Composite defocus lens

Abstract

The invention belongs to the technical field of medical instruments, and discloses a composite defocus lens which comprises a defocus lens, a liquid lens, a support and a controller. The out-of-focus lens and the liquid lens are coaxially erected on the support. The support is arranged to enable the out-of-focus lens and the liquid lens to be located in front of the eyes of the wearer. The liquid lens is set to have at least one diopter, and light rays entering or exiting from the out-of-focus lens are adjusted. The controller is connected with the liquid lens and used for adjusting the diopter of the liquid lens. By changing the peripheral myopia out-of-focus distance, the myopia out-of-focus tolerance of a wearer can be overcome. The diopter of the liquid lens is controlled through the variable quantity of the visual object distance, and the hyperopia defocusing amount caused by switching of far and near objects and hysteresis adjustment can be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and more specifically, the present invention relates to a composite defocusing mirror. Background Art

[0002] Myopia refers to the blurred vision caused by parallel light rays that focus in front of the retina after passing through the eye's refractive system. Myopia is manifested by the inability of parallel light rays to form an image on the retina after entering the eye, and the eye structure manifests itself in the axial length exceeding the normal range or the excessive curvature of the cornea or lens.

[0003] The main theories of the occurrence and development of myopia include the accommodation lag theory and the peripheral defocus theory. The accommodation lag theory believes that after long-term near vision, accommodation lag makes the eyes unable to focus accurately, and the focus of the object falls behind the retina to form hyperopic defocus, thus causing myopia. The peripheral defocus theory believes that peripheral retinal hyperopic defocus may be an important factor in the progression of myopia.

[0004] Defocusing glasses are glasses that correct refractive errors and interfere with vision development through special optical design. They adjust the focusing path of light to allow the retina to obtain clear images, while combining peripheral vision regulation mechanisms (such as inhibiting or promoting retinal development). Defocusing glasses allow central light to be imaged on the retina and peripheral light to be imaged in front of the retina. The retina will move forward as much as possible, so that the eye axis does not lengthen or lengthens as little as possible, while keeping the visual function as normal as possible, thereby controlling the growth of myopia.

[0005] Existing defocusing glasses usually have a fixed fitting distance, and thus have a fixed refractive correction interval. When the object is located near the fitting distance, the refractive correction interval of the defocusing glasses meets the need to eliminate hyperopic defocus. When the object that the wearer first views is located far greater than the fitting distance, and the object that the wearer views later is located close to the fitting distance or less than the fitting distance, temporary hyperopic defocus will occur, and the refractive correction interval of the defocusing glasses will not be able to eliminate the hyperopic defocus. That is, when the user switches between far and near objects, the refractive correction interval inherent in the defocusing glasses is exceeded, resulting in hyperopic defocus caused by hysteresis adjustment. Moreover, the myopic defocus distance caused by the refractive correction of existing defocusing glasses is fixed, and users will develop adaptive tolerance after long-term use, resulting in failure of defocus adjustment.

[0006] In view of this, there is an urgent need for a technical solution to improve the existing defocus glasses to solve the problems of hyperopic defocus and myopic defocus tolerance caused by hysteresis adjustment when switching between far and near vision. Summary of the invention

[0007] In order to at least solve one or more of the technical problems mentioned above, the present invention provides a composite defocus lens including: a defocus lens, a liquid lens, a bracket and a controller; the defocus lens and the liquid lens are coaxially mounted on the bracket; the bracket is configured to make the defocus lens and the liquid lens located in front of the wearer's eyes; the liquid lens is configured to: have at least one refractive power to adjust the light incident to or emitted from the defocus lens; the controller is connected to the liquid lens for adjusting the refractive power of the liquid lens.

[0008] According to one embodiment of the present invention, the controller is configured to adjust the diopter of the liquid lens to change periodically within a preset interval, so that the peripheral myopia defocus distance of the wearer changes periodically accordingly.

[0009] According to one embodiment of the present invention, the controller is configured to adjust the refractive power of the liquid lens to randomly change within a preset interval, so that the wearer's peripheral myopia defocus distance changes randomly accordingly.

[0010] According to one embodiment of the present invention, the controller is configured to control the refractive power of the liquid lens to switch from a first refractive power to a second refractive power according to a change in the viewing distance when the viewing distance of the wearer of the composite defocusing lens switches from far to near.

[0011] According to one embodiment of the present invention, the first refractive power is set so that the liquid lens converges light and reduces the wearer's hyperopic defocus; the second refractive power is 0 or is within a preset range; the absolute value of the first refractive power is greater than the absolute value of the second refractive power.

[0012] According to one embodiment of the present invention, the composite defocusing lens also includes a distance sensor connected to the controller, the distance sensor is oriented in the direction of the wearer's line of sight, and is used to provide the wearer's viewing distance; the controller adjusts the refractive power of the liquid lens based on the change in the wearer's viewing distance.

[0013] According to one embodiment of the present invention, the liquid lens includes any one of a liquid crystal type, an electrowetting type, and a liquid-filled type.

[0014] According to one embodiment of the present invention, when the liquid lens is of liquid crystal type or electrowetting type, the electrode of the liquid lens is a metal thin film transparent electrode.

[0015] According to one embodiment of the present invention, the controller includes a timing module, and the timing module is used to control the activation time of the liquid lens.

[0016] According to one embodiment of the present invention, the controller further comprises a display module, and the display module is used to display the state parameters of the liquid lens.

[0017] According to one embodiment of the present invention, the controller is a microprocessor, and one or more control modes are built into the microprocessor or input by the user. The microprocessor outputs control signals to the liquid lens according to different control modes to control the switching of the diopter of the liquid lens.

[0018] According to one embodiment of the present invention, the composite defocusing mirror also includes an eye tracker and a distance sensor connected to the controller, the eye tracker is used to provide eye tracking information of the user; the distance sensor is used to provide the distance of the object in the direction of the user's line of sight; the controller adjusts the refractive power of the liquid lens based on the change in the distance of the object in the direction of the user's line of sight.

[0019] According to one embodiment of the present invention, the controller further includes a voice module, and the voice module is used to broadcast the state parameters of the liquid lens.

[0020] In the present invention, a liquid lens is used to adjust the light incident on or emitted from the defocus lens, thereby changing the peripheral myopia defocus distance, and the wearer's myopia defocus tolerance can be overcome. By setting a periodic change or a random change within a preset interval, the change of the peripheral myopia defocus distance is regular or random, and the wearer's myopia defocus tolerance is further overcome. By controlling the refractive power of the liquid lens by the change in the viewing distance, the hyperopia defocus amount caused by the switching of near and far viewing and the hysteresis adjustment can be reduced. By setting a distance sensor to provide the wearer's viewing distance, the change in the viewing distance can be obtained in real time. By setting the electrode of the liquid lens to a metal film transparent electrode, the light blocking phenomenon caused by the electrode can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0022] Figure 1 A schematic diagram showing long-distance vision through a defocused lens is shown;

[0023] Figure 2 A schematic diagram showing the moment of switching from long-distance vision to close-up vision through a defocusing lens;

[0024] Figure 3 A schematic diagram showing close-up vision through a defocused lens is shown;

[0025] Figure 4 A schematic diagram of a composite defocusing mirror is shown;

[0026] Figure 5 A schematic diagram showing a liquid lens adjusting light incident on a defocused lens;

[0027] Figure 6 A schematic diagram showing the liquid lens instantly adjusting the light incident on the defocused lens when switching from long-distance vision to close-up vision;

[0028] Figure 7 A schematic diagram showing a liquid lens adjusting light incident on a defocused lens after a period of time when switching from long-distance vision to close-up vision. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0030] It should be understood that the terms "include" and "comprising" used in the description and claims of the present invention indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0031] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the claims, the singular forms of "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be further understood that the term "and / or" used in the specification of the present invention and the claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0032] As used in this specification and claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0033] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] Figure 1 A schematic diagram showing distance vision through a defocusing lens.

[0035] Figure 2 A schematic diagram showing the moment of switching from long-distance vision to close-up vision through a defocusing lens.

[0036] Figure 3 A schematic diagram showing close viewing through a defocusing lens.

[0037] Defocus lenses usually have a fixed design object distance range. The design object distance range refers to the standard object distance range during fitting, usually 1.5m to 5m. When the user looks at objects within this viewing distance range, peripheral refractive correction can maintain myopic defocus. However, when the object being observed switches from a position outside the object distance range to within the object distance range, it is easy to cause temporary hyperopic defocus in the central or peripheral areas of the retina.

[0038] Figures 1 to 3 It is the process of eyes switching from long-distance vision to close-up vision.

[0039] like Figure 1 As shown, when the eye is observing a distant object A, light is transmitted to the lens 20 through the defocusing lens 10, forming emmetropia in the fovea area of ​​the retina 30, and forming myopic defocus in the peripheral area of ​​the retina 30. The dotted line L1 is the imaging focal plane.

[0040] like Figure 2 As shown, when the eye switches from long-distance viewing to close-up viewing, and observes close-up object B, light is transmitted to the lens 20 through the defocusing lens 10. The lens 20 should expand its convexity under the adjustment of the ciliary muscle of the eye. The adjustment action includes contracting the smooth muscle, relaxing the suspensory ligament, etc. However, due to the hysteresis of the adjustment, the thickness of the lens is difficult to adjust to the ideal state at the moment of switching the viewing distance, thereby forming a temporary hyperopic defocus in the fovea area of ​​the retina 30, and forming a local temporary hyperopic defocus in the peripheral area of ​​the retina 30. Among them, the dotted line L2 is the imaging focal plane.

[0041] like Figure 3 As shown, after a period of time when the eyes switch from long-distance viewing to close-up viewing, when observing a close-up object B, the light is transmitted to the lens 20 through the defocusing lens 10. During this "period of time", the lens 20 expands its convexity to an associative state under the adjustment of the ciliary muscle of the glasses, and forms an emmetropia image in the retinal macula in the fovea area of ​​the retina 30 again, and forms myopic defocus again in the peripheral area of ​​the retina 30. Among them, the dotted line L3 is the imaging focal plane.

[0042] In addition, the central and peripheral refractive powers of the defocus lens are fixed. Without considering the hysteresis adjustment of the lens, the position of the peripheral myopic defocus surface formed is fixed. Long-term use will cause the wearer to tolerate myopic defocus.

[0043] Figure 4 A schematic diagram of a compound defocusing mirror is shown.

[0044] like Figure 4 As shown, a composite defocus lens comprises: a defocus lens 10, a liquid lens 40, a bracket 50 and a controller 60; the defocus lens 10 and the liquid lens 40 are coaxially mounted on the bracket 50; the bracket 50 is configured to make the defocus lens 10 and the liquid lens 40 located in front of the wearer's eyes; the liquid lens 40 is configured to: have at least one diopter to adjust the light incident to or emitted from the defocus lens 10; the controller 60 is connected to the liquid lens 40 for adjusting the diopter of the liquid lens 40.

[0045] The bracket 50 is used to support the liquid lens 40 and the defocused lens 10, and is placed in front of the wearer's eyes and aligned with the visual center of the eyes. The bracket 50 can be a head-mounted structure, or a table structure that can be placed on a table to fix the position between the liquid lens 40 and the defocused lens 10.

[0046] Liquid lens is an optical device made by using one or more liquids. The surface curvature radius can be changed by external control, or the refractive index of the filling liquid can be changed to achieve the purpose of changing the refractive power. It has a zoom capability that traditional optical lenses cannot match, and has the advantages of high adjustment accuracy, small size, and fast response speed.

[0047] Liquid lenses are either single-liquid or dual-liquid. Dual-liquid lenses are mostly designed using the principle of electrowetting on a medium, while single-liquid liquid lenses are mostly designed by changing the volume of liquid in the chamber by suction from a syringe to achieve a zoom function. By controlling the liquid lens to form different shapes, the liquid lens can converge light like a convex lens in a certain state, and diverge light like a concave lens in another state. Liquid lenses include any of the liquid crystal type, electrowetting type, and liquid-filled type. For example, liquid crystal and electrowetting type liquid lenses can adjust their refractive power or optical focal length by changing the applied voltage. When using liquid crystal and electrowetting type liquid lenses, their electrodes use metal thin film transparent electrodes.

[0048] In the present invention, the diopter range of the liquid lens includes adjusting the light incident on or emitted from the defocus lens, so that the myopic defocus distance of the defocus lens changes with the change of the diopter of the liquid lens, forming different myopic defocus surfaces, thereby avoiding the wearer's tolerance problem caused by the fixed myopic defocus distance. The myopic defocus distance refers to the distance between the myopic defocus surface formed by the defocus lens and the retina under the condition of no visual distance switching.

[0049] Preferably, the controller 60 is configured to adjust the diopter of the liquid lens 40 to change periodically within a preset interval, so that the wearer's peripheral myopia defocus distance changes periodically accordingly.

[0050] In the present invention, the preset interval refers to a pre-set periodically or randomly changing diopter range of the liquid lens, within which a changing peripheral hyperopic defocus and emmetropia focus in the foveal area can be formed.

[0051] The periodic change may be to set different diopters over time, or to set different diopters according to the number of times of switching between near and far vision. Each time the diopters are changed, the myopic defocus gradually increases or decreases.

[0052] Preferably, the controller is configured to adjust the refractive power of the liquid lens to vary randomly within a preset interval, so that the wearer's peripheral myopia defocus distance varies randomly accordingly.

[0053] The random change may be to randomly set the change amount of the diopter over time, so that the myopic defocus is set between the maximum value and the minimum value of the preset interval each time the change occurs.

[0054] The controller refers to a device for controlling the liquid lens, which can be set as a manual control knob to determine the diopter of the liquid lens according to the manual input of the user. For example, the manual control knob is set to multiple gears. When the manual control knob is rotated to the first gear, the voltage or the filling amount of the liquid lens is controlled to make the liquid lens at the first diopter. When the manual control knob is rotated to the second gear, the voltage or the filling amount of the liquid lens is controlled to make the liquid lens at the second diopter.

[0055] Figure 5 A schematic diagram showing a liquid lens adjusting light incident on a defocused lens.

[0056] like Figure 5 As shown, the liquid lens 40 is arranged in a direction away from the eye relative to the defocus lens 10. By adjusting the liquid lens 40, the peripheral myopia defocus surface formed by the defocus lens 10 is Figure 3 The L3 is changed to Figure 5 When the liquid lens 40 is arranged in a direction close to the eye with respect to the defocus lens 10, the liquid lens 40 adjusts the light emitted from the defocus lens 10, and the same function can be achieved by controlling the diopter of the liquid lens 40.

[0057] According to one embodiment of the present invention, the controller 60 is configured to control the diopter of the liquid lens to switch from the first diopter to the second diopter according to the change in the viewing distance when the viewing distance of the wearer of the composite defocusing lens switches from far to near. Preferably, the first diopter is set so that the liquid lens converges light and reduces the wearer's hyperopic defocus; the second diopter is 0 or within a preset range; and the absolute value of the first diopter is greater than the absolute value of the second diopter.

[0058] Figure 6 A schematic diagram showing the liquid lens instantly adjusting the light incident on the defocused lens when switching from long-distance vision to close-up vision.

[0059] According to the inherent structure of the human eye, when you need to see nearby objects, the convexity of the lens is expanded by contracting the smooth muscle and relaxing the suspensory ligaments, making it easier for nearby light to enter the eye and be projected onto the retina to form an image, thereby helping the human body to see nearby objects clearly.

[0060] like Figure 6 As shown in the figure, when switching from long-distance vision to close-up vision, the lens of the eye adjusts slowly, which will cause the following Figure 2 The temporary hyperopic defocus area shown is the part where L2 exceeds the cornea 30. The present invention controls the liquid lens 40 to be at the first diopter at this moment to achieve the function of converging light, so that the focal plane L5 can be moved toward the front of the retina 30. In this process, the diopter of the liquid lens is set to retain the partial hyperopic defocus of the focal plane L5 to promote the rapid deformation of the lens. As the lens deforms, the diopter of the liquid lens 40 is gradually reduced until the diopter is 0 or maintained in a lower range.

[0061] exist Figure 6 In the embodiment, the liquid lens 40 is arranged in a direction away from the eye relative to the defocus lens 10. By adjusting the liquid lens 40, the focal plane of the defocus lens 10 is L5, relative to Figure 2 In the focal plane L2 before adjustment, the hyperopic defocus of the fovea area and the hyperopic defocus of the peripheral area are both reduced.

[0062] Figure 7 A schematic diagram showing a liquid lens adjusting light incident on a defocused lens after a period of time when switching from long-distance vision to close-up vision.

[0063] After a period of time when the eye switches from long-distance vision to close-up vision, the thickness of the lens has been adjusted by the ciliary muscle to adapt to close-up vision. Figure 6 The L5 position is adjusted to Figure 7At the L6 position, the diopter of the liquid lens is reduced to the second diopter within the preset interval. At this time, when the diopter of the liquid lens is within the preset interval, only the light adjustment amount that causes the peripheral myopia defocus surface of the defocus lens to change is provided. "A period of time" refers to the adjustment time of the eye's lens.

[0064] According to one embodiment of the present invention, the liquid lens 40 may also be disposed between the human eye and the defocus lens 10 to adjust the light emitted from the defocus lens 10 .

[0065] According to one embodiment of the present invention, the controller 60 is a microprocessor, and one or more control modes are built into the microprocessor or input by the user. The microprocessor outputs a control signal to the liquid lens according to different control modes to control the switching of the diopter of the liquid lens. For example, when the liquid lens adopts a liquid crystal type or an electrowetting type, the control signal output by the microprocessor is a voltage, and the voltage under the corresponding control mode is output to the electrode of the liquid lens, thereby controlling the switching of the diopter of the liquid lens. For another example, when the liquid lens adopts a liquid-filled type, the control signal output by the microprocessor is a deformation amount, and the infusion pump controls the switching of the diopter of the liquid lens according to the deformation amount.

[0066] Among them, the control mode in the microprocessor is different control instructions or programs, which can be multiple to meet different visual needs.

[0067] According to one embodiment of the present invention, the composite defocusing lens also includes a distance sensor connected to the controller, the distance sensor is oriented in the direction of the wearer's line of sight, and is used to provide the wearer's viewing distance; the controller adjusts the refractive power of the liquid lens based on the change in the wearer's viewing distance.

[0068] According to one embodiment of the present invention, the composite defocusing mirror also includes an eye tracker and a distance sensor connected to the controller, the eye tracker is used to provide eye tracking information of the user; the distance sensor is used to provide the distance of the object in the direction of the user's line of sight; the controller adjusts the refractive power of the liquid lens based on the change in the distance of the object in the direction of the user's line of sight.

[0069] Eye trackers can track eye position and eye movement. By using many methods for tracking the user's eyes, the user's line of sight can be obtained to determine the object the user is observing. Distance sensors can measure the distance of an object. By measuring the distance change of an object in the direction of the user's line of sight, combined with the designed object distance range of the defocus lens, the diopter requirement of the liquid lens can be obtained. Then, the diopter of the liquid lens is adjusted by the controller until the diopter requirement is reached.

[0070] According to one embodiment of the present invention, the controller includes a timing module, and the timing module is used to control the activation time of the liquid lens. The activation time refers to the working time of the liquid lens. The training time can be set in the timing module built into the controller to automatically end the visual training and restore the liquid lens to its initial state.

[0071] The timing module can use an existing mechanical timer or a timing program built into a microcontroller.

[0072] When the controller adopts a microprocessor, the rate of change of the voltage or deformation amount can be controlled. For example, when the speed is controlled to be larger, the user can be provided with instantaneous diopter switching.

[0073] According to one embodiment of the present invention, the controller further comprises a display module, and the display module is used to display the state parameters of the liquid lens. The display module can be set as a display screen, receives a display drive signal, and displays the state parameters of the liquid lens. The state parameters include at least one of the following: diopter, speed, and duration.

[0074] According to one embodiment of the present invention, the controller further includes a voice module, which is used to broadcast the state parameters of the liquid lens. The voice module receives a voice broadcast driving signal and broadcasts the state parameters of the liquid lens. The state parameters include at least one of the following: diopter, speed, and duration.

[0075] According to one embodiment of the present invention, the controller further comprises a human-machine interface, which is used for a user to input control instructions for the liquid lens, such as a USB interface, a wireless interface, and the like.

[0076] According to one embodiment of the present invention, the controller further comprises a storage module, and the storage module is used to store at least one set of operating instructions for controlling the liquid lens.

[0077] According to one embodiment of the present invention, when the liquid lens adopts a liquid crystal type or an electrowetting type, the electrode of the liquid lens is a metal thin film transparent electrode. The metal thin film transparent electrode can be a silver thin film, a gold thin film or a silver-indium tin oxide composite film with high conductivity, high transmittance and mechanical stability.

[0078] In the present invention, a liquid lens is used to adjust the light incident on or emitted from the defocus lens, thereby changing the peripheral myopia defocus distance, and the wearer's myopia defocus tolerance can be overcome. By setting a periodic change or a random change within a preset interval, the change of the peripheral myopia defocus distance is regular or random, and the wearer's myopia defocus tolerance is further overcome. By controlling the refractive power of the liquid lens by the change in the viewing distance, the hyperopia defocus amount caused by the switching of near and far viewing and the hysteresis adjustment can be reduced. By setting a distance sensor to provide the wearer's viewing distance, the change in the viewing distance can be obtained in real time. By setting the electrode of the liquid lens to a metal film transparent electrode, the light blocking phenomenon caused by the electrode can be reduced.

[0079] Although multiple embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art may conceive of many changes, modifications, and alternatives without departing from the thought and spirit of the present invention. It should be understood that in the process of practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The appended claims are intended to define the scope of protection of the present invention, and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A composite defocusing lens, characterized in that: include: Defocus lenses, liquid lenses, brackets and controllers; The defocus lens and the liquid lens are coaxially mounted on the bracket; The support is configured to enable the defocused lens and the liquid lens to be located in front of the wearer's eyes; The liquid lens is configured to: have at least one diopter to adjust the light incident on or emitted from the defocused lens; The controller is connected to the liquid lens and is used to adjust the diopter of the liquid lens.

2. The composite defocusing mirror according to claim 1, characterized in that: The controller is configured to adjust the diopter of the liquid lens to change periodically within a preset interval, so that the peripheral myopia defocus distance of the wearer changes periodically accordingly.

3. The composite defocusing mirror according to claim 1, characterized in that: The controller is configured to adjust the diopter of the liquid lens to randomly change within a preset interval, so that the wearer's peripheral myopia defocus distance changes randomly accordingly.

4. The composite defocusing mirror according to claim 1, characterized in that: The controller is configured to control the refractive power of the liquid lens to switch from a first refractive power to a second refractive power according to a change in the viewing distance when the viewing distance of the wearer of the composite defocusing lens switches from far to near.

5. The composite defocusing mirror according to claim 4, characterized in that: The first diopter is set so that the liquid lens converges light and reduces the wearer's hyperopic defocus; The second diopter is 0 or within a preset range; An absolute value of the first diopter is greater than an absolute value of the second diopter.

6. The composite defocusing lens according to claim 1, characterized in that: Also includes a distance sensor connected to the controller, The distance sensor is oriented in the direction of the wearer's line of sight and is used to provide the wearer's viewing distance; The controller adjusts the diopter of the liquid lens based on a change in the wearer's viewing distance.

7. The composite defocusing lens according to claim 1, characterized in that: The liquid lens includes any one of a liquid crystal type, an electrowetting type, and a liquid-filled type.

8. The composite defocusing lens according to claim 7, characterized in that: When the liquid lens is of liquid crystal type or electrowetting type, the electrodes of the liquid lens are metal thin film transparent electrodes.

9. The composite defocusing lens according to claim 1, characterized in that: The controller comprises a timing module, and the timing module is used to control the activation duration of the liquid lens.

10. The composite defocusing lens according to claim 1, characterized in that: The controller further comprises a display module, and the display module is used to display the state parameters of the liquid lens.

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