Vision screening system and method

Abstract

The invention discloses a vision screening system and method. The vision screening method comprises the steps that the height difference between pupils of a testee and the center point of vision screening equipment and the distance between the testee and the vision screening equipment are obtained; position adjustment is carried out according to the height difference and the distance, so that the sight line of the testee is perpendicular to the surface of the vision screening equipment, and the distance between the testee and the vision screening equipment is adjusted to a preset distance; starting vision screening equipment, and traversing the plurality of test objects according to a preset sequence; the answer result of the testee is collected and recognized, and the current recognition result is output; judging whether the current identification result of the tester meets a preset condition or not; if yes, ending screening and outputting a vision screening result; and if not, continuing to traverse the next test object until the current identification result of the tester meets the preset condition. Therefore, automation of vision screening can be achieved, and scientificity and credibility of vision screening results are ensured.

Description

Technical Field

[0001] The present invention relates to a vision screening system and also to a corresponding vision screening method, belonging to the technical field of medical devices. Background Art

[0002] A vision tester is an instrument used in places such as ophthalmology hospitals and optical shops to measure vision. It uses sight-mark patterns of different sizes, directions or shapes for the examinee to identify and assess vision. Traditional vision testers are usually equipped with a remote control to adjust the position of the instrument or the display position of the sight mark, and for the examinee to input feedback, such as direction selection, OK or unclear. Based on the results input by the examinee, the instrument obtains the vision measurement result. However, traditional vision testers are relatively simple in function and can only provide the examinee's subjective vision measurement results, which are easily affected by factors such as the examinee's cooperation, attention and understanding of the sight mark, which in turn affects the measurement accuracy.

[0003] While existing vision testers have improved the efficiency and convenience of vision measurement to a certain extent, they still present numerous problems. For one thing, their low level of automation makes it difficult to automatically adjust to the optimal measurement position and conduct objective testing. Furthermore, some instruments have limited measurement accuracy, making it difficult to accurately detect subtle vision changes or specific vision problems, making it difficult to quickly and accurately provide objective vision results. Furthermore, the sight mark patterns used in traditional vision testers are relatively fixed, and long-term use can cause subjects to memorize the sight marks, affecting the accuracy of subsequent measurements. Summary of the Invention

[0004] The primary technical problem to be solved by the present invention is to provide a vision screening system.

[0005] Another technical problem to be solved by the present invention is to provide a vision screening method.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] According to a first aspect of an embodiment of the present invention, there is provided a vision screening system, comprising:

[0008] Vision screening equipment, used to conduct vision screening on test subjects;

[0009] a position identification unit, configured to obtain a height difference between the test subject's pupil and the center point of the vision screening device, and a distance between the test subject's preset point and the center point of the vision screening device;

[0010] A position adjustment unit is connected to the position identification unit and is used to adjust the position of the vision screening device according to the height difference and the distance, so that the line connecting the pupil of the tester and the center point of the vision screening device is perpendicular to the surface of the vision screening device, and the distance is equal to the preset distance.

[0011] Preferably, the vision screening device comprises:

[0012] a display module, configured to traverse a plurality of test objects in a preset order when the vision screening device is activated;

[0013] A data acquisition module, connected to the display module, for collecting the test subject's answer results for the current test object;

[0014] a computing module connected to the data acquisition unit, for identifying the answer result and outputting a current identification result;

[0015] a logic judgment module, connected to the calculation module, for judging whether the current recognition result of the test subject meets the preset conditions; if so, the screening is terminated; if not, the next test object is traversed until the current recognition result of the test subject meets the preset conditions;

[0016] The output module is connected to the logic judgment module to output the vision screening result corresponding to the tester according to the current recognition result of the tester when the current recognition result of the tester meets the preset conditions.

[0017] Preferably, the position adjustment unit at least includes:

[0018] a height adjustment module, connected to the vision screening device and driving the vision screening device to move back and forth in a vertical direction, so as to adjust the height of the vision screening device;

[0019] a distance adjustment module, connected to the vision screening device and driving the vision screening device to move back and forth in a horizontal direction, so as to adjust the distance between the vision screening device and the tester;

[0020] The angle adjustment module is connected to the vision screening device and drives the vision screening device to rotate so as to adjust the angle of the vision screening device.

[0021] According to a second aspect of an embodiment of the present invention, a vision screening method is provided, comprising the following steps:

[0022] Obtaining the height difference between the test subject's pupil and the center point of the vision screening device, and the distance between the test subject's preset point and the center point of the vision screening device;

[0023] Adjusting the position of the vision screening device according to the height difference and the distance so that a line connecting the pupil of the test subject and the center point of the vision screening device is perpendicular to the surface of the vision screening device and the distance is equal to a preset distance;

[0024] Starting the vision screening device and traversing a plurality of test objects in a preset order;

[0025] Collecting the test subject's answer results for the current test object, and identifying the answer results to output a current identification result;

[0026] Determine whether the tester's current recognition result meets the preset conditions;

[0027] If the conditions are met, the screening is terminated and the vision screening result corresponding to the tester is output based on the current recognition result; if the conditions are not met, the next test object is traversed until the current recognition result of the tester meets the preset conditions.

[0028] Preferably, the step of obtaining the height difference between the test subject's pupil and the center point of the vision screening device comprises:

[0029] Performing position identification on the test subject's pupil to obtain the test subject's pupil coordinates in a preset coordinate system;

[0030] Performing position identification on the vision screening device to obtain the center point coordinates of the center point of the vision screening device in the preset coordinate system;

[0031] Based on the pupil coordinates and the center point coordinates, a height difference between the tester's pupil and the center point of the vision screening device is obtained.

[0032] Preferably, the distance between the preset point of the tester and the center point of the vision screening device is obtained by:

[0033] In the preset coordinate system, the shoulder joint node coordinates and elbow joint node coordinates of the left and right arms of the tester are collected respectively;

[0034] Based on the shoulder joint node coordinates and elbow joint node coordinates of the left and right arms of the tester, respectively obtain the center coordinates of the left arm and the center coordinates of the right arm of the tester;

[0035] Based on the coordinates of the center of the left arm and the center of the right arm of the tester, the coordinates of the preset point are obtained; wherein the preset point is the midpoint of the line connecting the center of the left arm and the center of the right arm of the tester;

[0036] Based on the preset point coordinates and the center point coordinates, the distance between the preset point of the tester and the center point of the vision screening device is obtained.

[0037] Preferably, the distance between the preset point of the tester and the center point of the vision screening device is obtained by:

[0038] The midpoint of the line connecting the center of the left arm and the center of the right arm of the tester is used as the preset point of the tester;

[0039] The distance between the preset point and the center point of the vision screening device is measured by an infrared distance measuring device.

[0040] Preferably, the adjusting the position of the vision screening device according to the height difference and the distance at least includes:

[0041] According to the height difference, adjusting the height of the vision screening device or adjusting the angle of the vision screening device so that the line connecting the pupil of the test subject and the center point of the vision screening device is perpendicular to the surface of the vision screening device;

[0042] According to the distance, the vision screening device is adjusted to be closer to or farther away from the tester so that the adjusted distance is equal to the preset distance.

[0043] Preferably, the answer result at least includes key input information or voice information;

[0044] Data processing is performed based on the key input information or voice recognition is performed based on the voice information, thereby outputting the current recognition result of the tester.

[0045] Preferably, the preset distance includes at least a first preset distance and a second preset distance; wherein the first preset distance is not equal to the second preset distance;

[0046] Adjusting the distance between the preset point of the tester and the center point of the vision screening device to a first preset distance to perform vision screening on the tester, and outputting a first vision screening result;

[0047] After the tester completes the vision screening based on the first preset distance, adjusting the distance between the tester's preset point and the center point of the vision screening device to a second preset distance;

[0048] performing a vision screening on the test subject again based on the second preset distance, and outputting a second vision screening result;

[0049] Based on the first vision screening result and the second vision screening result, a final vision screening result of the test subject is comprehensively output.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] (1) The test object is designed in strict accordance with the World Health Organization standards. By identifying and adjusting the position between the user and the vision screening device, not only is the line connecting the test subject's pupil and the center point of the vision screening device perpendicular to the surface of the vision screening device, but the distance between the test subject and the vision screening device is also equal to the preset distance, thereby avoiding the impact of distance error on the screening accuracy. In this way, the scientific nature and credibility of the vision screening results can be ensured.

[0052] (2) It realizes automatic recognition of user responses and intelligent control of the screening process without human intervention, greatly reducing the manpower input of screening and improving screening efficiency, making it suitable for large-scale vision screening. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A schematic structural diagram of a vision screening system provided by the first embodiment of the present invention;

[0054] Figure 2 This is an overall flow chart of a vision screening method provided by the second embodiment of the present invention;

[0055] Figure 3 A detailed flow chart of a vision screening method provided by the second embodiment of the present invention;

[0056] Figure 4 This is a schematic structural diagram of another vision screening system provided in the third embodiment of the present invention. DETAILED DESCRIPTION

[0057] The technical content of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0058] Embodiments of the present invention provide a vision screening system and method designed to address the significant labor costs associated with existing manual screening methods, which require the tester to provide guidance and record responses throughout the entire process. This method automatically adjusts the testing distance based on the tester's height and weight. Once the distance adjustment is complete, the tester undergoes an intelligent vision screening, significantly reducing the labor required for vision assessment and improving assessment efficiency.

[0059] First embodiment

[0060] like Figure 1As shown, the first embodiment of the present invention provides a vision screening system, comprising a position identification unit 1, a position adjustment unit 2, and a vision screening device 3. The position identification unit 1 is used to identify the positions of a test subject and a vision screening device, thereby obtaining the height difference and distance mentioned above. The position adjustment unit 2 is connected to the position identification unit 1 to adjust the position according to the height difference and distance, so that the line connecting the test subject's pupil and the center point of the vision screening device is perpendicular to the surface of the vision screening device, and the distance is equal to a preset distance. The vision screening device 3 is used to perform vision screening on the test subject.

[0061] Specifically, the position identification unit 1 can be implemented in a variety of ways such as RFID (radio frequency identification), infrared positioning or visual positioning, which are not specifically limited here.

[0062] like Figure 1 As shown, the position adjustment unit 2 includes at least a height adjustment module 201, a distance adjustment module 202, and an angle adjustment module 203. The height adjustment module 201 is connected to the vision screening device and drives the vision screening device to move back and forth in the vertical direction to adjust the height of the vision screening device 3. The distance adjustment module 202 is connected to the vision screening device 3 and drives the vision screening device 3 to move back and forth in the horizontal direction to adjust the distance between the vision screening device and the tester. The angle adjustment module 203 is connected to the vision screening device 3 and drives the vision screening device 3 to rotate to adjust the angle of the vision screening device.

[0063] like Figure 1 As shown, the vision screening device 3 includes a display module 301, a data acquisition module 302, a calculation module 303, a logic judgment module 304 and an output module 305. Among them, the display module 301 is used to traverse multiple test objects in a preset order when the vision screening device is started. The data acquisition module 302 is connected to the display module 301 to collect the tester's answer results for the current test object. The calculation module 303 is connected to the data acquisition unit 302 to identify the answer results and output the current recognition result. The logic judgment module 304 is connected to the calculation module 303 to determine whether the tester's current recognition result meets the preset conditions. The output module 305 is connected to the logic judgment module 304 to output the vision screening result corresponding to the tester according to the tester's current recognition result when the tester's current recognition result meets the preset conditions.

[0064] Second embodiment

[0065] like Figure 2 and Figure 3 As shown, a vision screening method provided by the second embodiment of the present invention specifically includes the following steps:

[0066] S1: Acquisition of location information.

[0067] In this embodiment, the vision screening device in the first embodiment is used to screen the test subject's vision. Before the screening, the vision screening device is pre-set in a preset area, and the position of the vision screening device is adjustable (detailed description below). When the user needs to be screened for vision, the user is required to be at a preset distance from the vision screening device (1.5m or 3m in this embodiment, and other distances can also be set). Therefore, in order to ensure the accuracy of the vision screening, it is necessary to perform position detection on the vision screening device and the test subject respectively, so as to obtain the position information of the two, and then accurately control the distance between the two.

[0068] Specifically, in this embodiment, it is necessary to obtain the height difference between the tester's pupil and the center point of the vision screening device, as well as the distance between the tester's preset point and the center point of the vision screening device.

[0069] The following describes how to obtain the height difference and distance:

[0070] (1) Acquisition of height difference

[0071] ① Identify the position of the test subject's pupil to obtain the test subject's pupil coordinates in the preset coordinate system.

[0072] Specifically, in this embodiment, a three-dimensional spatial coordinate system (i.e., a preset coordinate system) is constructed with any point on the ground as the origin, the horizontal direction parallel to the surface of the vision screening device as the X direction, the horizontal direction perpendicular to the surface of the vision screening device as the Y direction, and the vertical direction parallel to the surface of the vision screening device as the Z direction.

[0073] In the preset coordinate system, when it is necessary to perform vision screening on the left eye or right eye of the tester, the position of the corresponding pupil of the tester is identified to obtain the pupil coordinates of the left pupil or the right pupil in the preset coordinate system.

[0074] ② Perform position identification on the vision screening device to obtain the center point coordinates of the center point of the vision screening device in the preset coordinate system.

[0075] Similarly, in the preset coordinate system, the position of the vision screening device is identified to obtain the center point coordinates of the center point of the vision screening device in the preset coordinate system.

[0076] ③ Based on the pupil coordinates and the center point coordinates, obtain the height difference between the test subject's pupil and the center point of the vision screening device.

[0077] The difference between the pupil coordinates and the center point coordinates in the Z direction is calculated to be the height difference between the tester's pupil and the center point of the vision screening device.

[0078] (2) Obtaining distance

[0079] In this embodiment, the distance between the subject and the vision screening device is determined by connecting a predetermined point on the subject with the center point of the vision screening device. The predetermined point is the midpoint of a line connecting the center of the subject's left arm and the center of the subject's right arm. The center of the subject's left arm is the midpoint of a line connecting the shoulder and elbow joints of the subject's left arm. Similarly, the center of the subject's right arm is the midpoint of a line connecting the shoulder and elbow joints of the subject's right arm.

[0080] Thus, in the preset coordinate system, the coordinates of the shoulder and elbow nodes of the test subject's left and right arms are first collected. Then, based on the shoulder and elbow node coordinates of the test subject's left and right arms, the coordinates of the center of the test subject's left and right arms are respectively obtained. Then, based on the center coordinates of the left and right arms, the coordinates of the preset point are obtained. Finally, based on the preset point coordinates and the center point coordinates, the distance between the test subject's preset point and the center point of the vision screening device is obtained.

[0081] Furthermore, in another embodiment, other methods may be used to calculate the distance between the test subject and the vision screening device. For example, the midpoint of the line connecting the center of the test subject's left arm and the center of the right arm is used as the test subject's preset point; then, an infrared distance measuring device is used to measure the distance between the preset point and the center point of the vision screening device.

[0082] S2: Position adjustment.

[0083] After obtaining the height difference and distance based on the above step S1, the position of the vision screening device needs to be adjusted according to the height difference and distance so that the line connecting the tester's pupil and the center point of the vision screening device is perpendicular to the surface of the vision screening device, and the distance is equal to the preset distance.

[0084] Specifically, in this embodiment, the position of the vision screening device is adjusted in the following manner:

[0085] (1) Position adjustment based on height difference

[0086] In this embodiment, the purpose of position adjustment based on the height difference is to make the line connecting the tester's pupil and the center point of the vision screening device perpendicular to the surface of the vision screening device, thereby adapting to testers of different heights and improving the accuracy of the test.

[0087] Specifically, at least the following three methods can be used for adjustment:

[0088] Method 1: Adjust the height of the vision screening equipment.

[0089] By changing the height of the vision screening device, the pupil height of the tester is made the same as the center point height of the vision screening device, so that the tester's line of sight can be perpendicular to the surface of the vision screening device in a level state.

[0090] Method 2: Adjust the angle of the vision screening device.

[0091] By changing the angle of the vision screening device, the tester can keep his or her line of sight perpendicular to the surface of the vision screening device whether looking up or looking down.

[0092] Method 3: Adjust the tester's pupil height.

[0093] By changing the height of the tester, the tester's pupil height is made the same as the center point height of the vision screening device, so that the tester's line of sight can be perpendicular to the surface of the vision screening device in a level state.

[0094] It is understandable that in other embodiments, other methods can also be used to adjust the position, as long as it is ensured that the tester's line of sight is perpendicular to the surface of the vision screening device.

[0095] (2) Adjust according to distance

[0096] In this embodiment, the purpose of performing position adjustment based on the distance is to make the distance between the tester and the vision screening device equal to the preset distance, thereby avoiding affecting the accuracy of the screening due to distance error.

[0097] Specifically, at least the following two methods can be used for adjustment:

[0098] Method 1: Adjust the position of the vision screening equipment.

[0099] Specifically, the vision screening device can be moved back and forth in the Y direction through the ground guide rail, so that the vision screening device can be moved closer to or away from the tester until the distance is adjusted to a preset distance.

[0100] Method 2: Adjust the tester's position.

[0101] Specifically, the ground guide rail enables the tester to move back and forth in the Y direction, so that the tester can move closer to or farther away from the vision screening device until the distance is adjusted to a preset distance.

[0102] It is understandable that in other embodiments, other methods can also be used to adjust the position, as long as the distance between the tester and the vision screening device is equal to the preset distance.

[0103] In this embodiment, the preset distance is set to 1.5m and 3m. The tester can choose 1.5m for vision screening according to needs, or can choose 3m for vision screening, or can perform vision screening at 1.5m and 3m at the same time.

[0104] S3: Perform vision screening on the test subject.

[0105] Specifically, after adjusting the patient's line of sight and the distance between the patient and the vision screening device based on step S2, the vision screening device is started and multiple test objects are traversed in a preset order. In this embodiment, the multiple test objects are all the letter "E", but the font sizes are different, and the direction of the letter is randomly selected from the four directions of up, down, left, and right. When the vision screening device is started, the letter "E" will be presented in order from large to small font size. The user needs to answer the direction of the letter "E" by pressing a button or speaking.

[0106] It is understood that in this embodiment, only one letter "E" appears on the screen of the vision screening device at a time. The next letter "E" appears only after the test subject has answered the question for the current test object. Furthermore, during the test subject's answering process, the device collects the test subject's answer for the current test object in real time, recognizes the answer, and outputs the current recognition result. This recognition result can be judgmental data indicating whether the answer is correct or incorrect, or it can be a periodic summary of the accuracy or error rate of the current test object.

[0107] After the current recognition result is output based on the test subject's answers to the current test object, it is necessary to determine in real time whether the test subject's current recognition result meets the preset conditions. If so, the screening ends and the corresponding vision screening result is output based on the current recognition result. If not, the next test object is traversed until the test subject's current recognition result meets the preset conditions.

[0108] For example, in one embodiment, the correctness of an answer is used as the recognition result. If the current recognition result indicates an incorrect answer, the screening process ends and the corresponding vision screening result for the test subject is output based on the smallest font size that the test subject can correctly read. Otherwise, the character "E" is displayed in a smaller font size until the current recognition result indicates an incorrect answer.

[0109] In another embodiment, the accuracy or error rate of the answer is used as the recognition result. If the current recognition result shows that the accuracy rate is lower than a preset value or the error rate is higher than a preset value, the screening is terminated and the corresponding vision screening result for the test subject is output based on the smallest font size that the test subject can correctly read. Otherwise, the "E" font is displayed in a smaller font size until the current recognition result shows that the accuracy rate is lower than the preset value or the error rate is higher than the preset value.

[0110] S4: Whether to continue to conduct a second vision screening on the test subject.

[0111] It is understandable that, through step S3, a vision screening can be performed on the test subject. In this embodiment, the preset distances include at least a first preset distance (1.5 m) and a second preset distance (3 m).

[0112] Therefore, after the test subject has undergone a vision screening, it is necessary to decide whether to continue with a second vision screening based on the test subject's choice.

[0113] If a second vision screening is not required, the screening process ends. If a second vision screening is required, the user returns to step S1 to re-acquire the position information, adjust the position again, and then proceed with the second vision screening. It is understood that the specific post-screening process for the second vision screening is the same as step S3, with the difference being the distance between the test subject and the vision screening device.

[0114] After the test subject's vision is screened at a first preset distance, a first vision screening result is output. Correspondingly, after the test subject's vision is screened again at a second preset distance, a second vision screening result is output. Based on the first and second vision screening results, a final vision screening result (e.g., an average) is output for the test subject.

[0115] Third embodiment

[0116] like Figure 4 As shown, based on the above-mentioned second embodiment, the third embodiment of the present invention further provides a vision screening system. The vision screening system includes a processor 21 and a memory 22. The memory 22 is coupled to the processor 21 and is configured to store one or more programs. When the programs are executed by the processor 21, the processor 21 implements the vision screening method described in the above embodiment.

[0117] Among them, the processor 21 is used to control the overall operation of the vision screening system to complete all or part of the steps of the above-mentioned vision screening method. The processor 21 can be a central processing unit (CPU), a graphics processing unit (GPU), a field programmable gate array (FPGA), an application-specific integrated circuit (ASIC), a digital signal processing (DSP) chip, etc. The memory 22 is used to store various types of data to support the operation of the vision screening system. These data may include, for example, instructions for any application or method operating on the vision screening system, as well as application-related data. The memory 22 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, etc.

[0118] In an exemplary embodiment, the vision screening system can be implemented as a computer chip or entity, or as a product with certain functions, for executing the vision screening method described above and achieving the same technical effects as the method described above. A typical embodiment is a computer. Specifically, the computer can be, for example, a personal computer, a laptop computer, an in-vehicle human-computer interaction device, a cellular phone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0119] In another exemplary embodiment, the present invention further provides a computer-readable storage medium comprising program instructions. When executed by a processor, the program instructions implement the steps of the vision screening method described in any of the aforementioned embodiments. For example, the computer-readable storage medium may be the aforementioned memory comprising the program instructions, which may be executed by a processor of a vision screening system to perform the aforementioned vision screening method and achieve the same technical effects as the aforementioned method.

[0120] In summary, the vision screening system and method provided by the embodiments of the present invention have the following beneficial effects:

[0121] (1) The test object is designed in strict accordance with the World Health Organization standards. By identifying and adjusting the position between the user and the vision screening device, not only is the line connecting the test subject's pupil and the center point of the vision screening device perpendicular to the surface of the vision screening device, but the distance between the test subject and the vision screening device is also equal to the preset distance, thereby avoiding the impact of distance error on the screening accuracy. In this way, the scientific nature and credibility of the vision screening results can be ensured.

[0122] (2) Without human intervention, it realizes automatic identification of vision screening and intelligent control of the screening process, greatly reducing the manpower input of screening, improving screening efficiency, and is suitable for large-scale vision screening.

[0123] It should be noted that the above embodiments are merely examples, and the technical solutions of the various embodiments may be combined and are all within the scope of protection of the present invention.

[0124] It should be understood that the terms "upper", "lower", "horizontal", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0125] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0126] The vision screening system and method provided by the present invention are described in detail above. For those skilled in the art, any obvious modification made thereto without departing from the essence of the present invention will constitute an infringement of the patent rights of the present invention and will result in the corresponding legal liability.

Claims

1. A vision screening system, characterized in that include: Vision screening equipment, used to conduct vision screening on test subjects; a position identification unit, configured to obtain a height difference between the test subject's pupil and the center point of the vision screening device, and a distance between the test subject's preset point and the center point of the vision screening device; A position adjustment unit is connected to the position identification unit and is used to adjust the position of the vision screening device according to the height difference and the distance, so that the line connecting the pupil of the tester and the center point of the vision screening device is perpendicular to the surface of the vision screening device, and the distance is equal to the preset distance.

2. The vision screening system according to claim 1, wherein The vision screening device comprises: a display module, configured to traverse a plurality of test objects in a preset order when the vision screening device is activated; A data acquisition module, connected to the display module, for collecting the test subject's answer results for the current test object; a computing module connected to the data acquisition unit, for identifying the answer result and outputting a current identification result; a logic judgment module, connected to the calculation module, for judging whether the current recognition result of the test subject meets the preset conditions; if so, the screening is terminated; if not, the next test object is traversed until the current recognition result of the test subject meets the preset conditions; The output module is connected to the logic judgment module to output the vision screening result corresponding to the tester according to the current recognition result of the tester when the current recognition result of the tester meets the preset conditions.

3. The vision screening system according to claim 1, wherein The position adjustment unit at least includes: a height adjustment module, connected to the vision screening device and driving the vision screening device to move back and forth in a vertical direction, so as to adjust the height of the vision screening device; a distance adjustment module, connected to the vision screening device and driving the vision screening device to move back and forth in a horizontal direction, so as to adjust the distance between the vision screening device and the tester; The angle adjustment module is connected to the vision screening device and drives the vision screening device to rotate so as to adjust the angle of the vision screening device.

4. A vision screening method, characterized in that The steps include: Obtaining a height difference between the test subject's pupil and the center point of the vision screening device according to claim 1, and a distance between the test subject's preset point and the center point of the vision screening device; Adjusting the position of the vision screening device according to the height difference and the distance so that a line connecting the pupil of the test subject and the center point of the vision screening device is perpendicular to the surface of the vision screening device and the distance is equal to a preset distance; Starting the vision screening device and traversing a plurality of test objects in a preset order; Collecting the test subject's answer results for the current test object, and identifying the answer results to output a current identification result; Determine whether the tester's current recognition result meets the preset conditions; If satisfied, the screening is terminated and the vision screening result corresponding to the tester is output based on the current recognition result; If not, continue to traverse the next test object until the current recognition result of the tester meets the preset conditions.

5. The vision screening method according to claim 4, wherein The obtaining of the height difference between the test subject's pupil and the center point of the vision screening device specifically includes: Performing position identification on the test subject's pupil to obtain the test subject's pupil coordinates in a preset coordinate system; Performing position identification on the vision screening device to obtain the center point coordinates of the center point of the vision screening device in the preset coordinate system; Based on the pupil coordinates and the center point coordinates, a height difference between the tester's pupil and the center point of the vision screening device is obtained.

6. The vision screening method according to claim 5, wherein The distance between the tester's preset point and the center point of the vision screening device is obtained by: In the preset coordinate system, the shoulder joint node coordinates and elbow joint node coordinates of the left and right arms of the tester are collected respectively; Based on the shoulder joint node coordinates and elbow joint node coordinates of the left and right arms of the tester, respectively obtain the center coordinates of the left arm and the center coordinates of the right arm of the tester; Based on the coordinates of the center of the left arm and the center of the right arm of the tester, the coordinates of the preset point are obtained; wherein the preset point is the midpoint of the line connecting the center of the left arm and the center of the right arm of the tester; Based on the preset point coordinates and the center point coordinates, the distance between the preset point of the tester and the center point of the vision screening device is obtained.

7. The vision screening method according to claim 4, wherein The distance between the tester's preset point and the center point of the vision screening device is obtained by: The midpoint of the line connecting the center of the left arm and the center of the right arm of the tester is used as the preset point of the tester; The distance between the preset point and the center point of the vision screening device is measured by an infrared distance measuring device.

8. The vision screening method according to claim 4, wherein The adjusting the position of the vision screening device according to the height difference and the distance at least comprises: According to the height difference, adjusting the height of the vision screening device or adjusting the angle of the vision screening device so that the line connecting the pupil of the test subject and the center point of the vision screening device is perpendicular to the surface of the vision screening device; According to the distance, the vision screening device is adjusted to be closer to or farther away from the tester so that the adjusted distance is equal to the preset distance.

9. The vision screening method according to claim 4, wherein: The answer result at least includes key input information or voice information; Data processing is performed based on the key input information or voice recognition is performed based on the voice information, thereby outputting the current recognition result of the tester.

10. The vision screening method according to claim 4, wherein: The preset distance includes at least a first preset distance and a second preset distance; wherein the first preset distance is not equal to the second preset distance; Adjusting the distance between the preset point of the tester and the center point of the vision screening device to a first preset distance to perform vision screening on the tester, and outputting a first vision screening result; After the tester completes the vision screening based on the first preset distance, adjusting the distance between the tester's preset point and the center point of the vision screening device to a second preset distance; performing a vision screening on the test subject again based on the second preset distance, and outputting a second vision screening result; Based on the first vision screening result and the second vision screening result, a final vision screening result of the test subject is comprehensively output.

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