Intelligent zoom glasses based on visual feedback mechanism

Abstract

The invention relates to the technical field of zoom glasses, and discloses a pair of intelligent zoom glasses based on a visual feedback mechanism, which comprises a glasses frame, lenses and an electronic element comprising a light sensor, an eye movement tracking sensor, a control unit and a power supply module, compared with traditional single-focal-length glasses, the glasses can cope with complex eye using scenes, for example, when different illumination rooms are switched, the focal length can be automatically adjusted, eye fatigue can be relieved, and clear vision can be guaranteed; compared with an existing glasses product, the glasses deeply integrates eye movement tracking and light sensing technologies, synergistically exerts advantages, and accurately serves vision correction optimization; the defects that most zoom glasses are not accurate in adjustment and slow in response are overcome, and accurate focusing is achieved by integrating light and eyeball focusing directions; and a protection mechanism and a self-adaptive strategy are set according to strong light and weak light, so that the visual comfort of a user is guaranteed in an all-around manner, and multiple eye using requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of zoom glasses, and in particular to a pair of smart zoom glasses based on a visual feedback mechanism. Background Art

[0002] Traditional glasses usually only have a single fixed focal length, which is difficult to meet people's visual needs in various dynamic eye use situations. For example, when people suddenly walk from a bright indoor environment to a dark room to read a book, fixed-focus glasses cannot automatically adjust the focal length to adapt to the visual differences caused by the change in light, which can easily lead to eye fatigue and blurred vision.

[0003] With the continuous advancement of science and technology, visual assistance technology has become a research hotspot. Eye tracking technology has been widely used in fields such as virtual reality and augmented reality to accurately capture the user's visual focus and enhance the interactive experience. Light sensing technology is also used on many smart devices to achieve intelligent monitoring and control of ambient light. However, existing eyewear products rarely deeply integrate these two key technologies, and fail to give full play to their synergistic advantages to serve daily vision correction and optimization.

[0004] In addition, although there are some glasses with zoom functions on the market, most of them have problems such as inaccurate adjustment and slow response speed. Some zoom glasses only adjust the focal length based on simple changes in light intensity, ignoring the matching relationship between the eye's own focusing direction and the light direction, resulting in poor actual visual effects. Moreover, this type of glasses lacks effective protection mechanisms and adaptive strategies when facing extreme lighting conditions such as strong light and weak light. Not only can it not guarantee the user's visual comfort, it may even cause damage to the eyes.

[0005] To sum up, in order to solve the many shortcomings of traditional glasses and existing varifocal glasses and meet people's growing complex eye needs, it is urgent to develop a new type of smart varifocal glasses that can intelligently, quickly and accurately adjust the focal length based on precise visual feedback mechanism and adapt to a variety of lighting environments. Summary of the invention

[0006] The purpose of the present invention is to provide a smart zoom glasses based on a visual feedback mechanism, which solves the technical problems raised in the background technology.

[0007] The purpose of the present invention can be achieved through the following technical solutions: A smart zoom glasses based on a visual feedback mechanism, comprising: a glasses frame, lenses, and electronic components including a light sensor, an eye tracking sensor, a control unit and a power module; Among them, the frame of the glasses is used to support the lenses and the built-in electronic components; The lens is made of an optical zoom material that changes its focal length through an external control signal, wherein the optical zoom material is a liquid crystal material; The light sensors are installed on both sides of the glasses frame. The light sensors are used to detect the intensity and direction of light entering the eyes and obtain the light intensity parameter and light direction vector. The light intensity parameter is marked as L, and the light direction vector is marked as V = (v x , v y , v z ); The eye tracking sensor is installed on the inside of the glasses frame. The eye tracking sensor is used to track the rotation and focus direction of the eyeball, and obtain the eyeball rotation angle and focus direction vector; then the eyeball rotation angle is marked as G, and the focus direction vector is marked as U = (u x ,u y ,u z ); The control unit is embedded in the frame of the glasses, and is used to receive data measured by the light sensor and the eye tracking sensor, and then perform focus adjustment control according to the data; The power module is embedded inside the glasses frame and is used to provide power to the light sensor, eye tracking sensor, and control unit.

[0008] As a further solution of the present invention: wherein the light sensor includes a microlens array and a detector array, the light direction vector is obtained as follows: The microlens array focuses light incident at different angles onto different positions of the detector array. When light is incident, the detectors at different positions will generate corresponding electrical signals according to the intensity of the received light. Subsequently, by analyzing the responses of these detectors, the intensity distribution of the light on the detector array can be determined; Then, based on the information such as the center of gravity of the light intensity distribution and the geometric parameters and optical structure of the detector array, the projection vector of the light direction on the detector array plane is calculated; Then, by using triangulation and other methods using light sensors at multiple different locations, the light direction vector in three-dimensional space can be further obtained.

[0009] As a further solution of the present invention: the focusing direction vector is obtained as follows: Eye tracking sensors use the principle of infrared light reflection to monitor eye movement; First, the eye tracking sensor determines the rotation angle of the eyeball by emitting infrared light and detecting the position change of the reflected light on the surface of the eyeball; Then, combining the physiological optical model of the eyeball and the known structural parameters of the eyeball, the rotation angle of the eyeball is converted into a focusing direction vector; specifically, the vector of the focusing direction in three-dimensional space is calculated by the principle of geometric optics based on the optical center position of the eyeball, the curvature of the cornea and lens, and the angle of eyeball rotation; As a further solution of the present invention: the focal length adjustment control method is as follows: Step K1, calculate the deviation between the light direction vector and the eye focus direction vector; The calculation formula is: ; The specific calculation process is as follows: First, perform vector subtraction on V and U and obtain a new vector W = VU; Then extract the components corresponding to vector V and vector U respectively (v x , v y , v z ) and (u x ,u y ,u z ); Then through: ; Calculate the modulus of W; Then pass: ; Get the deviation D between the light direction vector and the eye focus direction vector; Step K2, determine whether the lens focal length needs to be adjusted according to the deviation D and the light intensity L; Compare the deviation D and the light intensity L with their corresponding preset deviation threshold Dy and preset intensity threshold interval [Lmin, Lmax] respectively: Among them, Lmin is the lower limit of the intensity threshold, and Lmax is the upper limit of the intensity threshold; If D≥Dy and L∈[Lmin,Lmax], it is determined that the user's visual focus does not match the direction of the external light, and the lens focal length needs to be adjusted, and a lens focal length adjustment signal is generated; Step K3, when the lens focus adjustment signal is generated, an electrical signal is sent to the lens to adjust the lens focus; The method is as follows: Step K3.1, extract the initial focal length of the lens and mark it as J0; Step K3.2, through: ; Calculate the electrical signal strength E; Wherein, β is a preset proportionality coefficient, which is obtained by pre-testing the optical properties of the lens material and the overall performance of the glasses; Step K3.3, through: ; Calculate the adjustment amount of the lens focal length; Where γ is the focal length-electrical signal ratio coefficient determined by the optical properties of the lens material; Step K3.4, through: ; Calculate the adjusted lens focal length J1; Then the control unit controls the focal length adjustment mechanism of the lens to adjust the focal length of the lens according to the adjusted focal length J1 of the lens; As a further solution of the present invention: the eyeglass frame is also equipped with a focus adjustment mechanism corresponding to the lens, the focus adjustment mechanism is connected to the control unit, and it responds to the electrical signal sent by the control unit to adjust the focus of the lens; Among them, the power module provides power for the focus adjustment mechanism.

[0010] As a further solution of the present invention: wherein the power module adopts a rechargeable lithium battery.

[0011] As a further solution of the present invention: if D<Dy and L∈[Lmin,Lmax], it is determined that the user's visual focus matches the direction of the external light. At this time, there is no need to adjust the lens focal length, and no lens focal length adjustment signal is generated.

[0012] As a further solution of the present invention: when L>Lmax, the function of adjusting the focus according to D is temporarily stopped, because under such strong light interference, it may cause damage to the eyes and may exceed the normal working range of the sensor and the lens.

[0013] As a further solution of the present invention: the eyeglass frame is also equipped with an LED lamp, and the LED lamp is powered by a power module; When L<Lmin, a lighting on signal is generated, and the lighting on signal is used to start the LED light through the control unit. After the lighting is improved, it is determined whether the lens focal length needs to be adjusted based on D and the adjusted light intensity; When the LED light is on, when L>2×Lmin, the lighting-on signal is converted into a lighting-off signal.

[0014] Beneficial effects of the present invention: Intelligent adaptation to visual needs: The light intensity and direction are detected by the light sensor, the eye tracking sensor tracks the movement and focusing direction of the eyeball, and the control unit adjusts the focal length based on these data. It can automatically adjust the lens focal length according to the match between the user's actual visual focus and the direction of external light, so that the glasses can intelligently adapt to different visual scenes and needs, providing users with a clear and comfortable visual experience.

[0015] Precise focal length adjustment: It has a rigorous focal length adjustment control method. First, the deviation between the light direction vector and the eye focus direction vector is accurately calculated, and then the light intensity is combined to determine whether the lens focal length needs to be adjusted. When it is determined that adjustment is needed, a scientific and reasonable calculation formula is used to obtain the electrical signal strength, the lens focal length adjustment amount, and the adjusted lens focal length, and then the lens focal length is accurately adjusted to ensure that the visual effect can meet the user's current eye status.

[0016] Multi-scenario applicability: Considering different light intensity scenarios, the intensity threshold range and response strategies for different situations such as strong light and weak light are set. For example, under strong light interference, the function of adjusting the focus according to the deviation is temporarily stopped to prevent strong light from causing damage to the eyes and exceeding the normal working range of the sensor and lens; in weak light, it can generate a lighting start signal to start the LED light to improve lighting, and then determine whether to adjust the lens focus according to the situation, ensuring that the glasses can function normally in a variety of light environments and improving applicability.

[0017] Reasonable and reliable structure: The frame of the glasses not only supports the lenses and built-in electronic components, but is also equipped with a focal length adjustment mechanism connected to the control unit, which can adjust the focal length of the lenses in response to the electrical signals sent by the control unit. The components cooperate with each other and have a reasonable structure. At the same time, the power module uses a rechargeable lithium battery to provide stable and reliable power support for the light sensor, eye tracking sensor, control unit, focal length adjustment mechanism, LED lights, etc., to ensure the overall stable operation of the glasses. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 The system block diagram of the intelligent zoom glasses based on the visual feedback mechanism of the present invention.

[0020] Figure 2 The present invention is a schematic diagram of a focus adjustment control process of a control unit in smart zoom glasses based on a visual feedback mechanism. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1 See also Figure 1 and Figure 2As shown, the present invention is a pair of smart zoom glasses based on a visual feedback mechanism, which are composed of a glasses frame, lenses and electronic components; In this embodiment: the glasses frame is used to support the lenses and the built-in electronic components, and the frame material can be selected from light and strong metal or plastic to ensure wearing comfort and durability; the lenses are made of optical zoom material, which can change its focal length under the action of external control signals; Among them, the optical zoom material adopts liquid crystal material. Liquid crystal molecules have anisotropic optical properties. In the absence of an external electric field, the liquid crystal molecules present a specific arrangement. When an electric field is applied, the orientation of the liquid crystal molecules will change. This change in orientation will cause the refractive index of light to change when it passes through the liquid crystal layer, thereby achieving focal length adjustment. For example, in a liquid crystal zoom lens, the tilt angle of the liquid crystal molecules can be controlled by applying electric fields of different voltages on both sides of the liquid crystal layer. According to liquid crystal optical theory, the change in refractive index is related to the tilt angle of the liquid crystal molecules, which can in turn change the focal length of the lens. The electronic components include a light sensor, an eye tracking sensor, a control unit, and a power module; In this embodiment, the light sensor is any one of BH1750 and TSL2561. BH1750 adopts I2C bus communication protocol and is easy to connect to the microcontroller. It supports a wide range of illumination from 0 to 65535 lux, and can be configured with different resolutions and sampling rates to adapt to a variety of application scenarios. It has a low power consumption mode and is suitable for battery-powered applications. It is widely used in security systems, smart homes, automotive electronics and other fields. TSL2561: is a high-speed, low-power, wide-range digital light intensity sensor that can directly convert light intensity into digital signal output. It has multiple measurement modes and programmable functions. It can communicate with the microcontroller through the I2C bus and is often used in applications such as ambient light detection and automatic brightness adjustment. The eye tracking sensor model used is either OVM7251 or OG0TCBSI. OVM7251 is an image sensor based on the 3-micron OmniPixel3-GS global shutter architecture launched by OmniVision. It provides a camera module with a 640×480 VGA resolution. It has the characteristics of small size, low power consumption and high cost performance, and is suitable for AR / VR eye tracking, facial recognition and other applications. OG0TCBSI is the latest 2.2-micron global shutter image sensor released by OmniVision, which is specially used for eye tracking and facial tracking in AR / VR / MR consumer-grade head displays and glasses. The power consumption is reduced by more than 40% compared with the previous generation, and the package size is only 1.64mmx1.64mm. It adopts PureCelPlus-S stacked chip technology and DCG high dynamic range technology to provide 400x400 resolution. The light sensors are installed on both sides of the glasses frame. The light sensors are used to detect the intensity and direction of light entering the eyes and obtain the light intensity parameter and light direction vector. The light intensity parameter is marked as L, and the light direction vector is marked as V = (v x , v y , v z ); Among them, the light sensor is an existing technology, so it will not be described in detail; The light sensor contains a microlens array and a detector array, and the light direction vector is obtained as follows: The microlens array focuses light incident at different angles onto different positions of the detector array. When light is incident, the detectors at different positions will generate corresponding electrical signals according to the intensity of the received light. Subsequently, by analyzing the responses of these detectors, the intensity distribution of the light on the detector array can be determined; Then, based on the information such as the center of gravity of the light intensity distribution and the geometric parameters and optical structure of the detector array, the projection vector of the light direction on the detector array plane is calculated; Then, the light direction vector in three-dimensional space is further obtained by using triangulation and other methods through light sensors at different positions; The eye tracking sensor is installed on the inside of the glasses frame, close to the eyes. It is used to track the rotation and focus direction of the eyeball, and obtain the eyeball rotation angle and focus direction vector; then the eyeball rotation angle is marked as G, and the focus direction vector is marked as U = (u x ,u y ,u z ); The focus direction vector is derived as follows: Eye tracking sensors use the principle of infrared light reflection to monitor eye movement; First, the eye tracking sensor determines the rotation angle of the eyeball by emitting infrared light and detecting the position change of the reflected light on the surface of the eyeball; Then, the eyeball's rotation angle is converted into a focusing direction vector by combining the eyeball's physiological optical model and known eyeball structural parameters; for example, the focusing direction vector in three-dimensional space is calculated by the principle of geometric optics based on the position of the eyeball's optical center, the curvature of the cornea and lens, and the eyeball's rotation angle; In this embodiment, the methods of obtaining the light direction vector and the focus direction vector are supported by existing technologies, so they are not described in detail. The control unit is embedded in the frame of the glasses, and is used to receive data measured by the light sensor and the eye tracking sensor, and then perform focus adjustment control according to the data; The focus adjustment control method is as follows: Step K1, calculate the deviation between the light direction vector and the eye focus direction vector; The calculation formula is: ; The specific calculation process is as follows: First, perform vector subtraction on V and U and obtain a new vector W = VU; Then extract the components corresponding to vector V and vector U respectively (v x , v y , v z ) and (u x ,u y ,u z ); Then through: ; Calculate the modulus of W; Then pass: ; Get the deviation D between the light direction vector and the eye focus direction vector; Step K2, determine whether the lens focal length needs to be adjusted according to the deviation D and the light intensity L; Compare the deviation D and the light intensity L with their corresponding preset deviation threshold Dy and preset intensity threshold interval [Lmin, Lmax] respectively: Among them, Lmin is the lower limit of the intensity threshold, and Lmax is the upper limit of the intensity threshold; If D≥Dy and L∈[Lmin,Lmax], it is determined that the user's visual focus does not match the direction of the external light, and the lens focal length needs to be adjusted, and a lens focal length adjustment signal is generated; If D<Dy and L∈[Lmin,Lmax], it is determined that the user's visual focus is relatively matched with the direction of the external light. At this time, there is no need to adjust the lens focal length, and no lens focal length adjustment signal is generated; Step K3, when the lens focus adjustment signal is generated, an electrical signal is sent to the lens to adjust the lens focus; The method is as follows: Step K3.1, extract the initial focal length of the lens and mark it as J0; Step K3.2, through: ; Calculate the electrical signal strength E; Wherein, β is a preset proportionality coefficient, which is obtained by pre-testing the optical properties of the lens material and the overall performance of the glasses; In this embodiment, D is in degrees and β is in volts per degree; Step K3.3, through: ; Calculate the adjustment amount of the lens focal length; Where γ is the focal length-electrical signal ratio coefficient determined by the optical properties of the lens material; Step K3.4, through: ; Calculate the adjusted lens focal length J1; Then the control unit controls the focal length adjustment mechanism of the lens to adjust the focal length of the lens according to the adjusted focal length J1 of the lens; In this embodiment, a focal length adjustment mechanism corresponding to the lens is also provided, and the focal length adjustment mechanism is connected to the control unit, and responds to the electrical signal sent by the control unit to accurately adjust the focal length of the lens to meet the needs of users in different visual scenes; wherein, the focal length adjustment mechanism of the lens uses the electrically controlled birefringence characteristics of the liquid crystal material to adjust the focal length, specifically by applying electric fields of different intensities to change the orientation of the liquid crystal molecules, thereby changing the refractive index of the liquid crystal layer, thereby realizing the control of the refraction of light passing through the liquid crystal lens, and achieving the purpose of adjusting the focal length; The power module is embedded in the frame of the glasses, and is used to provide power to the light sensor, the eye tracking sensor, the control unit and the focus adjustment mechanism of the lens; In this embodiment, the power module uses a rechargeable lithium battery.

[0023] This embodiment uses lightweight and strong metal or plastic as the frame material, which ensures wearing comfort and has good durability, is conducive to long-term use and does not bring excessive burden to the wearer; liquid crystal material is used as the optical zoom material, and the anisotropic optical properties of liquid crystal molecules are used to change the molecular orientation by applying an external electric field, thereby changing the refractive index of light to achieve focal length adjustment. This method enables the lens to flexibly respond to external control signals, achieve variable adjustment of focal length, and adapt to different visual needs; BH1750 or TSL2561 model is selected. BH1750 supports a wide range of illumination, can be configured with different resolutions and sampling rates, and also has a low power consumption mode, which is suitable for a variety of application scenarios and is easy to connect to a microcontroller; TSL2561 can directly convert light intensity into digital signal output, has a variety of measurement modes and programmable functions, and is convenient for accurately detecting the intensity and direction of light entering the eye, providing a reliable basis for subsequent focal length adjustment; OVM7251 or OG0TCBSI model is used, OVM 7251 has the characteristics of small size, low power consumption and high cost performance, and is suitable for applications such as eye tracking; OG0TCBSI has lower power consumption, smaller package size and uses advanced technology, which can accurately track the rotation and focusing direction of the eyeball, providing strong support for accurately judging the user's visual focus; it has a rigorous focus adjustment control process, first accurately calculates the deviation between the light direction vector and the eyeball focusing direction vector, and then determines whether to adjust the lens focal length in combination with the light intensity, and when adjustment is required, the electrical signal strength, lens focal length adjustment amount and adjusted lens focal length are obtained in turn through a reasonable calculation formula, and finally with the help of the lens focal length adjustment mechanism, the lens focal length can be accurately adjusted, thereby effectively matching the user's visual focus requirements in different visual scenes, and providing users with a clear and comfortable visual experience; using a rechargeable lithium battery as a power module, it can provide stable power supply for each electronic component to ensure the normal operation of the glasses as a whole, and the lithium battery has the advantages of being rechargeable and reusable, and having a high energy density, which is convenient for users to use and conducive to the continuous use of glasses.

[0024] Embodiment 2 As the second embodiment of the present invention, when the present application is implemented, compared with the first embodiment, the technical solution of the present embodiment is different from that of the first embodiment only in that: in this embodiment, the eyeglass frame is also equipped with a small LED lamp, and the LED lamp is powered by a power module; When L>Lmax, the function of adjusting the focus according to D is temporarily stopped, because such strong light interference may cause damage to the eyes and may exceed the normal working range of the sensor and lens; When L<Lmin, a lighting on signal is generated, and the lighting on signal is used to start the LED light through the control unit. After the lighting is improved, it is determined whether the lens focal length needs to be adjusted based on D and the adjusted light intensity; Among them, when L>2×Lmin, the lighting on signal is converted into the lighting off signal; In this embodiment, based on the first embodiment, the glasses frame is equipped with a small LED lamp, which is powered by a power module, so that it has a light compensation function. In strong light, the function of adjusting the focal length according to the deviation can be stopped in time to avoid strong light from causing damage to the eyes and prevent exceeding the normal working range of the sensor and lens; in weak light, a lighting start signal can be generated to start the LED light to improve the lighting environment. After the lighting is improved, it can be determined whether the lens focal length needs to be adjusted according to the corresponding situation. At the same time, it is set that when the light intensity reaches a certain level, the lighting start signal is converted into a lighting off signal. This design enhances the adaptability of glasses to different light environments, and further improves the convenience of user use and the stability of visual experience.

[0025] Embodiment 3 As the third embodiment of the present invention, when the present application is specifically implemented, compared with the first and second embodiments, the technical solution of this embodiment is to combine the solutions of the first and second embodiments mentioned above for implementation.

[0026] This embodiment combines the solutions of embodiment one and embodiment two to combine the advantages of both. It not only has the function of providing users with accurate visual focal length adjustment through reasonable structure, sensor selection and accurate focal length adjustment control mechanism in embodiment one, but also has the advantage of using LED lights for light compensation and corresponding function control in different light intensity environments in embodiment two, so that the smart zoom glasses can achieve better results in terms of materials, functions, environmental adaptability and other aspects, can better meet the visual needs of users in complex and diverse actual usage scenarios, and provide better quality and comprehensive visual services.

[0027] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters and thresholds in the formula are set by technicians in this field according to actual conditions.

[0028] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A smart zoom glasses based on visual feedback mechanism, characterized in that: include: Eyeglass frames, lenses, and electronic components including light sensors, eye tracking sensors, control units, and power modules; Eyeglass frames are used to support the lenses and built-in electronic components; The lens is made of optical zoom material that changes its focal length through external control signals; The light sensors are installed on both sides of the glasses frame. The light sensors are used to detect the intensity and direction of light entering the eyes and obtain the light intensity parameter and light direction vector. The light intensity parameter is marked as L, and the light direction vector is marked as V = (v x , v y , v z ); The eye tracking sensor is installed on the inside of the glasses frame. The eye tracking sensor is used to track the rotation and focus direction of the eyeball, and obtain the eyeball rotation angle and focus direction vector; then the eyeball rotation angle is marked as G, and the focus direction vector is marked as U = (u x ,u y ,u z ); The control unit is embedded in the frame of the glasses, and is used to receive data measured by the light sensor and the eye tracking sensor, and then perform focus adjustment control according to the data; The power module is embedded inside the glasses frame and is used to provide power to the light sensor, eye tracking sensor, and control unit.

2. The smart zoom glasses based on visual feedback mechanism according to claim 1, characterized in that: The focus adjustment control method is as follows: Step K1, calculate the deviation between the light direction vector and the eye focus direction vector, and record it as D; Step K2, determine whether the lens focal length needs to be adjusted according to the deviation D and the light intensity L; Compare the deviation D and the light intensity L with their corresponding preset deviation threshold Dy and preset intensity threshold interval [Lmin, Lmax] respectively, and determine whether the lens focus adjustment signal is generated according to the comparison result; Among them, Lmin is the lower limit of the intensity threshold, and Lmax is the upper limit of the intensity threshold; Step K3, when the lens focus adjustment signal is generated, an electrical signal is sent to the lens to adjust the lens focus.

3. The smart zoom glasses based on visual feedback mechanism according to claim 2, characterized in that: The deviation calculation process in StepK1 is as follows: First, perform vector subtraction on V and U and obtain a new vector W = VU; Then extract the components corresponding to vector V and vector U respectively (v x , v y , v z ) and (u x ,u y ,u z ); Then through: ; Calculate the modulus of W; Then pass: ; The deviation D between the light direction vector and the eye focus direction vector is obtained.

4. The smart zoom glasses based on visual feedback mechanism according to claim 2, characterized in that: In StepK3, the lens focal length is adjusted as follows: Step K3.1, extract the initial focal length of the lens and mark it as J0; Step K3.2, through: ; Calculate the electrical signal strength E; Wherein, β is a preset proportionality coefficient, which is obtained by pre-testing the optical properties of the lens material and the overall performance of the glasses; Step K3.3, through: ; Calculate the adjustment amount of the lens focal length; Where γ is the focal length-electrical signal ratio coefficient determined by the optical properties of the lens material; Step K3.4, through: Calculate the adjusted lens focal length J1; Then the control unit controls the focal length adjustment mechanism of the lens to adjust the focal length of the lens according to the adjusted focal length J1 of the lens.

5. The smart zoom glasses based on visual feedback mechanism according to claim 2, characterized in that: If D≥Dy and L∈[Lmin,Lmax], a lens focus adjustment signal is generated; If D<Dy and L∈[Lmin,Lmax], no lens focus adjustment signal is generated.

6. The smart zoom glasses based on visual feedback mechanism according to claim 2, characterized in that: The eyeglass frame is also equipped with a focal length adjustment mechanism corresponding to the lens, which is connected to the control unit and adjusts the focal length of the lens in response to an electrical signal sent by the control unit; Among them, the power module provides power for the focus adjustment mechanism.

7. The smart zoom glasses based on visual feedback mechanism according to claim 2, characterized in that: When L>Lmax, the function of adjusting the focal length according to D is temporarily stopped.

8. The smart zoom glasses based on visual feedback mechanism according to claim 2, characterized in that: The glasses frame is also equipped with an LED light, and the LED light is powered by a power module; When L<Lmin, a lighting-on signal is generated, and the lighting-on signal is used to start the LED lamp to light up through the control unit.

9. The smart zoom glasses based on visual feedback mechanism according to claim 8, characterized in that: in, When the LED light is on, when L>2×Lmin, the lighting-on signal is converted into a lighting-off signal.

10. The smart zoom glasses based on visual feedback mechanism according to claim 1, characterized in that: in, The power module uses a rechargeable lithium battery.

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