System for collecting eyeball movement and head movement in real time

Abstract

The invention discloses a system for collecting eyeball movement and head movement in real time. The system comprises an eyeshade body, an eye movement camera system, a light source and three watching target sources. The eye movement camera system is used for collecting eyeball images of a user, and the light source provides illumination for eyeballs; the three watching target sources are arranged in the eyeshade body, and the three watching target sources comprise a front watching target source, a left watching target source and a right watching target source which are respectively used for providing visible targets of three different visual angles of the front, the left front and the right front of eyeballs at the photographing side; the eye movement camera system, the light source and the three watching target sources are installed on the same side of the eyeshade body and used for collecting eye movement images of a user. The system further comprises a head movement sensor which is installed on the eyeshade body. The head shaking inhibition test of three pairs of semicircular canals in different planes can be simultaneously realized, the head moving position of a user is recorded in real time, and the eye moving image of the user is acquired.

Description

[0001] This application is a divisional application of application number 201911030736.2, application date October 28, 2019, and invention name “A system for real-time collection of eye movements and head movements”. Technical Field

[0002] The invention relates to the technical field of image acquisition for testing eye movement information at close range, and in particular to a system for acquiring eye movement and head movement in real time. Background Art

[0003] The vestibule is an important system responsible for maintaining the balance of the human body, mainly composed of the peripheral vestibule and the central vestibule. The peripheral vestibule includes three pairs of semicircular canals and otolith organs. Once any of the three pairs of semicircular canals in the human body has a malfunction, it will lead to balance dysfunction, and then produce symptoms such as vertigo. Quantitative and qualitative testing of semicircular canal dysfunction is an important basis for doctors in vertigo-related departments such as otolaryngology and neurology to give patients a final diagnosis of the disease.

[0004] According to the frequency characteristics of the semicircular canal function, the current clinical examination of semicircular canal function mainly includes ultra-low frequency caloric test, low to medium frequency rotating chair test, high frequency vestibular self-rotation test, head impulse test (HIMP) and head impulse suppression test (SHIMP). Among them, the caloric test and rotating chair test can only check the function of the horizontal semicircular canal, and cannot perform functional tests on the remaining two pairs of semicircular canals. The vestibular self-rotation test, head impulse test and head impulse suppression test can all measure the function of all six semicircular canals. The most important functional frequency band of the human body in life is the high frequency of 2-6Hz, and high-frequency examinations have greater reference value than low-frequency examinations.

[0005] High-frequency semicircular canal function tests mainly rely on the measurement of the vestibular-ocular reflex (VOR). In order to have a clear vision during the head rotation process, during the high-speed head rotation, the human eyeball must compensate for the angle of head rotation in a very short time (within 15ms, generally 8ms), that is, rotate in the opposite direction of the head rotation at the same speed and the same angle as the head rotation. In this way, in a very short time after the head rotates, the eyeball can still firmly stare at the object before the head rotates, thereby maintaining visual stability. This process is achieved through the vestibular-ocular reflex. The function of the semicircular canal plays an extremely important role in the vestibular-ocular reflex. The strength of the semicircular canal function can be inferred by measuring the vestibular-ocular reflex function. In the high-frequency vestibular self-rotation test, head-jerk test and head-jerk inhibition test, the subject's head is rotated quickly while the software records and analyzes whether the subject's eyeball can move in the opposite direction and speed in time to obtain the corresponding semicircular canal function data. The vestibular self-rotation test is also known as the active head-jerk test. The subject actively and quickly rotates his head according to the sound provided by the system. In this process, in addition to the vestibular-ocular reflex, other stimuli given by the central nervous system during subjective rotation are also involved. Therefore, the academic community is still controversial about its results. In contrast, the head-jerk test and the head-jerk inhibition test require the doctor to quickly, unpredictably, and at a small angle to shake the subject's head. In a very short period of time, the subject's eye movement is only involved in the vestibular-ocular reflex. The test results are not easily affected by other factors and are very reliable.

[0006] The head thrust test began to be used in clinical examinations in 2009. Due to its convenient operation, inexpensive equipment price, comfortable subject experience (compared to the hot and cold test which can easily induce nausea and vomiting in patients), and the ability to provide quantitative test results for three pairs of semicircular canals, the head thrust test has been rapidly promoted around the world and has become another reliable supplement or even alternative test after the hot and cold test, which was once the gold standard for semicircular canal examinations. In the head thrust test, the subjects are required to stare closely at a fixed visual target in front of them. Due to the existence of the vestibular-ocular reflex, patients with normal semicircular canal function can stare at the visual target firmly during passive head thrusts in any semicircular canal plane, while patients with abnormal function cannot generate eye movements that can offset head movements through the vestibular-ocular reflex, and thus cannot stare at the visual target. Then, the brain processes visual signals (more than 70ms) in the second time and finds that the visual target is not fixed, so a second corrective eye movement is performed. This is the corrective saccade that can be recorded in the examination of patients with abnormal semicircular canal function.

[0007] In 2016, MacDougall and other researchers proposed the head impulse inhibition test based on the head impulse test. The operating procedures of the head impulse inhibition test are basically the same as those of the head impulse test. The only difference is that in the head impulse inhibition test, the subjects need to stare closely at the visual target that rotates with the head, while in the head impulse test, the subjects only need to stare at the fixed visual target. Due to the existence of the vestibular-ocular reflex, the subject's eyes still stare at the position of the visual target at the moment of the start of the head impulse during the first time of passive head impulse (within 15ms). Afterwards, the eyes find that the visual target has rotated, and then perform corrective saccades in the second time (after 70ms). Therefore, unlike the head impulse test, only patients with abnormal semicircular canal function can observe corrective saccades. In the head impulse inhibition test, corrective saccades can also be recorded in normal people. The head impulse test and the head impulse inhibition test are based on the same inspection principle, and the results of the inspection can complement and confirm each other.

[0008] Since SHIMP saccades usually occur after the end of head movement (with a greater delay than HIMP saccades), they can eliminate the influence of covert saccades and improve the accuracy of VOR gain calculation compared to HIMP. Especially for patients in the acute stage of vestibular neuritis, SHIMP eliminates the interference caused by spontaneous nystagmus. Therefore, the SHIMP head impulse inhibition test has a high clinical application value.

[0009] The head impulse inhibition test requires the visual target to rotate with the head. The current design mode of commercial products is to let the subject wear a laser on his head, so that the laser visual target can rotate with the subject's head when the subject's head is rotated. However, due to the different directions of the three pairs of semicircular canal planes, the current laser can only check one pair of horizontal semicircular canals, and the projection system of the existing technical solution has high requirements for the use environment. It is necessary to set a suitable projection distance, otherwise it will seriously affect the use of patients with myopia, amblyopia, etc., and the projection environment must be free of obstructions, otherwise shadows will be generated and it cannot be used normally. Therefore, the promotion of the head impulse inhibition test is greatly restricted.

[0010] A flip-up nystagmus instrument disclosed in Chinese patent document CN106491074A includes an eye mask main unit and an eye mask support unit; the light source is used to illuminate the eyeball area, and the camera is used to collect nystagmus images; the camera and light source are installed on one side of the mask frame, namely the recording side, for collecting separate images of an eyeball; the eye mask main unit and the eye mask support unit are detachably arranged, and can be installed on the eye mask support unit to be rotated left and right. The main technical features of this technical solution are: the infrared light source provides illumination for the eyeball, the camera collects nystagmus images, and the eye mask main unit is detachably installed on the eye mask support unit, so that nystagmus collection can be selected for the left or right eye according to clinical needs. However, the above technical solution can only be applied to nystagmus collection in common vestibular function tests such as visual motion tests and saccade tests, and cannot be applied to head impulse inhibition tests.

[0011] A head-shaking experiment auxiliary device disclosed in Chinese patent document CN107692971A includes a bracket fixed on the back of a chair, a scale connected to the upper part of the bracket, and a pointer fixed to the head of a subject by a fixing device, wherein the scale includes a vertical scale and a horizontal scale perpendicular to each other, one end of the vertical scale is connected to the bracket, and the other end is connected to the middle of the horizontal scale, and a long slot hole for passing the pointer and connecting with each other is opened in the middle of the vertical scale and the horizontal scale. The main technical features of the technical scheme are: the bracket and the scale are installed on the back of the chair, and the pointer is set on the head of the subject. During the test, the subject's head is tilted forward and swung left and right, and the pointer can indicate the angle on the scale. It is simple and practical, avoids test errors, and improves the test effect. However, this technical scheme can only indicate the head movement angle during the head-shaking test, and the accuracy is low.

[0012] The head-mounted device for measuring the eye movement of a user disclosed in Chinese patent document CN105615826A comprises: a frame; a camera system including a first camera, wherein the camera system is configured to obtain a first set of images of the first eye of the user; and a projection system for projecting a first projection, wherein the first projection comprises: a visible target in the field of view of the first eye when the user wears the head-mounted device, wherein the projection system is configured to move the visible target relative to the head-mounted device. The technical solution comprises that the projection system is configured to move the visible target relative to the head-mounted device. The technical solution is mainly used for nystagmus collection in common vestibular function tests such as visual motion tests and saccade tests; when it is applied to the head impulse suppression test (SHIMP), the technical limitation of the projection system can only check a pair of horizontal semicircular canals, and fails to implement the head impulse suppression test of three pairs of semicircular canals in different planes. Summary of the invention

[0013] The purpose of the present invention is to provide a system for real-time collection of eye movements and head movements, which can realize head impulse inhibition test in three pairs of semicircular canals in different planes (including horizontal semicircular canal plane, LARP plane and RALP plane), record the user's head movement position in real time, and collect the user's eye movement images.

[0014] To achieve the above-mentioned purpose, the system for collecting eye movement and head movement in real time of the present invention adopts the following technical scheme: a system for collecting eye movement and head movement in real time, comprising an eye mask body, an eye movement camera system, a light source and three gaze target sources; the eye movement camera system is used to collect the user's eye image, the light source provides lighting for the eye, the gaze target source is arranged in the eye mask body, the three gaze target sources include a front gaze target source, a left front gaze target source and a right front gaze target source, which are respectively used to provide visual targets in three different viewing angles of the front, left front and right front of the eyeball on the recording side; the three gaze target sources are relatively fixed to the user's head to perform a head shaking inhibition test; the eye movement camera system, the light source and the three gaze target sources are installed on the same side of the eye mask body to collect the user's eye movement image; the system for collecting eye movement and head movement in real time also includes a head movement sensor, the head movement sensor is installed on the eye mask body, and the head movement sensor records the position of the system for collecting eye movement and head movement in real time, thereby reflecting the forward tilt angle and left and right shaking angle of the head in real time.

[0015] As a further improvement of the above technical solution, three fixation target sources are respectively set at the user's bilateral horizontal semicircular canal plane, left anterior / right posterior semicircular canal plane and right anterior / left posterior semicircular canal plane, thereby providing more accurate visual targets of three specific perspectives required for the head impulse inhibition test in three pairs of semicircular canal planes (including the horizontal semicircular canal plane, LARP plane and RALP plane).

[0016] As a further improvement of the above technical solution, as a further improvement of the above technical solution, the eye mask body is symmetrical up and down.

[0017] As a further improvement of the above solution, the front-looking target source is installed on the edge of the eye-movement camera system, and is reflected by the half-reflective half-mirror on the eye mask body to form an image in front of the eyeball's sight line on the recording side;

[0018] As a further improvement of the above solution, the left front gaze target source is installed on the outer edge of the recording side of the eye mask body, in the left front sight direction of the eyeball on the recording side;

[0019] As a further improvement of the above solution, the right front gaze target source is installed on the inner edge of the recording side of the eye mask body, in the right front sight direction of the eyeball on the recording side;

[0020] As a further improvement of the scheme, the left front gaze target source provides a visible target 45° in front of the left side of the eye's line of sight on the recording side, or a visible target at any viewing angle within the range of 0°-55° in the left front; the right front gaze target source provides a visible target 45° in front of the right side of the eye's line of sight on the recording side, or a visible target at any viewing angle within the range of 0°-55° in the right front; the three gaze target sources provide visible targets at three unique viewing angles, thereby being able to simultaneously realize head-jerk inhibition tests on three pairs of semicircular canal planes (including the horizontal semicircular canal plane, the LARP plane, and the RALP plane), record the user's head movement position in real time, and collect the user's eye movement images.

[0021] As a further improvement of the above technical solution, preferably, the system for real-time collection of eye movements and head movements can be designed to be bilaterally symmetrical, that is, the left and right eyes respectively include an eye movement camera system, a light source and three gaze target sources, which can provide binocular visual targets and collect binocular eye movements simultaneously during the head-jerk inhibition test.

[0022] As a further improvement of the above technical solution, the light source includes a light source A and a light source B, and the light source A and the light source B are symmetrically installed in front of the eyeball on the recording side of the eye mask body.

[0023] As a further improvement of the above technical solution, a filter lens is provided on the eye movement camera system, and the filter lens is focal-length adjusted by a focusing module.

[0024] As a further improvement of the above technical solution, the recording side of the eye mask body further includes a beam splitter and / or a light shield. The light shield is used to block external light when a dark field test is required; the beam splitter can transmit light except the infrared band and reflect infrared light, and is used to change the infrared light path reflected from the eyeball to the camera. The beam splitter reflects infrared light but visible light can pass normally, so that when the light shield is removed, the patient can see the visual targets used for different tests through the beam splitter.

[0025] As a further improvement of the above technical solution, the eye mask body is fixed to the user's head by a fixing belt.

[0026] Compared with the prior art, the beneficial effects of the present invention are: first, the technical solution of the head-mounted device for measuring the user's eye movement is mainly used for the nystagmus collection of common vestibular function tests such as visual kinematic tests and saccade tests; when it is applied to the head impulse suppression test (SHIMP), the technical limitation of the projection system can only check one pair of horizontal semicircular canals, and the head impulse suppression test of three pairs of semicircular canals in different planes cannot be realized. The present invention is provided with a fixed gaze target source that provides three specific viewing angles of visible targets, which can realize the head impulse suppression test of three pairs of semicircular canals in different planes (including the horizontal semicircular canal plane, the LARP plane and the RALP plane), record the user's head movement position in real time, and collect the user's eye movement image.

[0027] Secondly, compared with the head-mounted device technology for measuring the user's eye movement, the projection system of the existing technology has higher requirements for the use environment and needs to set a suitable projection distance, otherwise it will seriously affect the use of patients with myopia, amblyopia, etc., and the projection environment must be free of obstructions, otherwise shadows will be generated and it cannot be used normally. The present invention sets a gaze target source in the eye mask body to provide a visible target of the corresponding viewing angle, and has almost no requirements for the external use environment.

[0028] Third, compared with the head-mounted device technical solution for measuring the user's eye movement, since the existing technical solution adopts the projection system + visual technical solution, it has high requirements for the frame of the head-mounted device. During the SHIMP test, it is necessary to ensure that the first camera system has an open viewing angle of 45 degrees on the left and right sides of the first eyeball. There is currently no good solution for the hardware design of the frame. The present invention sets a fixation target source in the eye mask body, does not require an open viewing angle, has a simple structural design, and is low in cost.

[0029] Fourthly, compared with the technical solution of head-mounted devices for measuring user eye movements, the high energy consumption and heat dissipation problems of the projection system of the existing technical solution seriously restrict the performance indicators of the head-mounted devices, and the user experience is not good. The present invention directly sets a fixation target source in the eye mask body, and provides visual targets of different viewing angles that are consistent with the planes of the three pairs of semicircular canals for the patient to fixate on so as to perform a head-jerk inhibition test. The fixation target source includes an LED lamp, and the visual target can be an image, pattern, figure, point or other stable visual target, with low energy consumption and small heat dissipation.

[0030] Fifth, the system for real-time collection of eye movement and head movement can be used in existing technical solutions such as head-mounted devices for measuring the user's eye movement, and the eye movement camera system can be configured to obtain a first set of images of the user's first eye and / or a second set of images of the second eye. The eye mask body is symmetrically flipped upside down and worn, and can be directly flipped and worn on the user's head. The eye movement images of the user's left eye or right eye can be selected according to clinical needs, and no configuration is required, which is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Shown is an exploded view of the system for real-time acquisition of eye movement and head movement of the present invention;

[0032] Figure 2 The figure shows an exploded front view of the system for real-time acquisition of eyeball movement and head movement of the present invention;

[0033] Figure 3 The figure is a cross-sectional view of the system for collecting eyeball movement and head movement in real time according to the present invention;

[0034] Figure 4 The figure is a top view of the system for collecting eyeball movement and head movement in real time according to the present invention;

[0035] Figure 5 Shown is a rear view of the system for real-time acquisition of eye movement and head movement of the present invention;

[0036] Figure 6 Shown is a schematic diagram of a focusing module of the present invention;

[0037] In the accompanying drawings: 1-eye mask body; 2-eye movement camera system; 31-light source A; 32-light source B; 41-front gaze target source; 42-left front gaze target source; 43-right front gaze target source; 5-head movement sensor; 6-beam splitter; 7-filter lens; 701-lens mount; 702-lens; 703-infrared filter; 704-lens gear; 8-adjustment module; 801-adjustment gear; 802-rotating shaft; 803-adjustment knob; 10-light shield. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] like Figure 1-6 As shown, a system for real-time acquisition of eye movement and head movement comprises an eye mask body 1, an eye movement camera system 2, a light source and a gaze target source; the eye movement camera system 2 is used to acquire the user's eye image, the light source provides illumination for the eye, and the gaze target source is fixed relative to the subject's head to perform a head-shaking inhibition test; the eye movement camera system 2, the light source and the gaze target source are installed on one side of the eye mask body 1, i.e., the recording side, for acquiring the user's eye movement image; wherein the gaze target source comprises a front gaze target source 41, a left front gaze target source 42 and / or a right front gaze target source 43; a visual target (i.e., a visual target) of a specific viewing angle can be provided by the gaze target source; the visual target is respectively located in front of, left front of and right front of the eye on the recording side.

[0040] That is to say, the gaze target source arranged in the eye mask body is used to generate a visible target of a specific viewing angle. In the present embodiment, the front gaze target source is mainly used to provide a visible target directly in front of the eyeball on the recording side; the left front gaze target source is mainly used to provide a visible target in front of the left side of the eyeball on the recording side; and the right front gaze target source is mainly used to provide a visible target in front of the right side of the eyeball on the recording side.

[0041] In the embodiment of the present application, the fixation target source is arranged on the recording side of the eye mask body (the eye movement camera system, the light source, and the three fixation target sources are installed on the same side of the eye mask body---the recording side), but the specific positions of the three fixation target sources on the recording side of the eye mask body are not limited, as long as the fixation target source in front can provide a visible target in front of the eyeball on the recording side, the fixation target source in the left front can provide a visible target in front of the left side of the eyeball on the recording side, and the fixation target source in the right front can provide a visible target in front of the right side of the eyeball on the recording side. By generating corresponding visible targets of specific viewing angles through these three fixed fixation target sources, the head shaking inhibition test of three pairs of semicircular canals in different planes (including the horizontal semicircular canal plane, the LARP plane, and the RALP plane) can be realized, the user's head movement position can be recorded in real time, and the user's eye movement image can be collected.

[0042] In one embodiment, the other side of the eye mask body 1 is the non-recording side, and the middle is the nose bridge part; the eye mask body 1 is symmetrically flipped upside down to be worn, so as to be suitable for the examination of the left eye or the right eye. The eye mask body 1 is flipped upside down and worn through the symmetrical structure of the upper and lower parts, so that a camera system can select the left eye or the right eye to collect eye movements according to clinical needs; at the same time, the nose bridge part of the eye mask body 1 is also a symmetrical structure of the upper and lower parts.

[0043] In another embodiment, both the left and right sides of the eye mask body (1) are recording sides, and each recording side is provided with the eye movement camera system (2), the light source and the three gaze target sources. That is to say, the system for real-time acquisition of eye movement and head movement of this embodiment can be designed to be bilaterally symmetrical, that is, the left and right eyes respectively include the eye movement camera system, the light source and the three gaze target sources, which can provide binocular visual targets and collect binocular eye movements simultaneously during the head-pulling inhibition test.

[0044] In other embodiments, the system for collecting eye movements and head movements in real time also includes a head movement sensor 5, which is installed on the eye mask body 1 to record the position of the system for collecting eye movements and head movements in real time, thereby reflecting the forward tilt angle and left and right swing angle of the head in real time.

[0045] In some embodiments, the front gaze target source (41), the left front gaze target source (42) and the right front gaze target source (43) are respectively arranged on the user's bilateral horizontal semicircular canal plane, the left anterior / right posterior semicircular canal plane and the right anterior / left posterior semicircular canal plane.

[0046] In the first embodiment mentioned above, the gaze target source includes a front gaze target source 41, a left front gaze target source 42 and / or a right front gaze target source 43; the gaze target source can provide a visible target of a specific viewing angle; the visible target is respectively located in front of, left front of and right front of the eyeball on the recording side;

[0047] In another embodiment of the present application, the front gaze target source 41 is installed on the edge of the eye movement camera system 2, and is imaged in front of the eyeball sight line on the recording side through the half-reflective half-mirror on the eye mask body 1; the left front gaze target source 42 is installed on the outer edge of the recording side of the eye mask body 1, and is located in the left front sight line direction of the eyeball on the recording side; the right front gaze target source 43 is installed on the inner edge of the recording side of the eye mask body 1, and is located in the right front sight line direction of the eyeball on the recording side, wherein the left front gaze target source 42 provides a visible target 45° in front of the left side of the eyeball sight line on the recording side or a visible target at any angle in the range of 0°-45° in the left front. The right front gaze target source provides a visible target 45° in front of the right side of the eyeball sight line on the recording side or a visible target at any angle in the range of 0°-45° in the right front; preferably, the visible target provided by the gaze target source is an LED light, an image, a pattern, a figure, a point or other stable visible target.

[0048] The light source includes a light source A31 and a light source B32, and the light source A31 and the light source B32 are symmetrically installed in front of the eyeball on the recording side of the eye mask body 1; the light source includes infrared light and / or LED light to provide illumination for the eyeball, and the light intensity of the light source to the left eye and the right eye is the same when the eye mask is turned over.

[0049] The eye movement camera system 2 is provided with a filter lens 7 , and the filter lens 7 is focal-adjusted by a focus adjustment module 8 . In the above embodiment, the filter lens 7 includes a lens holder 701, a lens 702, a lens gear 704 and an infrared filter 703; the lens holder 701 is connected to the eye-movement camera system 2, one end of the lens 702 is connected to the lens holder 701, the other end of the lens 702 is connected to the infrared filter 703, the lens gear 704 is arranged on a side away from the lens holder 701 and cooperates with the focus gear 801 of the adjustment module 8; the adjustment module 8 is also provided with a rotating shaft 802 and an adjustment knob 803; one end of the rotating shaft 802 is connected to the adjustment gear 801, and the other end of the rotating shaft 802 is connected to the adjustment knob 803. When in use, the adjustment knob 803 is rotated, and the rotating shaft drives the rotation of the adjustment gear 801. Since the adjustment gear 801 cooperates with the lens gear 704, the filter lens 7 can adjust the focal length. Wherein, the eye-movement camera 2 is arranged at a position conjugate with the patient's eye iris.

[0050] The recording side of the eye mask body 1 also includes a beam splitter 6 and a light shield 10. The light shield 10 is used to block external light when a dark field test is required; the beam splitter 6 can transmit light except the infrared band and reflect infrared light, and is used to change the infrared light path reflected from the eyeball to the camera. The beam splitter 6 reflects infrared light but visible light can pass normally, so that when the light shield 10 is removed, the patient can see the visual targets used for different tests through the beam splitter.

[0051] When in use, the eye mask body 1 can be configured to be fixed on the user's head through a fixing belt (shown in the accompanying drawings), and the fixing belt includes but is not limited to an adjustable belt / elastic belt / elastic fabric belt / fabric belt with Velcro, etc. The eye mask body 1 is in the form of but is not limited to swimming goggles / glasses / special glasses / VR glasses or other head-mounted devices. In a specific embodiment, the eye mask body 1 is designed as special glasses, which can be fastened to the user's head through an elastic non-slip fabric belt, so that the flip-type head shaking tester is relatively fixed to the user's head.

[0052] First, the technical solution of a head-mounted device for measuring the eye movement of a user is mainly used for the nystagmus collection of common vestibular function tests such as visual motion test and saccade test; when it is applied to the head impulse suppression test (SHIMP), the technical limitation of the projection system can only check one pair of horizontal semicircular canals, and the head impulse suppression test of three pairs of semicircular canals in different planes cannot be realized; the present invention is provided with three fixed gaze target sources, and then provides three visual targets of specific viewing angles, which can simultaneously realize the head impulse suppression test of three pairs of semicircular canals in different planes (including the horizontal semicircular canal plane, LARP plane and RALP plane), record the user's head movement position in real time, and collect the user's eye movement image.

[0053] Secondly, compared with the head-mounted device technology for measuring the user's eye movement, the projection system of the existing technology has higher requirements for the use environment and needs to set a suitable projection distance, otherwise it will seriously affect the use of patients with myopia, amblyopia, etc., and the projection environment must be free of obstructions, otherwise shadows will be generated and it cannot be used normally. The present invention sets a gaze target source that can provide three specific viewing angles of visible targets in the eye mask body, and has almost no requirements for the external use environment.

[0054] Third, compared with the head-mounted device technical solution for measuring the user's eye movement, the existing technical solution uses a projection system plus a visual technical solution, which has high requirements for the frame of the head-mounted device. During the SHIMP test, it is necessary to ensure that the first camera system has an open viewing angle of 45 degrees on the left and right sides of the first eyeball. There is currently no good solution for the hardware design of the frame. The present invention sets a fixation target source in the eye mask body, does not require an open viewing angle, has a simple structural design, and is low in cost.

[0055] Fourthly, compared with the technical solution of head-mounted devices for measuring the eye movement of users, the high energy consumption and heat dissipation problems of the projection system of the existing technical solution seriously restrict the performance indicators of the head-mounted devices, and the user experience is not good. The present invention directly sets three fixation target sources in the eye mask body, and provides visual targets with different viewing angles that correspond to the planes of three pairs of semicircular canals for patients to fixate on so as to perform a head-jerk inhibition test. The visual targets provided by the fixation target sources include LED lights, images, patterns, graphics, points or other stable visual targets, with low energy consumption and low heat dissipation.

[0056] Fifth, the system for real-time acquisition of eye movement and head movement can be used in existing technical solutions such as head-mounted devices for measuring the user's eye movement, and the eye movement camera system can be configured to obtain a first set of images of the user's first eye and / or a second set of images of the second eye. The eye mask body is symmetrically flipped upside down and worn, and can be directly flipped on the user's head. The eye movement images of the user's left eye or right eye can be selected according to clinical needs. No configuration is required, and it is more convenient to use. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A system for real-time acquisition of eye and head movements, characterized in that: The invention comprises an eye mask body (1), an eye movement camera system (2), a light source and three gaze target sources; the eye movement camera system (2) is used to collect an eyeball image of a user, and the light source provides lighting for the eyeball; the three gaze target sources are arranged in the eye mask body, and the three gaze target sources include a front gaze target source (41), a left front gaze target source (42) and a right front gaze target source (43), which are respectively used to provide visible targets at three different viewing angles, namely, front, left and right of the eyeball on the recording side; the eye movement camera system (2), the light source and the three gaze target sources are installed on the same side of the eye mask body (1) to collect an eye movement image of the user; the system also comprises a head movement sensor (5), and the head movement sensor (5) is installed on the eye mask body (1).

2. The system for collecting eye and head movements in real time according to claim 1, characterized in that: The three fixation target sources are respectively arranged at the user's bilateral horizontal semicircular canal plane, the left anterior / right posterior semicircular canal plane and the right anterior / left posterior semicircular canal plane.

3. The system for collecting eye and head movements in real time according to claim 1, characterized in that: The eye mask body is symmetrical up and down.

4. The system for collecting eye and head movements in real time according to claim 1, characterized in that: The forward-looking target source (41) is installed on the edge of the eye-movement camera system (2), and is imaged directly in front of the eyeball's sight line on the recording side through the half-reflecting half-mirror on the eye mask body (1).

5. The system for collecting eye and head movements in real time according to claim 1, characterized in that: The left front gaze target source (42) is installed on the outer edge of the recording side of the eye mask body (1) and is located in the left front sight direction of the eyeball on the recording side.

6. The system for collecting eye and head movements in real time according to claim 1, characterized in that: The right front gaze target source (43) is installed on the inner edge of the recording side of the eye mask body (1) and is located in the right front sight direction of the eyeball on the recording side.

7. The system for collecting eye and head movements in real time according to claim 1, characterized in that: The left and right sides of the eye mask body (1) are both recording sides, and each recording side is provided with the eye movement camera system (2), a light source and three gaze target sources.

8. The system for collecting eye and head movements in real time according to claim 1, characterized in that: The left front fixation target source (42) provides a visible target 45° to the left front of the eye's line of sight on the recording side or a visible target at any angle within the range of 0°-45° to the left front; the right front fixation target source (43) provides a visible target 45° to the right front of the eye's line of sight on the recording side or a visible target at any angle within the range of 0°-45° to the right front.

9. The system for collecting eye and head movements in real time according to claim 1, characterized in that: The eye movement camera system (2) is provided with a filter lens (7), and the filter lens (7) is capable of adjusting the focal length through a focus adjustment module (8).

10. The system for collecting eye and head movements in real time according to claim 1, characterized in that: The recording side of the eye mask body (1) further comprises a beam splitter (6) and / or a light shield (10).

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