A non-contact intraocular pressure measuring instrument and measuring method

Abstract

The present invention relates to the technical field of ophthalmic detection equipment, and discloses a non-contact intraocular pressure measuring meter and a measuring method, comprising a frame assembly, an eye tracking mechanism and an air supply pressure mechanism, wherein the frame assembly comprises a lens frame and a shell, the shell has a receiving cavity, an opening connected to the receiving cavity is provided on the shell, the side of the lens frame away from the patient's face is connected to the plane where the opening is located, the eye tracking mechanism comprises an LED screen and an image acquisition component, the image acquisition components are all arranged on the lens frame, the LED screen is installed on the cavity wall of the receiving cavity away from the opening, the air supply pressure mechanism is located in the receiving cavity, the air supply pressure mechanism comprises an air pressure piece and an adjustment component, one end of the position adjustment piece is connected to the cavity wall of the receiving cavity, the other end of the adjustment component is provided with an air pressure piece, the air pressure piece is used to emit a pulsed airflow to a preset position on the patient's eyeball, and the adjustment component is arranged to be able to adjust the position of the air pressure piece in the horizontal direction and the vertical direction. In this way, accurate measurement of intraocular pressure can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ophthalmic testing equipment, in particular to a non-contact intraocular pressure measuring instrument and a measuring method. Background Art

[0002] Intraocular pressure (IOP) is an important physiological parameter in ophthalmological diagnosis, and its abnormal increase is one of the important factors leading to eye diseases such as glaucoma. Although traditional contact intraocular pressure measurement methods, such as Goldmann applanation tonometer, are considered the gold standard, they have problems such as complex operation, patient discomfort, invasiveness, and potential infection risks. With the development of science and technology, non-contact intraocular pressure measurement technology has gradually become an important research direction in the field of ophthalmology. Non-contact intraocular pressure measurement technology can not only avoid the shortcomings of traditional methods, but also improve the accuracy of measurement and patient comfort.

[0003] However, during the measurement process, the patient's eyes are easily affected by the environment (such as light interference or airflow interference) and their own physiological influences (involuntary frequent blinking), which may cause the pulsed airflow ejected by the pneumatic component to fail to accurately hit the preset position on the patient's eyeball, resulting in errors in the measurement data. Summary of the invention

[0004] The object of the present invention is to provide a non-contact intraocular pressure measuring instrument and a measuring method to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned object, the present disclosure provides a non-contact tonometer, including a frame assembly, an eye tracking mechanism, and an air supply pressure mechanism;

[0006] The frame assembly comprises a mirror frame and a shell, wherein the shell has a receiving cavity, an opening communicating with the receiving cavity is formed on the shell, and a side of the mirror frame facing away from the patient's face is connected to a plane where the opening is located;

[0007] The eye tracking mechanism comprises an LED screen and an image acquisition component, wherein the image acquisition components are arranged on the mirror frame, and the LED screen is installed on the cavity wall of the accommodating cavity away from the opening;

[0008] The air supply pressure mechanism is located in the accommodating cavity, and includes a pneumatic component and an adjustment component. One end of the position adjustment component is connected to the cavity wall of the accommodating cavity, and the other end of the adjustment component is provided with the pneumatic component. The pneumatic component is used to emit pulsed airflow to a preset position on the patient's eyeball, and the adjustment component is configured to be able to adjust the position of the pneumatic component in the horizontal and vertical directions.

[0009] Optionally, the adjustment assembly includes a first joint, a first rotating arm, a second joint and a second rotating arm;

[0010] The first joint is connected to the top of the cavity wall of the accommodating cavity, the first end of the first rotating arm is hinged to the first joint, the second joint is axially rotatably connected to the second end of the first rotating arm, the first end of the second rotating arm is hinged to the second joint, and the pneumatic part is connected to the second end of the second rotating arm.

[0011] Optionally, the adjustment assembly includes a first driving component, a second driving component and a third driving component;

[0012] The first driving component is in transmission connection with the first rotating arm to drive the first rotating arm to rotate relative to the housing and change the angle between the first rotating arm and the top of the cavity wall of the accommodating cavity;

[0013] The second driving component is in transmission connection with the second rotating arm to drive the second rotating arm to rotate relative to the first rotating arm and change the included angle between the second rotating arm and the first rotating arm;

[0014] The third driving component is transmission-connected to the second joint to drive the second joint to rotate around its axial direction.

[0015] Optionally, the tonometer further comprises a position sensor and an angle sensor;

[0016] The position sensor is mounted on the pneumatic component to detect the relative position of the pneumatic component with respect to the preset position;

[0017] The angle sensors are installed on both the first joint and the second joint to detect the rotation angle of the first joint and the rotation angle of the second joint respectively.

[0018] Optionally, the image acquisition component includes a camera and a shooting camera;

[0019] The camera is arranged on a side of the frame facing the patient's face, and is used to collect images on the spherical surface of the eyeball and to capture image changes of the cornea of ​​the eyeball under the action of the pulsed airflow;

[0020] The shooting camera is arranged on a side of the frame facing the accommodating cavity, and is used to capture images of the surrounding environment and cooperate with the camera to determine the gaze position of the patient's eyes.

[0021] Optionally, the shell is formed as a hollow frustum structure, and in a first direction, the cross-sectional area of ​​the shell gradually increases in a direction away from the lens frame;

[0022] The shell includes a bottom plate and a plurality of side plates surrounding the bottom plate, the bottom plate and the plurality of side plates together define the accommodating cavity, and the LED screen is installed on a side of the bottom plate close to the accommodating cavity.

[0023] Optionally, the non-contact tonometer further comprises a wearing assembly, and the frame comprises a first frame body, a connecting portion and a second frame body;

[0024] The first frame, the connecting portion and the second frame are sequentially connected in a horizontal direction, and the first frame and the second frame are respectively opposite to one eye of the patient;

[0025] The wearing component includes two elastic bands, hard-hair Velcro and soft-hair Velcro, the two elastic bands are respectively connected to the first frame and the second frame, the hard-hair Velcro is provided at one end of one of the two elastic bands away from the frame, and the soft-hair Velcro is provided at one end of the other of the two elastic bands away from the frame.

[0026] Optionally, the non-contact tonometer further comprises two shielding covers;

[0027] One of the two shielding covers is disposed on a side of the first frame body facing the patient's face, and is used to enclose between the first frame body and the patient's face;

[0028] The other of the two shielding covers is arranged on a side of the second frame body facing the patient's face, and is used to enclose between the second frame body and the patient's face.

[0029] Optionally, the non-contact tonometer further comprises a control system;

[0030] The control system is electrically connected to both the eye tracking mechanism and the air supply pressure mechanism.

[0031] The present disclosure also provides a non-contact intraocular pressure measurement method, based on the above-mentioned non-contact intraocular pressure measurement meter, comprising the following steps:

[0032] Step 1: Activate the eye tracking mechanism and guide the patient to look at a fixed point or move his / her sight along the instructions on the screen through the LED screen;

[0033] Step 2: using the image acquisition component to capture the image on the eyeball surface and the image on the LED screen in real time, and calculating the gaze direction and gaze point of the eyeball through the image processing algorithm in the control system;

[0034] Step 3: According to the position information provided by the eye tracking mechanism, the control system adjusts the position of the pneumatic component through the adjustment component to ensure that the pneumatic component can accurately align with the preset position of the eyeball;

[0035] Step 4: Detecting the relative position and angle of the pneumatic component with respect to the preset position by means of the position sensor and the angle sensor to ensure that the pneumatic component can be in the optimal launching position;

[0036] Step 5: When the position and angle of the air pressure piece are adjusted to the desired position, the control system starts the air supply pressure mechanism to emit pulsed airflow to the preset position through the air pressure piece;

[0037] Step 6: The image acquisition component continues to capture the image changes of the eyeball under the action of the pulsed airflow, and records the degree of corneal concavity and rebound speed;

[0038] Step 7: The control system analyzes the image data through a built-in algorithm, and calculates the value of the intraocular pressure by combining the intensity of the pulsed airflow and the reaction of the eyeball;

[0039] Step 8: Repeat steps 3 to 7 to get the average value.

[0040] Through the above technical solution, the entire device can be stably worn on the patient's head and aligned with the patient's eyes through the set frame. Through the set LED screen, on the one hand, it can be used to display different marked images or videos, which can be used as a reference to compare and analyze with the image of the patient's eyeball spherical surface to help determine the current position and movement trajectory of the eyeball. On the other hand, it can help the patient maintain a fixed eye direction. Through the set image acquisition component, the position change of the corneal vertex can be accurately captured. Based on the position information of the corneal vertex, the following control system can adjust the position of the pneumatic part through the adjustment component to ensure that the pulsed airflow ejected by the pneumatic part can always accurately hit the corneal vertex. In this way, the eyeball movement can be tracked in real time through the eyeball tracking mechanism, and the position of the pneumatic part can be dynamically adjusted through the adjustment component according to the eyeball movement, which can ensure that each measurement can accurately hit the corneal vertex, which is conducive to improving the accuracy of the measurement. The patient can be guided to maintain a fixed eye direction through the LED screen, which can simplify the measurement process and improve the patient's comfort and cooperation. That is to say, the non-contact tonometer provided by the present invention can achieve accurate and reliable measurement of intraocular pressure through the coordinated work of the frame, LED screen, image acquisition component, air supply pressure mechanism and the control system described below. In addition, the device does not require direct contact with the patient's eyeball, which can reduce the patient's discomfort and the risk of cross-infection, and can also enhance the patient's comfort and experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A stereoscopic view of a non-contact tonometer provided in a first viewing angle according to an exemplary embodiment of the present disclosure, wherein the base plate is not installed.

[0042] Figure 2 A stereoscopic view of a non-contact tonometer provided by an exemplary embodiment of the present disclosure under a second viewing angle.

[0043] Figure 3 This is a stereoscopic view of a non-contact tonometer provided by an exemplary embodiment of the present disclosure at a third viewing angle.

[0044] Figure 4 for Figure 1 A partial enlarged view of part A in the middle.

[0045] Figure 5 A cross-sectional view of a frame assembly of a non-contact tonometer provided in accordance with an exemplary embodiment of the present disclosure.

[0046] Figure 6 A stereoscopic diagram of the connection between a frame and a wearing assembly of a non-contact tonometer provided in accordance with an exemplary embodiment of the present disclosure.

[0047] In the figure: 10, frame assembly; 11, mirror frame; 111, first frame body; 112, connecting part; 113, second frame body; 12, shell; 121, bottom plate; 122, side plate; 13, accommodating chamber; 14, opening; 20, eye tracking mechanism; 21, LED screen; 22, image acquisition assembly; 221, camera; 222, shooting camera; 30, air supply pressure mechanism; 31, air pressure part; 32, adjustment assembly; 321, first joint; 322, first rotating arm; 323, second joint; 324, second rotating arm; 40, position sensor; 41, angle sensor; 50, wearing assembly; 51, elastic band; 52, hard-hair Velcro; 53, soft-hair Velcro; 60, shielding cover. DETAILED DESCRIPTION

[0048] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0049] In the description of the present disclosure, in the present disclosure, unless otherwise specified, "inside and outside" refer to the inside and outside of the corresponding component outline. In addition, the terms "first", "second" and the like are used to distinguish one element from another and have no order or importance.

[0050] In the description of the present disclosure, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "connected", and "installed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0051] like Figures 1 to 6 As shown, the present disclosure provides a non-contact tonometer, including a frame assembly 10, an eye tracking mechanism 20 and an air supply pressure mechanism 30. The frame assembly 10 includes a frame 11 and a shell 12. The shell 12 has a accommodating cavity 13. An opening 14 communicating with the accommodating cavity 13 is provided on the shell 12. The side of the frame 11 away from the patient's face is connected to the plane where the opening 14 is located. The eye tracking mechanism 20 includes an LED screen 21 and an image acquisition component 22. The image acquisition component 22 is arranged on the frame 11. The LED screen 21 is installed on the cavity wall of the accommodating cavity 13 away from the opening 14. The air supply pressure mechanism 30 is located in the accommodating cavity 13. The air supply pressure mechanism 30 includes a gas pressure piece 31 and an adjustment component 32. One end of the position adjustment piece is connected to the cavity wall of the accommodating cavity 13. The other end of the adjustment component 32 is provided with a gas pressure piece 31. The gas pressure piece 31 is used to emit a pulsed airflow to a preset position on the patient's eyeball. The adjustment component 32 is configured to be able to adjust the position of the gas pressure piece 31 in the horizontal direction and the vertical direction.

[0052] It should be understood that the working principle of the eye tracking mechanism 20 in the present disclosure can be: the eye image captured by the image acquisition component 22 (the camera 221 described below) can be transmitted to the image processing unit in the control system described below for analysis, and the key feature points of the eye (such as the center of the pupil, the corneal reflection point, etc.) can be extracted, and then the image of the LED screen 21 captured by the image acquisition component 22 (the shooting camera 222 described below) is used to provide an environmental reference point and can be transmitted to the control system for analysis. Specifically, the key feature points of the eye, including the edge of the pupil, the edge of the cornea, etc., can be extracted through image processing algorithms (such as edge detection, threshold segmentation, etc.). Among the extracted feature points, the highest convex part of the cornea, that is, the position of the corneal vertex, can be identified, so that the extraction of eye signs can be achieved. In addition, the image of the LED screen 21 captured by the image acquisition component 22 (the camera 222 described below) can be used to identify reference objects on the image of the LED screen 21, such as marks displayed on the screen, so as to establish an environmental coordinate system, match the coordinate system in the eyeball image with the environmental coordinate system, and map the movement direction of the eyeball to the real scene (LED screen 21) through a coordinate conversion algorithm (such as rigid body transformation, projection transformation, etc.), so that the eyeball signs can be extracted. The data of the eyeball image and the environmental image can be combined, and the patient's gaze direction can be determined by comparing the relationship between the position change of the eyeball and the reference object on the LED screen 21. Then, by calculating the position change of the eyeball relative to the reference object and the distribution of different marks on the LED screen 21, the specific position that the user is currently looking at can be inferred, that is, the position of the corneal vertex can be tracked in real time through the changes in the feature points in the eyeball image and the reference object position information in the LED screen 21 image. Among them, computer vision technology (such as Kalman filtering, particle filtering, etc.) can be used to track the movement of the eyeball in real time to ensure that the position change of the corneal vertex can be accurately captured even when the eyeball moves rapidly.

[0053] In addition, the preset position on the eyeball in the present disclosure can be understood as the corneal apex.

[0054] Through the above technical solution, the entire device can be stably worn on the patient's head and aligned with the patient's eyes through the provided frame 11. Through the provided LED screen 21, on the one hand, it can be used to display different marked images or videos, which can be used as a reference to compare and analyze with the image of the patient's eyeball spherical surface to help determine the current position and movement trajectory of the eyeball, and on the other hand, it can help the patient maintain a fixed eye direction. Through the provided image acquisition component 22, the position change of the corneal vertex can be accurately captured. Based on the position information of the corneal vertex, the following control system can adjust the position of the air pressure piece 31 through the adjustment component 32 to ensure that the pulsed airflow ejected by the air pressure piece 31 can always accurately hit the corneal vertex. In this way, the eyeball tracking mechanism 20 can track the movement of the eyeball in real time, and the position of the air pressure piece 31 can be dynamically adjusted through the adjustment component 32 according to the eyeball movement, which can ensure that each measurement can accurately hit the corneal vertex, which is conducive to improving the accuracy of the measurement. The patient can be guided to maintain a fixed eye direction through the LED screen 21, which can simplify the measurement process and improve the patient's comfort and cooperation. That is to say, the non-contact tonometer provided by the present invention can achieve accurate and reliable measurement of intraocular pressure through the coordinated work of the frame 11, the LED screen 21, the image acquisition component 22, the air supply pressure mechanism 30 and the control system described below. In addition, the device does not require direct contact with the patient's eyeball, which can reduce the patient's discomfort and the risk of cross-infection, and can also enhance the patient's comfort and experience.

[0055] In order to realize the automation and precise control of the whole measurement process, as an implementation method, Figures 1 to 4 As shown, the non-contact tonometer also includes a control system, which is electrically connected to the eye tracking mechanism 20 and the air pressure supply mechanism 30. With this design, the control system can automatically process image data and adjust the position of the air pressure member 31 in real time according to the data, which can reduce the need for manual intervention and improve the efficiency and consistency of measurement.

[0056] The control system is responsible for coordinating and managing the work of various components, including the eye tracking mechanism 20 and the air supply pressure mechanism 30. The control system may include a microprocessor (such as a single-chip microcomputer, an embedded computer), a memory, an input / output interface, a power module, etc. In addition, the control system runs dedicated software for image processing, data acquisition, data analysis, and control logic.

[0057] As an implementation method, Figure 1 and Figure 4As shown, the adjustment component 32 includes a first joint 321, a first rotating arm 322, a second joint 323 and a second rotating arm 324, the first joint 321 is connected to the top of the cavity wall of the accommodating cavity 13, the first end of the first rotating arm 322 is hinged to the first joint 321, the second joint 323 is axially rotatably connected to the second end of the first rotating arm 322, the first end of the second rotating arm 324 is hinged to the second joint 323, and the pneumatic part 31 is connected to the second end of the second rotating arm 324.

[0058] Among them, the combination of the first joint 321 and the first rotating arm 322 can realize the preliminary positioning of the pneumatic part 31 in the horizontal direction, and the combination of the second joint 323 and the second rotating arm 324 can further realize the adjustment of the pneumatic part 31 in the vertical direction and the fine adjustment in space. In other words, the combined design of multiple joints and rotating arms allows the pneumatic part 31 to be adjusted in multiple dimensions. On the one hand, the position of the pneumatic part 31 can be finely adjusted to ensure that each measurement can accurately hit the corneal apex. On the other hand, the pneumatic part 31 can be flexibly moved within a larger range to adapt to the changes in the eye position of different patients.

[0059] Optionally, the first joint 321 and the second joint 323 can be constructed as a spherical structure, so that the connected parts (the first rotating arm 322 and the second rotating arm 324) can rotate freely in three dimensions, that is, they can be fully adjusted in the three directions of X, Y, and Z. Such a design allows the pneumatic part 31 to be adjusted in a wider range in space to adapt to different positions and angle changes of the eyeball.

[0060] Optionally, the first joint 321, the first rotating arm 322, the second joint 323 and the second rotating arm 324 are all made of transparent materials, wherein the transparent material can reduce light reflection, ensure clear imaging of the camera 221 and the image acquisition component 22, and improve the accuracy of image processing. In addition, transparent materials are lighter than metal materials, which helps to reduce the weight of the equipment and improve the comfort of wearing. This setting can not only enhance the visibility and accuracy of the equipment, but also improve the convenience of maintenance and debugging, improve the user experience, and reduce the interference of light reflection, thereby making the non-contact tonometer more advantageous in clinical applications and scientific research.

[0061] As an embodiment, the adjustment component 32 may include a first driving component, a second driving component and a third driving component. The first driving component is connected to the first rotating arm 322 to drive the first rotating arm 322 to rotate relative to the shell 12 and change the angle between the first rotating arm 322 and the top of the cavity wall of the accommodating cavity 13. The second driving component is connected to the second rotating arm 324 to drive the second rotating arm 324 to rotate relative to the first rotating arm 322 and change the angle between the second rotating arm 324 and the first rotating arm 322. The third driving component is connected to the second joint 323 to drive the second joint 323 to rotate around its axis.

[0062] Among them, the first driving component can be an electric motor or a servo motor, and the position of the first rotating arm 322 relative to the housing 12 can be controlled by adjusting the angle of its output shaft, so that the initial positioning of the pneumatic component 31 in the horizontal direction can be achieved. The second driving component can also be an electric motor or a servo motor, and the position of the second rotating arm 324 relative to the first rotating arm 322 can be controlled by adjusting the angle of its output shaft, so that the adjustment of the pneumatic component 31 in the vertical direction can be achieved. The third driving component can be a stepping motor, and the axial rotation of the second joint 323 can be controlled by adjusting the angle of its output shaft, so that the fine adjustment of the pneumatic component 31 in space can be achieved, and it can be ensured that the pneumatic component 31 can be accurately aligned with the corneal vertex. The eye tracking data can be received in real time by the following control system, and according to the position information of the eyeball, the corresponding adjustment can be made by driving each driving component, and the rotation angle of each driving component can be accurately controlled by the following control system, so that the position of the pneumatic component 31 is always synchronized with the movement of the eyeball. That is, through the cooperation of the first driving component, the second driving component and the third driving component, the precise adjustment of the pneumatic component 31 in space is achieved. This design not only improves the accuracy and reliability of the measurement, but also enhances the applicability of the device and the comfort of the user. Through the design of the adjustment assembly 32 with multiple drive components, the non-contact tonometer can better adapt to the changes in the eye position of different patients, ensuring that each measurement can be accurately aligned with the corneal vertex.

[0063] In order to achieve accurate adjustment of the position of the gas pressure member 31, as an implementation method, Figure 4As shown, the tonometer also includes a position sensor 40 and an angle sensor 41. The position sensor 40 is mounted on the gas pressure piece 31 to detect the relative position of the gas pressure piece 31 relative to the preset position. The angle sensor 41 is mounted on the first joint 321 and the second joint 323 to respectively detect the rotation angle of the first joint 321 and the rotation angle of the second joint 323. Through the combination of the position sensor 40 and the angle sensor 41, the position and joint angle of the gas pressure piece 31 can be accurately detected. This design can ensure that the gas pressure piece 31 can be adjusted in real time according to the position change of the eyeball, thereby improving the accuracy and reliability of the measurement.

[0064] Among them, the position sensor 40 can be installed on the pneumatic component 31 to detect the relative position of the pneumatic component 31 relative to the preset position, that is, the position of the pneumatic component 31 can be monitored in real time to ensure that the pneumatic component 31 can be accurately aligned with the corneal apex.

[0065] Optionally, the position sensor 40 may be an optical sensor, a magnetic sensor, or a capacitive sensor, which is not limited in the present disclosure.

[0066] An angle sensor 41 may be installed on the first joint 321 and the second joint 323, respectively, to detect the rotation angle of the first joint 321 and the second joint 323. In other words, by monitoring the rotation angle of the joint in real time, the control system can ensure that the position of the pneumatic member 31 can be accurately adjusted.

[0067] Optionally, the angle sensor 41 may be an encoder, a gyroscope, or an optical encoder, which is not limited in the present disclosure.

[0068] As an implementation method, Figure 1 , Figure 4 as well as Figure 6As shown, the image acquisition component 22 includes a camera 221 and a shooting camera 222. The camera 221 is arranged on the side of the frame 11 facing the patient's face. The camera 221 is used to collect images on the spherical surface of the eyeball and capture the image changes of the cornea of ​​the eyeball under the action of the pulsed airflow. The shooting camera 222 is arranged on the side of the connection part 112 facing the accommodating cavity 13. The shooting camera 222 is used to capture images of the surrounding environment and cooperate with the camera 221 to determine the gaze position of the patient's eyes. Through the combination of the camera 221 and the shooting camera 222, on the one hand, the non-contact tonometer can realize accurate tracking of the eyeball and capture the image changes of the cornea under the action of the pulsed airflow, which can not only improve the accuracy and reliability of the measurement, but also enhance the automation of the equipment and the comfort of the user. On the other hand, the non-contact tonometer can better adapt to the changes in the eyeball position of different patients, and can ensure that each measurement can be accurately aligned with the corneal vertex.

[0069] The camera 221 is arranged on the side of the frame 11 facing the patient's face, and can be located on the inner side of the frame 11 so as to be close to the patient's eyes. The camera 221 is used to collect images on the spherical surface of the eyeball in real time, including the position of the eyeball, the movement trajectory of the eyeball, and the shape of the cornea.

[0070] Optionally, the camera 221 may be a high-resolution CMOS or CCD camera 221 with a high frame rate and low latency to ensure real-time performance and accuracy.

[0071] The shooting camera 222 is arranged on the side of the frame 11 (specifically the connection part 112 described below) facing the accommodating cavity 13, and can be located inside the device, and used in conjunction with the camera 221. The shooting camera 222 is used to capture the image changes of the cornea of ​​the eyeball under the action of the pulsed airflow, including the degree of corneal concavity and rebound speed.

[0072] Optionally, the shooting camera 222 may be a high-speed camera 221 having a high frame rate and a high resolution to capture subtle corneal changes.

[0073] In addition, the non-contact tonometer in the present disclosure has two image acquisition tasks of eye tracking and corneal change capture.

[0074] Among them, the working principle of eye tracking can be: the camera 221 can collect the image of the eyeball in real time, including the feature points of the pupil, iris and cornea, and then extract the key feature points of the eyeball, such as the pupil center, corneal edge, etc. through image processing algorithms (such as edge detection, feature point recognition, etc.). Finally, the control system can calculate the position and movement trajectory of the eyeball in real time based on the extracted feature points to ensure that the pneumatic part 31 can be accurately aligned with the corneal vertex.

[0075] The working principle of corneal change capture can be: when the position of the air pressure piece 31 is adjusted to the right position, the control system starts the air supply pressure mechanism 30, and the air pressure piece 31 emits a pulsed airflow to a preset position on the patient's eyeball, and then the camera 222 continuously captures the image changes of the cornea before and after the pulsed airflow is emitted, including the degree of corneal concavity and rebound speed. Finally, the control system analyzes the image changes captured by the camera 222 through an image processing algorithm, and calculates the degree of corneal deformation and rebound speed.

[0076] As an implementation method, Figure 1 to Figure 2 As shown, the housing 12 is formed into a hollow frustum structure. In a first direction, the cross-sectional area of ​​the housing 12 gradually increases in a direction away from the mirror frame 11. The housing 12 includes a bottom plate 121 and a plurality of side plates 122 surrounding the bottom plate 121. The bottom plate 121 and the plurality of side plates 122 together define a receiving cavity 13. The LED screen 21 is mounted on a side of the bottom plate 121 close to the receiving cavity 13. In other words, the LED screen 21 is mounted on the large-diameter end of the housing 12, and the opening 14 is formed at the small-diameter end of the housing 12.

[0077] The first direction may be understood as a direction perpendicular to the patient's face.

[0078] Among them, the LED screen 21 is installed at the large diameter end of the shell 12, which can be away from the patient's eyes, and the screen's obstruction of the patient's field of vision can be reduced. In this way, when the patient looks at the instructions on the screen, the field of vision is wider and will not feel uncomfortable because the screen is too close. In addition, the patient can look at the instructions on the screen more naturally without drastically adjusting the position of the head or eyes, which helps to improve the accuracy of eye tracking and the comfort of the patient.

[0079] Among them, since the large diameter end of the housing 12 is far away from the patient's eyes, it can better isolate the interference of the external environment. For example, the light of the LED screen 21 will not directly shine on the patient's eyes, reducing the impact of halo and glare. In addition, the LED screen 21 can be far away from the air pressure part 31 and the airflow path, reducing the interference of the LED screen 21 on the airflow, ensuring that the airflow can be transmitted to the cornea more stably and accurately.

[0080] As an implementation method, Figure 1 and Figure 6As shown, the non-contact tonometer also includes a wearing component 50, the frame 11 includes a first frame body 111, a connecting portion 112 and a second frame body 113, the first frame body 111, the connecting portion 112 and the second frame body 113 are connected in sequence along the horizontal direction, the first frame body 111 and the second frame body 113 are respectively opposite to one eye of the patient, the wearing component 50 includes two elastic bands 51, a hard-hair Velcro 52 and a soft-hair Velcro 53, the two elastic bands 51 are respectively connected to the first frame body 111 and the second frame body 113, one of the two elastic bands 51 is provided with a hard-hair Velcro 52 at one end away from the frame 11, and the other of the two elastic bands 51 is provided with a soft-hair Velcro 53 at one end away from the frame 11. Specifically, the non-contact tonometer is worn on the patient's head, ensuring that the frame 11 is close to the face, so that the first frame 111 and the second frame 113 are respectively aligned with one of the patient's eyes, and then the two elastic bands 51 are stretched and adjusted to make the device fit tightly to the patient's head to ensure the stability of the device, and finally, one end of the hard-haired Velcro 52 is fitted with the other end of the soft-haired Velcro 53 to ensure that the elastic band 51 is firmly fixed.

[0081] The design of the elastic band 51 can ensure the stability of the device when worn, and can prevent the device from moving or falling off during the measurement process. In addition, by adjusting the length of the elastic band 51, the patient can make a personalized adjustment according to the size of his or her head circumference to ensure the fit and comfort of the device.

[0082] Among them, the use of Velcro makes it very convenient to wear and remove the device, and patients can do it by themselves without the assistance of others.

[0083] As an implementation method, Figures 2 to 3 As shown, the non-contact tonometer also includes two shielding covers 60, one of the two shielding covers 60 is arranged on the side of the first frame 111 facing the patient's face, and is used to enclose between the first frame 111 and the patient's face, and the other of the two shielding covers 60 is arranged on the side of the second frame 113 facing the patient's face, and is used to enclose between the second frame 113 and the patient's face.

[0084] The shielding function of the shielding cover 60 can reduce the leakage of airflow from the gap between the frame and the patient's face during the measurement process, ensuring that the airflow can be accurately transmitted to the cornea. In addition, the shielding cover 60 can not only reduce the interference of external light on the camera 221 and the shooting camera 222, ensuring the clarity and accuracy of image acquisition, but also reduce the interference of external airflow, ensuring that the airflow can be stably transmitted to the cornea, and improving the reliability of measurement.

[0085] The shield 60 can be made of a soft and elastic material, such as silicone, rubber or soft plastic, to ensure comfort and sealing. The shield 60 can be designed to have a shape that matches the contour of the patient's eye socket, usually in an arc or semicircular shape, to ensure a close fit with the face.

[0086] like Figures 1 to 6 As shown, the present disclosure also provides a non-contact intraocular pressure measurement method, based on the above-mentioned non-contact intraocular pressure meter, comprising the following steps:

[0087] Step 1: Start the eye tracking mechanism 20 and guide the patient to look at a fixed point or move his / her sight along the instructions on the screen through the LED screen 21.

[0088] Specifically, the patient wears the non-contact tonometer, ensuring that the frame 11 is close to the face and the device is stably worn. The device is powered on, the control system is started, and the device enters the standby state. The eye tracking mechanism 20 is started, and specific patterns or light spots are displayed on the LED screen 21 to guide the patient to look at these targets. The patient needs to look at a fixed point on the screen or move his / her eyes following the instructions on the screen.

[0089] Step 2: Use the image acquisition component 22 to capture the image on the eyeball surface and the image of the LED screen 21 in real time, and calculate the gaze direction and gaze point of the eyeball through the image processing algorithm in the control system.

[0090] Specifically, the image acquisition component 22 (such as the camera 221) is used to capture the image of the eyeball in real time. At the same time, the image of the LED screen 21 is collected. The image processing algorithm in the control system analyzes these images, calculates the gaze direction and gaze point of the eyeball, and ensures that the pneumatic component 31 can accurately align with the target position.

[0091] Step 3: Based on the position information provided by the eye tracking mechanism 20, the control system adjusts the position of the pneumatic component 31 through the adjustment component 32 to ensure that the pneumatic component 31 can accurately align with the preset position of the eyeball.

[0092] Specifically, according to the position information provided by the eye tracking mechanism 20, the control system adjusts the position of the air pressure piece 31 through the adjustment component 32 (such as a motor or a servo system). The position and angle of the air pressure piece 31 are detected in real time through the position sensor 40 and the angle sensor 41 to ensure that the air pressure piece 31 is aligned with the preset position of the eyeball (usually the corneal vertex).

[0093] Step 4: Detect the relative position and angle of the pneumatic component 31 with respect to the preset position through the position sensor 40 and the angle sensor 41 to ensure that the pneumatic component 31 can be in the optimal launching position.

[0094] Specifically, the relative position of the pneumatic member 31 relative to the preset position is detected by the position sensor 40. The rotation angle of the pneumatic member 31 is detected by the angle sensor 41. If the position or angle is incorrect, the control system will automatically make fine adjustments until the pneumatic member 31 reaches the optimal position.

[0095] Step 5: When the position and angle of the air pressure piece 31 are adjusted to the desired position, the control system starts the air supply pressure mechanism 30 to emit pulsed airflow to the preset position through the air pressure piece 31 .

[0096] Specifically, when the position and angle of the air pressure piece 31 are adjusted to the right position, the control system starts the air supply pressure mechanism 30. The air pressure piece 31 emits a pulsed airflow to a preset position of the eyeball (which can be understood as the corneal vertex). This airflow will cause a slight depression of the cornea.

[0097] Step 6: The image acquisition component 22 continues to capture the image changes of the eyeball under the action of the pulsed airflow, and records the degree of corneal concavity and rebound speed.

[0098] Specifically, the image acquisition component 22 continues to capture the image changes of the eyeball under the action of the pulsed airflow, and especially records the degree of corneal concavity and rebound speed. These data will be used for subsequent analysis.

[0099] Step 7: The control system analyzes the image data through a built-in algorithm, and calculates the value of the intraocular pressure based on the intensity of the pulsed airflow and the response of the eyeball.

[0100] Specifically, the control system analyzes the image data through built-in algorithms. Combined with the intensity of the pulsed airflow and the reaction of the eyeball, the value of the intraocular pressure is calculated. These algorithms are usually based on physical models and a large amount of experimental data.

[0101] Step 8: Repeat steps 3 to 7 to get the average value.

[0102] Specifically, in order to obtain more accurate results, it is usually necessary to repeat steps 3 to 7 multiple times. The average of multiple measurements is taken as the final intraocular pressure value. This helps to reduce the error of a single measurement and improve the stability of the measurement.

[0103] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0104] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0105] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A non-contact intraocular pressure measuring instrument, characterized in that: It comprises a frame assembly (10), an eye tracking mechanism (20) and an air supply pressure mechanism (30); The frame assembly (10) comprises a spectacles frame (11) and a shell (12); the shell (12) has a receiving cavity (13); an opening (14) communicating with the receiving cavity (13) is provided on the shell (12); a side of the spectacles frame (11) facing away from the patient's face is connected to a plane where the opening (14) is located; The eye tracking mechanism (20) comprises an LED screen (21) and an image acquisition component (22), wherein the image acquisition component (22) is arranged on the mirror frame (11), and the LED screen (21) is mounted on a cavity wall of the accommodating cavity (13) away from the opening (14); The air supply pressure mechanism (30) is located in the accommodating cavity (13), and comprises an air pressure piece (31) and an adjusting component (32), one end of the adjusting component (32) is connected to the cavity wall of the accommodating cavity (13), and the other end of the adjusting component (32) is provided with the air pressure piece (31), the air pressure piece (31) is used to emit a pulsed airflow to a preset position on the patient's eyeball, and the adjusting component (32) is configured to be able to adjust the position of the air pressure piece (31) in the horizontal direction and the vertical direction; The adjustment component (32) comprises a first joint (321), a first rotating arm (322), a second joint (323) and a second rotating arm (324); the first joint (321) is connected to the top of the cavity wall of the accommodating cavity (13); the first end of the first rotating arm (322) is hinged to the first joint (321); the second joint (323) is axially rotatably connected to the second end of the first rotating arm (322); the first end of the second rotating arm (324) is hinged to the second joint (323); and the pneumatic component (31) is connected to the second end of the second rotating arm (324).

2. The non-contact intraocular pressure measuring instrument according to claim 1, characterized in that: The adjustment assembly (32) comprises a first driving component, a second driving component and a third driving component; The first driving component is in transmission connection with the first rotating arm (322) so as to drive the first rotating arm (322) to rotate relative to the housing (12) and change the angle between the first rotating arm and the top of the cavity wall of the accommodating cavity (13); The second driving component is transmission-connected to the second rotating arm (324) to drive the second rotating arm (324) to rotate relative to the first rotating arm (322) and change the angle between the second rotating arm (324) and the first rotating arm (322); The third driving component is in transmission connection with the second joint (323) to drive the second joint (323) to rotate around its axial direction.

3. The non-contact intraocular pressure measuring instrument according to claim 2, characterized in that: The intraocular pressure measuring instrument further comprises a position sensor (40) and an angle sensor (41); The position sensor (40) is mounted on the pneumatic component (31) to detect the relative position of the pneumatic component (31) relative to the preset position; The angle sensor (41) is installed on both the first joint (321) and the second joint (323) to detect the rotation angle of the first joint (321) and the rotation angle of the second joint (323) respectively.

4. The non-contact intraocular pressure measuring instrument according to claim 1, characterized in that: The image acquisition component (22) comprises a camera (221) and a shooting camera (222); The camera (221) is arranged on a side of the frame (11) facing the patient's face, and the camera (221) is used to collect images on the spherical surface of the eyeball and to capture image changes of the cornea of ​​the eyeball under the action of the pulsed airflow; The shooting camera (222) is arranged on a side of the mirror frame (11) facing the accommodating cavity (13), and the shooting camera (222) is used to capture images of the surrounding environment and cooperate with the camera (221) to determine the gaze position of the patient's eyes.

5. The non-contact intraocular pressure measuring instrument according to claim 1, characterized in that: The shell (12) is formed into a hollow frustum structure, and in a first direction, the cross-sectional area of ​​the shell (12) gradually increases in a direction away from the mirror frame (11); The housing (12) comprises a bottom plate (121) and a plurality of side plates (122) surrounding the bottom plate (121); the bottom plate (121) and the plurality of side plates (122) together define the accommodating cavity (13); and the LED screen (21) is mounted on a side of the bottom plate (121) close to the accommodating cavity (13).

6. The non-contact intraocular pressure measuring instrument according to claim 1, characterized in that: The non-contact tonometer further comprises a wearing component (50); the frame (11) comprises a first frame body (111), a connecting portion (112) and a second frame body (113); The first frame (111), the connecting portion (112), and the second frame (113) are sequentially connected in a horizontal direction, and the first frame (111) and the second frame (113) are respectively opposite to one eye of the patient; The wearing assembly (50) comprises two elastic bands (51), a hard-hair Velcro (52) and a soft-hair Velcro (53); the two elastic bands (51) are respectively connected to the first frame (111) and the second frame (113); one end of the two elastic bands (51) away from the frame (11) is provided with the hard-hair Velcro (52); and the other end of the two elastic bands (51) away from the frame (11) is provided with the soft-hair Velcro (53).

7. The non-contact intraocular pressure measuring instrument according to claim 6, characterized in that: The non-contact tonometer also includes two shielding covers (60); One of the two shielding covers (60) is arranged on a side of the first frame (111) facing the patient's face, and is used to enclose between the first frame (111) and the patient's face; The other of the two shielding covers (60) is arranged on a side of the second frame (113) facing the patient's face, and is used to enclose between the second frame (113) and the patient's face.

8. The non-contact tonometer according to any one of claims 1 to 4, characterized in that: The non-contact tonometer also includes a control system; The control system is electrically connected to both the eye tracking mechanism (20) and the air supply pressure mechanism (30).

9. A non-contact intraocular pressure measurement method, characterized in that: The non-contact intraocular pressure measuring instrument according to any one of claims 1 to 8 comprises the following steps: Step 1: activating the eye tracking mechanism (20) and guiding the patient to gaze at a fixed point or to move his / her gaze following instructions on the screen through the LED screen (21); Step 2: using the image acquisition component (22) to capture the image on the eyeball surface and the image of the LED screen (21) in real time, and calculating the gaze direction and gaze point of the eyeball through the image processing algorithm in the control system; Step 3: Based on the position information provided by the eye tracking mechanism (20), the control system adjusts the position of the pneumatic component (31) through the adjustment component (32) to ensure that the pneumatic component (31) can accurately align with the preset position of the eyeball; Step 4: detecting the relative position and angle of the pneumatic component (31) relative to the preset position by means of a position sensor (40) and an angle sensor (41) to ensure that the pneumatic component (31) is in an optimal launching position; Step 5: When the position and angle of the air pressure piece (31) are adjusted to the desired position, the control system starts the air supply pressure mechanism (30) to emit a pulsed airflow to the preset position through the air pressure piece (31); Step 6: the image acquisition component (22) continues to capture the image changes of the eyeball under the action of the pulsed airflow, and records the degree of corneal concavity and rebound speed; Step 7: The control system analyzes the image data through a built-in algorithm, and calculates the value of the intraocular pressure by combining the intensity of the pulsed airflow and the reaction of the eyeball; Step 8: Repeat steps 3 to 7 to get the average value.

Images