CN219557259U - Self-service diopter measurement system - Google Patents

Abstract

The utility model provides a self-service diopter measurement system, which comprises: the visual target display device is used for displaying visual targets to the testee; the distance detection device is used for detecting the distance between the tested person and the sighting target; bias glasses for providing bias diopter for the tested person; the feedback device is used for enabling the tested person to feed back the visual target recognition result to the central controller; and the central controller is respectively connected with the feedback device and the distance detection device. The diopter of the tested person is corrected to a certain extent through the offset glasses, so that the diopter measurement range carried out later is smaller, higher measurement accuracy can be achieved, the test speed is accelerated, the moving distance range required by the diopter measurement of the tested person can be shortened, and the self-service diopter test is realized.

Description

Self-service diopter measurement system

Technical Field

The utility model relates to the technical field of diopter measurement, in particular to a self-service diopter measurement system.

Background

The effect of the eye in refracting light is known as refraction. The eyes are visual organs which take light as the adaptive stimulus, the eyeballs can be regarded as an optical system from the optical angle, and light rays emitted or reflected by external objects are refracted through the eyeballs to form clear and reduced inverted images on the retina. However, adjusting a relaxed eye causes parallel light entering the eye to converge in front of or behind the retina, creating a refractive error. Refractive errors include myopia, hyperopia and astigmatism.

Most of the current vision tests adopt standard logarithmic visual charts meeting the requirements of national standard GB11533-2011, and the field test needs to be carried out at a fixed position or a fixed space under the guidance of medical staff, so that the convenience is poor. The prior diopter measurement generally uses a shack Hartmann wavefront sensor to acquire a facula array image of an eye, diopter information is acquired based on the facula array image, and as in the technical scheme disclosed in the prior patent CN109645956B, staff is required to conduct guidance, and convenient self-help diopter measurement cannot be realized. Although the chinese patent with publication number CN113197542a discloses an online self-help vision testing system, which is provided with a distance calculating module, a size calculating module, a display adjusting module, a vision judging module and the like, and can realize accurate self-help vision testing without time and place limitation and assistance of auxiliary personnel, the system is used for measuring vision, when measuring vision (Visual acuity), firstly, a vision distance is determined, the distance commonly used in medicine is 5 meters, 6 meters, 20 feet and the like, then the size (such as 1.0,0.8,0.5) of each class E-shaped vision mark on a display screen is determined, and the measuring process is to find out how large the vision mark can be seen by a subject under the given distance. In giving Visual acuity (Visual acuity) results, the complete results generally describe the viewing distance at the time of measurement, e.g., the denominator 6 in Visual acuity chart X/6 in the united kingdom, i.e., the measuring viewing distance is 6 meters, and the denominator 20 in Visual acuity chart X/20 in the united states, i.e., the viewing distance is 20 feet. It can be seen that the distance calculation module of this patent obtains the distance in order to convert to standard sight distance to obtain the eyesight test result from the inquiry of national standard GB11533-2011, and needs fixed distance measurement, but in the prior art, choose the maximum distance between the tested person and the sighting target when the feedback of the tested person is "can see clearly" or the error rate is smaller than the error rate threshold, the reciprocal of the maximum distance is diopter, and it can be seen that patent CN113197542a cannot be used for diopter measurement. In addition, in order to measure a wide range of diopters without the bias glasses, the distance between the measured person and the display is generally more than 2 meters and less than 10 cm, which requires a high resolution of both the camera and the display.

Disclosure of Invention

The utility model aims to at least solve the technical problems in the prior art and provides a self-service diopter measurement system.

In order to achieve the above object of the present utility model, the present utility model provides a self-service diopter measurement system including: the visual target display device is used for displaying visual targets to the testee; the distance detection device is used for detecting the distance between the tested person and the sighting target; bias glasses for providing bias diopter for the tested person; the feedback device is used for enabling the tested person to feed back the visual target recognition result to the central controller; and the central controller is respectively connected with the feedback device and the distance detection device.

The technical scheme is as follows: the system enables the diopter of the tested person to be corrected to a certain extent (incomplete correction) by putting the offset glasses on the tested person in advance, so that the diopter measurement range of the tested person is smaller, higher measurement accuracy can be achieved, the test speed is accelerated, the moving distance range of the tested person during diopter measurement can be shortened, and meanwhile, the requirements on equipment such as a camera and a display are reduced; the tested person can feed back the identification result of the sighting mark by self through the feedback device, so that the self-help diopter test is realized, and the labor investment is reduced.

Drawings

FIG. 1 is a system block diagram of a self-service diopter measurement system in a preferred embodiment of the present utility model;

FIG. 2 is a schematic view of an E-shaped optotype in accordance with a preferred embodiment of the utility model;

FIG. 3 is a schematic view of an astigmatic visual target in accordance with a preferred embodiment of the present utility model;

FIG. 4 is a schematic diagram of E-shaped optotype size adjustment in an application scene according to the present utility model;

FIG. 5 is a diagram illustrating astigmatic index size adjustment in an application scenario according to the present utility model;

FIG. 6 is a schematic diagram of obtaining a distance between a tested person and a sighting target in an application scene of the present utility model;

fig. 7 is a schematic diagram of a real-time position display area in an application scenario of the present utility model.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the present utility model, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.

The present utility model discloses a self-service diopter measurement system, in a preferred embodiment, as shown in FIG. 1, comprising: the visual target display device is used for displaying visual targets to the testee; the distance detection device is used for detecting the distance between the tested person and the sighting target; bias glasses for providing bias diopter for the tested person; the feedback device is used for enabling the tested person to feed back the visual target recognition result to the central controller; and the central controller is respectively connected with the feedback device and the distance detection device.

In this embodiment, the present system may be used to measure a variety of diopters, such as myopia, hyperopia, astigmatism, myopia+astigmatism, and the like. When measuring the equivalent sphere diameter refractive error (i.e. diopter) of myopia or hyperopia, a turnling E optotype (shown in fig. 2) or a C optotype on the international visual chart can be adopted, and the directions of the letter optotypes can be up, down, left, right, or oblique directions as shown in fig. 2.

In this embodiment, when the system tests refractive errors of astigmatism, an astigmatic index as shown in fig. 3 may be used, consisting of a series of fringes of different directions. There may be some line in each set of stripes as a dashed line (which is randomly generated by the system). The test person needs to report which one is the dotted line or has no dotted line through the feedback device when measuring astigmatism.

In this embodiment, preferably, the optotype displaying device is a display, and the display is connected to the central controller; the display is used for displaying the optotype, or the display is used for displaying the optotype and operation indication, wherein the operation indication is preferably but not limited to ' forward further ' or ' backward one step ' or ' still or ' please feed back ', etc. The display is preferably but not limited to a computer display screen or a television screen or an LED display screen or a liquid crystal display screen with a communication interface, and the display is in communication connection with a central controller through the communication interface, and the central controller is preferably but not limited to a multi-interface computer host or a notebook computer or an embedded system.

In this embodiment, the lenses on the offset glasses may be myopia or hyperopia or astigmatism offset lenses, or a combination of myopia and astigmatism lenses, or the like. Preferably, to facilitate mounting of the lenses, lens mounting slots are provided on the offset spectacles. In the myopia offset lens group, a plurality of myopic lenses with sphere diameter degrees, such as-100, -200, -250, -300, -400, -500, and the like, if the tested person is myopia+astigmatism, the horizontal cylinder diameter degrees-75, -150, and the like are respectively added on the basis of the sphere diameter degrees; alternatively, the vertical column diameter degree is added to-75, -150, etc. based on the above sphere diameter degree. Included in the presbyopic offset lens group are +100, +200, +300, +400, etc. The offset diopter of the offset glasses is the sphere diameter of the lens or the horizontal cylinder diameter of the lens or the sum of the horizontal cylinder diameter and the sphere diameter.

In the present embodiment, the offset diopter is preferably determined based on the historical diopter of the subject, and the historical diopter of the subject is known in advance so that the offset diopter of the offset glasses after the lens is attached is close to the historical diopter. Specifically, according to the diopter history record of a myopic patient, a relatively close under correction degree (namely offset diopter) is selected, the diopter measurement is carried out after the myopic patient wears the myopic patient, and the under correction amount can be as small as about-100 degrees, or as large as-200 degrees, -250 degrees, -300 degrees and the like. The greater the amount of under correction, the fewer the number of offset eyeglasses that need to be provided. Such as: patients with myopia of about-400 degrees can be assigned under-correction glasses of-200 degrees or-250 degrees according to the record. For the tested person with serious astigmatism, the astigmatism offset lens can be adopted, and the method is the same as the spherical power under correction principle of myopia offset. Such as: the subject with 150 degrees astigmatism was assigned a bias of-75 degrees. For far vision testees, the offset spectacles used should be overcorrected far vision power. Such as: for patients with +200 degrees of hyperopia, +300 degrees or +400 degrees of offset eyeglasses are dispensed. The coarse bias may reduce the number of biased spectacles. For patients with combined hyperopia and astigmatism, sphere power needs to be overcorrected, while cylinder power does not. Preferably, if the historic diopters of the left and right eyes of the tested person are different, the offset diopters of the left and right lenses are set to be different accordingly.

In this embodiment, if the person to be measured is located at a distance of typically 2 meters or more and as close as 10 cm from the display under the condition of no offset glasses, the requirements of the camera and the display are determined by the distance, and the requirements of the latter are determined by the close distance. The offset glasses enable the moving distance of the tested person to be in a moderate and small range, so that the equipment with common resolution (such as a camera and a display) can meet the requirements, and the cost is reduced.

In this embodiment, the offset spectacles also have a fog vision effect, and children with myopia generally have a strong accommodation ability, and ciliary muscles are not easy to relax and even spasm without mydriasis, which will cause a higher measurement result. Because the offset spectacles provide under correction, it is equivalent to superimposing a slightly offset positive lens on top of a near negative lens, as opposed to a full correction. The use of positive lenses to create fog to induce relaxation of the ciliary muscle is one method commonly used clinically. In the present system, this is implemented as an under-corrected negative lens.

In this embodiment, the bias diopter information of the bias eyeglasses is preferably but not limited to being input to the central controller via an input device, preferably but not limited to a touch screen or keyboard, for subsequent processing by the central controller.

In this embodiment, the feedback device is preferably an operating handle, which is in communication with the central controller. Further preferably, the operation handle includes a tested person input module and a handle communication module, the tested person input module is preferably but not limited to an existing key set key, touch screen or voice recognition module, and the tested person feeds back the visual target recognition result by means of keys, touch, voice dialogue and the like, and the visual target recognition result is preferably but not limited to "invisible", "visible", "letter to the left", "letter to the right". The handle communication module and the central processing unit can be connected in a wired or wireless mode, and the handle communication module is preferably but not limited to an existing RS232 serial port communication module or an RS485 serial port communication module or a WIFI communication module or a Bluetooth module or a radio frequency communication module for remote control.

In this embodiment, the central controller is connected to the display, the distance detection device, and the feedback device, respectively. The distance detection device is preferably, but not limited to, an existing laser range finder or ultrasonic range finder or the like. The central controller is used for obtaining diopter test results according to the distance between the tested person and the sighting target, the sighting target identification result and the offset diopter output by the distance sensor. Specifically, when the identification result of the sighting target fed back by the tested person is 'can see clearly' or the error rate is smaller than the error rate threshold value, the central controller obtains the distance between the tested person and the sighting target at the moment; selecting the maximum distance between the tested person and the sighting mark when the feedback of the tested person can be seen clearly or the error rate is smaller than the error rate threshold, obtaining the diopter value corrected by the tested person through the maximum distance, and adding the diopter value corrected to the offset diopter of the offset glasses to obtain the final diopter value of the tested person. In the above process, the reciprocal of the maximum distance is the diopter, and the calculation process is the prior art, and it should be noted that the method involved in the above process is not within the protection scope of the present utility model.

In the embodiment, the distance between the person to be measured and the optotype is not fixed during the system measurement, the person to be measured can approach the optotype from far to near, the identification result of the optotype is continuously fed back to the central controller through the feedback device in the moving process, and after the person to be tested moves to a position point capable of seeing the optotype clearly, the central controller obtains the diopter test result according to the distance between the person to be tested and the optotype, the identification result of the optotype and the offset diopter, so that the diopter measurement convenient and self-service is realized.

In this embodiment, when the subject performs near-vision diopter or far-vision diopter measurement, the corrected diopter value of the subject is the reciprocal of the maximum distance, and the corrected equivalent sphere diameter R is:dis represents the maximum distance between the subject and the optotype when the subject feedback "can see clearly". Similarly, when the astigmatism diopter measurement is performed by the subject, using the astigmatism optotype shown in fig. 3, the maximum distance (distance between the subject and the optotype) distar when the feedback of the subject can see only one fringe is obtained, and the maximum distance (distance between the subject and the optotype) when the feedback of the subject can see all fringes is obtained, so as to obtain the spherical power corrected by the subject>The corrected cylinder power of the tested person is +.>It should be noted that the method involved in the above process is not within the scope of the present utility modelAnd is enclosed inside.

In a preferred embodiment, in order to expand the system function and simplify the system structure, it is further preferred that the distance detecting device is a camera, the camera is used for capturing an image of the front surface of the tested person, and the camera is connected with the central controller. Further preferably, the camera can be fixed at the upper end of the display through a mounting clamp or a sticking seat, and the distance between the tested person and the camera is the distance between the tested person and the sighting mark display device. The central controller is used for acquiring the distance between the tested person and the sighting target according to the front image of the tested person output by the camera, and the distance between the tested person and the sighting target is the distance between the tested person and the display. The specific process of obtaining the distance can refer to the technical scheme disclosed in the chinese patent with publication number CN113197542a in the prior art, and will not be described herein.

In a preferred embodiment, to improve the accuracy of the test, the central controller preferably includes a target display adjustment module that adjusts the size of the target in the display according to the distance between the subject and the target. The specific implementation process of the optotype display adjustment module can refer to the technical scheme disclosed in the chinese patent with publication number CN113197542a in the prior art, and will not be described herein. The central controller determines that the tested person needs to be positioned at a series of different positions from the sighting target display device, and according to the distance detection result, the central controller controls the linear size of the sighting target on the sighting target display device in real time, and finally when the tested person correctly identifies the sighting target, diopter is calculated according to the positioned distance and the offset glasses.

In a preferred embodiment, the offset spectacles are provided with identification marks, which are in one-to-one correspondence with the offset diopters of the offset spectacles, the identification marks being associated with the offset diopters of the two lenses of the offset spectacles. Preferably, the identification mark is a two-dimensional code label or a one-dimensional code label, and the identification mark can be scanned by the bar code scanning equipment to obtain the offset diopter of the offset glasses, so that the degree of automation is improved.

In the present embodiment, if the historical diopter of the subject is small or the diopter is normal, the lens of the offset glasses may be set as a plano lens or a lens is not required.

In this embodiment, in order to facilitate asynchronous replacement of the left and right lenses and to enable rapid acquisition of the offset diopter of each lens while simplifying the system, it is further preferable that, as shown in fig. 6, the system includes left and right identification marks provided on both lenses of the offset glasses, respectively, the left identification mark being in one-to-one correspondence with the offset diopter of the left lens, and the right mark being in one-to-one correspondence with the offset diopter of the right lens.

In this embodiment, it is further preferable that, in order to simplify the system configuration, the central controller includes a bias diopter recognition module that recognizes a recognition mark in the front image of the subject to obtain a bias diopter of the bias glasses, by making full use of the image information acquired by the camera. The offset diopter recognition module is a conventional bar code recognition module, which is the prior art and will not be described in detail herein. The offset diopter recognition module respectively recognizes left and right recognition marks in the front image of the tested person to obtain offset diopters of the two lenses

In a preferred embodiment, the initial distance is found to be different in different test efficiency according to a plurality of tests, so that the system further comprises an initial distance mark positioned on the ground in front of the sighting mark display device, and a tested person stands at the initial distance mark position when starting the test, so that the test efficiency can be improved. The initial distance mark is from 1.8 meters to 2.1 meters, preferably 2 meters, from the visual target display device. The initial distance mark is preferably, but not limited to, an indicator tape or paint mark that is affixed to the ground.

In an application scenario of the self-service diopter measurement system provided by the utility model, the central controller can obtain the real-time distance between the optotype and the testee according to the front image of the testee, which is shot by the camera in real time, and also can obtain the distance between the testee and the optotype when the testee feeds back the identification result of the optotype, so that the waste of calculation resources can be avoided.

In this application scenario, central controller still includes the optotype and shows the adjustment module, and the optotype shows the adjustment module and shows the linear size of optotype in the display according to the person's of being tested and the distance of optotype, and the optotype remains unchanged to the opening angle of human eye, and specific process is:

the central controller acquires the front image of the tested person from the camera in real time, and acquires the real-time distance between the tested person and the sighting target based on the front image of the tested person;

the same proportion enlarges the size of the optotype displayed in the display when the real-time distance increases, and reduces the size of the optotype displayed in the display when the real-time distance decreases.

In this application scenario, as shown in fig. 4, the angle of opening θ of the letter optotype to the glasses remains unchanged regardless of the distance the subject is located, θ is preferably but not limited to 5 degrees, which corresponds to 1.0 vision; similar to the letter optotype, the size of the astigmatism optotype varies as shown in fig. 5, with the angle of each set of fringes remaining constant at each different distance. So that the optotype displayed on the screen is reduced as the subject approaches the display screen, and is enlarged as the subject retreats.

In this application scenario, it is further preferable that, in order to further improve accuracy of diopter test, the optotype display adjustment module controls the display to display the white background optotype first, when the person to be tested feeds back and can see the white background optotype, then further controls the display to display the red-green background optotype, that is, the optotype with red background and green background appears on the display interface at the same time, so as to determine diopter more precisely, when the person to be tested can see the red-green background optotype at the same time or the error rate is smaller than the error rate threshold, and when the optotype identification accuracy is the same, then it is considered that fine diopter test can be performed.

In the application scene, when the left and right lenses on the offset glasses are respectively provided with the left identification mark and the right identification mark, the central controller also comprises a distance acquisition module for accelerating the data processing speed, reducing the operation complexity and improving the distance acquisition accuracy; the distance acquisition module is used for acquiring the distance between the tested person and the optotype according to the pixel distance of the two identification marks in the front image of the tested person, the geographic space distance of the two identification marks and the camera parameters. The camera parameters preferably, but not limited to, include the field angle and the number of resolution pixels of the camera.

In this application scenario, as shown in fig. 6, the geospatial distance of two recognition marks is W, and the field angle of view of the camera is V, the distance d between the tested person and the optotype can be obtained according to the following formula,wherein Z represents the pixel distance of the two marks, namely the number of pixel points representing the distance between the center points of the two marks in the front image of the tested person, and F represents the resolution pixel number of the camera.

In this application scenario, in order to improve user experience and speed up testing, the central controller includes a distance adjustment module, and when the visual target recognition result of the tested person is unclear or the error rate reaches the error rate threshold, the distance adjustment module is used for obtaining distance adjustment information of the tested person according to the visual target display state and the distance between the tested person and the visual target, where the distance adjustment information includes the moving direction of the tested person and/or the moving distance of the tested person. The direction of movement includes forward or reverse.

In the application scenario, the distance adjustment information acquisition process includes: when the front optotype is a red-green background optotype, if the testee can only see the green background optotype or the error rate of the green background optotype is smaller than the error rate threshold, the distance adjustment information is as follows: back one step, and the step distance isdis represents the current distance between the tested person and the sighting target obtained by the central controller; if the testee can only see the red background optotype or the error rate of the red background optotype is smaller than the error rate threshold, the distance adjustment information is as follows: further before, and the step size is +.>If the tested person can see the red and green background targets or the error rates of the two background targets are smaller than the error rate threshold value, the distance does not need to be adjusted; when the front optotype is not red-green, such as white background black optotype, if the feedback is invisible or invisibleWhen the optotype recognition error rate is smaller than the error rate threshold, the distance adjustment information is as follows: and further before.

In the application scenario, preferably, in order to improve the user experience, the distance adjustment information is notified to the tested person by means of voice prompt or display.

In this application scenario, in order to make the person under test move in suitable distance range, accelerate test speed, improve measurement accuracy, preferably, central controller still includes initial distance acquisition module, and initial distance acquisition module is used for setting up the initial distance of person under test from the optotype according to the historical diopter of person under test, specifically includes:

when the tested person does not have bias measurement, for example, the historical diopter of the tested person cannot be known or the tested person does not have the historical diopter, the initial distance is set to be L meters, the value range of L is 1.5-3, and preferably L is 2;

when the historical diopter of the tested person is known and the worn offset glasses have offset diopter, the initial distance is set as:

wherein R is ₀ Representing the historical diopter value, floor (·) represents the downward rounding function.

In this application scenario, in order to improve user experience, accelerate test speed, central controller still includes the position indication module, and the position indication module is used for the controller display to show a real-time position display area, and real-time position display area shows the virtual image of testee, destination position to and the distance of dynamic update testee and destination position. The destination location is preferably, but not limited to, an initial distance location or a location corresponding to the distance adjustment information in the test. Specifically, as shown in fig. 7, whether there is a gap from the current position of the subject to the target position or not, or whether there is just a difference, is indicated in different patterns or different colors. Based on the real-time feedback of the graph, the tested person can clearly know how much to advance or retract. In fig. 7, a region a represents a target position, a point B represents a current position of a subject, a region C represents a region beyond the target position, and a point D represents a movement start point.

In this application scenario, in order to improve user experience and increase testing speed, preferably, the system further includes a position indicating device, where the position indicating device is connected to the central controller, and the position indicating device is used to indicate the initial distance and/or the distance adjustment information. In this application scenario, in one embodiment,

the position indicating device comprises a row of indicator lamps arranged on the ground, wherein the specific installation mode is that an installation hole is formed in the ground, the indicator lamps are arranged in the installation hole and are lower than the ground in height, the row of indicator lamps extend forward from a display, and the central controller comprises a lighting control module, wherein the working process of the lighting control module is as follows: after the initial distance is obtained, the lighting control module controls the indicator lamps with the initial distance or the distance close to the initial distance to be lighted, and the rest indicator lamps are turned off; after the distance adjustment information is obtained, the distance from the currently-lighted indicator lamp is controlled to be the same as or close to the step distance according to the distance adjustment information, the former or latter indicator lamp is lighted, and the rest indicator lamps are turned off.

In this application scenario, in another embodiment, the position indication device includes marking laser and drives marking laser pivoted steering wheel, marking laser output point facula or linear light spot, and central controller includes steering wheel control module, and steering wheel control module's working process is: setting the distance between a tested person and a display as a first distance, and establishing a corresponding relation between the steering engine rotation angle and the first distance; after the initial distance is obtained, the steering engine control module controls the steering engine to rotate, and the rotation angle of the steering engine control module corresponds to the initial distance; after the distance adjustment information is obtained, the steering engine is controlled to rotate forward or backward by an angle increment on the basis of the current rotation angle according to the distance adjustment information, and the angle increment corresponds to the step distance.

In this application scenario, the diopter test procedure includes:

step S1, setting an initial distance, enabling a tested person to stand at the initial distance, shooting a front image of the tested person through a camera, acquiring the distance between the tested person and a display based on the front image, setting the distance as a first distance, judging whether the first distance is the same as the initial distance, and prompting the tested person to adjust if the first distance is not the same as the initial distance;

step S2, if the tested person can see the visual target on the display clearly at the initial distance, the tested person indicates that the tested person has no refractive error (if the tested person carries the offset glasses, the tested person considers that the tested person has the refractive error as the offset diopter), the tested person does not need to test again, and if the tested person cannot see clearly, the tested person enters the step S3;

and step S3, if the feedback of the tested person is not clear or the error rate is larger than the error rate threshold value from the initial distance, prompting the tested person to approach the display until the feedback is clear or the error rate is smaller than the error rate threshold value, acquiring the first distance at the moment, and calculating the refractive error, namely the diopter value according to the first distance. If further fine adjustment is to be performed, step S4 is performed;

and S4, switching the optotype into a red-green background optotype, obtaining distance adjustment information line distance adjustment according to the recognition result fed back by the tested person until the red-green background optotype is seen clearly at the same time, obtaining a first distance at the moment, and obtaining a refractive error, namely a diopter value, according to the first distance.

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

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (9)

1. A self-service diopter measurement system, comprising:

the visual target display device is used for displaying visual targets to the testee;

the distance detection device is used for detecting the distance between the tested person and the sighting target;

bias glasses for providing bias diopter for the tested person;

the feedback device is used for enabling the tested person to feed back the visual target recognition result to the central controller;

the central controller is respectively connected with the feedback device and the distance detection device;

the feedback device is an operating handle, and the operating handle is connected and communicated with the central controller.

2. The self-service diopter measurement system of claim 1, wherein the distance detection device is a camera for capturing a front image of the subject, and the camera is connected to a central controller.

3. The self-service diopter measurement system of claim 1, wherein said optotype display means is a display connected to a central controller.

4. A self-service diopter measurement system according to any one of claims 1 to 3, characterized in that said offset spectacles are provided with identification marks, said identification marks being in one-to-one correspondence with the offset diopters of the offset spectacles.

5. The self-service diopter measurement system of claim 4, wherein said central controller includes an offset diopter identification module that identifies an identification mark in the front image of the subject to obtain an offset diopter of the offset eyeglasses.

6. The self-service diopter measurement system of claim 4, including left and right identification marks respectively provided on the two lenses of the offset glasses, the left identification mark being in one-to-one correspondence with the offset diopter of the left lens, the right mark being a left identification mark in one-to-one correspondence with the offset diopter of the right lens.

7. The self-service diopter measurement system of claim 5, including left and right identification marks respectively provided on the two lenses of the offset glasses, the left identification mark being in one-to-one correspondence with the offset diopter of the left lens, the right mark being a left identification mark in one-to-one correspondence with the offset diopter of the right lens.

8. The self-service diopter measurement system according to claim 5, 6 or 7, wherein the identification mark is a two-dimensional code label or a one-dimensional code label.

9. The self-service diopter measurement system of claim 1 or 2 or 3 or 5 or 6 or 7, further comprising an initial distance marker located on the ground in front of the optotype display device.