CN112741591B - Vision detection device and vision detection method - Google Patents
Vision detection device and vision detection method Download PDFInfo
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- CN112741591B CN112741591B CN202110048859.XA CN202110048859A CN112741591B CN 112741591 B CN112741591 B CN 112741591B CN 202110048859 A CN202110048859 A CN 202110048859A CN 112741591 B CN112741591 B CN 112741591B
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- 230000004438 eyesight Effects 0.000 title claims abstract description 148
- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 106
- 239000004020 conductor Substances 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 31
- 230000005484 gravity Effects 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 230000000007 visual effect Effects 0.000 claims description 10
- 230000002265 prevention Effects 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000008093 supporting effect Effects 0.000 abstract description 3
- 230000004304 visual acuity Effects 0.000 description 15
- 238000012937 correction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005286 illumination Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 206010012689 Diabetic retinopathy Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 238000003702 image correction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
- A61B3/028—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing visual acuity; for determination of refraction, e.g. phoropters
- A61B3/032—Devices for presenting test symbols or characters, e.g. test chart projectors
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Abstract
The invention discloses a vision testing device and a vision testing method, wherein the device is provided with a cylinder body and a connecting part, one end of the cylinder body is provided with an ocular, and the end is suitable for being attached to eyes; a view finding frame is arranged at the other end below the cylinder body, at least three conductor points are arranged on the bottom layer edge of the view finding frame, and the gravity centers of the three conductor points are coincident with the center of the view finding frame; at least two pairs of plane mirrors are arranged in the cylinder body, the plane mirrors and the horizontal plane form an angle of 45 degrees, and the mirror surfaces of each pair of plane mirrors are opposite and form an angle of 90 degrees; the connecting component is used for fixing the cylinder body on an intelligent terminal, and the view finding frame is attached to a screen of the intelligent terminal; the total length of the cylinder is equal to the specified distance of vision measurement. The invention can perform vision detection at any time and any place at low cost, and the detection process standard can realize accurate vision detection, thereby playing a good supporting role in vision management (including prevention, control and monitoring).
Description
Technical Field
The invention relates to the technical field of vision optical instruments and vision optometry, in particular to a vision testing device and a vision testing method.
Background
Most of the prior vision testing tests are carried out by using the vision chart in the environments of fixed places, large space and standard brightness of the vision chart, and are generally carried out in places such as hospitals, spectacle stores and the like. Because the vision detection needs to be specially carried out at a fixed place, the vision detection is carried out when people feel that the vision possibly has problems, and the passive detection leads to the problem that the vision is not treated but cannot be prevented and controlled in advance. If vision testing is not limited to a specific environment or facility, but can perform self-testing anytime and anywhere, the vision testing is a very beneficial support in terms of vision protection and vision problem prevention and control.
Disclosure of Invention
The present invention has been made in view of the above problems, and it is an object of the present invention to provide a solution to overcome or at least partially solve the above problems. Accordingly, in one aspect of the present invention, there is provided a vision testing device having a barrel with an eyepiece disposed at one end thereof, the end being adapted to conform to the eye; a view finding frame is arranged at the other end below the cylinder body, at least three conductor points are arranged on the bottom layer edge of the view finding frame, and the gravity centers of the three conductor points are coincident with the center of the view finding frame; at least two pairs of plane mirrors are arranged in the cylinder body, the plane mirrors and the horizontal plane form an angle of 45 degrees, and the mirror surfaces of each pair of plane mirrors are opposite and form an angle of 90 degrees; the connecting component is used for fixing the cylinder body on an intelligent terminal, and the view finding frame is attached to a screen of the intelligent terminal; the total length of the cylinder is equal to the specified distance of vision measurement.
Optionally, the cylinder is telescopic.
Optionally, the eyepiece is a predetermined distance away from one end of the cylinder, and one end of the cylinder is trumpet-shaped.
Optionally, the three conductor points form an isosceles triangle.
Optionally, the three conductor points form an equilateral triangle.
Optionally, the plane mirror is a surface mirror.
The invention also provides a vision testing method based on the vision testing device, which is executed by the intelligent terminal and comprises the following steps:
Detecting position information of the at least three conductor point contact screens;
determining a display position of the optotype image based on the position information;
sequentially displaying the optotype images corresponding to the vision values according to the determined display positions;
Receiving user input;
Analyzing whether the user input is matched with the attribute of the displayed sighting target image, if so, considering that the test is correct, otherwise, considering that the test is wrong; and determining the vision value according to the test result corresponding to each vision value.
Optionally, determining the display position of the optotype image based on the position information includes:
Determining a first matching point and a matching line according to the position information of the three conductor point contact screens;
calibrating a reference point display position of the sighting target image based on the first matching point, and storing reference point information and reference line information of the sighting target image corresponding to the sighting target image;
correcting the display position of the datum line of the sighting target image according to the matching line;
and displaying the prestored sighting target images in sequence according to the datum point display position and the datum line display position.
Alternatively, the optotype images are displayed from low to high vision values, and a predetermined number of optotype images are displayed for each vision value.
Optionally, the first optotype image is displayed according to a user input.
Optionally, the displayed first optotype image is the optotype image corresponding to the lowest vision value.
Optionally, if the number of times of testing correctness reaches a predetermined threshold, controlling to display an optotype image corresponding to a second vision value, wherein the second vision value is higher than the first vision value, repeating until the number of times of testing errors reaches the predetermined threshold, and outputting the vision value corresponding to the previous time.
Optionally, if the number of times of testing errors reaches a predetermined threshold, controlling to display an optotype image corresponding to a second vision value, where the second vision value is lower than the first vision value, repeating until the number of times of testing errors reaches the predetermined threshold, and outputting the corresponding vision value.
Optionally, position information of four conductor points is collected, and a center display position of the optotype image is determined based on the position information of the four conductor points.
The technical scheme provided by the application has at least the following technical effects or advantages: the vision detection device is convenient to carry, can perform vision detection at any time and any place at low cost by combining with a widely used intelligent terminal to run corresponding application programs, can realize accurate vision detection according to detection process standards, and plays a good supporting role in vision management (including prevention, control and monitoring).
The foregoing description is only an overview of the technical solutions of the present invention, and may be implemented according to the content of the specification in order to make the technical means of the present invention more clearly understood, and in order to make the technical solutions of the present invention and the objects, features and advantages thereof more clearly understood, the following specific embodiments of the present invention will be specifically described.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a perspective view showing a vision testing device according to a first embodiment of the present invention;
Fig. 2 is a cross-sectional view showing a vision testing device according to a first embodiment of the present invention;
fig. 3 shows a side view of a vision testing device according to a first embodiment of the present invention;
fig. 4 is a light path diagram of a vision testing device according to a second embodiment of the present invention;
FIG. 5 shows a process of the intelligent terminal performing optotype image correction and display based on the vision testing device;
Fig. 6 shows a process of vision testing using the vision testing apparatus of the present invention in combination with an intelligent terminal.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The visual acuity test chart is specified in the 'visual acuity test technical operation Specification', and the visual acuity test chart can be a logarithmic visual acuity test chart, an international standard visual acuity test chart and an ETDRS (early treatment diabetic retinopathy research) visual acuity test chart, wherein the test distance of the first two visual acuity test charts is 5m, and the test distance of the second visual acuity test chart is 4m, so that the existing visual acuity test requires a wide physical space. In the "technical operation Specification for visual inspection", 1.0 line of the visual chart should be the same height as the eye to be inspected, however, the general visual chart is fixed on the wall, and the heights of the tested persons are different, the gap is larger, and in the actual visual inspection, the requirement is difficult to meet. The visual acuity test technical operation standard requires that the illumination of the visual acuity test chart is uniform and has no glare, and if the illumination is manually illuminated, the illumination intensity is 300-500lux, but it is quite common at present to perform visual acuity test by using some paper visual acuity test charts sold in the market in one place, especially in a commercial activity place of visual acuity products or vision related products, and the test result is quite easy to be inaccurate due to the fact that the illumination intensity is not tested.
The invention aims to meet the above specifications, and provides a device and a method which are not limited by physical space and can conveniently and accurately detect eyesight. The vision testing apparatus provided by the present invention is a stand-alone product or device. When vision detection is performed, the vision detection device needs to be matched with an app running on the intelligent terminal. The intelligent terminal can provide stable optotype image backlight brightness and optotype patterns meeting the requirements.
In one aspect of the present invention, there is provided a vision testing device, as shown in fig. 1-3, having a barrel 1 and a connecting member 2, the barrel 1 being provided at one end with an eyepiece 3, the end being adapted to fit the eye; a view finding frame 4 is arranged at the other end below the cylinder, at least three conductor points are arranged on the bottom edge of the view finding frame 4, and the gravity centers of the three conductor points are coincident with the center of the view finding frame; at least two pairs of plane mirrors are arranged in the cylinder body, the plane mirrors and the horizontal plane form an angle of 45 degrees, and the mirror surfaces of each pair of plane mirrors are opposite and form an angle of 90 degrees; the connecting component is used for fixing the cylinder body on an intelligent terminal, and the view finding frame is attached to a screen of the intelligent terminal; the total length of the cylinder is equal to the specified distance of vision measurement.
The vision detecting device provided by the invention has a structure similar to that of a periscope, but the periscope changes the light propagation direction by utilizing the reflection principle of a plane mirror, so that the situation on the water surface can be seen under water. The virtual image formed by the plane mirror has the characteristic of increasing the visual distance. Therefore, the technical effect that the visual distance of the broken line of the sighting target image seen by the user can reach 5 meters is realized through the cylinder body with the limited length.
As a preferred embodiment, the size of the barrel is smaller and the barrel is of a telescopic structure in order to make the whole vision testing device smaller.
In use, one eye of a person is positioned against one end of the barrel, preferably in a trumpet shape, to allow the eye to better fit against one end of the barrel.
In order to prevent dust or other things from falling into the barrel, the plane mirror and the inside of the barrel are polluted, an eyepiece is arranged in the barrel and close to the end, plane transparent glass can be selected as the eyepiece, the eyepiece is arranged at a position close to one end of the barrel for conveniently cleaning the surface of the eyepiece, which is close to one side of human eyes, and the eyepiece is a preset distance away from one end of the barrel and cannot be arranged in a too deep place.
As a first layout of plane mirrors, as shown in fig. 2, two pairs of plane mirrors are disposed in the cylinder, the first pair of plane mirrors is disposed at the upper end of the cylinder, and the second pair of plane mirrors is disposed at the lower end of the cylinder, that is, light is projected onto the first plane mirror at the upper end of the cylinder from the view-finding frame in the cylinder, is projected onto the second plane mirror at the upper end of the cylinder through the first plane mirror, is projected onto the third plane mirror at the lower part of the cylinder through the second plane mirror, is reflected onto the fourth plane mirror by the third plane mirror, is projected onto the eyepiece at the upper end of the cylinder, and reaches the eyes of the testee through transmission. By the design of the light path, the virtual image seen by the tested person is a distance far from the tested person, so that the specified test distance is realized.
As a second plane mirror layout mode, the structure of the periscope is used as a reference, the barrel comprises at least two right-angle bends, the plane mirror is arranged at the right-angle bends of the barrel, and the plane mirror forms an angle of 45 degrees with the horizontal plane. The light path diagram is shown in fig. 4. As can be seen from fig. 4, the distance of the dashed line, which is seen by the eye as represented by the two reflections of the mirror, is a + b + c, thereby achieving the prescribed vision testing distance.
Since the virtual image seen by the human eye is a virtual image formed by reflection of a plane mirror, in order to avoid the edge of the image being unclear due to refraction of glass, the present invention preferably uses a surface mirror as the plane mirror. The use of the surface mirror can well avoid the refraction of glass to incident light, and as the surface mirror is arranged in the cylinder body, dust does not enter, and the surface mirror surface can be kept clean and not worn.
The other end of the vision detecting device is provided with a view finding frame and a connecting part, the barrel is fixed on the mobile phone screen through the connecting part, and the fit between the view finding frame and the mobile phone screen is realized.
When the vision detection device is used, firstly, after the vision detection app on the intelligent terminal is opened, the vision detection device is fixed on the screen of the intelligent terminal through the connecting device. The intelligent terminal collects the positions of the at least three conductor points, determines the display positions of the prestored sighting target images based on the positions of the conductor points, and displays the sighting target images. Therefore, the sighting target image displayed on the intelligent terminal can be ensured to be just in the view-finding frame of the vision detecting device. The frame of the view finding frame is preferably provided with three conductor points, four conductor points can be also arranged, for example, the four conductor points are made into a square, and the intelligent terminal determines the position of the center for displaying the sighting target image according to the collected position information of the four conductor points.
Because the vision testing device is used in cooperation with the app on the intelligent terminal, the sighting target image displayed on the screen of the intelligent terminal needs to be just displayed in the viewfinder of the vision testing device. When the vision detecting device is fixed on the screen, the position fixed on the screen is difficult to be fixed accurately, but the sighting target image on the screen needs to be displayed in the sighting frame. In the invention, by arranging three conductor points which are not in a straight line on the view frame, when the view frame is fixed and attached to the screen of the intelligent terminal, the intelligent terminal can detect and identify the three conductor points, so that the intelligent terminal corrects the position of the displayed sighting target image according to the positions of the detected three conductor points. The vision testing method of the vision testing device is implemented by the intelligent terminal executing a software program, which can be an app program or a browser program, as shown in fig. 5, and comprises the following steps:
s1, detecting position information of the at least three conductor point contact screens;
s2, determining the display position of the sighting target image based on the position information;
s3, sequentially displaying the sighting target images corresponding to the vision values according to the determined display positions;
S4, receiving user input;
S5, analyzing whether the user input is matched with the attribute of the displayed sighting target image, if so, considering that the test is correct, otherwise, considering that the test is wrong; and determining the vision value according to the test result corresponding to each vision value.
Based on the vision testing method, the vision testing result can be automatically obtained, the vision testing can be realized by using a common smart phone or other intelligent terminals, the vision testing can be completed by only matching one optical device with the application program executed by the smart phone, the testing result can be stored, the vision comparison can be conveniently carried out before and after, and the data support is provided for adjusting the eye use condition.
The step S2 of determining the display position of the optotype image based on the position information, as shown in fig. 6, specifically includes the following steps:
s21, determining the gravity center point of a triangle formed by the three conductor points according to the position information of the three conductor points contacting the screen;
S22, calibrating a center point display position of the sighting target image based on the center point;
s23, determining the display position of a forward mark of the visual target image according to the position information corresponding to the gravity center point and a preset conductor point;
s24, sequentially displaying prestored sighting target images based on the calibrated center point display position and the calibrated forward direction marking display position.
Through the steps, the view frame is arranged on the screen of the intelligent terminal, so that the view target image can be ensured to be displayed right below the view frame, the arrangement of the view frame is not limited, and the operation and the use are convenient. As can be seen from the above correction process, in order to simplify the calculation process of the center of gravity position, as one preferred embodiment, the three conductor points constitute an equilateral triangle, and as another preferred embodiment, the three conductor points constitute an isosceles triangle other than the equilateral triangle.
As a second correction method of the visual target image display, the correction process includes the steps of:
determining a straight line where the first conductor point and the second conductor point are located;
Aligning the straight line with a positioning datum line of the sighting target images, wherein at least one sighting target image is provided with the positioning datum line and positioning datum point information;
aligning a third conductor point with the locating datum point;
and displaying the prestored sighting target images in sequence according to the alignment result.
In this correction method, the order of calibration of the reference line before and after calibration of the reference point is not limited.
As a third correction method of the visual target image display, the correction process includes the steps of:
collecting the positions of the conductor points, and determining a first conductor point, a second conductor point and a third conductor point;
Matching a first positioning datum point of the sighting target image with a first conductor point, and storing three positioning datum points corresponding to each sighting target image;
matching a second positioning datum point and a third datum point of the sighting target image with a second conductor point and a third conductor point respectively;
And sequentially displaying the prestored sighting target images based on the three-point matching result.
After the display position and display direction of the optotype image are corrected, a voice prompt or other prompt sounds can be sent out, and the vision test process is started, namely, the step S3 is started.
The optotype images are displayed with the vision values being from low to high, and a predetermined number of optotype images are displayed for each vision value. The attributes of the optotype image include left, right, up, down.
The optotype image of the corresponding category may be displayed as the first optotype image according to the vision value input by the user, or the optotype image corresponding to the lowest vision value may be displayed as the first optotype image by default according to the program.
In the test analysis process, the following steps are executed:
S4, receiving user input;
S5, analyzing whether the user input is matched with the attribute of the displayed sighting target image, if so, considering that the test is correct, otherwise, considering that the test is wrong; and determining the vision value according to the test result corresponding to each vision value.
If the first optotype image is displayed according to the input vision value of the user, in S5, if the number of times of testing is correct reaches a predetermined threshold, the display of the optotype image corresponding to a second vision value, which is higher than the first vision value, is controlled, and the execution is repeated until the number of times of testing is incorrect reaches the predetermined threshold, and the previously corresponding vision value is output as a vision test result. And if the number of times of testing errors reaches a preset threshold, controlling to display a sighting target image corresponding to a second vision value, wherein the second vision value is lower than the first vision value, repeating until the number of times of testing errors reaches the preset threshold, and outputting the corresponding vision value.
If the first optotype image is displayed according to the default lowest vision value, in S5, if the correct number of tests reaches a preset threshold value, the optotype image corresponding to a second vision value which is higher than the first vision value is controlled to be displayed, the operation is repeatedly performed until the incorrect number of tests reaches the preset threshold value, and the vision value corresponding to the previous test is output as a vision test result.
In the invention, the sighting target images are stored in advance according to the corresponding vision value classification, each sighting target image is correspondingly stored with image attribute information, and the attribute of the sighting target image comprises left, right, upper and lower. The user can input through the voice, and the intelligent terminal determines whether the user inputs left, right, up or down through identifying and analyzing the voice. The user also can realize through the button on the eyesight testing device barrel, and button information sends intelligent terminal through wireless mode, and this just needs to set up 4 buttons on the barrel, and button connection wireless communication module receives the button signal moreover.
The visual target images may be displayed randomly or in a predetermined order over a range of visual acuity values. In the process of app operation, after detecting the three conductor points, the intelligent terminal corrects the display position of the sighting target image and displays the sighting target image, and the sighting target image cannot be seen without a vision detection device.
The technical scheme provided by the application has at least the following technical effects or advantages: the vision testing device is convenient to carry, can perform vision testing at any time and any place at low cost by combining widely used intelligent terminals to run related application programs of the vision testing method, can realize accurate vision testing according to testing process standards, and has good supporting effect on vision management (including prevention, control and monitoring).
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Claims (11)
1. A method for detecting vision by using a vision detecting device, which is characterized in that the vision detecting device is provided with a cylinder body and a connecting part, one end of the cylinder body is provided with an ocular, and the end is suitable for being attached to eyes; the other end of the cylinder is provided with a view finding frame, and the cylinder is telescopic; at least three conductor points are arranged on the bottom layer edge of the view finding frame, and the gravity centers of the three conductor points are coincident with the center of the view finding frame; the three conductor points form an isosceles triangle; at least two pairs of plane mirrors are arranged in the cylinder body, the plane mirrors and the horizontal plane form an angle of 45 degrees, and the mirror surfaces of each pair of plane mirrors are opposite and form an angle of 90 degrees; the connecting component is used for fixing the cylinder body on an intelligent terminal, and the view finding frame is attached to a screen of the intelligent terminal; the total length of the cylinder body is equal to the specified distance of vision measurement;
when vision detection is carried out, the at least three conductor points are contacted with the screen of the intelligent terminal, and the intelligent terminal is used for detecting to determine the display position of the sighting target image on the screen according to the position information of the contacted screen, and the method specifically comprises the following steps:
Determining a first matching point and a matching line according to the position information of the three conductor point contact screens;
calibrating a reference point display position of the sighting target image based on the first matching point, and storing reference point information and reference line information of the sighting target image corresponding to the sighting target image;
correcting the display position of the datum line of the sighting target image according to the matching line;
and displaying the prestored sighting target images in sequence according to the datum point display position and the datum line display position.
2. The method of vision testing with a vision testing device of claim 1, further characterized in that the eyepiece is a predetermined distance from an end of the barrel that is flared.
3. The method of vision testing with a vision testing device of claim 1, further characterized in that the three conductor points form an equilateral triangle.
4. The method of vision testing with a vision testing device of claim 1, further characterized in that the planar mirror is a surface mirror.
5. The method for vision testing with a vision testing device according to claim 1, which is performed by an intelligent terminal, further comprising, after determining the display position of the optotype image based on the position information:
sequentially displaying the optotype images corresponding to the vision values according to the determined display positions;
Receiving user input;
Analyzing whether the user input is matched with the attribute of the displayed sighting target image, if so, considering that the test is correct, otherwise, considering that the test is wrong; and determining the vision value according to the test result corresponding to each vision value.
6. The method of vision testing with a vision testing device of claim 5, further characterized by displaying a predetermined number of optotype images for each vision value in accordance with the vision value from low to high.
7. The method of vision testing with a vision testing device of claim 5, further characterized by displaying the first optotype image in accordance with user input.
8. The method of vision testing with a vision testing device of claim 5, further characterized in that the displayed first optotype image is the optotype image corresponding to the lowest vision value.
9. The method for vision testing by means of a vision testing device of claim 5, further characterized by controlling the display of a visual target image corresponding to a second vision value, which is higher than the first vision value, if the number of tests is correct reaches a predetermined threshold, and repeating until the number of tests is incorrect reaches the predetermined threshold, and outputting the previously corresponding vision value.
10. The method of vision testing with a vision testing device of claim 5, further characterized by controlling the display of a visual target image corresponding to a second vision value, which is lower than the first vision value, if the number of test errors reaches a predetermined threshold, and repeating until the number of test errors reaches the predetermined threshold, and outputting the corresponding vision value.
11. The method for vision testing with a vision testing device of claim 5, further characterized by collecting positional information of four conductor points and determining a center display position of the optotype image based on the positional information of the four conductor points.
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