Method and device for detecting diopter and related system

[0070] The exemplary embodiments will be described in detail here, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present invention. Rather, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0071] The technical solution provided by the embodiments of the present disclosure involves two parties: a detection terminal and an observation tube. The detection terminal may be, for example, a mobile phone, a tablet computer, a notebook computer with a touch screen, a desktop computer monitor, etc. Information plays the role of transmission, transfer, calculation and storage. The observation tube, also called the optical observation tube, is installed on the touch screen of the detection terminal. The testee can observe the content displayed on the touch screen of the detection terminal through the lens barrel, such as alignment markings or alignment patterns.

[0072] After the optical observation barrel is successfully installed and fixed on the touch screen, the screen needs to be able to accurately identify the installation position of the optical observation barrel, so that the left and right separated patterns are displayed separately along the central partition in the barrel. The embodiments of the present disclosure do not limit the specific structure of the optical observation lens barrel.

[0073] The embodiment of the present invention provides a method for detecting diopter, refer to figure 1 As shown, the following steps S101 to S103 may be included;

[0074] S101: Detect the light deflection angle of the observation pattern at the preset position on the screen and the relative position of the left and right branches of the observation pattern;

[0075] S102. According to the distance between the two slits on the observation tube on the outside of the screen and the optical axis of the observation tube, the distance between the two slits and the optical axis of the observation tube is equal; The ratio of the distance, the ratio is the diopter;

[0076] S103: Determine the sign of the diopter according to the positions of the two slits of the observation tube and the relative positions of the left and right parts of the observation pattern.

[0077] The following is a detailed description of the above steps:

[0078] The observation pattern in step S101 is the target pattern observed by the testee during optometry. The pattern is divided left and right by the central partition in the lens barrel to form left and right parts, which are referred to as the left part for convenience in the following description. And the right part, you can observe the relative position of the left part and the right part displayed by the mark pattern. Reference Figure 2A , 2B As shown in 2C, two slits centered on the optical axis are set in front of the subject’s eyes. The light incident to the eye is blocked by the slits and divided into two beams and enters the eye. If the subject’s eyes are normal, pass the optical observation tube Observe the benchmark pattern, such as Figure 2A As shown, these two rays will be focused on the retina.

[0079] If the subject's eyes have negative refractive power (myopia), the two beams of light will converge in front of the retina and form two light spots or bands on the retina after viewing the target pattern through the optical observation tube. Reference Figure 2B As shown, the light incident from the lower slit is imaged above the optical axis on the retina after crossing, and the light incident from the upper slit entering the retina is imaged below the optical axis after crossing.

[0080] Similar, refer to Figure 2C As shown, if the subject’s eyes have positive refractive power (farsightedness), the two optical fibers will converge behind the retina. Similar to the case of myopia, the subject will also see two light spots or light bands, but their up and down The relationship is the opposite of myopia.

[0081] Based on this, refer to Figure 3A Shown, adjust Figure 2B The inclination angle of the two rays of light passing through the slit (the angle between the horizontal line). After the two rays of light enter the subject’s eyeballs, the change in the inclination angle can compensate for the negative refractive power of the subject’s eyes. Make the two beams of light overlap again on the subject's retina. Obviously, there is a definite correspondence between the inclination angle of the incident light and the diopter that the subject's eyes need to compensate. The greater the diopter of the subject, the greater the angle of inclination of the incident light to compensate. It can also be adjusted Figure 2C The inclination angle of the two rays of light passing through the slit (the angle between the horizontal line) is used for positive diopter (farsightedness) diopter compensation, only the incident light needs to be inclined in the opposite direction.

[0082] In this embodiment, the tilt angles of the two light rays listed are the same and symmetrical. In a specific embodiment, only one of the light beams or two light beams can be tilted at different angles to achieve the same compensation effect, such as Figure 3A The middle α is 15°, and the two rays are inclined at the same angle of 15°. In actual operation, such as myopia, refer to Figure 3B As shown, the upwardly inclined beam can be inclined by 20° and the downwardly inclined beam by 10°; it is also possible to tilt the upwardly inclined beam by 30° without the other beam being inclined. The embodiments of the present disclosure do not limit this.

[0083] Observe the relative position of the left and right parts of the pattern in step S101, refer to Figure 4A , 4B , 4C, for example, the observation pattern is a capital letter "A", in the display area of ​​the touch screen, in the vertical direction, it can be divided into three cases, refer to Figure 4A As shown, one is left-right alignment without misalignment display, refer to Figure 4B As shown, the second type is right high and left low display, refer to Figure 4C As shown, the third type is left high and right low display.

[0084] In step S102, the two slits can be arranged on the observation tube, the position of the two slits and the distance between the two slits and the optical axis, refer to Figure 3A As shown, the distance between the optical axis and each slit is h, where the value range of h is greater than or equal to 1mm and less than or equal to 4mm. When h is less than 1mm, the accuracy of measuring diopter is poor, and when h is greater than 4mm , Which exceeds the pupil diameter of a normal human eye, and the subject can only see one beam of light, so measurement is impossible. h can be a pre-designed parameter of the optical observation barrel.

[0085] In S102, the light deflection angle of the observation pattern is compared with, for example, the distance between the slit in the optical observation lens barrel and the optical axis, and referring to Formula 1, the ratio is the diopter of the eye of the subject.

[0086] Formula one:

[0087] D=α/h

[0088] Among them: D is the diopter, α is the light deflection angle, h is the distance between the slit and the optical axis, h≠0.

[0089] In S103, for example, according to the design position of the two slits in the optical observation lens barrel and the relative position of the left and right parts of the picture observed on the touch screen, it is finally determined whether the refractive power calculated in S102 is positive refractive power (far vision) or negative refractive power. (myopia).

[0090] In one embodiment, the preset positions of the two slits are still taking the optical observation lens barrel as an example. Figure 5A As shown, the two slits are arranged on both sides with the optical axis as the center. They can also be reference Figure 5B As shown, two slits are arranged on both sides with the optical axis as the center. In the above two cases, it is centered on the optical axis, parallel to the first reference line preset by the lens barrel, distributed up and down, and perpendicular to the second reference line preset by the lens barrel, distributed left and right; The first reference line is perpendicular to the preset second reference line.

[0091] In an embodiment, step S103 determines the sign of the diopter according to the positions of the two slits of the observation tube and the relative positions of the left and right parts of the observation pattern, including two situations:

[0092] The first type: reference Figure 5A As shown, for example, when the two slits in the optical observation lens barrel are designed with high right and low left, the subject uses the lens barrel to observe the pattern and move the pattern on the touch screen until the subject thinks that the left and right patterns are aligned:

[0093] 1. If the observation pattern presents high right and low left, refer to Figure 4B As shown, the above ratio is positive refractive power, that is, hyperopia;

[0094] 2. If the observation pattern is high left and low right, refer to Figure 4C As shown, the above ratio is a negative refractive power, that is, myopia.

[0095] The second type: reference Figure 5B As shown, for example, when the two slits in the optical observation lens barrel are designed with high left and low right, the subject uses the lens barrel to observe the pattern and move the pattern on the touch screen until the subject thinks that the left and right patterns are aligned:

[0096] 1. If the observation pattern is high right and low left, refer to Figure 4B As shown, the above ratio is negative refractive power, that is, myopia;

[0097] 2. If the observation pattern is high left and low right, refer to Figure 4C As shown, the above ratio is a positive refractive power, that is, hyperopia.

[0098] Reference Image 6 Shown is the judgment flowchart of the above embodiment:

[0099] S601: Determine the positive or negative of the aforementioned diopter according to the positions of the two slits and the relative positions of the left and right parts of the observation pattern;

[0100] S602. Judge the design parameters of the two slits; if the slit is high on the right and low on the left, execute S603; if the slit is high on the left and low on the right, execute S604;

[0101] S603. Determine the position of the observation pattern; if the pattern is high right and low left, execute S605, if the pattern is high left and low right, execute S606;

[0102] S604. Determine the position of the observation pattern; if the pattern is high right and low left, execute S606, if the pattern is high left and low right, execute S605;

[0103] S605. Obtain a positive refractive power;

[0104] S606: Obtain negative refractive power.

[0105] In one embodiment, the above example is used to illustrate that when the user observes the pattern displayed on the screen through the observation tube, the two patterns are moved up and down through touch sliding, mechanical adjustment, or other methods to achieve the purpose of alignment.

[0106] Receive the user's instruction to adjust the observation pattern at the preset position of the screen, and directly adjust and measure the inclination angle of the incident beam through the convex lens in the optical observation barrel according to the instruction, and then obtain the vertical direction of the observed pattern. Displacement distance, the distance between the convex lens and the touch screen, and the focal length of the convex lens; calculate the above-mentioned light deflection angle.

[0107] In one embodiment, for example, the actual distance b of the up and down displacement of the observation pattern is obtained, the distance s between the convex lens and the touch screen with known optical parameters, the focal length f of the convex lens, and the light deflection angle α is calculated.

[0108] The light deflection angle α in this embodiment can be calculated with reference to the following formula:

[0109]

[0110] Where a is the distance between two observation slits (height difference), b is the distance between left and right misaligned patterns (height difference), s is the distance between the screen and the convex lens, and f is the focal length of the convex lens.

[0111] In an embodiment, the vertical displacement distance of the observation pattern is obtained in the following manner:

[0112] Calculate the number of pixels that are misaligned in the vertical direction of the observation pattern; obtain the displacement distance of the observation pattern according to the number of pixels and the resolution of the touch screen.

[0113] In this embodiment, the moving distance of the pattern on the touch screen is in pixels. The pixel density of different models of touch screens is generally different, and the pixel density is traditionally expressed by the number of pixels (Pixels Per Inch, ppi). For example, the pixel density of the Apple 7 mobile phone is 326ppi, so if we move the pattern on the Apple 7 mobile phone, and then they are dislocated by 5 pixels, the actual physical distance of movement is 5/326 = 0.0153374 inches. That is 0.38957 mm. The actual physical distance of this dislocation is obtained. That is the b value mentioned in the above example. Because the number of pixels moved is operated by the user by sliding the touch screen, for example, this value can be obtained. As long as the ppi value of the screen is known, the actual physical distance b mentioned above can be calculated.

[0114] In one embodiment, the resolution of the above touch screen is obtained in the following manner:

[0115] For example, the ratio of the number of pixel points between the two coordinate points on the screen where the observation tube touches the screen and the physical distance between the two coordinate points can be calculated.

[0116] Another example is to obtain the physical parameters of the touch screen; the physical parameters include the resolution of the touch screen; the resolution of the screen on the detection device can be obtained in a wireless manner; for example, through infrared, Bluetooth, and Near Field Communication (NFC) ), WLAN (Wireless Local Area Network), zigbee, CDMA, GSM, TD-SCDMA, etc. establish connections with optometry instruments to transmit information (resolution information). Of course, it is not limited to the above method.

[0117] In this embodiment, when the resolution is obtained by calculation, for example, an optical observation lens barrel is installed on a touch screen, and the lens barrel senses changes in the electrostatic field on the touch screen through an induction anchor at the bottom. Reference Figure 7 As shown, a plurality of (more than or equal to 2) sensing anchors 11 made of conductive silica gel or other materials that can cause the touch screen to respond are provided on the surface where the optical observation lens barrel 1 contacts the touch screen 2. The sensing anchors 11 are connected to each other through conductive components inside the optical observation barrel, and connected to the sensing components 12 made of conductive materials exposed on the surface of the optical observation barrel, such as touch areas or touch buttons.

[0118] When the subject touches the sensing component 12 with the hand or other parts of the body, the electrical conductivity of the human body causes a small change in the electrostatic field in space. The change is conducted to the sensing anchor 11 at the bottom of the optical observation barrel through the conductive material, thereby causing the touch screen 2 to sense. The touch screen can accurately calculate the resolution of the screen by recording the position information of the points that cause induction on the touch screen 2 and knowing the pre-installed position of the induction anchor 11 on the optical observation lens barrel 1 in advance.

[0119] For example, three induction anchors installed under the designed lens barrel, the side length of the triangle formed is a design parameter, which is a fixed value a (in millimeters). Then when the lens barrel is installed on an arbitrary touch screen, the position of the three induction anchors on the screen can be captured, and the side length Ap (pixel distance) of the triangle formed by them on the screen can be calculated through the position information. ), the resolution of the screen is Ap/a (unit is pixels per millimeter).

[0120] To take a further example, suppose that the length of the triangle side between the three induction anchors, that is, the distance between the three sensing anchors, is designed to be 1 inch when the lens barrel is designed. Then when the lens barrel is installed on an Apple 7 mobile phone, if the distance between the three sensing anchors is calculated by the position information, it is 326 pixels. Then you know that the resolution or pixel density of this screen is 326ppi. If you change the length unit to mm, it will be 12.8346pixel per mm. Assuming that the same lens barrel is installed on a Samsung Galaxy 7 mobile phone, the calculated distance between the three sensing anchor points may be 441 pixels. In the same way, the resolution of Samsung Galaxy 7 is 441ppi.

[0121] A detailed and complete example is used to illustrate the method for detecting diopter provided by this embodiment:

[0122] For example, the bottom surface of the optical observation lens barrel is installed on the touch screen, and the user touches the touch area on the lens barrel. The electrostatic field changes caused by the touch process are conducted to the three induction anchors at the bottom of the lens barrel through the conductive structure inside the lens barrel. Therefore, the touch display screen senses the touch response of the three sensing anchor points, and returns the position of the three sensing anchor points in the touch display coordinate system (in pixels); the position of the sensing anchor point is used to calculate the optical observation tube The position installed on the touch screen, and according to this position as the origin of the coordinates, the left and right misaligned image is displayed to the subject. At the same time, the resolution of the touch screen can be calculated according to the position of the sensing anchor point.

[0123] Reference Figure 8 As shown, when the user observes the target pattern on the touch screen through the lens barrel, according to their own eyes, use touch gestures or other operation methods to move the left and right misalignment images displayed on the touch screen to increase or decrease the misalignment distance . Until the user observes that they are aligned through the optical measurement system.

[0124] When the user observes the left-right alignment of the image through the lens barrel, the image on the touch screen may be misaligned according to the type and degree of the user's eye refractive error. Assuming that the misalignment interval is b (in pixels), the dislocation interval b is divided by With the touch screen resolution calculated above, the physical distance (in millimeters) of the actual misalignment of the left and right images is obtained.

[0125] Use this misalignment distance and other optical measurement system design parameters (the distance between the convex lens and the touch screen and the focal length of the convex lens, the distance between the two slits and the optical axis, the design method of the position of the two slits) to calculate the light For the deflection angle, the user’s eye diopter can be calculated finally according to the above formula 1.

[0126] In the method for detecting diopter provided by this embodiment, the measured diopter is the diopter along the direction of image displacement. In this case, the diopter in the vertical direction. In the case of astigmatism in the subject’s eyes, for example, it is necessary to rotate the entire optical observation tube including the touch screen around the optical axis of the eye and perform multiple measurements (for example: rotate 90 degrees and move the misalignment pattern in the horizontal direction, rotate 45 degrees Move diagonally, etc.). Comparing the changes of the diopter measurement results under different rotation angles, the astigmatism and astigmatism axis of the measured user can be calculated.

[0127] Based on the same inventive concept, the embodiment of the present invention also provides a device for detecting diopter. Since the principle of the problem solved by the device for detecting diopter is similar to the method for detecting diopter in the foregoing embodiment, the implementation of the device for detecting diopter You can refer to the implementation of the aforementioned method, and the repetition will not be repeated.

[0128] The following is a device for detecting diopter provided by an embodiment of the present invention, which can be used to implement the above-mentioned embodiment of the method for detecting diopter.

[0129] Reference Picture 9 As shown, the above-mentioned device for detecting diopter includes:

[0130] The detection module 91 is configured to detect the light deflection angle of the observation pattern at a preset position on the screen and the relative position of the left and right branches of the observation pattern;

[0131] The calculation module 92 is configured to calculate the light deviation according to the distance between the two slits on the observation tube outside the screen and the optical axis of the observation tube, and the distance between the two slits and the optical axis of the observation tube is equal; The ratio of the folding angle to the distance, where the ratio is the diopter;

[0132] The determining module 93 is configured to determine the positive or negative of the diopter according to the positions of the two slits of the observation tube and the relative positions of the left and right parts of the observation pattern.

[0133] In an embodiment, the positions of the two slits preset in the determining module 93 include:

[0134] The two slits are arranged on both sides with the optical axis as the center; or

[0135] Two slits are arranged on both sides with the optical axis as the center.

[0136] In one embodiment, the determining module 93 is specifically configured to determine the relative positions of the left and right parts of the observation pattern when the two slits are high on the right and low on the left; If the observation pattern is low, the ratio is positive diopter; if the observation pattern is high on the left and low on the right, the ratio is negative diopter; or when the two slits are high on the left and low on the right, according to the position of the observation pattern; if the observation If the pattern is high on the right and low on the left, the ratio is negative diopter; if the observed pattern is high on the left and low on the right, the ratio is positive diopter.

[0137] In one embodiment, the detection module 91 refers to Picture 10 Shown, including:

[0138] The receiving submodule 911 is configured to receive an adjustment instruction for adjusting the observation pattern of the preset position on the screen sent by the user;

[0139] The obtaining sub-module 912 is configured to obtain the vertical displacement distance of the observation pattern after adjustment, the distance between the observation tube-convex lens and the screen, and the focal length of the convex lens according to the adjustment instruction received by the receiving sub-module;

[0140] The calculation sub-module 913 is used to calculate the light deflection angle.

[0141] In an embodiment, the calculation submodule 913 is further configured to calculate the light deflection angle according to the following formula:

[0142]

[0143] Where a is the distance between two observation slits (height difference), b is the distance between left and right misaligned patterns (height difference), s is the distance between the screen and the convex lens, and f is the focal length of the convex lens.

[0144] In an embodiment, the vertical displacement distance of the observation pattern of the acquiring sub-module 911 is acquired in the following manner:

[0145] Calculating the number of pixels that are misaligned in the vertical direction of the observation pattern;

[0146] According to the number of pixels and the resolution of the touch screen, the displacement distance of the observation pattern is obtained.

[0147] In an embodiment, the resolution obtained by the obtaining submodule 911 is obtained in the following manner:

[0148] Calculate the ratio of the number of pixels between the two coordinate points in the observation tube contacting the screen to the physical distance between the two coordinate points; or

[0149] Obtain the resolution of the screen on the detection device according to the wireless method.

[0150] Regarding the device for detecting diopter in the above-mentioned embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment of the method, and will not be elaborated here.

[0151] According to a third aspect of the embodiments of the present disclosure, an embodiment of the present invention provides a system for detecting diopter, including: an observation tube and a detecting terminal; the detecting terminal includes a screen and a device for detecting diopter as in any of the above embodiments;

[0152] The observation tube is adsorbed on the screen, and the screen is used to display an observation pattern.

[0153] Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may be in the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) containing computer-usable program codes.

[0154] The present invention is described with reference to flowcharts and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing equipment to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment can be generated In the process Figure one Process or multiple processes and/or boxes Figure one A device with functions specified in a block or multiple blocks.

[0155] These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device. The device is implemented in the process Figure one Process or multiple processes and/or boxes Figure one Functions specified in a box or multiple boxes.

[0156] These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment. Instructions are provided to implement the process Figure one Process or multiple processes and/or boxes Figure one Steps of functions specified in a box or multiple boxes.

[0157] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.