Device for biofeedback training with an eye tracker
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI ZHENSHI EYE CLINIC CO LTD
- Filing Date
- 2025-04-16
- Publication Date
- 2026-06-26
Smart Images
Figure CN224403965U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vision correction technology, and more specifically, to a device for biofeedback training using an eye tracker. Background Technology
[0002] Amblyopia is a common visual development disorder in children, mainly characterized by visual acuity that is still lower than the normal level for children of the same age, even when wearing the most suitable glasses. Amblyopia not only reduces a child's vision and affects daily life, such as reading and driving, but also has a negative impact on a child's learning and psychology. Children may encounter difficulties in learning due to vision problems, which may lead to feelings of inferiority.
[0003] Utility model patent CN209662144U discloses an amblyopia training and rehabilitation device, belonging to the technical field of eye training equipment. It includes a base with a slide rail on it, a control box on one side of the slide rail connected to a power source, control buttons and a touch screen on the control box, a freely sliding slide table on the slide rail, a threaded screw inserted into the slide table, one end of the screw rotatably connected to the base, and the other end connected to a drive device, a housing on the slide table containing LED lights and sensors, slots and through holes on the housing, a pen inserted into the slot, a rotating wheel rotatably connected to the housing above the through holes, and several evenly distributed insertion holes on the rotating wheel that mate with the through holes. The slots are located on one side of the rotating wheel and the insertion holes mate with the pen. The control box is electrically connected to the touch screen, control buttons, drive device, LED lights, sensors, and power source.
[0004] Although this invention avoids the problems of lost beads being difficult to find and the dangers of threading needles, thus improving the safety of practice, it does not maintain a constant light intensity in the training device. Both excessively strong and insufficient ambient light may interfere with the training process. Excessively strong ambient light may obscure the light emitted by the LED light group in the device, greatly reducing the effectiveness of piercing training guided by monochromatic or polychromatic light. Patients may find it difficult to clearly distinguish different colors of light. In environments with insufficient light, patients may have difficulty seeing the piercing pen, piercing holes, and rotating wheels, leading to reduced accuracy and efficiency of piercing training, increased failures, and a decrease in training motivation. Utility Model Content
[0005] The purpose of this invention is to provide a device for biofeedback training using an eye tracker, in order to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] A device for biofeedback training using an eye tracker includes a visual acquisition module, a dynamic stimulation module, a data processing control module, and a biofeedback module. The visual acquisition module includes an infrared camera, a light source control unit, and a mechanical adjustment unit. The light source control unit includes a light intensity detection circuit, an analog-to-digital converter chip, a control chip, and a dimming circuit, all electrically connected in sequence. The light intensity detection circuit detects ambient brightness. The analog-to-digital converter chip converts analog signals into digital signals. The control chip outputs a PWM signal based on the digital signal to control the dimming circuit. The data processing control module processes the image signals transmitted by the visual acquisition module and performs pupil localization and fixation point coordinate calculation. The data processing control module also controls the dynamic stimulation module and the biofeedback module. The dynamic stimulation module generates dynamic visual targets using a programmable LED array and presents stimulation signals on a display screen. The biofeedback module guides and prompts the patient to adjust their fixation position.
[0008] Preferably, the light intensity detection circuit includes a resistor R1, a photoresistor Rg, a resistor R2, a capacitor C1, a capacitor C2, a potentiometer RL, an operational amplifier U1, a resistor R3, a resistor R4, and an operational amplifier U2.
[0009] Resistor R1 is connected to power supply VCC at its first end, and to photoresistor Rg at its second end. Photoresistor Rg is grounded at its second end. Operational amplifier U1's inverting input is connected to the second end of resistor R1. Resistor R2's first end is connected to operational amplifier U1's non-inverting input, and its second end is grounded. Capacitor C1's first end is connected to operational amplifier U1's non-inverting input, and its second end is grounded. Potentiometer RL's first end is connected to operational amplifier U1's inverting input, and its movable and second ends are connected to operational amplifier U1's output. Capacitor C2's first end is connected to operational amplifier U1's inverting input, and its second end is connected to operational amplifier U1's output. Resistor R3's first end is connected to operational amplifier U1's output, and its second end is connected to operational amplifier U2's inverting input, and its non-inverting input is grounded. Resistor R4's first end is connected to operational amplifier U2's inverting input, and its second end is connected to operational amplifier U2's output. Operational amplifier U2's output is connected to the input pin of the analog-to-digital converter chip.
[0010] Preferably, the dimming circuit includes capacitor C3, inductor L1, capacitor C4, resistor R5, capacitor C5, driver chip U3, Zener diode D1, and lamp group LEDn, and the driver chip U3 is model SN3350.
[0011] The ADJ pin of the driver chip U3 is connected to the output pin of the control chip. The first terminal of capacitor C3 is connected to the power supply VCC, the second terminal of capacitor C3 is connected to the second terminal of capacitor C5, the first terminal of capacitor C5 is connected to the VIN pin of driver chip U3, the first terminal of inductor L1 is connected to the LX pin of driver chip U3, the GND pin of driver chip U3 is connected to the second terminal of capacitor C3, the VIN pin of driver chip U3 is connected to the power supply VCC, the positive terminal of Zener diode D1 is connected to the ISENSE pin of driver chip U3, the negative terminal of Zener diode D1 is connected to the VIN pin of driver chip U3, the second terminal of resistor R5 is connected to the ISENSE pin of driver chip U3, the first terminal of resistor R5 is connected to the VIN pin of driver chip U3, the first terminal of capacitor C4 is connected to the power supply VCC, the second terminal of capacitor C4 is connected to the second terminal of inductor L1, and the lamp group LEDn includes multiple LEDs connected in series. The starting positive terminal of lamp group LEDn is connected to the power supply VCC, and the ending negative terminal of lamp group LEDn is connected to the second terminal of inductor L1.
[0012] Preferably, the system also includes a data management module, which is signal-connected to the data processing main control module.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] 1. This utility model utilizes a light source control unit comprised of a light intensity detection circuit, an analog-to-digital converter chip, a control chip, and a dimming circuit. This unit can detect ambient brightness in real time and automatically adjust the lighting intensity. In various training environments, whether in dimly lit indoor spaces or in areas with fluctuating lighting, it provides suitable lighting conditions for patients, preventing ambient light issues from affecting training effectiveness. Simultaneously, it reduces the stimulation of the eyes by strong light, improving training comfort and safety.
[0015] 2. This utility model, by setting a data processing main control module with pupil positioning and fixation point coordinate calculation functions, can accurately obtain the patient's fixation position information. Combined with the dynamic stimulation module generating dynamic targets through a programmable LED array and the stimulation signals presented on the display screen, it provides patients with diversified and targeted visual stimulation. The biofeedback module, based on this data, promptly reminds and guides patients to adjust their fixation position, helping them establish correct fixation habits, effectively improving the accuracy of amblyopia training and enhancing the training effect. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of the utility model;
[0017] Figure 2 This is a schematic diagram of the visual acquisition module in the utility model;
[0018] Figure 3 This is a schematic diagram of the structure of the light source control unit in the utility model;
[0019] Figure 4 The circuit diagram is for the light intensity detection circuit in the utility model.
[0020] Figure 5 This is a circuit diagram of the dimming circuit in the utility model.
[0021] In the picture:
[0022] 1. Visual acquisition module; 10. Infrared camera; 11. Light source control unit; 110. Light intensity detection circuit; 111. Analog-to-digital converter chip; 112. Control chip; 113. Dimming circuit; 12. Mechanical adjustment unit;
[0023] 2. Dynamic stimulation module;
[0024] 3. Data processing main control module;
[0025] 4. Biofeedback module;
[0026] 5. Data Management Module. Detailed Implementation
[0027] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0028] Please see Figures 1-5 The present invention provides the following technical solution:
[0029] The device for biofeedback training using an eye tracker includes a visual acquisition module 1, a dynamic stimulation module 2, a data processing and control module 3, and a biofeedback module 4. The visual acquisition module 1 includes an infrared camera 10, a light source control unit 11, and a mechanical adjustment unit 12. The infrared camera 10 illuminates the eye with invisible infrared light to avoid interfering with the patient's vision, while simultaneously capturing eye dynamics. The light source control unit 11 includes a light intensity detection circuit 110, an analog-to-digital converter chip 111, a control chip 112, and a dimming circuit 113, which are connected in sequence. The light intensity detection circuit 110 detects ambient brightness, the analog-to-digital converter chip 111 converts analog signals into digital signals, and the control chip 112 outputs a PWM signal based on the digital signal to control the dimming circuit 113, ensuring constant light intensity and training comfort. The data processing and control module 3 processes the image signals transmitted from the visual acquisition module 1. The data processing and control module 3 is used for... The main control module 3 performs pupil localization and fixation point coordinate calculation. It accurately identifies the geometric center position of the pupil through an algorithm that can use edge detection or deep learning models. The fixation point coordinate calculation converts the pupil position data into the screen coordinates of the patient's actual gaze. The main control module 3 is also used to control the dynamic stimulation module 2 and the biofeedback module 4. The dynamic stimulation module 2 generates dynamic targets through a programmable LED array. It generates targets of different sizes and colors through a precisely arranged LED dot matrix, supports dynamic movement trajectory, and presents stimulation signals on the display screen to generate dynamic visual stimulation that meets the needs of amblyopia rehabilitation, guiding the patient to perform precise fixation training. The biofeedback module 4 is used to remind and guide the patient to adjust the fixation position. When the patient's gaze deviates from the target, the biofeedback module 4 provides immediate feedback such as sound prompts and changes in the color of the target, guiding the patient to actively adjust the fixation position and gradually establish the correct central fixation habit.
[0030] In this embodiment, the light intensity detection circuit 110 includes a resistor R1, a photoresistor Rg, a resistor R2, a capacitor C1, a capacitor C2, a potentiometer RL, an operational amplifier U1, a resistor R3, a resistor R4, and an operational amplifier U2.
[0031] Resistor R1 is connected to power supply VCC at its first terminal. Resistor R1 is connected to the first terminal of photoresistor Rg, and the second terminal of photoresistor Rg is grounded. The inverting input of operational amplifier U1 is connected to the second terminal of resistor R1. Resistor R2 is connected to the non-inverting input of operational amplifier U1, and the second terminal of resistor R2 is grounded. Capacitor C1 is connected to the non-inverting input of operational amplifier U1, and the second terminal of capacitor C1 is grounded. Potentiometer RL is connected to the inverting input of operational amplifier U1 at its first terminal. The movable and second terminals of potentiometer RL are connected to the output of operational amplifier U1. Capacitor C2 is connected to the inverting input of operational amplifier U1, and the capacitor... The second terminal of C2 is connected to the output terminal of operational amplifier U1. The first terminal of resistor R3 is connected to the output terminal of operational amplifier U1. The second terminal of resistor R3 is connected to the inverting input terminal of operational amplifier U2. The non-inverting input terminal of operational amplifier U2 is grounded. The first terminal of resistor R4 is connected to the inverting input terminal of operational amplifier U2. The second terminal of resistor R4 is connected to the output terminal of operational amplifier U2. The output terminal of operational amplifier U2 is connected to the input pin of analog-to-digital converter chip 111. Under different light intensities, the resistance of photoresistor Rg is different, resulting in different voltages at the inverting input terminal of operational amplifier U1. The light intensity data can be obtained by amplifying the signal through operational amplifier U1.
[0032] Specifically, the dimming circuit 113 includes capacitor C3, inductor L1, capacitor C4, resistor R5, capacitor C5, driver chip U3, Zener diode D1 and lamp group LEDn, and the driver chip U3 is model SN3350.
[0033] The ADJ pin of driver chip U3 is connected to the output pin of control chip 112. The first terminal of capacitor C3 is connected to power supply VCC, and the second terminal of capacitor C3 is connected to the second terminal of capacitor C5. The first terminal of capacitor C5 is connected to the VIN pin of driver chip U3. The first terminal of inductor L1 is connected to the LX pin of driver chip U3. The GND pin of driver chip U3 is connected to the second terminal of capacitor C3. The VIN pin of driver chip U3 is connected to power supply VCC. The anode of Zener diode D1 is connected to the ISENSE pin of driver chip U3, and the cathode of Zener diode D1 is connected to the VI pin of driver chip U3. Pin N, the second end of resistor R5 is connected to the ISENSE pin of driver chip U3, the first end of resistor R5 is connected to the VIN pin of driver chip U3, the first end of capacitor C4 is connected to power supply VCC, and the second end of capacitor C4 is connected to the second end of inductor L1. The LED group (LEDn) consists of multiple LEDs connected in series. The positive terminal of LEDn is connected to power supply VCC, and the negative terminal is connected to the second end of inductor L1. Control chip 112 outputs a PWM signal, and driver chip U3 precisely adjusts the current through LEDn through its internal current control circuit. It adjusts the output current based on set parameters or external input signals.
[0034] Furthermore, it also includes a data management module 5, which is connected to the data processing main control module 3. The data management module 5 is used to store patient training data and can also be sent to patients and medical staff via wireless communication.
[0035] In the use of the biofeedback training device using an eye tracker, the photoresistor Rg in the light intensity detection circuit 110 senses changes in ambient light intensity. Under different light intensities, the resistance value of the photoresistor Rg is different, which causes a change in the voltage at the inverting input of the operational amplifier U1. After the operational amplifier U1 amplifies the voltage, it obtains an analog signal representing the ambient light intensity. This signal is transmitted to the control chip 112, which converts the analog signal into a digital signal. After receiving these digital signals, the control chip 112 analyzes and processes them according to a preset program and algorithm, and outputs a corresponding PWM signal. The PWM signal is transmitted to the dimming circuit 113. The driver chip U3 in the dimming circuit 113 adjusts the current through the LED group LEDn precisely according to the PWM signal through its internal current control circuit, thereby realizing automatic adjustment of the lighting intensity and ensuring that the training environment always maintains suitable lighting conditions.
[0036] The mechanical adjustment unit 12 is used to support the patient's head and position the patient's eyes in a suitable position. The infrared camera 10 uses invisible infrared light to illuminate the patient's eyes, which can clearly capture dynamic information of the eyes, such as eye movement and pupil changes, without interfering with the patient's vision. The acquired image signals are transmitted to the data processing main control module 3. The data processing main control module uses a specific algorithm to analyze and process the image signals, accurately identify the geometric center position of the pupil, and realize pupil localization. At the same time, the pupil position data is converted into the screen coordinates of the patient's actual gaze, and the gaze point coordinates are calculated.
[0037] The data processing main control module 3 controls the dynamic stimulation module 2 to work based on the calculated fixation point coordinate information. The dynamic stimulation module 2 generates dynamic targets through a programmable LED array. These targets can present different sizes and colors and have dynamic movement trajectories. The targets, combined with the display screen, present diverse stimulation signals, providing patients with dynamic visual stimulation that meets the needs of amblyopia rehabilitation and guiding patients to conduct precise fixation training. When the patient's fixation position deviates from the target, the biofeedback module 4 will react immediately, reminding and guiding the patient to adjust the fixation position through sound prompts, changes in target color, etc. The patient actively adjusts the eye fixation state based on the feedback information and gradually establishes the correct central fixation habit.
[0038] During training, the data processing main control module 3 transmits the patient's training data, including changes in fixation point coordinates, training time, number of training sessions, and eye movement data, to the data management module 5. The data management module is responsible for storing this data and can also send the data to the patient and medical staff via wireless communication technology. This allows the patient to understand their training progress at any time and also makes it easier for medical staff to track and analyze the patient's training status and adjust the training plan in a timely manner.
[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A device for biofeedback training using an eye tracker, comprising a visual acquisition module (1), a dynamic stimulation module (2), a data processing control module (3), and a biofeedback module (4), characterized in that: The visual acquisition module (1) includes an infrared camera (10), a light source control unit (11), and a mechanical adjustment unit (12). The light source control unit (11) includes a light intensity detection circuit (110), an analog-to-digital converter chip (111), a control chip (112), and a dimming circuit (113) connected in sequence. The light intensity detection circuit (110) is used to detect ambient brightness. The analog-to-digital converter chip (111) is used to convert analog signals into digital signals. The control chip (112) outputs a PWM signal according to the digital signal to control the dimming circuit (113). The data processing main control module (3) processes the image signals transmitted by the visual acquisition module (1). The data processing main control module (3) is used to perform pupil positioning and fixation point coordinate calculation. The data processing main control module (3) is also used to control the dynamic stimulation module (2) and the biofeedback module (4). The dynamic stimulation module (2) generates dynamic visual targets through a programmable LED array and presents stimulation signals in conjunction with the display screen. The biofeedback module (4) is used to remind and guide the patient to adjust the fixation position.
2. The device for biofeedback training using an eye tracker according to claim 1, characterized in that: The light intensity detection circuit (110) includes resistor R1, photoresistor Rg, resistor R2, capacitor C1, capacitor C2, potentiometer RL, operational amplifier U1, resistor R3, resistor R4 and operational amplifier U2; The first end of resistor R1 is connected to the power supply VCC, the second end of resistor R1 is connected to the first end of photoresistor Rg, the second end of photoresistor Rg is grounded, the inverting input of operational amplifier U1 is connected to the second end of resistor R1, the first end of resistor R2 is connected to the non-inverting input of operational amplifier U1, the second end of resistor R2 is grounded, the first end of capacitor C1 is connected to the non-inverting input of operational amplifier U1, the second end of capacitor C1 is grounded, the first end of potentiometer RL is connected to the inverting input of operational amplifier U1, the movable end and the second end of potentiometer RL are connected to the output of operational amplifier U1, the first end of capacitor C2 is connected to the inverting input of operational amplifier U1, the second end of capacitor C2 is connected to the output of operational amplifier U1, the first end of resistor R3 is connected to the output of operational amplifier U1, the second end of resistor R3 is connected to the inverting input of operational amplifier U2, the non-inverting input of operational amplifier U2 is grounded, the first end of resistor R4 is connected to the inverting input of operational amplifier U2, the second end of resistor R4 is connected to the output of operational amplifier U2, and the output of operational amplifier U2 is connected to the input pin of the analog-to-digital converter chip (111).
3. The device for biofeedback training using an eye tracker according to claim 1, characterized in that: The dimming circuit (113) includes capacitor C3, inductor L1, capacitor C4, resistor R5, capacitor C5, driver chip U3, Zener diode D1 and lamp group LEDn. The driver chip U3 is model SN3350. The ADJ pin of the driver chip U3 is connected to the output pin of the control chip (112). The first end of the capacitor C3 is connected to the power supply VCC. The second end of the capacitor C3 is connected to the second end of the capacitor C5. The first end of the capacitor C5 is connected to the VIN pin of the driver chip U3. The first end of the inductor L1 is connected to the LX pin of the driver chip U3. The GND pin of the driver chip U3 is connected to the second end of the capacitor C3. The VIN pin of the driver chip U3 is connected to the power supply VCC. The positive terminal of the Zener diode D1 is connected to the ISENSE pin of the driver chip U3. The negative terminal of the Zener diode D1 is connected to the VIN pin of the driver chip U3. The second end of the resistor R5 is connected to the ISENSE pin of the driver chip U3. The first end of the resistor R5 is connected to the VIN pin of the driver chip U3. The first end of the capacitor C4 is connected to the power supply VCC. The second end of the capacitor C4 is connected to the second end of the inductor L1. The lamp group LEDn includes multiple LEDs connected in series. The starting positive terminal of the lamp group LEDn is connected to the power supply VCC. The ending negative terminal of the lamp group LEDn is connected to the second end of the inductor L1.
4. The device for biofeedback training using an eye tracker according to claim 1, characterized in that: It also includes a data management module (5), which is signal-connected to the data processing main control module (3).