and the coordinates of the center point of each grid region are defined by the latitude and longitude system; a microstructure unit is arranged in each grid region, and its position is the center point of the grid; the design of the geometric parameters is based on the thin lens formula, and the required defocus amount is converted into the local curvature of the microstructure unit.

5. The method as described in claim 4, characterized in that, The personalized optical model is constructed using a ray tracing algorithm. The input of the personalized optical model is the incident direction of parallel incident rays at different field of view angles, and the output is the focusing position of the rays on the retinal plane.

6. The method as described in claim 5, characterized in that, For wearers whose adjustment hysteresis is greater than a preset value, the personalized optical model introduces a negative defocus offset when calculating the defocus amount to compensate for hyperopic defocus.

7. The method as described in claim 4, characterized in that, The three materials mentioned above—basic optical resin material, photochromic functional material, and optical compensation and control material—all contain photocurable acrylate groups in their chemical structures.

8. The method as described in claim 4, characterized in that, The additive manufacturing equipment is equipped with a high-precision piezoelectric nozzle array and an ultraviolet curing module; each material cavity is equipped with a constant temperature control system.

9. The method as described in claim 7, characterized in that, Before loading the materials, the basic optical resin material, photochromic functional material, and optical compensation and control material are all subjected to vacuum degassing treatment.

10. The method as described in claim 4, characterized in that, The forming logic includes: In the first stage, the basic optical resin material is sprayed and deposited to form the basic optical layer; In the second stage, a distributed defocused microstructure layer is deposited by calling the three-dimensional geometric model file. In the third stage, the photochromic functional material and the optical compensation and control material are mixed and sprayed simultaneously and in the same proportion, and deposited to form a composite functional layer of photochromic functional layer and optical compensation and control layer. In the fourth stage, fluorosilicone resin material is sprayed and deposited to form a surface protective layer; Alternatively, the forming logic includes: In the first stage, the basic optical resin material is sprayed and deposited to form the basic optical layer; In the second stage, the photochromic functional material and the optical compensation and control material are mixed and sprayed simultaneously and in the same proportion, and deposited to form a composite functional layer of photochromic functional layer and optical compensation and control layer. In the third stage, a distributed defocused microstructure layer is formed by depositing a three-dimensional geometric model file. In the fourth stage, fluorosilicone resin material is sprayed and deposited to form a surface protective layer.

11. The method as described in claim 4, characterized in that, The method further includes: during the deposition and curing process of each layer of material, scanning the three-dimensional morphology data of the current layer surface in real time and comparing it with the preset theoretical morphology data; if the deviation exceeds the preset threshold, executing a correction command.

12. The method as described in claim 11, characterized in that, A laser beam is emitted using a laser confocal microscopy imaging module. The surface of the current layer is then scanned by a galvanometer system. The reflected light signal is received and three-dimensional point cloud data is reconstructed to obtain the three-dimensional topography data of the current layer surface.

13. The method as described in claim 4, characterized in that, The method further includes: after the manufacturing of all the layers, optimizing the lens as a whole, including heat treatment and stress relief, fine grinding and polishing of the lens edges.

14. A system for performing the method for preparing a photochromic multi-point defocus myopia control lens as described in any one of claims 4-13, characterized in that, The system includes: The data acquisition module is configured to acquire the wearer's ocular biometric data and personalized visual needs parameters; The defocus distribution map acquisition module is configured to construct a personalized optical model of the wearer's eyeball based on ocular biometric data and personalized visual requirement parameters, and calculate the defocus distribution map required by the wearer's retina under different field of view angles; The distributed defocus microstructure model acquisition module is configured to acquire the spatial arrangement parameters and geometric morphology parameters of a distributed defocus microstructure layer including several microstructure units based on the defocus distribution map, and generate a three-dimensional geometric model file of all microstructure units based on the spatial arrangement parameters and geometric morphology parameters; when designing the spatial arrangement parameters and geometric morphology parameters of the distributed defocus microstructure layer based on the defocus distribution map, the module includes: dividing the front surface of the lens into several hexagonal grid regions, the coordinates of the center point of each grid region being defined by a latitude and longitude system; arranging one microstructure unit in each grid region, the position of which is the center point of the grid; and designing the geometric morphology parameters based on the thin lens formula, converting the required defocus amount into the local curvature of the microstructure unit; The lens manufacturing control module is configured to, after loading predetermined materials, including basic optical resin materials, photochromic functional materials, and optical compensation and control materials, into the independent material cavities of the multi-material inkjet additive manufacturing equipment, start the additive manufacturing equipment, spray materials layer by layer according to the preset molding logic, and deposit and solidify them. The molding logic includes: a second stage, calling a three-dimensional geometric model file to deposit and form a distributed defocus microstructure layer.

15. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method for preparing the photochromic multi-point defocus myopia control lens as described in any one of claims 4-13.

16. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the method for preparing the photochromic multi-point defocus myopia control lens as described in any one of claims 4-13.

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