36 results about "Visual axis" patented technology

The present application relates to the field of processing measurement technology, and more particularly to a kind of automatic measurement method and system for engine box class part machining aperture.The method includes the following steps: obtaining original aperture image;Using local gradient sliding window to locate initial edge point set, determining the tilt angle of viewing axis and the deflection azimuth angle of major axis based on fitting method, to realize the independent separation of the two;Using the deflection azimuth angle of major axis to construct rotation relationship to obtain spindle alignment point set;Using the tilt angle of viewing axis to carry out projection transformation to obtain orthogonal projection point set;Based on the tilt angle of viewing axis, determine the local object distance drift of each edge pixel point, and then determine the non-uniform magnification correction gain, carry out numerical compensation restoration on orthogonal projection point set, to obtain the final machining aperture size;Output compensation signal to drive machine tool compensation actuator to adjust tool offset value.The present application solves the non-uniform magnification distortion problem caused by probe rod droop, and realizes the true value restoration of space light field.

The application provides a high-precision calibration method, device and equipment for mapping camera interior orientation elements and a storage medium. The method comprises the following steps: firstly, using a collimator and an electronic theodolite to independently calibrate the rotary table angle positioning error and the parallel light tube optical axis pointing deviation, respectively, to generate an error correction model and a space angle matrix, and converting the device system error into a known quantity that can be compensated; secondly, using a positive and negative mirror center-finding method to iteratively converge to determine the accurate intersection point of the sight axis and the target surface as the main point initial observation value and the sight axis reference angle, and eliminating the uncertainty of the main point; finally, starting from the reference angle to perform full field scanning and collection, and jointly substituting the corrected angle data, the angle matrix and the main point observation value into the collinearity condition equation for overall adjustment solution, so that the interior orientation elements and the distortion parameters purely reflecting the characteristics of the camera itself are solved under the premise that various system errors have been stripped one by one.

The application discloses a wireless intelligent iris system, which comprises a controller and an electronic corneal contact lens located on the visual axis, and the controller is wirelessly connected with the electronic corneal contact lens. The controller comprises a light intensity sensor, a microprocessor and a wireless energy emission module. The electronic corneal contact lens comprises a wireless energy receiving module, a ring-shaped transparency adjustable diaphragm and a corneal contact lens front base and back base for encapsulating the wireless energy receiving module and the transparency adjustable diaphragm. The light intensity sensor on the controller converts the environmental light intensity into an electric signal and transmits the electric signal to the microprocessor. The microprocessor controls the electric energy to act on the specific diaphragm through the wireless energy emission module and the wireless energy receiving module on the electronic corneal contact lens, thereby independently controlling the visible light transmittance of each layer of diaphragm. When the transparency of the diaphragm gradually changes and expands from the inner circle to the outer circle, the light entering the eye can be adjusted, thereby improving the vision and visual comfort.

The application provides a star-ground laser communication scanning method and system based on a flywheel and a thruster, determines a straight line segment scanning direction of a laser visual axis ground track, determines a distance between adjacent straight line segments, a linear velocity of the straight line segment scanning, and a length and a width of an effective scanning inscribed rectangle of a laser spot, starts from a first straight line segment, traverses each straight line segment, and determines a start point position and an end point position of the straight line segment, according to the end point position of the straight line segment and a start point position of an adjacent next straight line segment, with the maximum acceleration provided by a satellite rolling axis, a pitching axis flywheel and a thruster as a constraint, and according to maximum acceleration and deceleration motion, designs a curve scanning segment track.

The application discloses a single-probe compound-axis tracking method based on two-stage unloading and feedforward, and belongs to the technical field of laser communication.The method is based on the collaborative control of two-stage unloading and inverse model feedforward, and under the premise that the coarse-fine gazing-axis coordinate relationship does not need to be accurately modeled, the dynamic coordination and control decoupling between the coarse-fine gazing axes are realized, the closed-loop instability problem caused by the saturation of the fine stage can be effectively relieved, and a feasible control solution is provided for realizing a lightweight, high-performance free-space laser communication platform.

Aiming glasses can be used for finding a line of aim when shooting firearms and pneumatic weapons, as well as in archery, billiards, golf, and curling. The aiming glasses include an optical part in which aiming guides can be moved and rotated relative to a frame in order to align the center of the guides with the visual axis of the eye, which passes through the center of the fovea and the target, and to vertically orient the guides. The results are improved at aiming accuracy and greater versatility of the aiming glasses for use in different types of sport. A further technical result is that of enabling a sportsperson to cultivate a reproducible afterimage of the aiming guides at the start of a line of aim.

The application provides a hydrogen leakage detection device and method combining mid-infrared imaging and laser absorption spectroscopy, wherein: a TDLAS light source emits wavelength-modulated near-infrared laser; a dichroic mirror reflects the laser to a target area along a coaxial light path, simultaneously reflects a return signal and transmits mid-infrared radiation; a fine-tuning prism adjusts the direction of the mid-infrared radiation during calibration to establish a reference visual axis; an infrared imaging detection module receives the radiation for imaging; a laser return detection module receives the return and converts it into an electrical signal; a four-quadrant detector extracts a bypass light spot to generate optical axis deviation information; and an information processing module denoises and inverts the hydrogen concentration, and corrects the dichroic mirror according to the deviation information to ensure that the laser telemetry and the infrared imaging light path are collinear. The application solves at least one of the technical problems that the laser telemetry and the infrared imaging light path are inconsistent in the existing hydrogen leakage detection scheme, resulting in a mismatch between the detection path and the imaging area, and a lack of real-time monitoring and correction mechanism for optical axis deviation.

The application discloses a kind of anti stray light interference fast mirror stable control method, it is related to photoelectric tracking control technical field, for generating visual axis stable control instruction, including constructing extended state space model containing total disturbance, obtaining deflection angle measurement value, executing the time update of model auxiliary extended state observer, calculate prior state estimation value and prior covariance matrix, utilize deflection angle measurement value, prior state estimation value and prior covariance matrix calculate predicted innovation and its Markov distance, Markov distance mean value is used as input, utilize the exponential decay model with dead zone to calculate the adaptive degree of freedom of student's distribution, measurement noise is modeled as student's distribution controlled by adaptive degree of freedom, construct hierarchical measurement noise model, execute variation bayes iteration, output optimal extended state estimation value and introduce control loop, generate visual axis stable control instruction and drive actuator.The application can improve the high-precision visual axis stability and robustness of fast mirror.

The present disclosure provides a system for optical detection of an eye, comprising: a light emitting assembly configured to form an incident light ray array comprising a plurality of incident light rays parallel to a chief ray; a half mirror configured to reflect the incident light ray array at an angle to an optical axis of the system for forming a plurality of chief rays parallel to the optical axis of the system; a first objective lens having an optical axis coinciding with the optical axis of the system for converging the plurality of chief rays formed via the half mirror reflection onto a pupil plane of a measured eye so as to form a spot array on a retina of the measured eye; and a photodetector configured to acquire a spot array image corresponding to the spot array for detecting optical performance of the retina of the measured eye. The present disclosure can simultaneously measure optical imaging quality of a central field of view of the retina along an optical axis direction and optical imaging quality of a peripheral field of view of the retina to achieve fast detection of optical quality of the eye for a wide field of view on and off the optical axis.

The present application relates to a kind of six degrees of freedom measurement systems, it includes camera;Prism, optical axis is coaxially arranged with camera view axis;Target, be set in the combined field of view of camera and prism and be installed on the target to be measured;The target includes shell, longitudinal drive assembly is installed in shell, guide rod and the mounting seat slidingly connected with guide rod;Through nut is also installed on the top plate of the shell, and the screw rod is connected with the nut inner thread cooperation connection, nut is connected with longitudinal drive assembly;The screw rod one end is connected with mounting seat, the other end is connected with the top plate on transverse drive assembly and passes through transverse drive assembly;Multiple struts are equipped on the transverse drive assembly, and transverse drive assembly drives struts simultaneously close or far away;The top of the screw rod and struts are all installed with mark point.Compared with prior art, the target of the present application can be independently adjusted configuration space, change the distribution of mark point in space, adapt to the measurement scene of space limited.

This invention relates to the field of optoelectronic payload imaging control technology, specifically providing an adaptive continuously variable gain target tracking control method and system for optoelectronic payloads. The method includes: acquiring an image of the tracked target; calculating the miss distance between the tracked target and the image center; calculating the error angle using the miss distance; constructing a nonlinear continuously variable gain function using the miss distance, wherein the nonlinear continuously variable gain function is a globally continuous, differentiable, and piecewise-free odd function, and the odd function includes a constant gain coefficient and a smoothing constant coefficient; and generating a control signal using the nonlinear continuously variable gain function, which is used to drive a motor to move the line of sight. This invention constructs a nonlinear continuously variable gain function with the image miss distance as the input variable, dynamically mapping the miss distance to real-time gain parameters, thereby achieving closed-loop adaptive gain adjustment of the optoelectronic payload frame.

The application discloses a boresight dwell accuracy verification system and method for step-by-step gaze imaging, and belongs to the technical field of photoelectric measurement. The verification method comprises the following steps: step 1, constructing a multi-source external optical verification link; step 2, controlling the measured step-by-step gaze imaging device to be in a static state, driving a fast reflecting mirror and a scanning mirror to input a known curve excitation, collecting spot centroid displacement by using a high-speed measurement camera, and establishing a static calibration coefficient of spot centroid pixel displacement and actual boresight deflection angle; step 3, synchronous interception of a dwell window time sequence; step 4, high-frequency transient angle time sequence solving; step 5, calculating the root mean square value and the peak-to-peak value of a two-dimensional time sequence of angle deviation in the dwell window time, judging whether a sub-micro-radian level dwell accuracy threshold is met or not, and switching a resolution target, performing MTF calculation based on an infrared camera to extract a target image, and realizing cross verification of a time domain trajectory and a frequency domain imaging quality.

A kind of self-adapting optical axis visual axis consistency correction method, comprising: first, the angle between camera coordinate system and laser coordinate system is calibrated, image visual axis is adjusted parallel with guide rail axis using standard long straight line guide rail, the plane target of vertical guide rail is controlled to move on straight line guide rail, image is shot at the nearest working distance and the farthest working distance position, the distance value at two positions is recorded, the pixel coordinates of laser point in image are obtained by image processing, and the spatial coordinates of two light points under camera coordinate system are calculated according to the camera imaging model by the focal length, pixel size parameter of camera, the straight line equation of laser axis is established under camera coordinate system;Then, according to the distance obtained by laser ranging, the actual focal length of camera, pixel size, the pixel coordinates of laser light point deviating from image center at current position are solved using laser axis straight line equation, the original image is sheared and displayed by taking laser point pixel coordinates as center, and the real-time correction of visual axis is realized.

An anti-interference line-of-sight stabilization control method for dynamic target tracking belongs to the field of visual servoing and photoelectric tracking technology. This invention addresses the problem that existing line-of-sight stabilization systems cannot effectively handle time-varying and unknown target maneuvers. It includes: mounting a camera on the line-of-sight stabilization device to acquire target images and obtain the image miss distance; using a UDE-based outer-loop programmable logic controller to obtain an interference estimation signal; using an MPC-based outer-loop visual servo controller to calculate the outer-loop control signal; a UDE-based inner-loop attitude controller to obtain a control signal for the line-of-sight stabilization device based on the outer-loop control signal and the current attitude of the line-of-sight stabilization device; and the actuator of the line-of-sight stabilization device adjusting its attitude according to the control signal, ensuring that the image miss distance of the target position coordinates in the target image is within a set threshold. This invention is applicable to scenarios such as UAV monitoring, UAV countermeasures, and low-altitude security.

This invention relates to a six-degree-of-freedom (6DOF) measurement system and method. The 6DOF measurement system includes a camera, a prism, and a target; the optical axis of the prism is coaxial with the line of sight of the camera; the target is mounted on the target and positioned within the combined field of view of the camera and prism; the target includes a mounting base and a main shaft mounted on the mounting base, with a fixing plate on the main shaft; an annular sleeve is fixedly connected to the fixing plate, and a motor is mounted outside the annular sleeve; the main shaft of the motor passes through the annular sleeve and is connected to a transmission component, which has rollers connected to a slider. Driven by the motor, the slider can slide radially from the center to the edge of the annular sleeve via the rollers; a main marker is mounted on the top of the main shaft, and an auxiliary marker is mounted on the top of the slider. Compared with the prior art, this invention can achieve six-degree-of-freedom pose measurement of a target under uncalibrated conditions, improving the adaptability of the measurement system.

The application relates to the field of remote sensing image processing, and discloses a compensation processing method, device and equipment for multi-band remote sensing images, wherein the method comprises the following steps: acquiring initial remote sensing images of multiple bands; performing fixed difference processing on the initial remote sensing images to obtain first remote sensing images of multiple different bands; determining a first remote sensing image pair formed by any two first remote sensing images; performing sub-pixel level registration on the first remote sensing image pair; determining a relative displacement curve of the first remote sensing image pair based on the registration result; performing frequency spectrum analysis on the relative displacement curve; determining a main frequency component of an optical axis jitter based on the analysis result; determining an optical axis jitter model based on the main frequency component; and performing geometric compensation on the first remote sensing images according to the optical axis jitter model to obtain multiple second remote sensing images after compensation. The technical scheme provided by the application can realize accurate compensation of optical axis jitter of remote sensing images, thereby improving the imaging quality of the remote sensing images.

The application discloses a two-dimensional galvanometer visual axis pointing coupling correction method, and mainly solves the problem that the visual axis pointing error calculated by the prior art is in the order of milliradians, and it is difficult to meet the high-precision correction requirement.The method comprises the following steps: step 1, establishing a visual axis pointing model for a two-dimensional galvanometer to be corrected; step 2, acquiring a linear model between the rotation angle of the two-dimensional galvanometer and the visual axis pointing angle of a two-stage stable pointing system based on the visual axis pointing model by using a linear approximation method; acquiring a pointing error based on the visual axis pointing model and the linear model; performing nonlinear correction on the pointing error by using a Volterra series to acquire a nonlinear correction relationship; step 3, acquiring a corrected pointing error by using the nonlinear correction relationship; and step 4, acquiring the control angle of the two-dimensional galvanometer based on the corrected pointing error.The application can reduce the visual axis pointing error from the order of milliradians to the order of microradians, the pointing calculation precision is improved by about 75 times, and the visual axis pointing calculation precision is significantly improved.

This invention relates to a dual-wedge scanner calibration system and method based on the principle of directional decoupling. The system comprises a dual-wedge scanner, an imaging detector, a target, and a reference screen. The implementation method includes assembling the calibration system, adjusting the imaging line of sight pitch, adjusting the imaging line of sight azimuth, and calibrating the dual-wedge rotation angle error. Compared with existing technologies, this invention detects the optical pointing error of the dual-wedge scanner by combining the imaging detector and the target. Simultaneously, it utilizes the optical scanning characteristics of the dual-wedge scanner to establish a decoupled adjustment strategy for pitch and azimuth, transforming the dual-wedge calibration problem into an imaging line of sight pointing adjustment problem. This allows for large-scale, high-precision calibration of the dual-wedge main cross-section position using a simple and compact system composition and flexible and efficient implementation methods, providing technical support for the application of dual-wedge scanners.

The invention relates to the technical field of virtual reality processing software, and discloses a hierarchical loading and rendering method for three-dimensional geographic space data, which comprises the following steps: extracting a displacement vector and a rotation deflection amount of a virtual camera, calculating a weight sensitive field angle according to the displacement vector and the rotation deflection amount, and constructing a rendering weight distribution area in a view cone, the method comprises the following steps: determining a rendering loading weight according to a deviation angle of a geographic entity node relative to a visual axis, distributing an asynchronous scheduling queue by utilizing the rendering loading weight, matching detail levels, monitoring time consumption of a rendering pipeline frame in real time, executing grading and degrading processing when the time consumption exceeds a threshold value, and calling a rendering shader to execute linear interpolation. According to the method, resource allocation is dynamically adjusted according to viewpoint motion features, the problem of data loading lag in high-dynamic interaction is solved, continuous details of a visual center area are guaranteed through a weight-sensitive closed-loop degradation mechanism, geometric jump is eliminated, and the rendering stability of a three-dimensional geographic scene is improved.

An optical system is capable observing a peripheral field away from a visual axis and includes a reflection mirror unit forming an image of an examined eye with two concave mirrors in an opposing arrangement facing each other at the examined eye side, this being the upstream side, of a first optical unit and a second optical unit. In the reflection unit there is a conjugate relationship between one focal point thereof and another focal point thereof. By forming an image of the examined eye using the reflection unit a distance can be secured between the examined eye and the optical system and a wide range of the examined eye can be observed.

The application discloses an automatic center positioning and eyeball rotation compensation control system, method and equipment for femtosecond laser refractive surgery, and relates to the field of ophthalmic surgery equipment. The system comprises an image acquisition module, an image processing module, a motion control module, a negative pressure control module and a central processing module. The preoperative sitting visual axis deviation, iris texture and pupil diameter reference value are collected. The light is automatically adjusted during the operation to make the pupil diameter consistent with the pupil diameter reference value, thereby realizing high-precision automatic alignment. After the negative pressure suction ring physically contacts the cornea, the negative pressure is started to ensure stable sealing. After the negative pressure suction, the eyeball rotation angle is automatically calculated through iris feature matching, and the cutting model axis position is adjusted. The application realizes full-process automation, solves the problems of manual operation, large error and low efficiency in the prior art, and significantly improves the visual axis positioning accuracy and surgical safety through active control of physiological conditions (pupil diameter) and strict physical contact logic.

A workpiece processing apparatus for machining and / or manufacturing workpiece edges on a plate-shaped workpiece includes a detection device controlled by a control and adjustment mechanism for automatically detecting at least one characteristic of the workpiece edge. The detection device has an image detection device, wherein the viewing axis of the image detection device is oriented in the region of the workpiece edge toward the area to be detected on the workpiece edge and is positioned at least substantially orthogonal to the plane of the plate-shaped workpiece.

This invention discloses a method and system for stabilizing the line-of-sight pointing of a space telescope. The method includes: acquiring the low-frequency attitude quaternions and high-frequency attitude angular velocities of the satellite; performing delay compensation on the low-frequency attitude quaternions; fusing the compensated attitude quaternions with the high-frequency attitude angular velocities using a data fusion algorithm to generate a high-frequency satellite attitude quaternion sequence consistent with the sampling rate of the servo control system; calculating the attitude transformation matrix based on this sequence; projecting the inertial frame pointing vector sequence between the target and the satellite position sequentially onto the satellite body coordinate system and the telescope base coordinate system to obtain a pointing vector sequence in the telescope base coordinate system; calculating the desired pointing angle of the telescope based on this sequence; and controlling the telescope to rotate so that the line-of-sight points towards the target. This invention solves the problems of insufficient pointing accuracy caused by low satellite attitude data sampling rate and delay in existing guidance pointing methods, effectively improving the line-of-sight pointing accuracy and stability of space telescopes.

This application provides a method for rapidly eliminating ciliary muscle tension based on a divergence breakpoint, comprising: S1, setting isolated and independently movable targets for the user's left and right eyes respectively; S2, moving the target corresponding to the left eye from a first initial position to the left and the target corresponding to the right eye from a first initial position to the right, thereby causing the user's visual axes to diverge until the single visual image separates or breaks into diplopia, thus obtaining the current divergence breakpoint; S3, setting a target point within a first preset radius of the current divergence breakpoint, thus obtaining the current target point; and performing a preset ciliary muscle relaxation method on the targets corresponding to the left and right eyes respectively at the current target point to relax the user's ciliary muscles until a preset stopping condition is met. The solution of this application can achieve the purpose of ciliary muscle relaxation without medication, thus solving the problem that relieving ciliary muscle tension through drugs can affect bodily functions.

The application provides a variable-resolution dynamic scanning optical remote sensing imaging information flux evaluation method, and belongs to the technical field of space remote sensing. Firstly, for the variable-resolution dynamic scanning remote sensing system to be evaluated, a strict geometric projection relationship between an optical remote sensing camera visual axis and a spatial resolution is established, and a ground pixel resolution model is established; a spatial sampling density function is defined, integral operation is performed on the spatial sampling density function in a full-width range, and total effective pixel quantity in the full-width range is obtained; an equivalent information flux model is constructed to realize equivalent comparison of different systems; finally, an information flux envelope diagram is visualized for intuitive evaluation; through construction of the spatial sampling density integral model and the information quantity factor, accurate measurement and evaluation of the equivalent information quantity of the full-width system are realized, and meanwhile, a quantitative comparison index of equivalent information of the variable-resolution dynamic scanning system and the traditional constant-resolution push-broom system is provided.

This application provides a method for calibrating user parameters for regional eye tracking, including: acquiring a calibration eye map of each calibration point; determining the calibration pupil features and calibration spot features of each calibration point; calculating the calibration corneal curvature radius and calibration corneal curvature center of each calibration point based on the calibration pupil features and calibration spot features; determining the calibration optical axis direction and the distance from the calibration pupil center to the calibration corneal curvature center of each calibration point based on the calibration corneal curvature center and calibration pupil center of each calibration point; calculating the angle between the calibration optical axis direction and the calibration visual axis direction of each calibration point; acquiring an actual eye map, and calculating the actual visual axis direction of the actual eye map based on the angle and the actual optical axis direction of the actual eye map. By performing regional calibration on each calibration point, the accuracy and precision of eye tracking are improved.

This invention discloses an eye-tracking method and system based on dynamic trajectory calibration, comprising: performing pupil detection using an adaptive dual-mode pupil detection method, acquiring pupil ellipse parameters from multiple frames of eye images; based on the pupil ellipse parameters, acquiring multiple frames of pupil observation data for estimating the eyeball center, estimating the eyeball center, and calculating the eyeball radius, thereby establishing an eyeball model; implementing a calibration process, acquiring calibration data pairs formed by the visual axis direction of the human eye and the coordinates of calibration points, and using an intelligent data cleaning algorithm to clean the calibration data pairs, establishing a mapping model from the visual axis direction to the screen coordinates; based on the established eyeball model and the calibrated mapping model, during the continuous operation phase of eye tracking, based on the results of real-time pupil detection and real-time gaze direction, obtaining binocular fused gaze points through multi-sensor fusion estimation, and outputting a gaze point sequence after smoothing.

Frame for supporting a head-mounted display on a user, comprising: a first portion positioned for a first user's eye, comprising: a first casing for optical components, the first casing comprising: a first casing reflector mount for a first casing reflector; a first back mount for a back reflector, the back mount defining a plane for the back reflector and a corresponding back reflector axis perpendicular to the plane; a first front mount for a combiner, the front mount defining a plane for the combiner and a corresponding combiner axis perpendicular to the plane; the back mount positioned to position the back reflector in close proximity to the user's first eyebrow; the casing comprising: a second portion positioned for the other eye, comprising: a second casing for a second optical component, the second casing comprising: a second casing reflector mount for a second casing reflector; and A second back mount for the back reflector, the back mount defining a plane for the back reflector and a corresponding back reflector perpendicular to the plane; a second front mount for the second combiner for the other eye, the front mount defining a plane for the combiner and a corresponding combiner axis perpendicular to the plane; the second back mount is positioned to position the second back reflector close to the user's other eyebrow, and as a result the second casing extends from the inner end close to the other eyebrow. A frame is disclosed comprising: a second portion having an outer end adjacent to the other temple of the ser; a bridge member having an extension between the first casing and the second casing, thereby defining a frame transverse axis, and being positioned to be mounted substantially parallel to the user's cross-section; the frame transverse axis having an X-axis perpendicular thereto for alignment with the user's forward-looking axis when mounted, and each of the back mounts and each of the front mounts extending downward from the bridge member.

This invention relates to the field of behavioral feature recognition technology and discloses a gaze estimation method that integrates binocular geometric features. The method includes: acquiring a face image; extracting multi-scale binocular geometric feature tensors through a geometric prior network; calculating the absolute value of the element-wise differences between the geometric feature tensors to generate a residual feature map; mapping the residual feature map to dynamic affine transformation parameters; performing spatial resampling and coordinate alignment on the eye geometric feature tensors according to the dynamic affine transformation parameters to generate a joint geometric feature tensor; and performing cross-attention semantic fusion with the appearance feature tensor to determine the three-dimensional gaze direction. This invention compensates for the binocular visual axis non-parallelism caused by near-field fixation by calculating feature offset residuals and performing dynamic affine calibration. Without increasing the sensing hardware, it enhances the system's stability against illumination interference and local occlusion by utilizing structured priors, thereby improving the robustness of gaze estimation in complex interactive scenarios.

The application is a method for designing myopia prevention and control contact lenses based on a modulation transfer function area distribution method, and belongs to the technical field of optical design. The application first confirms the setting of basic parameters of the contact lenses; then adds aspherical surface coefficients to optimize the imaging quality of each area; then brings in the modulation transfer function area distribution method to obtain the area of each ring; through confirming whether the imaging quality of each area is equal, if not, repeat the previous step; finally, the myopia prevention and control contact lenses based on the modulation transfer function area distribution method with equal imaging quality of each area are obtained. The area distribution method of the modulation transfer function is combined to divide the proportion of the defocus area and the correction area of the myopia prevention and control area, so as to balance the myopia prevention and control effect and the imaging quality. The defocus soft corneal contact lens changes the health state of the visual axis by designing different refractive correction degrees in different areas and focusing part of the light in front of the retina, so as to play a role in preventing and controlling myopia.