CN111772571B

CN111772571B - Vision detector

Info

Publication number: CN111772571B
Application number: CN202010610852.8A
Authority: CN
Inventors: 梁季彝; 吴小蝶; 梁嘉濠; 李子华; 梁嘉杰
Original assignee: Jiangmen Polytechnic
Current assignee: Jiangmen Polytechnic
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2023-08-22
Anticipated expiration: 2040-06-30
Also published as: CN111772571A

Abstract

The application relates to a vision detector, which comprises a vision testing device connected with a testing head band and a signal transmitting device; the test head hoop comprises a lens frame, a ranging sensor transmitting module arranged on the lens frame and a lens which is in switching connection with the lens frame; the signal transmitting device comprises a key module and a signal transmitting module which are electrically connected with the first microcontroller; the vision testing device comprises a magnetic suspension base and a sighting mark box suspended above the magnetic suspension base through magnetic force; the sighting mark case comprises a second microcontroller arranged in the case body, a ranging sensor receiving module, a signal receiving module, an LED indicating lamp group and a data transmission module, wherein the ranging sensor receiving module is electrically connected with the second microcontroller. The vision detector provided by the application can improve the vision detection efficiency, reduce the workload of medical staff and meet the actual application demands.

Description

Vision detector

Technical Field

The application relates to the technical field of vision testing equipment, in particular to a vision tester.

Background

Vision refers to the ability of the retina to resolve images. The quality of vision is determined by the size of the retina's ability to resolve images, however, when the refractive medium of the eye (e.g., cornea, lens, vitreous, etc.) becomes turbid or there is refractive error (including myopia, hyperopia, astigmatism, etc.), the vision of the eye is degraded even if the retina functions well. In order to correct and treat the vision of a patient in time effectively, the vision condition of the patient needs to be detected, so that the visual acuity chart is applied.

The visual acuity test chart mainly tests central vision, namely tests central concave visual acuity of a macular area of retina, so that the primary condition of visual functions can be simply and rapidly known, and the visual acuity test chart has important significance for clinical diagnosis and treatment of eye diseases. The light box vision detector is used for measuring a vision chart, and the LED vision detector is a novel light box manufactured according to the principles of energy conservation, low carbon, environmental protection and accurate detection, but the light box vision detector still needs to manually point to a vision target when the vision detector is used for vision detection. However, at present, medical staff is in shortage, and the traditional lamp box vision detector is not only required to be operated by a large amount of manpower, but also has a low speed for such vision detection.

Disclosure of Invention

In order to solve the problems, the application aims to provide a vision detector which can improve vision detection efficiency and reduce the workload of medical staff.

A vision detector comprises a vision testing device connected with a testing head band and a signal transmitting device; the test head hoop comprises a lens frame, a ranging sensor transmitting module arranged on the lens frame and a lens which is in switching connection with the lens frame; the signal transmitting device comprises a key module and a signal transmitting module which are electrically connected with the first microcontroller; the vision testing device comprises a magnetic suspension base and a sighting mark box suspended above the magnetic suspension base through magnetic force; the sighting mark case comprises a second microcontroller arranged in the case body, a ranging sensor receiving module, a signal receiving module, an LED indicating lamp group and a data transmission module, wherein the ranging sensor receiving module is electrically connected with the second microcontroller.

In addition, the vision detector provided by the application can also have the following additional technical characteristics:

further, the signal transmitting module and the signal receiving module are respectively a radio frequency transmitting module and a radio frequency receiving module which can transmit and receive the signals with the frequency of 315MHz or 433 MHz.

Further, the optotype case further comprises a data sending module electrically connected with the second microcontroller, and the magnetic suspension base comprises a third microcontroller arranged in the base body, a data receiving module electrically connected with the third microcontroller and a magnetic suspension module.

Further, the magnetic suspension module is a magnetic suspension coil electrically connected with the third microcontroller or a permanent magnet connected with the controller through a superconducting magnetic suspension motor.

Further, the box includes looking target board and looking target board shell, be equipped with a plurality of through-holes that are used for installing LED pilot lamp group on looking target board, LED pilot lamp group includes grade pilot lamp group and test pilot lamp group, grade pilot lamp group can instruct the grade of current testing, test pilot lamp group can instruct the sighting target of the current required test, grade pilot lamp group is first emitting diode, test pilot lamp group is second emitting diode, second emitting diode is bicolor diode.

Further, when the magnetic suspension module is a magnetic suspension coil, one end of the sighting target plate shell, which is close to the base, is made of a permanent magnet; when the magnetic suspension module is a permanent magnet and a superconducting magnetic suspension motor which are matched, the permanent magnet is fixedly or detachably connected with the sighting mark box.

Further, the sighting target box further comprises a display which is arranged on the sighting target plate and electrically connected with the second microcontroller, wherein the display nixie tube or the display screen is used for displaying the vision value obtained by the user test.

Further, the sighting device box and the magnetic suspension base both comprise a power module, and the power module comprises a charging module connected with a storage battery through a transformer.

Further, the signal transmitting device further comprises a shell for accommodating the first microcontroller, the signal transmitting module and the key module, the shell comprises a bottom shell and a front cover which are connected in a clamped mode, a bearing table is arranged at the edge of the bottom shell, a bearing plate is arranged on the bearing table, the signal transmitting module, the key module, the first microcontroller and the indicating lamp for indicating the state of the signal transmitting device and an anti-slip button matched with the key module are fixedly connected with the upper surface of the bearing plate, and an avoidance hole for avoiding the indicating lamp and the key is formed in the front cover.

Further, when the current test level is three or less optotypes, the next level test can be performed only by judging correctly, otherwise, the previous level test is returned; when the current test level is more than three visual targets, randomly extracting the three visual targets for testing, and correctly judging more than two visual targets for carrying out the next level test, otherwise, returning to the previous level test; and outputting the test result of the level when the test level of the two times is the same level, and enabling the level indicator lamp of the level to display a green light.

The vision detector provided by the application comprises a vision testing device connected with a testing head band and a signal transmitting device; when a user carries a test head band to perform vision test, the left and right deflection angles of the vision mark box are adjusted through the magnetic suspension base according to the distance information measured by the distance sensor transmitting module on the glasses frame and the distance sensor receiving modules arranged on the two sides of the vision mark box by opening lenses of glasses to be tested, so that the vision mark box and the test head band are positioned on the same horizontal line, and the test precision is improved; after the user selects eyes to be tested through the signal transmitting device, the LED lamp group used for testing the sighting target indication and the grade indication on the sighting target box is lightened, and the test result is displayed and uploaded to the cloud after the user tests. The application solves the problem that the existing lamp box vision detector still needs to manually point the optotype when in vision detection, improves the vision detection efficiency, reduces the workload of medical staff and meets the actual application demands.

Drawings

FIG. 1 is a block diagram of a vision detector in a first embodiment of the present application;

FIG. 2 is a schematic view of the structure of the test headband of FIG. 1;

FIG. 3 is a block diagram of the signal transmitting device of FIG. 1;

FIG. 4 is a schematic diagram of the visual testing device in FIG. 1;

FIG. 5 is a side view of FIG. 4;

FIG. 6 is an exploded view of FIG. 4;

FIG. 7 is a block diagram of the magnetic levitation base of FIG. 6;

fig. 8 is a block diagram of the view box of fig. 6.

Description of main reference numerals:

test head hoop	10	Picture frame	11
				Transmitting module of distance measuring sensor	12	Lens	13
Signal transmitting device	20	First microcontroller	21
				Key module	22	Signal transmitting module	23
Vision testing device	30	Magnetic suspension base	31
				Seat body	311	Third microcontroller	312
Data receiving module	313	Magnetic suspension module	314
				View mark box	32	Box body	321
Vision mark board	321a	View standard board shell	321b
				Second microcontroller	322	Ranging sensor receiving module	323
Signal receiving module	324	LED indicator lamp set	325
				Data transmission module	326	Data transmitting module	327

The application will be further described in the following detailed description in conjunction with the above-described figures.

Detailed Description

In order that the objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Several embodiments of the application are presented in the figures. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," "upper," "lower," and the like are used herein for descriptive purposes only and not to indicate or imply that the apparatus or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 8, a vision tester includes a vision testing device 30 connected to a test head band 10 and a signal transmitting device 20.

Further, the test head band 10 includes a frame 11, a ranging sensor transmitting module 12 disposed on the frame 11, and a lens 13 connected to the frame 11. The lens 13 is made of a non-light-transmitting material, the ranging sensor transmitting module 12 can be powered by a built-in battery module, and in this embodiment, the ranging sensor transmitting module 12 is an infrared transmitting module or an ultrasonic ranging sensor.

Specifically, the lens frame 11 may be an eye frame, and a user may select an appropriate lens frame 11 according to actual needs, and turn up the lens 13 that is connected to the lens frame, so that the eye to be tested can see the optotype and the external environment; the distance measuring sensor transmitting module 12 arranged on the mirror frame 11 is used for adjusting the left and right deflection angles of the vision testing device 30 according to the left and right deflection angles of the head of the current user, so that the sight line of the user and the sighting mark are positioned on the same horizontal line, the reflection of light is reduced, and the testing precision is improved. It should be noted that, the inclination angle of the vision testing device 30 is not greater than 5 °, and when the head deflection angle of the user is greater than 5 °, an early warning message is generated to remind the user to adjust his posture. Meanwhile, the ranging sensor transmitting module 12 can also generate a corresponding early warning signal or stop the test when the distance from the user to the vision testing device 30 is tested to be smaller than the preset distance. It will be appreciated that by the arrangement of the test headband 10, the discomfort factor caused by the prior art eye being covered by a wooden scoop, as well as the spread of pathogens, can be avoided.

It can be understood that by adopting ultrasonic ranging to combine with the testing head band and the magnetic suspension technology, the ultrasonic ranging sensor in the center of the head band of the tested person and the ranging receiving sensor in the left and right upper corners of the vision tester are in isosceles triangle states, if the head of the tested person deviates to destroy the ultrasonic isosceles ranging states, the magnetic suspension of the base of the vision tester moves leftwards or rightwards, and the ultrasonic ranging is used for maintaining the two sides of the vision tester to stop moving along with the head band in isosceles triangle, so that the eyes of the tested person and the vision tester are ensured to be in the same straight line, and the measurement influence of the angle on the vision is avoided.

Further, the signal transmitting device 20 includes a key module 22 electrically connected to the first microcontroller 21, a signal transmitting module 23, and a housing for accommodating the first microcontroller 21, the signal transmitting module 23, and the key module 22.

Further, the shell includes drain pan and the protecgulum of looks joint, drain pan edge is equipped with the plummer, be equipped with the loading board on the plummer, signal transmission module 23, button module 22, first microcontroller 21, right signal transmission device 20 carries out the pilot lamp of status indication and with the anti-skidding button of button module 22 complex effect all with the upper surface fixed connection of loading board, be equipped with on the protecgulum be used for right pilot lamp and button are dodged the hole. It will be appreciated that the key module 22 includes a test key for selecting left and right eye tests, an indication key (up, down, left, right) for indicating a video, a switch key, a return key, and the like.

In this embodiment, the bottom shell and the front cover are made of ABS material or PC material, and the bottom shell and the front cover may be clamped by using a clamp spring and a buckle when they are clamped. The signal transmitting module 23 is arranged in the accommodating space formed by the bottom shell and the front cover, and the bottom shell and the front cover are made of ABS material or PC material, so that the portable and attractive signal transmitting device is light and attractive and is convenient to carry. The design of the indicator lamp is convenient for a user to determine the working state of the signal transmitting device 20 according to the state or the color of the indicator lamp in time. The anti-slip button is arranged, so that the situation that a user sweats and slips on the hand and the button is too smooth to slip to cause signal transmission errors can be avoided. It should be noted that, in this embodiment, the signal transmitting module can transmit a radio frequency transmitting module with a frequency of 315MHz or 433MHz, and the specific model of the signal transmitting module can be selected according to actual requirements, which is not limited herein. In addition, in other embodiments, the signal transmitting module 23 may also be a wireless transmitting module with a wireless transmitting chip 2262.

Further, the vision testing device 30 includes a magnetic suspension base 31 and a optotype box 32 suspended above the magnetic suspension base 31 by magnetic force.

Specifically, when a permanent magnet is moved close to the surface of the superconductor, a large gradient of magnetic flux density is formed on the surface of the superconductor because magnetic lines of force cannot enter the superconductor, and a high critical current is induced, so that the permanent magnet is repelled. The repulsive force gradually increases with the decrease of the relative distance, and can overcome the gravity of the superconductor to suspend the superconductor at a certain height above the permanent magnet. When the superconductor moves away from the permanent magnet, a negative magnetic flux density is generated in the superconductor, a reverse critical current is induced, suction force is generated on the permanent magnet, the gravity of the superconductor can be overcome, the superconductor is reversely hung at a certain position below the permanent magnet, and the superconductor is in a mixed state and has incomplete diamagnetism. By using the stereoscopic magnetic field display device, it can be clearly seen that different magnetic field distributions are formed under different polar arrangements, and the different magnetic field distributions change the motion state of the magnetic suspension object.

By utilizing the principle of magnetic suspension floating up and down and motion control (taking steel balls as floating objects)

A. Principle of floating down: the magnetic field generated by the annular (or disk) permanent magnet is uniformly magnetized along the axial direction as a magnetic field source to magnetize the suspended steel ball and the auxiliary steel ball, and the suspended steel ball and the auxiliary steel ball are arranged on the same side of the disk (or disk) permanent magnet and perpendicular to the central axis of the disk (or disk) permanent magnet, so that the suspended steel ball and the auxiliary steel ball have the same magnetization direction. In this case, the ring (or disc) shaped permanent magnet will generate an upward attraction force to the suspended steel ball, and the auxiliary steel ball adjacent to the ring (or disc) shaped permanent magnet will generate a downward repulsive force to the suspended steel ball. When the attractive force and repulsive force acting on the suspended steel ball and the gravity thereof reach balance, the suspended steel ball can be stably suspended in the air. When the ring (or disk) shaped permanent magnet rotates along, the suspended steel balls move in a suspension way.

B. Principle of floating up: the magnetic field generated by uniformly magnetizing the annular permanent magnet along the axial direction is used as a magnetic field source, and the space range of the magnetic field generated by the annular permanent magnet, which is close to the round hole, is downward at the upper part of the magnet, and is upward at the upper part of the magnet. The magnetic field distribution makes the magnetization of the steel ball more complex, and the steel ball can be divided into three areas: 1) When the steel ball is in the upper part of the magnet and approaches the space range of the round hole, the magnetization direction of the steel ball is downward; 2) When the steel ball is in the area of the upper part of the magnet far away from the round hole, the magnetization direction of the steel ball is upward; 3) When the steel ball is arranged at the upper part of the magnet and between the two sections, the suspended steel ball has upward and downward magnetization phenomenon. In the third case, when the downward magnetization component of the steel ball and the upward repulsive force generated by the upward magnetic field of the magnet are balanced with the downward attractive force and gravity generated by the upward magnetization component of the steel ball and the upward magnetic field of the magnet, the upper suspension steel ball is stably suspended in the air, so that the stable upper suspension of the steel ball is realized.

Compared with the traditional vision test, the application is more scientific and convenient, can overcome the dead angle of mechanical movement, can realize the control of left and right without angles, ensures that the head and the tester are always on the same straight line, and can be conveniently disassembled and stored when not used, and the control is more convenient.

Further, the optotype case 32 includes a second microcontroller 322 disposed in the case 321, a ranging sensor receiving module 323 electrically connected to the second microcontroller 322, a signal receiving module 324, an LED indicator set 325, and a data transmitting module 326, where the data transmitting module 326 is a wireless communication module, and can transmit the test result to the user terminal. The data transmission module 326 may be a WiFi module or a bluetooth module, and the ranging sensor transmitting and receiving module is an infrared receiving module.

The case 321 includes a target plate 321a and a target plate housing 321b. The optotype board 321a is provided with a plurality of through holes for installing the LED indicator lamp group 325, the LED indicator lamp group 325 comprises a grade indicator lamp group and a test indicator lamp group, the grade indicator lamp group can indicate the grade to be tested currently, the test indicator lamp group can indicate the optotype to be tested currently, the grade indicator lamp group is a first light-emitting diode, the test indicator lamp group is a second light-emitting diode, and the second light-emitting diode is a bicolor diode.

Specifically, 3 targets were randomly selected for the 1.0 level E measurement initially, and the two-color diode under each target was flashed for 12 seconds at 1 pulse period per second and then the next target was tested. If the determination cannot be made after 12 seconds, the two-color diode is defined as error, and the two-color diode is red, if the visual target E is determined to be correct, the two-color diode is green. When all three optotypes of the current level test are correct, the next level 1.1 test is entered, when one or more optotypes have errors when the next level 1.1 test is entered, the previous level 1.0 measurement is returned, and when all three optotypes of the previous level test are returned, the optotype level lamp of the level is lighted green, that is, the eyesight of a tested person is identified as 1.0 level. The optotype level indicator light is a green monochromatic diode, and the condition that the optotype level light is on is that the level must not appear until the three optotypes E judge that the pair is full.

Further, the data transmission module 326 may be a 326CMT-SVR-200 module, and may send the result of vision detection to the doctor's mobile phone through a lan, and the user may also perform the selection of the left, right, up and down optotypes of the vision apparatus by using the mobile phone, where the doctor only needs to download ebpro 6.03.02-20200213 software to a computer to implement the design of the mobile phone interface, and then upload the software to the CMT-SVR-200 through an Internet network, and then download the control program to the single chip microcomputer through the computer. CMTIWER_V2.9 [ android-china ] _20190612 can be installed on the mobile phone, and the optotype and the feedback qualification rate can be controlled on the mobile phone interface, so that medical workers can be prevented from being directly contacted with patients, and particularly, one of the most effective methods for checking eyesight can be adopted during the transmission of coronaviruses. It can be understood that 3 mobile phones can be simultaneously connected to control or monitor by adopting the internet of things CMT-SVR-200 technology, and doctors can monitor the vision condition of the tested person through the mobile phones and register the measurement result; the testee can scan the two-dimensional code to install the CMT-Viewer and enter the mobile phone control interface to judge up, down, left and right. In addition, if the optotype board is designed to be a front-back optotype test, except for the monitoring and registering result of 1 doctor, the requirement of 2 people on vision test can be met at the same time, and the test efficiency is greatly improved. The device is more suitable for isolation detection of coronavirus epidemic situation, can avoid close contact between a measured person and a doctor, is safer to test, and can also test through a remote controller if the measured visually person does not have a mobile phone.

Further, the optotype case 32 further includes a display disposed on the optotype plate 321a and electrically connected to the second micro 322 controller, and a power module for supplying power to the second micro controller 322, where the power module includes a charging module connected to the storage battery through a transformer, and the display nixie tube or display screen is used for displaying the current vision value of the user.

Further, the optotype case 32 further includes a data transmitting module 327 electrically connected to the second microcontroller 32, and the magnetic suspension base 31 includes a third microcontroller 312 disposed in the base 311, a data receiving module 313 electrically connected to the third microcontroller 312, and a magnetic suspension module 314.

The data transmitting module 327 and the data receiving module 313 may be a GPS module or a 9921A wireless module. The signal receiving module can transmit and receive the radio frequency receiving module with the frequency of 315MHz or 433MHz, the specific model can be selected according to the actual requirement, and the method is not limited. In addition, in other embodiments, the signal transmitting module 23 may also be a wireless transmitting module with a wireless transmitting chip 2262. The magnetic levitation module 314 is a magnetic levitation coil electrically connected with the third microcontroller 312 or a permanent magnet connected with the controller through a superconducting magnetic levitation motor. When the magnetic levitation module 314 is a magnetic levitation coil, the end of the casing of the optotype plate 321a, which is close to the base, is made of a permanent magnet, and the third microcontroller 312 controls the current change rate of the magnetic levitation coil according to the deflection angle of the test head band 10 and the vision testing device 30, which is sent by the data sending module 327 and is received by the data receiving module 313, so that the test head band 10 and the vision testing device 30 are on the same horizontal line, that is, the distance between the ranging sensor transmitting module 12 on the test head band 10 and the ranging sensor receiving modules 323 arranged on two sides of the optotype box 32 is equal; when the magnetic levitation module 314 is a permanent magnet and a superconducting magnetic levitation motor which are in cooperation, the permanent magnet is fixedly or detachably connected with the optotype case 32, at this time, the third microcontroller 312 controls the current change rate of the superconducting magnetic levitation motor according to the deflection angle between the test head band 10 and the vision testing device 30, which is sent by the data sending module 327 and is received by the data receiving module 313, so as to control the change of the magnetic field, so that the permanent magnet fixed with the optotype case 32 deflects left and right, and the test head band 10 and the vision testing device 30 are on the same horizontal line, that is, the distance between the ranging sensor transmitting module 12 on the test head band 10 and the ranging sensor receiving modules 323 arranged on two sides of the optotype case 32 is equal.

It should be noted that, in this embodiment, the first microcontroller 21, the second microcontroller 322, and the third controller are made of a single-chip microcomputer or an MCU, the model of the single-chip microcomputer may be STC12C5a60S2, the magnetic suspension base 31 further includes a power module, and the power module includes a charging module connected with the storage battery through a transformer.

The application provides a vision detector, which comprises a vision testing device connected with a testing head band and a signal transmitting device; when a user carries a test head band to perform vision test, the left and right deflection angles of the vision mark box are adjusted through the magnetic suspension base according to the distance information measured by the distance sensor transmitting module on the glasses frame and the distance sensor receiving modules arranged on the two sides of the vision mark box by opening lenses of glasses to be tested, so that the vision mark box and the test head band are positioned on the same horizontal line, and the test precision is improved; after the user selects eyes to be tested through the signal transmitting device, the LED lamp group used for testing the sighting target indication and the grade indication on the sighting target box is lightened, and the test result is displayed and uploaded to the cloud after the user tests. The application solves the problem that the existing lamp box vision detector still needs to manually point the optotype when in vision detection, improves the vision detection efficiency, reduces the workload of medical staff and meets the actual application demands.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. The vision detector is characterized by comprising a vision testing device connected with a testing head hoop and a signal transmitting device; the test head hoop comprises a lens frame, a ranging sensor transmitting module arranged on the lens frame and a lens which is in switching connection with the lens frame; the distance measurement sensor transmitting module is used for adjusting the left and right deflection angles of the vision testing device according to the left and right deflection angles of the head of the current user, so that the sight of the user and the sighting mark are positioned on the same horizontal line; the system is also used for generating a corresponding early warning signal or stopping the test when the distance from the user to the vision testing device is smaller than the preset distance; the signal transmitting device comprises a key module and a signal transmitting module which are electrically connected with the first microcontroller; the vision testing device comprises a magnetic suspension base and a sighting mark box suspended above the magnetic suspension base through magnetic force; the sighting target box comprises a second microcontroller, a ranging sensor receiving module, a signal receiving module, an LED indicating lamp set and a data transmission module, wherein the second microcontroller is arranged in the box body, the ranging sensor receiving module is electrically connected with the second microcontroller, the ranging sensor receiving module is arranged at two sides of the sighting target box, and the box body comprises a sighting target plate and a sighting target plate shell; the magnetic suspension base comprises a third microcontroller arranged in the base body, a data receiving module and a magnetic suspension module which are electrically connected with the third microcontroller, wherein the magnetic suspension module is a magnetic suspension coil electrically connected with the third microcontroller or a permanent magnet connected with the third microcontroller through a superconducting magnetic suspension motor;

when the magnetic suspension module is a magnetic suspension coil, one end of the optotype plate shell, which is close to the base, is made of a permanent magnet, the third microcontroller controls the current change rate of the magnetic suspension coil according to the deflection angle of the test head hoop and the vision testing device, which is received by the data receiving module, so that the left deflection angle and the right deflection angle of the optotype box are adjusted through the magnetic suspension base, and the test head hoop and the vision testing device are positioned on the same horizontal line, namely the distance between the distance measuring sensor transmitting module on the test head hoop and the distance measuring sensor receiving modules arranged on two sides of the optotype box is equal;

when the magnetic suspension module is a permanent magnet and a superconducting magnetic suspension motor which are matched, the permanent magnet is fixedly or detachably connected with the optotype box, at the moment, the third microcontroller controls the current change rate of the superconducting magnetic suspension motor according to the deflection angle of the test head hoop and the vision testing device received by the data receiving module to control the change of a magnetic field, so that the permanent magnet fixed with the optotype box deflects left and right, and the test head hoop and the vision testing device are positioned on the same horizontal line, namely the distance between the ranging sensor transmitting module on the test head hoop and the ranging sensor receiving modules arranged on two sides of the optotype box is equal.

2. The vision inspection apparatus according to claim 1, wherein the signal transmitting module and the signal receiving module are a radio frequency transmitting module and a radio frequency receiving module capable of transmitting and receiving at 315MHz or 433MHz, respectively.

3. The vision testing apparatus of claim 1, wherein the optotype case further comprises a data transmission module electrically connected to the second microcontroller.

4. The vision tester according to claim 1, wherein the vision target board is provided with a plurality of through holes for installing LED indicator lamp groups, the LED indicator lamp groups comprise a grade indicator lamp group and a test indicator lamp group, the grade indicator lamp group can indicate the grade currently tested, the test indicator lamp group can indicate the vision target currently required to be tested, the grade indicator lamp group is a first light-emitting diode, the test indicator lamp group is a second light-emitting diode, and the second light-emitting diode is a bicolor diode.

5. The vision testing apparatus of claim 1, wherein the optotype case further comprises a display disposed on the optotype plate and electrically connected to the second microcontroller, the display being a digital tube or a display screen, the display being configured to display the vision value obtained from the user's test.

6. A vision inspection apparatus according to claim 3, wherein the vision inspection box and the magnetic levitation base each comprise a power module comprising a charging module connected to a battery via a transformer.

7. The vision detector of claim 1, wherein the signal transmitting device further comprises a housing for accommodating the first microcontroller, the signal transmitting module and the key module, the housing comprises a bottom shell and a front cover which are clamped with each other, a bearing table is arranged at the edge of the bottom shell, a bearing plate is arranged on the bearing table, and the signal transmitting module, the key module, the first microcontroller, an indicator for indicating the state of the signal transmitting device and an anti-slip button matched with the key module are fixedly connected with the upper surface of the bearing plate, and an avoidance hole for avoiding the indicator and the key is formed in the front cover.

8. The vision tester of claim 4, wherein when the current test level is three or less optotypes, all the judgment is correct to enter the next level test, otherwise, the previous level test is returned; when the current test level is more than three visual targets, randomly extracting the three visual targets for testing, and correctly judging more than two visual targets for carrying out the next level test, otherwise, returning to the previous level test; and outputting the test result of the level when the test level of the two times is the same level, and enabling the level indicator lamp of the level to display a green light.