Lens switching mechanism, lens switching device and visual function inspection training instrument

Abstract

The utility model discloses a lens switching mechanism, a lens switching device and a visual function inspection training instrument. The lens switching mechanism comprises a vertical bracket, a lens switching turntable and a driving motor for driving the lens switching turntable to rotate, the lens switching turntable comprises a turntable body, an annular bracket and a lens; the turntable body is pivotally assembled on the inner side of the vertical bracket and is in transmission connection with the driving motor; the annular support is arranged on the inner side of the rotary table body and is coaxial with the rotary table body, and an opening of the annular support is gradually enlarged in the direction from outside to inside; a plurality of mounting holes are formed in the annular support at intervals in the circumferential direction, the lenses are selectively mounted in the mounting holes, the transverse size of a product can be reduced, the inclined rotary disc body and the annular support are arranged through the hollow space in the front side of the display screen, and the spatial arrangement of the product is optimized.

Description

Technical Field

[0001] This utility model relates to the field of vision testing and training technology, and in particular to a lens switching mechanism, a lens switching device, and a vision function testing and training instrument. Background Technology

[0002] With the widespread use of electronic products, the rate of myopia among teenagers is increasing year by year, and some primary school students are already nearsighted, making the problem increasingly serious. Mild or moderate myopia can be helped to slow down vision decline and restore vision through corrective training.

[0003] Vision correction training generally uses the following method: The patient looks at the markings on the screen, such as the letter E. A turntable is placed in front of the screen with lenses of different powers. By switching between different lenses, the ciliary muscle is stimulated, which can help exercise the ciliary muscle and alleviate myopia.

[0004] In the prior art, Chinese utility model patent with publication number CN221511864U discloses a visual function testing and training device: including a housing and a lens switching assembly, a display and a controller disposed in the housing; the lens switching assembly includes two lens holders rotatably connected in the housing, and the lens holders are provided with a number of lens mounting holes for different lenses.

[0005] The drawback of the above technology is that the lens mounting holes are directly located on the edge of the disc-shaped lens holder. The lens holder can only be arranged in the left-right direction and made perpendicular in the front-back direction so that the lens can be aligned with the display screen behind it. This results in the two lens holders occupying a large width space, more than twice the diameter of the lens holder. The front-back cavity between the display and the lens holder is also large and not fully utilized. The space arrangement needs to be optimized. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a lens switching mechanism, a lens switching device, and a vision function testing and training instrument. The turntable body is provided with an expanded ring support, which is located inside the turntable body and is used to install multiple lenses. When arranged, the two sets of lens switching turntables can be arranged at an angle. The two sets of lens switching turntables are no longer perpendicular to the front-back direction, but are arranged at an angle to the rear, thereby reducing the horizontal space occupied by the two sets of lens switching turntables, which is conducive to reducing the horizontal size of the product. The space in front of the display screen is used to arrange the inclined turntable body and its ring support, thus optimizing the spatial layout of the product.

[0007] This utility model provides a lens switching mechanism, including a vertical support, a lens switching turntable, and a drive motor for driving the lens switching turntable to rotate.

[0008] The lens switching turntable includes a turntable body, a ring support, and a lens;

[0009] The turntable body is pivotally mounted on the inner side of the vertical support and is connected to the drive motor.

[0010] The annular support is located on the inner side of the turntable body and is arranged coaxially with the turntable body. The opening of the annular support gradually increases in the direction from the outside to the inside.

[0011] The annular bracket has multiple mounting holes spaced apart along the circumference, and the lens can be selectively mounted in the mounting holes.

[0012] In one of the alternative technical solutions, the annular support is located at the edge of the turntable body.

[0013] In one of the alternative technical solutions, the annular bracket includes multiple bracket plates, and the mounting holes are provided on the bracket plates;

[0014] Each of the support plates is connected to the turntable body, and the distance between the support plate and the central axis of the turntable body gradually increases along the direction from the outside to the inside.

[0015] In one of the alternative technical solutions, any two adjacent support plates are placed together.

[0016] In one of the alternative technical solutions, a mounting plate is connected to one end of the support plate that is connected to the turntable body, and the included angle between the mounting plate and the support plate is an obtuse angle;

[0017] The mounting plate is detachably connected to the turntable body.

[0018] In one of the alternative technical solutions, the drive motor is mounted on the vertical bracket, and the vertical bracket is also provided with a reset trigger mechanism.

[0019] The present invention also provides a lens switching device, including a guide rail, two sets of lens switching mechanisms as described above, and an adjustment mechanism for adjusting the distance between the two sets of lens switching mechanisms.

[0020] The vertical supports of the two lens switching mechanisms are slidably mounted on the guide rail, and the adjustment mechanism is connected to the two vertical supports respectively;

[0021] In particular, the distance between the two annular supports gradually increases along the front-to-back direction.

[0022] In one of the alternative technical solutions, the adjusting mechanism includes a first screw with a positive external thread, a second screw with a negative external thread, and a drive motor for driving the first screw and the second screw to rotate;

[0023] The first screw is threadedly connected to one of the vertical supports, and the second screw is threadedly connected to the other vertical support.

[0024] This utility model also provides a visual function testing and training instrument, including a body, an operation panel, a display screen, and a lens switching device as described above.

[0025] The control panel is located on the outside of the machine body, and an eyepiece is provided at the front end of the machine body;

[0026] The display screen and the lens switching device are respectively located in the body, with the display screen positioned behind the lens switching device.

[0027] In one of the alternative technical solutions, the front end of the body is provided with a chin rest that can be raised and lowered.

[0028] The above technical solution has the following beneficial effects:

[0029] This utility model provides a lens switching mechanism, lens switching device, and vision function testing and training instrument, including a vertical support, a lens switching turntable, and a drive motor. The lens switching turntable is located inside the vertical support and is driven to rotate by the drive motor. The lens switching turntable includes a turntable body, a ring support, and multiple lenses. The ring support is located inside the turntable body and is expanded in shape. Multiple lenses of different powers are arranged along the circumference on the ring support. During installation and assembly, the two sets of lens switching turntables can be assembled in an inclined manner in the body of the vision function testing and training instrument. The two sets of lens switching turntables are no longer perpendicular to the front-back direction, but are arranged obliquely backward, thereby reducing the lateral space occupied by the two sets of lens switching turntables, which is beneficial to reducing the lateral size of the product. Furthermore, the hollow space in front of the display screen is used to arrange the inclined turntable body and the ring support, optimizing the spatial layout of the product. Attached Figure Description

[0030] The disclosure of this utility model will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings:

[0031] Figure 1 A perspective view of a lens switching mechanism provided in an embodiment of the present invention, viewed from the inside out.

[0032] Figure 2 A perspective view of a lens switching mechanism provided in an embodiment of the present invention from an outside-in perspective;

[0033] Figure 3 A 3D view showing a mounting plate connected to one end of a bracket plate;

[0034] Figure 4 A cross-sectional view of the lens installed in the mounting hole;

[0035] Figure 5 This is a front view of a lens switching device provided in an embodiment of the present invention;

[0036] Figure 6 for Figure 5 Rear view of the two lens switching mechanisms in the middle;

[0037] Figure 7 This is a front view of a visual function testing and training device provided in an embodiment of the present invention;

[0038] Figure 8 A side view of a visual function testing and training device provided in an embodiment of this utility model;

[0039] Figure 9 This is a schematic diagram of the visual function testing and training instrument provided in an embodiment of the present invention after the housing has been opened;

[0040] Figure 10 for Figure 9 Front view;

[0041] Figure 11 This is a cross-sectional view showing the connection between the handle mechanism and the chin rest. Detailed Implementation

[0042] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0043] like Figure 1-4 As shown, an embodiment of the present invention provides a lens switching mechanism 100, which includes a vertical support 1, a lens switching turntable 2, and a drive motor 3 for driving the lens switching turntable 2 to rotate.

[0044] The lens switching turntable 2 includes a turntable body 21, a ring support 22, and a lens 23.

[0045] The turntable body 21 is pivotally mounted on the inside of the vertical support 1 and is connected to the drive motor 3 for transmission.

[0046] The annular support 22 is located inside the turntable body 21 and is arranged coaxially with the turntable body 21. The opening of the annular support 22 gradually increases in the direction from the outside to the inside.

[0047] The annular bracket 22 has a plurality of mounting holes 222 spaced along the circumference, and a lens 23 can be selectively mounted in the mounting holes 222.

[0048] The lens switching mechanism 100 provided by this utility model is used for Figure 7-10 In the visual function testing and training device 300 shown, lenses 23 with different prescriptions are switched. When the lens switching mechanism 100 is used in the visual function testing and training device 300, two sets of lens switching mechanisms 100 arranged opposite to each other are used. Figure 5 The lens switching device 200 shown is adapted to fit the user's two eyes accordingly.

[0049] The lens switching mechanism 100 includes a vertical support 1, a lens switching turntable 2, and a drive motor 3. The vertical support 1 supports the lens switching turntable 2. During installation, the vertical support 1 is installed in the body 301 of the vision function testing and training instrument 300. In this embodiment, the side of the vertical support 1 closest to the housing of the body 301 is referred to as the outer side, and the side of the vertical support 1 closest to the optical path of the line of sight is referred to as the inner side.

[0050] The lens switching turntable 2 is mounted inside the vertical support 1 and can rotate relative to the vertical support 1. It can be mounted via a shaft, bearings, etc. The drive motor 3 can be mounted on the vertical support 1 or in other locations. The lens switching turntable 2 is connected to the drive motor 3 through a transmission mechanism, and the drive motor 3 drives the lens switching turntable 2 to rotate. Preferably, the drive motor 3 is mounted on the vertical support 1, and the lens switching turntable 2 is directly mounted on the shaft of the drive motor 3, which simplifies the installation structure and saves installation space.

[0051] The lens switching turntable 2 includes a turntable body 21, a ring support 22, and multiple lenses 23. The multiple lenses 23 use different prescriptions, which is existing technology and will not be described in detail here.

[0052] The lens switching turntable 2 is installed inside the vertical bracket 1 and can rotate relative to the vertical bracket 1. Specifically, it can be installed through a rotating shaft, bearing, etc.

[0053] The annular support 22 is located on the inner side of the turntable body 21. The annular support 22 and the turntable body 21 are arranged concentrically. The turntable body 21 is directly connected to the drive motor 3 or connected through a transmission structure.

[0054] The annular support 22 in this invention refers to a support with a roughly annular shape. Its outline can be a regular ring or a ring with angles or breaks. The annular support 22 expands from the outside in, meaning the opening of the annular support 22 gradually increases in size from the outside in, causing the annular support 22 to extend both along the inner side of the turntable body 21 and along the radial direction of the turntable body 21, forming a funnel-shaped or flared structure. The dimensions of the annular support 22 can be set as needed.

[0055] Multiple mounting holes 222 are spaced along the circumference on the annular bracket 22. These mounting holes 222 are through holes. Lenses 23 can be selectively installed in the mounting holes 222. This means that lenses 23 of appropriate power can be selected for installation in the mounting holes 222, or that lenses 23 can be installed in the remaining mounting holes 222 without being installed in one or several of them. In use, the lens switching mechanism 100 is arranged at an angle, with the turntable body 21 at an acute angle to the visual path in the front-to-back direction. The front portion is tilted inward, and the rear portion is tilted outward. The user's glasses can see the display screen behind them through a lens 23 without obstructing their view. Specifically, two sets of lens switching turntables 2 are assembled at an angle in the body 301 of the vision function examination and training instrument 300, located in front of the display screen 303. The turntable body 21 is no longer perpendicular to the front-to-back direction but is arranged at an angle to the rear, thereby reducing the lateral space occupied by the two sets of lens switching turntables 2. Assuming the maximum outer diameter of the turntable body 21 is D, the maximum distance between the two tilted turntable bodies 21 in the body 301 is less than 2D, which helps to reduce the lateral size of the product. At the same time, the hollow space in front of the display screen 303 is used to arrange the tilted turntable body 21 and the ring bracket 22, thus optimizing the spatial arrangement of the product.

[0056] In one embodiment, such as Figure 1-2 As shown, the annular bracket 22 is located on the edge of the turntable body 21, which optimizes the combination structure of the annular bracket 22 and the turntable body 21. The edge of the turntable body 21 will not protrude from the annular bracket 22. The radius at the edge of the turntable body 21 is the largest, and the size of the annular bracket 22 connected to the edge of the turntable body 21 is also the largest, so more lenses 23 can be arranged.

[0057] In one embodiment, such as Figure 1-2 As shown, the annular bracket 22 includes multiple bracket plates 221, and mounting holes 222 are provided on the bracket plates 221.

[0058] Each support plate 221 is connected to the turntable body 21, and the distance between the support plate 221 and the central axis of the turntable body 21 gradually increases along the direction from the outside to the inside.

[0059] In this embodiment, the ring bracket 22 is composed of multiple bracket plates 221. As needed, mounting holes 222 can be opened on each bracket plate 221, or mounting holes 222 can be opened on the bracket plate 221 at a specified position.

[0060] The tail end of each support plate 221 is connected to the turntable body 21. The tail end of each support plate 221 extends inward towards the inside of the turntable body 21. That is, along the direction from the outside to the inside, the distance between the support plate 221 and the central axis of the turntable body 21 gradually increases, so that the ring support 22 is in an expanding shape.

[0061] In one embodiment, such as Figure 1-2 As shown, any two adjacent support plates 221 are placed together to form a complete closed-loop structure.

[0062] In one embodiment, such as Figure 1-3 As shown, the end of the support plate 221 that is connected to the turntable body 21 is connected to the mounting plate 223, and the included angle between the mounting plate 223 and the support plate 221 is an obtuse angle.

[0063] Mounting plate 223 is detachably connected to turntable body 21.

[0064] In this embodiment, the tail end of the support plate 221 is provided with a mounting plate 223. The mounting plate 223 is narrower than the support plate 221. The mounting plate 223 is detachably connected to the turntable body 21 by means of pins, bolts, etc.

[0065] The angle formed between the mounting plate 223 and the support plate 221 is an obtuse angle, so that the support plate 221 extends inward toward the inside of the turntable body 21, thereby forming an expanded annular support 22.

[0066] When the turntable body 21 is tilted, the support plate 221 can extend roughly in the left-right direction, so that the eyes can pass through the lens 23 to view the display screen 303 behind.

[0067] Preferably, the mounting plate 223 is connected to the outside of the turntable body 21, and the bracket plate 221 extends obliquely from the edge of the turntable body 21 toward the inside of the turntable body 21.

[0068] Preferably, the mounting plate 223 and the bracket plate 221 are integrated, resulting in high structural strength and a more stable and reliable connection.

[0069] In one embodiment, such as Figure 2 As shown, the drive motor 3 is mounted on the vertical bracket 1, and the vertical bracket 1 is also equipped with a reset trigger mechanism 4.

[0070] In this embodiment, the drive motor 3 is mounted on the vertical support 1, and its shaft passes through the vertical support 1 and is connected to the turntable body 21.

[0071] After each inspection, the drive motor 3 needs to be used to reset the lens switching turntable 2 to its initial position for the next use.

[0072] Preferably, a reset trigger mechanism 4 is provided on the vertical support 1 to monitor the reset status of the lens switching turntable 2.

[0073] The reset trigger mechanism 4 can be a trigger switch, sensor, etc.

[0074] For example, a protrusion is provided on the turntable body 21, and a trigger switch 41 is provided in a certain area of ​​the vertical support 1. Figure 2 Only the back side of the trigger switch 41 is shown, with its trigger head facing the turntable body 21. When the protrusion touches the trigger head of the trigger switch 41, it indicates that the lens switching turntable 2 is in the initial position.

[0075] During use, the lens switching dial 2 is driven to rotate at a certain angle, at which point the protrusion moves away from the trigger switch 41. After use, the drive motor 3 drives the lens switching dial 2 to reset. When the protrusion touches the trigger head of the trigger switch 41, the drive motor 3 stops rotating to keep the lens switching dial 2 in its initial position.

[0076] Of course, the aforementioned trigger switch 41 and drive motor 3 are respectively connected to the control module (chip, control circuit board, etc.) of the visual function inspection and training instrument 300, and are automatically controlled by the control module.

[0077] like Figure 5-6 As shown, an embodiment of the present invention provides a lens switching device 200, including a guide rail 201, two sets of lens switching mechanisms 100 as described in any of the foregoing embodiments, and an adjustment mechanism 202 for adjusting the distance between the two sets of lens switching mechanisms 100.

[0078] The vertical supports 1 of the two lens switching mechanisms 100 are slidably mounted on the guide rail 201, and the adjustment mechanism 202 is connected to the two vertical supports 1 respectively.

[0079] In particular, the distance between the two annular supports 22 gradually increases along the front-to-back direction.

[0080] The lens switching device 200 provided by this utility model is used in the vision function testing and training instrument 300.

[0081] The lens switching device 200 includes a guide rail 201, an adjustment mechanism 202, and two sets of lens switching mechanisms 100.

[0082] For details regarding the structure, construction, and working principle of the lens switching mechanism 100, please refer to the previous description of the lens switching mechanism 100; further details will not be repeated here.

[0083] The guide rail 201 is mounted on the base plate of the body 301 of the vision function testing and training instrument 300 along the left-right direction. The vertical supports 1 of the two lens switching mechanisms 100 are slidably connected to the guide rail 201. The adjustment mechanism 202 is connected to the vertical supports 1 of the two lens switching mechanisms 100, thereby adjusting the distance between the two lens switching mechanisms 100, and thus adjusting the distance between the two annular supports 22, so that the corresponding two lenses 23 on the two annular supports 22 can be adapted to the user's eye distance. The adjustment mechanism 202 can be a manual adjustment mechanism or an electric adjustment mechanism.

[0084] Two lens switching mechanisms 100 are arranged opposite each other and are tilted. The distance between the two annular supports 22 gradually increases along the front-to-back direction. The turntable body 21 is arranged at an acute angle to the line of sight in the front-to-back direction, with the front part tilting inward and the rear part tilting outward. The user's glasses can look at the display screen 303 behind through a lens 23 without obstructing the view. This also reduces the lateral dimension between the two lens switching mechanisms 100. At the same time, the hollow space in front of the display screen 303 is used to arrange the tilted turntable body 21 and the annular supports 22, optimizing the spatial layout of the product.

[0085] In one embodiment, such as Figure 5 As shown, the adjustment mechanism 202 includes a first screw 2021 with a positive external thread, a second screw 2022 with a negative external thread, and a drive motor 2023 for driving the first screw 2021 and the second screw 2022 to rotate.

[0086] The first screw 2021 is threadedly connected to a vertical bracket 1, and the second screw 2022 is threadedly connected to another vertical bracket 1.

[0087] In this embodiment, the adjustment mechanism 202 adopts a motor screw adjustment mechanism to achieve automatic adjustment with high precision. It includes a first screw 2021, a second screw 2022, and a drive motor 2023. The first screw 2021 has a forward external thread, and the second screw 2022 has a reverse external thread. The first screw 2021 and the second screw 2022 are connected to both ends of the drive motor 2023, and the drive motor 2023 drives the first screw 2021 and the second screw 2022 to rotate.

[0088] One vertical bracket 1 has a forward internal threaded hole at its bottom, and the other vertical bracket 1 has a reverse internal threaded hole at its bottom. A first screw 2021 passes through the forward internal threaded hole, and the two are threaded together; a second screw 2022 passes through the reverse internal threaded hole, and the two are threaded together.

[0089] The drive motor 2023 is mounted on the bracket or base plate or in the middle section of the guide rail 201. The drive motor 2023 drives the first screw 2021 and the second screw 2022 to rotate, thereby causing the two vertical supports 1 to move closer or further apart synchronously, thus achieving the purpose of adjusting the distance.

[0090] like Figure 7-10 As shown, an embodiment of the present invention provides a vision function testing and training instrument 300, which includes a body 301, an operation panel 302, a display screen 303, and a lens switching device 200 as described in any of the previous embodiments.

[0091] The control panel 302 is located on the outside of the body 301, and the eyepiece 304 is located at the front end of the body 301.

[0092] The display screen 303 and the lens switching device 200 are respectively located in the body 301, with the display screen 303 located behind the lens switching device 200.

[0093] The visual function testing and training instrument 300 provided by this utility model is used for testing and training myopic patients.

[0094] The visual function testing and training instrument 300 includes a main body 301, an operation panel 302, a display screen 303, an eyepiece 304, and a lens switching device 200.

[0095] For details regarding the structure, construction, and working principle of the lens switching device 200, please refer to the previous description of the lens switching device 200; it will not be repeated here. The vision function testing and training instrument 300 has a control module, such as a chip or control circuit board, used to control the operation of various electrical components.

[0096] The main body 301 includes a base plate and a shell, with an internal cavity for mounting the display screen 303 and lens switching device 200, etc. The eyepiece 304 is located at the front end of the main body 301, roughly in the middle of its width. The operation panel 302 is located on the outside of the main body 301 and can be used for user parameter setting, file storage and retrieval, observation and inspection of training progress, etc.

[0097] The display screen 303 is located at the rear end inside the body 301, and is positioned opposite to the eyepiece 304.

[0098] The lens switching device 200 is located in the body 301, between the display screen 303 and the eyepiece 304. The distance between the lens switching device 200 and the eyepiece 304, as well as the distance between the lens switching device 200 and the display screen 303, can be set as needed.

[0099] Two lens switching mechanisms 100 are arranged opposite each other along the centerline of the eyepiece 304, and the lens switching mechanisms 100 are arranged at an angle. The distance between the two turntable bodies 21 and the annular support 22 facing the eyepiece 304 is small, and the distance between them facing the display screen 303 is large. The display screen 303 is preferably located within the extension line of the two turntable bodies 21 and the annular support 22 extending obliquely backward. When the user observes the display content of the display screen 303 through the front lens 23, the rear part of the turntable bodies 21 and the annular support 22 will not obstruct the view.

[0100] During user training, the necessary procedures are first set via the control panel 302. Then, the eyes are placed on the eyepieces 304, and the content displayed on the screen 303 is observed through the foremost lens 23 on the ring bracket 22. If the display is blurry, the power of the lens 23 needs adjustment. The user can press a button on the remote control to drive the motor 3 to rotate at a preset angle, moving the next lens 23 to the foreground, and so on, until the user selects the appropriate lens 23. During rehabilitation training, the motor 3 can rotate forward and backward to adjust lenses 23 of different powers to the foreground, changing the user's view between clear and blurry, thus stimulating the ciliary muscle and helping to exercise it, potentially alleviating myopia.

[0101] Generally, the lenses 23 are installed sequentially into the mounting holes 222 of the ring bracket 22 in order of their power, so that the control module of the vision function testing and training instrument 300 can quickly position the lens with the appropriate power.

[0102] In one embodiment, such as Figure 7-10 As shown, the front of the body 301 is equipped with a chin rest 305 that can be raised and lowered to support the user's chin, which can relieve fatigue during training and also help the user to align their eyes with the eyepiece 304.

[0103] Specifically, the front end of the body 301 is provided with a bracket 306, such as Figure 11 As shown, the vertical sleeve 3051 of the chin support 305 is slidably installed in the bracket 306. A handle mechanism 307 is provided on one side of the bracket 306, and the lifting and lowering of the chin support 305 is adjusted by the handle mechanism 307.

[0104] The handle mechanism 307 includes a handle 3071, a gear set 3072, and a threaded rod 3073. The vertical sleeve 3051 has an internal thread. The threaded rod 3073 is threaded into the vertical sleeve 3051, and its lower end is connected to the output gear of the gear set 3072. Rotating the handle 3071 causes the threaded rod 3073 to rotate via the gear set 3072, thereby raising and lowering the vertical sleeve 3051, and ultimately raising and lowering the lower jaw support 305.

[0105] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0106] The above are merely the principles and preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of this utility model, and these modifications should also be considered within the scope of protection of this utility model.

Claims

1. A lens switching mechanism, characterized in that, It includes a vertical support, a lens switching turntable, and a drive motor for driving the lens switching turntable to rotate; The lens switching turntable includes a turntable body, a ring support, and a lens; The turntable body is pivotally mounted on the inner side of the vertical support and is connected to the drive motor. The annular support is located on the inner side of the turntable body and is arranged coaxially with the turntable body. The opening of the annular support gradually increases in the direction from the outside to the inside. The annular bracket has multiple mounting holes spaced apart along the circumference, and the lens can be selectively mounted in the mounting holes.

2. The lens switching mechanism according to claim 1, characterized in that, The annular support is located at the edge of the turntable body.

3. The lens switching mechanism according to claim 1, characterized in that, The annular bracket includes multiple bracket plates, and the mounting holes are provided on the bracket plates; Each of the support plates is connected to the turntable body, and the distance between the support plate and the central axis of the turntable body gradually increases along the direction from the outside to the inside.

4. The lens switching mechanism according to claim 3, characterized in that, Any two adjacent support plates are placed together.

5. The lens switching mechanism according to claim 3, characterized in that, The bracket plate is connected to a mounting plate at one end, and the angle between the mounting plate and the bracket plate is an obtuse angle. The mounting plate is detachably connected to the turntable body.

6. The lens switching mechanism according to claim 1, characterized in that, The drive motor is mounted on the vertical bracket, which is also equipped with a reset trigger mechanism.

7. A lens switching device, characterized in that, It includes a guide rail, two sets of lens switching mechanisms as described in any one of claims 1-6, and an adjustment mechanism for adjusting the distance between the two sets of lens switching mechanisms; The vertical supports of the two lens switching mechanisms are slidably mounted on the guide rail, and the adjustment mechanism is connected to the two vertical supports respectively; In particular, the distance between the two annular supports gradually increases along the front-to-back direction.

8. The lens switching device according to claim 7, characterized in that, The adjustment mechanism includes a first screw with a positive external thread, a second screw with a negative external thread, and a drive motor for driving the first screw and the second screw to rotate. The first screw is threadedly connected to one of the vertical supports, and the second screw is threadedly connected to the other vertical support.

9. A visual function testing and training device, characterized in that, Includes the main body, operation panel, display screen, and lens switching device as described in claim 7 or 8; The control panel is located on the outside of the machine body, and an eyepiece is provided at the front end of the machine body; The display screen and the lens switching device are respectively located in the body, with the display screen positioned behind the lens switching device.

10. The visual function testing and training device according to claim 9, characterized in that, The front end of the body is equipped with a chin rest that can be raised and lowered.

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