Handheld vision testing device

Abstract

The utility model provides a handheld visual detection device, including casing, and set up in the detection system and control system of casing, wherein control system is used for controlling detection system, detection system includes coaxial setting eyepiece subassembly and target display subassembly, target display subassembly with casing fixed connection, eyepiece subassembly with target display subassembly detachable connection, eyepiece subassembly includes inner mirror barrel and outer mirror barrel, inner mirror barrel with outer mirror barrel sliding sleeve joint, the one end of outer mirror barrel away from target display subassembly is equipped with eye rest, through adjusting assembly drive outer mirror barrel relative inner mirror barrel sliding. Through telescopic setting of outer mirror barrel and inner mirror barrel, effectively reduce overall volume, the convenient handheld use.

Description

Technical Field

[0001] This utility model relates to the field of vision testing, and in particular to a handheld vision testing device. Background Technology

[0002] Myopia has become a common eye disease in my country, and it is showing a trend of high incidence and younger age of onset, with the incidence of high myopia patients also increasing year by year. At present, most vision testing devices on the market are large-scale optometry equipment suitable for use in medical institutions. Their main disadvantages are that they are large in size and complicated to operate, and they are not suitable for routine home testing. Utility Model Content

[0003] The purpose of this invention is to address the deficiencies in the aforementioned technology by providing a handheld vision testing device that can be used handheld and for routine home vision testing.

[0004] The purpose of this utility model is achieved as follows: it includes a housing, and a detection system and a control system disposed on the housing; wherein,

[0005] The control system is used to control the detection system;

[0006] The detection system includes an eyepiece assembly and a target display assembly arranged coaxially; the target display assembly is fixedly connected to the housing, and the eyepiece assembly and the target display assembly are detachably connected.

[0007] The eyepiece assembly includes an inner tube and an outer tube, the inner tube and the outer tube being slidably connected, and an eye rest is provided at the end of the outer tube away from the visual target display assembly;

[0008] It also includes an adjustment component for driving the outer endoscope tube to slide relative to the inner endoscope tube.

[0009] In the above technical solution, the outer and inner tubes of the eyepiece assembly slide together, and the position of the outer tube relative to the inner tube is adjusted by an adjustment component. Through the two-stage telescopic structure formed by the outer and inner tubes, the distance between the eye and the visual target is adjusted, effectively reducing the overall size of the vision testing device, enabling handheld use, and making it suitable for routine home vision testing.

[0010] In one possible implementation, the adjusting assembly includes a rotating sleeve; the rotating sleeve is rotatably disposed within the housing, and a knob is fixedly connected to the rotating sleeve, the knob being exposed on the outside of the housing;

[0011] It also includes a lifting sleeve, which is disposed between the rotating sleeve and the outer lens tube; the lifting sleeve is connected to the eye rest;

[0012] The rotating sleeve has a spiral groove on its wall, and a first sliding column fixedly connected to the lifting sleeve is provided in the spiral groove.

[0013] In one possible implementation, the spiral groove includes a first spiral groove and a second spiral groove;

[0014] The first spiral groove is slidably connected to the first sliding column;

[0015] The second spiral groove is slidably connected to the second sliding column; the second sliding column is fixedly connected to the sensing ruler, which is slidably arranged along the axial direction of the rotating sleeve.

[0016] In one possible implementation, the eyepiece assembly further includes an imaging component disposed within the inner tube of the eyepiece assembly;

[0017] The imaging assembly includes an interchangeable first imaging assembly and a second imaging assembly;

[0018] The first imaging component includes a support cylinder, with a first spherical lens at one end of the support cylinder near the eye rest and a first light-emitting element at the other end away from the eye rest. Four visual target display holes are evenly distributed around the circumference of the support cylinder, and a first light guide column is provided inside each visual target display hole.

[0019] The second imaging component includes a second spherical lens and a second light-emitting element placed at the end of the endoscope tube away from the eye rest, and four target display holes evenly arranged along the outer circumference of the second spherical lens, with a second light guide column provided in each target display hole.

[0020] In one possible implementation, the eye rest is magnetically connected to the lifting sleeve; the imaging component is magnetically connected to the visual target display component.

[0021] In one possible implementation, the eye rest is provided with a first magnetic element at one end near the lifting sleeve, and the first magnetic element is fixedly connected to the eye rest or the outer lens barrel.

[0022] The end of the lifting sleeve is provided with a second magnetic element;

[0023] The first magnetic component and the second magnetic component are magnetically attracted to each other.

[0024] In one possible implementation, a plurality of third magnetic elements are disposed around the end circumference of the imaging component near the target display component, and a fourth magnetic element is disposed at the end of the target display component corresponding to the third magnetic elements of the imaging component.

[0025] In one possible implementation, the visual target display assembly includes a first cylindrical body and a second cylindrical body that are sleeved together. The first cylindrical body is fixedly connected to the housing, and the second cylindrical body is slidably connected to the housing. The second cylindrical body is provided with a first display screen facing the bottom of the first cylindrical body. A push-button that is partially exposed outside the housing is connected to the outside of the second cylindrical body.

[0026] It also includes a position recognition component, which is used to identify the relative position of the second cylinder and the first cylinder.

[0027] In one possible implementation, the location recognition component includes a location light source board and a color sensor receiving board;

[0028] The position light source plate slides against the second cylinder. When the second cylinder slides to different positions, the position light source plate emits different colors. The color sensor receiving plate is used to identify the color emitted by the position light source plate.

[0029] In one possible implementation, the control system includes a second display screen, a scroll wheel, and function buttons disposed on the housing. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0031] Figure 2 This is an exploded view of the vision testing device of this utility model;

[0032] Figure 3 This is a cross-sectional structural diagram of the vision testing device of this utility model;

[0033] Figure 4 This is a cross-sectional structural diagram of the eyepiece assembly including the first imaging component of this utility model;

[0034] Figure 5 This is a cross-sectional structural diagram of the eyepiece assembly including the second imaging component of this utility model;

[0035] Figure 6 This is a schematic diagram of the visual target display method of this utility model. Detailed Implementation

[0036] This application provides a handheld vision testing device. The outer and inner lens tubes of the eyepiece assembly slide together, and the position of the outer lens tube relative to the inner lens tube is adjusted by an adjustment component. Through the two-stage telescopic structure formed by the outer and inner lens tubes, the distance between the eye and the visual target is adjusted, effectively reducing the overall size of the vision testing device, enabling handheld use, and making it suitable for routine home vision testing. This solves the problems of large size and inconvenience in using existing vision testing devices.

[0037] To facilitate understanding of the technical solution of this application, its application scenarios are described below: The handheld vision testing device of this application has the advantages of small size and convenient handheld use, and can be applied in professional vision examination settings as well as for routine home vision testing. Its main function is to detect refractive error and uncorrected visual acuity, with refractive error detection and uncorrected visual acuity detection respectively performed by interchangeable first and second imaging components. Since the imaging components are located within the eyepiece assembly, and the eyepiece assembly is magnetically connected to the testing device body, it is easy to replace.

[0038] The following description, in conjunction with the accompanying drawings, further illustrates this implementation case:

[0039] Depend on Figure 1 — Figure 6 As can be seen, this application includes a housing 1, and a detection system 2 and a control system 3 disposed on the housing 1. The control system 3 is used to control the detection system 2. As an example, for convenient handheld use, this application sets the housing 1 as a flat strip, and arranges the control system 3 and the detection system 2 along the width direction of the housing 1. Specifically, it includes a left housing 11 and a right housing 12 that are fastened together. After the left housing 11 and the right housing 12 are fastened together, an anti-slip member 14 is fixedly provided on the side near the detection system 2, and a control panel 13 is provided on the side near the control system 3, exposing the operable parts of the control system 3 on the control panel 13. In use, one hand can hold the anti-slip member 14, and the other hand can operate the control system 3.

[0040] It should be noted that the control system in this application also includes a power supply module. The power supply module can be powered by a plug-in connector or by a battery. When powered by a plug-in connector, a socket can be provided in the housing 1 or a power cord can be directly led out, connecting to a power source through the socket or power cord. When powered by a battery, a battery compartment 15 can be provided inside the housing 1, housing a rechargeable battery or a dry cell battery. When a rechargeable battery is used, the housing 1 should have a corresponding charging port; when a dry cell battery is used, the housing 1 should have a removable cover on the outside of the battery compartment 15 for easy battery replacement.

[0041] To reduce the size of the vision testing device, the testing system 2 in this application includes an eyepiece assembly 21 and a target display assembly 22 coaxially arranged. The target display assembly 22 generates a first target and images it within the eyepiece assembly 21 using optical principles. The target display assembly 22 is fixedly connected to the housing 1, while the eyepiece assembly 21 is detachably connected to the target display assembly 22. The eyepiece assembly includes an inner tube 211 and an outer tube 212, which are slidably fitted together. An eye rest 213 is provided at the end of the outer tube 212 away from the target display assembly 22. An auxiliary spherical lens can be placed on top of the eye rest 213 to expand the detection range. The outer tube is driven to slide relative to the inner tube by an adjustment assembly 23. This creates a two-stage telescopic structure for the eyepiece assembly 2, effectively reducing the overall size and facilitating handheld use.

[0042] The adjustment component 23 can drive the outer endoscope tube 212 to slide relative to the inner endoscope tube 211 in either an electric or manual manner. For example, a small motor can be used to drive the outer endoscope tube 212 to slide relative to the inner endoscope tube 211 through a transmission component such as a lead screw; alternatively, a manual rotary or linear motion device can be used to drive the outer endoscope tube 212 to slide relative to the inner endoscope tube 211.

[0043] To improve the accuracy of the test results, as an example, this application includes a stacked cylinder lens 214 and an auxiliary spherical lens 215 inside the outer tube 212, with the auxiliary spherical lens 215 located close to the eye rest 213. When the user has high astigmatism, the measured refractive error is inaccurate. In this case, the cylinder lens 214 can be added to neutralize the user's astigmatism, achieving an effect without astigmatism and improving the accuracy of the measurement results. The auxiliary spherical lens 215 can expand the detection range.

[0044] As described above, the outer lens tube 212 and the inner lens tube 211 of the eyepiece assembly 21 slide together, and the position of the outer lens tube 212 relative to the inner lens tube 211 is adjusted by the adjusting component 23. Through the two-stage telescopic structure formed by the outer lens tube 212 and the inner lens tube 211, the distance between the eye and the visual target is adjusted, effectively reducing the overall size of the vision testing device, enabling handheld use, and making it suitable for routine home vision testing.

[0045] In one optional embodiment, the adjusting assembly 23 includes a rotating sleeve 231. The rotating sleeve 231 is rotatably positioned within the housing 1, and a knob 232 is fixedly connected to the rotating sleeve 231, with the knob 232 exposed on the outside of the housing 1. The knob 232 being exposed on the outside of the housing 1 can be partially or completely exposed. The key requirement is that the knob 232 can be manually rotated, thereby rotating the rotating sleeve 231.

[0046] To enable the outer lens barrel 212 to slide along its axial direction when the knob 232 is rotated, this application provides a lifting sleeve 233. The lifting sleeve 233 is located between the rotating sleeve 231 and the outer lens barrel 212 and is connected to the eye rest 213. The wall of the rotating sleeve 231 has a spiral groove 2311, within which a first sliding post 2331 is fixedly connected to the lifting sleeve 233. When the knob 232 is rotated, the knob 232 drives the rotating sleeve 231 to rotate, at which time the spiral groove 2311 rotates synchronously with the rotating sleeve 231. The rotation of the spiral groove 2311 drives the first sliding post 2331 to slide within the spiral groove 2311 and displace along the axial direction of the rotating sleeve 231. Since the lifting sleeve 233, which is fixedly connected to the first sliding column 2331, is connected to the eye rest 213, when the lifting sleeve 233 moves along the axis of the rotating sleeve 231 with the first sliding column 2331, it synchronously drives the eye rest 213 to move. At the same time, the eye rest 213 is connected to the outer lens tube 212, and the eye rest 213 drives the outer lens tube 212 to move. The inner lens tube 211 is magnetically connected to the visual target display assembly 22, so the inner lens tube 211 is in a fixed state. This creates the extension and retraction of the outer lens tube 212 relative to the inner lens tube 211.

[0047] In one possible implementation, to accurately determine the displacement distance of the outer lens barrel 212, the spiral groove in this application includes a first spiral groove 2311a and a second spiral groove 2311b. The first spiral groove 2311a is slidably connected to the first sliding column 2331 and is used to drive the displacement of the outer lens barrel 212. The second spiral groove 2311b is slidably connected to the second sliding column 241; the second sliding column 241 is fixedly connected to a sensing ruler 242, which is slidably disposed along the axial direction of the rotating sleeve 231.

[0048] To ensure accurate measurement by the sensing ruler 242, the first spiral groove 2311a and the second spiral groove 2311b are evenly spaced around the circumference of the rotating sleeve 231, ensuring that the displacement dimensions of the first sliding column 2331 and the second sliding column 241 are the same when the rotating sleeve 231 rotates. A limit switch 244 is provided at the bottom of the sensing ruler 242. When the outer tube 212 is fully retracted relative to the inner tube 211, the sensing ruler 242 will press against the limit switch 244, and the control system 3 will automatically alert the user.

[0049] As an example, this application provides sliding grooves 243 in the housing 1 corresponding to the first sliding column 2331 and the second sliding column 241 respectively, and the two sliding columns are displaced along the two sliding grooves 243 respectively.

[0050] In one possible implementation, the eyepiece assembly 2 further includes an imaging assembly 4 disposed within the inner lens tube 211 of the eyepiece assembly 2. Due to hardware limitations, the size of the optotypes directly displayed by the optotype display assembly 22 does not meet the requirements of visual acuity testing. Therefore, an imaging assembly 4 is provided in the optical path to form a virtual image of an optotype of appropriate size, ensuring the accuracy of the detection.

[0051] To achieve the detection of refractive error and uncorrected visual acuity, the imaging component 4 in this application includes a replaceable first imaging component 41 and a second imaging component 42. The first imaging component 41 is used to detect refractive error, and the second imaging component 42 is used to detect uncorrected visual acuity. For ease of replacement, this application provides two interchangeable eyepiece components, which, for ease of understanding, are named eyepiece component A and eyepiece component B, respectively. Eyepiece component A is used to detect refractive error. Figure 4 As shown, the first imaging component 41 includes a support cylinder 411. A first spherical lens 412 is located at one end of the support cylinder 411 near the eye rest 213, and a first light-emitting element 413 is located at the end away from the eye rest 213. Four target display holes are evenly distributed around the circumference of the support cylinder 411, and a first light guide post 414 is provided within each target display hole. The light from the first light-emitting element 413 is guided to the target display holes through the first light guide post 414, illuminating the target. Figure 5 As shown, the second imaging assembly 42 includes a second spherical lens 421 and a second light-emitting element 422, located at the end of the endoscope tube 211 away from the eye rest 213. Four target display holes are evenly distributed along the outer circumference of the second spherical lens 421, and each target display hole contains a second light guide post 423. The light from the second light-emitting element is transmitted through the second light guide posts 423 to the target display holes, illuminating the target.

[0052] Due to hardware limitations, the size of the optotypes directly displayed by the optotype display component 22 does not meet the requirements of visual acuity testing. Therefore, a first spherical lens 412 or a second spherical lens 421 is added to the imaging component. This allows a virtual image of an appropriately sized optotype to be formed between the first spherical lens 412 or the second spherical lens 421 and the optotype display component 22, improving testing accuracy. The first light-emitting element 413 and the second light-emitting element 422 provide backlighting for user observation. In this embodiment, to facilitate switching between refractive error testing and naked-eye visual acuity testing, the eyepiece component 21 is modularly configured as eyepiece component A and eyepiece component B for easy replacement.

[0053] In one possible implementation, the eyerest 213 is magnetically connected to the lifting sleeve 233; the imaging component 21 is magnetically connected to the target display component 22, and the magnetic connection has the advantage of easy replacement. For ease of understanding, this application is described in conjunction with eyepiece assembly A and eyepiece assembly B. (Refer to...) Figure 3Since there are two connection points between the eyepiece assembly 21 and the detection device body (here, the assembly of all components excluding the eyepiece assembly is referred to as the detection device body), one is the connection between the eyerest 213 and the lifting sleeve 233, the purpose of which is to drive the outer tube 212 to extend or retract relative to the inner tube 211 through the lifting sleeve 233; the other is the connection between the bottom of the imaging assembly 21 and the target display assembly 22, the purpose of which is to fix the inner tube 211 relative to the target display assembly 22. In order to facilitate the replacement between the A eyepiece assembly and the B eyepiece assembly, the two connection points in this application adopt magnetic connection to improve the convenience of replacement.

[0054] To achieve a magnetic connection between the eye rest 213 and the lifting sleeve 233, this application specifically provides a first magnetic element 51 at one end of the eye rest 213 near the lifting sleeve 233. The first magnetic element 51 is fixedly connected to the eye rest 213 or the outer lens barrel 212. Since the eye rest 213 and the outer lens barrel 212 are fixedly connected, the first magnetic element 51 can be connected to either the eye rest 213 or the outer lens barrel 212. A second magnetic element 52 is provided at the end of the lifting sleeve 233. The magnetic connection between the eye rest 213 or the outer lens barrel 212 and the lifting sleeve 233 is achieved through the magnetic attraction between the first magnetic element 51 and the second magnetic element 52.

[0055] As an example, a first annular groove is provided at the connection between the eye rest 213 and the outer lens barrel 212. A first magnetic component 51 is fixedly installed in the first annular groove, and a second magnetic component 52 is fixedly installed in the lifting sleeve 233. At this time, the connection between the first magnetic component 51 and the second magnetic component 52 is located in the first annular groove, making the appearance neater.

[0056] To achieve a magnetic connection between the imaging component 21 and the target display component 22, a plurality of third magnetic elements 53 are evenly arranged on the end circumference of the imaging component 21 near the target display component 22. A fourth magnetic element 54 is arranged on the end of the target display component 22 corresponding to the third magnetic elements 53 of the imaging component 21. The magnetic connection between the endoscope tube 211 in the imaging component 21 and the target display component 22 is achieved through the magnetic attraction between the third magnetic elements 53 and the fourth magnetic elements 54.

[0057] Specifically, the number of the third magnetic element 53 and the fourth magnetic element 54 can both be set to four. See also Figure 6 In this embodiment, four targets are evenly distributed around the top circumference of the target display component 22, and four pairs of magnets are correspondingly provided. The four pairs of magnets are spaced apart from the four targets and are evenly distributed along the circumference of the imaging component 21. At this time, the third magnetic element 53 and the fourth magnetic element 54 not only have the function of magnetic connection, but can also automatically align themselves by magnetic force, so that the hole at the bottom of the eyepiece component 21 is automatically aligned with the four targets at the top of the target display component 22.

[0058] In one possible implementation, the visual target display assembly 22 includes a first cylindrical body 221 and a second cylindrical body 222 sleeved together. The first cylindrical body 221 is fixedly connected to the housing 1, and the second cylindrical body 222 is slidably connected to the housing 1. A first display screen 223 is provided on the bottom of the second cylindrical body 222 facing the first cylindrical body 221. The visual target is displayed on the first display screen 223 and imaged by the eyepiece assembly 21. A push-button 224 partially exposed outside the housing 1 is connected to the outside of the second cylindrical body 222. When the push-button 224 is pushed, it causes the second cylindrical body 222 to slide relative to the first cylindrical body 221, thereby changing the distance between the first display screen 223 and the imaging assembly 21, ensuring the accuracy of vision detection.

[0059] In order to accurately identify the position of the second cylinder 222 relative to the first cylinder 221, this application also includes a position identification component. When the second cylinder 222 slides relative to the first cylinder 221, the position identification component monitors the distance between the second cylinder 222 and the first cylinder 221.

[0060] In one possible implementation, the position recognition component includes a position light source plate 225 and a color sensor receiving plate 226. The position light source plate 225 slidably abuts against the second cylinder 222. Alternatively, the position light source plate 225 can directly abut against the second cylinder 222, or it can be fixedly connected to the second cylinder 222 via an intermediate component, allowing it to slidably abut against the position light source plate 225. When the second cylinder 222 slides to different positions, the position light source plate 225 emits different colors. The color sensor receiving plate 226 identifies the colors emitted by the position light source plate 225, thereby determining the position of the second cylinder 222 relative to the first cylinder 221 through system settings.

[0061] To facilitate handheld operation of the vision testing device, the control system of this application includes a second display screen 15, a scroll wheel 16, and function buttons 17 located in the housing 1. As an example, the second display screen 15 shows the menu, testing process, running process, and test result data; the user can select different visual targets by scrolling left or right on the scroll wheel 16; and the function buttons 17 are used for power on / off, function switching, and other operations. In this application, the second display screen 15, scroll wheel 16, and function buttons 17 are all electrically connected to the circuit board of the control system 3; this connection is a standard configuration and will not be described in detail here.

[0062] To improve the ease of use of the vision testing device of this application, a speaker 6 is also provided inside the housing 1 to provide voice prompts, making it convenient for users to operate.

[0063] In addition, regarding this application Figure 6The visual targets shown are explained as follows: The four "E" shapes evenly placed along the circumference are fixed visual targets, and their size and other states do not change during the vision test. The "E" shape in the middle of the four fixed visual targets is a dynamic visual target, emitted by the first display screen 223, and its size, orientation, etc. can be changed through the operating system.

[0064] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0065] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A hand-held vision testing device, characterized by, Includes a housing, and a detection system and a control system disposed within the housing; wherein, The control system is used to control the detection system; The detection system includes an eyepiece assembly and a target display assembly arranged coaxially; the target display assembly is fixedly connected to the housing, and the eyepiece assembly and the target display assembly are detachably connected. The eyepiece assembly includes an inner tube and an outer tube, the inner tube and the outer tube being slidably connected, and an eye rest is provided at the end of the outer tube away from the visual target display assembly; It also includes an adjustment component for driving the outer endoscope tube to slide relative to the inner endoscope tube.

2. The hand-held vision testing device of claim 1, wherein, The adjustment assembly includes a rotating sleeve; the rotating sleeve is rotatably disposed inside the housing, and the rotating sleeve is fixedly connected to a knob, which is exposed on the outside of the housing. It also includes a lifting sleeve, which is disposed between the rotating sleeve and the outer lens tube; the lifting sleeve is connected to the eye rest; The rotating sleeve has a spiral groove on its wall, and a first sliding column fixedly connected to the lifting sleeve is provided in the spiral groove.

3. The hand-held vision testing device of claim 2, wherein, The spiral groove includes a first spiral groove and a second spiral groove; The first spiral groove is slidably connected to the first sliding column; The second spiral groove is slidably connected to the second sliding column; the second sliding column is fixedly connected to the sensing ruler, which is slidably arranged along the axial direction of the rotating sleeve.

4. The hand-held vision testing device of claim 3, wherein, The eyepiece assembly further includes an imaging component, which is disposed within the inner tube of the eyepiece assembly. The imaging assembly includes an interchangeable first imaging assembly and a second imaging assembly; The first imaging component includes a support cylinder, with a first spherical lens at one end of the support cylinder near the eye rest and a first light-emitting element at the other end away from the eye rest. Four visual target display holes are evenly distributed around the circumference of the support cylinder, and a first light guide column is provided inside each visual target display hole. The second imaging component includes a second spherical lens and a second light-emitting element placed at the end of the endoscope tube away from the eye rest, and four target display holes evenly arranged along the outer circumference of the second spherical lens, with a second light guide column provided in each target display hole.

5. The hand-held vision testing device of claim 4, wherein, The eye rest is magnetically connected to the lifting sleeve; the imaging component is magnetically connected to the visual target display component.

6. The hand-held vision testing device of claim 5, wherein, The eye rest is provided with a first magnetic element at one end near the lifting sleeve, and the first magnetic element is fixedly connected to the eye rest or the outer lens barrel. The end of the lifting sleeve is provided with a second magnetic element; The first magnetic component and the second magnetic component are magnetically attracted to each other.

7. The hand-held vision testing device of claim 5, wherein, Multiple third magnetic elements are disposed around the end circumference of the imaging component near the target display component, and a fourth magnetic element is disposed at the end of the target display component corresponding to the third magnetic elements of the imaging component.

8. The hand-held vision testing device of claim 7, wherein, The visual target display assembly includes a first cylindrical body and a second cylindrical body that are sleeved together. The first cylindrical body is fixedly connected to the housing, and the second cylindrical body is slidably connected to the housing. The second cylindrical body is provided with a first display screen facing the bottom of the first cylindrical body. A push-button that is partially exposed outside the housing is connected to the outside of the second cylindrical body. It also includes a position recognition component, which is used to identify the relative position of the second cylinder and the first cylinder.

9. The hand-held vision testing device of claim 8, wherein, The location recognition component includes a location light source board and a color sensor receiver board; The position light source plate slides against the second cylinder. When the second cylinder slides to different positions, the position light source plate emits different colors. The color sensor receiving plate is used to identify the color emitted by the position light source plate.

10. The handheld visual acuity detection device of claim 1, wherein, The control system includes a second display screen, a scroll wheel, and function buttons disposed on the housing.

Images