CN112741592A - Vision detection device and vision detection method - Google Patents
Vision detection device and vision detection method Download PDFInfo
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- CN112741592A CN112741592A CN202110049168.1A CN202110049168A CN112741592A CN 112741592 A CN112741592 A CN 112741592A CN 202110049168 A CN202110049168 A CN 202110049168A CN 112741592 A CN112741592 A CN 112741592A
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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
Abstract
The invention discloses a vision detection device and a vision detection method, wherein the device is provided with a barrel and a connecting part; one end of the barrel is provided with an ocular lens, and the end part is suitable for being attached to the eyes; a viewing frame is arranged below the barrel, at least three conductor points are arranged on the edge of the bottom layer of the viewing frame, and the gravity centers of the three conductor points are superposed with the center of the viewing frame; a convex lens is arranged in the cylinder body; the connecting component is used for fixing the barrel on an intelligent terminal, and the viewing frame is attached to a screen of the intelligent terminal; the distance between the convex lens and the screen is the object distance, the focal length of the convex lens is larger than the object distance, and the sum of the image distance and the distance from one end of the cylinder to the convex lens is the distance specified for vision determination. The invention can perform vision detection at any time and any place cheaply, has standard detection process, can realize accurate vision detection, and plays a good support role in vision management (including prevention, control and monitoring).
Description
Technical Field
The invention relates to the technical field of optometry and optometry, in particular to an optometry device and an optometry method.
Background
At present, most of vision tests are performed by using visual charts, and the vision tests can be performed only in fixed places, large spaces and environments with standard visual chart brightness, and at present, the vision tests are generally performed in places such as hospitals and spectacle shops. Because the vision detection needs to be specially carried out in a fixed place, the detection is carried out when people feel that the vision is possibly problematic, and the passive detection leads to that the vision is not responded but can not be prevented and controlled in advance. If the vision test can be self-tested at any time and any place without being limited to specific environments and facilities, the vision test is a very favorable support in the aspect of vision protection and the aspect of preventing and controlling vision problems.
Disclosure of Invention
In view of the above, the present invention has been developed to provide a solution that overcomes, or at least partially solves, the above-mentioned problems. Accordingly, in one aspect of the present invention, there is provided a vision testing device having a barrel provided with an eyepiece at one end adapted to fit an eye, and a connecting member; a viewing frame is arranged at the other end below the barrel, at least three conductor points are arranged on the edge of the bottom layer of the viewing frame, and the centers of gravity of the three conductor points are overlapped with the center of the viewing frame; the distance between the convex lens and the screen is the object distance, the focal length of the convex lens is larger than the object distance, and the sum of the image distance and the distance from one end of the cylinder to the convex lens is the distance specified for vision determination.
Optionally, the barrel is telescopic.
Optionally, the eyepiece is a predetermined distance away from one end of the barrel, and one end of the barrel is horn-shaped.
Optionally, the three conductor points form an isosceles triangle.
Optionally, the three conductor points form an equilateral triangle.
The invention also provides a method for vision detection based on the vision detection device, which is executed by the intelligent terminal and comprises the following steps:
detecting position information of the at least three conductor points contacting the screen;
determining a display position of the sighting target image based on the position information;
sequentially displaying the sighting target images corresponding to the vision values according to the determined display positions;
receiving a user input;
analyzing whether the user input is matched with the attribute of the displayed sighting target image, if so, determining that the test is correct, otherwise, determining that the test is wrong; and determining the visual force value according to the test result corresponding to each visual force value.
Determining a display position of the optotype image based on the position information, including:
determining a first matching point and a matching line according to the position information of the three conductor points contacting the screen;
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 reference line of the sighting target image according to the matching line;
and sequentially displaying the pre-stored sighting target images according to the display position of the reference point and the display position of the reference line.
Optionally, the visual target images are displayed from low to high according to the vision values, and a predetermined number of visual target images are displayed corresponding to each vision value.
Optionally, the first optotype image is displayed according to a user input.
Optionally, the displayed first sighting target image is the sighting target image corresponding to the lowest visual force value.
Optionally, if the number of times of correct testing reaches a predetermined threshold, controlling to display a visual target image corresponding to a second visual force value, where the second visual force value is higher than the first visual force value, repeating the execution until the number of times of wrong testing reaches the predetermined threshold, and outputting the previous corresponding visual force value.
Optionally, if the number of times of the test error reaches a predetermined threshold, controlling to display a visual target image corresponding to a second visual force value, wherein the second visual force value is lower than the first visual force value, repeating the execution until the number of times of the test error reaches the predetermined threshold, and outputting the corresponding visual force value.
Optionally, the position information of the four conductor points is collected, and the central display position of the sighting target image is determined based on the position information of the four conductor points.
The technical scheme provided by the application at least has the following technical effects or advantages: the vision detection device is convenient to carry, combines the application that the intelligent terminal of extensive use operation corresponds, can carry out vision detection anytime and anywhere cheaply, and the testing process standard can realize accurate vision detection moreover, plays fine supporting role to the management of eyesight (including prevention and control, supervision).
The above description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the technical solutions of the present invention and the objects, features, and advantages thereof more clearly understandable.
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 refer to like parts throughout the drawings. In the drawings:
FIG. 1a is a perspective view of a vision testing device provided in the present invention;
FIGS. 1b to 1f show front, left, rear, bottom and top views of a vision testing device provided by the present invention;
fig. 2 shows an optical path diagram of a vision inspection apparatus proposed by the present invention;
FIG. 3 is a flow chart of the vision testing by the vision testing device of the present invention in combination with an intelligent terminal;
fig. 4 shows a process of correcting and displaying the sighting target image based on the vision detection device by the 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 invention are shown in the drawings, it should be understood that the invention can 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.
As proved in the technical operating Specification for visual acuity test, the visual acuity test chart can be selected from 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, the examination distance of the first two visual acuity test charts is 5m, and the examination distance of the latter visual acuity test chart is 4m, so that the existing visual acuity test charts require spacious physical space. The technical operating specification of vision examination requires that 1.0 line of the visual chart should be as high as the eye to be examined, however, the visual charts are fixed on the wall, and the height of the person to be examined is different, and the difference is large, so that the requirement is difficult to meet in the actual vision examination. The technical operating specification of vision examination also requires that the illumination of the visual chart should be uniform and free of glare, if manual illumination is used, the illumination intensity should be 300-.
The invention aims to provide a device and a method for conveniently and accurately detecting eyesight without being limited by physical space on the basis of meeting the specifications. The vision testing device provided by the invention is a separate product or device. When the eyesight is detected, the method needs to be matched with an app running on the intelligent terminal for use. The intelligent terminal can provide stable sighting target image backlight brightness and sighting target patterns meeting requirements.
In one aspect of the present invention, there is provided a vision testing device, as shown in fig. 1a-f, having a barrel 1 provided at one end with an eyepiece 3 adapted to fit the eye, and a connecting part 2; a viewing frame 4 is arranged at the other end below the barrel, at least three conductor points 6, 7 and 8 are arranged on the edge of the bottom layer of the viewing frame, and the gravity centers of the three conductor points are superposed with the center of the viewing frame; the distance between the convex lens and the screen is an object distance, the focal length of the convex lens is larger than the object distance, and the sum of the image distance and the distance from one end of the cylinder to the convex lens is a specified distance for vision determination.
The vision testing device provided by the invention utilizes the imaging principle of the convex lens, as shown in figure 2. The convex lens imaging formula is as follows:
1/u+1/v＝1/f
where u is the object distance, v is the image distance, and f is the focal length.
In this application, the distance between the convex lens and the mobile phone screen is an object distance u, and the object distance u is smaller than the focal length f, so that a virtual image is formed on one side of the mobile phone screen, which is opposite to the convex lens. The length of the barrel plus the image distance is ensured to be equal to the testing distance specified in the technical operating specification of vision examination, namely 5 meters (or 4 meters). The appropriate convex lens is selected according to the length of the barrel and the focal length parameters of the convex lens on the market, and the convex lens is arranged in the barrel, generally close to the position of the view finder. Therefore, the technical effect that the visual distance of the dotted line of the sighting mark image seen by the user can reach 5 meters is achieved through the barrel with the limited length. Because the virtual image which is vertically amplified is formed by the convex lens and the same side of the intelligent terminal, the sighting target image displayed on the intelligent terminal is the sighting target image which is reduced by the corresponding times according to the amplification times.
As a preferred embodiment, in order to make the whole vision testing device smaller, the size of the barrel body is smaller, and the barrel body is of a telescopic structure.
In use, an eye of a person is positioned against one end of the barrel, looking inwardly, said one end of the barrel preferably being flared in order to allow the eye to better engage said one end of the barrel.
In order to avoid dust or other things to fall into the bucket, make dirty convex lens, barrel inside, be close to this end department in the barrel and be provided with the eyepiece, can select plane transparent glass as the eyepiece, be close to the surface of people's eye one side for the convenience of clean eyepiece, the eyepiece will be settled and be close to the position of barrel one end, the eyepiece is apart from barrel one end predetermined distance can not set up in too dark place.
The other end of the vision detection device is provided with a viewing frame 4 and a connecting component 2, and the barrel is fixed on the mobile phone screen through the connecting component 2, so that the viewing frame is attached to the mobile phone screen.
During the use, open visual detection app on the intelligent terminal at first after, fix the visual detection device on the intelligent terminal screen through connecting device again. The intelligent terminal collects the positions of the at least three conductor points, determines the display position of the pre-stored sighting target image based on the positions of the conductor points, and displays the sighting target image.
Because the vision detection device is used with the app on the intelligent terminal in a matched manner, the sighting target image displayed on the screen of the intelligent terminal is required to be just displayed in the viewing frame of the vision detection device. When the vision inspection device is fixed on the screen, the position fixed on the screen is difficult to be accurately fixed, but the visual target image on the screen needs to be displayed in the visual frame. In the invention, the three conductor points which are not in a straight line are arranged on the view-finding frame, and when the view-finding frame is fixed and attached to the screen of the intelligent terminal, the intelligent terminal can detect and recognize the three conductor points, so that the intelligent terminal corrects the position of the displayed sighting target image according to the detected positions of the three conductor points, and then performs the vision detection process.
As shown in fig. 3, the vision testing method using the vision testing apparatus is implemented by the intelligent terminal executing a software program, and includes the following steps:
s1, detecting position information of the at least three conductor point contacts with a screen;
s2, determining the display position of the sighting target image based on the position information;
s3, sequentially displaying the visual target images corresponding to the visual force 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, determining that the test is correct, otherwise, determining that the test is wrong; and determining the visual force value according to the test result corresponding to each visual force value.
The step S2 determines the display position of the optotype image based on the position information, and specifically includes the following steps, as shown in fig. 4:
s21, determining a triangular gravity center point formed by the three conductor points according to the position information of the three conductor points contacting the screen;
s22, calibrating the central point display position of the sighting mark image based on the gravity center point;
s23, determining the display position of the forward marking of the sighting mark image according to the gravity center point and the position information corresponding to a preset conductor point;
and S24, sequentially displaying the pre-stored sighting target images based on the calibrated central point display position and the calibrated forward marking display position.
Through the steps, as long as the viewing frame is placed on the screen of the intelligent terminal, the sighting target image can be guaranteed to be displayed under the viewing frame, so that the viewing frame is not limited to be placed, 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 position of the center of gravity, 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 for 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 reference line of the sighting target images, wherein at least one sighting target image is provided with the positioning reference line and positioning reference point information;
aligning a third conductor point with the positional reference point;
and sequentially displaying the pre-stored sighting target images according to the alignment result.
In this calibration method, the order of the calibration of the reference line and the calibration of the reference point is not limited.
As a third correction mode of the sighting target image display, the correction process comprises the following steps:
collecting the position of a conductor point, and determining a first conductor point, a second conductor point and a third conductor point;
matching a first positioning reference point of the sighting target image with a first conductor point, wherein three positioning reference points are stored corresponding to each sighting target image;
matching the second positioning reference point and the third reference point of the sighting mark image with a second conductor point and a third conductor point respectively;
and sequentially displaying the pre-stored sighting target images based on the three-point matching result.
After the display position and the display direction of the sighting target image are corrected, a voice prompt or other prompt tones can be sent out, the vision testing process is started, and the step S3 is executed.
And displaying the visual target images according to the visual values from low to high, and displaying a preset number of visual target images corresponding to each visual value. The attributes of the sighting target image comprise left, right, upper and lower.
The optotype image corresponding to the 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 a program.
In the process of testing and analyzing, the following steps are carried out:
s4, receiving user input;
s5, analyzing whether the user input is matched with the attribute of the displayed sighting target image, if so, determining that the test is correct, otherwise, determining that the test is wrong; and determining the visual force value according to the test result corresponding to each visual force value.
If the first visual target image is displayed according to the input visual force value of the user, in S5, if the number of times of correct testing reaches a predetermined threshold, controlling to display a visual target image corresponding to a second visual force value, which is higher than the first visual force value, repeating the execution until the number of times of wrong testing reaches the predetermined threshold, and outputting the previously corresponding visual force value as a vision test result. And if the times of the test errors reach a preset threshold value, controlling to display a visual target image corresponding to a second visual force value, wherein the second visual force value is lower than the first visual force value, repeatedly executing until the times of the test errors reach the preset threshold value, and outputting the corresponding visual force value.
If the first optotype image is displayed at the default lowest vision value, in S5, if the number of times of correct testing reaches a predetermined threshold, controlling to display the optotype image corresponding to a second vision value higher than the first vision value, repeating the execution until the number of times of wrong testing reaches the predetermined threshold, and outputting the previously corresponding vision value as the vision test result.
In the invention, the sighting target images are stored in advance according to the corresponding vision values in a classified manner, image attribute information is correspondingly stored in each sighting target image, and the attributes of the sighting target images comprise left, right, upper and lower. The user can input through voice, and the intelligent terminal determines whether the user inputs left, right, up or down through recognizing and analyzing the voice. The user also can realize through the button on the eyesight detection device barrel, and button information sends intelligent terminal through wireless mode, and this just needs to set up 4 buttons on the barrel, and key-press connection wireless communication module receives the key signal moreover.
The display of the sighting target images in a vision value range can be randomly displayed or displayed according to a preset sequence. In the running process of the app, the intelligent terminal corrects the display position of the sighting target image and displays the sighting target image after detecting the three conductor points, and the sighting target image cannot be seen through the sighting target detection device.
The technical scheme provided by the application at least has the following technical effects or advantages: the vision detection device is convenient to carry, combines the application that the intelligent terminal of extensive use operation corresponds, can carry out vision detection anytime and anywhere cheaply, and the testing process standard can realize accurate vision detection moreover, plays fine supporting role to the management of eyesight (including prevention and control, supervision).
In the description provided herein, numerous specific details are set forth. It is understood, however, 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 foregoing 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 invention and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed 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 (13)
1. A vision testing device is characterized in that the device is provided with a cylinder body and a connecting component; one end of the barrel is provided with an ocular lens, and the end part is suitable for being attached to the eyes; a viewing frame is arranged below the barrel, at least three conductor points are arranged on the edge of the bottom layer of the viewing frame, and the gravity centers of the three conductor points are superposed with the center of the viewing frame; a convex lens is arranged in the cylinder body; the connecting component is used for fixing the barrel on an intelligent terminal, and the viewing frame is attached to a screen of the intelligent terminal; the distance between the convex lens and the screen is the object distance, the focal length of the convex lens is larger than the object distance, and the sum of the image distance and the distance from one end of the cylinder to the convex lens is the distance specified for vision determination.
2. The vision testing device of claim 1, further characterized in that the barrel is telescoping.
3. The vision testing device of claim 1, further characterized in that said eyepiece is a predetermined distance from an end of said barrel, said barrel end being flared.
4. The vision testing device of claim 1, further characterized in that said three conductor points form an isosceles triangle.
5. The vision testing device of claim 1, further characterized in that said three conductor points form an equilateral triangle.
6. A method for performing vision test based on the vision testing apparatus of claim 1, the method being executed by a smart terminal, the method comprising:
detecting position information of the at least three conductor points contacting the screen;
determining a display position of the sighting target image based on the position information;
sequentially displaying the sighting target images corresponding to the vision values according to the determined display positions;
receiving a user input;
analyzing whether the user input is matched with the attribute of the displayed sighting target image, if so, determining that the test is correct, otherwise, determining that the test is wrong; and determining the visual force value according to the test result corresponding to each visual force value.
7. The vision detecting method according to claim 6, wherein 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 points contacting the screen; 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 reference line of the sighting target image according to the matching line;
and sequentially displaying the pre-stored sighting target images according to the display position of the reference point and the display position of the reference line.
8. The vision testing method of claim 6, further characterized in that the optotype images are displayed from low to high in accordance with the vision values, and a predetermined number of optotype images are displayed for each vision value.
9. The vision testing method of claim 6, further characterized in that the first optotype image is displayed in accordance with a user input.
10. The vision testing method of claim 6, further characterized in that the displayed first optotype image is the optotype image corresponding to the lowest visual force value.
11. The vision testing method of claim 6, further characterized in that if the number of times of testing correctness reaches a predetermined threshold value, the control unit displays the optotype image corresponding to a second visual force value higher than the first visual force value, and repeats the execution until the number of times of testing mistakes reaches the predetermined threshold value, and outputs the previous corresponding visual force value.
12. The vision testing method of claim 6, further characterized in that if the number of times of testing errors reaches a predetermined threshold, the control unit displays the optotype image corresponding to the second vision value lower than the first vision value, and repeats the process until the number of times of testing errors reaches the predetermined threshold, and outputs the corresponding vision value.
13. The method of claim 6, further characterized by acquiring position information of four conductor points, and determining a center display position of the optotype image based on the position information of the four conductor points.
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| CN211066539U (en) * | 2019-07-01 | 2020-07-24 | 武汉真元生物数据有限公司 | Vision detection device and equipment |
| CN212066682U (en) * | 2020-01-21 | 2020-12-04 | 李文锋 | Portable eyesight detection device and eyesight detection system |
| CN214856574U (en) * | 2021-01-14 | 2021-11-26 | 沈阳视达微医疗科技有限公司 | Vision detection device |
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| CN204246108U (en) * | 2014-11-15 | 2015-04-08 | 陇华 | Eyesight detecting instrument |
| CN109984720A (en) * | 2019-04-28 | 2019-07-09 | 宁夏蓝医人医药科技发展有限公司 | A kind of eye test equipment and system |
| CN211066539U (en) * | 2019-07-01 | 2020-07-24 | 武汉真元生物数据有限公司 | Vision detection device and equipment |
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