Out-of-focus gradual change glasses and manufacturing method

Abstract

The invention relates to the technical field of eye vision optics, and discloses an out-of-focus gradual change glasses and a manufacturing method, the out-of-focus gradual change glasses comprise a glasses frame and optical lenses, the front surfaces of the optical lenses of the glasses are provided with micro-lens nets and clear surfaces, and the rear surfaces of the optical lenses are provided with gradual change channels deviating towards the nose side. The clear surface is constructed to be of an asymmetric structure, the central axis of the clear surface accurately coincides with the track of the progressive channel on the rear surface in the optical axis direction, and it is ensured that the near sight is always located in a micro-lens-free area. According to the manufacturing method, parametric modeling is utilized, and according to the additional luminosity distribution of the rear surface, the defocusing amount of each micro lens unit is calculated by adopting a dynamic compensation algorithm, so that the refractive power of the micro lens is correspondingly reduced along with the increase of the additional luminosity of the rear surface at the corresponding position. According to the invention, through space registration and photometric negative correlation modulation of the optical channels on the front and rear surfaces, the technical problems caused by misalignment of visual lines in near vision and overhigh photometric superposition are solved, and the visual quality and the wearing comfort are improved while the myopia prevention and control effect is ensured.

Description

Technical Field

[0001] This invention relates to the field of optometry technology, specifically to a defocused progressive eyeglass and its manufacturing method. Background Technology

[0002] In recent years, with the increasing demand for myopia prevention and control among teenagers, optical lenses combining microlens defocusing technology and progressive multifocal technology have gradually become a research focus. These lenses aim to provide myopia defocusing signals through the microlens structure on the surface to control axial elongation, while utilizing the progressive power of the substrate to provide accommodative assistance when viewing near objects.

[0003] However, existing designs typically feature a centrally symmetrical microlens array on the front surface and a progressive diopter on the rear surface. This design fails to consider the physiological convergence of the visual axis towards the nose during near vision. When the clear area on the front surface is fixed and symmetrically distributed, the wearer's gaze trajectory during reading or close work will shift towards the nose, moving out of the pre-designed clear area and into the microlens distribution area. This misalignment between the gaze and the optical design area results in unnecessary blurring and ghosting in the near vision region, reducing visual quality.

[0004] Secondly, in existing technologies, the refractive power of the microlens unit is typically set to a constant value, without considering the superposition effect of the anterior and posterior surface luminance. When the posterior surface of the lens provides positive additional luminance in the near vision zone and the progressive path, this additional luminance is directly superimposed on the inherent refractive power of the anterior surface microlens, resulting in excessively high local actual luminance values. This excessive luminance, on the one hand, causes the imaging focal plane to be positioned too far forward, exceeding the appropriate range for the retina to effectively recognize and generate myopia control signals; on the other hand, the significant luminance difference creates a noticeable abrupt change in luminance between the microlens area and the substrate, easily triggering a prismatic effect and causing dizziness in the wearer. Furthermore, the posterior surface of progressive lenses inherently contains a peripheral astigmatic region. If the boundary morphology of the clear area on the anterior surface is not spatially matched with the effective optical path on the posterior surface, the wearer lacks clear visual feedback to lock onto the optimal visual area during dynamic viewing. This spatial mismatch between the anterior and posterior surface optical functional areas makes it difficult for the wearer to quickly find and maintain a clear gaze path, increasing the difficulty of adaptation. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a defocused progressive eyeglass and its manufacturing method, solving the problems of visual interference and unstable axial length control signals caused by the superposition of light intensity in the near vision region in existing defocused eyeglasses.

[0006] The first aspect of this invention provides defocus progressive eyeglasses, including a frame and optical lenses mounted on the frame. The optical lenses are spatially divided into a front surface and a rear surface. The front surface has a microlens network providing defocus signals and a clear surface ensuring a clear central field of vision; the microlens network is composed of an array of multiple microlens units with independent refractive power. The rear surface is designed as a freeform surface with an inner progressive power distribution, and includes a distance vision zone, a near vision zone, and a progressive channel trajectory connecting the distance and near vision zones.

[0007] Preferably, to achieve optical alignment of the anterior and posterior surfaces, the sharp surface of the anterior surface is not a centrally symmetrical shape, but rather an asymmetrical design based on the trajectory characteristics of the progressive channel of the posterior surface. The position of the sharp surface on the optical lens shifts horizontally towards the nasal side as the vertical coordinate changes, and the amount of shift coincides with the amount of inward shift of the progressive channel of the posterior surface due to eye convergence in the optical axis direction. At the same time, the width of the sharp surface in the horizontal direction is non-uniformly distributed, with its width in the distance and near vision zones being greater than its width at the progressive channel, forming a channel structure that is narrower in the middle, wider at both ends, and tilted towards the nasal side overall.

[0008] Preferably, the microlens units in the microlens mesh are arranged in a close-packed hexagonal pattern to maximize the fill rate of the defocus area. The boundary between the microlens mesh and the sharp plane is not simply cut with a straight line; instead, the inner edge of the microlens mesh is formed by connecting the edge contours of multiple microlens units to create a wavy boundary.

[0009] The second aspect of this invention provides a method for manufacturing defocus progressive lenses. The method utilizes digital model construction and photometric compensation algorithms to achieve the collaborative manufacturing of the microstructure of the front surface and the freeform surface of the rear surface. The method includes: acquiring the wearer's prescription data and frame geometric parameters; constructing a model of the rear surface of the optical lens based on the prescription data, generating refractive power distribution data including the distance vision zone, near vision zone, and progressive channel; planning the boundary of the clear surface on the front surface model according to the position and inward displacement of the progressive channel in the rear surface model, ensuring that the central axis of the clear surface of the front surface is spatially aligned with the trajectory of the progressive channel on the rear surface, and defining the area outside the clear surface as a microlens arrangement area; calculating the defocus amount of each microlens unit within the microlens arrangement area and generating the front surface model; and finally integrating the data from the front surface model and the rear surface model, converting them into processing instructions to control the molding process.

[0010] Preferably, when planning the boundary of the clear surface, the system reads the horizontal offset data of the progressive channel trajectory in the posterior surface model to determine the center path of the clear surface on the anterior surface. The logic for constructing the width of the clear surface is as follows: based on the center path, it extends towards the nasal and temporal sides, and the extension width at the corresponding position of the progressive channel is set to be smaller than the extension width at the corresponding positions of the far and near vision zones, thereby forming an hourglass-shaped lenticule-free region with visual guidance function on the anterior surface.

[0011] Preferably, the defocus amount of the microlens unit is not constant across the entire surface, but is calculated using dynamic compensation logic. The calculation process includes: setting a base defocus value for the microlens network; reading the additional photometric value of the back surface model at the corresponding coordinate position; and performing a photometric negative correlation operation, that is, subtracting the weighted value of the additional photometric value at the corresponding position of the back surface model from the base defocus value to obtain the target defocus amount of the microlens unit at that position. This method reduces the refractive power of the microlens unit in the near vision region and on both sides of the asymptotic channel, avoiding the overcorrection effect and higher-order aberrations caused by the superposition of microlens photometric power and back surface asymptotic power.

[0012] Preferably, to ensure that the microlens unit still has basic optical functions after compensation, a minimum photometric threshold is set. When the calculated target defocus amount is lower than this threshold, the defocus amount of the microlens unit is forcibly set to this threshold, and the finally determined defocus amount data is converted into the geometric radius of curvature of the microlens unit surface, thereby forming a microlens array on the front surface with a curvature radius that varies with position.

[0013] Preferably, the processing data synthesis process includes a ray tracing simulation step, which simulates the light path of light passing through the front surface model and the rear surface model to pre-compensate and optimize the system aberrations caused by the alignment deviation of the front and rear surfaces, and generates the final three-dimensional point cloud data.

[0014] Preferably, the optical lens is formed using a composite process. Based on the front surface model data, the front surface, which includes a variable curvature microlens network and an asymmetric clear surface, is pre-formed through mold casting or cutting processes. Then, using the formed front surface as a reference, the rear surface is digitally cut and flexibly polished using a freeform surface turning machine to ensure that the progressive photometric distribution of the rear surface and the microlens distribution of the front surface achieve the spatial correspondence expected by the design in the physical entity.

[0015] This invention provides defocus graduated glasses and a manufacturing method thereof. It has the following beneficial effects: 1. This invention designs the clear surface of the front surface as an asymmetrical structure offset towards the nose, ensuring that the central axis of the clear surface precisely coincides with the inward trajectory of the progressive channel on the rear surface in the optical axis direction. This spatial alignment design takes into account the physiological convergence movement of the human eye during near vision, guaranteeing that the wearer's gaze always passes through the clear area distributed across the microlens units when reading or performing near work. This avoids the problem of ghosting and decreased clarity caused by the pupil falling into the microlens array area due to inward gaze, thus improving the visual quality of the dual-sided composite lens.

[0016] 2. This invention employs microlens dynamic photometric compensation technology to establish a negative correlation function between the refractive power of the microlens unit and the additional photometric value at the corresponding position on the posterior surface. In near vision regions with higher additional photometric value on the posterior surface, the defocusing amount of the anterior surface microlens unit is correspondingly reduced, eliminating the phenomenon of excessively high local refractive power caused by the linear superposition of photometric values ​​on the anterior and posterior surfaces. This ensures that the intensity of the defocus signal projected to the periphery of the retina remains within the linear response range that effectively inhibits axial elongation, while preventing the prismatic effect caused by sudden changes in photometric power, thus improving the wearer's comfort.

[0017] 3. This invention constructs a clear surface boundary on the front surface, which is wider in both the near and far vision zones and narrows at the progressive channel. This clear surface boundary spatially complements the low astigmatism channel on the rear surface. When the gaze deviates from the central path, the defocus blur produced by the microlens acts synchronously with the astigmatism blur around the rear surface, forming a visual feedback signal. This limits the time the eye spends in areas with large aberrations, naturally guiding the gaze through the progressive channel with optimal optical performance, facilitating the wearer to quickly locate and maintain clear vision during gaze movement. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the lens structure of the present invention; Figure 3 This is a front view of the inner surface of the lens of the present invention; Figure 4 This is a flowchart of the present invention; Figure 5 This is a logic flowchart of the present invention.

[0019] The components include: 1. Frame; 2. Optical lens; 3. Microlens network; 4. Clear surface; 5. Front surface; 6. Back surface; 100. Parameter acquisition module; 200. Freeform surface construction module; 300. Microstructure distribution module; 400. Microlens photometric calculation module; 500. Processing data synthesis module. Detailed Implementation

[0020] The technical solutions in 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, and 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.

[0021] Please see the appendix Figure 1 and attached Figure 2This invention provides a defocus graduated eyeglass and its manufacturing method. The defocus graduated eyeglass includes a frame 1 and an optical lens 2 mounted within the frame 1. The optical lens 2 has a front surface 5 as the object side and a rear surface 6 as the eye side. The front surface 5 has a microlens mesh 3 and a clear surface 4. The microlens mesh 3 is composed of an array of multiple microlens units with independent refractive power. The clear surface 4 is the optical area on the front surface 5 where no microlens units are distributed.

[0022] The design and manufacturing method of this invention is implemented through an integrated design system, which includes a parameter acquisition module 100, a freeform surface construction module 200, a microstructure distribution module 300, a microlens photometric calculation module 400, and a processing data synthesis module 500. Each of these modules sequentially performs data processing, converting the wearer's prescription data into models of the front surface 5 and the back surface 6 of the optical lens 2 through calculation.

[0023] See attached document Figure 3 This invention provides a method for manufacturing defocused graduated glasses, comprising the following steps: S1, the parameter acquisition module 100 receives the wearer's prescription data and the geometric parameters of the frame 1. The prescription data includes distance power, near power, and pupillary distance. Near power is the fundamental variable that determines the length of the progressive channel on the posterior surface 6 and the rate of change of power.

[0024] S2, the freeform surface construction module 200 constructs a model of the rear surface 6 of the optical lens 2 based on the data output by the parameter acquisition module 100. The freeform surface construction module 200 uses a freeform surface algorithm to generate an inner progressive photometric distribution. During the construction process, the freeform surface construction module 200 generates a progressive channel connecting the distance and near vision zones on the model of the rear surface 6 and calculates the trajectory of the progressive channel. The progressive channel trajectory is horizontally offset towards the nasal side according to the convergence of the eyeball during near vision, forming an inward displacement. The inward displacement defines the optical center coordinates of each point on the rear surface 6 in the vertical direction, constituting the photometric baseline of the rear surface 6, ultimately obtaining a complete model of the rear surface 6.

[0025] S3, using the microstructure distribution module 300, based on the geometric parameters of the lens frame 1 and the position of the progressive channel, the boundary of the sharp surface 4 is planned on the model of the front surface 5. The microstructure distribution module 300 reads the inward displacement generated by the freeform surface construction module 200 to determine the central axis of the sharp surface 4 on the model of the front surface 5, so that the central axis coincides with the trajectory of the progressive channel on the rear surface 6 in the optical axis direction. The shape of the sharp surface 4 is constructed as an asymmetrical hourglass structure, the width of which varies with the vertical coordinate, being wider in the distance vision zone, gradually narrowing at the progressive channel, and expanding again in the near vision zone, and shifting towards the nasal side overall. The microstructure distribution module 300 sets the area outside the sharp surface 4 as the microlens arrangement area.

[0026] S4, the microlens photometry calculation module 400 calculates the defocus amount of each microlens unit in the microlens mesh 3 filling the microlens arrangement area. The microlens photometry calculation module 400 sets a base defocus value based on the wearer's myopia defocus requirements and reads the additional photometry value of the model on the rear surface 6 at the corresponding coordinate position. Based on a preset compensation algorithm, the microlens photometry calculation module 400 calculates the weighted difference between the base defocus value and the additional photometry value at the corresponding position on the rear surface 6, and determines the calculated weighted difference as the defocus amount of the microlens unit, thereby generating the model of the front surface 5. This step ensures that the refractive power of the microlens unit changes negatively with the additional photometry value at the corresponding position on the rear surface 6.

[0027] S5, the processing data synthesis module 500 integrates the models of the front surface 5 and the rear surface 6. The processing data synthesis module 500 performs ray tracing simulation on the models of the front surface 5 and the rear surface 6, compensating for and optimizing aberrations caused by misalignment between the front and rear surfaces in the simulation results, generating the final 3D point cloud data of the optical lens 2. Finally, the integrated 3D point cloud data is converted into processing instructions, controlling the processing equipment to process and shape the two surfaces of the optical lens 2 substrate respectively, ensuring that the clear surface 4 of the front surface 5 and the progressive channel of the rear surface 6 of the shaped optical lens 2 are spatially aligned.

[0028] The technical implementation details of the above steps will be described in detail below with reference to specific embodiments.

[0029] Before fabricating the defocused graduated glasses, a set of basic design parameters needs to be established to drive the freeform surface calculations. These parameters are acquired and processed by the parameter acquisition module 100 to provide numerical references for the subsequent construction of the model of the rear surface 6 and the photometric compensation of the microlens mesh 3 of the front surface 5.

[0030] Obtain the wearer's baseline refractive parameters using optometry equipment, including the distance spherical power. , cylinder power and cylinder axis Simultaneously, facial geometric parameters of the wearer are measured, specifically including monocular interpupillary distance. He Tonggao .

[0031] The key to this embodiment lies in the amount of near-field photometric addition. The determination logic is as follows. Unlike traditional progressive multifocal lenses that determine the near power input solely based on age or presbyopia, this solution sets the near power input based on the wearer's negative accommodative function parameters. These parameters reflect the relaxation potential and accommodative hysteresis of the ciliary muscle during near vision. Near power input... The numerical setting range is +1.00D to +2.50D. This value must be determined to meet the requirements of ciliary muscle training load, that is, by providing additional light power higher than the normal near vision requirements, the ciliary muscle is forced to remain relaxed during near vision, thereby producing a negative accommodation training effect.

[0032] During the specific parameter setting process, the calculation and processing unit determines the final near-field photometric addition amount based on the measured adjustment hysteresis and the preset training load. The three satisfy a linear superposition relationship: ; In the formula, This represents the difference between the wearer's accommodative response and the accommodative stimulus at a predetermined working distance, and is usually a positive value; The additional optical load applied to enhance ciliary muscle relaxation training is dynamically adjusted based on the wearer's adaptability and binocular vision function test results. If the calculated result exceeds +2.50D, the upper limit is taken to avoid excessive convergence caused by excessively high positive lens power leading to a short near working distance.

[0033] Determined near-photometric addition amount It serves not only as the target luminance of the model near vision zone of the lens's posterior surface 6, but also as an input variable for calculating the model asymptotic channel length and inward displacement of the lens's posterior surface 6. Higher The value corresponds to the change in the refractive power gradient of the model on the posterior surface 6, which requires that subsequent model design must have a corresponding aberration control mechanism. The system will determine the above-mentioned... as well as These parameters are integrated into a design parameter vector, serving as boundary constraints for the freeform surface construction module 200 and the microlens photometric calculation module 400. These parameters determine the sag distribution trend of the freeform surface model on the rear surface 6 of the lens, and the reference photometric value for photometric compensation calculation of the microlens mesh 3 on the front surface 5. Through precisely quantified negative adjustment parameter input, it is ensured that the final optical lens 2 can achieve targeted myopia control and visual function training functions.

[0034] When constructing the model of the rear surface 6 of optical lens 2, the design of the asymptotic channel involves not only the longitudinal change of luminance, but more importantly, determining the planar projection trajectory of the luminance gradient centerline on the model surface, i.e., the principal meridian trajectory. The principal meridian trajectory defines the distribution path of the astigmatic minimum on the model of the rear surface 6, and also serves as the geometric reference for the design of the visual guide rail of the model of the front surface 5.

[0035] The construction of the progressive channel trajectory is based on the wearer's physiological convergence movement during near vision. When the human eye switches from distance vision to near vision, the visual axes of both eyes rotate nasally inward, causing a horizontal displacement of the point of penetration of the line of sight on the lens. This horizontal displacement is called the inward displacement. To ensure that the wearer can obtain clear binocular vision throughout the progressive zone and near vision zone, the centerline of the model progressive channel on the rear surface 6 must coincide with the trajectory of the line of sight on the optical lens 2.

[0036] Horizontal coordinates of the principal meridian With vertical coordinates It changes with the changes. Setting the geometric center of optical lens 2 as the origin (0,0), the principal meridian of the distance viewing area is usually located at... On the vertical line. For the near vision zone, the maximum inward displacement Determined based on geometric optical imaging relationships. The distance from the center of rotation of the human eye to the rear vertex of optical lens 2 is set as... The wearer's interpupillary distance is The preset near working distance is Maximum inward shift The following geometric relations must be satisfied: ; In the formula, The interpupillary distance is for one eye. The distance between the centers of eyeball rotation. This is the working distance. The formula accurately calculates the geometric intercept deviation on the lens plane when the line of sight is focused on a nearby object.

[0037] After determining the viewing point and near point Subsequently, the asymptotic channel trajectory The vertical connection is not linear, but rather follows the kinematics of downward eye movement. The asymptotic trajectory is typically described as a continuously differentiable, smooth curve. In the asymptotic zone region ( The instantaneous inward shift of the principal meridian It is related to the instantaneous adjustment force required at that point.

[0038] Set the additional photometric scaling factor for this point as: ( If ), then the trajectory function can be expressed as: ; in, This is the luminance gradient function, describing the rate distribution of luminance increase from the distance viewing zone to the near viewing zone. It is typically fitted using a polynomial or spline function to ensure the smoothness of the luminance change. (Asymptotic channel trajectory function) The umbilicus line was established in the model design of the posterior surface 6, meaning that the principal curvature difference approaches zero and there is no significant astigmatism along the umbilicus line. Based on this trajectory, the freeform surface construction module 200 extends to both sides to generate freeform surface model data with peripheral astigmatism distribution. This model data not only defines the refractive characteristics of the posterior surface 6 model, but also its trajectory parameters. Simultaneously, it is output to the model layout design stage of the front surface 5 as the alignment standard for the asymmetric offset of the microlens-free clear surface 4 of the model on the front surface 5, thereby achieving spatial consistency between the optical channels of the model on the front surface 5 and the model on the rear surface 6.

[0039] After establishing the trajectory of the asymptotic channel, the freeform surface construction module 200 generates refractive distribution data for the entire model surface 6 of the rear surface based on the freeform surface mathematical model. This process aims to generate a two-dimensional coordinate domain defined on the rear surface 6. scalar functions on This function represents the model of the back surface 6 at arbitrary coordinates. Additional photometric value relative to the reference degree.

[0040] The generation of the model refractive spectrum of the posterior surface 6 first determines the longitudinal photometric gradient based on the photometric variation along the principal meridian. Definition Along the axis, the ordinate of the near-field stable point is The ordinate of the stable point in the far field is Asymptotic channel length Within the asymptotic channel region, the additional luminosity along the principal meridian... The photometric growth follows a smooth and continuous function to ensure visual comfort during vertical eye movement. This growth law satisfies the following polynomial function model: ; Among them, normalized variables Defined as The range of values ​​is ; This is the maximum near power addition set in the preceding steps. The formula employs cubic polynomial smooth interpolation logic to ensure that the rate of change in power is zero at the boundaries of the distance and near vision zones, achieving a seamless transition of refractive power and eliminating image jitter.

[0041] After determining the principal meridian luminosity Subsequently, the system extends the calculation of the photometric distribution across the entire surface to both sides of the principal meridian. Due to the intrinsic geometric optics properties of the progressive multifocal lens, surface astigmatism inevitably occurs on both sides of the progressive channel. The freeform surface construction module 200 uses an optimization algorithm to control the distribution area of ​​astigmatism, pushing the high astigmatism region towards the edge of the optical lens 2, thereby retaining a certain width of low astigmatism region, i.e., the optical channel, on both sides of the principal meridian. Arbitrary points of the model on the rear surface 6 Actual additional luminosity The astigmatism is determined by the average curvature at that point. In numerical calculations, astigmatism within the optical channel is minimized by solving partial differential equations, and the resulting final refractive index data is stored as high-density model data.

[0042] Refractive atlas The data has two layers of meaning: First, it directly corresponds to the physical vector distribution of the model on the back surface 6 of the lens, by converting photometric data into geometric coordinates by combining the refractive index of the lens material. Firstly, it serves two purposes: 1) guiding the cutting path on a freeform surface CNC lathe; and 2) acting as a photometric variable field, serving as a crucial input source for the design of the microlens mesh 3 on the front surface 5 model. The local photometric value at each coordinate point in the atlas participates in the compensation calculation of the microlens unit parameters at the corresponding position on the front surface 5 model. Specifically, the high additional photometric values ​​in the near-vision zone and the high astigmatism values ​​on both asymptotic sides are marked as key reference data, used for boundary determination of the visual guide rails on the front surface 5 model and negative correlation modulation of the microlens unit photometric values.

[0043] See attached document Figure 5 The microstructure distribution module 300 performs geometric reconstruction of the optical functional areas of the model of the front surface 5 based on the progressive channel data generated by the freeform surface construction module 200. Unlike traditional defocus lenses that use a centrally symmetrical circular or elliptical clear surface 4 design, this embodiment constructs an asymmetrical clear surface 4 that dynamically changes with the trajectory of the line of sight. The boundary shape of the clear surface 4 constitutes a visual guide that restricts the trajectory of eye movement.

[0044] The region partitioning logic of the model on the front surface 5 is based on the plane coordinate inequality. Let the coordinates of any point on the model on the front surface 5 be... The microstructure distribution module 300 determines the attributes of a point by calculating the horizontal distance from that point to the visual center trajectory. The visual center trajectory directly inherits the principal meridian trajectory of the model of the rear surface 6 determined in the above steps. This means that the optical center line of the model on the front surface 5 is no longer a vertical straight line, but a curve that slopes towards the nose, precisely coinciding with the inward displacement of the model on the rear surface 6.

[0045] The geometric boundary of clear plane 4 is determined by the half-width function. Definition. This function describes the horizontal coverage range of the clear surface 4 at different vertical heights. To accommodate the physiological characteristics of the human eye—a wider field of vision for distance viewing and focused near vision—and to match the narrowing characteristics of the entry channel of the rear surface 6 model, the half-width function... Designed to follow The axial direction shows a trend of first narrowing and then widening.

[0046] Set the half-width of the viewing area to The half-width of the near region is The half-width at the narrowest point of the asymptotic channel is The corresponding vertical position parameters are as follows: The coordinates of the lower boundary of the viewing area are: The coordinates of the upper boundary of the near-field region are... Let be the vertical coordinate of the narrowest point of the channel, and let the parameters satisfy the following geometric relationships: and .

[0047] Based on the above parameters, the microstructure distribution module 300 uses a piecewise function to construct the half-width distribution model of the clear surface 4, as shown in the following formula:

[0048] in, Indicates that at the vertical coordinate is At that time, the half-width of the target on one side of the clear plane 4; The vertical coordinate variable represents the surface of optical lens 2, with the geometric center of optical lens 2 as the origin and upward as positive; This is a preset constant half-width value for the distance viewing area; This is a preset constant half-width value for the near vision zone; This is the minimum half-width value of the preset intermediate transition area; The vertical coordinate is the boundary between the stable viewing area and the upper gradual transition area. To achieve the minimum half-width The position of the vertical coordinate at that time; The vertical coordinate is the boundary between the near-stable region and the lower gradual transition region.

[0049] After determining the half-width distribution The system combines the asymptotic channel center trajectory of the model of the rear surface 6 determined in the aforementioned steps. If the following inequality conditions are satisfied, for any point on the model of the front surface 5... Perform region attribute determination; The decision logic is as follows: Calculate any point to the center trajectory The absolute value of the horizontal distance; if the absolute value of the horizontal distance is less than or equal to the half width corresponding to the height. If the point is within the clear plane 4, then it is determined that the point is located within the clear plane 4; otherwise, if the absolute value of the horizontal distance is greater than 1, then the point is determined to be located within the clear plane 4. If the point is located within the distribution area of ​​the microlens network 3, then it is determined that the point is located within the distribution area of ​​the microlens network 3. Through this determination logic, the clear surface 4 is macroscopically characterized by an asymmetrical geometric feature: a wide upper part, a narrow middle part, a renewed expansion at the bottom, and an overall tilt towards the nose following the central trajectory.

[0050] The technical effect of this design lies in forming a visual guide mechanism. When the wearer's gaze attempts to enter the microlens mesh 3 through the boundary of the clear plane 4, a defocus blur signal caused by the microlenses suddenly appears in the retinal image. This peripheral blur signal acts as a negative feedback mechanism, restricting the free movement of the eyeball at the level of neural reflexes, forcing the gaze to remain within the channel of the clear plane 4. Due to the central trajectory of the clear plane 4... The optimal photometric channel of the model on the rear surface 6 is spatially precisely aligned. This guide mechanism ensures that when the wearer uses the high near-vision lens 2, their line of sight always follows the path of least aberration, thus solving the problem of finding a clear point in the near-vision zone of progressive lenses. The microstructure distribution module 300 outputs the region division data, which serves as a spatial index for the subsequent placement of the microlens network 3 and photometric calculations.

[0051] The asymmetric design of the sharp plane 4 is not randomly generated, but strictly follows the optical property distribution of the model of the rear surface 6 of the optical lens 2 to achieve spatial registration of the optical channels of the model of the front surface 5 and the model of the rear surface 6. In traditional rotationally symmetric defocus lens designs, the sharp plane 4 is usually centered on the geometric center of the optical lens 2. The center is the point on the circle; in this embodiment, the central axis of the clear surface 4 follows the vertical coordinate. The descent causes a nonlinear horizontal displacement towards the nose.

[0052] Specifically, the coordinates of the left boundary of the clear plane 4 in the horizontal direction. and right boundary coordinates They are determined by the following formulas respectively: ; ; In the formula, The asymptotic channel trajectory on the model of the rear surface 6 as determined above. This is half the width at that height. Due to the near-viewing area... equal to the inward shift This causes the clear surface 4 to deviate from the vertical axis of symmetry of the optical lens 2 in physical space. For example, when the inward shift... When set to 2.5mm, the entire near vision clear plane 4 is shifted 2.5mm nasally relative to the geometric center of the optical lens 2. This asymmetry in position ensures that when the wearer is reading or doing close work, their line of sight naturally passes through the area where microlens units are not distributed, without having to forcibly adjust their head or eye position to find the optical center.

[0053] In addition, to enhance the constraint function of the vision guide, the half-width of the clear surface 4 is... The astigmatic boundary of the progressive channel on the model of the rear surface 6 is defined to correspond to that of the astigmatic channel. The width of the progressive channel on the model of the rear surface 6 is typically defined as the width of the region where the astigmatic value is below 0.05D. In this embodiment, the width of the sharp plane 4 at near vision is defined. Slightly less than or equal to the asymptotic channel width at the corresponding position on the rear surface 6 of the model. A typical value setting is: half the width of the distance viewing area. The value ranges from 5.0mm to 7.0mm to ensure a wide field of vision; the half-width at the narrowest point of the progressive channel ranges from 3.0mm to 4.0mm; the half-width of the near vision zone... The value ranges from 4.0 mm to 6.0 mm.

[0054] By narrowing the boundary of the sharp surface 4 of the model on the front surface 5 and precisely overlapping it spatially with the progressive channel of the model on the rear surface 6, a composite visual guide is formed. The guide works by ensuring that when eye movement causes the line of sight to deviate from the central axis, the line of sight simultaneously touches the boundary of the microlens mesh 3 on the front surface 5 and the boundary of the high astigmatism zone on the rear surface 6. The defocus blur signal generated by the microlens unit and the astigmatism blur signal generated by the rear surface 6 are spatially triggered synchronously. This dual blur feedback mechanism can be more sensitively captured by the visual nervous system, thus quickly guiding the eye back to the central path of the sharp surface 4. This design overcomes the keyhole effect caused by the mismatch between the models of the front surface 5 and the rear surface 6 in existing technologies, where the wearer, although passing through the sharp surface 4 of the front surface 5, falls into the astigmatic zone of the rear surface 6, causing visual interference and difficulty in adaptation. Through the asymmetric spatial mapping of this embodiment, it is ensured that when light passes through any effective viewpoint of the optical lens 2, the photometric parameters of both the front surface 5 and the rear surface 6 are at their designed optimal state.

[0055] The microlens network 3 is composed of a large number of microlens units discretely distributed on the front surface 5 substrate of the optical lens 2. This embodiment employs a high fill rate array arrangement strategy to ensure sufficient defocusing amount per unit area.

[0056] The array structure of the microlens units preferably adopts a close-packed hexagonal arrangement. Geometrically, the line connecting the geometric centers of any three adjacent microlens units forms an equilateral triangle. Compared to a rectangular array, this arrangement minimizes the gap area between microlens units while maintaining the same microlens diameter, thereby increasing the duty cycle of the lens area. The diameter of the microlens unit is set to a fixed value, typically between 0.8 mm and 1.2 mm. The center-to-center distance between adjacent microlens units is set to be slightly larger than their diameter, and the difference between the two constitutes the transition zone between microlenses. The transition zone is maintained as a smooth curved surface consistent with the base curve of the front surface 5, ensuring the integrity of the optical lens 2's appearance and facilitating demolding during mold processing.

[0057] The arrangement of the microlens mesh 3 is achieved through a filtering logic based on Boolean operations. During the design phase, the microstructure distribution module 300 first generates a complete set of virtual microlens unit arrays covering the entire front surface 5 with the original aperture of the model. Subsequently, the system introduces the boundary of the sharp plane 4 determined in the aforementioned steps as a mask to filter this complete set. The filtering principle follows an integrity preservation logic: for each microlens unit in the array, the shortest distance between its geometric edge and the boundary of the sharp plane 4 is calculated. Only when the microlens unit is completely outside the boundary of the sharp plane 4, or its area within the sharp plane 4 is less than a preset threshold, is the microlens unit retained in the final model of the front surface 5.

[0058] For the arrangement at the junction of the sharp plane 4 and the microlens mesh 3, this embodiment employs a dynamic edge processing strategy. To avoid irregularly cut lenses at the edge of the visual guide, the system performs a yield judgment during screening. When the projection area of ​​a microlens unit crosses the boundary line of the sharp plane 4, the system determines that the microlens unit is invalid and discards it. This strategy ensures that the inner edge of the microlens mesh 3 is not an absolutely smooth straight line or curve, but a micro-wavy boundary formed by the tangent edges of countless microlens units. This processing method eliminates the prism effect or stray light caused by the physical truncation of the lenses, ensuring that the wearer's line of sight directly enters the complete defocus area from the purely flat area when crossing the boundary, thereby obtaining a clear and unambiguous visual feedback signal. The system finally outputs the three-dimensional coordinate data of the retained microlens units as the target object for subsequent photometric calculations.

[0059] This invention identifies and solves an optical interference problem caused by the simple superposition of photometric values ​​from the front surface 5 and the rear surface 6 when constructing a double-sided composite optical system. During the passage of light through the optical lens 2, its wavefront shape is continuously modulated by the microlens unit refractive surfaces on the front surface 5 and the freeform refractive surfaces on the rear surface 6. For any coordinate point on the optical lens 2 where the microlens network 3 is distributed... The total refractive effect of this position on the incident beam is not an independent effect of a single surface, but a combined effect of the local curvatures of two surfaces.

[0060] This combined effect follows the principle of photometric superposition. Definition The nominal defocus power provided by the microlens unit on the front surface 5 This provides additional photometric values ​​for the model of rear surface 6 at the corresponding locations. In the distance viewing region, the additional photometric values ​​are due to the geometry of the model of rear surface 6. Approaching zero, the effective defocus amount in this area is mainly determined by... The decision can generate an image position that moves forward as designed, forming an effective myopic defocus signal.

[0061] However, in the near vision region and the regions on both sides of the asymptotic channel, in order to achieve negative accommodation, the model of the posterior surface 6 was designed to have a positive refractive power increment, i.e. The value gradually increases as the vertical coordinate decreases, until it reaches the set maximum near-field photometric addition. If the microlens network 3 of the model on the anterior surface 5 maintains constant geometric parameters and refractive power throughout the entire region, then in the near vision region, the actual luminance acting on the human eye will be the algebraic sum of the luminance of the microlens unit and the additional luminance value of the model on the posterior surface 6. For example, when the luminance of the microlens unit is set to +3.50D, and the near luminance added to the model on the posterior surface 6 is +2.50D, the superposition of the two will result in a local instantaneous refractive power of +6.00D.

[0062] This excessive refractive power resulting from the linear superposition of photons leads to severe image quality degradation. From the perspective of retinal imaging optics, excessively high positive photon power causes the image focal point to shift excessively forward relative to the retinal plane, resulting in a sharp increase in the size of the defocused image spot projected onto the periphery of the retina, and a corresponding decrease in light energy density. This excessively discrete light signal exceeds the linear response range that retinal ganglion cells can effectively recognize and convert into signals that inhibit axial elongation, thus weakening the effectiveness of myopia control. At the same time, excessive photon power difference creates a steep photon power step between the clear surface 4 and the distribution area of ​​the microlens network 3, triggering a strong prismatic effect and higher-order astigmatism. This visual interference no longer serves as a gentle line of sight guidance, but instead causes dizziness or visual fatigue in the wearer. Therefore, in order to ensure stable defocus function on progressive lenses with high near-use photon power addition, it is necessary to introduce inverse compensation logic for the photon power distribution of the model on the rear surface 6 into the model on the front surface 5.

[0063] See attached document Figure 4The microlens photometric calculation module 400 establishes a dynamic compensation model based on spatial location to address the aforementioned photometric superposition interference problem. The core of this model lies in setting the refractive power of the microlens unit as a variable, rather than a constant value. This variable has a negative correlation with the additional photometric value of the model on the rear surface 6 at the corresponding coordinate position, thereby constructing a photometrically gradient microlens array on the model on the front surface 5.

[0064] The dynamic compensation model defines the defocus amount, which represents the ideal defocus intensity projected onto the peripheral retina as designed. To maintain the stability of the defocus signal across the entire area of ​​optical lens 2, the microlens unit at any coordinate point... The apex refractive power The following compensation equation must be satisfied: ; In the formula, The base defocus value is the initial refractive power of the microlens unit in the region with zero added luminous power on the model on the rear surface 6, typically ranging from +3.50D to +4.50D. The model refractive index of posterior surface 6 in coordinates The additional photometric value at that location is derived from the output data of the freeform surface construction module 200; This is the compensation coefficient, and its value range is... .

[0065] compensation coefficient The setting determines the degree of light smoothing. When At that time, a full compensation strategy is implemented, meaning that the reduction in refractive power of the microlens unit is strictly equal to the increase in the model's additional photometric value on the rear surface 6, so that the total defocus amount after synthesis is... It remains constant within the range of the entire optical lens 2. When When the value is between 0.5 and 1.0, an undercompensation strategy is implemented, allowing a moderate increase in the total defocus in the near vision zone to compensate for the image plane drift caused by eye accommodation during near vision, but this increase is strictly limited to within the retinal linear response threshold.

[0066] To convert the above photometric data into machinable geometric parameters, the calculation module calculates based on the refractive index of the material of optical lens 2. The calculated weighted difference Converted to the radius of curvature of the microlens unit surface The conversion formula is as follows: ; Based on this formula, the microlens mesh 3 exhibits a geometric gradient characteristic of being convex at the top and flat at the bottom. In the distance vision region, the microlens unit has a small radius of curvature and a steeper surface, providing high refractive power; as the coordinates move downwards into the asymptotic channel and near vision region, the radius of curvature of the microlens unit gradually increases, the surface tends to be flatter, and the refractive power provided decreases accordingly.

[0067] In addition, to prevent the microlens units from becoming too dim or even disappearing due to overcompensation, the model sets a minimum photometric threshold. If calculated according to the formula Less than The system will force This constraint ensures that even in areas with extremely high near-field photometric input on the rear surface 6, the microlens units of the front surface 5 retain their basic defocusing function, maintaining the boundary sharpness of the visual guide. Through this point-by-point calculation and geometric reconstruction, the microlens network 3 is no longer a uniform array, but a variable photometric array that precisely complements the photometric distribution of the freeform surface of the rear surface 6, achieving decoupling and synergy of the optical functions of the front surface 5 and the rear surface 6.

[0068] Based on the aforementioned dynamic compensation model, the microlens photometric calculation module 400 divides the microlens mesh 3 of the model on the front surface 5 of the optical lens 2 into three functional regions with different photometric characteristics: a high defocus for distant use, a gradient transition region, and a low defocus for near use. This zoning control is not achieved through physical division, but through a natural transition formed by the continuous change of the curvature radius of the microlens unit.

[0069] In the distance viewing region, the geometry of the model on the rear surface 6 remains as the distance photometric reference, with its additional photometric value... The value approaches zero. According to the compensation equation, the microlens units in this region are assigned a base defocus value. This value is typically set to a high level. This area covers the wearer's primary peripheral field of vision when looking at distant objects. The purpose of maintaining a high defocus microlens unit in this area is to provide a high-intensity myopic defocus signal that acts directly on the peripheral retina to suppress abnormal axial elongation during distance vision. Since the model on the posterior surface 6 has no significant astigmatic interference at this time, the high defocus microlens mesh 3 will not cause excessive visual confusion, ensuring maximum myopia control effectiveness.

[0070] In the near-vision region, the additional photometric value of the model on the rear surface 6 reaches its maximum. To avoid the aforementioned photometric superposition interference, the microlens units in this region perform maximum negative compensation. The calculated defocusing amount of the microlens units... Reduced to the lowest level across the entire lens. For example, if a full compensation strategy is adopted. At this point, the defocusing amount of the microlens unit is only This low defocus design has significant optophysiological implications: on the one hand, it prevents excessive contraction of the near field of vision due to excessive total illumination, avoiding the tunneling effect when reading; on the other hand, the moderately retained microlens unit defocus still maintains the necessary blur gradient at the boundary of the sharp plane. This means that although the defocus is reduced, there is still a perceptible difference in image quality at the periphery compared to the completely sharp central channel, thus continuing to maintain the boundary constraint function of the visual guide and preventing the gaze from unconsciously slipping out of the comfort zone.

[0071] In the gradient transition region, the defocus distribution of the microlens unit exhibits a decreasing gradient opposite to the progressive channel power growth rate on the model of the rear surface 6. As the line of sight moves down the progressive channel, the positive power provided by the model of the rear surface 6 gradually increases, the curvature of the corresponding microlens unit surface gradually flattens, and the focal length gradually lengthens. This reverse matching design cleverly addresses the inherent peripheral astigmatism problem of progressive lenses. On both sides of the progressive channel, the model of the rear surface 6 exhibits significant irregular refractive power. Superimposing microlens units with high defocus in this area would exacerbate the distortion and shakiness of the peripheral image. By dynamically compensating to reduce the defocus of the microlens unit in this region, the additional aberrations introduced by the microlens unit are also reduced, thereby improving the wearer's dynamic visual comfort during eye movement while maintaining the defocus control function. Ultimately, through this zonal control, a relative balance of the total defocus across the entire range of the optical lens 2 is achieved, avoiding the technical defect of excessive defocus in the near vision zone in traditional designs.

[0072] This embodiment employs a hybrid manufacturing process that combines die casting of the front surface 5 with freeform turning of the rear surface 6 to ensure a precise match between the integrity of the microstructure of the front surface 5 and the customized precision of the photometric distribution of the rear surface 6.

[0073] The manufacturing process begins with the precision machining of the front surface 5 glass mold. Unlike conventional single-degree microlens molds, the surface morphology required for this process needs to be constructed point-to-point based on the model of the front surface 5 generated in the preceding steps. A computer numerical control (CNC) grinding machine reads the curvature radius of the microlens unit, which includes the full lens coordinates. The data matrix is ​​used to carve thousands of micro-dimples with varying radii of curvature on the concave surface of the glass mold. During the processing, for the mold area corresponding to the clear surface 4, the machine tool maintains this area as a smooth optical surface; for the area corresponding to the microlens mesh 3, the tool path strictly follows the preset asymmetric boundary conditions to ensure that the distribution of the dimples on the mold is completely consistent with the shape of the clear surface 4 required by the design.

[0074] After obtaining the glass mold with a gradient micro-dimple array, injection molding and curing molding processes are performed. Liquid optical resin monomer is injected into the cavity composed of a front surface mold 5 and a standard rear surface mold 6. After programmed temperature curing and demolding, a semi-finished optical lens blank 2 containing the microlens mesh 3 on the front surface 5 is obtained. At this time, the front surface 5 of the semi-finished blank has been cured with the microlens mesh 3 having a gradient optical intensity characteristic of convex upper surface and flat lower surface, as well as an asymmetric clear surface 4 structure, but its rear surface 6 is still a primary spherical surface to be processed.

[0075] The key process step lies in the alignment turning of the freeform surface 6 on the rear surface. To achieve precise spatial coupling between the clear surface 4 on the front surface 5 and the progressive channel on the rear surface 6, a strict machining coordinate system must be established. When the semi-finished optical lens 2 blank is fixed in the chuck of the freeform lathe, the system identifies the implicit mark or geometric center of the front surface 5 of the blank and defines it as the machining origin. The machining control unit retrieves the machining instructions generated from the model of the rear surface 6 produced in the above steps, and controls the diamond tool to perform aspherical cutting on the rear surface 6 of the blank.

[0076] During this cutting process, the lathe's feed path needs to take into account the inward shift design of the front surface 5. This is because the central axis of the clear surface 4 of the front surface 5... Since the inward displacement has already been included, the cutting center of the rear surface 6 must be perfectly aligned with this trajectory. Any rotational or translational deviation will prevent the wearer's line of sight from falling within the optimal progressive channel of the rear surface 6 after passing through the clear surface 4, thus disrupting the synergistic effect of the dual-sided design. Therefore, the machining equipment performs multi-axis linkage control, transferring the model data of the rear surface 6... It is precisely physically mapped to the coordinate position corresponding to the feature 5 on the front surface.

[0077] After turning, the rear surface 6 undergoes flexible polishing. Since the rear surface 6 is a continuous free-form surface without microstructures, an adaptive flexible polishing head can be used to remove cutting marks and improve light transmittance. During polishing, the amount of material removed must be strictly controlled to avoid altering the refractive power gradient of the progressive channels on the rear surface 6. Finally, after conventional surface treatments such as hardening and anti-reflective coating, the finished optical lens 2 is obtained. This process first replicates the complex variable-power microlens network 3 onto the front surface 5, and then uses high-precision subtractive manufacturing technology to generate customized progressive refractive power on the rear surface 6, physically realizing the aforementioned design concepts of diopter zoning and aberration complementation.

Claims

1. A defocus graduated optical eyeglass, comprising a frame (1), characterized in that, An optical lens (2) is mounted on the frame (1). The optical lens (2) has a front surface (5) and a rear surface (6). The front surface (5) has a microlens mesh (3) and a clear surface (4). The microlens network (3) is composed of an array of multiple microlens units with independent refractive power, and the clear surface (4) is the area on the front surface (5) where the microlens units are not distributed.

2. The defocus graduated glasses according to claim 1, characterized in that, The rear surface (6) is provided with a far vision zone, a near vision zone, and a progressive channel trajectory connecting the far vision zone and the near vision zone, and the progressive channel trajectory is offset towards the nose.

3. The defocus graduated glasses according to claim 2, characterized in that, The width of the clear surface (4) in the far field of vision is greater than the width at the progressive channel trajectory, and the width of the clear surface (4) in the near field of vision is greater than the width at the progressive channel trajectory.

4. The defocus graduated glasses according to claim 1, characterized in that, The microlens units in the microlens mesh (3) are arranged in a close-packed manner of regular hexagons, and the inner edge of the microlens mesh (3) is a wavy boundary formed by the edges of multiple microlens units.

5. A method for manufacturing defocused graduated neutral density glasses, characterized in that, The method for preparing a defocused progressive eyeglasses according to any one of claims 1-4 includes the following steps: The prescription data of the wearer and the geometric parameters of the frame (1) are obtained through the parameter acquisition module (100). The prescription data includes distance power, near power and pupillary distance. The model of the rear surface (6) of the optical lens (2) is constructed by the freeform surface construction module (200) according to the prescription data. The distance vision zone, the near vision zone and the progressive channel connecting the two are generated on the model of the rear surface (6) to obtain the complete model of the rear surface (6). Based on the geometric parameters of the lens frame (1) and the position of the progressive channel, the microstructure distribution module (300) plans the boundary of the clear surface (4) on the model of the front surface (5) and sets the area outside the clear surface (4) as the microlens arrangement area. The defocusing amount of each microlens unit in the microlens net (3) filling the microlens arrangement area is calculated by the microlens photometric calculation module (400), and the model of the front surface (5) is generated accordingly. The processing data synthesis module (500) integrates the model of the front surface (5) and the model of the rear surface (6), converts the integrated model data into processing instructions, and controls the processing equipment to process and shape the two surfaces of the optical lens (2) substrate respectively.

6. The method for manufacturing defocused graduated glasses according to claim 5, characterized in that, The planning of the boundary of the clear surface (4) through the microstructure distribution module (300) specifically includes: Read the horizontal offset of the progressive channel trajectory generated by the freeform surface construction module (200); The central axis of the clear surface (4) on the model of the front surface (5) is determined according to the offset, so that the central axis coincides with the progressive channel trajectory in the optical axis direction; Based on the central axis, the width is extended to the nasal and temporal sides to construct the clear surface (4), such that the width of the clear surface (4) at the progressive channel is smaller than the width in the far vision zone and the near vision zone.

7. The method for manufacturing defocus graduated glasses according to claim 5, characterized in that, The defocusing amount is calculated through the microlens photometric calculation module (400), specifically including: The basic defocus value of the microlens mesh (3) is set according to the wearer's myopia defocus needs; Read the additional photometric value of the model on the rear surface (6) at the corresponding coordinate position; Based on the preset compensation algorithm, the weighted difference between the basic defocus value and the additional photometric value at the corresponding position of the model on the rear surface (6) is calculated, and the calculated weighted difference is determined as the defocus amount of the microlens unit.

8. The method for manufacturing defocus graduated glasses according to claim 5, characterized in that, The processing data synthesis module (500) generates processing instructions, specifically including: Ray tracing simulation was performed on the model of the front surface (5) and the model of the rear surface (6); The aberrations caused by the front and rear face alignment deviation in the simulation results are compensated and optimized to generate the final optical lens (2) three-dimensional point cloud data; The three-dimensional point cloud data is converted into toolpath code for a freeform surface turning machine.

9. The method for manufacturing defocused graduated glasses according to claim 5, characterized in that, The control processing equipment processes the two surfaces of the optical lens (2) substrate respectively, specifically including: Based on the processing instructions of the front surface (5), the front surface (5) containing the microlens mesh (3) is formed by mold casting or cutting process. The rear surface (6) of the optical lens (2) is cut using a freeform surface turning machine according to the machining instructions generated by the model of the rear surface (6), and then flexible polishing is performed after the cutting is completed.

10. The method for manufacturing defocused graduated glasses according to claim 5, characterized in that, When constructing the model of the rear surface (6), the freeform surface construction module (200) calculates the inward shift of the progressive channel toward the nasal side based on the near photometric addition and monocular interpupillary distance obtained by the parameter acquisition module (100), so that the progressive channel trajectory on the model of the rear surface (6) is aligned with the center trajectory of the clear surface (4) on the model of the front surface (5) in the optical axis direction.

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