Myopic control defocus lens based on maxwellian window microlens array

Abstract

The application discloses a myopia prevention and control defocus lens based on a Maxwell window microlens array, and relates to the technical field of eye vision, which comprises a lens base body, a central optical area and a functional area arranged around the central optical area are arranged on the lens base body, and a microlens array is arranged in the functional area; the array at least comprises a first microlens assembly and a second microlens assembly; the first microlens assembly has a first refractive power and is used for focusing light on the front of a retina to form a myopia defocus signal; the second microlens assembly has a second refractive power and is used for focusing light on the vicinity of a posterior nodal point of the human eye, triggering a Maxwell window illumination effect, and forming a uniform light curtain on the retina to reduce imaging contrast. The two assemblies are realized in a composite multi-arc segment structure or a mixed independent array form to realize microscopic fusion. The application realizes double synergistic intervention of the defocus signal and contrast regulation, and breaks through the bottleneck of poor controllability, serious light halo and lens fogging of the traditional scattering technology.

Description

Technical Field

[0001] This invention relates to the field of optometry technology, and in particular to a myopia control defocus lens based on a Maxwell window microlens array. Background Technology

[0002] Myopia has become a prevalent visual health problem worldwide, especially among adolescents. Currently, mainstream optical myopia control methods are primarily based on the following two widely validated biological theories:

[0003] 1. Myopic Defocus Theory: This theory posits that when light focuses behind the retina (hyperopic defocus), it stimulates compensatory elongation of the axial length, while when light focuses in front of the retina (myopic defocus), it inhibits excessive axial elongation. Based on this principle, microlens arrays are placed in the peripheral region of the lens to focus some light in front of the retina, generating a defocus signal that inhibits axial growth. Representative technologies include DIMS (Multi-point Myopic Defocus Microlenses) and HAL (Hyper-aspheric Microlenses). However, these approaches primarily rely on differences in sharpness signals to generate the defocus effect, without specifically regulating the contrast signal of the retinal image, resulting in a relatively simple mechanism of action.

[0004] 2. Contrast Theory: Recent studies have shown that high-contrast visual signals (such as sharp black and white edges and high-contrast patterns) may promote axial growth by stimulating the retinal dopamine system or other neural pathways, while reducing retinal imaging contrast can significantly slow the progression of myopia. Based on this theory, existing technologies attempt to reduce contrast through light scattering. Representative products include DOT (Diffusion Optical Technology) lenses, which form a micron-scale scattering array on the lens surface, causing disordered light diffusion to reduce image sharpness and contrast.

[0005] Although both of the above technologies have achieved myopia control to some extent, they each have the following inherent drawbacks: (1) Limitations of defocus lenses: Existing defocus microlenses only provide positive power of +3.50D to +4.50D. Their design goal is limited to focusing light in front of the retina to form a defocus spot, without actively regulating the retinal contrast signal. Although these lenses can generate a defocus signal that inhibits axial growth, they cannot quantify or precisely control the degree of contrast attenuation of the retinal image, and their control effect on people with high contrast sensitivity is limited.

[0006] (2) Defects of scattering lenses: Contrast reduction technology, represented by DOT, mainly relies on the disordered scattering of incident light by microstructures, and its physical process is inherently random. This technology has the following prominent problems: ① The distribution of scattered light is uncontrollable, which can easily form an excessively large circle of confusion or a significant halo, affecting nighttime visual quality and sports safety; ② The degree of contrast attenuation is difficult to quantify precisely, and it is impossible to make parameterized adjustments according to individual differences; ③ The lenses have a noticeable cloud-like or frosted appearance, resulting in decreased optical transmittance and poor aesthetics, which can easily lead to psychological rejection for teenagers who are concerned about appearance; ④ The scattering structure is essentially "light reduction" rather than "light addition", which carries the risk of decreased central visual acuity while reducing contrast.

[0007] (3) Lack of genuine mechanism synergy: In current technical solutions, defocusing and contrast control functions are often implemented by completely independent, spatially separated optical structures, or even belong to different product types. There is no integrated design scheme that simultaneously achieves "precise and controllable contrast control" and "effective myopia defocus signal" within a single micro optical unit. The defocus signal and contrast signal are spatially misaligned or temporally competing on the retina, making it difficult to form a synergistic intervention effect.

[0008] (4) Optical efficiency and appearance of microlens arrays cannot be achieved simultaneously: In traditional microlens arrays, the gap area between lenses is usually a flat or ineffective optical area, which cannot generate defocus signals or contribute to contrast control, forming an optical "dead zone". If the gap is reduced to improve the fill rate, the lens density or size needs to be increased, which can easily lead to obvious visible microstructures on the lens surface, affecting light transmittance and aesthetics.

[0009] In summary, how to simultaneously achieve the dual mechanisms of "quantifiable retinal contrast regulation" and "stable myopia defocus signal" on the same lens while ensuring high lens transparency, good appearance, and clear central vision, and how to achieve deep integration and optical synergy of the two functions at the microstructural level, is a technical challenge that urgently needs to be solved in this field. Summary of the Invention

[0010] To address these issues, this invention provides a myopia control defocus lens based on a Maxwell window microlens array. This lens solves the problems in existing technologies, such as the difficulty in simultaneously achieving precise and quantifiable retinal contrast regulation and stable myopia defocus signal intervention within a single lens microstructure, as well as the technical problems of scattering lenses, including severe halos, decreased central vision, lens fogging, and low optical efficiency.

[0011] To address the aforementioned technical problems, this invention provides a myopia control defocus lens based on a Maxwell window microlens array, comprising a lens substrate, wherein the lens substrate has a central optical zone and functional zones arranged around the central optical zone, and the functional zones are provided with a micro-optical unit array. The micro-optical unit array includes at least a first microlens assembly and a second microlens assembly; The first microlens assembly has a first diopter, which is configured to focus incident light in front of the retina to form a myopic defocus signal; The second microlens assembly has a second diopter, which is configured to focus incident light near the posterior node of the human eye, triggering the Maxwell window illumination effect to form a uniform light curtain on the retina to reduce image contrast. The first refractive power is different from the second refractive power, and the second refractive power is greater than the first refractive power.

[0012] Preferably, the second refractive power range is +42.00D to +62.00D, more preferably +52.00D; the first refractive power range is +3.50D to +4.50D.

[0013] Preferably, at least a portion of the micro-optical units in the micro-optical unit array are composite multi-arc microlens structures, wherein the composite multi-arc microlens structure simultaneously includes the first microlens component and the second microlens component within the same microlens unit.

[0014] Preferably, the composite multi-arc segment microlens structure is a coaxial multi-ring structure: The microlens unit is circular in shape, with its central region constituting the second microlens assembly and the annular region surrounding the central region constituting the first microlens assembly. Preferably, the overall diameter of the microlens unit is 0.8 mm to 1.5 mm, more preferably 1.1 mm; Preferably, the diameter of the central region is 0.5 mm to 0.9 mm, more preferably 0.7 mm; Preferably, the width of the annular region is 0.15 mm to 0.35 mm, more preferably 0.2 mm.

[0015] Preferably, the composite multi-segment microlens structure is a non-coaxial composite structure: The microlens unit includes a first microlens assembly as a substrate, and a second microlens assembly formed by superimposing or embedding in a local area on the surface of the first microlens assembly. Preferably, the diameter of the first microlens assembly is 0.8 mm to 1.5 mm, more preferably 1.1 mm; Preferably, the diameter of the second microlens assembly is 0.3 mm to 0.8 mm, more preferably 0.5 mm; Preferably, the second microlens assembly is disposed at or off the geometric vertex of the first microlens assembly.

[0016] Preferably, the micro-optical unit array is a hybrid independent microlens array, wherein: The first microlens assembly and the second microlens assembly are respectively disposed in a first type of microlens unit and a second type of microlens unit that are independent of each other; The first type of microlens unit has the first diopter, and the second type of microlens unit has the second diopter; The first type of microlens unit and the second type of microlens unit are arranged in a mixed manner in the functional area.

[0017] Preferably, the mixed arrangement is selected from at least one of the following: Random arrangement: The first type of microlens unit and the second type of microlens unit are randomly distributed according to a preset ratio; Alternating array: In a hexagonal honeycomb arrangement or concentric circle arrangement, the second type of microlens unit is placed at the gap position of the first type of microlens unit; Concentric partitioning: Along the radial direction of the functional area, the distribution density of the second type of microlens unit gradually increases from the inside to the outside.

[0018] Preferably, the fill rate of the micro-optical unit array is 10% to 50%, and the fill rate is configured to be negatively correlated with the amount of retinal imaging contrast attenuation.

[0019] Preferably, the second microlens assembly is a refractive microlens or a diffractive microlens; The sagittal height of the refractive microlens is 2.0 μm to 3.5 μm; The diffractive microlens has a Fresnel zone plate structure with a surface height of less than 1.0 μm.

[0020] Preferably, the central optical region is a smooth curved surface without microstructure, with a diameter of 3.0 mm to 10.0 mm, preferably 5.0 mm.

[0021] As can be seen from the above technical solutions, this invention application has the following beneficial effects: (1) This invention, by deploying a first microlens assembly (+3.50D to +4.50D) and a second microlens assembly (+42.00D to +62.00D) with significant refractive power differences within a single lens functional area, achieves for the first time a deep fusion of the dual optical mechanisms of myopia defocus signal and Maxwell window contrast modulation light curtain at the micro-optical unit level. The second microlens assembly, by precisely focusing on the posterior node of the human eye, triggers the Maxwell window illumination effect, forming a uniform, invisible background light curtain on the retina, physically reducing the imaging contrast; the first microlens assembly simultaneously generates a stable preretinal defocus signal. The two are highly synchronized in time and space, forming a dual-channel synergistic intervention of "defocus + contrast", overcoming the defects of functional separation and single mechanism in traditional technologies, and significantly improving the synergy and predictability of myopia prevention and control effects.

[0022] (2) Compared with existing scattering-type contrast reduction technologies represented by DOT, this invention uses refractive or diffractive Maxwell microlenses to achieve quantitative control of retinal contrast attenuation through precise design of refractive power, fill rate, and arrangement. The contrast attenuation amplitude has a clear negative correlation with the fill rate of the microlens array, possessing the technical advantages of continuous adjustability and quantifiability. At the same time, this solution avoids the inherent problems of halo, excessively large circle of confusion, and decreased central vision in scattering structures. The lens has high transparency, no haze, and no frosted feel, and its appearance is close to that of ordinary single-vision lenses, significantly improving the wearer's visual quality and comfort.

[0023] (3) This invention fully utilizes the gap areas in traditional defocus microlens arrays by introducing independent or composite Maxwell microlens components, transforming the originally optically inactive "dead zones" into functional areas that contribute to the contrast-regulating light curtain. In the hybrid independent array structure, the second type of microlens unit is precisely arranged at the gap position of the first type of unit, significantly improving the optical utilization and filling efficiency of the lens surface; in the composite multi-arc structure, a single microlens unit simultaneously carries out defocusing and Maxwell functions, resulting in a compact structure and integrated functions. At the same time, all microstructures adopt submicron or micron-level surface undulation design (sagitta ≤ 2.8 μm, diffraction type < 1.0 μm), which is invisible to the naked eye and has an invisible appearance, eliminating the psychological rejection of the "special lens" appearance among adolescent users, and combining high performance with high acceptance. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Referring to the drawings will make the features and advantages of the present invention clearer. The drawings are illustrative and should not be construed as limiting the present invention in any way. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the structure of a myopia control defocus lens based on a Maxwell window microlens array provided by the present invention; Figure 2 This is a schematic diagram of the imaging principle in this invention; Figure 3 This is a schematic diagram of the coaxial multi-ring structure in this invention; Figure 4 This is a schematic diagram of the non-coaxial or non-spherical composite structure in this invention.

[0025] Explanation of the reference numerals in the accompanying drawings: 1. Lens substrate; 2. Central optical zone; 3. Functional zone; 4. Micro-optical unit array. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, 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.

[0027] To address the challenges of simultaneously achieving precise and quantifiable retinal contrast regulation and stable myopia defocus signal intervention within the microstructure of a single lens in existing technologies, as well as the technical problems of scattering lenses such as severe halos, decreased central vision, lens fogging, and low optical efficiency. Figures 1 to 4 As shown, this invention provides a myopia control defocus lens based on a Maxwell window microlens array, comprising a lens substrate 1, a central optical zone 2 and a functional zone 3 arranged around the central optical zone 2, and a micro-optical unit array 4 disposed in the functional zone 3; the micro-optical unit array 4 includes at least a first microlens assembly and a second microlens assembly; the first microlens assembly has a first diopter, configured to focus incident light rays in front of the retina to form a myopia defocus signal; the second microlens assembly has a second diopter, configured to focus incident light rays near the posterior node of the human eye to trigger the Maxwell window illumination effect, forming a uniform light curtain on the retina to reduce image contrast; the first diopter and the second diopter are different, and the second diopter is greater than the first diopter.

[0028] The core of this invention lies in the microstructural integration of traditional myopia defocusing technology with the Maxwell window illumination principle. The second microlens assembly possesses ultra-high positive diopter (target value +52.00D), precisely calculated based on the Gullstrand model eye and standard wearing parameters, designed to focus parallel incident light near the nodal point of the human eye. When the focused spot is at the nodal point, the light, upon entering the eye, diverges widely backward from the nodal point, forming a uniformly illuminating retina. This veil, superimposed on a clear image, physically reduces the contrast of retinal imaging by increasing veiling luminance, thereby suppressing abnormal axial growth induced by high-contrast signals. Simultaneously, the first microlens assembly provides a conventional myopia defocus signal (+3.50D to +4.50D), causing some light to focus in front of the retina, directly inhibiting the axial growth signal pathway. These two mechanisms work synergistically on a single lens, achieving dual protection.

[0029] The specific implementation of the present invention will be described in detail below through several embodiments.

[0030] Example 1: Single-function refractive / diffractive Maxwell microlens This embodiment provides an implementation method for achieving simple contrast control using only high-luminosity elements. In this embodiment, the micro-optical unit array 4 only includes the second microlens assembly (i.e., Maxwell microlens) and does not include the first microlens assembly. This solution is suitable for scenarios where the defocus signal has already been obtained through other means, and only the contrast control function needs to be supplemented.

[0031] 1. Refractive Maxwell microlenses The refractive Maxwell microlens of this embodiment employs a spherical or aspherical refractive structure, and its key parameters are as follows: Diopter: +52.00D (corresponding to a focal length of approximately 19mm); Diameter: 0.5mm; Material refractive index: 1.586 (taking CR-39 or MR series commonly used lens materials as an example); Radius of curvature: According to the lens power formula P=(n-1) / R, where P is the diopter (unit D), n is the refractive index, and R is the radius of curvature (unit m), we can calculate R=(1.586-1) / 52≈0.01127m=11.27mm.

[0032] Sag (arch height): According to the spherical sag formula Where D is the lens diameter. Substituting D=0.5mm and R=11.27mm, we calculate h≈2.8μm.

[0033] During the fabrication process, the coating thickness of the hardening fluid must be precisely controlled to ensure the accuracy of the microlens's sagittal height. The refractive Maxwell microlens of this embodiment is formed on the lens surface through precision molding or freeform surface cutting processes. It has high optical efficiency, light transmittance >98%, and is almost completely transparent with no visible haze when viewed from the outside.

[0034] 2. Diffraction-type Maxwell microlens (Fresnel zone plates) As an alternative to the refractive type, this embodiment also provides a diffractive Maxwell microlens, which achieves an ultra-high refractive power of +52.00D using a Fresnel zone plate structure. Its key features are as follows: Structural type: Amplitude-type or phase-type Fresnel zone plate; Surface height: <1.0μm (typically 0.3-0.8μm); Minimum annular band width: determined according to the design formula of the diffraction lens; Process advantages: It can be formed in one step using nanoimprinting, with small surface undulations and high process stability.

[0035] The key advantages of the diffractive scheme are: firstly, the surface microstructure height is significantly lower than that of the refractive scheme, which has less impact on the subsequent hardening coating process; secondly, the diffractive structure has natural dispersion characteristics, which can disperse white light into a weak colored light curtain, further softening the edge of the retinal image and enhancing the contrast control effect; thirdly, because the structural depth is on the submicron level, the lens has excellent transparency and no visible traces of microstructure.

[0036] In this embodiment, the refractive power of the Maxwell microlens can be adjusted within the range of +42.00D to +62.00D to accommodate differences in eye structure among different ethnic groups (corneal-to-node distance). Changes) and differences in wearing position (distance between lenses) (Changes). For example, +55.00D can be selected for pediatric patients or those who wear the lenses too close to their eyes; +48.00D can be selected for those with a large interpupillary distance.

[0037] Example 2: Composite Multi-Segment Microlens Structure This embodiment provides a composite microlens structure, in which each microlens unit is not a single curvature, but consists of at least two different optical regions: a basic microlens region (first microlens assembly) and a Maxwell microlens region (second microlens assembly). This "dual-core" design enables a single microlens unit to simultaneously generate a myopia defocus signal and trigger Maxwell window illumination.

[0038] 1. Structural definition and general parameters The overall diameter of each individual composite microlens unit is preferably 1.1 mm. Wherein: Component A (Basic Microlens): Provides a relative positive power (Add Power) of +3.50D to +4.50D. Its main function is to image in front of the retina, providing a myopic defocus signal.

[0039] Component B (Maxwell microlenses): Provides ultra-high positive light intensity from +47.00D to +57.00D (preferably +52.00D). Its main function is to focus light at the eye node, creating a uniform light curtain to reduce contrast.

[0040] 2. Form A: Coaxial Multi-zone structure This design employs a concentric circle pattern, with the overall microlens unit being circular, resembling a bullseye. Specific dimensions are as follows: Overall diameter: 1.1mm; Diameter of the central region (Maxwell's area): 0.7 mm; Width of the surrounding area (basic out-of-focus area): approximately 0.2mm (i.e., extending from a radius of 0.35mm to 0.55mm); Optical path effect: The central 0.7mm area is the second microlens assembly with a refractive power of +52.00D, which is responsible for focusing the incident light on the nodal point of the eye to generate a uniform light curtain to reduce contrast; the peripheral annular area is the first microlens assembly with a refractive power of +3.50D to +4.50D, which is responsible for focusing the light in front of the retina to generate a myopic defocus spot to inhibit axial growth.

[0041] The characteristic of this form is that the central area accounts for a large proportion (about 40% of the total microlens unit area), which enhances the contrast intervention effect and is suitable for wearers who are highly sensitive to contrast signals but have relatively mild defocus requirements.

[0042] 3. Form B: Non-coaxial / Aspheric Composite Structure This design employs a "lens-on-lens" approach, superimposing or embedding a smaller Maxwell micro-optical feature onto the surface of a larger base microlens. Specific dimensions are as follows: Basic microlens diameter: 1.1 mm (first microlens assembly); Maxwell feature diameter: 0.5 mm (second microlens assembly); Positional relationship: Maxwell features can be located at the geometric apex of the basic microlens (coaxial), or they can be appropriately off-axis according to the incident angle of the peripheral retina.

[0043] The advantage of this form is that it retains a larger area of the basic defocus area (the area ratio of the first microlens component is about 80%), which is suitable for wearers who need a stronger defocus signal, such as teenagers with a faster myopia progression rate and a higher initial refractive power.

[0044] 4. Sagittal height and surface shape design For the composite multi-segment structure, a zoned surface shape design needs to be adopted. Taking the coaxial multi-ring structure as an example: <​​​​​​​​​​​​​​​​​​​​​​​​Type A and Type B units are randomly distributed in functional area 3 according to a specific ratio. Taking the preferred ratio A:B=1:3 as an example (i.e., one Type A unit is paired with three Type B units), random coordinates are generated using the Monte Carlo method, and a minimum spacing constraint is set to avoid unit overlap. Random mixing can simulate the random attenuation of contrast in natural scenes and avoid moiré fringes or interference artifacts that may be generated by periodic structures.

[0049] (2) Interleaved Array In hexagonal honeycomb or concentric circle arrangements, type A units are the main components, with type B units placed in the interstices between them. Since the size of type B units (0.5-0.7 mm) is typically smaller than that of type A units (1.1 mm), a natural "gap area" exists between three adjacent type A units in a traditional hexagonal close-packed array. This area is originally a flat substrate with no optical function. This embodiment precisely arranges type B units in these gap positions, transforming the original "dead zone" into a functional area 3 that generates a beneficial contrast-modulating light curtain, greatly improving the optical utilization of the lens surface.

[0050] (3) Concentric zone layout This arrangement strategy is based on the physiological characteristic that the peripheral retina has higher contrast sensitivity than the central retina: along the radial direction of functional area 3, the closer to the center of functional area 3 (corresponding to the foveal field of vision), the lower the density of class B cells; the closer to the periphery of functional area 3, the higher the density of class B cells. Specifically, functional area 3 is divided into 2-5 concentric rings, with the proportion of class B cells increasing sequentially from the inside out. For example, the inner ring has 10% class B cells, the middle ring has 30%, and the outer ring has 50%. Class A cells are distributed in the opposite direction to ensure that the total fill rate of each ring is within a preset range.

[0051] 3. Fill rate and contrast adjustment In this embodiment, the total fill rate of the micro-optical unit array 4 in the entire functional area 3 (i.e., the ratio of the sum of the projected areas of all microlens units to the total area of ​​functional area 3) is set to 10% to 50%. This fill rate directly determines the extent of the reduction in retinal contrast. When the fill rate increases, the intensity of the Maxwell's light curtain contributed by the Class B units increases, the background brightness increases, and the retinal imaging contrast decreases accordingly. By precisely designing the ratio and arrangement density of Class A and Class B units, the contrast attenuation can be continuously and quantitatively controlled within the range of 10%-50%, achieving a fundamental improvement over the uncontrollable diffusion problem of traditional scattering techniques (such as DOT).

[0052] To fully illustrate the technical principles and the rationality of the parameter settings of this invention, the core mechanism is explained in detail with mathematical derivation and model verification below.

[0053] 1. The Maxwell window principle and the origin of +52.00D The Maxwellian window is a special optical illumination method. When a point light source or lens focuses a spot of light onto the plane or nodal point of the human eye's pupil, that spot becomes a secondary light source. The light rays diverge widely backward from the nodal point, forming a uniformly illuminating screen that covers the retina. This illumination method is unaffected by the refractive state of the human eye, and both nearsighted, farsighted, and astigmatic eyes can obtain a uniform background light superposition.

[0054] To achieve Maxwell window illumination, the focal point of the second microlens assembly must fall on the nodal point of the human eye. This invention calculates the focal length based on the Gullstrand No.1 model eye and standard wearing parameters: (Lens-to-eye distance / apex distance): The distance from the back surface of the eyeglass lens to the apex of the cornea. The standard fitting value is 12mm.

[0055] (Distance from cornea to nodal point): In the simplified Gullstrand model, the distance from the corneal apex to the single equivalent nodal point of the eyeball is approximately 7.08 mm (usually simplified calculations take 7 mm to 7.2 mm).

[0056] Required focal length for microlenses Equal to the total distance from the lens to the node: ; According to the geometric optical focal length formula ( (Units are mm, P is in D): ; The calculated result is approximately +52.41D, which highly matches the target optical power of +52.00D set in the technical disclosure document (corresponding to a focal length of approximately 19mm). This is taken into account the differences in eye structure among different ethnic groups (…). Changes) and differences in wearing position ( (variations), the present invention sets the effective range to +42.00D to +62.00D, covering the anatomical parameter variations of different populations such as Asian children and European and American adults, and also includes the range of processing tolerances.

[0057] 2. Mathematical relationship between fill rate and contrast attenuation This invention reduces contrast by superimposing a uniform veiling luminance on the retina. There is a clear negative correlation between the fill factor and the amount of contrast attenuation, which is quantitatively derived below.

[0058] Define the original contrast ratio: using the Michelson Contrast formula. Let the brightest value of the original image on the retina be... The darkest brightness is ,but: ; Introducing a Maxwell light curtain: Assuming the fill factor of the microlens array on the lens is F (e.g., 0.1 to 0.5), then: Imaging rays: Rays that pass through the substrate (flat or out-of-focus area) form the image, and their intensity is proportional to (1-F). Veiling Luminance: Light rays passing through Maxwell's microlenses do not form an image, but instead create a uniform background light (denoted as veiling luminance). Its strength is directly proportional to the filler ratio F. Let the luminous efficacy coefficient be k (assuming uniform lens transmittance and conservation of light energy, and that Maxwell rays are uniformly distributed on the retina), then the new brightness distribution on the retina becomes: ; ; Derivation of new contrast ratio : ; Substitute into the expression: ; Molecular simplification (subtraction and cancellation of background light term kF): ; Denominator simplification (overlay of background light terms): ; Simplified Model and Approximation: Assuming the average brightness remains constant (light energy is only redistributed, with no absorption loss), the total light quantity in the denominator remains approximately unchanged. In practical applications, to intuitively understand contrast attenuation, we usually focus on the attenuation of the signal amplitude. The contrast attenuation coefficient can be approximated as being related to (1 - fill rate).

[0059] According to Weber's law, background light The increase in fill rate directly leads to a decrease in perceived contrast. If we consider background light as noise and the image as a signal, the decrease in signal-to-noise ratio is directly related to the fill rate F: As F increases → background light curtain Enhance → Significantly enhanced → Contrast decline; Conclusion: The contrast of the lens exhibits a negative correlation with the microlens fill rate. By changing the array density (fill rate F), the contrast of the retinal image can be precisely controlled within the range of 0 to 100%. This is a key advantage of this invention over the uncontrollability of traditional scattering techniques (such as DOT).

[0060] Furthermore, the present invention possesses the following beneficial effects and synergistic mechanisms. 1. Synergistic effect of dual prevention and control mechanisms This invention is not a simple combination of myopia defocus and contrast reduction functions, but a fusion of mechanisms at the optical principle level: Channel 1 (Defocus Channel): The first microlens assembly (+3.5D~+4.5D) focuses some light in front of the retina, generating a stable myopia defocus signal that directly inhibits the eye growth signal pathway. The spatial distribution of this channel is determined by the arrangement density and position of the microlens array, and the signal strength is stable and predictable.

[0061] Channel 2 (Contrast Channel): The second microlens assembly (+52D) projects a very weak and uniform background light onto the retina using the nodal focusing principle. According to Weber's Law, this background light enhances the brightness of the dark areas of the image, and physically reduces the high-frequency spatial frequency contrast of the retinal image without changing the spatial frequency structure of the image, thus reducing the retina's abnormal response to high-contrast edges.

[0062] The two channels are integrated at the microstructural level: in the composite multi-segment structure, the same microlens unit contributes two channels simultaneously; in the hybrid independent array structure, the two types of units are arranged in a staggered manner in space to achieve signal superposition on the retina. This microscale integration ensures the synchronicity of the two intervention signals in time and space, avoiding the asynchrony problems caused by wearing two lenses separately or wearing them at different times.

[0063] 2. Solving the "blind spot" problem of traditional microlenses Traditional microlens arrays (such as HAL) typically have flat light regions between the microlenses, where no interference signals are generated. Furthermore, traditional microlenses themselves have limited imaging quality, with some light rays forming diffuse spots on the retina with uneven energy distribution. This invention achieves the following improvements by introducing Maxwell components: (1) Light curtain filling: Maxwell light diverges widely in the eye, effectively covering retinal micro-areas that traditional microlenses cannot cover. Even the Class B unit located in the microlens gap will generate a light curtain that evenly covers the entire retina, achieving signal coverage without dead angles.

[0064] (2) Comfort optimization: The light from +52D is extremely defocused on the retina, resulting in a very low brightness of the light curtain (usually only 5%-20% of the image brightness), which is almost invisible at the visual perception level. Compared with traditional high-power defocus microlenses (such as +10D and above) that are prone to producing obvious bright spots or ghosting, the Maxwell light curtain of this invention is uniform and soft, significantly improving wearing comfort, and is especially suitable for teenagers who need to wear it for a long time.

[0065] 3. Aesthetic and Invisibility Advantages Compared to existing contrast reduction techniques (such as SightGlass DOT technology which uses laser-etched dot arrays to generate scattering), this invention has significant aesthetic advantages: (1) High transparency: Traditional scattering lattice technology relies on creating nanoscale scattering centers on or inside the lens surface. When light passes through, Mie scattering or Rayleigh scattering occurs, resulting in a noticeable "frosted" or white hazy appearance. In contrast, the Maxwell microlens of this invention is based on the principles of refraction or diffraction. The microstructure surface is smooth and the outline is clear, with a light transmittance of >98%. The lens is almost completely transparent when viewed from the outside. Even under strong side illumination, only a faint outline reflection can be seen, and no haze is generated.

[0066] (2) Uniform appearance: Regardless of whether it is a coaxial composite structure, a lens-on-lens structure, or a hybrid arrangement structure, the micro-optical array is uniformly distributed on the lens surface and has no obvious scattering halo. The curvature of the central area and the peripheral area of ​​the composite multi-arc structure is continuously transitioned without obvious boundaries; in the hybrid independent array, Class B units fill the gaps and are arranged in a regular manner. The overall appearance of the lens is close to that of ordinary single vision lenses, which completely eliminates the psychological burden on patients (especially adolescents in puberty who are sensitive to their appearance) regarding wearing special appearance lenses.

[0067] (3) Invisibility Protection: The surface height of the diffractive Maxwell microlens is less than 1.0 μm, which is far below the wavelength of visible light, and it is difficult to observe obvious structures even under a microscope; the sagittal height of the refractive microlens is about 2.8 μm, which is only equivalent to the diameter of a few red blood cells, and is completely invisible to the naked eye. This makes the lens of the present invention "invisible" in appearance, improving user acceptance and compliance.

[0068] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A myopia control defocus lens based on a Maxwell window microlens array, comprising a lens substrate, wherein the lens substrate has a central optical zone and functional areas arranged around the central optical zone, characterized in that, The functional area is equipped with a micro-optical unit array; The micro-optical unit array includes at least a first microlens assembly and a second microlens assembly; The first microlens assembly has a first diopter, which is configured to focus incident light in front of the retina to form a myopic defocus signal; The second microlens assembly has a second diopter, which is configured to focus incident light near the posterior node of the human eye, triggering the Maxwell window illumination effect to form a uniform light curtain on the retina to reduce image contrast. The first refractive power is different from the second refractive power, and the second refractive power is greater than the first refractive power.

2. The myopia control defocus lens based on a Maxwell window microlens array according to claim 1, characterized in that, The second refractive power range is +42.00D to +62.00D; the first refractive power range is +3.50D to +4.50D.

3. The myopia control defocus lens based on a Maxwell window microlens array according to claim 1 or 2, characterized in that, At least a portion of the micro-optical units in the micro-optical unit array are composite multi-arc microlens structures, and the composite multi-arc microlens structure simultaneously includes the first microlens component and the second microlens component within the same microlens unit.

4. The myopia control defocus lens based on a Maxwell window microlens array according to claim 3, characterized in that, The composite multi-arc segment microlens structure is a coaxial multi-ring structure: The microlens unit is circular in shape, with its central region constituting the second microlens assembly and the annular region surrounding the central region constituting the first microlens assembly. The overall diameter of the microlens unit is 0.8 mm to 1.5 mm; The diameter of the central region is 0.5 mm to 0.9 mm; The width of the annular region is 0.15 mm to 0.35 mm.

5. The myopia control defocus lens based on a Maxwell window microlens array according to claim 3, characterized in that, The composite multi-segment microlens structure is a non-coaxial composite structure: The microlens unit includes a first microlens assembly as a substrate, and a second microlens assembly formed by superimposing or embedding in a local area on the surface of the first microlens assembly. The diameter of the first microlens assembly is 0.8 mm to 1.5 mm; The diameter of the second microlens assembly is 0.3 mm to 0.8 mm; The second microlens assembly is disposed at or off the geometric vertex of the first microlens assembly.

6. The myopia control defocus lens based on a Maxwell window microlens array according to claim 1 or 2, characterized in that, The micro-optical unit array is a hybrid independent microlens array, wherein: The first microlens assembly and the second microlens assembly are respectively disposed in a first type of microlens unit and a second type of microlens unit that are independent of each other; The first type of microlens unit has the first diopter, and the second type of microlens unit has the second diopter; The first type of microlens unit and the second type of microlens unit are arranged in a mixed manner in the functional area.

7. The myopia control defocus lens based on a Maxwell window microlens array according to claim 6, characterized in that, The mixed arrangement method is selected from at least one of the following: Random arrangement: The first type of microlens unit and the second type of microlens unit are randomly distributed according to a preset ratio; Alternating array: In a hexagonal honeycomb arrangement or concentric circle arrangement, the second type of microlens unit is placed at the gap position of the first type of microlens unit; Concentric partitioning: Along the radial direction of the functional area, the distribution density of the second type of microlens unit gradually increases from the inside to the outside.

8. The myopia control defocus lens based on a Maxwell window microlens array according to claim 1, characterized in that, The fill rate of the micro-optical unit array is 10% to 50%, and the fill rate is configured to be negatively correlated with the attenuation of retinal imaging contrast.

9. The myopia control defocus lens based on a Maxwell window microlens array according to claim 1, characterized in that, The second microlens assembly is a refractive microlens or a diffractive microlens; The sagittal height of the refractive microlens is 2.0 μm to 3.5 μm; The diffractive microlens has a Fresnel zone plate structure with a surface height of less than 1.0 μm.

10. The myopia control defocus lens based on a Maxwell window microlens array according to claim 1, characterized in that, The central optical region is a smooth curved surface without microstructure, with a diameter of 3.0 mm to 10.0 mm.

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