Method for matching visual training diopter switching frequency

Abstract

The invention belongs to the technical field of visual training, and discloses a method for matching visual training diopter switching frequency, which comprises the following steps of: 1, acquiring at least one first feedback signal of a user for identifying a first visual chart at a first diopter; and a second step of switching the first diopter to the second diopter and switching the first visual chart to the second visual chart in response to matching of the first feedback signal and the first visual chart. And 3, acquiring at least one second feedback signal of the second visual chart identified by the user at the second diopter. And a fourth step of switching the second diopter to the first diopter and switching the second visual chart to the third visual chart in response to matching of the second feedback signal and the second visual chart. A fifth step of repeating the first step to the fourth step until a preset time length; and step 6, counting the number of times of diopter switching and the number of times of signal feedback within a preset time, and outputting a diopter switching frequency. According to the invention, personalized diopter switching frequency can be provided.

Description

Technical Field

[0001] The present invention belongs to the technical field of vision training. More specifically, the present invention relates to a method for matching the switching frequency of refractive power in vision training. Background Art

[0002] The flip card is a common visual function training tool for relieving and treating myopia, mainly for training the accommodation sensitivity. Through continuous adjustment of the focal length of the eyeball during eye flip card training, it can stimulate the muscles around the eyeball and the nerves around the retina, improve the flexibility and accommodation ability of the eyeball, and has good training efficacy. Moreover, it has good therapeutic effects on accommodative myopia, accommodation spasm caused by long-term viewing of close distances by the eyes, and pseudo-myopia.

[0003] The flip card usually consists of a set of lenses with alternating positive and negative powers. During vision training, the user stimulates the coordinated movement of the eye muscles by quickly switching the gaze between different lenses. Specifically, the user wears corrective glasses and focuses on an eye chart at a fixed distance through the positive lens of the flip card. After clearly recognizing the chart, the user flips the card to the negative lens and tries to recognize the characters in the blurred state, and then flips it back to the positive lens again, repeating the cycle of switching the refractive power. After each flip, it is necessary to wait for the image to change from clear to blurred and then back to clear, avoiding skipping the intermediate state, and completing 6 to 8 switches per minute.

[0004] Chinese Patent ZL201420297504.X discloses an electric flip mirror, which mainly includes an integrated main mirror frame and handle, a sub-mirror frame and a motor. The sub-mirror frame is driven by the motor to flip in a direction perpendicular to the user's face. When the hyperopic lens flips to overlap with the myopic lens, the myopic lens and the hyperopic lens are coaxial front and back along the user's line of sight, and the two lenses act together. When the hyperopic lens flips to be perpendicular to the user's face, the myopic lens acts alone.

[0005] Chinese Patent ZL202420930770.5 discloses an eyepiece disc assembly, including an eyepiece disc bracket, an eyepiece disc and a motor. The middle part of the eyepiece disc is rotatably connected to the eyepiece disc bracket. The motor drives the eyepiece disc bracket to rotate in a direction parallel to the user's face, and the motor rotates the eyepiece disc, and the lens switching speed is uniform. The hyperopic lens and the myopic lens are arranged along the circumference of the eyepiece disc. When the hyperopic lens or the myopic lens is switched into the user's line of sight, the hyperopic lens or the myopic lens acts independently.

[0006] In the prior art, the switching speed of the refractive power of the flip card or the automatic flip mirror depends on mechanical structures such as gears or motors, and is usually set to different speed gears to meet the needs of different users. However, the physiological structures of different users are different, and their eye accommodation abilities are different, resulting in different required switching frequencies of refractive power. The existing technical solutions are difficult to meet the needs of different users.

[0007] In view of this, there is an urgent need for a method to match the diopter switching frequency of visual training to meet the personalized diopter switching frequency requirements of different users. Summary of the Invention

[0008] To solve at least one or more of the above-mentioned technical problems, the present invention provides a method for matching the diopter switching frequency of visual training, including: the first step of obtaining at least one first feedback signal of the user recognizing the first visual acuity chart at the first diopter; the second step of switching the first diopter to the second diopter and simultaneously switching the first visual acuity chart to the second visual acuity chart in response to the first feedback signal matching the first visual acuity chart; the third step of obtaining at least one second feedback signal of the user recognizing the second visual acuity chart at the second diopter; the fourth step of switching the second diopter to the first diopter and simultaneously switching the second visual acuity chart to the third visual acuity chart in response to the second feedback signal matching the second visual acuity chart; the fifth step of repeating the first step to the fourth step until a preset duration; the sixth step of counting the number of diopter switches and the number of signal feedbacks within the preset time, and in response to the number of diopter switches being not less than the first threshold, the diopter switching interval being not less than the second threshold, and the ratio of the number of diopter switches to the number of signal feedbacks being not less than the third threshold, outputting the diopter switching frequency according to the following formula,

[0009]

[0010] wherein,

[0011] f is the diopter switching frequency, with the unit of times per second;

[0012] n is the number of diopter switches;

[0013] T is the preset duration, with the unit of seconds;

[0014] t max is the maximum value of the diopter switching interval within the preset duration, with the unit of seconds.

[0015] According to an embodiment of the present invention, the first diopter is selected from +1.0D to +2.0D, and the second diopter is selected from -1.0D to -2.0D.

[0016] According to an embodiment of the present invention, the first visual acuity chart, the second visual acuity chart, and the third visual acuity chart are one of the Snellen chart and the Landolt ring chart.

[0017] According to an embodiment of the present invention, the first feedback signal or the second feedback signal includes at least one of: a correctness flag, a reaction time, and a fixation stability.

[0018] According to an embodiment of the present invention, the matching of the first feedback signal with the first visual acuity chart includes: the first feedback signal contains elements for correctly recognizing the first visual acuity chart.

[0019] According to an embodiment of the present invention, there is at least one of the following differences between the first visual acuity chart, the second visual acuity chart, and the third visual acuity chart: layout, density, type, character spacing, contrast, background noise.

[0020] According to an embodiment of the present invention, a blank visual acuity chart with a duration of 0.1 to 0.5 seconds is inserted between the first visual acuity chart and the second visual acuity chart; and / or a blank visual acuity chart with a duration of 0.1 to 0.5 seconds is inserted between the second visual acuity chart and the third visual acuity chart.

[0021] According to an embodiment of the present invention, by embedding a dynamic interference pattern during the diopter switching gap, it is verified whether the user actively participates in the recognition process.

[0022] According to an embodiment of the present invention, the user's eye tracking data is continuously recorded. When the user's fixation point deviates from the standard area by more than 2°, the number of diopter switching times and the number of signal feedback times are determined to be invalid.

[0023] According to an embodiment of the present invention, the preset duration is any value from 30 seconds to 180 seconds; the first threshold is any value from 3 to 10; the second threshold is any value from 1 second to 5 seconds; the third threshold is any value from 0.5 to 1.

[0024] In the present invention, by switching the diopter and collecting the user's feedback signal in real time, benchmark data can be provided for subsequent visual training. By noise filtering and eliminating unstable data, a personalized diopter switching frequency can be provided and the accuracy of the switching frequency can be ensured. Before each visual training, by immediately evaluating the user's state, the scientific nature and safety of the training can be ensured. Brief Description of the Drawings

[0025] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present invention will become readily understood. In the drawings, several embodiments of the present invention are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0026] Figure 1 A schematic diagram of the method steps for matching the diopter switching frequency of visual training is shown. Detailed Description of the Embodiments

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0028] It should be understood that the terms "comprising" and "including" used in the specification and claims of the present invention indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0029] It should also be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification and claims of the present invention, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms. It should also be further understood that the term "and / or" used in the specification and claims of the present invention refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0030] As used in this specification and the claims, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" according to the context. Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]" according to the context.

[0031] The following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings.

[0032] Figure 1 It shows a schematic diagram of the method steps for matching the diopter switching frequency of visual training.

[0033] As Figure 1As shown in the figure, a method for matching the diopter switching frequency of visual training includes: a first step S1 of obtaining at least one first feedback signal of a user recognizing a first visual acuity chart at a first diopter; a second step S2 of, in response to the first feedback signal matching the first visual acuity chart, switching the first diopter to a second diopter and simultaneously switching the first visual acuity chart to a second visual acuity chart; a third step S3 of obtaining at least one second feedback signal of the user recognizing the second visual acuity chart at the second diopter; a fourth step S4 of, in response to the second feedback signal matching the second visual acuity chart, switching the second diopter to the first diopter and simultaneously switching the second visual acuity chart to a third visual acuity chart; a fifth step S5 of repeating the first step to the fourth step until a preset duration; a sixth step S6 of counting the number of diopter switches and the number of signal feedbacks within a preset time, and in response to the number of diopter switches being not less than a first threshold, the diopter switching interval being not less than a second threshold, and the ratio of the number of diopter switches to the number of signal feedbacks being not less than a third threshold, outputting the diopter switching frequency according to the following formula,

[0034]

[0035] wherein,

[0036] f is the diopter switching frequency, with the unit of times per second;

[0037] n is the number of diopter switches;

[0038] T is the preset duration, with the unit of seconds;

[0039] t max is the maximum value of the diopter switching interval within the preset duration, with the unit of seconds.

[0040] The present invention is applied to the preparatory stage before a user conducts visual training. By using a detection tool to obtain the personalized feedback information of the user, and through screening and statistics to obtain the basic visual reaction speed and accuracy data of the user, and based on this, formulate a diopter switching frequency suitable for a specific user.

[0041] In the first step S1 to the fourth step S4 of the present invention, a first diopter and a first visual acuity chart are provided to the user, and the user recognizes the first visual acuity chart at the first diopter. Here, the recognition refers to the process of the view changing from blurred to clear, and the user gives feedback on their recognition result and emits at least one first feedback signal. When the first feedback signal does not match the first visual acuity chart, there is no need to switch the diopter, and the user will, according to the state of no diopter switching, emit a second first feedback signal again, and so on, until the first feedback signal emitted by the user matches the first visual acuity chart, and then the diopter is switched, that is, the first diopter is switched to the second diopter.

[0042] The user identifies the second visual acuity chart at the second diopter. Similarly, the user's identification of the second visual acuity chart also goes from blurry to clear, and at least one second feedback signal is sent until the second feedback signal matches the second visual acuity chart. At this time, the diopter switching method is to switch back from the second diopter to the first diopter. This process repeats, and the diopter continuously switches between the first diopter and the second diopter. During the process from the first step to the fourth step, the visual acuity chart switches from the first visual acuity chart to the second visual acuity chart and then to the third visual acuity chart, indicating that different visual acuity charts are presented to the user with each diopter switch, that is, at least the visual acuity charts before and after each diopter switch are different.

[0043] The first diopter and the second diopter refer to two different diopters required during visual training. In the present invention, they are predetermined and switched back and forth between them. Their function is to serve as the benchmark conditions for training by optically correcting or simulating different visual states (such as myopia, hyperopia). The first diopter is selected from +1.0D to +2.0D, and the second diopter is selected from -1.0D to -2.0D. Preferably, the first diopter is +2.0D and the second diopter is -2.0D.

[0044] The first visual acuity chart, the second visual acuity chart, and the third visual acuity chart are visual acuity charts with different display contents, used to enable the user to identify from blurry to clear, and different visual acuity charts are synchronously switched each time the diopter is switched. The visual acuity chart is a standardized visual acuity test chart initially displayed, used to quantify the user's current visual acuity level and provide a repeatable test benchmark. Preferably, at least one of the following different characteristics exists between different visual acuity charts such as the first visual acuity chart, the second visual acuity chart, and the third visual acuity chart: layout, density, type, character spacing, contrast, background noise. Preferably, the first visual acuity chart, the second visual acuity chart, and the third visual acuity chart are one of the Snellen chart and the Landolt ring chart.

[0045] The first feedback signal and the second feedback signal refer to the feedback signals actively sent by the user after identifying the visual acuity chart. For example, signals formed by actions such as clicking, touching, and voice belong to the response data for the identification of the visual acuity chart and include behavioral, physiological, and cognitive indicators. The first feedback signal or the second feedback signal includes at least one of: a correctness flag, a reaction time, and a fixation stability. The feedback signals are divided into two types: correct feedback signals and incorrect feedback signals.

[0046] For example, when the user successfully identifies the content of the first visual acuity chart, a first feedback signal is sent by clicking on a specific area of the first visual acuity chart, making the first feedback signal match the first visual acuity chart, and the first feedback signal is a correct feedback signal.

[0047] For another example, when the user fails to recognize the content of the first visual acuity chart and clicks in an area outside the specific area of the first visual acuity chart to send a first feedback signal, making the first feedback signal not match the first visual acuity chart, the first feedback signal is an incorrect feedback signal.

[0048] Based on this, when the user recognizes the first visual acuity chart, at least one first feedback signal can be sent. For example, when the user successfully recognizes the first visual acuity chart for the first time, only one first feedback signal is needed to trigger the switching of the diopter.

[0049] For another example, if the user fails to recognize the first time and succeeds the second time, the user will send two first feedback signals. Among them, the feedback signal sent for the first time does not match the first visual acuity chart and cannot trigger the switching of the diopter. It is not until the feedback signal sent for the second time that the switching of the diopter is triggered. In addition, the user can also be prompted to send a feedback signal again by means of sound, light, electricity, magnetism, etc.

[0050] The first feedback signal matching the first visual acuity chart includes: the first feedback signal contains the elements for correctly recognizing the first visual acuity chart.

[0051] The first feedback signal, the second feedback signal, and the feedback signals sent by the user after subsequent diopter switching can adopt any one or more signal forms such as sound, light, electricity, and magnetism that can carry information. During the process from the first step to the fourth step, after each diopter switching, the user sends at least one feedback signal.

[0052] In the fifth step, the preset duration refers to the duration for obtaining the personalized feedback information of the user and can be set differently according to needs. For example, 30s, 60s, 120s, 180s, etc. or any value between 30 seconds and 180 seconds. After continuously cycling and switching between the first diopter and the second diopter, a sufficient amount of feedback signals of the user are obtained.

[0053] Among the obtained feedback signals, such as the first feedback signal, the second feedback signal, etc., at least one of the correctness flag, reaction time, and fixation stability is included. Among them, the correctness flag refers to whether it is correctly recognized, such as pressing the corresponding button. The reaction time refers to the time from the presentation of the visual acuity chart to the confirmation of the button press. The fixation stability refers to the standard deviation of pupil displacement. For example, σ≤2mm is considered stable.

[0054] In the sixth step, first, noise filtering is performed to eliminate unstable data. For example, feedback signals sent by the user due to misoperation, feedback signals sent due to timeout operation, interference of extreme values, etc. Specifically, count the number of diopter switching times and signal feedback times within the preset time, and calculate the number of diopter switching times. In the present invention, the first threshold sets the lower limit of the diopter switching times, the second threshold sets the lower limit of the diopter switching speed, and the third threshold sets the lower limit of the recognition accuracy.

[0055] When the number of diopter switches is less than the first threshold within the preset duration, it is determined that the user's operation times out, and the acquired data is invalid and does not participate in the calculation of the diopter switching frequency. For example, the first threshold is set to any value between 3 and 10.

[0056] When the diopter switching interval is less than the second threshold within the preset duration, it is determined that the user has made a misoperation, and the operation gap exceeds the limit response time for the eyes to see clearly from blurred. For example, the second threshold is set to any value between 1 second and 5 seconds.

[0057] When the ratio of the number of diopter switches to the number of signal feedbacks is less than the third threshold within the preset duration, it is determined that the user has too many recognition failures, and the authenticity of the acquired data is doubtful and does not participate in the calculation of the diopter switching frequency. For example, the third threshold is set to any value between 0.5 and 1.

[0058] In addition, noise filtering can also be performed according to the correctness flag. For example, the correctness flag needs to satisfy both: the fixation point is located in the central area of the eye chart (error ≤ 5% of the field of view), and the response time is within a reasonable range (such as 0.5s to 2s).

[0059] Preferably, visual fatigue can also be restored by using a blank eye chart. Specifically, a blank eye chart lasting for 0.1 to 0.5 seconds is inserted between the first eye chart and the second eye chart; and / or a blank eye chart lasting for 0.1 to 0.5 seconds is inserted between the second eye chart and the third eye chart.

[0060] Preferably, a dynamic interference pattern can also be embedded during the diopter switching interval to verify whether the user actively participates in the recognition process. According to the user's operation of eliminating the dynamic interference pattern, it is determined that the current data is valid, and according to the user's operation of not eliminating the dynamic interference pattern, it is determined that the current data is invalid.

[0061] Preferably, the user's eye tracking data can also be continuously recorded. When the user's fixation point deviates from the standard area by more than 2°, the number of diopter switches and the number of signal feedbacks are determined to be invalid.

[0062] In the sixth step, the diopter switching frequency is output according to the following formula

[0063]

[0064] where

[0065] f is the diopter switching frequency, with the unit of times per second;

[0066] n is the number of diopter switches;

[0067] T is the preset duration, with the unit of seconds;

[0068] t max is the maximum value of the diopter switching interval within the preset duration, in seconds.

[0069] Among them, n - 1 means removing the maximum value t of the diopter switching interval within the preset duration T once max , which can reduce the influence of extreme values and improve the reliability of data.

[0070] According to an embodiment of the present invention, during the initial detection, personalized data of the user or an instruction input by the user is obtained to determine the parameters of the eye chart. The parameters at least include at least one of font size, color, contrast, and brightness. For example, different font sizes are set according to different user ages.

[0071] According to an embodiment of the present invention, during the implementation of the first step to the fourth step, the personalized feedback information acquisition system of the user can be completed by an acquisition system composed of a chip loaded with a computer program. For example, the user observes the eye chart through a head-mounted display device, presses the response button to confirm successful recognition, the acquisition system obtains the feedback signal in real time, controls the diopter switching and eye chart switching of the head-mounted display device, and counts the number of diopter switches, the number of signal reflections, etc., and completes the calculation recorded in the sixth step, outputs the diopter switching frequency, and generates a personalized training plan.

[0072] During the diopter switching control process, it can be achieved by flipping the lens or controlling the diopter of the liquid lens.

[0073] Preferably, the acquisition system can also track the position of the eye's focus in real time to assist in eliminating noise data. More preferably, it can also verify whether the user actively participates in the recognition process by embedding random blank frames or dynamic interference patterns.

[0074] In the present invention, the acquisition system also includes using the PTP (Precision Time Protocol) to ensure that the clock error of each device is <1ms to prevent timing confusion between multiple devices. Check the remaining training time every 200ms and trigger a gradually increasing prompt tone (frequency linearly rising from 200Hz to 1kHz) 30 seconds in advance.

[0075] In the present invention, by switching the diopter and collecting the feedback signal of the user in real time, benchmark data can be provided for subsequent visual training. By filtering noise and eliminating unstable data, the personalized diopter switching frequency can be provided and the accuracy of the switching frequency can be guaranteed. Before each visual training, by immediately evaluating the user's state, the scientific nature and safety of the training can be ensured.

[0076] Although several embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many changes, alterations, and alternative forms will occur to those skilled in the art without departing from the spirit and scope of the present invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. The appended claims are intended to define the scope of the present invention and thereby cover equivalents or alternatives within the scope of these claims.

Claims

1. A method for matching the switching frequency of visual training diopter, characterized in that: include: The first step is to obtain at least one first feedback signal of a user identifying a first vision chart at a first diopter; The second step is, in response to the first feedback signal matching the first vision chart, switching the first refractive power to the second refractive power, and switching the first vision chart to the second vision chart; The third step is to obtain at least one second feedback signal of the user identifying the second vision chart at a second diopter; The fourth step is, in response to the second feedback signal matching the second vision chart, switching the second refractive power to the first refractive power, and switching the second vision chart to the third vision chart; Step 5, repeating steps 1 to 4 until the preset time. The sixth step is to count the number of diopter switching times and the number of signal feedback times within a preset time, and in response to the number of diopter switching times being not less than the first threshold, the diopter switching interval being not less than the second threshold, and the ratio of the number of diopter switching times to the number of signal feedback times being not less than the third threshold, output the diopter switching frequency according to the following formula: in, f is the diopter switching frequency, in times / second; n is the number of diopter switching times; T is the preset duration, in seconds; t max It is the maximum value of the diopter switching interval within the preset time, in seconds.

2. The method according to claim 1, characterized in that The first refractive power is selected from +1.0D to +2.0D, and the second refractive power is selected from -1.0D to -2.0D.

3. The method according to claim 1, characterized in that The first step also includes: obtaining the user's personalized data or obtaining the instructions input by the user, and determining the parameters of the first vision chart, wherein the parameters include at least one of font size, color, contrast and brightness.

4. The method according to claim 1, characterized in that: The first feedback signal or the second feedback signal includes at least one of: a correctness flag, a reaction time, and gaze stability.

5. The method according to claim 1, characterized in that The first feedback signal matches the first vision chart, including: the first feedback signal contains elements for correctly identifying the first vision chart.

6. The method according to claim 1, characterized in that There is at least one of the following differences between the first vision chart, the second vision chart and the third vision chart: layout, density, type, character spacing, contrast, and background noise.

7. The method according to claim 1, characterized in that Insert a blank eye chart lasting 0.1 to 0.5 seconds between the first eye chart and the second eye chart; And / or insert a blank eye chart lasting 0.1 to 0.5 seconds between the second eye chart and the third eye chart.

8. The method according to claim 1, characterized in that By embedding dynamic interference patterns in the diopter switching gap, it is verified whether the user actively participates in the recognition process.

9. The method according to claim 1, characterized in that: The user's eye tracking data is continuously recorded. When the user's gaze point deviates from the standard area by more than 2°, the number of diopter switching and signal feedback are determined to be invalid.

10. The method according to claim 1, characterized in that The preset duration is any value between 30 seconds and 180 seconds; The first threshold is any value between 3 and 10; The second threshold is any value between 1 second and 5 seconds; The third threshold is any value between 0.5 and 1.

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