Lens adjustment method and glasses

Abstract

The present application provides a lens adjustment method and glasses. The lens may include a first lens layer, and the first lens layer may include an adjustable area. The lens adjustment method may include first obtaining 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. Afterwards, the optical power of the adjustable area is determined based on the relationship function between the distance of human eye viewing and a univariate multi-time polynomial. Thus, the adjustable area of ​​the first lens layer can adapt to the needs of changes in the human eye adjustment load at different distances of human eye viewing, thereby improving the myopia prevention and control effect of the lens.

Description

Technical Field

[0001] The present application relates to the technical field of optical equipment, and in particular to a lens adjustment method and glasses. 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 effectively prevent and control myopia, a method of adding light for near vision based on optical technology has been proposed. The current lens with added light for near vision has a lower light zone that adds a certain positive optical power on the basis of the myopia degree, so that you can see far through the upper light zone of the lens and see near through the lower light zone. The lower light zone can allow both eyes to transform from a state of concentrated near vision to a relatively relaxed state of far vision, so as to alleviate and eliminate near vision fatigue caused by near vision, thereby effectively achieving the purpose of preventing and controlling the occurrence and development of myopia. However, the light addition degree of the lower light zone of the current lens with added light for near vision is fixed, which cannot adapt to the needs of changes in the adjustment load of the human eye at different viewing distances, thereby affecting the myopia prevention and control effect. Based on this, providing a lens that can flexibly adjust the optical power of areas such as the lower light zone according to the viewing distance of the human eye has become a difficult problem that needs to be solved urgently in this field. Summary of the invention

[0005] The purpose of the present application is to provide a lens adjustment method and glasses, so that the optical focal length of the adjustable area of ​​the lens can be flexibly adjusted according to the viewing distance of the human eye, so as to achieve an effective myopia prevention and control effect.

[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 an adjustable area. The adjustable area can be a local area of ​​the visible area of ​​the first lens layer, such as the lower light area; the adjustable area can also be the entire visible area of ​​the first lens layer. In addition, the optical power of the adjustable area and the viewing distance of the human eye are in a univariate multi-time polynomial relationship function. Therefore, the optical power of the adjustable area of ​​the first lens layer 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. Therefore, the adjustable area of ​​the first lens layer can adapt to the needs of changes in the human eye's adjustment load at different viewing distances, so as to improve the myopia prevention and control effect of the lens.

[0007] It is worth mentioning that the focal length of the human eye is affected by the depth of vision of the eye and the blur tolerance of the visual system, which usually follows the human eye accommodation stimulus-accommodation response curve. Since the human eye accommodation stimulus is the inverse of the distance at which the human eye sees objects, the human eye accommodation stimulus is different at different human eye viewing distances, and the corresponding accommodation hysteresis is also different, so that the focal length added to the adjustable area is different. Therefore, in a possible implementation of the present application, the focal length of the adjustable area can be made to have a univariate multi-time polynomial relationship with the human eye accommodation stimulus, so as to facilitate the determination of the focal length of the adjustable area.

[0008] In the present application, when the first lens layer is specifically arranged, the first lens layer may include two solid lenses, both of which have curved surfaces, and at least parts of the curved surfaces of the two solid lenses are arranged relative to each other. In this way, the optical focal length of the adjustable area can be obtained by superimposing the optical focal lengths of the two solid lenses. Because at least parts of the curved surfaces of the two solid lenses are arranged relative to each other, as the two solid lenses are dislocated, the parts of the curved surfaces of the two solid lenses that are arranged relative to each other can be dislocated, thereby changing the optical focal length of the superimposed parts of the two solid lenses, so that the optical focal length of the adjustable area is changed.

[0009] In another possible implementation of the present application, when the first lens layer is provided, it may include a first substrate, a second substrate and a baffle. The first substrate and the second substrate are arranged opposite to each other, and at least one of the first substrate and the second substrate is an elastic film substrate. In addition, the baffle may be provided between the first substrate and the second substrate, and the baffle may be provided along the edge of the first substrate and the second substrate for a circle, and the baffle is connected to the first substrate and the second substrate to enclose a closed liquid storage chamber between the first substrate, the second substrate and the baffle. The liquid storage chamber is filled with an optical liquid, and a liquid inlet and outlet channel may also be provided on the baffle, and the liquid inlet and outlet channel 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 first substrate and the second 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.

[0010] In addition to the above-mentioned configuration, in a possible implementation of the present application, the first lens layer may include a first substrate, a second substrate, a first electrode, and a second electrode. The first electrode is disposed on the first substrate, the second electrode is disposed on the second substrate, and the second electrode includes a first sub-electrode and a second sub-electrode, and there is a voltage difference between the first sub-electrode and the second sub-electrode. In addition, a first liquid crystal region is also disposed between the first substrate and the second substrate, and the first liquid crystal region includes liquid crystal molecules, which can be deflected with the voltage difference applied between the first sub-electrode and the second sub-electrode, and form a corresponding optical focal length in the adjustable region.

[0011] In addition, in the direction from the central area to the peripheral area, the first lens layer may include a plurality of nested annular Fresnel lobes. In this way, the first sub-electrode and the second sub-electrode may be respectively arranged at the inner circle and the outer circle of the corresponding annular Fresnel lobe, so that a plurality of nested annular voltage difference areas may be formed in the first lens layer, and the liquid crystal molecules of the first 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.

[0012] It can be understood that by changing the voltage difference applied to each annular voltage difference area, the optical focal length formed by the first 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 first lens layer can be designed to be gradually changed in the direction from the central area to the peripheral area.

[0013] 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 first lens layer can be made to have a continuous and gradual effect, thereby effectively reducing the generation of image jump interference of the first lens layer, which can improve the comfort of human eyes.

[0014] As can be seen from the above description, when the voltage difference of the annular Fresnel lobe changes, the voltage applied to the corresponding first liquid crystal region also changes accordingly, and its optical power also changes adaptively. In the present application, the optical power of each annular Fresnel lobe can be linearly related from the central region to the peripheral region to reduce the image jump interference of the first lens layer.

[0015] In the present application, through reasonable design, when the voltage difference applied to the first annular Fresnel lobe changes, the voltage difference applied to each other annular Fresnel lobe can change accordingly, and the change trend is the same. In addition, the difference between the voltage difference of the annular Fresnel lobe farthest from the first annular Fresnel lobe and the voltage difference of the first annular area can be increased. In this way, in the direction from the central area to the peripheral area, the optical focal length of each other annular Fresnel lobe can be adjusted by changing the optical focal length of the first annular Fresnel lobe, and the defocus degree of the first lens layer can be adjusted, which can meet the physiological characteristics of the user that the defocus degree increases accordingly after the myopia degree increases, thereby achieving the purpose of myopia prevention and control.

[0016] In a possible implementation of the present application, the lens may further include a second lens layer, wherein the first lens layer and the second lens layer may be stacked to meet the optical power requirement of the lens by superposition of the optical power of the first lens layer and the second lens layer.

[0017] When the second lens layer is specifically set, the second lens layer can be a liquid crystal lens. In the direction from the central area to the peripheral area, the second lens layer includes a plurality of strip-shaped Fresnel lobes. It can be understood that the second lens layer can form a cylindrical liquid crystal lens, which can be used to correct human eye astigmatism.

[0018] 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 focal powers 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 second lens layer as a whole may form a parabola-like electric field distribution curve, and its imaging quality may be significantly improved.

[0019] In another possible implementation of the present application, the second lens layer is also 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. Among them, the third electrode is arranged on the third substrate, and the fourth electrode is arranged on the fourth substrate. In the present application, the fourth electrode includes a plurality of sub-electrode pairs, each of which includes a third sub-electrode and a fourth sub-electrode. The fourth sub-electrode may be arranged as a ring electrode, and in addition, the third sub-electrodes of each sub-electrode pair are connected so that the voltage applied to the third sub-electrode of each sub-electrode pair is the same, so that by adjusting the voltage applied to the fourth sub-electrode of each sub-electrode pair, a voltage difference can be made between the third sub-electrode and the fourth sub-electrode of each sub-electrode pair. In some other implementations of the present application, the fourth sub-electrodes of each sub-electrode pair may also be connected so that the voltage applied to the fourth sub-electrode of each sub-electrode pair is the same, so that by adjusting the voltage applied to the third sub-electrode of each sub-electrode pair, a voltage difference can be made between the third sub-electrode and the fourth sub-electrode of each sub-electrode pair. Thereby, the structure of the second lens layer can be effectively simplified.

[0020] In addition, in the present application, a plurality of second liquid crystal regions are further arranged between the third substrate and the fourth substrate, and the plurality of second liquid crystal regions are arranged one-to-one corresponding to the plurality of sub-electrode pairs, and the fourth sub-electrode of each sub-electrode pair is arranged corresponding to the edge of the second liquid crystal region. Each second liquid crystal region includes liquid crystal molecules, and there is a voltage difference between the third sub-electrode and the fourth sub-electrode of each sub-electrode pair. In this way, 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 of the corresponding sub-electrode pair, thereby generating corresponding optical focal length.

[0021] Due to the different voltage differences acting on the second liquid crystal region, the deflection angles of the liquid crystal molecules in the second liquid crystal region are different, thereby generating different optical powers. Based on this, in the present application, at least one second liquid crystal region can form a first optical zone on the second lens layer, and at least one second liquid crystal region can form a second optical zone on the second lens layer, and the second optical zone can be arranged around the first optical zone. It can be understood that the optical power generated by the second liquid crystal region used to form the first optical zone is the same, and the optical power generated by the second liquid crystal region used to form the second optical zone is the same, but the optical power of the first optical zone is different from the optical power of the second optical zone. In this way, the optical power formed by the first optical zone can correspond to the myopia degree of the user, and the optical power 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. In addition, in the present application, as the position of the human eye's gaze point on the lens changes, the positions of the first optical zone and the second optical zone can change accordingly, thereby meeting the user's personalized defocus blur tolerance requirements and achieving an effective myopia prevention and control effect.

[0022] Since there are no liquid crystal molecules distributed in the area between two adjacent second liquid crystal areas, the optical focal length of the area between the two second liquid crystal areas is 0. In a possible implementation of the present application, the optical focal length formed in the second liquid crystal area 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.

[0023] 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.

[0024] The optical power of the second optical zone can be gradually increased by adjusting the optical power formed by each second liquid crystal region in the second optical zone. In specific implementation, each second liquid crystal region in the second optical zone can form an optical power, and the optical power formed by each second 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 each second liquid crystal region in the second optical zone can be gradually increased, so that the optical power in the second optical zone can be gradually increased.

[0025] In the second aspect, the present application also provides a method for adjusting a lens, wherein the lens includes a first lens layer, and the first lens layer, when specifically configured, may include 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 first sub-electrode and a second sub-electrode, and there is a voltage difference between the first sub-electrode and the second sub-electrode. A first liquid crystal region is disposed between the first substrate and the second substrate, and the first liquid crystal region includes liquid crystal molecules, which may deflect with the voltage difference between the first sub-electrode and the second sub-electrode, and form a corresponding optical focal length. Then the method for adjusting a lens provided by the present application may include:

[0026] 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;

[0027] The optical power of the adjustable area of ​​the lens is determined according to the relationship function between the human eye's viewing distance and a univariate multi-order polynomial.

[0028] 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.

[0029] By adopting the lens adjustment method provided in the present application, the optical power of the adjustable area of ​​the first 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 adjustable area of ​​the lens 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.

[0030] The optical power of the human eye is affected by the depth of vision of the eye and the blur tolerance of the visual system, and it usually follows the human eye accommodation stimulus-accommodation response curve. Since the human eye accommodation stimulus is the inverse of the distance at which the human eye sees objects, the human eye accommodation stimulus is different at different human eye viewing distances, and the corresponding adjustment hysteresis is also different, so that the optical power added to the adjustable area is different. Therefore, in a possible implementation of the present application, the optical power of the adjustable area of ​​the lens is determined according to the relationship function between the human eye viewing distance and a univariate multi-time polynomial, which may include: determining the optical power of the adjustable area of ​​the lens according to the relationship function between the human eye viewing distance and a univariate multi-time polynomial. In order to facilitate the determination of the optical power of the adjustable area.

[0031] Since the optical focal length in the adjustable region can be formed by the deflection of liquid crystal molecules in the first liquid crystal region located in the adjustable region under the action of the corresponding voltage difference, therefore, in a possible implementation of the present application, the lens adjustment method may further include:

[0032] The voltage difference applied between the first sub-electrode and the second sub-electrode is determined according to the optical power of the first liquid crystal region.

[0033] Therefore, 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 to form corresponding optical focal length.

[0034] In a possible implementation of the present application, the lens adjustment method may further include:

[0035] 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;

[0036] 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 first liquid crystal region.

[0037] In this way, the optical focal length of the first 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.

[0038] In a possible implementation of the present application, during specific implementation, the lens adjustment method may further include:

[0039] Obtaining fatigue state parameters of human eyes;

[0040] When the fatigue state parameter exceeds a preset threshold, the optical power of the adjustable area is controlled to change according to a preset range and / or speed.

[0041] Since the optical focal length of the adjustable area of ​​the first lens layer of the lens provided by the present application can be adjusted according to the viewing distance of the human eye, the human eye can be fatigue-trained by controlling the optical focal length of the adjustable area according to a preset zoom range and / or speed change according to the fatigue state of the human eye, so as to improve the symptoms of visual fatigue of the human eye.

[0042] In addition, when the fatigue state parameter exceeds a preset threshold, controlling the optical power of the adjustable area to change according to a preset range and / or speed may specifically include:

[0043] When fatigue status parameters exceed preset thresholds, a fatigue warning signal is issued;

[0044] Get user instructions;

[0045] When the user instructs to start fatigue adjustment training, the optical power of the adjustable area is controlled to change according to a preset range and / or speed.

[0046] In this way, eye fatigue training can be performed according to the needs of users to effectively improve the symptoms of eye fatigue.

[0047] In a possible implementation of the present application, the adjustable region further includes a second lens layer, and the first lens layer and the second lens layer are stacked; the second lens layer is a liquid crystal lens layer, and in the present application, the second lens layer may include a third substrate, a fourth substrate, a third electrode and a fourth electrode, wherein: the third electrode is arranged on the third substrate, the fourth electrode is arranged on the fourth substrate, and the fourth electrode includes a plurality of sub-electrode pairs, each sub-electrode pair includes a third sub-electrode and a fourth sub-electrode, the fourth sub-electrode is a ring electrode, and the third sub-electrode or the fourth sub-electrode of each sub-electrode pair is connected; for each sub-electrode pair, there is a voltage difference between the third sub-electrode and the fourth sub-electrode; a plurality of second liquid crystal regions are arranged between the third substrate and the fourth substrate, the plurality of second liquid crystal regions are arranged in one-to-one correspondence with the plurality of sub-electrode pairs, and the second sub-electrode pair of each sub-electrode pair is arranged corresponding to the edge of the second liquid crystal region; each second 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; then the lens adjustment method provided by the present application may further include:

[0048] Obtaining the position of the gaze point of the human eye on the second lens layer;

[0049] Determine the positions of the first optical zone and the second optical zone according to the position of the gaze point on the second 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;

[0050] Determine a second liquid crystal region included in the first optical zone and a second liquid crystal region included in the second optical zone according to positions of the first optical zone and the second optical zone;

[0051] The second liquid crystal region in the first optical zone and the second liquid crystal region in the second optical zone are controlled to form optical focal powers respectively, and the optical focal powers in the first optical zone and the second optical zone are different.

[0052] In this way, the positions 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 second liquid crystal layer. By controlling the second liquid crystal area in the first optical zone and the second liquid crystal area in the second optical zone to form corresponding optical focal lengths respectively, 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, 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 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.

[0053] In a possible implementation of the present application, the lens adjustment method may further include:

[0054] Acquiring the optical power of the first optical zone;

[0055] The optical power of the second optical zone is obtained.

[0056] Since the formation of the optical focal length of the first optical zone and the second optical zone is realized through the second liquid crystal region in the corresponding optical zone, the voltage difference applied to the corresponding second 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 second liquid crystal region, so that the liquid crystal molecules in the second liquid crystal region are reversely deflected to form the corresponding optical focal length.

[0057] In addition, obtaining the optical power of the first optical zone and obtaining the optical power of the second optical zone may include:

[0058] Obtaining a target defocus degree and a target diopter;

[0059] determining the optical power of the first optical zone according to the target diopter;

[0060] The optical power of the second optical zone is determined according to the target defocus power.

[0061] 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.

[0062] In a possible implementation of the present application, the above-mentioned controlling the second liquid crystal region in the first optical zone and the second liquid crystal region in the second optical zone to respectively form optical focal lengths may include:

[0063] 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 second liquid crystal region within the first optical zone;

[0064] Controlling the first sub-electrode and the second sub-electrode corresponding to the second liquid crystal region in the first optical zone to apply a first voltage difference to the second liquid crystal region in the first optical zone, so that the second liquid crystal region in the first optical zone forms an optical focal length;

[0065] 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 second liquid crystal region within the second optical zone;

[0066] The first sub-electrode and the second sub-electrode corresponding to the second liquid crystal region in the second optical zone are controlled to apply a second voltage difference to the second liquid crystal region in the second optical zone, so that the second liquid crystal region in the second optical zone forms optical power.

[0067] Since the optical focal length formed by each second liquid crystal region in the first optical zone and the second optical zone can be achieved by adjusting the voltage difference applied to the second liquid crystal region. Based on this, by adjusting the optical focal length of the second 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, multiple optical focal lengths that increase in sequence can be formed in the second optical zone in the direction from the first optical zone to the second optical zone. In addition, each optical focal length in the second optical zone can be formed by one or more second liquid crystal regions.

[0068] The lens provided in the present application can be applied to glasses, which generally include a frame and temples, and the lens can be connected to the frame and temples respectively. In addition, the glasses can also include a light source, so that the above-mentioned acquisition of the position of the human eye on the second lens layer can include:

[0069] Sending a light beam to the human eye through a light source;

[0070] Obtain the position of the bright spot formed by the light beam on the surface of the eyeball of the human eye;

[0071] Obtain the relative position between the pupil center and the bright spot;

[0072] The position of the gaze point on the lens is determined based on the relative position between the pupil center and the bright spot.

[0073] Since the gaze point falls on the first optical zone of the second lens layer of the lens, the position of the first optical zone on the second lens layer can be determined by determining the position of the gaze point on the second 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 lens 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 second lens layer 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.

[0074] In a third aspect, the present application further provides a control device for lens adjustment, which may include:

[0075] An acquisition module is used to acquire the viewing distance of human eyes, where the viewing distance of human eyes is the distance between the human eye and the target object that the human eye is gazing at;

[0076] The determination module is used to determine the optical power of the adjustable area according to the relationship function between the human eye viewing distance and the univariate multi-order polynomial, and the adjustable area is located in the first lens layer of the lens. The adjustable area can be a local visible area of ​​the first lens layer, such as the lower light area of ​​the first lens layer; in addition, the adjustable area can also be the entire visible area of ​​the first lens layer.

[0077] In a possible implementation of the present application, the relationship function of the univariate multi-time polynomial is obtained by fitting multiple sets of discrete data, and the discrete data includes the correspondence between the viewing distance of the human eye and the optical focal length.

[0078] By using the control device for lens adjustment provided by the present application, the optical power of the adjustable area of ​​the first 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 adjustable area of ​​the first 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.

[0079] The optical power of the human eye is affected by the depth of vision of the eye and the blur tolerance of the visual system, which usually follows the human eye accommodation stimulus-accommodation response curve. Since the human eye accommodation stimulus is the inverse of the distance at which the human eye sees objects, the human eye accommodation stimulus is different at different human eye viewing distances, and the corresponding adjustment hysteresis is also different, so that the optical power added to the adjustable area is different. Therefore, in a possible implementation of the present application, the determination module can also be used to determine the optical power of the adjustable area of ​​the lens according to the relationship function between the human eye viewing distance and a univariate multi-time polynomial. In order to facilitate the determination of the optical power of the adjustable area.

[0080] In a possible implementation of the present application, the acquisition module is also used to obtain fatigue status parameters of the human eye; the device also includes a control module, which is used to control the optical focal length of the adjustable area to change according to a preset range and / or speed when the fatigue status parameters exceed a preset threshold.

[0081] Since the optical focal length of the adjustable area of ​​the first lens layer of the lens provided by the present application can be adjusted according to the viewing distance of the human eye, the human eye can be fatigue-trained by controlling the optical focal length of the adjustable area according to a preset zoom range and / or speed change according to the fatigue state of the human eye, so as to improve the symptoms of visual fatigue of the human eye.

[0082] In a possible implementation of the present application, the lens may further include a second lens layer, the first lens layer and the second lens layer are stacked; the second lens layer is a liquid crystal lens layer, and the second lens layer includes a plurality of liquid crystal regions, wherein:

[0083] The acquisition module is also used to acquire the position of the gaze point of the human eye on the second lens layer;

[0084] The determination module is further used to determine the positions of the first optical zone and the second optical zone according to the position of the gaze point on the second lens layer, 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;

[0085] The determination module is further used to determine 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;

[0086] The device also includes a control module, which is used to control the liquid crystal area in the first optical zone to form a first optical focal length, and control the liquid crystal area in the second optical zone to form a second optical focal length, and the first optical focal length and the second optical focal length are different.

[0087] In this way, the position of the gaze point of the human eye on the second liquid crystal layer can be obtained by the acquisition module, and the position of the first optical zone and the second optical zone can be determined by the determination module. In addition, the second liquid crystal area of ​​the first optical zone and the second liquid crystal area in the second optical zone are controlled by the control module 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 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. In addition, the position of the gaze point of the human eye on the lens can change when the human eye looks at objects under different gaze angles, 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 gaze point of the human eye, so as to meet the personalized defocus blur tolerance requirements of the user, so as to effectively prevent and control myopia.

[0088] In the present application, controlling the liquid crystal region in the second optical zone to form the second optical power may include:

[0089] The control module is specifically used to control the second optical zone to form a plurality of second optical powers that increase in sequence in the direction from the first optical zone to the second optical zone, each second optical power being formed by one or more liquid crystal regions, so that the second optical zone can form a progressive defocus effect.

[0090] In a fourth 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. So that the optical focal length of the adjustable area of ​​the first 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 adjustable area of ​​the first 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.

[0091] In a fifth aspect, the present application provides a pair of glasses, which may include the control device of the fourth aspect, and the control device may be used to control the optical focal length of the adjustable area of ​​the first lens layer according to the viewing distance of the human eye, so that the adjustable area of ​​the first lens layer can adapt to the needs of changes in the human eye accommodation load at different viewing distances, thereby improving the myopia prevention and control effect of the lens.

[0092] In order to obtain the viewing distance of the human eye, in a possible implementation of the present application, the glasses may further include a distance measuring sensor, which may be but is not limited to being arranged on the frame, so as to measure the viewing distance of the human eye through the distance measuring sensor.

[0093] In addition, the glasses may further include a lens, a frame and temples. The lens may be connected to the frame and the temples. The glasses provided by the present application may have an adjustable area of ​​the lens with a focal length that may be changed according to a change in the viewing distance of the human eye in accordance with a univariate multi-time polynomial relationship function. Thus, the adjustable area of ​​the lens may be adapted to the needs of changes in the human eye's adjustment load at different viewing distances, thereby improving the myopia prevention and control effect of the lens of the glasses.

[0094] In a possible implementation of the present application, the second lens layer of the lens of the glasses may be a liquid crystal lens. In addition, in the direction from the central area to the peripheral area, the second lens layer includes a plurality of strip-shaped Fresnel lobes. The specific configuration of the second lens layer can refer to the above description and will not be repeated here.

[0095] The frame of the glasses may be provided with a first power supply contact, and the second power supply contact may be provided with a second power supply contact on the second lens layer. The second power supply contact may be provided in an annular structure. In this way, during the rotation of the second lens layer along the frame, the second power supply contact and the first power supply contact may always be in conductive contact, thereby forming an annular track power supply structure between the second lens layer and the frame. This structural form facilitates the relative rotation of the second lens layer and the frame, so that the axis position of the lens can be adjusted by rotating the second lens layer relative to the frame, so as to correct the astigmatism axis position of the lens.

[0096] 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, wherein the position of the bright spot is used to determine the position of the gaze point of the human eye on the lens.

[0097] In addition, the glasses may be provided with a battery, which can supply power to power-consuming devices on the glasses, such as a light source, a distance-measuring sensor or a control device, so as to ensure the normal operation of these devices.

[0098] In a sixth 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. This allows the optical power of the adjustable region of the first lens layer of the lens to change according to the change in the viewing distance of the human eye, in accordance with the univariate multi-time polynomial relationship function between the two. This allows the adjustable region of the lens to adapt to the needs of changes in the human eye's accommodation load at different viewing distances, thereby improving the myopia prevention and control effect of the lens.

[0099] In the seventh aspect, the present application also provides a computer-readable storage medium, which includes a program. When the program is run on a computer, the computer can execute the method described in the second aspect. So that the optical focal length of the adjustable area of ​​the first 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 adjustable area 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0100] Figure 1 A schematic diagram of an application scenario of a lens provided in an embodiment of the present application;

[0101] Figure 2 A side view of glasses provided by an embodiment of the present application;

[0102] Figure 3A schematic diagram of the structure of a first lens layer provided in one embodiment of the present application;

[0103] Figure 4 A graph of an optical human eye accommodation stimulus-accommodation response curve provided in an embodiment of the present application;

[0104] Figure 5 A schematic diagram of the lead and lag of human eye accommodation provided in an embodiment of the present application;

[0105] Figure 6 A schematic diagram of the structure of a lens provided in one embodiment of the present application;

[0106] Figure 7 A schematic diagram of the structure of a traditional progressive lens provided in an embodiment of the present application;

[0107] Figure 8a A schematic diagram of the structure of a traditional solid concave lens provided in one embodiment of the present application;

[0108] Figure 8b A schematic structural diagram of a conventional liquid crystal lens adopting Fresnel type distribution provided in an embodiment of the present application;

[0109] Fig. 9 A schematic diagram of the structure of a conventional Fresnel-type liquid crystal lens provided in an embodiment of the present application;

[0110] Fig.10 A relationship curve between the center-to-edge extension length of each annular Fresnel lobe and the applied voltage difference provided in an embodiment of the present application;

[0111] Fig.11 A schematic diagram of the structure of a liquid crystal lens provided in one embodiment of the present application;

[0112] Fig.12 A schematic diagram of the structure of a first lens layer provided in one embodiment of the present application;

[0113] Fig.13 A schematic diagram of the structure of a lens provided in another embodiment of the present application;

[0114] Fig.14 A flow chart of a lens adjustment method provided in one embodiment of the present application;

[0115] Fig.15 A schematic diagram of a partial structure of glasses provided in one embodiment of the present application;

[0116] Fig.16 A function curve diagram of the light addition amount and the adjustment stimulus provided in an embodiment of the present application;

[0117] Fig.17 A schematic diagram of the structure of a lens provided in another embodiment of the present application;

[0118] Figures 18a to 18d A schematic diagram of the structure of a first lens layer with different optical powers provided in one embodiment of the present application;

[0119] Fig.19 A schematic diagram of human eye astigmatism provided by an embodiment of the present application;

[0120] Fig. 20 A schematic diagram of the structure of a lens provided in another embodiment of the present application;

[0121] Fig.21 A schematic structural diagram of a conventional cylindrical liquid crystal lens of Fresnel type design provided in one embodiment of the present application;

[0122] Fig. 22 A schematic diagram of a method for forming a second lens layer provided in one embodiment of the present application;

[0123] Fig.23 A schematic diagram of the structure of glasses provided in another embodiment of the present application;

[0124] Fig.24 A schematic diagram of the pupil center-bright spot center vector provided in an embodiment of the present application.

[0125] Reference numerals:

[0126] 1-lens frame; 101-mounting hole; 102-first power supply contact; 2-lens; 2a-first lens layer; 2b-second lens layer;

[0127] 201a-first substrate; 201b-second substrate; 202a-first electrode; 202b-second electrode; 2021-first sub-electrode;

[0128] 2022 - second sub-electrode; 203 - liquid crystal region; 204 - annular Fresnel lobe; 2041 - annular sub-Fresnel lobe;

[0129] 205-optical liquid; 206-strip Fresnel lobe; 2061-strip sub-Fresnel lobe; 207-second power supply contact;

[0130] 208- fixation point; 3- temple; 4- driving device; 5- battery; 6- distance sensor; 7- eye fatigue monitoring sensor;

[0131] 8-cornea; 801-bright spot; 9-lens; 10-pupil; 11-camera; 12-light source. DETAILED DESCRIPTION

[0132] 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.

[0133] 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. Among them, the cause of myopia is mostly due to the excessive length of the anterior-posterior axis of the eyeball (called axial myopia), followed by a strong refractive power of the eye (called curvature myopia).

[0134] 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.

[0135] Currently, 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.

[0136] In order to effectively prevent and control myopia, a near vision addition method based on optical technology has been proposed, wherein near vision addition (ADD) usually refers to near vision addition, which is the absolute value of the difference between the lens's distance power and near power. Near vision addition can reduce the burden of eye adjustment for a long time. It divides the lens into multiple upper and lower light zones, so that the upper light zone is used to see far and the lower light zone is used to see near. The lower light zone can transform both eyes from a relatively focused near-sighted state to a relatively relaxed far-sighted state, relieve and eliminate near vision fatigue caused by near vision, and effectively achieve the purpose of preventing and controlling the occurrence and development of myopia. Based on this, some eyewear manufacturers have also launched bifocal myopia glasses that increase the diopter in the lower light zone. The myopia glasses adopt an upper and lower light zone lens structure, with the upper light zone used for far vision and the lower light zone used for near vision. Clinical experiments have shown that the bifocal myopia glasses can delay the growth of myopia by about 0.5D per year compared with single-vision glasses.

[0137] However, the current bifocal myopia glasses have a fixed light addition value in the lower light zone, which cannot adapt to the changing requirements of the human eye's adjustment load at different viewing distances, thus affecting the user's wearing comfort and having a poor effect on the prevention and control of myopia in the human eye.

[0138] The lens provided in this application aims to solve the above problems. The optical power of the lower optical zone of the lens can be flexibly adjusted according to the viewing distance of the human eye to meet the needs of the change of the adjustment load of the human eye at different reading distances, thereby playing an effective role in preventing and controlling myopia. In addition, in this application, the central area of ​​the lens can be understood as the gaze area of ​​the user on the lens when looking at a distance; and the peripheral area can be understood as the area located on the periphery of the central area.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] Reference Figure 1 , Figure 1 This is a schematic diagram of an application scenario of a lens provided in an embodiment of the present application. Figure 1 The embodiment shown shows a structure of glasses, which may include a frame 1 and a lens 2. The lens 2 is fixed to the frame 1. In addition, the glasses may also include temples 3, which may be referred to as Figure 2 , Figure 2 The side view of the glasses provided by an embodiment of the present application is shown. In this way, the lens 2 can be connected to the frame 1 and can also be connected to the temple 3, and the connection method can be but not limited to threaded connection.

[0143] exist Figure 1 In the embodiment shown, the frame 1 may have two mounting holes 101, and the two mounting holes 101 may be symmetrically arranged. In addition, there are two lenses 2, and the two lenses 2 are mounted in the two mounting holes 101 of the frame 1 in a one-to-one correspondence. The shape of the lens 2 may be, but is not limited to, a regular shape such as a circle or a square, or may be some possible irregular shapes to increase the diversity of the shape of the lens 2, thereby increasing the user's selectivity and improving the user's experience. Figure 1 and Figure 2 , the temple 3 can be indirectly connected to the lens 2 through the frame 1. In some other possible embodiments, the frame 1 can also be a connecting structure arranged between two lenses 2, and the temple 3 can be directly connected to the lens 2.

[0144] In the present application, the lens 2 includes at least one lens layer, for example, a first lens layer 2a. Figure 3 , Figure 3 The schematic diagram of the structure of the first lens layer 2a provided by a possible embodiment of the present application is shown. Figure 3In the illustrated embodiment, the first lens layer 2a is a liquid crystal lens layer, and the first lens layer 2a may include a first substrate 201a, a second substrate 201b, a first electrode 202a, and a second electrode 202b. The first electrode 202a is disposed on the first substrate 201a, the second electrode 202b is disposed on the second substrate 201b, and a liquid crystal region 203 is disposed between the first substrate 201a and the second substrate 201b.

[0145] It is understandable that the lens 2 has a high requirement for light transmittance. In the present application, the material of the lens 2 can be selected as a transparent material. Exemplarily, the first substrate 201a and the second substrate 201b can be made of transparent materials such as, but not limited to, polyethylene terephthalate (PET), polyethylene naphthalate diformic acid glycol ester (PEN), polyimide (PI), polydimethylsiloxane (PDMS), etc. In addition, the first electrode 202a and the second electrode 202b can be transparent conductive electrodes, and their materials can be, for example, transparent conductive oxides (TCO), such as indium tin oxide (ITO); or conductive polymers, metal nanowires, metal grids, graphene, carbon nanotubes, metals or alloys or metal oxides, etc.

[0146] You can continue to refer to Figure 3 In the present application, the voltage applied to the first electrode 202a and the second electrode 202b can generate a corresponding electric field between the first substrate 201a and the second substrate 201b. Figure 3 In the embodiment shown, when different voltages are applied to different regions of the first lens layer 2a, voltage differences and electric field gradient distributions can be formed in different regions. The electric field can act on the liquid crystal region 203, and the liquid crystal molecules in the liquid crystal region 203 can be adaptively deflected under the action of the corresponding electric field.

[0147] In order to apply corresponding voltages to the first electrode 202a and the second electrode 202b, it is possible to continue to refer to Figure 2 A driving device 4 may be provided on the glasses, and the driving device 4 may be, but is not limited to, provided on the frame 1 or the temple 3 of the glasses.

[0148] 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 1 In the mirror frame 1 shown, it can also be arranged as follows Figure 2The control device can be used to control the working process of the above-mentioned driving device 4, so as to adjust the voltage applied to the first electrode 202a and the second electrode 202b, so that the liquid crystal area 203 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 optical focal length of the liquid crystal area 203 set by the user, and control the above-mentioned driving device 4 to start according to the optical focal length of the liquid crystal area 203 obtained, so as to apply a corresponding voltage to the first electrode 202a and the second electrode 202b. In addition, the memory can be used to store the optical focal length 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 an electrically erasable programmable read only memory (EEPROM) and a hard disk drive, etc.

[0149] In addition, a battery 5 may be provided on the frame 1 or the temple 3 of the glasses, and the battery 5 may be used to supply power to the driving device 4, the control device or other power modules of the glasses.

[0150] In the present application, the first lens layer 2a has an adjustable area, and the adjustable area can be a local area of ​​the first lens layer 2a, such as the lower light-adding area of ​​the first lens layer 2a. In the present application, the lower light-adding area refers to the area of ​​the lens 2 for users to use for close-up vision. In addition, the adjustable area can also be the entire visible area of ​​the first lens layer 2a. Then at least part of the liquid crystal area 203 can be located in the adjustable area of ​​the first lens layer 2a, so that when an electric field is formed in the liquid crystal area 203, the liquid crystal molecules in the liquid crystal area 203 located in the adjustable area can be deflected under the action of the electric field, thereby forming a corresponding optical focal length in the adjustable area. In the present application, by reasonably setting the adjustable area, the optical focal length formed in the adjustable area can meet the user's needs for close-range vision adjustment, thereby achieving an effective myopia prevention and control effect.

[0151] In order to adjust the optical focal length of the adjustable region, in a possible embodiment of the present application, the second electrode 202b of the first lens layer 2a may include a sub-electrode pair, the sub-electrode pair including a first sub-electrode 2021 and a second sub-electrode 2022, and by adjusting the voltage applied to the first sub-electrode 2021 and the second sub-electrode 2022, a voltage difference may be formed between the first sub-electrode 2021 and the second sub-electrode 2022. In addition, the liquid crystal molecules in the liquid crystal region 203 may be deflected with the voltage difference applied between the first sub-electrode 2021 and the second sub-electrode 2022, thereby forming an optical focal length in the adjustable region.

[0152] It can be understood that in the present application, the deflection direction and angle of the liquid crystal molecules in the adjustable region can be adjusted by changing the voltage difference applied between the first sub-electrode 2021 and the second sub-electrode 2022, thereby adjusting the optical focal length formed in the adjustable region. In this way, the optical focal length of the adjustable region can be adjusted according to the viewing distance of the user, thereby meeting the user's needs for adjustment load changes at different viewing distances, thereby achieving an effective myopia prevention and control effect.

[0153] It is worth mentioning that when users look at objects at different distances (i.e., applying different accommodation stimuli to the eyes), the amount of adjustment of the human eye's optical focal length (i.e., accommodation response) does not conform to the value calculated by optical theory, but is affected by the depth of field of the eye and the blur tolerance of the visual system. It usually follows the following formula: Figure 4 The optometric human eye accommodation stimulus-accommodation response curve shown in FIG. Figure 4 The dotted lines in the figure are theoretical conditioning responses corresponding to different conditioning stimuli. Figure 4 The solid lines in the figure are the actual regulatory responses corresponding to different regulatory stimuli.

[0154] Take the case of looking at an object at a distance of 0.33m as an example. Figure 4 The dotted line in the figure shows that the human eye's accommodation response is theoretically 3D diopter, which can image the object on the retina. However, the actual human eye's accommodation response is as follows: Figure 4 As shown by the solid line in the figure, it is smaller than the theoretical value, which causes the object to be imaged behind the retina, forming hyperopic defocus. This phenomenon is called accommodation lag. On the contrary, the actual human eye accommodation response is greater than the theoretical value, which is called accommodation advance. Figure 5 , Figure 5 A schematic diagram of the lead and lag of human eye accommodation provided by an embodiment of the present application. In which, the image of point B is located on the retina, and the image of point C is behind the retina, forming a hyperopic defocus; the image of point A is in front of the retina, forming a myopic defocus. In addition, from Figure 4 It can be seen from the optometric human eye accommodation stimulus-accommodation response curve that the closer the object is to the human eye, the greater the accommodation lag.

[0155] It is understandable that by adding light to the lens (i.e., adding positive focal power), the object light will converge in advance before entering the human eye, thereby reducing the amount of accommodation stimulation. Figure 4The displayed accommodation stimulus-accommodation response curve also reduces the accommodation lag accordingly. In addition, some related studies have also proved that the accommodation lag of the eyes is reduced after adding positive diopter. For example, in the binocular vision state with full correction and +0.75D of added light, the visual target is placed at a distance of 50cm, 40cm, 33cm, 25cm, and 20cm to measure the accommodation lag of the left and right eyes. It is found that the accommodation lag at each distance is reduced. Based on this, myopic patients can wear lenses with +0.75D of added light to slow down the further progression of myopia when the myopia accommodation amplitude is normal, and it is more effective for esotropia.

[0156] In addition, there are studies on myopic patients wearing normal myopia glasses and myopic glasses with +2.5D and +1.5D light addition. A three-year randomized controlled clinical study was conducted. The results showed that the average progression of myopia was: the myopia of patients wearing +2.5D light addition glasses increased by 60 degrees, the myopia of patients wearing +1.5D light addition glasses increased by 89 degrees, and the myopia of patients wearing normal non-light addition glasses increased by 105 degrees. It can be seen that adding a certain amount of light to the lens on the basis of the normal correction degree can effectively delay the deterioration of myopia, and the higher the amount of light addition, the better myopia prevention and control effect can be obtained in myopia progression. However, if the amount of light added is too high, the patient will give up using it because of intolerance and discomfort; if the amount of light added is too low, it will not have enough effect on the adjustment lag and its efficacy will also be reduced. If the amount of light added is too high or too low, it will cause unsatisfactory myopia prevention and control effect.

[0157] From the above Figure 4 According to the optical human eye accommodation stimulus-accommodation response curve, the accommodation stimulus is different at different eye distances, and the corresponding accommodation hysteresis is also different. Based on this, in this application, the accommodation hysteresis at multiple different distances can be measured, and then a mathematical function can be fitted to predict the amount of light added at different eye distances of the user. In specific implementation, the above Figure 4 It can be seen from the displayed adjustment stimulus-adjustment response curve that the dependent variable adjustment response y and the independent variable adjustment stimulus x present a univariate regression relationship. Therefore, in this application, a univariate multi-time polynomial can be used to fit the adjustment response y and the independent variable adjustment stimulus x, as shown in the following formula:

[0158]

[0159] Where n represents the order of the polynomial, x k Represents x to the kth power, and a represents the coefficient of the polynomial. Some studies have measured continuous accommodative stimulus change data and used a cubic equation function to fit the accommodative stimulus-accommodative response curve, which confirms the feasibility of using a univariate multi-time polynomial model.

[0160] Since the adjustment lag is the difference between the adjustment stimulus x and the adjustment response y, the adjustment lag is:

[0161]

[0162] From the above relationship, we can know that there is still a univariate multi-time polynomial model relationship between the accommodation lag and the accommodation stimulus x. In addition, some studies have shown that the range of the optimal amount of light added is between the determined value of the accommodation lag and the measured value of the heterophoria, and that the optimal amount of light added is linearly correlated with the initial accommodation lag and the initial heterophoria state. The value range given by statistical analysis is [1.31+0.45×initial accommodation lag value, 1.47+0.09×initial near heterophoria value]. Taking the determination of the amount of light added by accommodation lag as an example, the acquisition method can adopt "lag=0", that is, light addition compensation until the near accommodation lag is 0D. Studies have found that when using the eyes at close range, the amount of light added ADD that makes the accommodation lag zero is related to the initial accommodation lag lag, and follows a linear relationship:

[0163] ADD=1.31+0.45lag

[0164] For example, if the subject's initial accommodation lag is 0.73D and the initial near heterophoria is +6PD, when the light addition is 1.64D, the accommodation lag is 0D. When the initial near heterophoria is taken into account, the optimal light addition is 2.02D. Taking both accommodation lag and near heterophoria into account, the most suitable light addition range is [1.64D, 2.02D]. From the aforementioned accommodation lag and accommodation stimulus x (the inverse of the viewing distance) presenting a univariate multi-time polynomial function relationship, it can be deduced that:

[0165] ADD=1.31+0.45×{-a0-(a1-1)x-a2x 2 -…-a n x n}x≤2D

[0166] It can be seen from the above formula that the amount of light added ADD and the accommodative stimulus x also conform to a univariate multi-time polynomial function relationship. Therefore, through the above analysis of the present application, it can be deduced that the amount of light added and the accommodative stimulus when using the eyes at a close distance (≤1m) conform to a univariate multi-time polynomial function relationship model.

[0167] In addition, it can be understood that based on the above-mentioned one-variable multi-time polynomial function relationship model between the light addition amount and the accommodation stimulus, by measuring the light addition amount at at least 4 different distances (the light addition amount when the accommodation lag is 0), a one-variable multi-time polynomial function model of the light addition amount and the accommodation stimulus (the inverse of the distance) can be fitted, and this function model can be used to predict the light addition amount at other different eye distances of the user. Figure 4It can be seen from the optometric human eye accommodation stimulus-accommodation response curve shown that the accommodation lag decreases with the increase of the eye use distance. When the eyes are used at a long distance (>50cm), the added light can be cancelled to ensure the clear distance vision of the human eye.

[0168] In addition, in the present application, the method of improving the clarity of vision of the human eye by changing the amount of added light can also be applied to the field of presbyopia correction. However, due to the different mechanisms of presbyopia correction and myopia prevention and control, the relationship models between the amount of added light and the accommodative stimulus used by the two are different. Among them, presbyopia is a decline in the eye's ability to adjust, which causes difficulty in near vision, and it requires the addition of a convex lens to have clear near vision. Traditional presbyopia correction glasses use convex lenses with fixed degrees, which are difficult to meet the needs of different close-range eye use. After a large number of clinical trial statistics, some researchers have proposed that the accommodative power of the human eye decreases with age, where the average accommodative power = 18.5D-(0.30)×age. For example, the average accommodative power of a 60-year-old population is 0.5D, and the closest distance that can be seen clearly using this accommodative power is 2m. Since the amount of light added for presbyopia correction follows the half-accommodative reserve principle, that is:

[0169]

[0170] It can be seen that at a reading distance of 40cm, the amount of light added when the accommodation power of a 60-year-old person is 0.5D is:

[0171]

[0172] The amount of added light is 2.25D, and its adjustment range is [2.25D, (2.25+0.5)D], corresponding to a clear close-up eye distance of [44.4cm, 36.4cm]. However, the fixed amount of added light is neither suitable for the different close-up eye needs of the human eye in multiple scenarios such as using mobile phones, computers, reading, etc., nor can it adapt to the worsening trend of decreased accommodation as people age.

[0173] The method for dynamically adjusting the amount of light added for presbyopia proposed in the present application is to pre-measure and set the accommodative force. When in use, it can dynamically measure the near-distance viewing distance of the human eye in real time, and dynamically adjust the amount of light added based on the accommodative force and the viewing distance in accordance with the principle of half-accommodative reserve. In specific implementation, the setting command of the accommodative force can be transmitted through an external terminal device or through intelligent interactive perception. Taking intelligent interactive perception as an example, the user looks at the target at a natural reading distance, and his eyes gradually increase the optical focal length in steps of 0.25D until the target is blurred, and the optical focal length at this time is recorded as the positive relative accommodation amount NRA. Then, the optical focal length is gradually reduced in steps of 0.25D until the target is blurred, and the optical focal length at this time is recorded as the negative relative accommodation amount PRA. In this way, half of the sum of the negative relative accommodation amount NRA and the positive relative accommodation amount PRA can be taken as the amount of light added by the lens for presbyopia correction, that is:

[0174]

[0175] By using the lens provided by the present application, different voltage differences are applied to the liquid crystal area located in the adjustable area so that the liquid crystal area forms a corresponding optical power, thereby meeting the needs of myopic patients for changes in the adjustment load of the eyes at different close distances, so as to achieve the purpose of effective myopia prevention and control. In addition, for presbyopic patients, the optical power of the lower optical area can be adjusted for patients of different ages to meet the eye needs of patients in different close-distance scenes, thereby improving the adjustment power of the eyes of presbyopic patients.

[0176] Reverse-slap training is another method of myopia prevention and control proposed based on optical technology. The traditional reverse-slap is an eye care tool for vision training, which can train eye muscles for a short time as needed to relieve fatigue. The reverse-slap can be composed of two pairs of positive and negative lenses with equal degrees. By switching between positive and negative lenses, it can fully mobilize the potential of the eyes themselves, improve the adjustment ability of the ciliary muscles, and relieve eye fatigue. At present, the reverse-slap has moved from manual flipping to automatic flipping, solving the problems of manual reverse-slap being boring, monotonous and tiring, and difficult to persist in using. It can even be used flexibly in normal close-range eye use scenarios (reading, using mobile phones and tablets, etc.). However, the training amplitude of the automatic reverse-slap is fixed and the volume is large. It still exists as an independent training device and cannot be integrated into existing myopia glasses products. In recent years, some literature has recorded that randomized patient experiments have shown that reverse-slap training has improved the flexibility of visual adjustment and improved the eye conditions of adolescents with symptoms of visual fatigue when looking at close objects. In addition, there are also documents that show that targeted visual function training can improve the adjustment function and significantly improve the symptoms of visual fatigue.

[0177] From the introduction of the lens 2 provided by the present application in the above embodiment, it can be known that the optical focal length of the first lens layer 2a of the lens 2 located in the adjustable area can change with the change of the corresponding voltage difference. Based on this, by applying voltage differences of different sizes and different positive and negative voltage differences to the adjustable area, the reverse beat training of the eyes can be realized according to the state of eye fatigue. In specific implementation, the optical focal length of the liquid crystal area 203 of the adjustable area can be changed according to the preset zoom range and / or zoom speed by designing the voltage difference. For example, the eye fatigue training can be carried out in a way that the optical focal length changes from small to large in a step-by-step manner. For example, the optical focal length of the liquid crystal area 203 gradually increases from ±0.5D, ±1.0D, ±1.5D, ±2.0D to ±2.5D, and then decreases to ±0.5D step by step. In addition, it can be preset to perform 1 minute of reverse beat training at each zoom step before entering the next step for training, wherein it can also be preset to perform 8 cycles of positive and negative optical focal length flipping at each step as the speed of reverse beat training. The method of stepped progressive zoom is used to train the eyes through reverse shooting, taking into account the user's needs for different training ranges.

[0178] By using the lens 2 provided in the present application, since the optical focal length of the adjustable area of ​​the lens 2 can be changed in steps, the reverse-snap training of the eyes can be realized, and thus the volume of the lens 2 can be designed to be smaller to improve the wearing comfort of the user.

[0179] In addition, the lens 2 provided in the present application integrates functions such as myopia correction, presbyopia correction, and reverse shooting training, which can meet the various vision adjustment needs of different users. Its application scope is wider, so as to effectively improve the user experience.

[0180] The lens 2 provided in the present application may include the first lens layer 2a mentioned above, and may also be stacked with other lens layers. Figure 6 , Figure 6 A schematic diagram of the structure of a lens 2 provided in an embodiment of the present application. In this embodiment, the lens 2 also includes a second lens layer 2b, which is a traditional solid concave lens. The second lens layer 2b can be formed by grinding according to the user's myopia degree, astigmatism, and astigmatism axis, and can be used to correct myopia and astigmatism. The first lens layer 2a can provide additional light in the adjustable area and / or realize eye fatigue reverse shooting training by reversing the positive and negative optical focal lengths based on the myopia correction of the second lens layer 2b.

[0181] You can continue to refer to Figure 6In this embodiment, the second lens layer 2b is a single concave geometric optical lens, which 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 second surface can be attached and connected to the first substrate 201a of the first type of lens. In some other embodiments, the first lens layer 2a is only arranged on the side of the second surface of the second lens layer 2b away from the first surface, and the first lens layer 2a and the second lens layer 2b are not in contact or connected.

[0182] From the above embodiments, it can be known that the light addition under near vision and the reverse shooting training are both used for close-up eye use scenarios. Since the line of sight can pass through the adjustable area of ​​the lens 2 in close-up eye use scenarios, myopia correction can be achieved by adding optical power to the adjustable area.

[0183] However, if a small-aperture liquid crystal lens (aperture diameter ≥ 10 mm) is arranged only in the adjustable area of ​​the lens 2 (such as the lower light area), it is similar to Figure 7 The conventional progressive lens of the near-viewing area shown in the figure. In this way, when the user switches from a close-up eye scene to a long-distance eye scene, image jump interference will occur, thereby affecting the user's experience. In order to solve this problem, a liquid crystal lens with a larger aperture can be used in the present application. As the aperture size increases, the generation of image jump interference can be reduced to improve the comfort of human eye use.

[0184] Since the voltage difference mainly affects the changing trend of the voltage distribution, and the voltage frequency mainly affects the flatness of the voltage distribution, the voltage amplitude and the voltage frequency combination and interaction determine the actual voltage difference and distribution of the lens. Different electric field distributions are formed in the liquid crystal region according to the applied voltage amplitude and voltage frequency, and the liquid crystal molecules form different curve deflection distributions accordingly. Different regions constituting the lens 2 have different curvature distributions, thereby forming different optical powers. The maximum optical power that the liquid crystal molecules can form 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:

[0185]

[0186] In a specific application scenario, the material properties of the liquid crystal molecules, the thickness of the liquid crystal layer and the lens aperture are known, and the optical focal length can be adjusted within the above-mentioned limit range by controlling the voltage difference and the voltage frequency.

[0187] Taking the birefringence of common liquid crystal materials Δn≤0.3, thickness d≤30μm, and lens aperture radius 5mm (corresponding to diameter 10mm), we can calculate:

[0188]

[0189] From the above formula, we can know that when the aperture of the traditional liquid crystal lens doubles, the focal length quickly decreases to one-fourth of the original. When the radius of the aperture of the traditional liquid crystal lens is 5mm, its maximum focal length is only 0.72D. The zoom degree of the liquid crystal lens obtained by the traditional geometric optical design is too small to meet the zoom range requirements.

[0190] In order to expand the zoom range of the lens, the first lens layer 2a of the lens 2 provided in 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 Figure 8a , Figure 8a The structure of a conventional solid concave lens provided by a possible embodiment of the present application is shown. Figure 8b , Figure 8b The structure of a conventional liquid crystal lens using a Fresnel type distribution is shown. Figure 8b In the embodiment, the excess material on the surface of the liquid crystal lens is removed, and only the multiple annular regions (also called annular Fresnel lobes 204) divided from the central region to the peripheral region of the liquid crystal lens are retained. An annular groove is formed between two adjacent annular Fresnel lobes 204, and the surface of each Fresnel lobe retains the original curvature. At this time, the liquid crystal lens looks like Figure 8b The continuous surface of the liquid crystal lens shown is "collapsed" to the same plane at each division to form a series of sawtooth-shaped annular grooves.

[0191] Since the Fresnel liquid crystal lens uses transparent conductive electrodes to divide the entire lens from the central area to the peripheral area into multiple annular Fresnel lobes 204, annular electrodes are provided at the inner and outer rings of each annular Fresnel lobe 204. In this way, by applying voltage between two electrodes in the direction from the central area to the peripheral area of ​​the lens, annular Fresnel lobe-shaped refractive index distributions can be formed between the lens center and the first annular electrode and between the two annular electrodes, such as Fig. 9 As shown, Fig. 9 The schematic diagram of the structure of a conventional Fresnel-type liquid crystal lens provided in an embodiment of the present application is shown. In this embodiment, the lens as a whole constitutes a spherical liquid crystal lens with a relatively large aperture, and each Fresnel lobe of the spherical liquid crystal lens satisfies the following relationship:

[0192]

[0193] R1 is the outer radius of the first annular Fresnel lobe 204, and Rn is the outer radius of the nth annular Fresnel lobe 204. Then the width Ln of each annular Fresnel lobe 204 is:

[0194]

[0195] It can be known from the above formula that the width of the annular Fresnel lobe 204 decreases in the direction from the central area to the peripheral area, and the width of the annular Fresnel lobe 204 is larger as it is closer to the central area. Liquid crystal molecules are polarized under the action of the electric field to generate optical focal length, and the voltage difference between the annular electrodes and the optical focal length of the annular Fresnel lobe 204 formed by them are approximately linearly related. The electric field distribution of the ideal liquid crystal lens is a parabolic gradual change, as shown below: Fig.10 As shown by the solid line in Fig.10 The relationship between the center-to-edge extension length of each annular Fresnel lobe and the applied voltage difference is shown. The wider the annular Fresnel lobe 204 is, the less ideal the electric field distribution is because its control electrodes are farther apart.

[0196] In addition, taking the annular Fresnel lobe located in the center as an example, when a voltage difference is applied between the center of the lens and the first annular electrode, the constructed voltage distribution is a linear distribution (e.g. Fig.10 However, the liquid crystal lens can be equivalent to Fig.11 The actual voltage distribution of the RC circuit shown in the figure presents a concave curve distribution (such as Fig.10 The wider the annular Fresnel lobe is, the greater the impact on the imaging quality is.

[0197] Reference Fig.12 As shown, Fig.12 A schematic diagram of the structure of the first lens layer 2a provided in a possible embodiment of the present application is given. Fig.12 and Figure 8b By comparison, it can be seen that Fig.12 In the embodiment shown, the above Figure 8b At least one of the relatively wide annular Fresnel petals 204 in the illustrated embodiment is further divided into a plurality of narrow Fresnel petals by a Fresnel design to form annular sub-Fresnel petals 2041. Since the electrode spacing of each annular sub-Fresnel petal 2041 is reduced after the division, the first lens layer 2a can form a parabolic electric field distribution curve as a whole, which is similar to the above-mentioned Figure 8b Compared with the first lens layer with a wider annular Fresnel lobe 204 as shown in FIG, the imaging quality is significantly improved.

[0198] Reference Fig.13 , Fig.13 Reason Fig.12The lens 2 is formed by combining the first lens layer 2a and the second lens layer 2b shown in the figure, wherein the second lens layer 2b is a solid concave lens layer. The lens 2 provided in this embodiment, the second lens layer 2b is used for myopia correction and astigmatism correction, and the first lens layer 2a can provide additional light in an adjustable area (such as the lower light area) and / or realize the function of eye fatigue reverse shooting training through positive and negative optical focal reversal zooming. Moreover, the lens 2 has a better imaging quality in any working mode.

[0199] In addition, Fig.13 When the lens 2 shown is used in zoom glasses, the amount of light added in the adjustable area can be adjusted according to the eye distance to meet the requirements of optical focal length at different eye distances; and the eye fatigue state can be monitored to provide corresponding reverse shooting fatigue relief training. Fig.14 , Fig.14 A flowchart of a lens adjustment method provided for a possible embodiment of the present application.

[0200] The first step is to obtain the human eye viewing distance and eye fatigue state parameters through intelligent perception. The human eye viewing distance is the distance between the human eye and the target object that the human eye is looking at. The human eye viewing distance can be obtained by wireless telemetry, which can be but not limited to various distance measuring sensors 6 based on infrared and ultrasonic technologies. The distance measuring sensor 6 can be set at a corner of the glasses. In addition, since the space between the frame 1 and the temple 3 of the glasses is relatively large, in some embodiments of the present application, the distance measuring sensor 6 can be set at a corner of the glasses. Fig.15 , Fig.15 The schematic diagram of the partial structure of the glasses provided by an embodiment of the present application is shown. In this embodiment, the distance measuring sensor 6 can also be arranged at the connection between the frame 1 and the temple 3, and it can also match the pattern on the frame 1 or the temple 3 to have good concealment and aesthetics.

[0201] In the present application, the eye fatigue state can be a rough judgment of the distance and duration of close-range eye use, or it can be a judgment of the acquisition of eye activity information such as blinking frequency and eye opening degree. Among them, the acquisition of eye activity information can use an eye fatigue monitoring sensor 7 based on technologies such as electrooculography and visual cameras. The eye fatigue monitoring sensor 7 can also be, but is not limited to, set at a corner of the lens 2 or at the connection between the frame 1 and the temple 3.

[0202] In this way, in the process of real-time monitoring of fatigue status, a period of time can be used as a sliding window (for example, 45 minutes), and the proportion of close-range eye use (for example, ≤50cm) can be counted by sliding minute by minute. In this application, this proportion can be used as a fatigue status parameter. When the fatigue status parameter exceeds a preset threshold (for example, 90%), a fatigue warning signal is issued. Among them, the fatigue warning signal can be, but is not limited to, one or a combination of multiple of sound, vibration or light.

[0203] In the second step, the processor of the glasses can read multiple sets of discrete point data (for example, at least 4 sets) that are pre-measured and stored from the memory. These discrete point data consist of the adjustment stimulus (the inverse of the distance of the human eye viewing the object) and the corresponding light addition amount (optical focal length). According to the above analysis, the light addition amount and the adjustment stimulus present a univariate multi-time polynomial function model. The coefficients of the univariate multi-time polynomial function can be analyzed using the above multiple sets of discrete point data. In this way, by detecting the distance of the human eye viewing the object, and according to the distance of the human eye viewing the object and the univariate multi-time polynomial function, the light addition amount corresponding to the distance of the human eye viewing the object can be solved, thereby determining the optical focal length of the adjustable area.

[0204] For example, in a possible embodiment, the amount of light added at three human eye viewing distances of 50 cm (equivalent to 2D accommodation stimulation), 33 cm (equivalent to 3D accommodation stimulation) and 20 cm (equivalent to 5D accommodation stimulation) can be measured through optometry, and the amounts of light added are 1.5D, 1.75D and 2D respectively, and then the three discrete points are pre-stored in the memory of the glasses provided in this application. Referring to Table 1, Table 1 shows the corresponding relationship between the viewing distance of each human eye and the amount of light added in this embodiment.

[0205] Table 1

[0206] Modulation stimulus (D) 1 2 3 5 Added light (D) 1.25 1.5 1.75 2

[0207] In this way, the processor can read the discrete point data in Table 1 above and substitute it into the following cubic equation function:

[0208] y=ax 3 +bx 2 +cx+d

[0209] Where y is the amount of added light, x is the adjustment stimulus, and by substituting three discrete points, the coefficients of the cubic equation function are obtained:

[0210] a=-0.0104; b=0.0625; c=0.1353; d=1.0626

[0211] The corresponding function curve is available Fig.16 express.

[0212] On this basis, when using the eyes at close range (e.g. ≤1m), the viewing distance of the human eye is measured and converted into an accommodation stimulus (the inverse of the viewing distance of the human eye). For example, if the viewing distance of the human eye is 25cm, the accommodation stimulus corresponds to 4D. Substituting it into the above-mentioned univariate multi-time polynomial function relationship model, the amount of added light can be calculated as:

[0213] y=-0.0104×4 3 +0.0625×42 +0.1353×4+1.0626=1.94D

[0214] Step 3: The processor sends a fatigue warning signal to the user according to the human eye fatigue state measured by the eye fatigue monitoring sensor 7. The user can set the reverse beat training speed and amplitude through the external terminal device and send it to the processor of the glasses through wireless signal transmission. The processor can start the fatigue adjustment training according to the reverse beat training speed and amplitude instructions set by the user.

[0215] In a possible embodiment of the present application, the user can start the fatigue adjustment training by touching the switch set on the temple 3. When the processor receives the fatigue adjustment training instruction, it can control the optical power of the adjustable area to change according to the preset range and / or speed. In specific implementation, it can adopt a training mode of step-by-step binocular zooming from small to large, for example, wherein the optical power of the adjustable area of ​​the first lens layer 2a can be gradually zoomed from ±0.5D, ±1.0D, ±1.5D, ±2.0D to ±2.5D, and then reduced to ±0.5D step by step. Wherein, each step completes 1 minute of training and enters the next step. In addition, the training speed can be but not limited to the traditional reverse shooting speed (for example, 8 cycles of positive and negative optical power reversal per minute). In this embodiment, the step-by-step progressive zooming method can take into account the use needs of users with different training amplitudes, and its scope of application is more extensive.

[0216] Step 4: The processor has obtained the amount of light added or the optical focal length of the reverse beat training of the first lens layer 2a according to the different functional states. It can be understood that in the present application, the amount of light added and the optical focal length of the reverse beat training both correspond to the optical focal length of the adjustable area (e.g., the lower light area) of the first lens layer 2a. At this time, the processor can retrieve the optical focal length and voltage difference relationship table in the memory, wherein Table 2 shows the optical focal length and voltage difference relationship table provided by an embodiment of the present application. The processor retrieves the voltage difference corresponding to the optical focal length of the above-mentioned adjustable area according to the optical focal length and voltage difference relationship table, and transmits it to the voltage conversion unit corresponding to the adjustable area of ​​the first lens layer 2a to output the corresponding voltage difference, so that the adjustable area forms the corresponding optical focal length. The voltage conversion unit can be a driving device based on various voltage conversion technologies, including but not limited to an adjustable resistance voltage generator, pulse width modulation, etc.

[0217] Table 2

[0218] The optical power of the lower optical zone of the first lens layer Voltage difference *** *** *** *** *** *** *** ***

[0219] In the present application, in addition to being able to satisfy the requirements of the optical focal length at different viewing distances of the human eye and to perform fatigue relief training for reverse shooting by setting the first lens layer 2a as the above-mentioned liquid crystal lens, in some possible embodiments of the present application, the first lens layer 2a can also be set as a liquid lens layer. Fig.17 , Fig.17 This is a schematic diagram of the structure of a lens 2 provided in another embodiment of the present application. In this embodiment, the first lens layer 2a may also include a first substrate 201a and a second substrate 201b, a liquid storage chamber is formed between the first substrate 201a and the second substrate 201b, and at least one of the first substrate 201a and the second substrate 201b may be an elastic film substrate. Different from the above-mentioned liquid crystal lens layer, in the liquid lens layer, the liquid storage chamber of the first substrate 201a and the second substrate 201b contains an optical liquid 205. In addition, the total volume of the optical liquid 205 in the liquid storage chamber can be changed as needed. In specific implementation, it can be as follows: Figure 2 The temple 3 of the glasses shown in the figure is provided with a driving device (e.g., a micro-stepping motor) 4, a liquid storage structure (not shown in the figure) and a battery 5. In this way, the total amount of the optical liquid 205 in the liquid storage chamber of the first lens layer 2a can be controlled by the driving device 4. For example, when the optical liquid 205 in the liquid storage structure is injected into the liquid storage chamber of the first lens layer 2a, the first substrate 201a and / or the second substrate 201b of the first lens layer 2a are convex under the squeezing action of the optical liquid 205, so that the first lens layer 2a forms a positive lens effect. On the contrary, when the optical liquid 205 in the liquid storage chamber is drawn out, the first substrate 201a and / or the second substrate 201b of the first lens layer 2a are concave, so that the first lens layer 2a forms a negative lens effect. Therefore, in this embodiment, the amount of optical liquid 205 in and out of the liquid storage chamber can determine the radius of curvature of the first lens layer 2a, thereby determining the amount of light addition of the lens 2 or the amplitude of the reverse beat training.

[0220] In this embodiment, the entire lens 2 may include a first lens layer 2a and a second lens layer 2b, wherein the second lens layer 2b is still the solid concave lens mentioned above. The second lens layer 2b can be used to achieve the function of correcting myopia and astigmatism of human eyes, and the first lens layer 2a is used to achieve the function of adding light under near vision and reverse shooting training.

[0221] In a possible embodiment, by performing optical simulation on a liquid lens layer with an aperture of 35 mm, deformation conditions under different optical powers can be obtained. For example, reference can be made to Figures 18a to 18d ,in, Fig.18a The focal length of the first lens layer 2a is -6D. Fig.18b The focal length of the first lens layer 2a is -4D. Fig.18cThe focal length of the first lens layer 2a is -2D. Fig.18d The focal length of the first lens layer 2a is +3D. According to the simulation, it can be obtained that in the above Figures 18a to 18d In the simulation, the sagittal height data of the first lens layer 2a are -2.402mm, -1.573mm, -0.786mm and 1.304mm respectively, and the deformation of its surface change is 1.304+2.402=3.706mm. It can be seen from the simulation that the first lens layer 2a can achieve a zoom range of -6D to +3D with a large aperture and a thin thickness, which can meet the needs of daily reading and reverse shooting zoom training.

[0222] In addition, for some users, in addition to the above-mentioned requirements for myopia correction, presbyopia correction and myopia prevention and control, they may also have the problem of astigmatism. Fig.19 , Fig.19 A schematic diagram of human eye astigmatism provided by an embodiment of the present application is shown. In the case of regular astigmatism, it can be corrected by frame glasses. Regular astigmatism is caused by the different curvatures of the two main meridians of the cornea 8 or the lens 9. The two main meridians are perpendicular to each other. Parallel light rays cannot converge to a focus through the eye of regular astigmatism, for example Fig.19 Points A and B in the figure. For the focus that converges in front of and behind the retina, it is impossible to form a clear image on the retina, and a blurred image is formed. Converging in front of the retina is myopic astigmatism, which is corrected with a concave cylindrical lens. Converging behind the retina is hyperopic astigmatism, which is corrected with a convex cylindrical lens.

[0223] In order to correct human eye astigmatism, in a possible embodiment of the present application, referring to Fig. 20 , Fig. 20 This is a schematic diagram of the structure of a lens provided in another possible embodiment of the present application. In this embodiment, the lens 2 may also include a second lens layer 2b, which is stacked with the first lens layer 2a. In this embodiment, the first lens layer 2a may be arranged according to the above Fig.12 The spherical liquid crystal lens described in the embodiment shown is arranged, and no further description is given here. In addition, different from the above embodiment, in this embodiment, the second lens layer 2b is a cylindrical liquid crystal lens layer with Fresnel design. Fig.21 , Fig.21 A schematic diagram of the structure of a conventional cylindrical liquid crystal lens of Fresnel type design provided in the present application. A cylindrical liquid crystal lens refers to a lens that is divided into multiple strip-shaped Fresnel lobes 206 by transparent electrodes in the direction from the central area to the peripheral area, and a strip-shaped Fresnel lobe-shaped refractive index distribution is formed between two adjacent transparent electrodes, so that the entire lens constitutes a cylindrical liquid crystal lens with a larger aperture.

[0224] Similar to the introduction of the traditional spherical liquid crystal lens in the above embodiment, the large-sized cylindrical liquid crystal lens designed according to traditional geometric optics has a very small range of optical power variation, and thus cannot be used for astigmatism correction.

[0225] In addition, refer to Fig. 22 In the present application, in order to improve the imaging quality of the cylindrical liquid crystal lens, the second lens layer 2b provided by the present application can also be further divided into a plurality of narrow strip-shaped Fresnel lobes 206 by using a Fresnel design on the basis of the above-mentioned conventional cylindrical liquid crystal lens to form strip-shaped sub-Fresnel lobes 2061. Since the electrode spacing of each strip-shaped sub-Fresnel lobe 2061 is reduced after the division, the second lens layer 2b can form a parabola-like electric field distribution curve as a whole, and compared with the above-mentioned conventional cylindrical liquid crystal lens, its imaging quality is significantly improved.

[0226] In regular astigmatism, the two main diameters of the cornea or lens are perpendicular to each other, but they are not one horizontal and one vertical, but at different angles. This is the different axis positions of human eye astigmatism. For traditional glasses with astigmatism axis correction, the axis position of the human eye is set when the glasses are fitted. In addition, during the use of the glasses, the axis position of the lens of the glasses cannot change with the change of the axis position of the human eye astigmatism. As the axis position of the human eye astigmatism changes, the glasses will not be able to meet the user's wearing requirements.

[0227] Based on this, in some embodiments of the present application, when the lens including the spherical liquid crystal lens layer and the cylindrical liquid crystal lens layer is applied to glasses, refer to Fig.23 , Fig.23 The schematic diagram of the structure of glasses in one embodiment of the present application is shown. In this embodiment, a first power supply contact 102 is provided on the frame 1 of the glasses, and a second power supply contact 201 is provided on the second lens layer 2b. Fig.23 In the figure, for the convenience of explanation, one side frame 1 of the glasses is used to show the arrangement of the first power supply contact 102 on the frame, and the second lens layer 2b arranged on the other side frame 1 of the glasses is used to show the arrangement of the second power supply contact 207.

[0228] You can continue to refer to Fig.23In the present application, the second power supply contact 207 can be made into an annular contact, and the first power supply contact 102 and the second power supply contact 207 are always in a state of conductive contact. In this way, a ring track power supply structure is formed between the second lens layer 2b and the frame 1. This structural form facilitates the relative rotation of the second lens layer 2b and the frame 1, so that the axis position of the lens can be adjusted by rotating the second lens layer 2b relative to the frame 1, so as to correct the axis position of astigmatism. In addition, it can be understood that in order to facilitate the relative rotation of the second lens layer 2b and the frame 1, the second lens layer 2b can be set to a circular structure.

[0229] It is worth mentioning that, with the lens provided in this embodiment of the present application, as the degree of astigmatism of the human eye develops, the degree of astigmatism of the lens can be adjusted by changing the voltage applied to the second lens layer 2b to meet the wearing requirements of the user.

[0230] With the lens provided in this embodiment of the present application, the first lens layer 2a can be used for myopia correction, and can realize the function of eye fatigue reverse shooting training by adding light in the adjustable area (such as the lower light area) and / or by reversing the positive and negative focal lengths. The second lens layer 2b can be used to adjust the astigmatism and the astigmatism axis. Therefore, the lens has the advantages of flexible adjustment of myopia degree, astigmatism degree and astigmatism axis to meet the different eye requirements of users.

[0231] In addition, when the lens is used for glasses as an entertainment carrier, such as AR or VR glasses, when it is used in a scene where multiple people wear it, the astigmatism axis and astigmatism degree of the lens can be adjusted by rotating the second lens layer 2b, so as to meet the astigmatism correction requirements of different users and meet the wearing needs of AR or VR glasses for people with astigmatism.

[0232] When the lens formed by the composite of the first lens layer 2a and the second lens layer 2b mentioned above in this application is used in zoom glasses, the amount of light added in the adjustable area can be adjusted according to the eye distance to meet the requirements for optical focal length at different eye distances; and the state of eye fatigue can be monitored to provide corresponding reverse shot fatigue relief training; in addition, the adjustment of the astigmatism degree and the astigmatism axis can also be achieved. In this embodiment, the application of smart zoom glasses in presbyopia correction can be used as an example to illustrate it. From the introduction of the above embodiments, it can be known that the near vision light addition and eye fatigue adjustment training functions of the lens provided by this application, for people with presbyopia, light addition is not used for myopia prevention and control, but to make up for the lack of eye adjustment ability.

[0233] In the specific implementation, the first step is to obtain the distance of human vision and the state of eye fatigue through intelligent perception, and establish a wireless connection path through the application software set by the external terminal to achieve the setting of myopia, astigmatism and accommodation of the glasses. The set parameters can be obtained through optometry and stored in the memory of the glasses provided by this application.

[0234] It is worth mentioning that in this embodiment of the present application, the device and method for obtaining the viewing distance and eye fatigue status of the human eye can refer to the above embodiments and will not be repeated here.

[0235] In the second step, the processor reads the optometry parameters (myopia, astigmatism and accommodation) from the memory, and calculates the required light addition amount based on the accommodation stimulus (the inverse of the viewing distance) and the accommodation power, and superimposes the myopia to form the required optical power of the lens. The calculation process is shown in the following formula.

[0236]

[0237] For myopia of -3D (-300 degrees) and accommodation power of 0.5D, the optical power of the lens under accommodation stimulation at different viewing distances can be seen in Table 3.

[0238] Table 3

[0239] Eye distance (m) Modulation stimulus (D) Adjustment force (D) Myopia degree (D) Lens power (D) 0.5 2 0.5 -3 -1.25 0.4 2.5 0.5 -3 -0.75 0.33 3 0.5 -3 -0.25 0.25 4 0.5 -3 0.75 0.2 5 0.5 -3 1.75

[0240] In this embodiment of the present application, the astigmatism axis position can be obtained by optometry, wherein the second lens layer 2b can be adjusted and fixed in a suitable position by manually rotating the second lens layer 2b according to the astigmatism axis position obtained by optometry. In addition, in this embodiment, the astigmatism degree can be read from the memory, and the optical power of the second lens layer 2b is:

[0241]

[0242] Step 3: The processor sends a fatigue warning signal to the user based on the human eye fatigue state measured by the fatigue state measurement sensor. The user can set the reverse beat training speed and amplitude through the external terminal device and send it to the glasses processor via wireless signal transmission. The processor can start the adjustment training based on the reverse beat training speed and amplitude command it receives.

[0243] In a possible embodiment of the present application, the user can start the adjustment training by touching the switch set on the temple 3, which can adopt a training mode of step-by-step binocular zooming from small to large, wherein the optical focal length of the adjustable area of ​​the first lens layer 2a can be gradually zoomed from ±0.5D, ±1.0D, ±1.5D, ±2.0D to ±2.5D, and then reduced to ±0.5D step by step. Wherein, each step enters the next step after completing 1 minute of training. In addition, the training speed can be but not limited to the traditional reverse shooting speed (for example, 8 cycles of positive and negative optical focal length reversal per minute). In this embodiment, the step-by-step progressive zooming method can take into account the user's use needs of different training amplitudes, and its scope of application is more extensive.

[0244] Step 4: The processor has obtained the optical power corresponding to the light addition amount, reverse beat training and astigmatism degree according to the different functional states. It can be understood that in the present application, the optical power of the light addition amount and reverse beat training corresponds to the optical power of the lower light zone of the first lens layer 2a, and the astigmatism degree corresponds to the optical power of the second lens layer 2b. At this time, the processor can retrieve the voltage difference corresponding to each of the above optical powers according to the optical power and voltage difference relationship table, and apply the corresponding voltage difference to the first lens layer 2a and the second lens 2b respectively.

[0245] In another possible embodiment of the present application, the second lens layer 2b of the lens is a liquid crystal lens layer, and the second lens layer 2b has multiple liquid crystal regions. When the lens is used in glasses, the glasses may also include a light source and a gaze angle sensor, and the light source and the gaze angle sensor may be arranged on the frame of the glasses. In the present application, the gaze angle measurement sensor may be made based on, but not limited to, the principle of eye tracking technology such as electro-ocular 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 second lens layer 2b may be obtained by recording the positioning and movement of the eye.

[0246] Taking the pupil 10-cornea 8 reflection method as an example, you can refer to Fig.24 , Fig.24 Schematic diagram of the center of pupil 10-the center of bright spot 801 vector. A light source 12 (e.g., an infrared light source 12) disposed on the frame of the glasses is used to emit a light beam to the eyeball, and the light beam generates a bright spot 801 on the surface of the cornea 87. Then, the camera 11 is used to obtain an eye image, thereby obtaining the center coordinates of pupil 10 and the center of bright spot 801, that is, the center vector of pupil 10-the center of bright spot 801. This vector changes with the direction of the pupil 10 line of sight. Fig.24As shown, multiple light sources 12 can form bright spots 801 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 10. On this basis, with the help of environmental calibration coordinate data, the position of the gaze point 208 of the line of sight on the plane coordinate system of the second lens layer 2b can be calculated.

[0247] In the actual application system, the environmental calibration coordinate data is known, including the distance between the second lens layer 2b and the human eye, the inclination angle of the second lens layer 2b relative to the surface of the human eye, and the position of the center of each bright spot 801, so that the coordinates of the center of the pupil 10 and the coordinates of the gaze point 208 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 208 to identify the position of the first optical zone, wherein the first optical zone refers to the area where the gaze point 208 of the human eye on the second lens layer 2b 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 208. Therefore, the center of the pupil 10 can be taken as a discrete value and corrected in advance to form a data retrieval table. Referring to Table 4, Table 4 is a data retrieval table for the mapping relationship between the center of the pupil 10 and the gaze point 208 provided in an embodiment of the present application. The data retrieval table can be stored in the memory, so that after the camera 11 obtains the center coordinate data of the pupil 10, the processor can retrieve the data retrieval table to obtain the coordinates of the closest gaze point 208 on the second lens layer 2b, thereby completing the measurement of the gaze angle.

[0248] Table 4

[0249] Pupil center coordinate x Pupil center coordinate y The coordinate x of the gaze point in the lens The y coordinate of the gaze point in the lens *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

[0250] Since in actual applications, the position and shape of each liquid crystal region in the second lens layer 2b are known, and the coordinate range of the points it contains is also determined, these parameters are preset when the second lens layer 2b is formed, refer to Table 5, which is a retrieval table for the position and shape information of each liquid crystal region of the second lens layer 2b provided in an embodiment of the present application. The retrieval table can be stored in a memory.

[0251] Table 5

[0252] LCD area number Liquid crystal area center coordinate x Liquid crystal area center coordinate y The radius of the liquid crystal region r *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

[0253] Simplifying the shape of the liquid crystal region as a circle, and knowing that its center coordinates are (a, b), the distance from each point on the circle to the center is equal to the radius r of the circle, so:

[0254]

[0255] The distance from each point in the circle to the center is less than the radius of the circle:

[0256]

[0257] On this basis, the coordinates of each gaze point 208 measured by the measuring sensor on the second lens layer 2b can be compared with the distance between the center of each liquid crystal area in turn. If it is less than or equal to the radius of the circle, the number of the liquid crystal area where the coordinate of the gaze point 208 is located can be identified, and these liquid crystal areas that meet the above conditions are identified as being in the first optical zone, and the other liquid crystal areas 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.

[0258] In addition, the processor can adjust the optical focal length of the liquid crystal area included in the first optical zone to the user's myopia degree to ensure the user's clear distance vision, and add positive optical focal length to the liquid crystal area included in the second optical zone based on the user's myopia degree to form a myopic defocus and myopia prevention and control effect.

[0259] When the second lens layer 2b is used for a lens, the lens adjustment method may further include the following steps:

[0260] Step 4, setting the focal power of the first optical zone and the second optical zone of the second lens layer 2b of the lens. 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 second lens layer 2b of the lens 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.

[0261] In another possible embodiment of the present application, an intelligent sensing module can be provided on the glasses to obtain the displacement between the retinal imaging point and the ideal imaging through the intelligent sensing module, and convert it into myopia degree and defocus degree, 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.

[0262] Step 5, determine the position of the gaze point 208 on the second lens layer 2b through the gaze point measurement sensor. Since the gaze point 208 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 208 on the second lens layer 2b, and the second optical zone is located at the periphery of the first optical zone. In addition, when the positions of the first optical zone and the second optical zone are determined, the number of the liquid crystal area included in the first optical zone and the number of the liquid crystal area included in the second optical zone can be determined. Among them, the optical focal length of the liquid crystal area located in the optical central area can correspond to the myopia degree. In addition, the optical focal length of the liquid crystal area located in the peripheral area is superimposed with the defocus degree on the basis of the corresponding myopia degree, and the peripheral area is used as the defocus area.

[0263] 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 208, and the position of the defocused area will also change adaptively with the change of the position of the gaze point 208, 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 provided by the present application can be used to dynamically adjust the position of the defocused area of ​​the second lens layer 2b of the lens to achieve the movement and adjustment of the central area of ​​the entire lens, thereby meeting the personalized needs of different positions of the optical central area of ​​the lens caused by the diverse pupil distances of users.

[0264] In addition, in the present application, since there may be gaps between the various liquid crystal regions of the second lens layer 2b, 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 second lens layer 2b of the lens can also be gradually changed from the central area to the peripheral area. In specific implementation, with the focus point 208 at the coordinates (a, b) of the lens as the center, the defocus degree of the liquid crystal region farthest from the focus point 208 is the largest, and the distance between each liquid crystal region on the lens and the focus point 208 can be calculated. Still taking the first optical zone as an example with a radius of 9 mm, the optical focal length of the liquid crystal region farthest from the first optical zone is the defocus degree, then the center coordinates (x, y) of the liquid crystal region located in the first optical zone is at a distance from the focus point 208 that satisfies:

[0265]

[0266] The liquid crystal region that meets this condition is identified as being in the first optical zone, and its optical power corresponds to the degree of myopia.

[0267] In this way, the distance R between the farthest liquid crystal area and the gaze point 208 is traversed. max , the focal length of the farthest liquid crystal area is the defocus degree D, then the focal length of each liquid crystal area in the optical peripheral area is The distance from the gaze point 208 may increase linearly and gradually, then:

[0268]

[0269] By gradually increasing the defocus degree of the second lens layer 2b of the lens 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 second lens layer 2b of the lens can be reduced, thereby improving the comfort of user use.

[0270] It can be understood that in the present application, the defocus degree of the second lens layer 2b 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 second lens layer 2b 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 length 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.

[0271] In step six, 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 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, so that the voltage conversion unit outputs a voltage signal of the corresponding frequency, so that the liquid crystal areas located in the first optical zone and the second optical zone form a preset optical focal length.

[0272] In this embodiment of the present application, the first lens layer 2a is used to provide a basic optical power corresponding to the user's myopia degree to achieve a vision correction effect. The second lens layer 2b provides a positional movement of the first optical zone and the second optical zone, as well as an adjustment function for the defocus degree. 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 superimposing the optical power of the second optical zone and the optical power of the first lens layer.

[0273] It can be understood that in some other possible embodiments of the present application, the second lens layer 2b can also be set as a liquid lens layer, so that the first lens layer 2a is used to realize the functions of adding light under near vision and reverse shooting training, and the second lens layer 2b can be used to realize the functions of correcting the degree of myopia and astigmatism of the human eye. Among them, the specific configuration of the first lens layer 2a can refer to the above embodiment, and will not be repeated here.

[0274] 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.

[0275] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products 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 processes and / or boxes 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 generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0276] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0277] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0278] 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 adjustment method, characterized in that: The lens includes a first lens layer, the first lens layer includes an adjustable region, and the method 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; A relationship function of a univariate multi-time polynomial is obtained by fitting according to a plurality of different viewing distances of the human eye, and the relationship function of the univariate multi-time polynomial is used to predict the amount of light added under myopia at different viewing distances of the human eye; The optical power of the adjustable area is determined according to the normal correction degree and the amount of light added under myopia.

2. The method according to claim 1, characterized in that The relationship function of a univariate multi-order polynomial obtained by fitting according to a plurality of different human eye viewing distances includes: The relationship function of the univariate multi-time polynomial is obtained by fitting a plurality of human eye adjustment stimuli, wherein the human eye adjustment stimulus is the inverse of the viewing distance of the human eye.

3. The method according to claim 1 or 2, characterized in that The method further includes: obtaining the relationship function of the univariate multi-order polynomial 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.

4. The method according to claim 1 or 2, characterized in that: The adjustable area is located in the lower light area of ​​the first lens layer.

5. The method according to claim 1 or 2, characterized in that: The method further comprises: Obtaining fatigue state parameters of human eyes; When the fatigue state parameter exceeds a preset threshold, the optical power of the adjustable area is controlled to change within a preset range and / or speed.

6. The method according to claim 5, characterized in that When the fatigue state parameter exceeds a preset threshold, controlling the optical power of the adjustable area to change according to a preset range and / or speed includes: When the fatigue state parameter exceeds a preset threshold, a fatigue warning signal is issued; Get user instructions; When the user instruction indicates to start fatigue adjustment training, the optical power of the adjustable area is controlled to change according to a preset range and / or speed.

7. The method according to claim 1 or 2, characterized in that: The lens further includes a second lens layer, the first lens layer and the second lens layer are stacked; the second lens layer is a liquid crystal lens layer, and the second lens layer includes a plurality of liquid crystal regions, and the method further includes: Obtaining the position of the gaze point of the human eye on the second lens layer; Determining the positions of the first optical zone and the second optical zone according to the position of the gaze point on the second 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; 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, wherein the first optical focal length and the second optical focal length are different.

8. The method according to claim 7, 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.

9. The method according to claim 7, characterized in that The method further comprises: Obtaining target defocus degree and target diopter; determining the optical power of the first optical zone according to the target diopter; The optical power of the second optical zone is determined according to the target defocus power.

10. The method according to claim 7, characterized in that The lens is used for glasses, and the glasses further include a light source. The step of obtaining the position of the gaze point of a human eye on the second lens layer 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 lens is determined according to the relative position between the pupil center and the bright spot.

11. A control device for lens adjustment, characterized in that: The device comprises: An acquisition module, used for acquiring a human eye viewing distance, where the human eye viewing distance is the distance between the human eye and a target object that the human eye is gazing at; A determination module, used for fitting a univariate multi-time polynomial relationship function according to a plurality of different human eye viewing distances, wherein the univariate multi-time polynomial relationship function is used for predicting the amount of light added under myopia at different human eye viewing distances; The determination module is also used to determine the optical focal length of the adjustable area according to the normal correction degree and the amount of light added under myopia, and the adjustable area is located in the first lens layer of the lens.

12. The device according to claim 11, characterized in that The determination module is further used to obtain a relationship function of a univariate multi-time polynomial according to the human eye adjustment stimulus, and the human eye adjustment stimulus is the reciprocal of the human eye viewing distance.

13. The device according to claim 11 or 12, characterized in that The relationship function of the univariate multi-time polynomial is obtained by fitting multiple sets of discrete data, and the discrete data includes the corresponding relationship between the viewing distance of the human eye and the optical focal length.

14. The device according to claim 11 or 12, characterized in that The adjustable area is located in the lower light area of ​​the first lens layer.

15. The device according to claim 11 or 12, characterized in that: The acquisition module is also used to acquire the fatigue state parameter of the human eye; The device further comprises a control module, which is used for controlling the optical power of the adjustable area to change within a preset range and / or speed when the fatigue state parameter exceeds a preset threshold.

16. The device according to claim 11 or 12, characterized in that The lens further includes a second lens layer, wherein the first lens layer and the second lens layer are stacked; the second lens layer is a liquid crystal lens layer, and the second lens layer includes a plurality of liquid crystal regions, wherein: The acquisition module is further used to acquire the position of the gaze point of the human eye on the second lens layer; The determination module is further used to determine the positions of the first optical zone and the second optical zone according to the position of the gaze point on the second lens layer, 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; The determination module is further used to determine 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; The device also includes a control module, which is used to control the liquid crystal area in the first optical zone to form a first optical focal length, and control the liquid crystal area 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.

17. The device according to claim 16, characterized in that The controlling the liquid crystal region in the second optical zone to form a second optical power comprises: The control module is specifically used to control the formation of a plurality of second optical focal lengths that increase sequentially in the second optical zone in the direction from the first optical zone to the second optical zone, wherein each second optical focal length is formed by one or more liquid crystal regions.

18. A control device, characterized in that: The method comprises a processor and a memory; the memory stores program codes, and when the program codes are executed by the processor, the method according to any one of claims 1 to 10 is implemented.

19. A pair of glasses, characterized in that: The glasses comprise a control device as claimed in claim 18.

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

21. The glasses according to claim 19 or 20, characterized in that: The glasses include a lens, a frame and temples, wherein the lens is connected to the frame and the temples.

22. The glasses according to claim 21, characterized in that The lens further includes a third lens layer, which is a liquid crystal lens; in a direction from the central area to the peripheral area, the third lens layer includes a plurality of strip-shaped Fresnel lobes; The lens frame is provided with a first power supply contact, and the third lens layer is provided with a second power supply contact, and the second power supply contact is provided in a ring structure; the third lens layer can rotate along the lens frame, and the first power supply contact and the second power supply contact are in conductive contact.

23. The glasses according to claim 21, 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.

Images