Lens, glasses and lens adjustment method

Abstract

The present application provides a lens, glasses and a lens adjustment method. The lens includes a first lens layer, the first lens layer includes a plurality of liquid crystal regions, at least one liquid crystal region forms a first optical zone, and at least one liquid crystal region forms a second optical zone. In the present application, by controlling the rotation of liquid crystal molecules in the liquid crystal regions respectively included in the first optical zone and the second optical zone, the optical focal length of the liquid crystal region can be changed, so that the optical focal length of the first optical zone can be different from the optical focal length of the second optical zone. In this way, the optical focal length formed by the first optical zone can correspond to the user's myopia degree, and the optical focal length of the second optical zone corresponds to the defocus degree, so that when the human eye's gaze point falls on the first optical zone, clear far vision can be obtained, and the second optical zone can have a defocusing effect, so as to effectively prevent and control myopia for the human eye.

Description

Technical Field

[0001] The present application relates to the technical field of optical equipment, and in particular to a lens, glasses and a lens adjustment method. Background Art

[0002] Myopia is an extremely common eye disease, with an estimated 1.5 billion people suffering from it worldwide. In recent years, due to the widespread popularity of consumer electronics, the myopia rate among young people and children has increased year by year. The myopia problem is particularly serious in China. According to data from the National Health Commission, the trend of younger onset of myopia has been very obvious in recent years.

[0003] At present, when myopia occurs, it is usually solved by wearing myopia glasses. However, myopia glasses can only solve the problem of far vision. When reading and writing at close range, myopia glasses will make the focus of objects move further back, which just increases the burden of close-range eye use, thereby aggravating the development of myopia and causing further deterioration of vision.

[0004] In order to alleviate the problem of myopia development aggravated by wearing myopia glasses, the peripheral defocus theory was proposed. By setting a certain amount of light addition in the peripheral defocus area of ​​the lens (i.e. reducing the diopter), the light incident through the peripheral defocus area is converged in advance to form myopic defocus, thereby preventing and controlling the development of myopia. However, the position of the peripheral defocus area of ​​the current myopia glasses with defocus design is fixed, and it cannot change with the rotation of the eyeball, so it is not suitable for eye use scenarios with different gaze angles, resulting in the defocus function cannot be fully exerted, and even the defocus is difficult to tolerate and the compliance is reduced, affecting the myopia prevention and control effect. Based on this, providing a lens that can flexibly adjust the position of the defocus area has become a difficult problem to be solved in this field. Summary of the invention

[0005] The purpose of the present application is to provide a lens, glasses and a lens adjustment method, so that the peripheral defocus area of ​​the lens can be flexibly adjusted, thereby being able to adapt to the defocus blur tolerance requirements of the user after the gaze angle changes.

[0006] In the first aspect of the present application, a lens is provided, which includes a first lens layer, and the first lens layer includes a plurality of first liquid crystal regions. In the present application, at least one first liquid crystal region can form a first optical zone on the first lens layer, and at least one first liquid crystal region can form a second optical zone on the first lens layer, and the second optical zone can be arranged around the first optical zone. It can be understood that the optical focal lengths generated by the first liquid crystal regions used to form the first optical zone are the same, and the optical focal lengths generated by the first liquid crystal regions used to form the second optical zone are the same or different, but the optical focal lengths of the first optical zone and the second optical zone are different. In this way, the optical focal length formed by the first optical zone can correspond to the myopia degree of the user, and the optical focal length of the second optical zone corresponds to the defocus degree, so that when the gaze point of the human eye falls on the first optical zone, clear far vision can be obtained, and the second optical zone can have a defocusing effect, so as to effectively prevent and control myopia for the human eye.

[0007] In addition, in the present application, as the position of the human eye's gaze point on the lens changes, the liquid crystal area included in the first optical zone and the second optical zone changes, thereby causing the position of the first optical zone and the second optical zone to change accordingly. In this way, the user's personalized defocus blur tolerance needs can be met, thereby achieving an effective myopia prevention and control effect.

[0008] When the first lens layer is specifically set, the first lens layer may also include a first substrate, a second substrate, a first electrode and a second electrode. Among them, the first electrode is set on the first substrate, and the second electrode is set on the second substrate. In the present application, the second electrode includes a plurality of sub-electrode pairs, each of which includes a first sub-electrode and a second sub-electrode. The second sub-electrode may be set as a ring electrode. In addition, the first sub-electrodes of each sub-electrode pair may be connected so that the voltage applied to the first sub-electrode of each sub-electrode pair is the same, so that by adjusting the voltage applied to the second sub-electrode of each sub-electrode pair, a voltage difference can be made between the first sub-electrode and the second sub-electrode of each sub-electrode pair. In some other implementations of the present application, the second sub-electrodes of each sub-electrode pair may also be connected so that the voltage applied to the second sub-electrode of each sub-electrode pair is the same, so that by adjusting the voltage applied to the first sub-electrode of each sub-electrode pair, a voltage difference can be made between the first sub-electrode and the second sub-electrode of each sub-electrode pair. Thereby, the structure of the first lens layer can be effectively simplified. In some other possible implementations of the present application, the voltages applied to the first sub-electrode and the second sub-electrode of each sub-electrode pair can be adjusted respectively, thereby adjusting the voltage difference between the first sub-electrode and the second sub-electrode of each sub-electrode pair, so as to achieve independent control of the voltage difference of each sub-electrode pair.

[0009] In addition, in the present application, a plurality of first liquid crystal regions are arranged between the first substrate and the second substrate, and the plurality of first liquid crystal regions are arranged one-to-one with a plurality of sub-electrode pairs, and the second sub-electrode of each sub-electrode pair is arranged corresponding to the edge of the first liquid crystal region. Each first liquid crystal region includes liquid crystal molecules, and a voltage difference exists between the first sub-electrode and the second sub-electrode of each sub-electrode pair. In this way, the liquid crystal molecules in the first liquid crystal region can be deflected under the action of the voltage difference between the first sub-electrode and the second sub-electrode of the corresponding sub-electrode pair, thereby generating corresponding optical focal length.

[0010] Since no liquid crystal molecules are distributed in the region between two adjacent first liquid crystal regions, the optical focal length of the region between the two first liquid crystal regions is 0. In a possible implementation of the present application, the optical focal length formed in the first liquid crystal region in the first optical zone can be made 0, so that the optical focal length in the entire first optical zone can be unified, so that the gaze point falling in the first optical zone can obtain a clear visual effect.

[0011] In addition, in the present application, the optical power in the second optical zone can be gradually increased in the direction from the first optical zone to the second optical zone, so that the second optical zone can form a progressive defocus effect, which is beneficial to improving the effect of myopia prevention and control.

[0012] The optical power of the second optical zone can be gradually increased by adjusting the optical power formed by each first liquid crystal region in the second optical zone. In specific implementation, each first liquid crystal region in the second optical zone can form an optical power, and the optical power formed by each first liquid crystal region can be the same or different. In this way, in the direction from the first optical zone to the second optical zone, the optical power of the first liquid crystal region in the second optical zone can be gradually increased, so that the optical power of the second optical zone can be gradually increased.

[0013] In a possible implementation of the present application, the lens may further include a second lens layer, and the first lens layer and the second lens layer may be stacked to meet the requirements of the optical focal lengths of different optical zones of the lens by superimposing the optical focal lengths of the first lens layer and the second lens layer. For example, the optical focal length of the first optical zone of the first lens layer may be set to 0, and the optical focal length of the second lens layer may be set to the user's visual focal length, thereby providing a vision correction effect through the second lens layer. In addition, the peripheral defocus effect of the lens may be achieved by superimposing the optical focal length of the second optical zone of the first lens and the optical focal length of the second lens layer.

[0014] When the second lens layer is specifically arranged, the second lens layer may be a solid concave lens layer, the second lens layer includes a first surface and a second surface arranged opposite to each other, the first surface is a concave surface, the second surface is a plane, and the first lens layer may be located on the side of the second surface away from the first surface. In addition, it can be understood that the first lens layer may be bonded to the second surface of the second lens layer, or may be arranged at a distance from the second lens layer, and other possible lens layers may be arranged between the first lens layer and the second lens layer.

[0015] In some other possible implementations of the present application, the second lens layer may also include two solid-state lenses, both of which have curved surfaces, and at least parts of the curved surfaces of the two solid-state lenses are arranged relative to each other. In this way, the optical power of the second lens layer can be obtained by superimposing the optical power of the two solid-state lenses. Because at least parts of the curved surfaces of the two solid-state lenses are arranged relative to each other, as the two solid-state lenses are dislocated, the parts of the curved surfaces of the two solid-state lenses that are arranged relative to each other can be dislocated, thereby changing the optical power of the superimposed parts of the two solid-state lenses, so that the optical power of the second lens layer is changed.

[0016] The second lens layer may also be provided with a liquid lens layer, and the second lens layer may include a third substrate, a fourth substrate and a baffle. The third substrate and the fourth substrate are arranged opposite to each other, and at least one of the third substrate and the fourth substrate is an elastic film substrate. In addition, the baffle may be arranged between the third substrate and the fourth substrate, and the baffle may be arranged along the edge of the third substrate and the fourth substrate for a circle, and the baffle is connected to the third substrate and the fourth substrate to enclose a closed liquid storage chamber between the third substrate, the fourth substrate and the baffle. The liquid storage chamber is filled with optical liquid, and the baffle may also be provided with a liquid inlet and outlet channel, which is used for the optical liquid to be filled into the liquid storage chamber, and may also be used for the optical liquid to be discharged from the liquid storage chamber. Since at least one of the third substrate and the fourth substrate is an elastic film substrate, as the volume of the optical liquid in the liquid storage chamber changes, the supporting force of the optical liquid on the elastic film substrate changes, thereby changing the curvature of the elastic film substrate, so that the second lens layer forms a corresponding optical focal length.

[0017] In a possible implementation of the present application, the second lens layer is a liquid crystal lens layer, and the second lens layer may include a third substrate, a fourth substrate, a third electrode, and a fourth electrode. The third electrode is disposed on the third substrate, the fourth electrode is disposed on the fourth substrate, and the fourth electrode includes a third sub-electrode and a fourth sub-electrode, and a voltage difference exists between the third sub-electrode and the fourth sub-electrode. In addition, a liquid crystal region is also disposed between the third substrate and the fourth substrate, and the liquid crystal region includes liquid crystal molecules, which may be deflected with the voltage difference applied between the third sub-electrode and the fourth sub-electrode, and form a corresponding optical focal length.

[0018] In addition, in the direction from the central area to the peripheral area, the second lens layer may include a plurality of annular Fresnel lobes arranged in a nest. In this way, the third sub-electrode and the fourth sub-electrode may be arranged at the inner circle and the outer circle of the corresponding annular Fresnel lobe, respectively, so that a plurality of annular voltage difference areas arranged in a nest may be formed in the second lens layer, and the liquid crystal molecules of the second liquid crystal area corresponding to each annular voltage difference area may be deflected under the action of the corresponding voltage difference to form the corresponding optical focal length.

[0019] It can be understood that by changing the voltage difference applied to each annular voltage difference area, the optical focal length formed by the second liquid crystal area corresponding to each annular voltage difference area can be changed. Based on this, through reasonable design, the optical focal length formed on the second lens layer can be designed to be gradually changed in the direction from the central area to the peripheral area.

[0020] In a possible implementation of the present application, at least one annular Fresnel lobe may include a plurality of sub-annular Fresnel lobes, and the optical power of the plurality of sub-annular Fresnel lobes is the same. By further dividing the Fresnel lobe into a plurality of sub-annular Fresnel lobes, the optical power formed by the second lens layer can be made to have a continuous and gradual effect, thereby effectively reducing the generation of image jump interference of the second lens layer, which can improve the comfort of human eyes.

[0021] In addition, in the present application, the focal power of the second lens layer and the target object that the human eye is looking at can be made to be a univariate multi-time polynomial relationship function. Thus, the focal power of the second lens layer of the lens can be changed according to the change of the viewing distance of the human eye according to the univariate multi-time polynomial relationship function between the two. In this way, the second lens layer of the lens can adapt to the needs of the change of the human eye's adjustment load at different viewing distances, thereby improving the myopia prevention and control effect of the lens.

[0022] In the second aspect, the present application also provides a method for adjusting a lens, wherein the lens may include a first lens layer, and the first lens layer may include a first substrate, a second substrate, a first electrode, and a second electrode; the first electrode is arranged on the first substrate, the second electrode is arranged on the second substrate, and the second electrode includes a plurality of sub-electrode pairs. Each sub-electrode pair includes a first sub-electrode and a second sub-electrode, and the first sub-electrode or the second sub-electrode of each sub-electrode pair is connected. For each sub-electrode pair, there is a voltage difference between the first sub-electrode and the second sub-electrode. A plurality of liquid crystal regions are arranged between the first substrate and the second substrate, and the plurality of liquid crystal regions are arranged in a one-to-one correspondence with the plurality of sub-electrode pairs. In addition, each liquid crystal region includes liquid crystal molecules, and the liquid crystal molecules may be deflected with the voltage difference between the corresponding sub-electrode pairs. The method for adjusting the lens provided in the present application may include:

[0023] Obtaining the position of the gaze point of the human eye on the first lens layer;

[0024] Determine the positions of the first optical zone and the second optical zone according to the position of the gaze point on the first lens layer, wherein the gaze point is located in the first optical zone and the second optical zone is located at the periphery of the first optical zone;

[0025] Determining a liquid crystal region included in the first optical region and a liquid crystal region included in the second optical region according to positions of the first optical region and the second optical region;

[0026] The liquid crystal region in the first optical zone is controlled to form a first optical focal length, and the liquid crystal region in the second optical zone is controlled to form a second optical focal length, and the first optical focal length and the second optical focal length are different.

[0027] By adopting the lens adjustment method provided by the present application, the position of the first optical zone and the second optical zone can be determined by obtaining the position of the human eye's gaze point on the first lens layer. And by controlling the liquid crystal area of ​​the first optical zone and the liquid crystal area in the second optical zone to form corresponding optical focal lengths respectively, so that the optical focal lengths of the first optical zone and the second optical zone are different, so that when the human eye's gaze point falls on the first optical zone, clear far vision can be obtained, and the second optical zone can have a defocusing effect, so as to effectively prevent and control myopia for the human eye. In addition, the position of the human eye's gaze point on the lens can change when the human eye looks at objects under different gaze angles, which can change the liquid crystal area included in the first optical zone and the second optical zone, so that the position of the first optical zone and the second optical zone on the lens can change with the change of the position of the human eye's gaze point, so as to meet the user's personalized defocus blur tolerance needs, so as to effectively prevent and control myopia.

[0028] In a possible implementation of the present application, the lens adjustment method may further include:

[0029] Acquiring the optical power of the first optical zone;

[0030] The optical power of the second optical zone is obtained.

[0031] Since the formation of the optical focal length of the first optical zone and the second optical zone is realized by the liquid crystal region in the corresponding optical zone, the voltage difference applied to the corresponding liquid crystal region can be determined by the optical focal length of the first optical zone and the second optical zone obtained, and the voltage difference is applied to the sub-electrode pair arranged corresponding to the liquid crystal region, so that the liquid crystal molecules in the liquid crystal region are reversely deflected to form the corresponding optical focal length.

[0032] In addition, obtaining the optical power of the first optical zone and obtaining the optical power of the second optical zone may include:

[0033] Obtaining a target defocus degree and a target diopter;

[0034] determining the optical power of the first optical zone according to the target diopter;

[0035] The optical power of the second optical zone is determined according to the target defocus power.

[0036] In the present application, the target diopter may correspond to the myopia of the human eye, and the target diopter and the target defocus degree may be input into the lens through the user's setting. In this way, the optical focal length of the first optical zone may be determined according to the target diopter set by the user, and the optical focal length of the second optical zone may be determined according to the target defocus degree, so that the first optical zone and the second optical zone may form corresponding optical focal lengths respectively to meet the user's usage requirements.

[0037] In a possible implementation of the present application, the above-mentioned controlling the liquid crystal region in the first optical zone and the liquid crystal region in the second optical zone to respectively form optical focal lengths may include:

[0038] Based on the optical power of the first optical zone, determining a first voltage difference corresponding to the optical power of the first optical zone, the first voltage difference being used to deflect liquid crystal molecules in a liquid crystal region within the first optical zone;

[0039] Controlling the first sub-electrode and the second sub-electrode corresponding to the liquid crystal region in the first optical zone to apply a first voltage difference to the liquid crystal region in the first optical zone, so that the liquid crystal region in the first optical zone forms an optical focal length;

[0040] Based on the optical power of the second optical zone, determining a second voltage difference corresponding to the optical power of the second optical zone, the second voltage difference being used to deflect liquid crystal molecules in a liquid crystal region within the second optical zone;

[0041] The first sub-electrode and the second sub-electrode corresponding to the liquid crystal region in the second optical zone are controlled to apply a second voltage difference to the liquid crystal region in the second optical zone, so that the liquid crystal region in the second optical zone forms optical power.

[0042] Since the optical focal length formed by each liquid crystal region in the first optical zone and the second optical zone can be achieved by adjusting the voltage difference applied to the liquid crystal region. Based on this, by adjusting the optical focal length of the liquid crystal region in the second optical zone, the second optical zone can form a progressive defocus effect. In specific implementation, in a possible implementation of the present application, in the direction from the first optical zone to the second optical zone, a plurality of second optical focal lengths that increase in sequence can be controlled to be formed in the second optical zone. In addition, each second optical focal length in the second optical zone can be formed by one or more liquid crystal regions.

[0043] The lens provided in the present application can be applied to glasses. In addition, the glasses may further include a light source to obtain the position of the gaze point of the human eye on the first lens layer, including:

[0044] emitting a light beam toward the human eye through the light source;

[0045] Obtain the position of the bright spot formed by the light beam on the surface of the eyeball of the human eye;

[0046] Obtain the relative position between the pupil center and the bright spot;

[0047] The position of the gaze point on the first lens layer is determined according to the relative position between the pupil center and the bright spot.

[0048] Since the gaze point falls on the first optical zone of the first lens layer, the position of the first optical zone on the first lens layer can be determined by determining the position of the gaze point on the first lens layer, and the position of the second optical zone located around the first optical zone can be determined. In addition, the position of the gaze point of the human eye on the first lens layer can change when the human eye looks at objects at different gaze angles, so that the positions of the first optical zone and the second optical zone on the lens can change with the change of the position of the gaze point of the human eye, thereby meeting the user's personalized defocus blur tolerance needs and achieving an effective myopia prevention and control effect.

[0049] In addition to using the above-mentioned method based on the relative position relationship between the pupil center and the bright spot to determine the position of the gaze point on the first lens layer. In another possible implementation of the present application, the position of the gaze point on the first lens layer can also be determined by the human eye viewing distance. In specific implementation, the human eye viewing distance can be first obtained, wherein the human eye viewing distance is the distance between the human eye and the target object that the human eye is gazing at. Then, according to the human eye viewing distance, based on a preset mapping relationship, the position of the gaze point on the first lens layer is obtained. It can be understood that the mapping relationship between the human eye viewing distance and the gaze point can be stored in advance. In this way, by measuring the human eye viewing distance, the position of the gaze point on the first lens layer can be obtained according to the mapping relationship between the two, so that the position of the first optical zone on the first lens layer can be determined, and the position of the second optical zone located around the first optical zone can be determined.

[0050] In addition, the position of the human eye's gaze point on the first lens layer can change when the human eye looks at objects at different distances. In this way, the positions of the first optical zone and the second optical zone on the lens can change with the change of the position of the human eye's gaze point, thereby meeting the user's personalized defocus blur tolerance needs and achieving an effective myopia prevention and control effect.

[0051] In a possible implementation of the present application, the lens may further include a second lens layer, which may be stacked with the first lens layer. The second lens layer may be, but is not limited to, a liquid crystal lens layer, which may include a third substrate, a fourth substrate, a third electrode, and a fourth electrode. The third electrode may be disposed on the third substrate, the fourth electrode may be disposed on the fourth substrate, and the fourth electrode may include a third sub-electrode and a fourth sub-electrode, and there is a voltage difference between the third sub-electrode and the fourth sub-electrode. In addition, a liquid crystal region is also disposed between the third substrate and the fourth substrate, and the liquid crystal region includes liquid crystal molecules, which may be deflected with the voltage difference applied between the third sub-electrode and the fourth sub-electrode, and form a corresponding optical focal length. The lens adjustment method may also include:

[0052] Obtain the distance of human eye viewing, which is the distance between the human eye and the target object the human eye is looking at;

[0053] The optical power of the second lens layer is determined according to the relationship function between the viewing distance of human eyes and a univariate multi-order polynomial.

[0054] In a possible implementation of the present application, a relationship function of a univariate multi-order polynomial can be obtained by fitting multiple sets of discrete data, wherein the discrete data includes the corresponding relationship between the viewing distance of the human eye and the optical focal length.

[0055] By adopting the lens adjustment method provided by the present application, the optical power of the second lens layer of the lens can be changed according to the change of the viewing distance of the human eye according to the univariate multi-time polynomial relationship function between the two. Thus, the second lens layer can adapt to the needs of the change of the human eye adjustment load at different viewing distances, thereby improving the myopia prevention and control effect of the lens.

[0056] Since the optical power of the second lens layer can be formed by the deflection of liquid crystal molecules in the second liquid crystal region located in the second lens layer under the action of the corresponding voltage difference, therefore, in a possible implementation of the present application, the lens adjustment method may further include:

[0057] The voltage difference applied between the third sub-electrode and the fourth sub-electrode is determined according to the optical power of the second liquid crystal region.

[0058] Therefore, the liquid crystal molecules in the second liquid crystal region can be deflected under the action of the voltage difference between the third sub-electrode and the fourth sub-electrode to form corresponding optical focal length.

[0059] In a possible implementation of the present application, the lens adjustment method may further include:

[0060] Acquiring a first optical focal length and a second optical focal length, wherein the first optical focal length is a minimum optical focal length or an optical focal length with the longest duration of the first liquid crystal region in a process of reducing the optical focal length of the first liquid crystal region, and the second optical focal length is a maximum optical focal length or an optical focal length with the longest duration of the first liquid crystal region in a process of increasing the optical focal length of the first liquid crystal region, wherein the process of reducing the optical focal length of the first liquid crystal region and the process of increasing the optical focal length of the first liquid crystal region are controlled by user instructions;

[0061] A half of the sum of the first optical focal length and the second optical focal length is obtained, and a half of the sum of the first optical focal length and the second optical focal length is used as the optical focal length of the second liquid crystal region.

[0062] In this way, the optical focal length of the second lens layer of the lens can be adjusted for different presbyopic patients to meet the patients' eye needs in different close-up scenes, thereby improving the accommodation power of the eyes of presbyopic patients.

[0063] In a third aspect, the present application further provides a control device, which may include a processor and a memory. The memory stores a program code, and when the program code is executed by the processor, the method described in the second aspect can be implemented. The positions of the first optical zone and the second optical zone on the lens change with the position of the gaze point of the human eye, thereby meeting the user's personalized defocus blur tolerance requirements and achieving an effective myopia prevention and control effect.

[0064] In a fourth aspect, the present application provides a pair of glasses, which includes the lens of the first aspect. In the glasses provided by the present application, as the position of the human eye's gaze point on the lens of the glasses changes, the liquid crystal area included in the first optical zone and the second optical zone changes, so that the position of the first optical zone and the second optical zone changes accordingly, so that the personalized defocus blur tolerance requirements of the user can be met, so as to achieve an effective myopia prevention and control effect.

[0065] In the present application, the glasses may include the control device of the third aspect, which may be used to control the optical power of the first optical zone and the second optical zone to achieve the purpose of controlling the optical power of the two optical zones.

[0066] In order to enable power-consuming devices such as control devices to operate normally, the glasses provided in the present application may also include a battery, which can provide power for the control process of the control device.

[0067] In a possible implementation of the present application, the above-mentioned glasses may further include a frame and temples, and the above-mentioned lenses may be connected to the frame and the temples.

[0068] In a possible implementation of the present application, the lens may further include a third lens layer, which may be a liquid crystal lens layer, and the first lens layer and the third lens layer may be stacked. In addition, in the direction from the central area to the peripheral area, the third lens layer may include a plurality of strip-shaped Fresnel lobes, and the third lens layer may form a cylindrical liquid crystal lens, which may be used to correct human eye astigmatism.

[0069] In addition, in the present application, at least one strip-shaped Fresnel lobe may include a plurality of sub-strip-shaped Fresnel lobes, and the optical power of the plurality of sub-strip-shaped Fresnel lobes may be the same. Since the electrode spacing between two adjacent strip-shaped sub-Fresnel lobes after segmentation is reduced, the third lens layer as a whole may form a parabola-like electric field distribution curve, and its imaging quality may be significantly improved.

[0070] In addition to the above structure, the glasses provided by the present application may also include a light source and a gaze angle measurement sensor. The light source and the gaze angle measurement sensor may be arranged on the frame. The light source may be used to emit a light beam to the human eye, and the gaze angle measurement sensor may be used to obtain the position of the bright spot formed by the light beam on the surface of the eyeball of the human eye, and the relative position between the pupil center and the bright spot.

[0071] In the present application, in order to obtain the viewing distance of the human eye, the glasses may further include a distance measuring sensor, which may be, but is not limited to, disposed on the frame of the glasses, so as to measure the viewing distance of the human eye through the distance measuring sensor.

[0072] In addition, the glasses may also include a battery, which can supply power to power-consuming devices on the glasses, such as a light source, a gaze angle measurement sensor, a distance measurement sensor or a control device, so as to ensure the normal operation of these devices.

[0073] In a fifth aspect, the present application further provides a computer program, which, when executed on a computer, enables the computer to execute the method described in the second aspect, so that the positions of the first optical zone and the second optical zone on the lens change with the position of the gaze point of the human eye, thereby satisfying the personalized defocus blur tolerance requirements of the user and achieving an effective myopia prevention and control effect.

[0074] In a sixth aspect, the present application further provides a computer-readable storage medium, the computer-readable storage medium comprising a program, which, when executed on a computer, enables the computer to execute the method described in the second aspect, so that the positions of the first optical zone and the second optical zone on the lens change with the position of the gaze point of the human eye, thereby satisfying the personalized defocus blur tolerance requirements of the user, and achieving an effective myopia prevention and control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] Figure 1aA schematic diagram of an eye's vision before correction provided in an embodiment of the present application;

[0076] Figure 1b A schematic diagram of an eye's vision after correction with a single vision lens provided in an embodiment of the present application;

[0077] Figure 1c A schematic diagram of a better corrected eye's vision according to an embodiment of the present application;

[0078] Figure 2a A schematic diagram of the close-up eye gaze viewing angle provided by an embodiment of the present application is shown;

[0079] Figure 2b A schematic diagram of the close-up eye viewing angle provided by another embodiment of the present application is shown;

[0080] Figure 3a A schematic diagram of an application scenario of a lens provided in an embodiment of the present application;

[0081] Figure 3b for Figure 3a A side view of the lens shown;

[0082] Figure 4 A schematic diagram of the structure of a lens provided in one embodiment of the present application;

[0083] Figure 5 A schematic diagram of a zoom region of a lens provided in an embodiment of the present application;

[0084] Figure 6 A schematic diagram of a pupil center-bright spot center vector provided in an embodiment of the present application;

[0085] Figure 7 A flow chart of a lens adjustment method provided in one embodiment of the present application;

[0086] Figure 8a It is the position where the line of sight passes through the lens when the human eye looks straight ahead;

[0087] Figure 8b It is the position where the line of sight of the human eye passes through the lens when reading at close range;

[0088] Fig. 9 A schematic diagram of a partial structure of glasses according to a possible embodiment of the present application;

[0089] Fig.10 A schematic diagram of the structure of a lens provided in one embodiment of the present application;

[0090] Fig.11 A schematic diagram of the structure of a lens provided in another embodiment of the present application;

[0091] Fig.12aThe structure of a solid concave lens provided in one embodiment of the present application;

[0092] Figure 12b A schematic diagram of changes in the optical power of different regions of a liquid crystal lens provided in an embodiment of the present application;

[0093] Fig.12c A schematic diagram of the structure of a second lens layer provided in one embodiment of the present application;

[0094] Fig.13 for Fig.12c A cross-sectional view of the potential distribution of the second lens layer shown in ;

[0095] Fig.14 A schematic diagram of the structure of a second lens layer provided in another embodiment of the present application;

[0096] Fig.15 A schematic diagram of the structure of a lens provided in another embodiment of the present application;

[0097] Fig.16 A schematic structural diagram of a second lens layer provided in another embodiment of the present application.

[0098] Reference numerals:

[0099] 1-retina; 2-frame; 201-mounting hole; 3-lens; 3a-first lens layer;

[0100] 301a-first substrate; 301b-second substrate; 302-liquid crystal layer; 3021-liquid crystal region; 303a-first electrode;

[0101] 303b - second electrode; 3031 - sub-electrode pair; 3031a - first sub-electrode; 3031b - second sub-electrode; 304 - driving device;

[0102] 305- fixation point; 4- temple; 5- battery; 6- pupil; 7- cornea; 701- bright spot; 8- camera; 9- light source;

[0103] 10-second lens layer; 1001-first surface; 1002-second surface; 1003-third substrate; 1004-fourth substrate;

[0104] 1005- liquid crystal layer; 1006- optical liquid; 1007- baffle; 1008- solid-state lens; 10081- curved surface; 11- distance sensor. DETAILED DESCRIPTION

[0105] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0106] Myopia is a common eye disease. Myopia refers to the symptom that the eyes cannot see distant objects clearly but can see nearby objects clearly. This is because under the premise of static refraction, distant objects cannot converge on the retina, but form a focus in front of the retina, thus causing visual distortion and making distant objects blurry. Myopia is divided into two categories: refractive and axial. The cause of myopia is mostly due to the excessive length of the front-to-back axis of the eyeball (called axial myopia), followed by a strong refractive power of the eye (called curvature myopia).

[0107] At present, the most commonly used method for myopia is to wear myopia glasses. The lens of myopia glasses is a negative lens. The central area of ​​the negative lens is thin, while the edge area is thicker, and it has the ability to diverge light. After wearing myopia glasses, distant objects can be converged on the retina, which solves the problem of far vision. However, when reading and writing at close range, the lens of myopia glasses makes the focus of the object image move further back relative to the retina, which just increases the burden of close-range eye use, which will lead to the aggravation of myopia development, thereby causing further decline in vision. After the vision declines, in order to meet the imaging requirements of distant objects on the retina, it is necessary to replace myopia lenses with higher degrees. This has caused a vicious cycle of declining vision and continuous replacement of glasses, especially for young students with strong accommodation. From the above analysis, it can be seen that after myopia, wearing myopia glasses can only play a role in correcting vision, and cannot effectively control the further development of myopia.

[0108] At present, there are many methods for correcting myopia, but each method has its own insurmountable defects. For example, laser surgery cannot control the development of myopia, and is not suitable for children with rapid myopia progression. Corneal contact lenses have the risk of corneal infection, and because they need to be replaced frequently, the cost of long-term wear is relatively expensive. In addition, drug treatment methods have significant side effects.

[0109] The peripheral defocus theory is a cause of myopia proposed by a professor of ophthalmology at an American university at the end of the last century. In order to understand the peripheral defocus theory, several related terms are explained first. Among them, focal length is a measurement method for measuring the convergence or divergence of light in an optical system. It refers to the distance from the optical center of the lens to the focus of light when parallel light is incident. Optical power: also known as diopter, is the reciprocal of focal length. It is a unit used to measure the refractive power of a lens or curved mirror. Its unit is D. When the focal length is 1m, the optical power is 1D, that is, 1m -1; The focal length is 2m when the optical power is 0.5D, and so on. Ordinary glasses often use degrees, and the value of the diopter D multiplied by 100 is the degree. For example, -1.0D is equal to 100 degrees of myopia lens (concave lens), and +1.0D is equal to 100 degrees of presbyopia lens (convex lens). Peripheral defocus: The image of the object in the center of the lens is projected on the retina, and the image of the object in the peripheral part of the lens is projected in front of or behind the retina. The projection in the front is called myopic defocus, and the projection in the back is hyperopic defocus. Peripheral hyperopic defocus will stimulate the growth of the eye axis, and the lengthening of the eye axis will lead to the worsening of myopia. Generally, the eye axis grows by 1mm, and the myopia degree increases by about 300 degrees.

[0110] Reference Figure 1a , Figure 1a A schematic diagram of an eye's vision before correction is shown in one embodiment of the present application. Figure 1a The dotted line in the figure indicates the imaging position of the object. Figure 1a It can be seen that before correction, the images of objects in the central vision and some peripheral areas are projected in front of the retina 1. In order to correct myopia, the main purpose of traditional single-vision lenses is to solve the wearer's need to see far away clearly, and can only correct the defocus of the central macular area of ​​the eye. Figure 1b , Figure 1b This is a schematic diagram of an eye's vision after correction with a single vision lens, showing an embodiment of the present application. After correction, the image of the object in the central vision can be projected onto the retina 1, while the image of the object in the peripheral area is projected behind the retina 1, forming hyperopic defocus. Hyperopic defocus will stimulate the growth of the eye axis to lengthen, promoting the continuous increase of myopia.

[0111] Reference Figure 1c , Figure 1c A schematic diagram of a better corrected eye is shown. Figure 1cIn order to achieve the correction effect shown, some eyewear manufacturers have launched defocus myopia prevention and control glasses. One type of defocus myopia prevention and control glasses is designed with a concentric bifocal design, which includes two corrective optical zones and two therapeutic optical zones, a total of four concentric optical zones, from the central area to the peripheral area, respectively recorded as the first optical zone, the second optical zone, the third optical zone and the fourth optical zone. Among them, the first optical zone and the third optical zone have the same degree, and their function is to correct the degree of myopia. The second optical zone and the fourth optical zone increase the optical power of +2D on the basis of correcting the degree of myopia, thereby forming myopic defocus on the retina 1, achieving the effect of slowing down the deepening of myopia. Another type of defocus myopia prevention and control glasses adopts an asymmetric design with a geometric center, which is wide horizontally and narrow vertically, and has a rhombus-like shape with the lower side tilted inward toward the nasal side. The peripheral progressive positive optical power is added, and the maximum optical power is added by about +2D. There is also a type of defocused myopia prevention and control glasses that uses a rotationally symmetrical design. The geometric center with a radius of approximately 4.7mm is a stable distance refractive correction area, and the surrounding radius range of 4.7 to 16.5mm is a circular honeycomb design, with 396 +3.5D micro-convex lenses added to form a defocus area.

[0112] The lenses of traditional peripheral defocus myopia glasses are usually divided into a central optical zone and a peripheral defocus zone. When fitting, they are designed based on the eyeball looking straight ahead and the line of sight passing through the central optical zone of the lens. The central optical zone uses the myopia degree of the user's refractive examination to correct the myopia degree and ensure the user's clear distance vision. A certain amount of light is added to the peripheral defocus zone (additional positive focal power) so that the light passing through the peripheral defocus zone converges in advance, forming myopic defocus and preventing the development of myopia.

[0113] However, the central optical zone and peripheral defocus areas of these defocused myopia prevention and control glasses are fixed and cannot change with the rotation of the eyeball, so they are not suitable for eye use scenarios under different gaze angles. In real life scenarios, when we look in all directions, our eyeballs will continue to rotate, so the gaze of the eyeball does not necessarily look out from the optical center of the lens. For example, when reading at close range, binocular single vision will be formed, and the two eyes will produce convergence and downward rotation movements. The size of the angle of eyeball rotation is related to the viewing distance and the pupil distance. The smaller the viewing distance and the larger the pupil distance, the larger the angle of rotation; the larger the viewing distance and the smaller the pupil distance, the smaller the angle of rotation.

[0114] Moreover, the reading habits of different individuals vary greatly, depending on age, heterophoria, head position when reading, reading distance, etc. In addition, the functions of head or eye rotation are different for different individuals. Figure 2a , Figure 2a The diagram shows a schematic diagram of the close-up eye viewing angle provided by an embodiment of the present application. Figure 2aAs shown, when a person who is used to turning his head looks at a peripheral target, he will turn his head to make the gaze point 305 fall on the target (that is, the head tilt angle α is large, for example, greater than 30°; and the eyeball rotation amplitude β is small, for example, within 10°). Figure 2b , Figure 2b A schematic diagram of the close-up eye gaze viewing angle provided by another embodiment of the present application is shown. Figure 2b As shown, people who are used to moving their eyes will move their eyeballs to make the fixation point 305 fall on the target (that is, the head tilt angle α is small, for example, within 10°; and the amplitude β of the eyeball rotation is large, for example, more than 20°). For these two types, the total movement amplitude of the head and eyeballs is equivalent to the position of the peripheral fixation target. Researchers in this field compared the gaze angles of children with orthotropia, exotropia and esotropia wearing single-light glasses and progressive lenses. The study found that children with exotropia have a small gaze angle when reading, while children with esotropia have a large gaze angle when reading. This trend will increase significantly when wearing progressive multifocal lenses. A large gaze angle means that the position of the line of sight through the lens when looking close deviates from the central optical center.

[0115] In addition, different individuals have different tolerances to defocus blur. The fixed-position peripheral defocus design causes some users to feel uncomfortable after fitting the glasses, but the lenses cannot be adjusted to compensate after polishing. In addition, the degree of myopia in adolescents is an irreversible process. Although peripheral defocus can delay the progression of myopia, it cannot curb the development of myopia. As the eye axis grows and myopia deepens, the defocus glasses that were once worn are no longer suitable for both the central optical zone and the defocus area, resulting in frequent glasses fitting.

[0116] The lens provided by the present application aims to solve the above-mentioned problem. The position of the defocus area of ​​the lens can be flexibly adjusted so that the position of the defocus area can change with the position of the user's gaze point, thereby meeting the user's personalized defocus blur tolerance needs and playing an effective role in myopia prevention and control. In the present application, the central area of ​​the lens can be understood as the gaze area on the lens where the user's gaze point falls when looking far away; and the peripheral area can be understood as the area located on the periphery of the central area.

[0117] It is worth mentioning that the glasses provided by the present application and having the above-mentioned lenses applied thereto can be applied to a variety of scenarios, such as indoor scenarios such as reading or working, or outdoor scenarios such as sightseeing, walking or cycling. In addition, the glasses provided by the present application and having the lenses applied thereto can not only realize the function of myopia glasses, but also integrate some functional modules for realizing human-computer interaction, forming, for example, virtual reality (VR) smart glasses or augmented reality (AR) smart glasses, etc., thereby meeting the use requirements of some patients with myopia for some human-computer interaction scenarios.

[0118] The terms used in the following embodiments are only for the purpose of describing specific embodiments, and are not intended to be used as limitations on the present application. As used in the specification and the appended claims of the present application, the singular expressions "one", "a kind of", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the following embodiments of the present application, "at least one", "one or more" refer to one, two or more. The term "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0119] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0120] Reference Figure 3a , Figure 3a This is a schematic diagram of an application scenario of the lens 3 provided in an embodiment of the present application. Figure 3a The embodiment shown shows a structure of glasses, which may include a frame 2 and a lens 3. The lens 3 is fixed to the frame 2. In order to facilitate wearing of the glasses, refer to Figure 3b , Figure 3b Shown Figure 3a The glasses are usually also provided with temples 4, to which the lenses 3 can also be fixedly connected.

[0121] In addition, Figure 3aIn the illustrated embodiment, the mirror frame 2 may have two mounting holes 201, and the two mounting holes 201 may be symmetrically arranged. In this embodiment, the temple 4 may be fixed to the mirror frame 2 so that the lens 3 is connected to the temple 4 in an indirect manner. In addition, there are two lenses 3, and the two lenses 3 are mounted in the two mounting holes 201 of the mirror frame 2 in a one-to-one correspondence. The shape of the lens 3 may be, but is not limited to, regular shapes such as circular and square, or may be some possible irregular shapes to increase the diversity of the shape of the lens 3, thereby increasing the selectivity of the user and improving the user experience. In some other embodiments of the present application, the mirror frame 2 may also be a connector arranged between the two lenses 3, and the temple 4 may be directly fixedly connected to the lens 3.

[0122] In the present application, the lens 3 includes at least one lens layer, for example, a first lens layer 3a. Figure 4 , Figure 4 The schematic diagram of the structure of the first lens layer 3a provided by a possible embodiment of the present application is shown. Figure 4 In the illustrated embodiment, the first lens layer 3a is a liquid crystal lens, and the first lens layer 3a may include a first substrate 301a, a second substrate 301b, a liquid crystal layer 302, a first electrode 303a, and a second electrode 303b. The first electrode 303a is disposed on the first substrate 301a, the second electrode 303b is disposed on the second substrate 301b, and the liquid crystal layer 302 is located between the first substrate 301a and the second substrate 301b.

[0123] It is understandable that the lens 3 has a high requirement for light transmittance. In the present application, the material of the first lens layer 3a can be selected as a transparent material. Exemplarily, the first substrate 301a and the second substrate 301b can be made of transparent materials such as, but not limited to, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), polydimethylsiloxane (PDMS), etc. In addition, the first electrode 303a and the second electrode 303b can be transparent conductive electrodes, and their materials can be, for example, transparent conductive oxide TCO, such as indium tin oxide (ITO); or, conductive polymers, metal nanowires, metal grids, graphene, carbon nanotubes, metals or alloys or metal oxides, etc.

[0124] You can continue to refer to Figure 4 In the present application, the voltage applied to the first electrode 303a and the second electrode 303b can generate a corresponding electric field between the first substrate 301a and the second substrate 301b. Figure 4In the embodiment shown, when different voltages are applied to different regions of the first lens layer 3a, voltage differences and electric field gradient distributions can be formed in different regions. The electric field can act on the liquid crystal layer 302, and the liquid crystal molecules in different regions of the liquid crystal layer 302 can be adaptively deflected under the action of the corresponding electric field. For example, the electric field in the central region of the lens can be smaller, while the electric field in the peripheral region can be larger. The deflection angle of the liquid crystal molecules in the region with a larger electric field is larger, thereby forming a curve distribution in which the deflection angle of the liquid crystal molecules in the peripheral region is larger and the deflection angle of the liquid crystal molecules in the central region is smaller (such as Figure 4 ).

[0125] Since the voltage difference (voltage amplitude) mainly affects the changing trend of the voltage distribution, and the voltage frequency mainly affects the flatness of the voltage distribution, the combination and interaction of the voltage difference and the voltage frequency determine the actual voltage difference and distribution of the liquid crystal lens. According to the applied voltage difference and voltage frequency, different electric field distributions of the liquid crystal layer 302 are formed, and the liquid crystal molecules form different curve deflection distributions accordingly. Different areas constituting the first lens layer 3a have different curvature distributions, thereby forming different optical powers. The maximum optical power that the liquid crystal molecules can be arranged to form is Limited by the material properties of the liquid crystal molecules (birefringence Δn), the thickness d of the liquid crystal layer 302 and the lens aperture radius r:

[0126]

[0127] In a specific application scenario, the material properties of the liquid crystal molecules, the thickness of the liquid crystal layer 302 and the lens aperture are known, and the optical focal length can be adjusted within the above-mentioned limit range by controlling the voltage amplitude and frequency.

[0128] Based on this, in the present application, the liquid crystal layer 302 may include a plurality of liquid crystal regions 3021 to form a liquid crystal sub-lens array in the first lens layer 3a. In the present application, the outline shape of the liquid crystal region 3021 is not limited, and it may be a regular shape such as a circle or a rectangle, or may be some possible irregular shapes. In this way, the voltage amplitude and the voltage frequency may be set for each liquid crystal region 3021, so that the optical focal length of each liquid crystal region 3021 can be independently controlled. In the specific implementation, reference may be made to Figure 5 , Figure 5A schematic diagram of the zoom area of ​​the first lens layer 3a of an embodiment of the present application is shown. In the present application, the second electrode 303b may include a plurality of sub-electrode pairs 3031, and the plurality of sub-electrode pairs 3031 are arranged in a one-to-one correspondence with the plurality of liquid crystal regions 3021. In addition, each sub-electrode pair 3031 includes a first sub-electrode 3031a and a second sub-electrode 3031b. The second sub-electrode 3031b is arranged as a ring electrode, and a voltage difference may be formed between the first sub-electrode 3031a and the second sub-electrode 3031b to form a pressure difference area between the first sub-electrode 3031a and the second sub-electrode 3031b. The second sub-electrode 3031b may be arranged corresponding to the edge of the liquid crystal region 3021, so that the projection of each liquid crystal region 3021 on the second substrate 301b falls within the area surrounded by a second sub-electrode 3031b, so that the voltage difference and voltage frequency applied to the sub-electrode pair 3031 can act on the corresponding liquid crystal region 3021.

[0129] In addition, please refer to Figure 5 The second sub-electrodes 3031b of each sub-electrode pair 3031 are connected to serve as a common power supply electrode V base , and the first sub-electrode 3031a of each sub-electrode pair 3031 is an independent electrode V1, V2, V3, ..., V n . In this way, the voltage applied to each sub-electrode pair 3031 can be adjusted independently by adjusting the voltage applied to the first sub-electrode 3031a of each sub-electrode pair 3031, so that the liquid crystal molecules in the corresponding liquid crystal region 3021 are adaptively deflected to form a corresponding optical focal length in the liquid crystal region 3021. It can be understood that in some possible embodiments of the present application, the first sub-electrodes 3031a of each sub-electrode pair 3031 can also be connected to serve as a common power supply electrode, while the second sub-electrode 3031b of each sub-electrode pair 3031 is an independent electrode, which can also independently adjust the voltage difference in each sub-electrode pair 3031. Alternatively, in some embodiments, the first sub-electrode 3031a and the second sub-electrode 3031b of each sub-electrode pair 3031 can be controlled separately to improve the control flexibility of each sub-electrode pair 3031.

[0130] It is worth mentioning that since the liquid crystal molecules need to be above a certain voltage threshold to respond to the electric field and deflect, in this application, the following can be given: Figure 4 The first electrode 303a on the first substrate 301a shown in the figure applies a basic voltage to raise the electric field voltage between the first substrate 301a and the second substrate 301b as a whole, so that the liquid crystal molecules work above the critical voltage. Taking the positive liquid crystal material as an example, the common power supply electrode V baseThe voltage on the first electrode 303a is 1V, and the voltage applied to the first substrate 301a is 0V. The liquid crystal molecules are just under the action of the critical voltage. Figure 5 When a voltage higher than 1V is applied to the first sub-electrode 3031a of each sub-electrode pair 3031, the liquid crystal molecules begin to deflect to form a corresponding optical focal length. Because the deflection direction and deflection angle of the liquid crystal molecules are different under the action of different voltage differences applied to the corresponding sub-electrode pairs 3031, the optical focal length formed in different liquid crystal regions 3021 can be adjusted by adjusting the voltage applied to the first sub-electrode 3031a of different sub-electrode pairs 3031.

[0131] It can be understood that, in order to apply corresponding voltages to the first sub-electrodes 3031a of different sub-electrode pairs 3031 of the first lens layer 3a, in some embodiments of the present application, a driving device 304 can be provided for the first lens layer 3a. When the lens provided by the present application is used in glasses, the driving device 304 can be provided, but is not limited to, in the following places: Figure 3b In the temple 4 of the glasses shown, the internal space of each part of the glasses can be reasonably used. In some other possible implementations, the driving device 304 can also be arranged in the frame 2 of the glasses. In the embodiment of the present application, the driving device 304 can be a voltage conversion unit, such as a resistance voltage generator, a pulse width modulation, etc., so as to meet different voltage requirements of the first sub-electrode 3031a.

[0132] When the lens 3 provided in the present application is applied to glasses, a control device can be provided in the glasses, and the control device can be provided in Figure 3a In the mirror frame 2 shown, it can also be arranged as follows Figure 3b The control device can be used to control the working process of the above-mentioned driving device 304, so as to adjust the voltage applied to each liquid crystal area 3021, so that each liquid crystal area 3021 forms a corresponding optical focal length. In some embodiments of the present application, the control device may include a processor and a memory. Among them, the processor can be used to obtain the myopia degree and defocus degree set by the user, and control the above-mentioned driving device 304 to start according to the obtained myopia degree and defocus degree, so as to apply a corresponding voltage to the first sub-electrode 3031a of the different sub-electrode pairs 3031 of the first lens layer 3a. In addition, the memory can be used to store the myopia degree and defocus degree obtained by the above-mentioned processor. In the present application, the memory can use any possible form of computer-readable memory, which can be but not limited to electrically erasable programmable read-only memory (EEPROM) and hard disk drive, etc.

[0133] You can continue to refer to Figure 3a and Figure 3b The glasses may also include a battery 5, which may be arranged in a Figure 3a In the mirror frame 2 shown, it can also be arranged as follows Figure 3b The battery 5 can be used as a power source for the driving device 304 and the possible power-consuming devices in the glasses, such as the control device. In addition, in the present application, the battery 5 can be detachably connected to the frame 2 or the temple 4 of the glasses, so that the battery 5 can be replaced in time, thereby avoiding affecting the normal use of the glasses.

[0134] Since the optical focal length formed in different liquid crystal regions 3021 can be adjusted in the present application, the different liquid crystal regions 3021 can be numbered, and the correspondence between the optical focal length of the liquid crystal regions 3021 with different numbers and the voltage difference and voltage frequency applied to each sub-electrode pair 3031 can be formed into a search table or curve. For example, reference can be made to Table 1, which is a search table for the correspondence between the optical focal length of the liquid crystal region 3021 and the voltage difference and voltage frequency applied to the corresponding sub-electrode pair 3031 provided in a possible embodiment of the present application. The search table can be pre-stored in the above-mentioned memory.

[0135] Table 1

[0136] The focal power of the lens The voltage difference between the first sub-electrode 3031a and the second sub-electrode 3031b Voltage frequency *** *** *** *** *** *** *** *** *** *** *** ***

[0137] In addition, in the present application, a gaze angle measurement sensor may be provided for the first lens layer 3a, and the gaze angle measurement sensor may be provided on the frame 2 of the glasses. In addition, the gaze angle measurement sensor may be made based on, but not limited to, the principle of eye tracking technology such as electrooculographic recording method, electromagnetic induction method, image / video analysis method, and pupil-corneal reflection method. In this way, the position of the gaze point on the first lens layer 3a may be obtained by recording the positioning and movement of the eye.

[0138] Taking the pupil-corneal reflection method as an example, you can refer to Figure 6 , Figure 6 Schematic diagram of pupil center-bright spot center vector. A light source 9 (e.g., infrared light source) disposed on the frame 2 of the glasses is used to emit a light beam to the eyeball, and the light beam generates a bright spot 701 on the surface of the cornea 7. Then, a camera 8 is used to obtain an eye image, thereby obtaining the coordinates of the center of the pupil 6 and the center of the bright spot 701, that is, the center of the pupil 6-the center of the bright spot 701 vector. This vector changes with the direction of the pupil 6 line of sight. Figure 6As shown, multiple light sources 9 can form bright spots 701 centers at more different positions, forming a human eye plane coordinate system, which can better locate the relative position of the center of the pupil 6. On this basis, with the help of environmental calibration coordinate data, the position of the gaze point 305 of the line of sight on the plane coordinate system of the first lens layer 3a can be calculated.

[0139] In the actual application system, the environmental calibration coordinate data is known, including the distance between the first lens layer 3a and the human eye, the inclination angle of the first lens layer 3a relative to the surface of the human eye, and the position of the center of each bright spot 701, so that the coordinates of the center of the pupil 6 and the coordinates of the gaze point 305 on the lens can be mapped. In view of the fact that the adjustable peripheral defocus area of ​​the present application only uses the sight gaze point 305 to identify the position of the first optical zone, wherein the first optical zone refers to the area where the gaze point 305 of the human eye on the first lens layer 3a is located, which can also be called the optical central zone. The diameter of the first optical zone is often greater than 9 mm. Such a wide diameter range reduces the accuracy requirements of the sight gaze point 305. Therefore, the center of the pupil 6 can be taken as a discrete value and corrected in advance to form a data retrieval table. Referring to Table 2, Table 2 is a data retrieval table for the mapping relationship between the center of the pupil 6 and the gaze point 305 provided in an embodiment of the present application. The data retrieval table can be stored in the memory, so that after the camera 8 obtains the pupil 6 center coordinate data, the processor can retrieve the data retrieval table to obtain the coordinates of the closest gaze point 305 on the first lens layer 3a, thus completing the measurement of the gaze point.

[0140] Table 2

[0141] Pupil 6 center coordinate x Pupil 6 center coordinate y The gaze point 305 is at the coordinate x of the lens The gazing point 305 is at the coordinate y of the lens *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

[0142] Since in actual applications, the position and shape of each liquid crystal region 3021 in the first lens layer 3a are known, and the coordinate range of the points it contains is also determined, these parameters are preset when the first lens layer 3a is formed, refer to Table 3, which is a position and shape information retrieval table of each liquid crystal region 3021 of the first lens layer 3a provided in an embodiment of the present application. The retrieval table can be stored in a memory.

[0143] Table 3

[0144]

[0145]

[0146] Simplifying the shape of the liquid crystal region 3021 as a circle, the center coordinates of which are known to be (a, b), then the distance from each point on the circle to the center is equal to the radius r of the circle, and thus:

[0147]

[0148] The distance from each point in the circle to the center is less than the radius of the circle:

[0149]

[0150] On this basis, the coordinates of each gaze point 305 measured by the gaze angle measurement sensor on the first lens layer 3a can be compared with the distance between the center of each liquid crystal area 3021 in turn. If it is less than or equal to the radius of the circle, the number of the liquid crystal area 3021 where the coordinates of the gaze point 305 are located can be identified, and those liquid crystal areas 3021 that meet the above conditions are identified as being in the first optical zone, while the other liquid crystal areas 3021 are identified as being in the second optical zone. The second optical zone is located at the periphery of the first optical zone and can also be called the peripheral area.

[0151] In addition, the processor can adjust the optical focal length of the liquid crystal area 3021 included in the first optical zone to the user's myopia degree to ensure the user's clear distance vision ability, and add positive optical focal length to the liquid crystal area 3021 included in the second optical zone based on the user's myopia degree to form a myopic defocus and myopia prevention and control effect.

[0152] After introducing the zoom principle of the above-mentioned lens of the present application, Figure 7 The method for adjusting the position of the defocused area of ​​the lens 3 when it is used in glasses is described below. Figure 7 A flow chart of a method for adjusting the lens 3 provided for a possible embodiment of the present application.

[0153] Step 1, setting the focal power of the first optical zone and the second optical zone of the first lens layer 3a of the lens 3. Among them, the focal power of the first optical zone corresponds to the myopia degree of the human eye, and the focal power of the second optical zone corresponds to the defocus degree. In the present application, different setting methods of myopia degree and defocus degree can be set according to different application scenarios. Exemplarily, in a possible embodiment of the present application, the setting of the myopia degree and defocus degree of the first lens layer 3a of the lens 3 can be achieved through the active setting of the user. In specific implementation, a wireless (such as Bluetooth) connection path can be established between the application software on an external terminal device such as a mobile phone and the lens of the glasses, so that the user can set the myopia degree and defocus degree through the application software. When the processor of the lens receives the setting command of the myopia degree (diopter) and defocus degree transmitted from the external terminal device, the diopter and defocus degree can be converted into the corresponding focal power. Among them, the relationship between the optical power and the diopter or defocus degree of ordinary optometry is: optical power = (diopter or defocus degree) / 100.

[0154] In another possible embodiment of the present application, an intelligent sensing module can be provided on the glasses to obtain the displacement between the imaging of each point of the retina 1 and the ideal imaging through the intelligent sensing module, and convert it into the degree of myopia and the degree of defocus, so as to realize the self-setting of the glasses. In addition, the intelligent sensing module can use any possible ray tracing sensor, including but not limited to Shack-Hartmann wavefront sensor and Tscherning sensor, etc.

[0155] Step 2, determine the position of the gaze point on the first lens layer through the gaze angle measurement sensor. Since the gaze point is located in the first optical zone, the positions of the first optical zone and the second optical zone can be determined according to the position of the gaze point on the first lens layer, and the second optical zone is located around the first optical zone. In addition, after the positions of the first optical zone and the second optical zone are determined, the number of the liquid crystal area 3021 included in the first optical zone and the number of the liquid crystal area 3021 included in the second optical zone can be determined. Among them, the optical focal length of the liquid crystal area 3021 located in the first optical zone can correspond to the degree of myopia. In addition, the optical focal length of the liquid crystal area 3021 located in the second optical zone is superimposed with the defocus degree on the basis of the corresponding degree of myopia, and the second optical zone is used as a defocus area.

[0156] It is understandable that in the present application, the position of the first optical zone can change with the change of the position of the gaze point, and the position of the defocus area will also change adaptively with the change of the position of the gaze point, so that the visual axis of the human eye passes through the first optical zone as much as possible, so as to better ensure sufficiently clear far vision and peripheral defocus effect. In addition, since the human eye has the ability to adapt to the pupil distance, and the pupil distance of different individuals is different, the lens 3 provided by the present application can be used to dynamically adjust the position of the defocus area of ​​the first lens layer 3a of the lens 3 to achieve the movement and adjustment of the central area of ​​the entire lens 3, thereby meeting the personalized needs of different positions of the optical central area of ​​the lens 3 caused by the diverse pupil distances of users.

[0157] In addition, in the present application, since there may be gaps between the various liquid crystal regions of the first lens layer 3a, and the optical focal length at the gap is 0. Based on this, the optical focal lengths of the various liquid crystal regions located in the first optical zone can be set to 0, so that the optical focal lengths of the first optical zone can be consistent, so that the first optical zone can provide a clear visual effect. For the second optical zone, its defocus degree can be changed according to the user's settings. In the present application, the optical focal length of the second optical zone of the first lens layer 3a of the lens 3 can also be gradually changed from the central area to the peripheral area. In specific implementation, with the gazing point 305 at the coordinates (a, b) of the lens as the center, the defocus degree of the liquid crystal region 3021 farthest from the gazing point 305 is the largest, and the distance between each liquid crystal region 3021 on the lens and the gazing point 305 can be calculated. Still taking the first optical zone as having a radius of 9 mm as an example, the focal length of the liquid crystal region 3021 farthest from the first optical zone is the defocus degree, and the distance between the center coordinate (x, y) of the liquid crystal region 3021 located in the first optical zone and the gaze point 305 satisfies:

[0158]

[0159] The liquid crystal region 3021 that meets this condition is identified as being in the first optical zone, and its optical power corresponds to the degree of myopia.

[0160] In this way, the distance R between the farthest liquid crystal area 3021 and the gaze point 305 is traversed. max , the focal power of the farthest liquid crystal region 3021 is the defocus degree D, then the focal power φ of each liquid crystal region 3021 in the optical peripheral region and the distance from the gaze point 305 may be linearly and gradually increased, and then:

[0161]

[0162] By gradually increasing the defocus power of the first lens layer 3a of the lens 3 from the central area to the peripheral area, the image jump interference caused by the large difference in refractive power of adjacent parts of the second optical zone of the first lens layer 3a of the lens 3 can be reduced, thereby improving the user comfort.

[0163] It can be understood that in the present application, the defocus degree of the first lens layer 3a gradually increases in the direction from the central area to the peripheral area, that is, the optical focal length of the second optical zone of the first lens layer 3a gradually increases in the direction from the central area to the peripheral area. The gradually increasing optical focal length in the second optical zone can be achieved by adjusting the optical focal length formed by each first liquid crystal region in the second optical zone. In specific implementation, each first liquid crystal region in the second optical zone can form an optical focal length, and the optical focal lengths formed by each first liquid crystal region can be the same or different. In this way, in the direction from the first optical zone to the second optical zone, the optical focal length of the first liquid crystal region in the second optical zone can be gradually increased, thereby achieving a gradually increasing optical focal length in the second optical zone.

[0164] In the third step, the processor retrieves the corresponding control voltage amplitude and voltage frequency from the memory according to the optical focal length of each liquid crystal area 3021 located in the first optical zone and the second optical zone, and transmits them to the voltage conversion unit corresponding to each liquid crystal area 3021, so that the voltage conversion unit outputs a voltage signal of a corresponding frequency, so that the liquid crystal areas 3021 located in the first optical zone and the second optical zone form a preset optical focal length.

[0165] By using the lens adjustment method provided in this embodiment of the present application, the position of the gaze point 305 on the first lens layer 3a is measured by the gaze angle measurement sensor. Because the gaze point 305 is located in the first optical zone, the second optical zone is located at the periphery of the first optical zone. In this way, the positions of the first optical zone and the second optical zone, as well as the numbers of the liquid crystal lens zones included in the first optical zone and the second optical zone can be determined, wherein the optical focal length of the liquid crystal region 3021 located in the first optical zone can correspond to the degree of myopia. In addition, the optical focal length of the liquid crystal region 3021 located in the second optical zone is superimposed with the defocus degree on the basis of the corresponding degree of myopia, and the second optical zone is used as a defocus area.

[0166] It is understandable that in the present application, the position of the first optical zone can change with the change of the position of the gaze point 305, and the position of the defocused area will also change adaptively with the change of the position of the gaze point 305, so that the visual axis of the human eye passes through the first optical zone as much as possible, so as to better ensure sufficiently clear far vision and peripheral defocusing effect. In addition, since the human eye has the ability to adapt to the pupil distance, and the pupil distances of different individuals are different, the lens 3 provided by the present application can be used to dynamically adjust the position of the defocused area of ​​the first lens layer 3a of the lens 3 to achieve the movement and adjustment of the central area of ​​the entire lens 3, thereby meeting the personalized needs of different positions of the optical central area of ​​the lens 3 caused by the diverse pupil distances of users.

[0167] Because traditional myopia prevention glasses are designed based on the human eye looking straight ahead and the line of sight passing through the optical center of the lens. Figure 8a As shown, Figure 8a The position where the line of sight of the human eye passes through the lens when the human eye looks straight ahead. In real life, when the human eye looks in all directions, the eyeball will keep moving, so the line of sight of the human eye may not always pass through the optical center of the lens 3. Figure 8b As shown, Figure 8b The position where the line of sight of the human eye passes through the lens when reading at a close distance is shown. At this time, binocular single vision is formed, the two eyes produce convergence and downward rotation movement, and the gaze line of the human eye will look out to one side of the lens. Therefore, when the human eye looks at objects at different distances, the position where the gaze line of the human eye passes through the lens is different, that is, the position of the gaze point 305 on the lens 3 is different.

[0168] Based on this, in a possible embodiment of the present application, the position of the gaze point 305 on the first lens layer 3a can also be determined by the viewing distance of the human eye. In the specific implementation, the first step is to obtain the viewing distance of the human eye through intelligent perception. Among them, the viewing distance of the human eye can be obtained by wireless telemetry, which can be but not limited to various distance measuring sensors based on technologies such as infrared and ultrasonic waves. The distance measuring sensor 11 can be set at a corner of the glasses. In addition, since the space between the frame 2 and the temple 4 of the glasses is relatively large, in some embodiments of the present application, reference can be made to Fig. 9 , Fig. 9 A partial structural diagram of glasses of a possible embodiment of the present application is shown. In this embodiment, the distance sensor 11 can also be arranged at the connection between the frame 2 and the temple 4, and it can also match the pattern on the frame 2 or the temple 4 to have good concealment and aesthetics.

[0169] In the second step, a sight mark (such as a vision chart) is placed on a table, and a person sits and reads in a prone position, and the positions of the sight lines of several people passing through the first optical zone of the first lens layer 3a at different reading distances are measured. The positions of the gaze points 305 corresponding to the viewing distances of the human eyes of 20 cm, 33 cm and 50 cm on the left lens and the right lens are mapped to form a mapping relationship such as shown in Table 4, and the mapping relationship is pre-stored in the memory of the glasses.

[0170] Table 4

[0171]

[0172]

[0173] In the present application, the center point of the lens can be set as the coordinate origin of the lens. In addition, the direction of the line connecting the two connection points of the two side temples and the corresponding side lenses can be used as the x-axis, and the direction perpendicular to the line connecting the above two connection points can be used as the y-axis.

[0174] In the third step, based on the human eye viewing distance obtained in the first step and the discrete data relationship in the above table read by the processor, the processor can calculate the position of the gaze point 305 on the corresponding lens at the human eye viewing distance, thereby obtaining the position of the gaze point 305 on the first lens layer.

[0175] Among them, when the viewing distance is less than 20cm, it is ultra-close reading, and the 20cm data is directly taken as the lens position through which the line of sight passes.

[0176] When the viewing distance is between 20 and 33 cm, the approximate center position of the line of sight is deduced by a linear relationship, and the first optical zone is roughly adjusted. Assuming that the viewing distance is m centimeters, the position of the gaze point 305 on the left lens can be:

[0177] Lx=Lx1+(Lx2-Lx1)*(m-20) / (33-20);

[0178] Ly=Ly1+(Ly2-Ly1)*(m-20) / (33-20);

[0179] Similarly, the position of the gaze point 305 on the right lens may be:

[0180] Rx=Rx1+(Rx2-Rx1)*(m-20) / (33-20);

[0181] Ry=Ry1+(Ry2-Ry1)*(m-20) / (33-20);

[0182] When the viewing distance is between 33 and 50 cm, the position of the gaze point 305 on the two lenses can be calculated using a similar method as described above, which will not be described in detail here.

[0183] In addition, when the viewing distance is greater than 50 cm, it is considered to be close to the far-sighted state. At this time, the position of the gaze point 305 on the lens can be determined according to the design method of traditional myopia prevention and control glasses during fitting.

[0184] It can be seen from the above segmented calculation process of the viewing distance that the more segments the viewing distance is divided into, the smaller the error of the position of the gaze point 305 on the lens 3 estimated at the specific viewing distance.

[0185] In this embodiment of the present application, through the mapping relationship between the viewing distance and the position of the gaze point 305 on the lens 3, the position of the gaze point 305 on the lens 3 can be obtained by measuring the viewing distance, thereby obtaining the position of the gaze point 305 on the first lens layer 3a. Because the gaze point 305 is located in the first optical zone, the second optical zone is located at the periphery of the first optical zone. In this way, the positions of the first optical and second optical zones, as well as the numbers of the liquid crystal lens zones included in the first optical and second optical zones can be determined, wherein the optical focal length of the liquid crystal region 3021 located in the first optical zone can correspond to the degree of myopia. In addition, the optical focal length of the liquid crystal region 3021 located in the second optical zone is superimposed with the defocus degree on the basis of the corresponding degree of myopia, and the second optical zone serves as a defocus zone.

[0186] It is understandable that in the present application, the position of the first optical zone can change with the change of the position of the gaze point 305, and the position of the defocused area will also change adaptively with the change of the position of the gaze point 305, so that the visual axis of the human eye passes through the first optical zone as much as possible, so as to better ensure sufficiently clear far vision and peripheral defocusing effect. In addition, since the human eye has the ability to adapt to the pupil distance, and the pupil distances of different individuals are different, the lens 3 provided by the present application can be used to dynamically adjust the position of the defocused area of ​​the first lens layer 3a of the lens 3 to achieve the movement and adjustment of the central area of ​​the entire lens 3, thereby meeting the personalized needs of different positions of the optical central area of ​​the lens 3 caused by the diverse pupil distances of users.

[0187] In the present application, the first lens layer 3a provided in the above embodiment can also form the lens 3 of the glasses together with the traditional solid concave lens. In the present application, for the convenience of description, the solid lens can be referred to as the second lens layer 10, and the second lens layer 10 can be stacked with the first lens layer 3a. In this way, in the lens 3, the first lens layer 3a can provide the position movement of the first optical zone and the second optical zone, as well as the adjustment of the defocus degree, and the second lens layer 10 is used to provide the basic optical focal length corresponding to the user's myopia degree to achieve the effect of vision correction. In addition, it can be understood that in some embodiments of the present application, the peripheral defocus effect of the lens can also be achieved by the optical focal length of the second optical zone and the optical focal length of the second lens layer superimposed on each other.

[0188] For specific implementation, please refer to Fig.10 , Fig.10The schematic diagram of the structure of the lens provided by an embodiment of the present application is shown. In this embodiment, the second lens layer 10 is a single concave geometric optical lens, which includes a first surface 1001 and a second surface 1002 arranged opposite to each other, the first surface 1001 is a concave surface, the second surface 1002 is a plane, and the second surface 1002 can be attached and connected to the first substrate 301a of the first lens layer 3a. The first lens layer 3a includes a plurality of liquid crystal regions 3021 arranged in an array, and each liquid crystal region 3021 has a liquid crystal layer 3021 formed by applying a liquid crystal layer 3021 to the first lens layer 3a. Figure 5 The electric field distribution formed by the voltage difference between the first sub-electrode 3031a and the surrounding second sub-electrode 3031b as a common power supply electrode is shown. When the voltages applied to the first sub-electrode 3031a and the second sub-electrode 3031b are the same, the liquid crystal molecules in each liquid crystal region 3021 will not be deflected, so that no optical focal length is generated, and the first lens layer is a flat mirror without optical focal length. In addition, when the voltages applied to the first sub-electrode 3031a and the second sub-electrode 3031b are different, a voltage difference is generated between the first sub-electrode 3031a and the second sub-electrode 3031b, and an electric field distribution can be formed in the liquid crystal region 3021, and the liquid crystal molecules are deflected to form optical focal length, thereby generating a lens effect.

[0189] In the Fig.10 When the lens 3 shown is used for zoom glasses, the optical power of the first optical zone, the optical power of the second optical zone, and the positions of the first optical zone and the second optical zone can be flexibly adjusted. In specific implementation, the first step is to establish a wireless connection path with the glasses through the application software of an external terminal device such as a mobile phone, and set the user's diopter and defocus degree for the zoom glasses. When the glasses receive the setting command of the diopter and defocus degree transmitted from an external terminal device such as a mobile phone, the processor converts the diopter and defocus degree into the corresponding optical power. The relationship between the optical power and the diopter or defocus degree of ordinary optometry is: optical power = (diopter or defocus degree) / 100.

[0190] In another possible embodiment of the present application, an intelligent sensing module can be provided on the glasses to obtain the displacement between the imaging of each point of the retina 1 and the ideal imaging through the intelligent sensing module, and convert it into the degree of myopia and the degree of defocus, so as to realize the self-setting of the glasses. In addition, the intelligent sensing module can use any possible ray tracing sensor, including but not limited to Shack-Hartmann wavefront sensor and Tscherning sensor, etc.

[0191] The second step is to determine the number of the liquid crystal region 3021 located in the first optical zone by measuring the sensor. In this embodiment of the present application, the myopia degree is realized by the second lens layer 10, and the portion of the first lens layer 3a located in the first optical zone can be set as a flat lens, and the liquid crystal region 3021 included in the first optical zone has no optical power. The optical power of the liquid crystal region 3021 located in the second optical zone of the first lens layer 3a is superimposed with the defocus degree on the basis of the corresponding myopia degree, and the optical power of the liquid crystal region 3021 located in the second optical zone is the defocus degree.

[0192] Taking the setting of myopia degree of -300 degrees and defocus degree of 200 degrees as an example, the second lens layer 10 can be polished to the user's myopia degree of -300 degrees when fitting the glasses; the optical focal length of the liquid crystal area 3021 located in the first optical zone of the first lens layer 3a is 0, while the optical focal length of the liquid crystal area 3021 located in the second optical zone is 200 degrees, thereby forming a defocus effect in which the optical focal length of the first optical zone and the second optical zone differs by 2D (or 200 degrees).

[0193] It can be understood that in this embodiment of the present application, the defocus degree of the liquid crystal area 3021 located in the second optical zone of the first lens layer 3a can also be set to change gradually from the central area to the peripheral area. For example, the optical focal length of each liquid crystal area 3021 located in the second optical zone is linearly progressively related to the distance from the gaze point 305, thereby reducing the image jump interference caused by the large difference in refractive power of adjacent parts of the second optical zone of the entire lens 3, so as to improve the comfort of user use.

[0194] In the third step, the processor retrieves the corresponding control voltage amplitude and voltage frequency from the memory according to the optical focal length of each liquid crystal area 3021, and transmits them to the voltage conversion unit corresponding to each liquid crystal area 3021, so that the voltage conversion unit outputs a voltage signal of the corresponding frequency, so that the liquid crystal areas 3021 located in the central area and the peripheral area form the preset optical focal length.

[0195] The position of the first optical zone of the lens 3 provided in this embodiment of the present application can change with the change of the position of the gaze point, and the position of the second optical zone will also change adaptively with the change of the position of the gaze point, so that the visual axis of the human eye passes through the first optical zone as much as possible, so as to better ensure sufficiently clear far vision and peripheral defocus effect. In addition, since the human eye has the ability to adapt to the pupil distance, and the pupil distance of different individuals is different, the lens 3 provided by the present application can be used to grind the second lens layer 10 in a customized manner, and the central area of ​​the second lens layer 10 is located directly in front of the user's eyeball by adjusting the assembly position. The dynamic adjustment of the defocus area position of the first lens layer 3a can realize the movement and adjustment of the first optical zone of the entire lens 3, thereby meeting the personalized needs of different positions of the first optical zone of the lens 3 caused by the diverse pupil distances of users.

[0196] It is worth mentioning that the focal power of the liquid crystal region 3021 located in the first optical zone and the defocus degree of the liquid crystal region 3021 located in the second optical zone of the first lens layer 3a of the lens provided by the present application can be adjusted by the voltage amplitude and voltage frequency applied to the corresponding sub-electrode pair 3031. Therefore, when the first lens layer 3a provided by the present application is used for Fig.10 When the lens 3 is shown, the optical focal length of the liquid crystal region 3021 of the first lens layer 3a of the lens 3 located in the second optical zone can be adjusted according to the defocus tolerance and eye defocus conditions of different people, so as to meet the personalized defocus needs of the user, and also meet the user's demand for new defocus degree after the axial length of the eye grows.

[0197] In addition to being compounded with a traditional solid concave lens to form a lens 3, the lens provided in the above embodiment of the present application can also be compounded with another liquid crystal lens to form a lens 3. In the present application, the lens 3 may also include a second lens layer 10, which is a liquid crystal lens layer. In the lens 3 provided in this embodiment of the present application, the first lens layer 3a can provide the position movement of the first optical zone and the second optical zone, as well as the adjustment function of the defocus degree. The second lens layer 10 is used to provide a basic optical focal length corresponding to the user's myopia degree, so as to achieve the purpose of myopia correction. Since the liquid crystal lens has the advantage of adjustable diopter zoom, it can be applied to users with faster myopia development, such as teenagers. It can also be applied to multi-user scenarios such as AR or VR glasses to flexibly adjust and adapt to users with different myopia degrees in order to flexibly adjust and adapt to the needs of users with increasing myopia degrees.

[0198] Reference Fig.11 , Fig.11 The schematic diagram of the structure of the lens 3 provided by another embodiment of the present application is shown. In this embodiment, the second lens layer 10 includes a third substrate 1003, a fourth substrate 1004, and a liquid crystal layer 1005 located between the third substrate 1003 and the fourth substrate 1004. The liquid crystal molecules in the liquid crystal layer 1005 can be deflected with the applied voltage so that the second lens layer 10 forms a uniform optical focal length. Generally, the optical focal length that can be formed by the liquid crystal lens layer is Limited by the material properties of the liquid crystal molecules (birefringence Δn), the thickness of the liquid crystal layer d and the lens aperture radius r, we have:

[0199]

[0200] The birefringence of commonly used liquid crystal materials is Δn≤0.3, the thickness is d≤30μm, and the lens aperture radius is 15mm, then:

[0201]

[0202] It can be seen from the above formula that the aperture of the liquid crystal lens layer becomes twice as large as before, and the optical focal length rapidly decreases to one-fourth of the original. When the radius of the aperture of the traditional lens is 15 mm, its maximum optical focal length is only 0.08D, which is equivalent to 8 degrees of diopter, which is far from the range of myopia diopter of the human eye.

[0203] Based on this, the second lens layer 10 of the present application can be set with a Fresnel type distribution. Among them, the working principle of the Fresnel type lens is based on the fact that the refractive energy of a lens only occurs on the optical surface (such as the lens surface). In this way, as much optical material as possible can be removed from the surface of the lens, and only the curvature of the surface is retained, which looks like a portion of the originally continuous surface of the lens "collapsed" into a plane. In this way, the thickness of the lens can be thinner at the same optical power, or a larger optical power can be formed at the same thickness. In order to facilitate the understanding of the structure of the liquid crystal lens using the Fresnel type distribution, first refer to Fig.12a , Fig.12a The structure of a conventional solid concave lens provided by a possible embodiment of the present application is shown. Figure 12b , Figure 12b Shows the change in optical power in different areas. Figure 12b , surfaces represented by the same line type have the same curvature.

[0204] In addition, refer to Fig.12c ,exist Fig.12c In the second lens layer 10 shown, the redundant material on the surface of the second lens layer 10 is removed, and only the multiple nested annular regions (also called Fresnel lobes) divided from the central region to the peripheral region of the second lens layer 10 are retained, and an annular groove is formed between two adjacent annular regions, and the surface of each annular region retains the original curvature. At this time, the second lens layer 10 looks like its original continuous surface "collapses" into the same plane at each division to form a series of sawtooth annular grooves.

[0205] Reference Fig.13 , Fig.13 Shown Fig.12c The cross-sectional view of the potential distribution of the second lens layer 10 is shown in FIG. In this embodiment of the present application, annular sub-electrodes can be formed at the inner and outer circles of each annular region, respectively. In this embodiment, the annular sub-electrodes can be understood as being distributed in a Fresnel-type spacing. Fig.12cIn this embodiment, a corresponding voltage can be applied to the annular sub-electrodes arranged in sequence from the central area to the peripheral area of ​​the second lens layer 10. In the direction from the central area to the peripheral area, a Fresnel lobe-shaped refractive index distribution can be formed between the center of the second lens layer 10 and the first annular sub-electrode, and the second lens layer 10 as a whole forms a liquid crystal lens with a relatively large aperture.

[0206] Taking the needs of people with low to moderate myopia as an example, the second lens layer 10 needs to support a zoom range of 0 to -600 degrees, which is equivalent to a focal power of 0 to -6D:

[0207]

[0208] The maximum optical focal length is It is -6D (myopia 600 degrees), the birefringence Δn of the commonly used liquid crystal material is 0.3, and the thickness d is 30μm, so the aperture radius R1 of the central area is 1.73mm. The actual central area aperture can produce both positive and negative optical focal lengths, which are -6D to 6D.

[0209] A design that simplifies the difficulty is to only require the second lens layer 10 to be It is ±3D, and the zoom range is -3D to +3D. Fig.14 , Fig.14 This is a schematic diagram of the structure of the second lens layer shown in another embodiment of the present application. In this embodiment, the third substrate 1003 of the second lens layer 10 can be processed to have a fixed -3D optical focal length, so that the zoom range of the second lens layer 10 is changed from -3D to +3D translation to 0 to -6D, and the aperture radius R1 of the central area is obtained to be 2.45 mm.

[0210] In this embodiment of the present application, to ensure that the optical power of each Fresnel lobe is the same, it is necessary to ensure that the optical path difference (OPD) generated by each Fresnel lobe is the same:

[0211]

[0212] R1 is the radius of the first Fresnel lobe from the central area to the peripheral area, n is the nth Fresnel lobe, Rn is the radius of the nth Fresnel lobe, and f is the focal length of the Fresnel lobe. The above formula can be simplified to:

[0213]

[0214] By the above Fig.13As shown in the cross-sectional view of the potential distribution, an annular electrode is arranged in each Fresnel lobe, and the same voltage difference ΔV is applied in each annular area, so that all Fresnel lobes form the same optical focal length and are combined into a complete Fresnel lens. In the present application, a mapping relationship between the voltage difference ΔV and the optical focal length can be established and stored in the memory in advance.

[0215] When the lens 3 formed by the first lens layer 3a and the second lens layer 10 mentioned above in the present application is used for zoom glasses, the positions of the first optical zone and the second optical zone, as well as the optical focal length of the first optical zone and the second optical zone can be flexibly adjusted. In specific implementation, the first step is to establish a wireless connection path with the glasses through the application software of an external terminal device such as a mobile phone, and set the user's diopter and defocus degree for the zoom glasses. When the glasses receive the setting command of the diopter and defocus degree transmitted from an external terminal device such as a mobile phone, the processor converts the diopter and defocus degree into the corresponding optical focal length. The relationship between the optical focal length and the diopter or defocus degree of ordinary optometry is: optical focal length = (diopter or defocus degree) / 100.

[0216] In another possible embodiment of the present application, an intelligent sensing module can be provided on the glasses to obtain the displacement between the imaging of each point of the retina 1 and the ideal imaging through the intelligent sensing module, and convert it into the degree of myopia and the degree of defocus, so as to realize the self-setting of the glasses. In addition, the intelligent sensing module can use any possible ray tracing sensor, including but not limited to Shack-Hartmann wavefront sensor and Tscherning sensor, etc.

[0217] In the second step, the number of the liquid crystal region 3021 located in the first optical zone is determined by the measuring sensor. In this embodiment of the present application, the myopia degree is realized by the second lens layer 10, and the portion of the first lens layer 3a located in the first optical zone can be set as a flat lens, and the liquid crystal region 3021 included in the first optical zone has no optical power. The optical power of the liquid crystal region 3021 located in the second optical zone of the first lens layer 3a is superimposed with the defocus degree on the basis of the corresponding myopia degree, and the optical power of the liquid crystal region 3021 located in the second optical zone is the defocus degree.

[0218] Referring to Table 5, Table 5 gives an example of the corresponding relationship between the refractive power and the defocus power of an embodiment of the present application. Taking the setting of myopia degree -300 degrees and defocus degree 200 degrees as an example, the optical focal length of the second lens layer 10 is the user's myopia degree -300 degrees (i.e. -3D). The optical focal length of the liquid crystal region 3021 of the first lens layer 3a located in the first optical zone is 0, which can be combined with the second lens layer 10 to form a human eye myopia degree of -300 degrees. The optical focal length of the liquid crystal region 3021 of the first lens layer 3a located in the second optical zone is 200 degrees, which can be combined with the second lens layer 10 to form a -100 degree lens effect. Then the optical focal lengths of the first optical zone and the second optical zone of the entire lens 3 constitute a defocus effect that differs by 200 degrees (or 2D).

[0219] Table 5

[0220]

[0221] It can be understood that in this embodiment of the present application, the defocus degree of the liquid crystal area 3021 located in the second optical zone of the first lens layer 3a can also be set to change gradually from the central area to the peripheral area. For example, the optical focal length of each liquid crystal area 3021 located in the second optical zone is linearly progressively related to the distance from the gaze point 305, thereby reducing the image jump interference caused by the large difference in refractive power of adjacent parts of the peripheral area of ​​the entire lens 3, so as to improve the comfort of user use.

[0222] In the third step, the processor retrieves the corresponding control voltage amplitude and voltage frequency from the memory according to the optical focal length of each liquid crystal area 3021 of the first lens layer 3a and the optical focal length of the second lens layer 10, and transmits them to the corresponding voltage conversion units of the first lens layer 3a and the second lens layer 10 respectively, so that the corresponding voltage conversion units output voltage signals of corresponding frequencies, so that the central area and the peripheral area of ​​the entire lens 3 form the preset optical focal length.

[0223] The position of the first optical zone of the lens 3 provided in this embodiment of the present application can change with the position of the gaze point, and the position of the second optical zone will also change adaptively with the change of the position of the gaze point, so that the visual axis of the human eye passes through the first optical zone as much as possible, so as to better ensure sufficiently clear far vision and peripheral defocus effect. In addition, since the human eye has the ability to adapt to the pupil distance, and the pupil distance of different individuals is different, the lens 3 provided by the present application can be used to design the second lens layer 10 in a customized manner, and the central area of ​​the second lens layer 10 is located directly in front of the user's eyeball by adjusting the assembly position. The dynamic adjustment of the position of the second optical zone of the first lens layer 3a can realize the movement and adjustment of the first optical zone of the entire lens 3, thereby meeting the personalized needs of different positions of the first optical zone of the lens 3 caused by the diverse pupil distances of users.

[0224] It is worth mentioning that, since the second lens layer 10 of the lens 3 provided in this embodiment of the present application is a liquid crystal lens, the overall refractive power of the lens 3 can be adjusted by adjusting the optical power of the second lens layer 10, so that the lens 3 can be adapted to the wearing requirements of the user again to avoid frequent glasses. In addition, the optical power of the liquid crystal region 3021 located in the peripheral area of ​​the first lens layer 3a can also be adjusted according to the defocus tolerance and eye defocus conditions of different people, so as to meet the personalized defocus needs of the user, and also meet the user's demand for a new defocus degree after the eye axis grows.

[0225] In another possible embodiment of the present application, the above Figure 5 The first lens layer 3a shown can also be combined with a liquid lens to form a lens 3. In this embodiment of the present application, the first lens layer 3a can be stacked with the second lens layer 10. In addition, the first lens layer 3a can provide the position movement of the first optical zone and the second optical zone, and the adjustment of the defocus degree of the second optical zone. The second lens layer 10 is used to provide a basic optical focal length corresponding to the myopia degree of the user to achieve vision correction.

[0226] For specific implementation, please refer to Fig.15 , Fig.15 A schematic diagram of the structure of a lens 3 provided in another embodiment of the present application. In this embodiment, the second lens layer 10 may include a third substrate 1003 and a fourth substrate 1004, wherein the third substrate 1003 is an elastic film substrate, and the fourth substrate 1004 is a hard substrate. The third substrate 1003 may be made of, but not limited to, an elastic material such as polydimethylsiloxane (PDMS). The fourth substrate 1004 may be made of, but not limited to, a transparent material such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), polydimethylsiloxane (PDMS), etc. The third substrate 1003 and the fourth substrate 1004 are interlocked to form a liquid storage chamber therebetween. In this embodiment of the present application, the liquid storage chamber may be filled with an optical liquid 1006.

[0227] In some possible embodiments, in order to ensure the volume of the liquid storage chamber, a baffle 1007 may be provided between the third substrate 1003 and the fourth substrate 1004. The baffle 1007 may be provided along the edge of the third substrate 1003 and the fourth substrate 1004, and the baffle 1007 is connected to the third substrate 1003 and the fourth substrate 1004, and the connection method may be but not limited to bonding, so as to form a sealed liquid storage chamber between the third substrate 1003, the fourth substrate 1004 and the baffle 1007. In addition, in the present application, a liquid inlet and outlet channel may be provided on the baffle 1007, through which the optical liquid 1006 may be filled into the liquid storage chamber, or the optical liquid 1006 in the liquid storage chamber may flow out.

[0228] In the present application, since the third substrate 1003 is an elastic film substrate, as the volume of the optical liquid 1006 in the liquid storage chamber decreases, the supporting force exerted by the optical liquid 1006 on the third substrate 1003 decreases, so that the third substrate 1003 is recessed toward the fourth substrate 1004. At this time, the second lens layer 10 presents a concave lens structure. In addition, as the volume of the optical liquid 1006 in the liquid storage chamber increases, the supporting force exerted by the optical liquid 1006 on the third substrate 1003 increases, so that the third substrate 1003 can be deformed in a direction away from the fourth substrate 1004. When the volume of the optical liquid 1006 is large enough, the third substrate 1003 will also bulge in a direction away from the fourth substrate 1004, so that the second lens presents a convex lens structure. Therefore, as the volume of the optical liquid 1006 in the liquid storage chamber changes, the optical focal length of the second lens layer 10 changes.

[0229] From the above introduction to the second lens layer 10, it can be known that in this embodiment of the present application, the liquid storage chamber of the second lens layer 10 can be filled with optical liquid 1006, and the optical power of the liquid storage chamber changes with the change in the volume of the optical liquid 1006 in the liquid storage chamber. Therefore, in the present application, the liquid storage chamber can also be regarded as a lens. Then the second lens layer 10 provided in this embodiment of the present application can be regarded as a composite structure of two lenses, the second lens layer 10 and the liquid storage chamber. The optical power of the second lens layer 10 is the sum of the optical powers of the lenses used to constitute the second lens layer 10, which can be expressed as:

[0230]

[0231] in, is the optical focal length of the third substrate 1003, When the amount of the optical liquid 1006 in the liquid storage chamber decreases, the elastic film is concave to form a myopic concave lens. At this time, the optical focal length of the entire second lens layer 10 is the optical focal length of the liquid storage chamber superimposed on the optical focal length formed by the concave third substrate 1003.

[0232] In the above Fig.15 When the lens 3 shown is used for zoom glasses, the optical power of the first optical zone, the optical power of the second optical zone, and the positions of the first optical zone and the second optical zone can be flexibly adjusted. In specific implementation, the first step is to establish a wireless connection path with the glasses through the application software of an external terminal device such as a mobile phone, and set the user's diopter and defocus degree for the zoom glasses. When the glasses receive the setting command of the diopter and defocus degree transmitted from an external terminal device such as a mobile phone, the processor converts the diopter and defocus degree into the corresponding optical power. The relationship between the optical power and the diopter or defocus degree of ordinary optometry is: optical power = (diopter or defocus degree) / 100.

[0233] In another possible embodiment of the present application, an intelligent sensing module can be provided on the glasses to obtain the displacement between the imaging of each point of the retina 1 and the ideal imaging through the intelligent sensing module, and convert it into the degree of myopia and the degree of defocus, so as to realize the self-setting of the glasses. In addition, the intelligent sensing module can use any possible ray tracing sensor, including but not limited to Shack-Hartmann wavefront sensor and Tscherning sensor, etc.

[0234] The second step is to determine the number of the liquid crystal region 3021 located in the first optical zone by measuring the sensor. In this embodiment of the present application, the myopia degree is realized by the second lens layer 10, and the portion of the first lens layer 3a located in the first optical zone can be set as a flat lens, and the liquid crystal region 3021 included in the first optical zone has no optical power. The optical power of the liquid crystal region 3021 located in the second optical zone of the first lens layer 3a is superimposed with the defocus degree on the basis of the corresponding myopia degree, and the optical power of the liquid crystal region 3021 located in the second optical zone is the defocus degree.

[0235] Taking the setting of myopia degree of -300 degrees and defocus degree of 200 degrees as an example, the second lens layer 10 can adjust the volume of its optical liquid 1006 so that its optical focal length is the user's myopia degree of -300 degrees; the optical focal length of the liquid crystal area 3021 located in the first optical zone of the first lens layer 3a is 0, while the optical focal length of the liquid crystal area 3021 located in the second optical zone is 200 degrees, thereby forming a defocus effect in which the optical focal length of the first optical zone and the second optical zone differs by 2D (or 200 degrees).

[0236] It can be understood that in this embodiment of the present application, the defocus degree of the liquid crystal area 3021 located in the second optical zone of the first lens layer 3a can also be set to change gradually from the central area to the peripheral area. For example, the optical focal length of each liquid crystal area 3021 located in the second optical zone is linearly progressively related to the distance from the gaze point 305, thereby reducing the image jump interference caused by the large difference in refractive power of adjacent parts of the second optical zone of the entire lens 3, so as to improve the comfort of user use.

[0237] In the third step, the processor retrieves the corresponding control voltage amplitude and voltage frequency from the memory according to the optical focal length of each liquid crystal area 3021, and transmits them to the voltage conversion unit corresponding to each liquid crystal area 3021, so that the voltage conversion unit outputs a voltage signal of the corresponding frequency, so that the liquid crystal areas 3021 located in the central area and the peripheral area form the preset optical focal length.

[0238] The position of the first optical zone of the lens 3 provided in this embodiment of the present application can change with the change of the position of the gaze point, and the position of the second optical zone will also change adaptively with the change of the position of the gaze point, so that the visual axis of the human eye passes through the first optical zone as much as possible, so as to better ensure sufficiently clear far vision and peripheral defocus effects.

[0239] In addition, since the human eye has the ability to adapt to the pupil distance, and the pupil distances of different individuals are different, the lens 3 provided by the present application can be used to set the second lens layer 10 in a customized manner, and the central area of ​​the second lens layer 10 can be located directly in front of the user's eyeball by adjusting the assembly position. The position of the second optical zone of the first lens layer 3a can be dynamically adjusted to achieve the movement and adjustment of the first optical zone of the entire lens 3, thereby meeting the personalized needs of different positions of the first optical zone of the lens 3 caused by the diverse pupil distances of users.

[0240] It is worth mentioning that, since the second lens layer 10 of the lens 3 provided by the present application is a liquid lens, the optical power of the second lens layer 10 can be adjusted by adjusting the volume of the optical liquid 1006 in the liquid storage chamber, thereby adjusting the diopter of the entire lens 3, so that the lens 3 can be re-adapted to the wearing requirements of the user and avoid frequent glasses. In addition, the optical power of the liquid crystal area 3021 of the first lens layer 3a located in the second optical zone can be adjusted according to the defocus tolerance and eye defocus conditions of different people, so as to meet the personalized defocus needs of the user, and also meet the user's demand for new defocus degrees after the eye axis grows.

[0241] In addition to the configuration methods provided in the above embodiments, the second lens layer 10 provided in the present application can also be configured in other possible structural forms, as long as it can cooperate with the first lens layer 3a to achieve the setting of the myopia degree of the lens 3 to achieve the purpose of myopia correction. Fig.16 The second lens layer 10 may further include two solid lenses 1008, each of which has a curved surface 10081, and at least a portion of the curved surfaces 10081 of the two solid lenses 1008 is disposed opposite to each other. In this way, the overlapped portion of the two solid lenses 1008 (e.g. Fig.16 The portion between the two dotted lines in FIG. 1 ) together form the optical power of the second lens layer 10 .

[0242] In addition, because at least parts of the curved surfaces 10081 of the two solid-state lenses 1008 are disposed opposite to each other, as the two solid-state lenses 1008 are moved along Fig.16 The offset movement in the direction of the arrow shown in the figure can cause the relatively arranged parts of the curved surfaces 10081 of the two solid-state lenses 1008 to be offset and move, thereby changing the optical focal length of the overlapping part of the two solid-state lenses 1008, so as to change the optical focal length of the second lens layer 10.

[0243] In the Fig.16 When the second lens layer 10 is stacked with the first lens layer 3a, the optical power of the second lens layer 10 can be adjusted by adjusting the relative positions of the two solid lenses 1008 of the second lens layer 10, thereby adjusting the diopter of the entire lens 3, so that the lens 3 can be re-adapted to the wearing requirements of the user to avoid frequent glasses. In addition, the optical power of the liquid crystal area 3021 of the first lens layer 3a located in the second optical zone can be adjusted according to the defocus tolerance and eye defocus conditions of different people, so as to meet the personalized defocus requirements of the user, and also meet the user's demand for new defocus after the eye axis grows.

[0244] It is worth mentioning that in some possible embodiments of the present application, for the second lens layer 10 with adjustable optical power provided in the above embodiments, for example, a liquid lens layer, a liquid crystal lens layer or a Fig.16 The solid-state lens assembly shown can also be provided with a distance sensor on the frame of the glasses, and the distance sensor can be used to measure the distance of human eye viewing, wherein the distance of human eye viewing is the distance between the human eye and the target object that the human eye is gazing at. In this way, the optical power of the second lens layer 10 can be adjusted according to the distance of human eye viewing measured by the distance sensor. In specific implementation, the distance of human eye viewing can be obtained first. Then, the optical power of the second lens layer is determined according to the relationship function between the distance of human eye viewing and a univariate multi-time polynomial.

[0245] In a possible implementation of the present application, a relationship function of a univariate multi-order polynomial can be obtained by fitting multiple sets of discrete data, wherein the discrete data includes the corresponding relationship between the viewing distance of the human eye and the optical focal length.

[0246] By adopting the lens adjustment method provided by the present application, the optical power of the second lens layer of the lens can be changed according to the change of the viewing distance of the human eye according to the univariate multi-time polynomial relationship function between the two. Thus, the second lens layer can adapt to the needs of the change of the human eye adjustment load at different viewing distances, thereby improving the myopia prevention and control effect of the lens.

[0247] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0248] The present application is described with reference to the flowchart and / or block diagram of the method, device (system), and computer program product according to the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the process and / or box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the function specified in one process or multiple processes in the flowchart and / or one box or multiple boxes in the block diagram.

[0249] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0250] These computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0251] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the 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 lens, characterized in that: The lens comprises a first lens layer, wherein the first lens layer comprises a plurality of liquid crystal regions, at least one of the liquid crystal regions forms a first optical zone in the first lens layer, at least one of the liquid crystal regions forms a second optical zone in the first lens layer, the second optical zone is arranged around the first optical zone, and the optical focal power of the first optical zone is different from the optical focal power of the second optical zone; The first optical zone is an area where the human eye's gaze point is located on the first lens layer, and the position of the human eye's gaze point on the first lens layer is obtained according to the human eye's viewing distance and based on a preset mapping relationship, wherein the human eye's viewing distance is the distance between the human eye and the target object that the human eye is gazing at.

2. The lens according to claim 1, wherein: When the viewing distance of the human eye changes, the position of the gaze point on the lens changes, and the positions of the first optical zone and the second optical zone change.

3. The lens according to claim 1 or 2, characterized in that: The first lens layer includes a first substrate, a second substrate, a first electrode and a second electrode, wherein: The first electrode is disposed on the first substrate, the second electrode is disposed on the second substrate, and the second electrode includes a plurality of sub-electrode pairs, each of the sub-electrode pairs includes a first sub-electrode and a second sub-electrode, and the second sub-electrode is a ring-shaped electrode; for each of the sub-electrode pairs, there is a voltage difference between the first sub-electrode and the second sub-electrode; The multiple liquid crystal regions are arranged between the first substrate and the second substrate, and the multiple liquid crystal regions are arranged one-to-one corresponding to the multiple sub-electrode pairs. The second sub-electrode of each sub-electrode pair is arranged corresponding to the edge of the liquid crystal region; each of the liquid crystal regions includes liquid crystal molecules, and the liquid crystal molecules can be deflected according to the voltage difference between the corresponding sub-electrode pairs.

4. The lens according to claim 1 or 2, characterized in that: The optical power of the liquid crystal region in the first optical zone is zero.

5. The lens according to claim 1 or 2, characterized in that: In the direction from the first optical zone to the second optical zone, the optical power in the second optical zone increases gradually.

6. The lens according to claim 5, characterized in that Each of the liquid crystal regions in the second optical zone forms an optical focal length, and the optical focal length of the liquid crystal regions in the second optical zone gradually increases in a direction from the first optical zone to the second optical zone.

7. The lens according to claim 1 or 2, characterized in that: The lens further includes a second lens layer, wherein the first lens layer and the second lens layer are stacked.

8. The lens according to claim 7, wherein: The second lens layer is a solid concave lens layer, and the second lens layer includes a first surface and a second surface that are arranged opposite to each other, the first surface is a concave surface, the second surface is a plane, and the first lens layer is located on a side of the second surface that is away from the first surface.

9. The lens according to claim 7, wherein: The second lens layer includes two solid lenses, each of the solid lenses has a curved surface, and at least parts of the curved surfaces of the two solid lenses are arranged opposite to each other.

10. The lens according to claim 7, wherein: The second lens layer is a liquid lens layer.

11. The lens according to claim 7, wherein: The second lens layer is a liquid crystal lens layer.

12. The lens according to claim 11, wherein: In the direction from the central area to the peripheral area, the second lens layer includes a plurality of nested annular Fresnel lobes, at least one of the annular Fresnel lobes includes a plurality of sub-annular Fresnel lobes inside, and the optical focal powers of the plurality of sub-annular Fresnel lobes are the same.

13. A lens adjustment method, characterized in that: The lens includes a first lens layer, the first lens layer includes a plurality of liquid crystal regions, and the adjustment method includes: Obtaining the position of the gaze point of the human eye on the first lens layer; Determining the positions of a first optical zone and a second optical zone according to the position of the gaze point on the first lens layer, wherein the gaze point is located in the first optical zone and the second optical zone is located at the periphery of the first optical zone; Determining the liquid crystal region included in the first optical region and the liquid crystal region included in the second optical region according to the positions of the first optical region and the second optical region; Controlling the liquid crystal region in the first optical zone to form a first optical focal length, and controlling the liquid crystal region in the second optical zone to form a second optical focal length, wherein the first optical focal length and the second optical focal length are different; The obtaining the position of the gaze point of the human eye on the first lens layer includes: Acquire a human eye viewing distance, where the human eye viewing distance is the distance between a human eye and a target object that the human eye is gazing at; According to the human eye viewing distance and based on a preset mapping relationship, the position of the gaze point on the first lens layer is obtained.

14. The method according to claim 13, characterized in that The controlling the liquid crystal region in the second optical zone to form a second optical power comprises: In the direction from the first optical zone to the second optical zone, a plurality of second optical focal lengths increasing in sequence are controlled to be formed in the second optical zone, and each of the second optical focal lengths is formed by one or more of the liquid crystal regions.

15. The method according to claim 13 or 14, characterized in that The lens is used for glasses, and the glasses further include a light source, and the method of obtaining the position of the gaze point of the human eye on the first lens layer further includes: emitting a light beam toward the human eye by the light source; Acquire the position of the bright spot formed by the light beam on the surface of the eyeball of the human eye; Obtaining the relative position between the pupil center and the bright spot; The position of the gaze point on the first lens layer is determined according to the relative position between the pupil center and the bright spot.

16. The method according to claim 13 or 14, characterized in that The lens further includes a second lens layer, and the second lens layer is stacked with the first lens layer. The method further includes: Acquire a human eye viewing distance, where the human eye viewing distance is the distance between a human eye and a target object that the human eye is gazing at; The optical power of the second lens layer is determined according to the relationship function between the human eye viewing distance and a univariate multi-order polynomial.

17. A control device, characterized in that: It comprises a processor and a memory; the memory stores program code, and when the program code is executed by the processor, it implements the method according to any one of claims 13 to 16.

18. A pair of glasses, characterized in that: The lens comprises the lens as claimed in any one of claims 1 to 12.

19. The glasses according to claim 18, characterized in that The glasses further comprise a control device as claimed in claim 17.

20. The glasses according to claim 18 or 19, characterized in that: The glasses also include a frame and temples, and the lenses are connected to the frame and the temples.

21. The glasses according to claim 20, characterized in that The glasses also include a light source and a gaze angle measurement sensor, wherein the light source is used to emit a light beam to the human eye, and the gaze angle measurement sensor is used to obtain the position of a bright spot formed by the light beam on the surface of the human eye, and the position of the bright spot is used to determine the position of the gaze point of the human eye on the lens.

22. The glasses according to claim 21, characterized in that The light source and the gaze angle measurement sensor are arranged on the lens frame.

23. The glasses according to claim 18 or 19, characterized in that: The glasses further include a distance measuring sensor, which is used to measure the viewing distance of the human eye.

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