An eye physiotherapy device combining heating and electrical stimulation

Abstract

This invention proposes an eye therapy device combining heating and electrical stimulation, belonging to the technical field of electrical stimulation therapy equipment. It includes a main body and a headband. The two sides of the main body are fixedly connected to the two ends of the headband. The main body surrounds the eye area and has a cavity in front of the eyes. An image acquisition unit is located in the cavity on the side furthest from the user's eyes, used to acquire facial images of the user wearing the therapy device, including the user's interpupillary distance, iris diameter, and facial skin dryness. A main control unit identifies the user based on the interpupillary distance and iris diameter in the facial image. An output unit is located in the cavity between the user's eyes and the image acquisition unit, used to receive the output signal from the main control unit and apply heating and microcurrent stimulation to the user's eyes. A hydration unit hydrates the user's eyes according to their skin dryness. A display unit displays the output. A power supply unit provides rechargeable power.

Description

Technical Field

[0001] This invention relates to the field of physiotherapy equipment technology, and in particular to an eye physiotherapy device that combines heating and electrical stimulation. Background Technology

[0002] Most existing eye therapy devices use heating, vibration, or kneading stimulation to relieve eye fatigue and dryness by stimulating the skin or tissues around the eyes. However, these stimulation methods are limited to the surface of the skin and have very limited effect on improving eye muscle tension or eye nerve fatigue.

[0003] Microcurrent stimulation eye massage devices are now available on the market. These devices use electrodes on the massage head or skin-contact area to deliver microcurrent stimulation. This microcurrent stimulates the nerves and muscles around the eyes, promoting muscle contraction and nerve conduction, thus enhancing eye muscle vitality and potentially improving some eye problems caused by decreased nerve function. However, these eye massage devices are purely manual. Users need to re-set the functions before wearing the device, making it impossible to remember personal preferences and resulting in significant inconvenience when operating the device while wearing it.

[0004] Therefore, it is essential to develop an eye therapy device that combines heating and electrical stimulation. This device can identify, record, and save the wearer's eye characteristics while in use, and replenish moisture according to the dryness of the user's eye skin, thereby providing targeted microcurrent stimulation to the eyes. It eliminates the need for the user to frequently remove the device for adjustment and settings, making it a highly desirable solution. Summary of the Invention

[0005] In view of this, the present invention proposes an eye physiotherapy device that can quickly identify the physiological characteristics of the wearer's eyes, know whether the current user has used physiotherapy equipment and preferences, and adaptively replenish moisture based on the user's physiological characteristics and the current season, thereby improving the stimulation effect on the nerves and muscles around the eyes by combining heating and electrical stimulation.

[0006] The technical solution of this invention is implemented as follows: This invention provides an eye therapy device combining heating and electrical stimulation, comprising a main body and a headband, with both sides of the main body fixedly connected to the two ends of the headband, the main body surrounding the eye area, and the main body having a cavity in front of the eyes; further comprising:

[0007] The image acquisition unit is located on the side of the cavity away from the user's eyes. It is used to acquire facial images of the user after wearing the physiotherapy device, and to acquire the user's interpupillary distance, iris diameter, and the dryness of the facial skin.

[0008] The main control unit, located inside the main body, is connected to the output signal of the image acquisition unit and is used to identify the user's identity based on the user's interpupillary distance and iris diameter in the user's facial image.

[0009] The output unit is located inside the cavity and between the user's eye and the image acquisition unit. It is electrically connected to the main control unit and is used to receive the output signal from the main control unit to provide heating and frequency-modulated microcurrent stimulation to the user's eye.

[0010] The hydration unit is electrically connected to the main control unit to provide hot steam to relieve eye strain and humidify the skin according to the user's skin dryness, thereby enhancing the effect of microcurrent stimulation.

[0011] The display unit is electrically connected to the main control unit and is used for display output;

[0012] The power supply unit is located inside the main body and is electrically connected to the image acquisition unit, main control unit, output unit, water replenishment unit, and display unit.

[0013] Based on the above technical solutions, preferably, the image acquisition unit includes an infrared camera and an image processing module; the infrared camera and the image processing module are communicatively connected; the infrared camera acquires a grayscale image of the user's eyes and sends the infrared image to the image processing module; the image processing module calculates the user's interpupillary distance and iris diameter using a built-in image processing algorithm, and assesses the dryness of the user's facial skin based on a built-in skin resistance correction model.

[0014] Preferably, the image processing algorithm includes the following:

[0015] The grayscale image of the user's eyes is preprocessed, specifically by sampling Gaussian blur for noise reduction and histogram equalization to enhance contrast.

[0016] Edge detection is performed on the preprocessed grayscale image, and the CANNY edge detection algorithm is used to highlight the eyelid contour.

[0017] Set a gradient threshold to extract the eyelid regions of both eyes from the eyelid contours, and delete the images of non-eyelid regions;

[0018] Within the preserved eyelid image range, the iris diameter and interpupillary distance of both eyes are obtained, and the user's identity is identified.

[0019] A further preferred method for obtaining the iris diameter of both eyes within the eyelid region involves separating the sclera, iris, and pupil regions within the eyelid area using grayscale thresholding. A first grayscale threshold [0, 50] is set for the pupil, and a second grayscale threshold (50, 200) is set for the iris. The pupil and iris regions are extracted separately, and circular fitting is used to obtain the circumcircles of the pupil and iris regions. On the circumcircle of the iris, a circular fitting method is used again to fit the center of the iris region.

[0020] A1) On the circumcircle of the iris region, three different boundary points are randomly selected each time as the center of the circle and three sets of fitting circles are drawn according to the radius of the circular boundary of the current iris region. The three sets of fitting circles do not overlap and the spacing is not completely equal.

[0021] A2) Record the closest points of the three sets of fitted circles drawn each time within the iris region and connect them sequentially to form a triangle;

[0022] A3) Repeat drawing three sets of virtual circles, and again form a triangle based on the closest points of the three sets of fitted circles inside the iris region; so that the number of times the three sets of virtual circles are drawn is an odd number of times, not less than 5.

[0023] A4) Perform Boolean operations on the triangles obtained by connecting the closest points of three sets of virtual circles inside the iris region to obtain the overlapping region. Connect any two non-adjacent endpoints within the overlapping region to obtain the first and second intersecting line segments. The length L1 of the first line segment is greater than the length L2 of the second line segment. If the length L1 of the first line segment is less than or equal to 3 times the length L2 of the second line segment, then draw an ellipse inscribed in the overlapping region with the first line segment as its major axis. The center of the ellipse with the smallest area is taken as the corrected center of the iris region, and the diameter from the corrected center of the iris region to the circumcircle of the iris region is taken as the iris diameter. If the length L1 of the first line segment is greater than or equal to 3 times the length L2 of the second line segment, then draw an inscribed circle of the overlapping region with a point on the second line segment as its center. The center of the inscribed circle with the smallest radius is taken as the corrected center of the iris region, and the diameter from the corrected center of the iris region to the circumcircle of the iris region is taken as the pixel diameter of the iris. Convert the pixel diameter of the iris to its actual size in the world coordinate system as the diameter of the iris.

[0024] The interpupillary distance is calculated by approximating the pupil center of each eye after obtaining the circumcircle of the pupil, as follows:

[0025] B1) Select a random point inside the outer circle of the pupil, such that the deviation of the pixel length from the random point to the boundary of the pupil region does not exceed 5%.

[0026] B2) Repeat the process of B1) for each of the two pupil regions at least 5 times to obtain two sets of random points;

[0027] B3) Fit the circumcircle with the smallest diameter to the two sets of random points respectively. Use the centers of the two circumcircles as the centers of the pupils, connect the centers of the two pupils to obtain the pixel distance between the two pupils; convert the pixel distance between the two pupils into the real size in the world coordinate system to obtain the interpupillary distance between the two eyes.

[0028] To identify the user, after receiving the iris diameter and interpupillary distance of both eyes, the main control unit searches for the closest record among the historical users' iris diameter and interpupillary distance data: C1) If the iris diameter and interpupillary distance data of a historical user in the records of the most recent six months are all within 5% of the current user's iris diameter and interpupillary distance data, then the current user is considered to be the same person as the corresponding historical user. The main control unit asks the current user whether to use the historical eye therapy configuration. If the current user does not use the historical eye therapy configuration, then the default configuration or the custom configuration is used.

[0029] C2) If, in the records of the most recent six months, the deviation of either the iris diameter or the interpupillary distance of a historical user from the current user's iris diameter or interpupillary distance is no more than 5%, and the deviation of the other is greater than 5% but no more than 10%, then the main control unit asks whether the current user is a historical user; if so, then refer to C1) use the historical eye therapy configuration or the default configuration; if not, then use the default configuration or the custom configuration.

[0030] C3) If the iris diameter and interpupillary distance data of historical users in the records of the most recent six months deviate by more than 10% from the iris diameter and interpupillary distance data of the current user, then the current user is not considered a historical user. The main control unit records the iris diameter and interpupillary distance of the current user and saves the current user's physiotherapy configuration.

[0031] Preferably, the image processing module assesses the dryness of the user's facial skin based on a built-in skin resistance correction model, specifically: R adj =R base ×(1+ω season ×ΔR season +ΔR weather +ω age ×ΔR age +ω gender ×ΔR gender ), where R adj This is the corrected skin resistance value; R base The baseline skin resistivity is derived from the average skin resistivity measured in a standard environment in a 20-year-old male or female; ΔRseason This represents the change in skin resistivity caused by seasonal factors. Where A is the ratio of the average temperature of the current season to the average temperature of the corresponding season of the previous year, M is the current month, M = 1, 2, ..., 12, and φ is the degree of deviation of the current date from the current season; ΔR weather ΔR represents the change in skin resistivity caused by weather factors. weather = αH + βT + γ, where H is the air humidity on the current date, T is the ambient temperature on the current date, α is the coefficient of influence of humidity on skin resistance, β is the coefficient of influence of temperature on skin resistance, and γ is a constant term; ΔR age ΔR represents the change in skin resistivity caused by age. age =e k(AGE -AGE0) Where k is the age growth coefficient, AGE is the user's current age, and AGE0 is the baseline age for skin aging; ΔR gender The change in skin resistivity due to gender factors; ω season The weight of seasonal factors; ω age The weight of the age factor; ω gender The weights for gender factors are represented; each weight takes a value of [-0.5, +0.5].

[0032] The image processing module estimates the user's corrected skin resistance value based on the skin resistance value correction model. If R adj ≤0.5R base This indicates that the skin is moist; if 0.5R base <R adj ≤1.5R base This indicates that the skin is normal; if R adj >1.5R base This indicates that the skin is dry.

[0033] Further preferred, the change in skin resistance ΔR caused by gender factors gender The value range of ΔR is: when the user's gender is male. gender >1; When the user's gender is female, ΔR gender <1.

[0034] More preferably, the output unit includes a constant current source module, a waveform control module, a relay output module, a frequency modulation module located within the main body, and a conductive silicone goggle located within the cavity;

[0035] The constant current source module includes operational amplifier U3 and transistor Q9. The non-inverting input of operational amplifier U3 is electrically connected to one end of resistor R5 and one end of capacitor C6. The other end of resistor R15 is electrically connected to one end of resistor R14 and one end of capacitor C5. The other end of resistor R14 is electrically connected to the P0.0 port of the main control unit. The inverting input of operational amplifier U3 is electrically connected to one end of resistor R18 and one end of resistor R20. The other end of resistor R20 is electrically connected to the emitter of transistor Q9. The other ends of resistor R18, capacitor C5, and capacitor C6 are all grounded. The output of operational amplifier U3 is electrically connected to the base of transistor Q9. The collector of transistor Q9 is electrically connected to the +20V power supply. The emitter of transistor Q9 serves as the output of the constant current source module.

[0036] The waveform control module includes transistors Q4, Q5, Q6, and Q7. The base of transistor Q6 is electrically connected to one end of resistor R11, and the other end of R11 is electrically connected to port P0.2 of the main control unit. The base of transistor Q7 is electrically connected to one end of resistor R12, and the other end of R12 is electrically connected to port P0.3 of the main control unit. The emitters of both transistors Q6 and Q7 are grounded. The collector of transistor Q6 is electrically connected to the collector of transistor Q4 and one end of resistor R9. The other end is electrically connected to the base of the fifth transistor Q5. The collector of the seventh transistor Q7 is electrically connected to one end of the tenth resistor R10 and the collector of the fifth transistor Q5, respectively. The other end of the tenth resistor R10 is electrically connected to the base of the fourth transistor Q4. The emitters of the fourth transistor Q4 and the fifth transistor Q5 are both electrically connected to the cathodes of the Schottky diode D2. The anode of the Schottky diode D2 is electrically connected to the output terminal of the constant current source module. The P0.2 and P0.3 ports of the main control unit serve as the waveform input terminals of the waveform control module, and the collectors of the sixth transistor Q6 and the seventh transistor Q7 serve as the waveform output terminals of the waveform control module.

[0037] The relay output module includes a second transistor Q2, a first diode D1, and a relay K1. The base of the second transistor Q2 is electrically connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is electrically connected to the output terminal of the frequency modulation module. The emitter of the second transistor Q2 is grounded. The collector of the second transistor Q2 is electrically connected to the anode of the first diode D1 and one end of the coil of the relay K1. The cathode of the first diode D1 and the other end of the coil of the relay K1 are both electrically connected to a +20V power supply. The common contact of the relay K1 is electrically connected to the waveform output terminal of the waveform control module, and the normally open contact of the relay K1 is electrically connected to the conductive silicone goggles.

[0038] In a further preferred embodiment, the hydration unit includes a water storage tank and an electric heater. The water storage tank is detachably installed inside the cavity and is used to store water. An electric heater is installed inside the water storage tank. An electrode is embedded at one end of the water outlet tank near the main body. The electrode is electrically connected to the electric heater. The electrode is also electrically connected to the P4.5 port of the main control unit through an optical coupler. The main control unit enables the electric heater when the user's skin is normal or dry. The electric heater heats the water in the water storage tank, and the water vapor formed by the heating and evaporation humidifies the user's eye area. The electric heater is also configured inside the conductive silicone eye mask for auxiliary heating of the eye area.

[0039] More preferably, the display unit includes an LCD screen and a backlight module, both of which are embedded on the outer surface of the main body. The pins of the LCD screen are electrically connected to a number of input / output ports of the main control unit. The backlight module provides backlight illumination to the LCD screen. The backlight module includes a first transistor Q1 and at least one LED. The base of the first transistor Q1 is electrically connected to one end of a second resistor R2, and the other end of the second resistor R2 is electrically connected to the P1.4 port of the main control unit. The emitter of the first transistor Q1 is grounded, and the collector of the first transistor Q1 is electrically connected to one end of the first resistor R1. The other end of the first resistor R1 is electrically connected to the cathode of at least one LED, and the anode of at least one LED is electrically connected to a +3V power supply.

[0040] In a further preferred embodiment, the power supply unit includes a DC-DC boost module, a charging module, an LDO module, and a power detection module;

[0041] The DC-DC boost module includes a boost chip U4, an eighth transistor Q8, a first MOSFET M1, a second inductor L2, and a third diode D3. Pins 4, 5, and 6 of the boost chip U4 are electrically connected to one end of the second inductor L2 and the drain of the first MOSFET M1. The source of the first MOSFET M1 is electrically connected to a +4.2V power supply and one end of a thirteenth resistor R13. The other end of the thirteenth resistor R13 is electrically connected to the gate of the first MOSFET M1 and the collector of the eighth transistor Q8. The base of the eighth transistor Q8 is electrically connected to one end of a sixteenth resistor R16. The other end of the sixteenth resistor R16 is electrically connected to the P5.5 port of the main control unit. The emitter of the eighth transistor Q8 and the boost chip U4... Pin 2 of the first inductor is grounded; the other end of the second inductor L2 is electrically connected to pin 1 of the boost chip U4 and the anode of the third diode D3. The cathode of the third diode D3 is electrically connected to one end of the nineteenth resistor R19, one end of the seventh capacitor C7, and one end of the eighth capacitor C8. The other end of the nineteenth resistor R19 is electrically connected to one end of the eleventh capacitor C11, pin 3 of the boost chip U4, and one end of the twenty-first resistor R21. The other end of the seventh capacitor C7 is electrically connected to the other end of the eleventh capacitor C11, the other end of the twenty-first resistor R21, and the ground wire. The other end of the eighth capacitor C8 is grounded. The cathode of the third diode D3 serves as the output terminal of the +20V power supply. The +4.2V power supply is the positive output terminal of the battery.

[0042] The charging module includes a charging chip U2 and a Zener diode ED1. The TEMP and GND pins of the charging chip U2 are grounded, and the PROG pin is electrically connected to one end of the seventeenth resistor R17, while the other end of the seventeenth resistor R17 is grounded. The VCC and CE pins of the charging chip U2 are electrically connected to the +5V charging voltage input terminal. The / CHRG pin of the charging chip U2 is electrically connected to the P5.3 port of the main control unit. The / STDBY pin of the charging chip U2 is electrically connected to one end of the tenth capacitor C10, one end of the Zener diode ED1, and the ground wire, respectively. The BAT pin of the charging chip U2 is electrically connected to the other end of the tenth capacitor C10, the other end of the Zener diode ED1, and the positive output terminal of the battery, respectively.

[0043] The input terminal of the LDO module is electrically connected to the positive output terminal of the battery. The output terminal of the LDO module outputs a +3V power supply. The output terminal of the LDO module is also electrically connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded.

[0044] The power detection module includes a third resistor R3 and a fourth resistor R4. One end of the third resistor R3 is electrically connected to the positive output terminal of the battery, and the other end of the third resistor R3 is electrically connected to the P5.0 port of the main control unit and one end of the fourth resistor R4. The other end of the fourth resistor R4 is grounded.

[0045] The present invention provides an eye therapy device that combines heating and electrical stimulation, which has the following advantages compared with the prior art:

[0046] (1) The eye therapy device provided by the present invention, while stimulating the skin around the eyes with microcurrent, takes into account the user's history of use and identifies whether the current user has recently used the therapy device by recognizing the eye image, so as to recommend the user's preferred therapy mode in order to achieve better therapy effect; for the initial theoretical user, the user's identity information will be stored so as to match the next use, thereby reducing the inconvenience of reconfiguration and setting every time the therapy is worn;

[0047] (2) By acquiring eye images through the image acquisition unit, the user's interpupillary distance and iris diameter can be quickly estimated to verify the user's identity. Combined with the built-in skin resistance correction model, the dryness of the user's skin under the current season, gender, age and other conditions can be estimated. In the subsequent physiotherapy process, hot water vapor can be added to relieve eye fatigue and moisturize the skin, reduce skin resistance, and enhance the skin's conductivity to microcurrents, thereby further improving the effect of physiotherapy.

[0048] (3) Constant current output is achieved through constant current source module, waveform control module modulates the signal of input conductive silicone eye mask to constant current output, and output is isolated through relay output module to achieve the stimulation effect of eye nerve and muscle; frequency modulation module can realize frequency modulation of micro current stimulation, which can achieve different stimulation effects and meet personal customization needs. Attached Figure Description

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0050] Figure 1 This is a structural block diagram of an eye therapy device combining heating and electrical stimulation according to the present invention;

[0051] Figure 2 This is a wiring diagram of the constant current source module of an eye therapy device combining heating and electrical stimulation according to the present invention;

[0052] Figure 3 This is a wiring diagram of the waveform control module of an eye therapy device combining heating and electrical stimulation according to the present invention.

[0053] Figure 4 This is a wiring diagram of the relay output module of an eye therapy device combining heating and electrical stimulation according to the present invention;

[0054] Figure 5 This is a wiring diagram of the LCD screen of an eye therapy device combining heating and electrical stimulation according to the present invention.

[0055] Figure 6 This is a wiring diagram of the backlight module of an eye therapy device combining heating and electrical stimulation according to the present invention.

[0056] Figure 7 This is a wiring diagram of the DC-DC boost module of an eye therapy device combining heating and electrical stimulation according to the present invention;

[0057] Figure 8 This is a wiring diagram of the charging module of an eye therapy device combining heating and electrical stimulation according to the present invention.

[0058] Figure 9 This is a wiring diagram of the LDO module of an eye therapy device combining heating and electrical stimulation according to the present invention.

[0059] Figure 10 This is a wiring diagram of the power detection module of an eye therapy device combining heating and electrical stimulation according to the present invention;

[0060] Figure 11 This is a wiring diagram of the main control module of an eye therapy device that combines heating and electrical stimulation according to the present invention.

[0061] Reference numerals in the attached figures: 1. Image acquisition unit; 2. Main control unit; 3. Output unit; 4. Water replenishment unit; 5. Display unit; 6. Power supply unit. Detailed Implementation

[0062] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0063] like Figure 1 As shown, this invention provides an eye therapy device combining heating and electrical stimulation, comprising a main body and a headband. The main body is fixedly connected to both ends of the headband on both sides. The main body is positioned around the area of ​​both eyes, and has a cavity in front of the eyes; the shape of the cavity conforms to the contour of the eyes. It also includes:

[0064] The image acquisition unit 1 is located on the side of the cavity away from the user's eyes, and is used to acquire facial images of the user after wearing the physiotherapy device, and to acquire the user's interpupillary distance, iris diameter and the dryness of the facial skin;

[0065] The main control unit 2 is located inside the main body and is connected to the output signal of the image acquisition unit 1. It is used to identify the user's identity based on the user's interpupillary distance and iris diameter in the user's facial image.

[0066] The output unit 3 is located inside the cavity and between the user's eye and the image acquisition unit 1. It is electrically connected to the main control unit 2 and is used to receive the output signal of the main control unit 2 to perform microcurrent stimulation on the user's eye by heating and frequency modulation. The frequency of the microcurrent stimulation can be adjusted, such as switching between medium frequency and low frequency.

[0067] The hydration unit 4 is electrically connected to the main control unit 2 to provide hot steam to relieve eye fatigue and to humidify the skin according to the user's skin dryness, thereby improving the effect of microcurrent stimulation.

[0068] Display unit 5 is electrically connected to main control unit 2 and is used for display output;

[0069] The power supply unit 6 is located inside the main body and is electrically connected to the image acquisition unit 1, the main control unit 2, the output unit 3, the water replenishment unit 4, and the display unit 5, respectively.

[0070] The headband is designed for wearing the physiotherapy device, while the internal structure of the main body is designed with a hollow and sealed design to facilitate the configuration of core components such as the power supply unit, main control unit, and image acquisition unit 1.

[0071] Image acquisition unit 1 includes an infrared camera and an image processing module. The infrared camera and image processing module are communicatively connected. The infrared camera acquires a grayscale image of the user's eyes and sends the image to the image processing module. The image processing module calculates the user's interpupillary distance and iris diameter using a built-in image processing algorithm. Simultaneously, it assesses the dryness of the user's facial skin based on a built-in skin resistance correction model. Facial skin dryness is typically categorized as moist, normal, and dry. Moist skin has low resistance, which is beneficial for the transmission of microcurrent signals, while normal and dry skin are less conducive to microcurrent signal transmission and may require hydration treatment.

[0072] The image processing algorithms mentioned above include the following:

[0073] S100: Preprocess the acquired grayscale image of the user's eyes, specifically by sampling Gaussian blur for noise reduction and histogram equalization to enhance contrast.

[0074] Gaussian blurring can eliminate noise in an image and reduce false detections during subsequent edge detection. In this embodiment, the size of the Gaussian kernel is (5,5). Histogram equalization can improve image contrast and make details in the image more apparent.

[0075] S200: Perform edge detection on the preprocessed grayscale image and use the CANNY edge detection algorithm to highlight the eyelid contour;

[0076] The gradient magnitude and direction are calculated according to the Sobel operator. It is then determined whether the gradient intensity of each pixel is a local maximum. If so, the pixel is retained; otherwise, it is suppressed.

[0077] S300: Set a gradient threshold to extract the eyelid region of both eyes from the eyelid contour and delete the image of non-eyelid regions;

[0078] A grayscale threshold with a lower bound of 50 and an upper bound of 150 is set. Grayscale values ​​between the lower and upper bounds are considered edges. The contour, i.e., the eyelid region, is extracted from the edge image.

[0079] S400: Obtains the iris diameter and interpupillary distance of both eyes within the preserved eyelid image range, and identifies the user.

[0080] In step S400, the iris diameter of both eyes is obtained within the eyelid region. This is achieved by separating the sclera, iris, and pupil regions within the eyelid region using grayscale thresholding. A first grayscale threshold [0, 50] for the pupil and a second grayscale threshold (50, 200] for the iris are set. The pupil and iris regions are extracted separately, and the circumcircle of the pupil and iris regions is obtained using circular fitting. Furthermore, the center of the iris region is fitted again using circular fitting on the circumcircle of the iris region.

[0081] A1) On the circumcircle of the iris region, three different boundary points are randomly selected each time as the center of the circle and three sets of fitting circles are drawn according to the radius of the circular boundary of the current iris region. The three sets of fitting circles do not overlap and the spacing is not completely equal.

[0082] A2) Record the closest points of the three sets of fitted circles drawn each time within the iris region and connect them sequentially to form a triangle;

[0083] A3) Repeat drawing three sets of virtual circles, and again form a triangle based on the closest points of the three sets of fitted circles inside the iris region; so that the number of times the three sets of virtual circles are drawn is an odd number of times, not less than 5.

[0084] A4) Perform Boolean operations on the triangles obtained by connecting the closest points of three sets of virtual circles inside the iris region to obtain the overlapping region. Connect any two non-adjacent endpoints within the overlapping region to obtain the first and second intersecting line segments. The length L1 of the first line segment is greater than the length L2 of the second line segment. If the length L1 of the first line segment is less than or equal to 3 times the length L2 of the second line segment, then draw an ellipse inscribed in the overlapping region with the first line segment as its major axis. The center of the ellipse with the smallest area is taken as the corrected center of the iris region, and the diameter from the corrected center of the iris region to the circumcircle of the iris region is taken as the iris diameter. If the length L1 of the first line segment is greater than or equal to 3 times the length L2 of the second line segment, then draw an inscribed circle of the overlapping region with a point on the second line segment as its center. The center of the inscribed circle with the smallest radius is taken as the corrected center of the iris region, and the diameter from the corrected center of the iris region to the circumcircle of the iris region is taken as the pixel diameter of the iris. Convert the pixel diameter of the iris to its actual size in the world coordinate system as the diameter of the iris.

[0085] By comparing the lengths of the first and second line segments, if the ratio of the diagonal lengths of the overlapping area is no more than three times, the circumcircle of the first line segment is used to find the iris center. If the ratio of the diagonal lengths of the overlapping area is more than three times, the second line segment is used to find the iris center, thus obtaining the iris diameter. For humans, the iris diameter and interpupillary distance typically remain constant within a certain age range. Therefore, this can be used for rapid identification, reducing the time users spend adjusting eye therapy devices and improving the user experience.

[0086] The center of the pupil usually does not coincide with the center of the iris. Therefore, when calculating the interpupillary distance, it is necessary to first obtain the center position of the pupil. In this embodiment, the interpupillary distance of both eyes is calculated by approximating the pupil center of each eye after obtaining the circumcircle of the pupil, as follows:

[0087] B1) Select a random point inside the outer circle of the pupil, such that the deviation of the pixel length from the random point to the boundary of the pupil region does not exceed 5%.

[0088] B2) Repeat the process of B1) for each of the two pupil regions at least 5 times to obtain two sets of random points;

[0089] B3) Fit the circumcircle with the smallest diameter to the two sets of random points respectively. Use the center of the two circumcircles as the center of the pupil. Connect the centers of the two pupils to obtain the pixel distance between the two pupils. Convert the pixel distance between the two pupils into the real size in the world coordinate system to obtain the interpupillary distance between the two eyes.

[0090] To identify the user's identity, after receiving the iris diameter and interpupillary distance of both eyes, the main control unit 2 searches for the closest record among the historical users' iris diameter and interpupillary distance data: C1) If the iris diameter and interpupillary distance data of a historical user in the records of the most recent six months are all within 5% of the current user's iris diameter and interpupillary distance data, then the current user is considered to be the same person as the corresponding historical user. The main control unit 2 asks the current user whether to use the historical eye therapy configuration. If the current user does not use the historical eye therapy configuration, then the default configuration or the custom configuration is used.

[0091] C2) If, in the records of the most recent six months, the deviation of either the iris diameter or the interpupillary distance of a historical user from the current user's iris diameter or interpupillary distance is no more than 5%, and the deviation of the other is greater than 5% but no more than 10%, then the main control unit 2 asks whether the current user is a historical user; if so, then refer to C1) use the historical eye therapy configuration or the default configuration; if not, then use the default configuration or the custom configuration.

[0092] C3) If the iris diameter and interpupillary distance data of historical users in the records of the most recent six months deviate by more than 10% from the iris diameter and interpupillary distance data of the current user, then the current user is not considered a historical user. The main control unit 2 records the iris diameter and interpupillary distance of the current user and saves the current user's physiotherapy configuration.

[0093] The reason for comparing only historical data from the past six months is that pupillary distance or iris diameter may change with age and disease, making older data less valuable for comparison.

[0094] The default configuration mentioned here refers to stimulation from weak to strong as follows. Depending on the selected duration, two examples are given: 10 minutes and 15 minutes. As shown in the table below, the pulse interval time gradually shortens and the stimulation frequency becomes higher and higher.

[0095] Table 1 Default Configuration 10-Minute Mode

[0096] Pulse period Pulse duty cycle Number of pulses Pulse cycle count Pulse interval time 200μs 100μs 5 487 249.35ms 200μs 100μs 5 690 166.30ms 200μs 100μs 5 900 124.28ms 200μs 100μs 5 1200 99.26ms 200μs 100μs 5 160 66.24ms 200μs 100μs 5 176 49.23ms 200μs 100μs 5 220 33.22ms 200μs 100μs 5 290 24.22ms 200μs 100μs 5 440 16.11ms 200μs 100μs 5 580 12.21ms 200μs 100μs 5 5500 9.21ms 200μs 100μs 5 6000 5.73ms

[0097] Table 2 shows the default configuration for the 15-minute mode.

[0098]

[0099]

[0100] Whether hydration is needed during further stimulation therapy is determined by the image processing module, which uses a built-in skin resistance correction model to assess the dryness of the user's facial skin. Specifically: R adj =R base ×(1+ω season ×ΔR season +ΔR weather +ω age ×ΔR age +ω gender ×ΔR gender ), where R adj This is the corrected skin resistance value; R base The baseline skin resistivity is derived from the average skin resistivity measured in a standard environment in a 20-year-old male or female; ΔR season This represents the change in skin resistivity caused by seasonal factors. Where A is the ratio of the average temperature of the current season to the average temperature of the corresponding season of the previous year, M is the current month, M = 1, 2, ..., 12, and φ is the degree of deviation of the current date from the current season; ΔR weather ΔR represents the change in skin resistivity caused by weather factors. weather = αH + βT + γ, where H is the air humidity on the current date, T is the ambient temperature on the current date, α is the coefficient of influence of humidity on skin resistance, β is the coefficient of influence of temperature on skin resistance, and γ is a constant term; ΔR age ΔR represents the change in skin resistivity caused by age. age =e k(AGE-AGE0) Where k is the age growth coefficient, AGE is the user's current age, and AGE0 is the baseline age for skin aging; ΔR gender The change in skin resistivity due to gender factors; ω season The weight of seasonal factors; ω age The weight of the age factor; ω gender The weights for gender factors are represented; each weight takes a value of [-0.5, +0.5].

[0101] The image processing module estimates the user's corrected skin resistance value based on the skin resistance value correction model. If R adj ≤0.5R base This indicates that the skin is moist; if 0.5R base <R adj ≤1.5R base This indicates that the skin is normal; if R adj >1.5R base This indicates that the skin is dry.

[0102] Changes in skin resistivity ΔR due to gender factors genderThe value range of ΔR is: when the user's gender is male. gender >1; When the user's gender is female, ΔR gender <1.

[0103] The above calculation of skin resistance values ​​is not based on images, but takes into full account the impact of the user's age, gender, current season and weather conditions on human skin, estimates the approximate distribution of the user's skin resistance under the current conditions, and then performs targeted moisturizing operations to improve the unsatisfactory physical therapy effect caused by dry skin and excessively high resistance values.

[0104] like Figure 2 , Figure 3 and Figure 4 As shown, the output unit 3 includes a constant current source module, a waveform control module, a relay output module, a frequency modulation module, and a conductive silicone goggle located inside the body.

[0105] The constant current source module includes operational amplifier U3 and transistor Q9. The non-inverting input of operational amplifier U3 is electrically connected to one end of resistor R5 and one end of capacitor C6. The other end of resistor R5 is electrically connected to one end of resistor R14 and one end of capacitor C5. The other end of resistor R14 is electrically connected to the P0.0 port of main control unit 2. The inverting input of operational amplifier U3 is electrically connected to one end of resistor R18 and one end of resistor R20. The other end of resistor R20 is electrically connected to the emitter of transistor Q9. The other ends of resistor R18, capacitor C5, and capacitor C6 are all grounded. The output of operational amplifier U3 is electrically connected to the base of transistor Q9. The collector of transistor Q9 is electrically connected to a +20V power supply. The emitter of transistor Q9 serves as the output of the constant current source module. Figure 2 As shown, the P0.0 port of the main control unit 2 is the intensity control terminal. The intensity control signal output from this port forms the input voltage through the fourteenth resistor R14. The fifteenth resistor R15 and the fifth capacitor C5 form a low-pass filter to filter out high-frequency noise and stabilize the input signal. The filtered signal is coupled to the non-inverting input terminal of the operational amplifier U3 through the sixth capacitor C6. The operational amplifier U3 adjusts the base current of the ninth transistor Q9. The twentieth resistor R20 and the eighteenth resistor R18 together form a negative feedback circuit to control the gain of the operational amplifier U3. When the ninth transistor Q9 is turned on, the amplified signal is output from the emitter. The output current intensity is determined by the output voltage of the operational amplifier and the characteristics of the transistor. Due to the existence of the negative feedback circuit, the operational amplifier U3 can stably maintain the preset gain multiple, so that the output voltage follows the change of the intensity control signal, thereby ensuring the stable operation of the constant current source.

[0106] The waveform control module includes transistors Q4, Q5, Q6, and Q7. The base of transistor Q6 is electrically connected to one end of resistor R11, and the other end of resistor R11 is electrically connected to port P0.2 of main control unit 2. The base of transistor Q7 is electrically connected to one end of resistor R12, and the other end of resistor R12 is electrically connected to port P0.3 of main control unit 2. The emitters of transistors Q6 and Q7 are both grounded. The collector of transistor Q6 is electrically connected to the collector of transistor Q4 and one end of resistor R9. The other end is electrically connected to the base of the fifth transistor Q5. The collector of the seventh transistor Q7 is electrically connected to one end of the tenth resistor R10 and the collector of the fifth transistor Q5. The other end of the tenth resistor R10 is electrically connected to the base of the fourth transistor Q4. The emitters of the fourth transistor Q4 and the fifth transistor Q5 are both electrically connected to the cathodes of the Schottky diode D2. The anode of the Schottky diode D2 is electrically connected to the output terminal of the constant current source module. The P0.2 and P0.3 ports of the main control unit 2 serve as the waveform input terminals of the waveform control module. The collectors of the sixth transistor Q6 and the seventh transistor Q7 serve as the waveform output terminals of the waveform control module.

[0107] like Figure 3 As shown, waveform A from main control unit 2 drives the sixth transistor Q6, and waveform B drives the seventh transistor Q7. When waveform A is high, the sixth transistor Q6 is turned on, and its collector voltage decreases, thereby reducing the base voltage of the fourth transistor Q4, causing Q4 to turn on. When waveform A is low, the sixth transistor Q6 is turned off, its collector voltage remains unchanged, and the base voltage of the fourth transistor Q4 is relatively high, causing Q4 to turn off. The sixth transistor Q6 and the fourth transistor Q4 operate synchronously.

[0108] When waveform B is high, transistor Q7 is turned on, and its collector voltage decreases, thus reducing the base voltage of transistor Q5, causing Q5 to turn on. When waveform B is low, transistor Q7 is turned off, its collector voltage remains unchanged, and the base voltage of transistor Q5 is relatively high, causing Q5 to turn off. Transistors Q7 and Q5 operate synchronously. Schottky diode D2 provides protection. Resistors R9 and R10 are current-limiting resistors.

[0109] The waveform control module generates specific output signals by logically controlling waveforms A and B. That is, waveforms A and B control the current and voltage of the outputs of A and B respectively, thereby realizing the output control of the load, namely the conductive silicone goggles that provide microcurrent stimulation.

[0110] like Figure 4 As shown, the relay output module includes a second transistor Q2, a first diode D1, and a relay K1. The base of the second transistor Q2 is electrically connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is electrically connected to the output terminal of the frequency modulation module. The emitter of the second transistor Q2 is grounded. The collector of the second transistor Q2 is electrically connected to the anode of the first diode D1 and one end of the coil of the relay K1. The cathode of the first diode D1 and the other end of the coil of the relay K1 are both electrically connected to a +20V power supply. The common contact of the relay K1 is electrically connected to the waveform output terminal of the waveform control module, and the normally open contact of the relay K1 is electrically connected to a conductive silicone goggle.

[0111] The relay output module uses the low-frequency or intermediate-frequency signal output from the frequency modulation module to drive the voltage output of the stronger A and B output signals, achieving isolated drive and frequency regulation. The frequency modulation module typically includes a first frequency signal source, a second frequency signal source, a mixer, a bandpass filter, and an output power amplifier. The outputs of both the first and second frequency signal sources are fed into the mixer. The first frequency signal source is a low-frequency signal, and the second frequency signal source is an unmodulated intermediate-frequency or high-frequency signal. The mixer mixes the input low-frequency signal with the intermediate-frequency or high-frequency signal. The output signal from the mixer is then filtered by the bandpass filter to remove unnecessary low-frequency or high-frequency components, achieving low-frequency modulation of the intermediate frequency. The output is then amplified by the output power amplifier to improve the driving capability of the second transistor Q2, enabling high-frequency or low-frequency switching output of the A / B output signal to meet the user's customized physiotherapy needs. Different bandpass filter frequencies result in different output frequencies. The frequency modulation module uses a conventional structure; this solution does not involve any modifications to the structure of the frequency modulation module.

[0112] The hydration unit 4 includes a water storage tank and an electric heater. The water storage tank is detachably installed inside the cavity and is used to store water. An electric heater is installed inside the water storage tank. An electrode is embedded at the end of the water outlet near the main body, and the electrode is electrically connected to the electric heater. The electrode is also electrically connected to the P4.5 port of the main control unit 2 via an optocoupler. The main control unit 2 enables the electric heater when the user's skin is normal or dry. The electric heater heats the water in the storage tank, and the water vapor formed by the evaporation moisturizes the user's eye area. The user's skin condition is determined by estimation based on the built-in skin resistance correction model of the previous image processing module. If the skin is normal, the electric heater can be turned on intermittently; if the skin is dry, the electric heater will work continuously or intermittently, providing water vapor to moisturize the skin while avoiding excessive water vapor temperature. The electric heater is also installed inside the conductive silicone eye mask for auxiliary heating of the eye area.

[0113] like Figure 5 and Figure 6 As shown, the display unit 5 includes an LCD screen and a backlight module. Both the LCD screen and the backlight module are embedded on the outer surface of the main body. The pins of the LCD screen are electrically connected to several input / output ports of the main control unit 2 in a one-to-one correspondence. The backlight module provides backlight illumination to the LCD screen. The backlight module includes a first transistor Q1 and at least one LED. The base of the first transistor Q1 is electrically connected to one end of a second resistor R2, and the other end of the second resistor R2 is electrically connected to port P1.4 of the main control unit 2. The emitter of the first transistor Q1 is grounded, and the collector of the first transistor Q1 is electrically connected to one end of the first resistor R1. The other end of the first resistor R1 is electrically connected to the cathode of at least one LED, and the anode of at least one LED is electrically connected to a +3V power supply. The LCD screen can display the start time, remaining time, user identity, and other information of the current eye therapy at the output terminal. The backlight module is used to provide backlight illumination for the LCD screen when the environment is relatively dark.

[0114] like Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, power supply unit 6 includes a DC-DC boost module, a charging module, an LDO module, and a power detection module.

[0115] The DC-DC boost module includes a boost chip U4, an eighth transistor Q8, a first MOSFET M1, a second inductor L2, and a third diode D3. Pins 4, 5, and 6 of the boost chip U4 are electrically connected to one end of the second inductor L2 and the drain of the first MOSFET M1. The source of the first MOSFET M1 is electrically connected to a +4.2V power supply and one end of the thirteenth resistor R13. The other end of the thirteenth resistor R13 is electrically connected to the gate of the first MOSFET M1 and the collector of the eighth transistor Q8. The base of the eighth transistor Q8 is electrically connected to one end of the sixteenth resistor R16. The other end of the sixteenth resistor R16 is electrically connected to the P5.5 port of the main control unit 2. The emitter of the eighth transistor Q8 and the boost chip U4 are connected to the drain of the first MOSFET M1. Pin 2 of capacitor 4 is grounded; the other end of the second inductor L2 is electrically connected to pin 1 of the boost chip U4 and the anode of the third diode D3, respectively. The cathode of the third diode D3 is electrically connected to one end of the nineteenth resistor R19, one end of the seventh capacitor C7, and one end of the eighth capacitor C8, respectively. The other end of the nineteenth resistor R19 is electrically connected to one end of the eleventh capacitor C11, pin 3 of the boost chip U4, and one end of the twenty-first resistor R21, respectively. The other end of the seventh capacitor C7 is electrically connected to the other end of the eleventh capacitor C11, the other end of the twenty-first resistor R21, and the ground wire, respectively. The other end of the eighth capacitor C8 is grounded; the cathode of the third diode D3 serves as the output terminal of the +20V power supply; the +4.2V power supply is the positive output terminal of the battery.

[0116] The boost converter U4 uses a B628_SX108 to boost the input voltage from -0.3V to 26V to a range of -0.3V to 30V. The output voltage of the boost converter U4 is calculated using the formula VOUT = VREF × (1 + R19 / R21). The reference voltage VREF is typically 0.6V, so VOUT = 33 × 0.6 = 19.8V, approximately 20V. The boost enable signal drives the first MOSFET M1 to conduct and provides the operating enable signal for the boost converter U4.

[0117] The charging module includes a charging chip U2 and a Zener diode ED1. The TEMP and GND pins of the charging chip U2 are grounded. The PROG pin is electrically connected to one end of the seventeenth resistor R17, and the other end of R17 is grounded. The VCC and CE pins of the charging chip U2 are electrically connected to the +5V charging voltage input terminal. The / CHRG pin of the charging chip U2 is electrically connected to the P5.3 port of the main control unit 2. The / STDBY pin of the charging chip U2 is electrically connected to one end of the tenth capacitor C10, one end of the Zener diode ED1, and ground. The BAT pin of the charging chip U2 is electrically connected to the other end of the tenth capacitor C10, the other end of the Zener diode ED1, and the positive output terminal of the battery. The PROG pin is the constant current charging setting terminal, and the charging current is determined by the external seventeenth resistor R17.

[0118] The input terminal of the LDO module is electrically connected to the positive output terminal of the battery. The output terminal of the LDO module outputs a +3V power supply. The output terminal of the LDO module is also electrically connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded. The LDO module is used to output a +3V power supply for the backlight module and the main control unit 2.

[0119] The power detection module includes a third resistor R3 and a fourth resistor R4. One end of the third resistor R3 is electrically connected to the positive output terminal of the battery, and the other end of the third resistor R3 is electrically connected to both the P5.0 port of the main control unit 2 and one end of the fourth resistor R4. The other end of the fourth resistor R4 is grounded. The power detection module determines the remaining capacity by acquiring the output voltage of the battery's positive terminal to see if it meets the power consumption requirements of the physiotherapy. If it does, no alarm signal is issued; otherwise, a buzzer is activated to prompt the user to charge the battery promptly. The charging module uses a +5V charging voltage. Figure 8 The USB 5V signal can come from a common TYPE-C charging interface or a MicroUSB interface, which will not be elaborated here.

[0120] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An eye therapy device combining heating and electrical stimulation, comprising a body and a headband, wherein the two sides of the body are respectively fixedly connected to the two ends of the headband, the body is disposed around the area of ​​both eyes, and the body has a cavity in front of the eyes; characterized in that, Also includes: The image acquisition unit (1) is located on the side of the cavity away from the user's eyes. It is used to acquire facial images of the user after wearing the physiotherapy device, and to acquire the user's interpupillary distance, iris diameter and the dryness of the facial skin. The image acquisition unit (1) includes an infrared camera and an image processing module; the infrared camera is communicatively connected to the image processing module; the infrared camera acquires a grayscale image of the user's eye and sends the infrared image to the image processing module; The image processing module calculates the user's interpupillary distance and iris diameter using built-in image processing algorithms. On the other hand, it assesses the dryness of the user's facial skin based on a built-in skin resistance correction model. The image processing module assesses the dryness of the user's facial skin based on a built-in skin resistance correction model. Specifically, R... adj =R base ×(1+ω season ×ΔR season +ΔR weather +ω age ×ΔR age +ω gender ×ΔR gender ), where R adj This is the corrected skin resistance value; R base The baseline skin resistivity is derived from the average skin resistivity measured in a standard environment in a 20-year-old male or female; ΔR season This represents the change in skin resistivity caused by seasonal factors. Where A is the ratio of the average temperature of the current season to the average temperature of the corresponding season of the previous year, M is the current month, M = 1, 2, ..., 12, and φ is the degree of deviation of the current date from the current season; ΔR weather ΔR represents the change in skin resistivity caused by weather factors. weather = αH + βT + γ, where H is the air humidity on the current date, T is the ambient temperature on the current date, α is the coefficient of influence of humidity on skin resistance, β is the coefficient of influence of temperature on skin resistance, and γ is a constant term; ΔR age ΔR represents the change in skin resistivity caused by age. age =e k(AGE-AGE0) Where k is the age growth coefficient, AGE is the user's current age, and AGE0 is the baseline age for skin aging; ΔR gender The change in skin resistivity due to gender factors; ω season The weight of seasonal factors; ω age The weight of the age factor; ω gender The weights for gender factors are represented; each weight takes a value of [-0.5, +0.5]. The image processing module estimates the user's corrected skin resistance value based on the skin resistance value correction model. If R adj ≤0.5R base This indicates that the skin is moist; if 0.5R base <R adj ≤1.5R base This indicates that the skin is normal; if R adj >1.5R base This indicates dry skin; the change in skin resistance ΔR caused by gender factors gender The value range of ΔR is: when the user's gender is male. gender >1; When the user's gender is female, ΔR gender <1; The main control unit (2) is located inside the main body and is connected to the output signal of the image acquisition unit (1). It is used to identify the user's identity based on the user's interpupillary distance and iris diameter in the user's facial image. The output unit (3) is located inside the cavity and between the user's eye and the image acquisition unit (1). It is electrically connected to the main control unit (2) and is used to receive the output signal of the main control unit (2) to provide microcurrent stimulation to the user's eye by heating and frequency modulation. The hydration unit (4) is electrically connected to the main control unit (2) to provide hot steam to relieve eye fatigue and to humidify the skin according to the dryness of the user's skin, thereby improving the effect of microcurrent stimulation. The display unit (5) is electrically connected to the main control unit (2) and is used for display output; The power supply unit (6) is located inside the main body and is electrically connected to the image acquisition unit (1), the main control unit (2), the output unit (3), the water replenishment unit (4), and the display unit (5).

2. The eye therapy device combining heating and electrical stimulation according to claim 1, characterized in that, Image processing algorithms include the following: The grayscale image of the user's eyes is preprocessed, specifically by sampling Gaussian blur for noise reduction and histogram equalization to enhance contrast. Edge detection is performed on the preprocessed grayscale image, and the CANNY edge detection algorithm is used to highlight the eyelid contour. Set a gradient threshold to extract the eyelid regions of both eyes from the eyelid contours, and delete the images of non-eyelid regions; Within the preserved eyelid image range, the iris diameter and interpupillary distance of both eyes are obtained, and the user's identity is identified.

3. The eye therapy device combining heating and electrical stimulation according to claim 2, characterized in that, To obtain the iris diameter of both eyes within the eyelid region, the sclera, iris, and pupil regions are separated using grayscale thresholding. A first grayscale threshold of [0, 50] is set for the pupil, and a second grayscale threshold of (50, 200) is set for the iris. The pupil and iris regions are extracted separately, and circular fitting is used to obtain the circumcircles of the pupil and iris regions. Finally, a circle fitting method is used again on the circumcircle of the iris to fit the center of the iris region. A1) On the circumcircle of the iris region, three different boundary points are randomly selected each time as the center of the circle and three sets of fitting circles are drawn according to the radius of the circular boundary of the current iris region. The three sets of fitting circles do not overlap and the spacing is not completely equal. A2) Record the closest points of the three sets of fitted circles drawn each time within the iris region and connect them sequentially to form a triangle; A3) Repeat drawing three sets of virtual circles, and again form a triangle based on the closest points of the three sets of fitted circles inside the iris region; so that the number of times the three sets of virtual circles are drawn is an odd number of times, not less than 5. A4) Perform Boolean operations on the triangles obtained by connecting the closest points of three sets of virtual circles inside the iris region to obtain the overlapping region. Connect any two non-adjacent endpoints within the overlapping region to obtain the first and second intersecting line segments. The length L1 of the first line segment is greater than the length L2 of the second line segment. If the length L1 of the first line segment is less than or equal to 3 times the length L2 of the second line segment, then draw an ellipse inscribed in the overlapping region with the first line segment as the major axis. The center of the ellipse with the smallest area is taken as the corrected center of the iris region, and the diameter from the corrected center of the iris region to the circumcircle of the iris region is taken as the iris diameter. If the length L1 of the first line segment is greater than or equal to 3 times the length L2 of the second line segment, then draw an inscribed circle of the overlapping region with a point on the second line segment as the center. The center of the inscribed circle with the smallest radius is taken as the corrected center of the iris region, and the diameter from the corrected center of the iris region to the circumcircle of the iris region is taken as the pixel diameter of the iris. Convert the pixel diameter of the iris to its actual size in the world coordinate system as the diameter of the iris; The interpupillary distance is calculated by approximating the pupil center of each eye after obtaining the circumcircle of the pupil, as follows: B1) Select a random point inside the outer circle of the pupil, such that the deviation of the pixel length from the random point to the boundary of the pupil region does not exceed 5%. B2) Repeat the process of B1) for each of the two pupil regions at least 5 times to obtain two sets of random points; B3) Fit the circumcircle with the smallest diameter to the two sets of random points respectively. Use the centers of the two circumcircles as the centers of the pupils, connect the centers of the two pupils to obtain the pixel distance between the two pupils; convert the pixel distance between the two pupils into the real size in the world coordinate system to obtain the interpupillary distance between the two eyes. To identify the user's identity, after receiving the iris diameter and interpupillary distance of both eyes, the main control unit (2) searches for the closest record in the data of the iris diameter and interpupillary distance of the historical users: C1) If the data of the iris diameter and interpupillary distance of the historical users in the records of the most recent six months are all within 5% of the deviation of the iris diameter and interpupillary distance of the current user, then it is considered that the current user and the corresponding historical user are the same person. The main control unit (2) asks the current user whether to use the historical eye therapy configuration. If the current user does not use the historical eye therapy configuration, then the default configuration or the custom configuration is used. C2) If, in the records of the most recent six months, the deviation of either the iris diameter or the interpupillary distance of a historical user from the iris diameter or the interpupillary distance of the current user is no more than 5%, and the deviation of the other is greater than 5% but no more than 10%, then the main control unit (2) asks whether the current user is a historical user; if so, then refer to C1) use the historical eye therapy configuration or the default configuration; if not, then use the default configuration or the custom configuration. C3) If the data of iris diameter and interpupillary distance of the historical user in the records of the most recent six months are more than 10% different from the data of iris diameter and interpupillary distance of the current user, then the current user is not considered to be a historical user. The main control unit (2) records the iris diameter and interpupillary distance of the current user and saves the physiotherapy configuration of the current user.

4. The eye therapy device combining heating and electrical stimulation according to claim 1, characterized in that, The output unit (3) includes a constant current source module, a waveform control module, a relay output module, a frequency modulation module, and a conductive silicone goggle located inside the body. The constant current source module includes operational amplifier U3 and transistor Q9. The non-inverting input of operational amplifier U3 is electrically connected to one end of the fifteenth resistor R5 and one end of the sixth capacitor C6. The other end of the fifteenth resistor R15 is electrically connected to one end of the fourteenth resistor R14 and one end of the fifth capacitor C5. The other end of the fourteenth resistor R14 is electrically connected to the P0.0 port of the main control unit (2). The inverting input of operational amplifier U3 is electrically connected to one end of the eighteenth resistor R18 and one end of the twentieth resistor R20. The other end of the twentieth resistor R20 is electrically connected to the emitter of transistor Q9. The other ends of the eighteenth resistor R18, the fifth capacitor C5, and the sixth capacitor C6 are all grounded. The output of operational amplifier U3 is electrically connected to the base of transistor Q9. The collector of transistor Q9 is electrically connected to the +20V power supply. The emitter of transistor Q9 serves as the output of the constant current source module. The waveform control module includes a fourth transistor Q4, a fifth transistor Q5, a sixth transistor Q6, and a seventh transistor Q7. The base of the sixth transistor Q6 is electrically connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is electrically connected to the P0.2 port of the main control unit (2). The base of the seventh transistor Q7 is electrically connected to one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is electrically connected to the P0.3 port of the main control unit (2). The emitters of the sixth transistor Q6 and the seventh transistor Q7 are both grounded. The collector of the sixth transistor Q6 is electrically connected to the collector of the fourth transistor Q4 and one end of the ninth resistor R9. The other end of 9 is electrically connected to the base of the fifth transistor Q5. The collector of the seventh transistor Q7 is electrically connected to one end of the tenth resistor R10 and the collector of the fifth transistor Q5. The other end of the tenth resistor R10 is electrically connected to the base of the fourth transistor Q4. The emitters of the fourth transistor Q4 and the fifth transistor Q5 are both electrically connected to the cathodes of the Schottky diode D2. The anode of the Schottky diode D2 is electrically connected to the output terminal of the constant current source module. The P0.2 and P0.3 ports of the main control unit (2) serve as the waveform input terminals of the waveform control module. The collectors of the sixth transistor Q6 and the seventh transistor Q7 serve as the waveform output terminals of the waveform control module. The relay output module includes a second transistor Q2, a first diode D1, and a relay K1. The base of the second transistor Q2 is electrically connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is electrically connected to the output terminal of the frequency modulation module. The emitter of the second transistor Q2 is grounded. The collector of the second transistor Q2 is electrically connected to the anode of the first diode D1 and one end of the coil of the relay K1. The cathode of the first diode D1 and the other end of the coil of the relay K1 are both electrically connected to a +20V power supply. The common contact of the relay K1 is electrically connected to the waveform output terminal of the waveform control module, and the normally open contact of the relay K1 is electrically connected to the conductive silicone goggles.

5. The eye therapy device combining heating and electrical stimulation according to claim 4, characterized in that, The water replenishment unit (4) includes a water storage tank and an electric heater. The water storage tank is detachably installed in the cavity and is used to store water. An electric heater is installed in the water storage tank. An electrode is embedded at one end of the water outlet tank near the main body. The electrode is electrically connected to the electric heater. The electrode is also electrically connected to the P4.5 port of the main control unit (2) through an optical coupler. The main control unit (2) enables the electric heater when the user's skin is normal or dry. The electric heater heats the water in the water storage tank. The water vapor formed by the heating and evaporation moisturizes the user's eye area. The electric heater is also installed in the conductive silicone eye mask for auxiliary heating of the eye area.

6. The eye therapy device combining heating and electrical stimulation according to claim 5, characterized in that, The display unit (5) includes an LCD screen and a backlight module. Both the LCD screen and the backlight module are embedded on the outer surface of the main body. The pins of the LCD screen are electrically connected to several input and output ports of the main control unit (2) in a one-to-one correspondence. The backlight module provides backlight illumination to the LCD screen. The backlight module includes a first transistor Q1 and at least one LED. The base of the first transistor Q1 is electrically connected to one end of the second resistor R2. The other end of the second resistor R2 is electrically connected to the P1.4 port of the main control unit (2). The emitter of the first transistor Q1 is grounded. The collector of the first transistor Q1 is electrically connected to one end of the first resistor R1. The other end of the first resistor R1 is electrically connected to the cathode of at least one LED. The anode of at least one LED is electrically connected to a +3V power supply.

7. The eye therapy device combining heating and electrical stimulation according to claim 6, characterized in that, The power supply unit (6) includes a DC-DC boost module, a charging module, an LDO module, and a power detection module; The DC-DC boost module includes a boost chip U4, an eighth transistor Q8, a first MOSFET M1, a second inductor L2, and a third diode D3. Pins 4, 5, and 6 of the boost chip U4 are electrically connected to one end of the second inductor L2 and the drain of the first MOSFET M1. The source of the first MOSFET M1 is electrically connected to a +4.2V power supply and one end of the thirteenth resistor R13. The other end of the thirteenth resistor R13 is electrically connected to the gate of the first MOSFET M1 and the collector of the eighth transistor Q8. The base of the eighth transistor Q8 is electrically connected to one end of the sixteenth resistor R16. The other end of the sixteenth resistor R16 is electrically connected to the P5.5 port of the main control unit (2). The emitter of the eighth transistor Q8 and the boost chip... Pin 2 of U4 is grounded; the other end of the second inductor L2 is electrically connected to pin 1 of the boost chip U4 and the anode of the third diode D3. The cathode of the third diode D3 is electrically connected to one end of the nineteenth resistor R19, one end of the seventh capacitor C7, and one end of the eighth capacitor C8. The other end of the nineteenth resistor R19 is electrically connected to one end of the eleventh capacitor C11, pin 3 of the boost chip U4, and one end of the twenty-first resistor R21. The other end of the seventh capacitor C7 is electrically connected to the other end of the eleventh capacitor C11, the other end of the twenty-first resistor R21, and the ground wire. The other end of the eighth capacitor C8 is grounded. The cathode of the third diode D3 serves as the output terminal of the +20V power supply. The +4.2V power supply is the positive output terminal of the battery. The charging module includes a charging chip U2 and a Zener diode ED1. The TEMP and GND pins of the charging chip U2 are grounded, the PROG pin is electrically connected to one end of the seventeenth resistor R17, and the other end of the seventeenth resistor R17 is grounded. The VCC and CE pins of the charging chip U2 are electrically connected to the +5V charging voltage input terminal. The / CHRG pin of the charging chip U2 is electrically connected to the P5.3 port of the main control unit (2). The / STDBY pin of the charging chip U2 is electrically connected to one end of the tenth capacitor C10, one end of the Zener diode ED1, and the ground wire, respectively. The BAT pin of the charging chip U2 is electrically connected to the other end of the tenth capacitor C10, the other end of the Zener diode ED1, and the positive output terminal of the battery, respectively. The input terminal of the LDO module is electrically connected to the positive output terminal of the battery. The output terminal of the LDO module outputs a +3V power supply. The output terminal of the LDO module is also electrically connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded. The power detection module includes a third resistor R3 and a fourth resistor R4. One end of the third resistor R3 is electrically connected to the positive output terminal of the battery. The other end of the third resistor R3 is electrically connected to the P5.0 port of the main control unit (2) and one end of the fourth resistor R4, respectively. The other end of the fourth resistor R4 is grounded.

Images