Myopia and presbyopia correction glasses and control method thereof

Abstract

The invention belongs to the technical field of optics, and particularly relates to myopia and presbyopia correction glasses and a control method thereof. The glasses for correcting myopia and presbyopia according to the present invention comprise: a frame; the distance measuring device is installed on the glasses frame and used for measuring the distance between a user and a target watched by the user; the presbyopia optical correction assembly is installed on the glasses frame, and the presbyopia optical correction assembly comprises a liquid crystal lens; the myopic lenses are installed on the glasses frame, and the myopic lenses and the presbyopia optical correction assembly are arranged in an overlapped mode; the control circuit is electrically connected with the presbyopia optical correction assembly and the distance measuring device, and the control circuit is used for determining the driving voltage of the liquid crystal lens according to the distance between the user and the watched target and the presbyopia adjusting amplitude of the user and driving the liquid crystal lens to work through the driving voltage. The myopia and presbyopia of the user can be corrected, and the user experience is improved.

Description

Technical Field

[0001] The invention belongs to the field of optical technology, and in particular is a pair of myopia and presbyopia correction glasses and a control method thereof. Background Art

[0002] For myopic patients, generally after they reach the age of 40 or above, the adjustment ability of the eyes will decline. When they look at distant targets, they can see the distant targets clearly through the correction of myopia glasses, but in order to see the near targets clearly, they need to take off myopia glasses. Some patients also need to wear reading glasses, which makes it very inconvenient for these myopic patients to switch between distant targets and near targets. In response to this, some technicians have proposed bifocal glasses. Part of this type of glasses has a degree for myopia correction, and part of the area has a presbyopia degree, but lacks a degree of transition between myopia and presbyopia. In response to this, some technicians have also proposed progressive multifocal glasses, that is, between the myopia degree and the presbyopia degree, a focus gradient area is set for looking at objects between near and far. Since the aforementioned method requires setting two or three areas with different focal points on the glasses lens with a very limited area, it is easy to interfere with each other in actual use, and the user experience is usually not good. In severe cases, it can also cause serious consequences such as wrestling. Summary of the invention

[0003] In view of this, the present invention provides a pair of myopia and presbyopia correction glasses and a control method thereof to solve the technical problems in the prior art that multifocal glasses are arranged in zones on the lenses, resulting in a reduced field of view and interference between different focal areas.

[0004] The technical solution adopted by the present invention is:

[0005] In a first aspect, the present invention provides a pair of myopia and presbyopia correction glasses, comprising:

[0006] Frames;

[0007] A distance measuring device, mounted on the frame, for measuring the distance between a user and a target viewed by the user;

[0008] A presbyopia optical correction component with adjustable degree, the presbyopia optical correction component is mounted on the frame, and the presbyopia optical correction component includes a liquid crystal lens;

[0009] Myopia lenses, which are mounted on the frame and are superimposed on the presbyopia optical correction component;

[0010] The control circuit is electrically connected to the presbyopia optical correction component and the distance measuring device respectively, and is used to determine the driving voltage of the liquid crystal lens according to the distance between the user and the viewed target and the user's presbyopia adjustment amplitude and drive the liquid crystal lens to work with the driving voltage.

[0011] Preferably, the liquid crystal lens comprises a first substrate, a first electrode layer, a liquid crystal layer, a second electrode layer and a second substrate which are stacked in sequence;

[0012] The first electrode layer is a surface electrode;

[0013] The second electrode layer includes a plurality of electrode units arranged sequentially from the center of the second electrode layer toward the edge of the second electrode layer, and the plurality of electrode units are configured to enable the liquid crystal in the liquid crystal layer to form a phase distribution equivalent to that of a Fresnel lens under the action of a first driving voltage and a second driving voltage.

[0014] Preferably, each of the electrode units comprises a conductive line extending from an end close to the center of the second electrode layer toward an end away from the second electrode layer, and opposite ends of the conductive line are respectively loaded with a first driving voltage and a second driving voltage.

[0015] Preferably, the conductive wire comprises a plurality of connecting segments and a plurality of concentric arcs with gradually increasing radii, one end of the concentric arc is connected to an adjacent concentric arc closer to the center via a connecting segment, and the other end is connected to an adjacent concentric arc farther from the center via another connecting segment, and the spacing between adjacent concentric arcs is the same.

[0016] Preferably, the control circuit is also used to obtain the user's presbyopia adjustment amplitude.

[0017] In a second aspect, the present invention provides a method for controlling myopia and presbyopia correction glasses, which is used to control the glasses described in the first aspect, comprising the following steps:

[0018] S1: Obtain the user's presbyopia adjustment amplitude;

[0019] S2: Controlling the distance measuring device to measure the distance between the target viewed by the user and the user;

[0020] S3: determining the presbyopia addition degree according to the presbyopia adjustment amplitude of the user and the distance between the target viewed by the user and the user;

[0021] S4: Add degrees according to presbyopia to drive the liquid crystal lens to work.

[0022] Preferably, the step S1: obtaining the user's presbyopia adjustment amplitude further includes:

[0023] S11: Obtaining a preset distance between the user and the viewing target;

[0024] S12: obtaining a driving voltage when the user clearly sees a target at a preset distance through the myopia and presbyopia correction glasses as a reference driving voltage;

[0025] S13: determining a reference presbyopia addition degree of the liquid crystal lens according to the reference driving voltage;

[0026] S14: Determine the presbyopia adjustment amplitude according to the reference presbyopia added degree and the preset distance.

[0027] Preferably, the step S3: determining the presbyopia addition degree according to the presbyopia adjustment amplitude of the user and the distance between the target viewed by the user and the user further comprises:

[0028] S31: Obtaining the distance d between the target viewed by the user and the user;

[0029] S32: Obtaining the user's presbyopia adjustment amplitude F;

[0030] S33: Determine the presbyopia added degree F according to the distance d and the presbyopia adjustment amplitude, wherein the presbyopia added degree add=1 / d-0.5F.

[0031] Preferably, the step S4: driving the liquid crystal lens to work according to the degree of presbyopia further comprises:

[0032] S41: Obtaining a correspondence between the focal length of the liquid crystal lens and a driving voltage of the liquid crystal lens;

[0033] S42: determining a first driving voltage and a second driving voltage of the liquid crystal lens corresponding to the presbyopia addition degree according to a correspondence between the presbyopia addition degree and the optical power of the liquid crystal lens and the driving voltage of the liquid crystal lens;

[0034] S43: driving the liquid crystal lens to operate with the determined first driving voltage and second driving voltage.

[0035] Preferably, the step S2: controlling the distance measuring device to measure the distance between the target viewed by the user and the user further comprises:

[0036] S21: Obtaining user eye movement data;

[0037] S22: determining the gaze direction of the user according to the gaze point of the user's eyeball;

[0038] S23: Measuring the distance between the user and the viewed object according to the gaze direction of the user.

[0039] Beneficial effects: The myopia and presbyopia correction glasses of the present invention use the near lens to correct the myopia of the user when the user is viewing a distant target, and use the distance measuring device to measure the distance between the user and the target viewed by the user when the user is viewing a nearby target, and then use the presbyopia optical correction component with adjustable degree to drive the liquid crystal lens to work with a certain optical focal length based on the user's own presbyopia adjustment amplitude and the distance between the user and the target viewed and the user's presbyopia adjustment amplitude, thereby accurately correcting the user's presbyopia and allowing the user to see a clear target. Since the present invention can automatically adjust the degree according to the distance of the viewed target without being divided into multiple areas with different focal points, it not only increases the field of view when viewing distant, medium and near targets, but also avoids the fuzzy area of ​​large aberrations and the mutual interference of different focal areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment of the present invention will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the present invention.

[0041] Figure 1 is a schematic structural diagram of the glasses of the present invention;

[0042] Figure 2 is a structural block diagram of the control circuit in the present invention;

[0043] Figure 3 is a cross-sectional view of a liquid crystal lens of the present invention;

[0044] Figure 4 is a schematic structural diagram of the second electrode layer of the liquid crystal lens of the present invention;

[0045] Figure 5 is a flow chart of the glasses control method of the present invention;

[0046] Figure 6 It is a flow chart of the method for obtaining the presbyopia adjustment amplitude in the present invention;

[0047] Figure 7 A schematic diagram of a process for determining the degree of presbyopia addition in the present invention;

[0048] Figure 8 It is a flow chart of the method for controlling the operation of the liquid crystal lens according to the presbyopia adding degree in the present invention;

[0049] Fig. 9 The figure is a flow chart of the method for obtaining the distance of the viewing target in the present invention. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described in combination with the embodiment of the present invention. It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In the absence of further restrictions, the elements defined by the phrase "comprising..." do not exclude the existence of other identical elements in the process, method, article or device comprising the elements. If there is no conflict, the embodiments of the present invention and the various features in the embodiments can be combined with each other, all within the protection scope of the present invention.

[0051] Example 1

[0052] like Figure 1 As shown, this embodiment provides a pair of myopia and presbyopia correction glasses. The myopia and presbyopia correction glasses in this embodiment mainly include a frame, a distance measuring device 3, a presbyopia optical correction component, a myopia lens 6 and a control circuit 5.

[0053] The frame as the main structure of the glasses is mainly used to install other parts of the glasses. In specific implementation, the frame mainly includes two lens frames 1, two temples 2 and a connecting part connecting the two lens frames 1.

[0054] The myopia lens 6 is mounted on the lens frame 1 of the frame to correct the user's myopia and facilitate the user to clearly see distant objects.

[0055] The distance measuring device 3 is installed on the frame, and is used to measure the distance between the user and the target viewed by the user. In specific implementation, the distance measuring device 3 can be installed at the connection part of the two lens frames 1.

[0056] The distance measuring device 3 can use the time of flight (TOF) method to calculate the distance between the object and the distance measuring device 3 by obtaining the time difference between the light emitted to the surface of the object and reflected back. In this embodiment, the distance measuring device 3 emits light to the target, and then measures the distance between the user and the target observed by the user according to the time from the light being emitted to the light being received by the distance measuring device 3 after being reflected by the target.

[0057] The presbyopia optical correction component is used to correct the presbyopia degree of the user, and the presbyopia degree of the presbyopia optical correction component can be adjusted as needed. In specific implementation, the presbyopia optical correction component includes a liquid crystal lens 4. The focal length of the liquid crystal lens 4 can be controlled by adjusting its driving voltage. In this embodiment, the presbyopia degree of the presbyopia optical correction component can be adjusted by utilizing the electrically controlled variable focus characteristic of the liquid crystal lens 4.

[0058] The control circuit 5 is electrically connected to the presbyopia optical correction component and the distance measuring device 3 respectively, and is used to determine the driving voltage of the liquid crystal lens 4 according to the distance between the user and the viewed object and the presbyopia adjustment amplitude of the user. The presbyopia adjustment amplitude represents the adjustment ability of the user's own eyes, which varies from user to user and changes with changes in physical factors such as the user's age.

[0059] The control circuit 5 can calculate the presbyopia degree required for the presbyopia optical correction component to see the target object clearly based on the distance between the user and the viewed target and the user's presbyopia adjustment amplitude. The aforementioned added presbyopia degree is used as the optical focal length of the liquid crystal lens 4 when it is working, and then the driving voltage of the liquid crystal lens 4 when it is working is determined based on the corresponding relationship between the optical focal length of the liquid crystal lens 4 and the driving voltage.

[0060] When the user watches a target beyond a certain set distance, the presbyopia optical correction component can be turned off, that is, the liquid crystal lens 4 in the presbyopia optical correction component is not loaded with a driving voltage. At this time, the light does not refract when passing through the presbyopia optical correction component, and the myopia and presbyopia correction glasses only play the role of myopia correction, so the correction of myopia and presbyopia will not interfere with each other. When the user watches a target within a set distance, the control circuit 5 drives the liquid crystal lens 4 to work according to the distance between the viewed target and the user, so that the glasses adjust the degree of the presbyopia optical correction component according to the adjustment ability of the user's own eyes and the distance between the user and the target viewed by the user, so that the user can see the closer target clearly.

[0061] Since the human body has two eyes, the left eye and the right eye, two sets of myopia lenses 6 and liquid crystal lenses 4 are also provided, which are used for correcting myopia and presbyopia of the left eye and the right eye respectively. The degree of myopia lenses 6 can be configured according to the degree of correction required by the user's eyes, and the left eye and the right eye are configured independently, while the degree of presbyopia of the left eye and the right eye is independently adjusted by the liquid crystal lenses 4 corresponding to the left eye and the right eye respectively.

[0062] like Figure 2 As shown, the control circuit 540 includes at least one processor 401 and at least one memory 402. Specifically, the processor 401 may be a central processing unit 401 (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiment of the present invention.

[0063] The memory 402 may include a mass storage 402 for data or instructions. By way of example and not limitation, the memory 402 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory 402 may include a removable or non-removable (or fixed) medium. Where appropriate, the memory 402 may be inside or outside the data processing device. In a specific embodiment, the memory 402 is a non-volatile solid-state memory 402. In a specific embodiment, the memory 402 includes a read-only memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0064] The processor 401 implements the control method in the above-mentioned embodiment by reading and executing the computer program instructions stored in the memory 402 .

[0065] In one example, the control circuit 540 of this embodiment may further include a communication interface 403 and a bus, wherein the processor 401, the memory 402, and the communication interface 403 are connected through the bus and communicate with each other.

[0066] The communication interface 403 is mainly used to implement the communication between the modules, devices, units and / or equipment in the embodiment of the present invention.

[0067] The bus includes hardware, software or both, and couples the various components for controlling the circuit 540 to each other. For example, but not limitation, the bus may include an accelerated graphics port (AGP) or other graphics bus, an enhanced industrial standard architecture (EISA) bus, a front-side bus (FSB), a hypertransport (HT) interconnect, an industrial standard architecture (ISA) bus, an infinite bandwidth interconnect, a low pin count (LPC) bus, a memory 402 bus, a microchannel architecture (MCA) bus, a peripheral component interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a serial advanced technology attachment (SATA) bus, a video electronics standard association local (VLB) bus or other suitable bus or a combination of two or more of these. Where appropriate, the bus 410 may include one or more buses. Although the embodiments of the present invention describe and illustrate specific buses, the present invention contemplates any suitable bus or interconnect.

[0068] like Figure 3 As shown, as an example, the liquid crystal lens 4 in the presbyopia optical correction component of this embodiment includes a first substrate, a first electrode layer, a liquid crystal layer, a second electrode layer and a second substrate which are stacked in sequence;

[0069] The first electrode layer is a surface electrode;

[0070] The second electrode layer includes a plurality of electrode units arranged sequentially from the center of the second electrode layer toward the edge of the second electrode layer, and the plurality of electrode units are configured to enable the liquid crystal in the liquid crystal layer to form a phase distribution equivalent to that of a Fresnel lens under the action of a first driving voltage and a second driving voltage.

[0071] When the first driving voltage and the second driving voltage are respectively applied to the two ends of the electrode unit, a potential distribution which changes in a gradient from the position of the electrode unit toward the center to the position of the electrode unit away from the center will be generated on the electrode unit.

[0072] The aforementioned liquid crystal lens 4 can form a Fresnel liquid crystal lens 4 after loading the first driving voltage and the second driving voltage. The area controlled by each electrode unit after loading the driving voltage corresponds to a liquid crystal Fresnel ring zone, and the width of each electrode unit is the same as the width of the corresponding Fresnel zone. Assume that the width of the i-th electrode unit arranged from the center to the edge position of the second electrode layer 54 is wi, where w0 is the width of the electrode unit at the center (the first electrode unit), then wi=w0(i1 / 2-(i-1)1 / 2), where i is a positive integer greater than or equal to, and the larger the value of i, the closer the electrode unit is to the edge position of the second electrode layer.

[0073] As an example, in this embodiment, each of the electrode units includes a conductive line extending from one end close to the center of the second electrode layer to one end away from the second electrode layer, and the first driving voltage and the second driving voltage are respectively loaded at opposite ends of the conductive line. The potential on the conductive line changes gradiently from inside to outside along the conductive line, and is distributed in a parabolic shape in the radial direction of the electrode unit, thereby driving the liquid crystal layer in the liquid crystal lens 4 to deflect, so that the passing light is distributed with a phase delay corresponding to the aforementioned Fresnel ring zone.

[0074] In this embodiment, the conductive line includes a plurality of connecting segments 42 and a plurality of concentric arcs 41 with gradually increasing radii. One end of the concentric arc 41 is connected to an adjacent concentric arc 41 closer to the center via a connecting segment 42, and the other end is connected to an adjacent concentric arc 41 farther from the center via another connecting segment 42. The spacing between adjacent concentric arcs 41 is the same.

[0075] One end of the concentric arc 41 closest to the center of the second electrode layer in the electrode unit is connected to the lead wire loaded with the driving voltage, and the other end is connected to the adjacent concentric arc 41. One end of the concentric arc 41 farthest from the center of the second electrode layer in the electrode unit is connected to the lead wire loaded with the driving voltage, and the other end is connected to the adjacent concentric arc 41.

[0076] Since the conductive wires in the electrode unit in this embodiment adopt the structure of the aforementioned concentric arc 41 segments, when the electrode unit is loaded with a driving voltage, an accurate electric potential distribution in the form of a rotating parabola can be generated, thereby forming a high-precision Fresnel liquid crystal lens 4. In addition, the liquid crystal lens 4 of this structure has a faster response speed, generally within the range of 10-500 milliseconds, so that the liquid crystal lens 4 can quickly adjust the optical focal length and compensate for the adjustment ability of the human eye, so that the user can see nearby objects clearly.

[0077] Since there are often multiple objects in the user's field of vision, this embodiment can filter out the object that the user wants to observe from these objects as the target object for focusing. As one example, the detection device can be installed on the connecting part between the two lens frames 1, so that the image acquisition module is located in the middle of the frame. When using it, the user turns his head to the angle for the target object. The system defaults that the object closest to the glasses is the target object that the user wants to observe.

[0078] In actual applications, users observe objects in different directions by rotating their eyeballs. At this time, the method of assuming that the object closest to the glasses is the target object cannot fully meet the user's usage needs. In this regard, in this embodiment, the glasses also include an eye movement tracking device, which is installed on the frame. The control circuit 5 is electrically connected to the eye movement tracking device, and the eye movement tracking device is used to track the user's eye movement. The control circuit 5 determines the target object that the user is looking at based on the user's eye movement and the image captured by the image acquisition module.

[0079] In this embodiment, the eye movement tracking device includes an infrared transmitter and an infrared sensor. The infrared sensor is used to send infrared rays to the user's eyes, and the infrared sensor is used to receive infrared images reflected by the user's eyes. The control circuit 540 tracks the user's eye movement based on the infrared image.

[0080] The eye movement tracking device can be installed on the side of the glasses frame facing the user's eyeballs so that the infrared light emitted by the eye movement tracking device can reach the position of the user's eyeballs. The eye movement tracking device includes one or more infrared LED light sources that emit invisible infrared light to illuminate the user's eyes. Infrared light has little interference with ambient light and will not make the user feel uncomfortable.

[0081] Example 2

[0082] like Figure 5 As shown, this embodiment provides a control method for myopia and presbyopia correction glasses, which is used to control the glasses described in Example 1. The method mainly includes the following steps:

[0083] S1: Obtain the user's presbyopia adjustment amplitude;

[0084] The presbyopia adjustment amplitude of the user reflects the user's own ability to adjust presbyopia, and the presbyopia adjustment amplitudes of different users are different, and the presbyopia adjustment amplitude of the same user will also change with the change of factors such as the user's age. In order to accurately calculate the presbyopia added degree of the presbyopia correction component so that the user can clearly see the target, the glasses in this embodiment first obtain the presbyopia adjustment amplitude of the user before use.

[0085] S2: Control the distance measuring device 3 to measure the distance between the target viewed by the user and the user;

[0086] The distance between the target viewed by the user and the user refers to the distance between the user's eyes and the target viewed by the user. Since the distance measuring device 3 is mounted on the glasses, when the glasses are worn in front of the user's eyes, the distance between the distance measuring device 3 and the target can be approximately regarded as the distance between the user's eyes and the target viewed by the user.

[0087] S3: determining the presbyopia addition degree according to the presbyopia adjustment amplitude of the user and the distance between the target viewed by the user and the user;

[0088] This step specifically calculates the distance-related presbyopia added degree according to the user's own presbyopia adjustment amplitude, so that the user can see the target clearly under the combined effect of the user's own presbyopia adjustment ability and the presbyopia added degree of the presbyopia correction component.

[0089] S4: driving the liquid crystal lens 4 to work according to the degree of presbyopia.

[0090] In this step, the optical power of the liquid crystal lens 4 is determined according to the presbyopia degree, and then the corresponding driving voltage is found through the optical power to drive the liquid crystal lens 4 to work.

[0091] like Figure 6 As shown, in this embodiment, the step S1: obtaining the user's presbyopia adjustment amplitude further includes:

[0092] S11: Obtaining a preset distance between the user and the viewing target;

[0093] The aforementioned preset distance can be manually set in advance.

[0094] S12: obtaining a driving voltage when the user clearly sees a target at a preset distance through the myopia and presbyopia correction glasses as a reference driving voltage;

[0095] After the user puts on the glasses of this embodiment, he or she views a target at a preset distance and adjusts the driving voltage of the liquid crystal lens 4 to change the focal length of the liquid crystal lens 4. During the adjustment process, the clarity of the target viewed by the user will also change, and the driving voltage of the liquid crystal lens 4 when the user feels that the target is the clearest can be used as a reference driving voltage.

[0096] S13: determining a reference presbyopia addition degree of the liquid crystal lens 4 according to the reference driving voltage;

[0097] In this step, a calibration experiment may be performed to determine the corresponding relationship curve between the driving voltage and the optical focal length of the liquid crystal lens 4. Then, the optical focal length of the liquid crystal lens 4 corresponding to the reference driving voltage is found through the corresponding relationship curve, and the optical focal length is used as the presbyopia addition degree.

[0098] S14: Determine the presbyopia adjustment amplitude according to the reference presbyopia added degree and the preset distance.

[0099] In this step, the presbyopia adjustment amplitude can be determined according to the formula add=1 / d-0.5F, where add is the presbyopia added degree. d is the distance from the user to the target viewed by the user, where d is the preset distance in step S11. Where F is the presbyopia adjustment amplitude.

[0100] Since the presbyopia adjustment amplitudes of the left and right eyes of the user may be different, the presbyopia adjustment amplitudes of the left and right eyes may be obtained separately.

[0101] like Figure 7 As shown, the step S3: determining the presbyopia addition degree according to the presbyopia adjustment amplitude of the user and the distance between the target viewed by the user and the user also includes:

[0102] S31: Obtaining the distance d between the target viewed by the user and the user;

[0103] In this step, a distance measuring device is used to measure the target viewed by the user to obtain a distance d between the target viewed by the user and the user.

[0104] S32: Obtaining the user's presbyopia adjustment amplitude F;

[0105] The presbyopia adjustment amplitude F is detected by the aforementioned methods S11 to S14 before the user officially uses it.

[0106] S33: Determine the presbyopia added degree F according to the distance d and the presbyopia adjustment amplitude, wherein the presbyopia added degree add=1 / d-0.5F.

[0107] like Figure 8 As shown, in this embodiment, the step S4: driving the liquid crystal lens 4 to work according to the degree of presbyopia also includes:

[0108] S41: Obtaining the corresponding relationship between the optical power of the liquid crystal lens 4 and the driving voltage of the liquid crystal lens 4;

[0109] The corresponding relationship between the focal length of the liquid crystal lens 4 and the driving voltage of the liquid crystal lens refers to the focal length of the liquid crystal lens 4 corresponding to a certain driving voltage applied to the liquid crystal lens 4. Assuming that the first driving voltage of the liquid crystal lens 4 is v1 and the second driving voltage is v2, the driving voltage of the liquid crystal lens 4 (v0 = v2-v1.

[0110] S42: determining a first driving voltage and a second driving voltage of the liquid crystal lens 4 corresponding to the presbyopia addition degree according to a correspondence between the presbyopia addition degree and the optical power of the liquid crystal lens 4 and the driving voltage of the liquid crystal lens 4;

[0111] In this step, the presbyopia can be added as the optical focal length of the liquid crystal lens 4 when it is working, and then the corresponding first driving voltage and second driving voltage of the liquid crystal lens 4 are found according to the optical focal length of the liquid crystal lens 4 when it is working.

[0112] S43: driving the liquid crystal lens 4 to operate with the determined first driving voltage and second driving voltage.

[0113] In this step, the first driving voltage and the second driving voltage determined above are applied to the liquid crystal lens 4 .

[0114] By default, the distance measuring device uses the nearest object directly in front of the glasses as the target distance measurement.

[0115] like Fig. 9 As shown, in actual applications, users observe objects in different directions by rotating their eyeballs. At this time, the method of assuming that the object closest to the glasses is the target object cannot fully meet the user's usage needs. In order to more accurately obtain the target viewed by the user and to more accurately measure the distance between the user and the target viewed by the user, this embodiment can also detect the distance between the user and the target viewed by the user by capturing the movement of the user's eyeballs, which mainly includes the following steps:

[0116] S21: Obtaining user eye movement data;

[0117] In a specific implementation, an eye movement tracking device installed on the frame can be used to obtain the user's eye movement data.

[0118] S22: Determine the gaze point of the user's eyeball according to the user's eyeball movement data;

[0119] When the user uses the glasses, the sensor will continue to track the user's eye movement and determine the area the user is currently looking at. The control circuit 5 analyzes these data in real time to determine the exact position of the user's gaze. The human eyeball consists of a cornea and a pupil. After infrared light is irradiated to the eyeball, part of the light will be reflected back by the cornea, and the sensor captures these reflected lights. Because the pupil absorbs infrared light, it usually appears as a black area in the sensor image, and the reflected light will form a highlight on the cornea. The infrared sensor captures the image of the reflected light from the eyeball through a high-frame rate camera. The camera needs to have a high resolution and a high frame rate to ensure that the subtle movements of the eyeball can be accurately captured. The control circuit 5 receives the captured eyeball images from the infrared sensor and pre-processes these images. The pre-processing includes denoising, enhancing contrast, and filtering out unnecessary background information. The control circuit 5 can use an image processing algorithm to identify the key feature points of the eyeball, where the key feature points include but are not limited to the center of the pupil and the corneal reflected light point.

[0120] S22: determining the gaze direction of the user according to the gaze point of the user's eyeball;

[0121] In this step, the orientation at which the user is gazing can be found based on the positions of the key feature points of the eyeball in the eye.

[0122] S23: Measure the distance between the user and the target being viewed according to the orientation at which the user is gazing.

[0123] In this step, the sensor can be controlled to emit signals in the orientation at which the user is gazing, so as to measure the distance between the user and the target being viewed.

[0124] The eye movement tracking device of this embodiment includes an infrared emitter and an infrared sensor. The infrared sensor is used to send infrared rays to the user's eyeball, and the infrared sensor is used to receive the infrared image reflected by the user's eyeball. Among them, the control circuit 5 can track the eye movement of the user according to the infrared image.

[0125] Among them, the eye movement tracking device can be installed on one side of the spectacle frame facing the user's eyeball, so that the infrared rays emitted by the eye movement tracking device can reach the position of the user's eyeball. The eye movement tracking device includes one or more infrared LED light sources, and these light sources emit invisible infrared light to illuminate the user's eyes. Infrared light is less affected by ambient light and will not cause discomfort to the user.

[0126] During daily wearing, the distance measuring device will continuously or periodically record the distance between the user and the target being viewed; if it is found that the user spends most of the time using the eyes at a short distance, it means that a higher presbyopia correction is needed; if the user is mostly at a medium distance or a long distance, the presbyopia correction requirement can be relatively reduced; by objectively evaluating the "statistical distribution of usage distances", the presbyopia adjustment amplitude can be adaptively corrected. The specific implementation process is as follows:

[0127] The S1: Obtaining the presbyopia adjustment amplitude of the user includes:

[0128] S101: Record the real-time measured distances of the distance measuring device at each time period during the user's daily use, and obtain a distance sampling sequence corresponding to multiple time periods;

[0129] S102: Obtain a preset distance interval;

[0130] Among them, the distance interval is the distance range between the human eye and the target object. For example, three distance intervals can be set, namely short distance: d ≤ 40 cm d, medium distance: 40 cm < d ≤ 70, long distance: d > 70 cm d.

[0131] S103: Statistically analyze the distance sampling sequence corresponding to each time period according to the preset distance interval, and obtain the proportion of each distance interval at each time period;

[0132] The time periods can be divided according to the user's eye habits, for example, into four time periods: morning, daytime, dusk and night.

[0133] Then, we can count the number of short distance, medium distance and long distance in the distance sampling sequences of the four time periods: morning, daytime, dusk and night. Finally, we can divide the number of short distance, medium distance and long distance by the total number of distances to get the proportion of each distance interval in each time period:

[0134] For example, in the morning time period, the proportions of the three distance intervals of near distance, medium distance, and far distance are Pm~near, Pm~mid, and Pm~far respectively;

[0135] For example, during the daytime, the proportions of the three distance intervals of near distance, medium distance, and far distance are Pd~near, Pd~mid, and Pd~far respectively;

[0136] For example, for the dusk time period, the proportions of the three distance intervals of near distance, middle distance, and far distance are Pe~near, Pe~mid, and Pe~far respectively;

[0137] For example, for the night time period, the proportions of the three distance intervals of near distance, medium distance, and far distance are Pn~near, Pn~mid, and Pn~far respectively;

[0138] S104: determining the influence weight of each distance interval on the presbyopia adjustment amplitude according to the user's eye usage pattern in each time period;

[0139] From the perspective of visual physiology, close distance (for activities such as reading and looking at mobile phones) is extremely critical. Once the correction is insufficient, blur or fatigue will immediately appear. Therefore, the user's eye usage mode is more important for close distance when reading, looking at mobile phones and other activities.

[0140] The middle distance is usually the distance for looking at a computer or working at a desktop, and the presbyopia degree should not be too high (so as not to affect the clarity or produce aberrations); therefore, when the user's eye usage mode is looking at a computer or working at a desktop, the corresponding influence weight of the close distance is greater.

[0141] Long distance has relatively little effect on presbyopia, so it can be given less weight or no additional power.

[0142] S105: determining a comprehensive adjustment coefficient corresponding to each time period according to the influence weight of each distance interval on the presbyopia adjustment amplitude in each time period and the proportion of each distance interval in each time period;

[0143] Specifically, the influence weight of each distance interval on the presbyopia adjustment amplitude in each time period and the proportion of each distance interval in each time period determine the adjustment value corresponding to each distance in each time period, and the adjustment value is the product of the influence weight and the proportion of the distance interval.

[0144] The comprehensive adjustment coefficient corresponding to each time period is determined according to the adjustment value corresponding to each distance in each time period, and the comprehensive adjustment coefficient is the sum of the adjustment values ​​corresponding to all distances in the time period.

[0145] For example, Km = Wm~near × Pm~near + Wm~mid × Pm + Wm~far × Pm~far, where Wm~near, Wm~mid, and Wm~far are the weight coefficients corresponding to the near distance, the middle distance, and the far distance in the morning time period, respectively;

[0146] Kd = Wd~near × Pd~near + Wd~mid × Pm + Wd~far × Pd~far, where Wd~near, Wd~mid, and Wd~far are the weight coefficients corresponding to the near distance, medium distance, and far distance in the morning time period, respectively;

[0147] Ke=We~near×Pe~near+We~mid×Pm+We~far×Pe~far, where We~near, We~mid, and We~far are the weight coefficients corresponding to the near distance, the middle distance, and the far distance in the morning time period respectively;

[0148] Kn=Wn~near×Pn~near+Wn~mid×Pm+Wn~far×Pn~far, where Wn~near, Wn~mid, and Wn~far are the weight coefficients corresponding to the near distance, medium distance, and far distance in the morning time period respectively;

[0149] S106: determining the presbyopia adjustment correction amount corresponding to each time period according to the comprehensive adjustment coefficient corresponding to each time period;

[0150] The morning presbyopia adjustment amplitude correction ΔFm=am×Km+bm;

[0151] The correction amount of presbyopia adjustment during the day ΔFd=ad×Kd+bd;

[0152] The evening presbyopia adjustment amplitude correction ΔFe=ae×Ke+be;

[0153] The correction amount of presbyopia adjustment at night is ΔFn = an × Kn + bn;

[0154] S107: Correct the presbyopia adjustment amplitude in the corresponding time period according to the presbyopia adjustment amplitude and the presbyopia adjustment correction amount corresponding to each time period. Assuming that the presbyopia adjustment amplitude before adjustment is F0, the presbyopia adjustment amplitude in the morning after adjustment is Fm=ΔFm+F0, the presbyopia adjustment amplitude in the daytime is Fd=ΔFd+F0, the presbyopia adjustment amplitude in the evening is Fe=ΔFe+F0, and the presbyopia adjustment amplitude in the evening is Fn=ΔFn+F0.

[0155] During daily wear, the distance measuring device will continuously or periodically record the distance between the user and the target they are looking at. If it is found that the user is using their eyes at close range most of the time, it means that a higher level of presbyopia correction is needed. If the user is at medium or long distances most of the time, the need for presbyopia correction can be relatively reduced. By objectively evaluating the "statistical distribution of usage distance", the presbyopia adjustment amplitude can be adaptively corrected.

[0156] The step S106 of determining the presbyopia adjustment correction amount corresponding to each time period according to the comprehensive adjustment coefficient corresponding to each time period includes:

[0157] S1061: Obtaining the duration of the user's close-up eye use;

[0158] The duration of the user's close-range eye use can be determined by the duration of time during which the target distance measured by the distance measuring device remains within the close-range range.

[0159] S1062: Obtaining an eye fatigue index of the user according to the duration of the user's close-range eye use;

[0160] The relationship between the duration of close-range eye use by a user and the user's eye fatigue index can be calibrated through experiments. The longer the duration of close-range eye use, the higher the fatigue index.

[0161] S1063: Adjust the presbyopia adjustment amplitude correction amount according to the user's eye fatigue index.

[0162] The higher the user's eye fatigue index is, the higher the presbyopia adjustment range is. This embodiment is based on the compensation rule of the user's fatigue index. It records the user's close-up eye use time, evaluates the eye fatigue index, and adds presbyopia adjustment correction for the fatigue period, thereby reducing the user's eye fatigue.

[0163] S1: obtaining the user's presbyopia adjustment amplitude also includes;

[0164] Obtain the change in adjustment amplitude between two adjacent time periods;

[0165] The change in accommodation amplitude between two adjacent time periods refers to the difference between the presbyopia accommodation amplitude in the previous time period and the presbyopia accommodation amplitude in the next time period.

[0166] Get the adjustment amplitude transition time;

[0167] The accommodation amplitude transition time refers to the time period during which the presbyopia accommodation amplitude transitions from the presbyopia accommodation amplitude in the previous time period to the presbyopia accommodation amplitude in the next time period, and this time period can be selected based on experience.

[0168] The presbyopia amplitude change rule within the adjustment amplitude transition time is determined according to the adjustment amplitude change amount and the adjustment amplitude transition time, wherein the presbyopia amplitude change rule is that the presbyopia adjustment amplitude of the previous time period gradually transitions to the presbyopia adjustment amplitude of the next time period within the middle range of the adjustment amplitude transition.

[0169] After adopting the aforementioned transition method of presbyopia adjustment amplitude, the presbyopia adjustment amplitude can be gradually adjusted within the time window to ensure that the change process of presbyopia adjustment amplitude is smooth and avoid sudden visual jumps.

[0170] The above is a detailed introduction to the myopia and presbyopia correction glasses and the glasses control method provided by the embodiments of the present invention.

[0171] It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figure. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiment, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention. The functional blocks shown in the structural block diagram described above can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, plug-in, function card, etc. When implemented in software, the elements of the present invention are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or communication link via a data signal carried in a carrier. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, and the like. The code segments can be downloaded via a computer network such as the Internet, an intranet, etc. It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0172] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. Myopia and presbyopia correction glasses, characterized in that: include: Frames; A distance measuring device, mounted on the frame, for measuring the distance between a user and a target viewed by the user; A presbyopia optical correction component with adjustable degree, the presbyopia optical correction component is mounted on the frame, and the presbyopia optical correction component includes a liquid crystal lens; Myopia lenses, which are mounted on the frame and are superimposed on the presbyopia optical correction component; The control circuit is electrically connected to the presbyopia optical correction component and the distance measuring device respectively, and is used to determine the driving voltage of the liquid crystal lens according to the distance between the user and the viewed target and the user's presbyopia adjustment amplitude and drive the liquid crystal lens to work with the driving voltage.

2. The myopia and presbyopia corrective glasses according to claim 1, characterized in that: The liquid crystal lens comprises a first substrate, a first electrode layer, a liquid crystal layer, a second electrode layer and a second substrate which are stacked in sequence; The first electrode layer is a surface electrode; The second electrode layer includes a plurality of electrode units arranged sequentially from the center of the second electrode layer toward the edge of the second electrode layer, and the plurality of electrode units are configured to enable the liquid crystal in the liquid crystal layer to form a phase distribution equivalent to that of a Fresnel lens under the action of a first driving voltage and a second driving voltage.

3. The myopia and presbyopia corrective glasses according to claim 2, characterized in that: Each of the electrode units includes a conductive line extending from one end close to the center of the second electrode layer to one end away from the second electrode layer, and two opposite ends of the conductive line are respectively loaded with a first driving voltage and a second driving voltage.

4. The myopia and presbyopia corrective glasses according to claim 3, characterized in that: The conductive wire includes a plurality of connecting segments and a plurality of concentric arcs with gradually increasing radii. One end of the concentric arc is connected to an adjacent concentric arc closer to the center through a connecting segment, and the other end is connected to an adjacent concentric arc farther from the center through another connecting segment. The spacing between adjacent concentric arcs is the same.

5. The myopia and presbyopia correction glasses according to any one of claims 1 to 4, characterized in that: The control circuit is also used to obtain the user's presbyopia adjustment amplitude.

6. A method for controlling myopia and presbyopia correction glasses, characterized in that: Used to control the glasses according to any one of claims 1 to 5, comprising the following steps: S1: Obtain the user's presbyopia adjustment amplitude; S2: Controlling the distance measuring device to measure the distance between the target viewed by the user and the user; S3: determining the presbyopia addition degree according to the presbyopia adjustment amplitude of the user and the distance between the target viewed by the user and the user; S4: Add degrees according to presbyopia to drive the liquid crystal lens to work.

7. The method for controlling myopia and presbyopia correction glasses according to claim 6, characterized in that: The step S1: obtaining the user's presbyopia adjustment amplitude further includes: S11: Obtaining a preset distance between the user and the viewing target; S12: obtaining a driving voltage when the user clearly sees a target at a preset distance through the myopia and presbyopia correction glasses as a reference driving voltage; S13: determining a reference presbyopia addition degree of the liquid crystal lens according to the reference driving voltage; S14: Determine the presbyopia adjustment amplitude according to the reference presbyopia added degree and the preset distance.

8. The method for controlling myopia and presbyopia correction glasses according to claim 6, characterized in that: The step S3: determining the presbyopia addition degree according to the presbyopia adjustment amplitude of the user and the distance between the target viewed by the user and the user also includes: S31: Obtaining the distance d between the target viewed by the user and the user; S32: Obtaining the user's presbyopia adjustment amplitude F; S33: Determine the presbyopia added degree according to the distance d and the presbyopia adjustment amplitude F, wherein the presbyopia added degree add=1 / d-0.5F.

9. The method for controlling myopia and presbyopia correction glasses according to claim 6, characterized in that: The step S4: driving the liquid crystal lens according to the degree of presbyopia also includes: S41: Obtaining a correspondence between the focal length of the liquid crystal lens and a driving voltage of the liquid crystal lens; S42: determining a first driving voltage and a second driving voltage of the liquid crystal lens corresponding to the presbyopia addition degree according to a correspondence between the presbyopia addition degree and the optical power of the liquid crystal lens and the driving voltage of the liquid crystal lens; S43: driving the liquid crystal lens to operate with the determined first driving voltage and second driving voltage.

10. The method for controlling myopia and presbyopia correction glasses according to any one of claims 6 to 9, characterized in that: The step S2: controlling the distance measuring device to measure the distance between the target viewed by the user and the user also includes: S21: Obtaining user eye movement data; S22: determining the gaze direction of the user according to the gaze point of the user's eyeball; S23: Measuring the distance between the user and the viewed object according to the gaze direction of the user.

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