Vision testing device, method and system and non-transitory computer readable recording medium

Abstract

A visual acuity detection device, method, system and non-transitory computer readable recording medium are disclosed. The visual acuity detection device comprises a hollow housing, a converging lens disposed in the hollow housing and comprising a converging focal length, and a diverging lens disposed in the hollow housing opposite the converging lens and comprising a diverging focal length, the optical axis of the diverging lens and the converging lens overlapping each other, the diverging focal length partially overlapping the converging focal length. The visual acuity detection device attaches a detection target displayed by a display device to an end of the hollow housing adjacent to the diverging lens, the diverging lens reduces the detection target to a first virtual image within the converging focal length, and the converging lens enlarges the first virtual image to a second virtual image for visual acuity detection.

Description

TECHNICAL FIELD

[0001] The present application relates to a visual acuity detection technology, in particular to a visual acuity detection device, method, system and non-transitory computer readable recording medium. BACKGROUND

[0002] With the development of electronic devices towards multi-function and easy to carry, the time of using electronic products is getting longer and the age of starting to use electronic products is getting lower, and the problem of myopia in teenagers is getting more and more serious. After suffering from myopia, visual fatigue is easy to occur. If myopia is not corrected, long time looking at objects will cause symptoms such as inattention and dizziness, and if the severity of myopia is too high, it will also increase the incidence of eye diseases. Therefore, it is very important to detect the change of visual acuity level in time when myopia is in the early stage or short-term visual acuity decline caused by visual fatigue.

[0003] However, at present, if you want to know your visual acuity, you usually go to a hospital or an optical inspection agency such as an optical store to use professional equipment such as a computer optometry instrument for optometry. Each test requires a lot of time, transportation cost and detection cost, so the visual acuity testee cannot conveniently and timely grasp the change trend of visual acuity level.

[0004] Therefore, how to reduce or eliminate the time, transportation cost and detection cost of the visual acuity testee and conveniently and timely grasp the change trend of visual acuity level is an important subject studied by the present inventors. SUMMARY

[0005] An embodiment of the present application relates to a visual acuity detection device, comprising: a hollow shell; a converging lens arranged in the hollow shell and comprising a converging focal length; and a diverging lens arranged in the hollow shell opposite the converging lens and comprising a diverging focal length, the optical axis of the diverging lens and the converging lens overlapping each other, and the diverging focal length partially overlapping the converging focal length; wherein the visual acuity detection device is attached to a detection target displayed by a display device at one end of the hollow shell adjacent to the diverging lens, the diverging lens reduces the detection target to a first virtual image within the converging focal length, and the converging lens enlarges the first virtual image to a second virtual image for visual acuity detection.

[0006] Another embodiment of the present application relates to a binocular visual acuity detection device, comprising: the visual acuity detection device as disclosed in the embodiments of the present application, wherein a first clamping structure is arranged on the periphery of the hollow shell of each visual acuity detection device; and an auxiliary support having a second clamping structure, the auxiliary support is combined with the visual acuity detection devices by clamping the first clamping structure through the second clamping structure.

[0007] The embodiment of the present application relates to a visual acuity detection method, which is used in cooperation with the visual acuity detection device as described in the embodiment of the present application. The visual acuity detection method comprises: a display device performing image processing on a basic target with a preset pixel size by using a scaling means and generating a plurality of detection targets with pixel sizes in a multiple relationship with 5*5 pixel size and non-5*5 pixel size divisible, and performing image compensation on the detection targets with non-5*5 pixel size divisible, so that the pixel sizes between each detection target have an arithmetic sequence relationship; the display device displays the corresponding detection target according to the visual acuity level of the tested person; the visual acuity detection device is attached to the detection target for visual acuity detection; and the display device receives a response information of the tested person for visual acuity level judgment.

[0008] The embodiment of the present application relates to a non-transitory computer readable recording medium for storing a program, which can execute the visual acuity detection method as described in the embodiment of the present application when the display device loads the program.

[0009] Another embodiment of the present application relates to a visual acuity detection system, which comprises the visual acuity detection device as described in the embodiment of the present application and a display device for executing the visual acuity detection method as described in the embodiment of the present application.

[0010] Therefore, the visual acuity detection device, method, system and non-transitory computer readable recording medium of the present application can solve the technical problems of the prior art, such as the need for a fixed field, inconvenience in carrying, and the inability to conveniently and instantly grasp the change trend of the visual acuity level, and achieve the purpose of not needing a fixed field, being convenient to carry, and being able to instantly grasp the change trend of the visual acuity level.

[0011] Further, by using the image processing on the basic target and generating a plurality of detection targets with pixel sizes in an arithmetic sequence relationship and performing image compensation on the detection targets with non-5*5 pixel size divisible, the high requirement for the resolution of the display screen is effectively reduced, and the visual acuity detection device can be applied to various display devices with different resolution levels. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 FIG. 1 is a structural schematic diagram of a visual acuity detection system and a visual acuity detection device according to a first embodiment of the present application;

[0013] Figure 2 FIG. 2 is a system imaging schematic diagram of the visual acuity detection device according to the first embodiment of the present application;

[0014] Figure 3 FIG. 3 is a light path schematic diagram of the visual acuity detection device according to the first embodiment of the present application;

[0015] Figure 4Structure diagram of a second embodiment of the visual acuity detection device of the present application;

[0016] Figure 5 Structure diagram of a third embodiment of the visual acuity detection device of the present application;

[0017] Figure 6 Structure diagram of the binocular detection visual acuity detection device of the present application;

[0018] Figure 7 Flow diagram of the visual acuity detection method of the present application; and

[0019] Figure 8 Detection target image compensation diagram of the visual acuity detection method of the present application.

[0020] Among them, the reference signs are:

[0021] 1: visual acuity detection device

[0022] 10: hollow shell

[0023] 11: light shield

[0024] 12: visual cylinder

[0025] 13: first clamping structure

[0026] 20: converging lens

[0027] 30: diverging lens

[0028] 40: diaphragm

[0029] 50: attached layer

[0030] 51: hook structure

[0031] 60: display device

[0032] 70: auxiliary support

[0033] 71: second clamping structure

[0034] 72: bottom plate

[0035] 73: upper cover

[0036] L: optical axis

[0037] f1: diverging focal length

[0038] f2: converging focal length

[0039] obj1: detection target

[0040] img2: second virtual image

[0041] img1: first virtual image

[0042] S1-S5: steps

[0043] S51-S53: steps DETAILED DESCRIPTION

[0044] The present application is described in detail below with reference to the accompanying drawings and specific examples, but is not limited thereto.

[0045] Referring to Figure 1 is a structural schematic diagram of a first embodiment of a visual acuity detection system and a visual acuity detection device 1. The visual acuity detection system includes a visual acuity detection device 1 and a display device 60, which can be a smart mobile phone, a personal digital assistant, a tablet computer, or other electronic device with a display screen; the visual acuity detection device includes a hollow shell 10, a light shield 11, a viewing cylinder 12, a converging lens 20, a diverging lens 30, and an aperture 40; during visual acuity detection, the visual acuity detection device 1 is attached to the display device 60 for detection. The hollow shell 10 can be made of a light-transmitting material such as translucent or transparent, allowing light to pass through the inside to meet the indoor space illumination requirements during visual acuity detection.

[0046] The light shield 11 is connected to one end of the hollow shell 10 and adjacent to the diverging lens 30. The light shield 11 has a tapered through structure inside and gradually shrinks towards the diverging lens direction, so that the diverging lens 30 and the display screen of the display device 60 maintain a fixed distance of 30 mm, and can be used to eliminate reflected or refracted light. If necessary, a specific texture such as a stepped, sandblasted multi-convex, or other roughening method can be further provided inside the light shield 11 to enhance the elimination of reflected or refracted light; the viewing cylinder 12 is connected to the other end of the hollow shell 10 and adjacent to the converging lens 20, to maintain a fixed distance between the eyes of the subject and the converging lens 20.

[0047] Further, in the first embodiment of the present application, in order to enable the visual acuity detection device 1 to be stably attached to the display area of the display device 60, an attachment layer 50 can be added around the opening of one end of the light shield 11. The attachment layer 50 can be any one of a silicone layer, an electrostatic glass sticker, or a chemical adhesive layer, wherein the silicone layer generates stable attachment and easy removal of the visual acuity detection device 1 by high friction resistance, the electrostatic glass sticker generates stable attachment and easy removal of the visual acuity detection device 1 by electrostatic adsorption principle, and the chemical adhesive layer generates stable attachment and easy removal of the visual acuity detection device 1 by adhesive, and further enables repeated operation and use of the visual acuity detection device 1.

[0048] Referring to Figure 2 and Figure 3For the system imaging and light path schematic diagram of the visual acuity detection device of the present application, the converging lens 20 is arranged in the hollow casing 10 and has a converging focal length f2; the diverging lens 30 is arranged in the hollow casing 10 in a spaced-apart manner relative to the converging lens 20 and has a diverging focal length f1. In order to increase the range of visual acuity detection levels, the visual acuity detection device 1 of the present application is arranged such that the optical axis L of the diverging lens 30 and the converging lens 20 overlap each other in the hollow casing 10, and the diverging focal length f1 partially overlaps the converging focal length f2.

[0049] When visual acuity detection is performed, the display device 60 is started and the detection target obj1 is displayed, and the attachment layer 50 of the light shield 11 is attached around the detection target obj1, so that the light of the detection target obj1 can enter the hollow casing 10, thereby enabling the diverging lens 30 to perform reduction imaging on the detection target obj1 and generate a first virtual image img1 located in the range of the converging focal length f2. The converging lens 20 then performs magnification imaging on the first virtual image img1 to generate a second virtual image img2, wherein the imaging height of the second virtual image img2 is approximately or equal to the height of the target seen by the subject at a general indoor visual acuity detection distance of 6 meters.

[0050] Since the higher the magnification of the visual acuity detection device 1, the more difficult it will be to increase the range of visual acuity detection levels, it is necessary to appropriately set the magnification. In order to achieve optimal arrangement and improve the effect of visual acuity detection levels, the product of the magnification of the converging lens 20 and the diverging lens 30 can be between 10 and 15, the length of the visual acuity detection device 1 can be between 190 mm and 130 mm, and according to the standard of the Snellen chart, the range of visual acuity detection levels can be between 1.6 and 0.05, and at least 15 visual acuity detection levels can be designed according to the requirements. Further, the converging lens 20 can be a plano-convex lens, the diverging lens 30 can be a plano-concave lens, and the plane of the converging lens 20 and the concave surface of the diverging lens 30 are arranged in the hollow casing 10.

[0051] In order to control the beam quality of the multiple parallel light beams generated by the converging lens 20 to meet the degree of light received by the eyeball of the subject and the standard of visual acuity detection, a diaphragm 40 can be further arranged in the hollow casing 10, the diaphragm 40 is arranged between the converging lens 20 and the diverging lens 30 and adjacent to the converging lens 20, to filter out excess scattered or refracted light to adjust the angle and quantity of light entering the converging lens 20.

[0052] Please refer to Figure 4As shown in FIG. 1, it is a structural schematic diagram of the first embodiment of the visual acuity detection device 1. The first embodiment of the present application is substantially the same as the first embodiment described above, except that the peripheral surface of the light shield 11 is provided with a hook structure 51. The hook structure 51 can be tightly attached to the display device 60 (corresponding to the display device 60 shown in FIG. 2) for displaying the detection visual target obj1 (corresponding to the detection visual target obj1 shown in FIG. 2) by means of rubber bands or belts and other objects. Figure 1 , Figure 2 As shown in FIG. 1, it is a structural schematic diagram of the first embodiment of the visual acuity detection device 1. The first embodiment of the present application is substantially the same as the first embodiment described above, except that the peripheral surface of the light shield 11 is provided with a hook structure 51. The hook structure 51 can be tightly attached to the display device 60 (corresponding to the display device 60 shown in FIG. 2) for displaying the detection visual target obj1 (corresponding to the detection visual target obj1 shown in FIG. 2) by means of rubber bands or belts and other objects.

[0053] As shown in FIG. 1, it is a structural schematic diagram of the first embodiment of the visual acuity detection device 1. The first embodiment of the present application is substantially the same as the first embodiment described above, except that the peripheral surface of the light shield 11 is provided with a hook structure 51. The hook structure 51 can be tightly attached to the display device 60 (corresponding to the display device 60 shown in FIG. 2) for displaying the detection visual target obj1 (corresponding to the detection visual target obj1 shown in FIG. 2) by means of rubber bands or belts and other objects. Figure 5 As shown in FIG. 1, it is a structural schematic diagram of the first embodiment of the visual acuity detection device 1. The first embodiment of the present application is substantially the same as the first embodiment described above, except that the peripheral surface of the light shield 11 is provided with a hook structure 51. The hook structure 51 can be tightly attached to the display device 60 (corresponding to the display device 60 shown in FIG. 2) for displaying the detection visual target obj1 (corresponding to the detection visual target obj1 shown in FIG. 2) by means of rubber bands or belts and other objects.

[0054] As shown in FIG. 1, it is a structural schematic diagram of the first embodiment of the visual acuity detection device 1. The first embodiment of the present application is substantially the same as the first embodiment described above, except that the peripheral surface of the light shield 11 is provided with a hook structure 51. The hook structure 51 can be tightly attached to the display device 60 (corresponding to the display device 60 shown in FIG. 2) for displaying the detection visual target obj1 (corresponding to the detection visual target obj1 shown in FIG. 2) by means of rubber bands or belts and other objects. Figure 6 As shown in FIG. 1, it is a structural schematic diagram of the first embodiment of the visual acuity detection device 1. The first embodiment of the present application is substantially the same as the first embodiment described above, except that the peripheral surface of the light shield 11 is provided with a hook structure 51. The hook structure 51 can be tightly attached to the display device 60 (corresponding to the display device 60 shown in FIG. 2) for displaying the detection visual target obj1 (corresponding to the detection visual target obj1 shown in FIG. 2) by means of rubber bands or belts and other objects.

[0055] As shown in FIG. 1, it is a structural schematic diagram of the first embodiment of the visual acuity detection device 1. The first embodiment of the present application is substantially the same as the first embodiment described above, except that the peripheral surface of the light shield 11 is provided with a hook structure 51. The hook structure 51 can be tightly attached to the display device 60 (corresponding to the display device 60 shown in FIG. 2) for displaying the detection visual target obj1 (corresponding to the detection visual target obj1 shown in FIG. 2) by means of rubber bands or belts and other objects.

[0056] Referring to Figure 7 The flowchart of the vision detection method is shown in FIG. 1. The vision detection method is used in combination with the vision detection device 1 disclosed in the embodiments of the present application. The vision detection method includes: using the display device 60 to image process a base target with a preset pixel size by a scaling means to generate a plurality of detection targets obj1 with a pixel size that is a multiple of 5*5 pixels and can be divided by 5*5 pixels (step S1), and image compensating the detection targets obj1 with a pixel size that can be divided by 5*5 pixels, and making the pixel size between each detection target obj1 have an arithmetic sequence relationship (step S2); the display device 60 displays the corresponding detection target obj1 according to the vision level of the subject (step S3); the vision detection device 1 is attached to the detection target obj1 for vision detection (step S4); and the display device 60 receives the response information of the subject to determine the vision level (step S5).

[0057] Further to step S3, before the display device 60 displays the detection target obj1, the subject can randomly select a preset vision level, such as 0.4-0.8, to start the test according to a preset manner. In addition, the subject can first set the vision level to be tested, and then the display device 60 displays the corresponding detection target obj1 according to the set vision level to start the vision detection. The set vision level can be based on the current physical condition or the result of the previous test, without starting from the beginning, which saves the test time of the subject. The subject can set the vision level by operating the display device 60, or by other electronic devices, which is not limited herein.

[0058] In addition, the display device 60 displays the corresponding detection target obj1 and the vision level determination step in the present application means that the subject performs multiple vision detection of different vision levels during the vision detection process, and each time the vision detection is performed on the detection target obj1 of the corresponding vision level. The display device updates the next round of vision test level according to the correct response information of the subject, until the detection procedure is completed, and the vision level value corresponding to the detection target obj1 correctly answered by the subject is provided to the subject according to the last vision detection.

[0059] Further, the base visual target is a standard 100*100 preset pixel size white background black line image visual detection visual target obj1, which is first processed by the display device 60 to generate a series of different pixel sizes such as 5*5, 10*10, 15*15, …, 30*30 detection visual target obj1 images belonging to the 5*5 pixel size multiple relationship, and further image compensation is performed on the generated multiple non-5*5 pixel size detection visual target obj1 such as 6*6, 7*7, 8*8, …, 21*21, 22*22, 23*23, …, 29*29, and the pixel size of each detection visual target obj1 has an arithmetic progression relationship.

[0060] Wherein, the aforementioned image compensation is to adjust the transparency of each non-black line part of the black line image around the image black line, and the transparency adjustment will also have different colors depending on the different background colors of the display device 60, such as white, which can be adjusted to approach gray, but not limited to this; In addition, in order to match the image E pattern of the detection visual target obj1 of the Snellen visual acuity chart, the pixel size can be designed with 5*5 as the reference, but in fact it is not limited to this, and the pixel size reference can also be adjusted appropriately according to the different patterns.

[0061] Wherein, in order to optimize the effect of image compensation on the image edge, an interpolation algorithm, especially a bilinear interpolation algorithm, can be further used for image compensation by the display device 60.

[0062] In order to more effectively illustrate the image compensation method of the present application, please further refer to Figure 8 For 5*5 pixel size and 7*7 pixel size detection visual target obj1, the display device 60 uses the bilinear interpolation algorithm to adjust the transparency of the black line around the white background black line image of the detection visual target obj1 for each non-5*5 pixel size detection visual target obj1, so that the 7*7 pixel size detection visual target obj1 has a complete E pattern. The remaining non-5*5 detection visual target obj1 is generated in the same way, and will not be described here.

[0063] Since the step size of each detection visual target obj1 has a difference in visual target pixel size when it jumps one level, for example, the size of the detection visual target obj1 corresponding to visual level 0.9 is slightly larger than 10% compared to the detection visual target obj1 corresponding to visual level 1.0, but if the pixel size of the detection visual target obj1 of visual level 1.0 is defined as 5*5, the pixel size of the detection visual target obj1 of visual level 0.9 is 5.5*5.5, but the current display screen cannot display images with decimal points such as 5.5*5.5.

[0064] On the other hand, if the pixel size of the detection visual target obj1 corresponding to the visual level 1.0 is increased to 50*50, although the pixel size of the detection visual target obj1 corresponding to the visual level 0.9 can be changed to 55*55, this way can only be applied to high-resolution display screens, resulting in limited technical applications. Moreover, if the visual detection device 1 disclosed in the present application is implemented under such pixel size specification, the display screen will need a resolution of about 2180 pixels per inch, which obviously does not conform to the current screen specification of electronic devices. Therefore, the image compensation method disclosed in the present application can effectively overcome this problem and has the effect of being widely used in low-resolution display screens.

[0065] On the other hand, the response information can be any way for the display device 60 to perceive the answer of the subject, such as voice, touch, touch sliding, etc., to determine the visual level. In step S5, in order to reduce or eliminate the behavior that the subject may guess and affect the determination of the visual level, the display device 60 can further confirm whether to reduce the visual level (step S51) according to the received response information and with the record data including the response time of the subject and the error rate of the answer; if yes, the reduced visual level is displayed (step S52); if no, the calculated visual level is displayed (step S53).

[0066] It is particularly noted that the above-mentioned step S51 means that the display device 60 first performs step S5 to determine the visual level according to the perceived response information, and then further performs comprehensive calculation according to the record data including the response time of the subject and the error rate of the answer. For example, if the response time is too short, too long, or the error rate is high, it can be classified as the subject making more guesses during the visual detection, and then the result of the visual level obtained in step S5 is actively reduced by one or more levels, and the reduced visual level result is provided to the subject; if it is determined as "no", the result of the visual level of step S5 is provided.

[0067] In the embodiments disclosed in the present application, the above-mentioned visual detection method can also be presented and recorded in a non-transitory computer readable recording medium, wherein the non-transitory computer readable recording medium can be installed in the display device 60 to execute.

[0068] In summary, the vision detection device 1, the method and the system, and the non-transitory computer readable recording medium disclosed by the present application can improve the detection range of the vision level by using a lower magnification and a suitable length of the hollow housing 10. In addition, the image processing steps adopted by the vision detection method can be applied to display devices with low resolution, and can solve the technical problems of the prior art, such as the need for a fixed field, inconvenience in carrying, and the inability to conveniently and instantly grasp the change trend of the vision level, to achieve the purpose of not needing a fixed field, being convenient to carry, and being able to instantly grasp the change trend of the vision level.

[0069] Of course, the present application can also have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application. However, these corresponding changes and modifications should all belong to the protection scope of the claims attached to the present application.

Claims

1. A vision detection apparatus, characterized by, The vision testing device comprises: a hollow casing; a converging lens arranged in the hollow casing and comprising a converging focal length; a diverging lens arranged in the hollow casing opposite the converging lens and comprising a diverging focal length, the optical axis of the converging lens and the diverging lens overlapping each other, the diverging focal length partially overlapping the converging focal length; a diaphragm arranged in the hollow casing between the converging lens and the diverging lens and adjacent to the converging lens; and a light shield connected to one end of the hollow casing and adjacent to the diverging lens, the light shield having a tapered through structure and tapering towards the diverging lens; wherein the vision testing device uses the end of the hollow casing adjacent to the diverging lens to attach a detection target displayed by a display device, the diverging lens reduces the detection target to a first virtual image within the converging focal length, and the converging lens enlarges the first virtual image to a second virtual image for vision testing; the hollow casing is made of translucent or transparent material, and one end of the light shield is provided with any one of a silica gel layer, an electrostatic glass sticker or a chemical adhesive layer; the first virtual image is located at the overlapping position of the converging focal length and the diverging focal length; the converging lens is a plano-convex lens, the diverging lens is a plano-concave lens, and the plane of the converging lens is arranged opposite the concave surface of the diverging lens.

2. The vision testing apparatus of claim 1, wherein, The vision testing device has two diverging lenses arranged adjacent to each other, and each of the diverging lenses is a plano-concave lens, and the concave surfaces of the diverging lenses are arranged opposite the plane of the converging lens.

3. The vision testing apparatus of claim 2, wherein, The length of the vision testing device is 190mm-130mm.

4. The vision testing apparatus of claim 1, wherein, The periphery of the light shield is provided with a hook structure for attaching the detection target.

5. The vision testing apparatus of claim 1, wherein, The vision testing device comprises:

6. A binocular vision detection device, characterized by two vision testing devices according to any one of claims 1-5, wherein the periphery of the hollow casing of each of the vision testing devices is provided with a first clamping structure; an auxiliary support having a second clamping structure, the auxiliary support being combined with the vision testing devices by clamping the first clamping structure through the second clamping structure. The first clamping structure is a plurality of parallel grooves arranged on both sides of the hollow casing, the auxiliary support has a bottom plate and an upper cover, and the second clamping structure is a plurality of parallel grooves arranged on the bottom plate and the upper cover, respectively. When two vision testing devices are combined, the upper cover and the bottom plate clamp both sides of each hollow casing, respectively, and combine the vision testing devices by clamping the first clamping structure through the second clamping structure.

7. The stereopsis detection apparatus of claim 6, wherein A program is stored, and when a display device loads the program, the following vision testing method can be performed in combination with the vision testing device according to any one of claims 1-5:

8. A non-transitory computer-readable recording medium, characterized by comprising: A display device processes a base target with a preset pixel size by a zooming means and generates a plurality of detection targets with a pixel size that is a multiple of 5*5 and can be divided by 5*5, and performs image compensation on the detection targets that can be divided by 5*5, so that the pixel size between each detection target has an arithmetic sequence relationship; The display device displays the corresponding detection target according to the tested vision level of the tested person; ​ The visual acuity detection device is attached to the detection target for visual acuity detection; The display device receives a response from the subject to determine the visual acuity level; The display device determines whether to reduce the visual acuity level based on the response and record data including response time and error rate, and displays the result if the visual acuity level is reduced. The display device uses a bilinear interpolation algorithm to compensate for the image of each detection target; The base target and the detection targets are images with black lines, and the display device compensates for the image of the detection targets that are not divisible by 5*5 pixels by adjusting the transparency of the black line around the image; and The subject first sets the visual acuity level for visual acuity detection, and then the display device displays the corresponding detection target based on the visual acuity level set by the subject to start visual acuity detection. The visual acuity detection device of any one of claims 1 to 5; 9. A vision detection system characterized by, The display device is used to perform the visual acuity detection method as follows: The display device uses a scaling method to process the base target with a preset pixel size and generate multiple detection targets that are multiples of 5*5 pixels and are divisible by 5*5 pixels, and compensates for the images of the detection targets that are not divisible by 5*5 pixels to make the pixel size between each detection target have an arithmetic sequence relationship; The display device displays the corresponding detection target based on the subject's visual acuity level; The visual acuity detection device is attached to the detection target for visual acuity detection; The display device receives a response from the subject to determine the visual acuity level; The display device determines whether to reduce the visual acuity level based on the response and record data including response time and error rate, and displays the result if the visual acuity level is reduced. The display device uses a bilinear interpolation algorithm to compensate for the image of each detection target; The base target and the detection targets are images with black lines, and the display device compensates for the image of the detection targets that are not divisible by 5*5 pixels by adjusting the transparency of the black line around the image; and The subject first sets the visual acuity level for visual acuity detection, and then the display device displays the corresponding detection target based on the visual acuity level set by the subject to start visual acuity detection. ​ ​ ​

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