Visual chart device, method and system for measuring adjustment amplitude and gathering near points

Abstract

The invention discloses a visual chart device, method and system for measuring adjustment amplitude and gathering near points, and particularly relates to the technical field of medical optical equipment, and the technical key points are as follows: a sighting target display module, which is used for displaying sighting targets based on the size of the sighting targets calculated by a calculation processing module; the distance measuring module is used for measuring the real-time distance between the eyes of the detected person and the sighting mark display module; the calculation processing module is used for responding to the distance recording signal, acquiring the real-time distance measured by the distance measuring module based on the distance recording signal, and calculating to obtain an adjustment amplitude and a set near point; the recording signal input module is used for acquiring a distance recording signal and inputting the distance recording signal into the calculation processing module; acquiring a distance recording signal input by the detected person, and recording a real-time distance measured by the distance measuring module at the current moment based on the distance recording signal; and calculating the adjustment amplitude and the set near point by using the real-time distance measured at the current moment.

Description

Technical Field

[0001] This invention relates to the field of medical optical equipment technology, specifically to a visual acuity chart device, method, and system for measuring accommodation amplitude and convergence near point. Background Technology

[0002] Accommodative amplitude (AMP) is the maximum accommodative capacity that the eye's accommodation system can utilize; near point of convergence (NPC) is the closest distance at which binocular single vision can be maintained when both eyes are focused on a near object. These two indicators are commonly used to assess monocular and binocular vision function, and are relevant to ophthalmological and optometric diseases such as myopia control, visual impairment, presbyopia, and strabismus.

[0003] Currently, there are two methods for measuring accommodative amplitude. The first is the negative lens method, which requires the use of a large comprehensive optometry instrument to gradually add negative lenses in front of the eyes. The second is the near-far method, where, under refractive correction, the fixation target (hereinafter referred to as the optotype) is gradually moved closer to the eyes until the examinee perceives the optotype as changing from clear to persistently blurred. The distance between the optotype and the eyes at this point is the near point of accommodation, and the reciprocal of the near point of accommodation (meters) is the accommodative amplitude. The near point of convergence is measured using the near-far method, where the optotype is gradually moved closer to both eyes until the examinee perceives the optotype as changing from one to two, or the examiner observes that the examinee no longer converges. The distance between the optotype and the eye plane at this point is the near point of convergence.

[0004] Accommodation amplitude (near-far method) and convergence near point both require measuring the distance from the target to the eye. Currently, the commonly used tool in clinical and research settings is the near-field scale rod, which can be used in conjunction with a phoropter (such as the patented technology solution with announcement number CN209474584U) or alone with a forehead rest (such as the patented technology solution with announcement number CN203539327U). However, when using the above-mentioned existing technology alone, one hand needs to hold the near-field rod, the other hand moves the target, and the other hand covers one eye of the subject or prepares other covering methods in advance, increasing the difficulty of operation; at the same time, as the target moves closer, the subject subjectively feels that the visual angle of the target increases and it is easier to see clearly, resulting in a measured accommodation amplitude that is larger than the actual value, leading to measurement errors.

[0005] Therefore, the present invention aims to provide a visual acuity chart device, method, and system for measuring accommodation amplitude and convergence near point, in order to solve the aforementioned related problems. Summary of the Invention

[0006] The technical problem to be solved by this invention is that existing technologies are complex to operate and have measurement errors. The aim is to provide a vision chart device, method, and system for measuring accommodation amplitude and convergence near point. The measuring device provided by this invention is portable and can be used by the person being tested with one hand, eliminating the need for a near point scale rod or guide rail, making it suitable for various occasions. By acquiring the real-time distance between the measuring device and the person being tested, the size of the visual target is compensated in real time to ensure that the visual target angle remains unchanged during the measurement process, thereby enabling detection at different handheld distances. Simultaneously, by compensating for the lateral and depth of the real-time distance, the impact of hand shake on the real-time distance acquisition is reduced.

[0007] This invention is achieved through the following technical solution:

[0008] A visual acuity chart device for measuring accommodation amplitude and convergence near point, the device comprising:

[0009] A target display module, which is used to display a target based on the target size calculated by the calculation processing module;

[0010] The ranging module is used to measure the real-time distance between the eyes of the person being tested and the visual target display module;

[0011] The calculation and processing module is used to respond to the distance recording signal, and to obtain the real-time distance measured by the ranging module based on the distance recording signal, and to calculate the adjustment range and the convergence point;

[0012] The recording signal input module is used to acquire the distance recording signal and input the distance recording signal into the calculation and processing module.

[0013] Furthermore, the device also includes:

[0014] The results display module is used to display the calculated adjustment range and ensemble near point;

[0015] An image acquisition module is used to acquire facial images of the person being tested.

[0016] Furthermore, the ranging module employs an infrared ranging sensor.

[0017] The present invention also provides a method for measuring accommodation amplitude and convergence near point, the method being used in a visual acuity chart device for measuring accommodation amplitude and convergence near point as described in any one of the preceding claims, the method comprising:

[0018] Acquire the distance recording signal and record the real-time distance measured by the ranging module at the current moment based on the distance recording signal;

[0019] The adjustment range and convergence point are calculated using the real-time distance measured at the current moment.

[0020] Furthermore, after recording the real-time distance measured by the ranging module at the current moment based on the distance recording signal, the method also includes:

[0021] Obtain the coordinate pairs of the pupil center positions of the tested person at adjacent time points and calculate the pupil displacement; use the pupil displacement to perform lateral displacement compensation on the real-time distance to obtain the laterally compensated real-time distance.

[0022] The real-time distance difference after lateral compensation at adjacent time points is obtained. When the real-time distance difference meets the preset abnormal depth condition, displacement depth compensation is performed on the real-time distance after lateral compensation to obtain the real-time distance after depth compensation.

[0023] Furthermore, the method also includes:

[0024] The real-time distance measured by the ranging module is obtained, and the length of the target is calculated by combining the real-time distance with the target's viewing angle.

[0025] The present invention also provides a system for measuring accommodation amplitude and convergence near point, the system being used in any of the methods for measuring accommodation amplitude and convergence near point described above, the system comprising:

[0026] The real-time distance recording module is used to acquire the distance recording signal and record the real-time distance measured by the ranging module at the current moment based on the distance recording signal.

[0027] The adjustment range calculation module is used to calculate the adjustment range and the ensemble nearest point using the real-time distance measured at the current moment.

[0028] The present invention also provides a computer device, including a system memory and a processor, wherein the system memory stores a computer program, and the processor executes the computer program to implement the steps of any of the methods described above.

[0029] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any of the methods described above.

[0030] The present invention also provides a computer program product containing instructions that, when executed by a cluster of computer devices, cause the cluster of computer devices to perform the method described in any of the preceding claims.

[0031] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0032] Specifically, in this embodiment, the measuring device provided by the present invention can be carried by hand and the person being tested can hold it with one hand, without the need for a near-point scale rod or guide rail, making it suitable for various occasions; by acquiring the distance measurement module to measure the real-time distance between the person being tested and the measuring device, the size of the target is adjusted and compensated in real time to ensure that the target viewing angle remains unchanged during the measurement process, thereby realizing the detection of different hand-held distances; at the same time, by compensating and correcting the lateral and depth of the real-time distance, the influence of hand-held shaking on the real-time distance acquisition is reduced. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0034] Figure 1 This is a frontal view of a visual acuity chart device for measuring accommodation amplitude and convergence near point in this embodiment;

[0035] Figure 2 This is a schematic diagram of the structure of a visual acuity chart device for measuring accommodation amplitude and convergence near point in this embodiment;

[0036] Figure 3 This is a flowchart illustrating a method for measuring adjustment amplitude and convergence proximity in this embodiment;

[0037] Figure 4 This is a schematic diagram of the module connections of a system for measuring adjustment amplitude and convergence proximity in this embodiment;

[0038] Figure 5 This is a schematic diagram of the structure of a computer device in this embodiment.

[0039] The attached diagram shows the markings and corresponding component names:

[0040] 1. Target display module; 2. Distance measurement module; 3. Calculation and processing module; 4. Recording signal input module; 5. Result display module; 6. Image acquisition module. Detailed Implementation

[0041] The exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments to aid understanding, and should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0042] In this disclosure, unless otherwise stated, the use of terms such as "first," "second," etc., to describe various elements is not intended to limit the positional, temporal, or importance relationships of these elements; such terms are merely used to distinguish one element from another. In some examples, the first element and the second element may refer to the same instance of that element, while in other cases, based on the context, they may refer to different instances.

[0043] The terminology used in the description of the various examples in this disclosure is for the purpose of describing particular examples only and is not intended to be limiting. Unless the context explicitly indicates otherwise, an element may be one or more unless the number of elements is specifically limited. Furthermore, the term "and / or" as used in this disclosure covers any one of the listed items and all possible combinations thereof.

[0044] Example 1

[0045] See Figures 1-2 , Figure 1 A frontal view schematic diagram of a vision chart device for measuring accommodation amplitude and convergence near point is shown. Figure 2 A schematic diagram of a visual acuity chart device for measuring accommodation amplitude and convergence near point is shown, wherein the device includes:

[0046] A target display module 1 is used to display a target based on the target size calculated by the calculation and processing module 3.

[0047] Distance measuring module 2, which is used to measure the real-time distance between the eyes of the person being tested and the visual target display module 1;

[0048] The calculation and processing module 3 is used to respond to the distance recording signal, and to obtain the real-time distance measured by the distance measuring module 2 based on the distance recording signal, and to calculate the adjustment range and the convergence point;

[0049] The recording signal input module 4 is used to acquire the distance recording signal and input the distance recording signal into the calculation and processing module 3.

[0050] Specifically, in this embodiment, the visual target display module 1 uses an electronic display screen to facilitate vision testing for the tested personnel by displaying visual targets in real time; the ranging module 2 uses an infrared ranging sensor to continuously acquire the real-time distance between the visual target display module 1 and the eyes of the tested personnel, so as to calculate the accommodation amplitude and convergence near point; the calculation and processing module 3 uses an existing terminal processor to acquire the real-time distance measured by the ranging module 2 by responding to the distance recording signal input by the recording signal input module 4, and then calculates the accommodation amplitude and convergence near point.

[0051] Meanwhile, the recording signal input module can use either voice input or key input. The distance recording signal for voice input is a voice control signal, and the distance recording signal for key input is a key control signal. In this embodiment, key input is used. Furthermore, key input can be input by the inspector or the inspected person, and no further restrictions are imposed here.

[0052] It should also be noted that the vision chart device provided in this embodiment can also be used to measure near vision; since the present invention can adjust the size of the optotype in real time according to the real-time distance of the examination, it can measure near vision more accurately.

[0053] In another embodiment, the device further includes a result display module 5, which is used to display the calculated adjustment range and the convergence near point;

[0054] Image acquisition module 6, which is used to acquire facial images of the person being tested.

[0055] Specifically, in this embodiment, the result display module 5 uses an electronic display screen to display the adjustment range and convergence near point calculated by the calculation and processing module 3 in real time; the image acquisition module 6 uses a high-definition camera to acquire facial images of the person being tested, so as to acquire the center position of the pupil of the person being tested.

[0056] In this embodiment, see also Figure 3 , Figure 3 A flowchart illustrating a method for measuring accommodation amplitude and convergence near point is shown. This method is used in a visual acuity chart device for measuring accommodation amplitude and convergence near point as described in any of the preceding claims. The method includes:

[0057] S1: Acquire the distance recording signal and record the real-time distance measured by the ranging module 2 at the current moment based on the distance recording signal;

[0058] Specifically, in this embodiment, when the person being tested moves the measuring device horizontally towards their eyes along the line of sight and reaches the nearest blurry point, a distance recording signal of "stop detection" will be input. After the recording signal input module 4 collects the distance recording signal, it outputs it to the calculation and processing module 3. The calculation and processing module 3 responds to the distance recording signal and records the real-time distance measured by the distance measuring module 2 at this time.

[0059] S2: Calculate the adjustment range and convergence point using the real-time distance measured at the current moment.

[0060] Specifically, in this embodiment, after obtaining the real-time distance measured at the current moment, the adjustment range is calculated using the following formula: , Indicates the adjustment range. Indicates the nearest point distance. , Indicates real-time distance. This indicates the far point distance. If the subject is in a state of emmetropia or fully corrected refractive error, the far point is... At infinity; the real-time distance that satisfies the measurement of the convergence near point endpoint is the convergence near point; the final adjustment amplitude (AMP) result is displayed in diopter (D), and the convergence near point (NPC) result is displayed in distance (cm).

[0061] Furthermore, after recording the real-time distance measured by the ranging module 2 at the current moment based on the distance recording signal, the method further includes:

[0062] Obtain the coordinate pairs of the pupil center positions of the tested person at adjacent time points and calculate the pupil displacement; use the pupil displacement to perform lateral displacement compensation on the real-time distance to obtain the laterally compensated real-time distance.

[0063] The real-time distance difference after lateral compensation at adjacent time points is obtained. When the real-time distance difference meets the preset abnormal depth condition, displacement depth compensation is performed on the real-time distance after lateral compensation to obtain the real-time distance after depth compensation.

[0064] Specifically, in this embodiment, facial images of the person being tested are acquired at adjacent time points, and the coordinate pairs of the pupil center position in each facial image are obtained. These coordinate pairs include the horizontal coordinate and the vertical coordinate of the pupil center position. Then, the pupil displacement between multiple coordinate pairs is calculated, and the pupil displacement is converted into angular changes. Specifically: In the formula, This indicates the horizontal displacement of the pupil. This indicates the vertical displacement of the pupil. This represents the horizontal coordinate of the current pupil center position. This represents the horizontal coordinate of the pupil center position at the previous moment. Indicates the focal length of a high-definition camera; This represents the vertical coordinate of the pupil center position at the current moment. This represents the vertical coordinate of the pupil center position at the previous moment. This represents the pupil displacement; finally, compensation is applied to the real-time distance, and the compensated real-time distance is as follows: .

[0065] In addition, this embodiment also includes real-time distance compensation for depth-direction swaying. When the real-time distance collected at adjacent times exceeds a preset abnormal movement threshold, the real-time distance is smoothed as follows: When the real-time distance collected at adjacent time points does not exceed the preset motion anomaly threshold, the real-time distance is smoothed as follows: .

[0066] Furthermore, the method also includes:

[0067] The real-time distance measured by the ranging module 2 is obtained, and the length of the target is calculated by combining the real-time distance with the target's viewing angle.

[0068] It should be noted that in this embodiment, based on the standard visual acuity chart design, the angular value (unit: radians rad) of one detail corresponding to different visual acuity VAs is as follows: For example, the angular value θ(1.0) of one detail of the optotype corresponding to decimal visual acuity 1.0 is approximately 0.000291 rad. The length and width of the 1.0 optotype are both 5 details, that is, each with an angular value of 0.001455 rad. After obtaining the real-time distance, the optotype length is calculated by combining it with the optotype angular value, specifically: ,in, Indicates the viewpoint of the target. Indicates the length of the target.

[0069] Specifically, in this embodiment, the measuring device provided by the present invention can be carried by the person being tested and can be used by holding it with one hand, without the need for a near-point scale rod or guide rail, making it suitable for various occasions. By acquiring the real-time distance between the measuring device and the person being tested through the distance measuring module, the size of the target is adjusted and compensated in real time to ensure that the target viewing angle remains unchanged during the measurement process, thereby enabling the detection of different handheld distances. At the same time, by compensating and correcting the lateral and depth of the real-time distance, the impact of handheld shaking on the real-time distance acquisition is reduced.

[0070] Example 2

[0071] See Figure 4 The present invention also provides a system for measuring accommodation amplitude and convergence near point, the system being used in any of the methods for measuring accommodation amplitude and convergence near point described above, the system comprising:

[0072] The real-time distance recording module 100 is used to acquire the distance recording signal and record the real-time distance measured by the ranging module at the current moment based on the distance recording signal;

[0073] The adjustment range calculation module 200 is used to calculate the adjustment range and the convergence point using the real-time distance measured at the current moment.

[0074] It should be noted that the modules in the system of Embodiment 2 correspond to the steps in the method of Embodiment 1. The steps in the method of Embodiment 1 have been described in detail in Embodiment 1, and the module content in the system will not be described in detail in this Embodiment 2.

[0075] Example 3

[0076] See Figure 5 This embodiment also provides a computer device, including a system memory 1005 and a processor 1001. The system memory 1005 stores a computer program, and the processor 1001 executes the computer program to implement the steps of any of the methods described above.

[0077] It should be noted that the processor 1001 is used to execute the steps in the above method embodiments according to the instructions in the program code. Alternatively, when the processor 1001 executes the computer program, it implements the functions of each module / unit in the above system / device embodiments.

[0078] Specifically, in this embodiment, the computer program can be divided into one or more modules / units, which are stored in the system memory 1005 and executed by the processor 1001 to complete this application. The one or more modules / units can be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program in the terminal device.

[0079] The terminal device can be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor 1001 and a system memory 1005. Those skilled in the art will understand that this does not constitute a limitation on the terminal device; it may include more or fewer components than shown in the figures, or a combination of certain components, or different components. For example, the terminal device may also include an input / output device 1003, a network access device 1002, a bus 1006, etc.

[0080] The processor 1001 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0081] System memory 1005 can be an internal storage unit of the terminal device, such as a hard drive or RAM. System memory 1005 can also be a storage device 1004 of the terminal device, such as an external hard drive, SmartMedia Card (SMC), Secure Digital (SD) card, or FlashCard. Furthermore, system memory 1005 can include both internal storage units and storage device 1004. System memory 1005 is used to store computer programs and other programs and data required by the terminal device. System memory 1005 can also be used to temporarily store data that has been output or will be output.

[0082] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0083] Example 4

[0084] This embodiment provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described above.

[0085] The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), registers, hard disks, optical fibers, compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof, or any other form of computer-readable storage medium in the art.

[0086] An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and storage medium can reside within an application-specific integrated circuit (ASIC). In embodiments of the invention, the computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device.

[0087] Example 5

[0088] This embodiment also provides a computer program product containing instructions that, when executed by a cluster of computer devices, cause the cluster of computer devices to perform the method described in Embodiment 1.

[0089] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A visual acuity chart device for measuring accommodation amplitude and convergence near point, characterized in that, The device includes: A target display module, which is used to display a target based on the target size calculated by the calculation processing module; The ranging module is used to measure the real-time distance between the eyes of the person being tested and the visual target display module; The calculation and processing module is used to respond to the distance recording signal, and to obtain the real-time distance measured by the ranging module based on the distance recording signal, and to calculate the adjustment range and the convergence point; The recording signal input module is used to acquire the distance recording signal and input the distance recording signal into the calculation and processing module.

2. The visual acuity chart device for measuring accommodation amplitude and convergence near point according to claim 1, characterized in that, The device further includes: The results display module is used to display the calculated adjustment range and ensemble near point; An image acquisition module is used to acquire facial images of the person being tested.

3. The visual acuity chart device for measuring accommodation amplitude and convergence near point according to claim 1, characterized in that, The ranging module uses an infrared ranging sensor.

4. A method for measuring adjustment amplitude and convergence near point, characterized in that, This method is used in the apparatus for measuring adjustment amplitude and convergence proximity as described in any one of claims 1-3, the method comprising: Acquire the distance recording signal and record the real-time distance measured by the ranging module at the current moment based on the distance recording signal; The adjustment range and convergence point are calculated using the real-time distance measured at the current moment.

5. The method for measuring adjustment amplitude and convergence proximity point according to claim 4, characterized in that, After recording the real-time distance measured by the ranging module at the current moment based on the distance recording signal, the method further includes: Obtain the coordinate pairs of the pupil center positions of the tested person at adjacent time points and calculate the pupil displacement; use the pupil displacement to perform lateral displacement compensation on the real-time distance to obtain the laterally compensated real-time distance. The real-time distance difference after lateral compensation at adjacent time points is obtained. When the real-time distance difference meets the preset abnormal depth condition, displacement depth compensation is performed on the real-time distance after lateral compensation to obtain the real-time distance after depth compensation.

6. The method for measuring adjustment amplitude and convergence proximity point according to claim 3, characterized in that, The method also includes: The real-time distance measured by the ranging module is obtained, and the length of the target is calculated by combining the real-time distance with the target's viewing angle.

7. A system for measuring adjustment amplitude and convergence proximity, characterized in that, The system is used in a method for measuring adjustment amplitude and convergence near point as described in any one of claims 4-6, the system comprising: The real-time distance recording module is used to acquire the distance recording signal and record the real-time distance measured by the ranging module at the current moment based on the distance recording signal. The adjustment range calculation module is used to calculate the adjustment range and the ensemble nearest point using the real-time distance measured at the current moment.

8. A computer device comprising a system memory and a processor, wherein the system memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 4 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method described in any one of claims 4 to 6.

10. A computer program product containing instructions, characterized in that, When the instructions are executed by a cluster of computer devices, the cluster of computer devices causes the cluster of computer devices to perform the method as described in any one of claims 4 to 6.

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