CN105943327A - Vision-exercising health caring system with anti-dizziness device - Google Patents
Vision-exercising health caring system with anti-dizziness device Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H5/00—Exercisers for the eyes
- A61H5/005—Exercisers for training the stereoscopic view
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
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Abstract
The invention relates to a vision-exercising health caring system with an anti-dizziness device. The vision-exercising health caring system comprises a head wearing device, an image processing device in communication with the head wearing device, an intelligent control device in communication with the head wearing device and the image processing device, the anti-dizziness device and a remote terminal device, wherein the anti-dizziness device and the remote terminal device are in communication with the intelligent control device. The anti-dizziness device comprises a rotating controller installed on the head wearing device and internally provided with a future-head-position predicting unit; according to the picture angle change condition of a vision detection image or a vision health caring image to be played, the corresponding rotating angle of the vision detection image or the vision health caring image to be played is calculated through the future-head-position predicting unit so that the vision detection image or the vision health caring image can keep pace with the shifting movement state of the position and the angle of the head of a user. The user can conduct self-service vision detection and correction health caring, dizziness can be avoided during detection and health caring, and the true immediacy sense and the reality sense are achieved.
Description
Technical Field
The invention belongs to the technical field of vision health care, and particularly relates to a vision training and health care system.
Background
In recent years, the number of people suffering from myopia of teenagers is high and tends to increase year by year, the problem seriously influences the healthy growth of the teenagers, and meanwhile, the people in all the communities pay attention to the problem.
The current vision detection means mainly adopts visual chart identification or computer detection, and the visual chart identification mode has high requirements on light and distance, is generally only suitable for being mainly carried out by professional personnel in hospitals, physical examination centers, lens matching centers and the like, and is not suitable for home detection; the computer detection mode is not suitable for home purchase because the equipment is expensive. Because the two modes can not provide a simple, convenient and anytime and anywhere vision examination mode for people, many teenagers can not be detected in time, and thus the best opportunity for the intervention treatment of myopia is missed.
In addition, there are many rehabilitation methods for myopia, which are mainly classified into surgical treatment and physical treatment, and the surgical rehabilitation methods have a relatively high risk and may cause sequelae to teenagers. There are many physical rehabilitation methods on the market, such as: the eye exercises have a certain health care effect but rarely have a rehabilitation effect after being popularized for many years; the push-pull method of traditional Chinese medicine physiotherapy massage requires special care of professionals, and is inconvenient for mass popularization; the visual muscle energy training method is combined with the eye-nourishing vision-enhancing exercise method, which is a method with better effect at present.
For example, chinese patent publication No. CN101849881A discloses a method and an apparatus for myopia rehabilitation, which provides a method for myopia rehabilitation and health care, called "eye-beauty yoga", and a device containing stereo audio and video media software for the method, called "myopia rehabilitation apparatus", comprising a player and a stereo imaging optical device, wherein the player can play the stereo imaging software or disc, and output a stereo image signal to the optical device, and the optical device can display a stereo image. The optical device is a virtual large-visual-field, near-target and three-dimensional imaging video glasses device, and the rehabilitation induction of a user is realized through the rehabilitation device of the system, so that the aims of eye health care and myopia treatment rehabilitation are fulfilled. However, the invention still has the following disadvantages or shortcomings: (1) the invention can only carry out the training of correcting and recovering the myopia, but can not detect the myopia; (2) when the eyes continuously do extreme movement, the eyes can be very progressive to cause eye fatigue; (3) the principle of the invention is that corresponding breathing movement is matched while eyes do extreme movement, namely, the eyes require inspiration from the movement of muscular energy until the eyes hold breath, and can not exhale when the eyes return to a normal position, so that the invention has higher requirements on the coordination ability and the physical quality (particularly the vital capacity) of people; (4) the distance between the display screen of the video glasses and the eyes is short, so that the eyes can clearly see 'particles' on the screen, and the visual experience is poor; (5) the device cannot adjust the display of the image according to the head movement of the user, and may cause visual delay and further cause various discomforts such as nausea and dizziness to the user.
Also for example, chinese patent publication No. CN102895097A provides a network eye health care apparatus, which comprises a support and a display therapeutic body, wherein the support is provided with a driving device; the driving device is connected with the output end of the display treatment body, and the display treatment body is connected with the cloud server; the display treatment body downloads and displays a corresponding 3D vision physiology image in the cloud server according to the input myopia segmentation signal, and the control driving device drives the display treatment body displaying the 3D vision physiology image to perform required reciprocating motion on the support. The driving device drives the display treatment body displaying the 3D visual physiology image to perform the required reciprocating motion on the bracket, so that the crystalline lens of the eyes of the user performs the regular focusing motion, the ciliary muscle is always in the state of contraction-relaxation-contraction-relaxation, the elasticity of the ciliary muscle can be recovered and the crystalline lens can be recovered to the original position through a period of exercise treatment, the refractive power of the eye dioptric system is matched with the length of the axis of the eyes, and the object image accurately falls on the retina. However, the invention still has the following disadvantages or shortcomings: (1) the invention can only carry out the training of correcting and recovering the myopia, but can not detect the myopia; (2) the equipment has the advantages of complex structure, large volume and higher manufacturing, using and maintaining cost, and is not beneficial to being popularized to common families for use; (3) the user cannot use the health care apparatus freely at any time and any place like using a portable device, so that it is not easy to popularize to all users with myopia.
In summary, it is a problem to be solved in the industry that it is convenient and fast to provide a vision training and health care system and method capable of detecting vision and providing vision health care at any time and any place.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a vision training and health care system with an anti-dizziness device, which can realize vision detection for a user at any time and any place and provide a vision health care scheme for the user according to vision detection data of the user.
In order to achieve the above object, the present invention provides a vision training health system having an anti-dizziness device, comprising: the system comprises head-mounted equipment, intelligent control equipment in communication connection with the head-mounted equipment and anti-dizziness equipment in communication connection with the intelligent control equipment; the head-mounted equipment is used for displaying the vision detection image or the vision health-care image to a user, tracking the offset motion of the head position and the angle of the user and transmitting the offset motion state of the head position and the angle of the user to the intelligent control equipment; the intelligent control equipment is used for providing a mode for selecting detection or health care for a user, sending a vision detection image or a vision health care image to the head-mounted equipment according to the mode selected by the user, and receiving the deviation motion state of the head position and the angle of the user transmitted by the head-mounted equipment so as to control the image processing equipment and the anti-dizziness equipment to coordinate; the anti-dizziness device comprises a rotation controller which is arranged on the head-wearing device and is internally provided with a head future position prediction unit, wherein the rotation controller is used for calculating the corresponding rotation angle of the vision detection image or the vision health image to be displayed by the head future position prediction unit according to the change condition of the picture angle of the vision detection image or the vision health image to be played so as to keep synchronous with the offset motion state of the head position and the angle of a user.
Alternatively, the vision test image or the vision care image is set as an image having a fixed time-series relationship between the constituent frames to predetermine the angle change of the image frame to be played.
Optionally, the anti-dizziness device further comprises an anti-dizziness swivel chair, the anti-dizziness swivel chair comprises a swivel chair body, a rotating base supported at the bottom of the swivel chair body, and a rotating head support arranged at the top of the chair back of the swivel chair body and used for fixing the head of the user, wherein the rotating base and the rotating head support are in communication connection with the rotation controller, and the rotating base and the rotating head support are used for receiving the corresponding rotation angle of the vision detection image or the vision health image to be displayed calculated by the rotation controller and rotating by the rotation angle, so that the body rotation range and the head rotation range of the user are consistent with the rotation angle.
Alternatively, the range of rotation of the rotating base is 360 degrees.
Alternatively, the rotary base has an inertial sensor and a gravity sensor built therein, and the rotary head rest has an inertial sensor or an electromagnetic sensor built therein.
Optionally, sensors built into the rotary base and the rotary head holder are configured to send the sensed body motion parameters and head motion parameters to the rotary controller to calibrate the head future position prediction unit, respectively.
Optionally, the head-mounted device comprises: an image display device for receiving the vision test image or the vision care image and displaying the vision test image or the vision care image to a user; an audio playing device for playing a sound file synchronized with the vision test image or the vision care image displayed by the image display device; and the motion sensing device is used for tracking the offset motion of the head position and the head angle of the user and transmitting the offset motion state of the head position and the head angle of the user to the intelligent control equipment.
Preferably, the image display device comprises an LED display screen and convex lenses respectively corresponding to the left eye and the right eye of the user, wherein the LED display screen is used for split-screen displaying the image split-screen processed by the image processing device in different areas of the LED display screen corresponding to the left eye and the right eye of the user; the convex lens is used for projecting the images displayed by the split screen of the LED display screen to the left eye and the right eye of a user respectively.
Preferably, the resolution of the LED display screen is 1920 × 1080, the pixel frame of the LED display screen corresponding to the left eye or the right eye of the user is 960 × 1080, and the video quality played by the LED display screen is 1080 p.
Preferably, the angle of view of the convex lens is 110 °.
Optionally, the vision monitoring system further comprises an image processing device and a remote terminal device which are in communication connection with the intelligent control device, wherein the image processing device is used for receiving the vision detection image or the vision health image transmitted by the intelligent control device, and sending the vision detection image or the vision health image to the image display device after performing split screen processing; the remote terminal equipment comprises a plurality of intervention modules, and each remote terminal equipment is used for starting the corresponding intervention module according to the detection feedback of the intelligent control equipment to the vision detection image received by the user.
Preferably, the image processing device performs preprocessing reverse distortion on the received vision test image or vision care image, then compresses the image edge of the vision test image or vision care image after reverse distortion, and bends and deforms the image edge to neutralize the magnification effect of the convex lens.
Optionally, the motion sensing means is at least one or a combination of two or more of the following types of sensors: a mechanical sensor, an electromagnetic sensor, an optical sensor, an ultrasonic sensor, an inertial sensor, or a gravity sensor.
Optionally, the head-mounted device further comprises a sound collecting device for receiving voice feedback of the user for the vision test image or the vision care image and transmitting the voice feedback to the intelligent control device.
Preferably, the intervention module comprises an eye sensitivity enhancement module, an eye fatigue mitigation training module, a fitting module, and an ophthalmic disease control module.
Preferably, the vision test image is set to a virtual reality standard test symbol.
Preferably, the vision care image is set to be guided by changes in light, brightness, and depth of field to recover eye fatigue of the user.
Preferably, the variations in light, brightness, and depth of field include simulated focus, auto-zoom, and auto-hyperopic fogging.
Preferably, the smart control device comprises a laptop, a tablet computer or a smartphone.
Alternatively, the communication connections between the various components of the present invention may be wired and/or wireless.
The invention has the beneficial effects that: (1) the user can carry out vision examination at any time and any place without the assistance of medical care personnel and the limitation of doctor resources, thus realizing self-service vision examination; (2) according to the vision health-care image matched with the vision detection data provided by the user, the eyeball movement of the user is guided to relieve the asthenopia and the vision of the user is subjected to targeted intervention, so that the correction and rehabilitation of the vision of the user are realized; (3) the anti-dizziness equipment can ensure that the conversion angle and the corresponding sound of the picture of the vision detection image or the vision health-care image received by the user are synchronous with the body action of the user, thereby effectively avoiding the generation of dizzy, nausea or other uncomfortable feelings; (4) the vision detection image or the vision health image processed by the image processing equipment can make the user generate real presence and reality; (5) the vision training health-care system with the anti-dizziness device has the advantages that the devices are connected through the communication network, and the vision training health-care system can be used remotely without limitation of use time and place.
Drawings
Fig. 1 is a schematic configuration diagram of a vision exercise health system having an anti-glare device of the present invention.
Fig. 2 is a schematic structural diagram of the head set of the present invention.
Fig. 3 is a schematic structural view of the anti-glare swivel chair of the present invention.
Detailed Description
The invention will be further illustrated by reference to the drawings and examples, which are not intended to limit the invention in any way. Unless defined otherwise, all scientific and technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs and the relevant art.
As shown in FIG. 1, by way of a non-limiting example, the present invention provides a vision exercise healthcare system with an anti-glare device comprising: the head-mounted device 100, the intelligent control device 300, the anti-dizziness device 400 and the remote terminal device 500.
The head-mounted device 100 includes an image display device 101, an audio playing device 102, and a motion sensing device 103. The image display device 101 includes an LED display screen (not shown) and convex lenses (not shown) respectively corresponding to the left eye and the right eye of the user, the LED display screen can display the image split-screen processed by the intelligent control device 300 in different areas of the LED display screen corresponding to the left eye and the right eye of the user, although the LED display screen is very close to the eyes of the user, the close image can be clearly seen under the effect of the convex lenses. The angles of the pictures seen by the left and right eyes of the user are different, and the images displayed by the split screen of the LED display screen are respectively projected to the left eye and the right eye of the user by the arrangement of the two convex lenses, so that the things seen by the user are stereoscopic, a feeling similar to a real object is created, the object can be changed between far and near in the visual field range, and the virtual reality effect is generated. In addition, the visual angle of the diagonal line of the visual inspection image or the visual health image can reach 110 degrees, and the output image has no obvious distortion. While the user watches the vision test image or the vision health image, the audio playing device 102 can play the sound file synchronized with the vision test image or the vision health image displayed by the image display device 101 and play the instruction of the intelligent control device 300 for the user. When the user moves, the motion sensor 103 can track the head position and angular offset motion of the user, and transmit the head position and angular offset motion state of the user to the intelligent control device 300, so as to perform real-time feedback on the user's motion, and allow the user to interact with the virtual world, so that the user really feels that the user is in the virtual world. Meanwhile, the intelligent control device 300 controls the anti-dizzy device 400 according to the information provided by the motion sensor 103, so as to ensure that the change angle of the picture received by the user and the corresponding sound are synchronous with the body motion of the user, thus preventing the user from feeling dizzy and nausea.
Because use convex lens in image display device 101 to let the user possess bigger visual angle, but convex lens can make the picture distortion simultaneously, in order to offset these distortions, after carrying out the split screen processing to the visual acuity test image or the visual acuity health care image of intelligent control equipment 300 conveying, can be a reverse distortion of preliminary treatment earlier, compress the picture edge, carry out bending deformation to the image, through these preliminary deformation processing to the picture, just neutralize with the enlarged effect of convex lens camera lens, make final display effect more accurate, the effect that obtains is exactly the experience of complete immersion type.
After the user wears the head-mounted device 100, the intelligent control device 300 can provide a mode for the user to select to perform detection or health care, when the user selects the detection mode, the intelligent control device 300 sends the processed vision detection image to the image display device 101 and sends an instruction to the audio playing device 102 to guide the eyeball of the user to move, during the detection process, the intelligent control device 300 can also receive the offset motion state of the head position and the angle of the user, which is sent by the motion sensing device 103, so as to control the anti-dizziness device 400 to perform coordination, and after the detection is finished, the intelligent control device 300 also receives the detection feedback of the user on the vision detection image and sends the detection feedback to the remote terminal device 500.
As an alternative embodiment, the head-mounted device 100 further includes a sound collection device 104, which can receive the voice feedback of the user for the vision test image or the vision care image and transmit the voice feedback to the intelligent control device 300, and the intelligent control device 300 can transmit the voice feedback to the remote terminal device 500 in combination with the detection feedback of the vision test image by the user.
When people rotate the head in the real world, the picture in front of the eyes changes along with the visual angle, the picture in front is seen when the head is forward, the picture on the left is seen when the head is leftward, and the picture on the right is seen when the head is rightward, so that when a user rotates the head, the brain can complement a complete three-dimensional space image through the seen continuous pictures. However, when the user wears the head-mounted device 100 to view the image displayed by the image display device 101, the image frame cannot be displayed at a speed that matches the rotation or movement speed of the user when the user rotates the angle of view or moves his/her body, and such a delay may cause the user to feel a dizzy feeling.
In order to prevent the user from generating discomfort feeling of dizziness, the invention simulates the head movement of the user, particularly the head movement required in vision detection and eye fatigue recovery, establishes a random process by using a statistical model, and designs a head future position prediction unit based on filtering and measurement data preprocessing technology. Meanwhile, as shown in fig. 2, the anti-dizziness device 400 includes a rotation controller (not shown) having a head future position prediction unit built therein and an anti-dizziness swivel chair 402, wherein the anti-dizziness swivel chair 402 includes a swivel chair body 4021, a rotating base 4022 supported at the bottom of the swivel chair body 4021, and a rotating head rest 4023 provided at the top of the chair back of the swivel chair body 4021 for fixing the head of a user. Because the constituent pictures of the vision detection image or the vision health-care image in the invention generally have fixed time sequence relation, the angle change condition of the picture of the image to be played can be known in advance by fully utilizing the characteristic, according to the change situation of the image picture to be played, the head future position prediction unit built in the rotation controller pre-judges the rotation angle, then the rotation controller sends the rotation angle corresponding to the predicted future time to the anti-dizziness swivel chair 402, the rotating head bracket 4023 in the anti-dizziness swivel chair 402 rotates according to the rotation angle corresponding to the future time sent by the rotation controller, therefore, the image consistency in the head rotation range of the user is ensured, and meanwhile, the rotating base 4022 capable of rotating 360 degrees rotates according to the rotation angle corresponding to the future time sent by the rotation controller, so that the image consistency in the body rotation range of the user is ensured.
Since it is difficult to ensure that the body and head of the user are absolutely immobile, it is also necessary to adjust for deviations due to the movement of the user's body. An inertial sensor or an electromagnetic sensor is built in the rotary head support 4023, an inertial sensor and a gravity sensor are built in the rotary base 4022, and sensed motion parameters are sent to the rotary controller and fed back to the head future position prediction unit for correcting the algorithm by using the two sensors, so that a rotary-video synchronization algorithm correction system is formed.
After the vision detection is finished, the intelligent control device 300 receives the detection feedback of the user on the vision detection image and sends the detection feedback to the remote terminal device 500, and the remote terminal device 500 correspondingly starts the eyeball sensitivity improving module, the eye fatigue relieving training module, the lens fitting module or the ophthalmic disease control module according to the detection feedback sent by the intelligent control device to provide corresponding vision health care service for the user. For example, after measuring the vision condition of the user according to the definition of the visual objects or measuring the eye fatigue of the user through the response speed of the visual objects, the eye fatigue relief training module is started to play a vision care image on the image display device 101 for the user to watch, and the comprehensive eye fatigue recovery is achieved through the change guidance of light, brightness and depth of field, such as counteracting the vision defect of the user by using an analog focusing means and providing the retina hyperopic defocus, or moving the near focus to a far distance by using an automatic focusing means, pulling the sight line far, relieving the fatigue, or increasing the eye focusing sensitivity by using an automatic zooming means, or reducing the mixed myopia degree by using an automatic hyperopic atomizing means.
As an alternative implementation manner, the vision monitoring system further comprises an image processing device in communication connection with the intelligent control device, wherein the image processing device is used for receiving the vision detection image or the vision health image transmitted by the intelligent control device, performing split screen processing on the vision detection image or the vision health image, and then transmitting the vision detection image or the vision health image to the image display device.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention. And the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A vision training healthcare system with an anti-glare device, comprising: the system comprises a head-mounted device, an intelligent control device in communication connection with the head-mounted device, and an anti-dizziness device in communication connection with the intelligent control device; wherein,
the head-mounted equipment is used for displaying a vision detection image or a vision health-care image for a user and tracking the offset motion of the head position and the angle of the user so as to transmit the offset motion state of the head position and the angle of the user to the intelligent control equipment;
the intelligent control equipment is used for providing a mode for the user to select for detection or health care, sending the vision detection image or the vision health care image to the head-mounted equipment according to the mode selected by the user, and receiving the head position and angle offset motion state of the user transmitted by the head-mounted equipment so as to control the head-mounted equipment and the anti-dizziness equipment to coordinate;
the anti-dizziness device comprises a rotation controller which is arranged on the head-mounted device and is internally provided with a head future position prediction unit, wherein the rotation controller is used for calculating the corresponding rotation angle of the vision detection image or the vision health image to be displayed by the head future position prediction unit according to the change condition of the picture angle of the vision detection image or the vision health image to be played so as to keep synchronous with the offset motion state of the head position and the angle of the user.
2. A vision training health system having an anti-glare device according to claim 1, wherein the vision test image or the vision health image is set as an image having a fixed time-series relationship between the constituent frames to predetermine an angle change of the image frame to be played.
3. The system of claim 2, wherein the anti-glare apparatus further comprises an anti-glare swivel chair, the anti-glare swivel chair comprises a swivel chair body, a swivel base supported at the bottom of the swivel chair body, and a swivel head support disposed at the top of the chair back of the swivel chair body for fixing the head of the user, wherein the swivel base and the swivel head support are in communication with the swivel controller, and are configured to receive and swivel at the swivel angle corresponding to the vision detection image or the vision health image to be displayed calculated by the swivel controller, so that the body and head swivel ranges of the user are consistent with the swivel angle.
4. A vision training health system with anti-glare device according to claim 3, wherein the rotation range of the rotating base is 360 degrees.
5. A vision training and health care system with anti-glare device according to claim 4, wherein the rotating base is provided with inertial sensor and gravity sensor inside, and the rotating head holder is provided with inertial sensor or electromagnetic sensor inside.
6. A vision training healthcare system with anti-glare devices according to claim 5, wherein the sensors built into the rotating base and the rotating headpiece are configured to send sensed body motion parameters and head motion parameters to the rotation controller to correct the head future position prediction unit, respectively.
7. A vision training and healthcare system with an anti-glare device according to any one of claims 1 to 6, wherein the head-mounted device comprises:
an image display device for receiving the vision test image or the vision care image and displaying the vision test image or the vision care image to a user;
an audio playing device for playing a sound file synchronized with the vision test image or the vision care image displayed by the image display device;
the motion sensing device is used for tracking the offset motion of the head position and the head angle of the user and transmitting the offset motion state of the head position and the head angle of the user to the intelligent control equipment.
8. A vision training and health-care system with an anti-dizziness device as claimed in claim 7, further comprising an image processing device and a remote terminal device communicatively connected to said intelligent control device, wherein said image processing device is configured to receive said vision testing image or said vision health-care image transmitted by said intelligent control device, and transmit said vision testing image or said vision health-care image to said image display device after performing split screen processing; the remote terminal equipment comprises a plurality of intervention modules, and each remote terminal equipment is used for starting the corresponding intervention module according to the detection feedback of the intelligent control equipment to the vision detection image received by the user.
9. A vision training healthcare system with anti-glare device according to claim 8, wherein the motion sensing means is at least one or a combination of two or more of the following types of sensors: a mechanical sensor, an electromagnetic sensor, an optical sensor, an ultrasonic sensor, an inertial sensor, or a gravity sensor.
10. A vision training and healthcare system with an anti-glare device according to claim 8, wherein the head-mounted device further comprises a sound collection device for receiving voice feedback of the user on the vision test image or the vision healthcare image and transmitting the voice feedback to the smart control device.
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| CN110007475A (en) * | 2019-04-17 | 2019-07-12 | 万维云视（上海）数码科技有限公司 | Utilize the method and apparatus of virtual depth compensation eyesight |
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| CN113212437A (en) * | 2021-05-21 | 2021-08-06 | 吉林大学 | Motion sickness estimation method during vehicle curve running |
| CN113257387A (en) * | 2021-06-07 | 2021-08-13 | 宁波圻亿科技有限公司 | Wearable device for rehabilitation training, rehabilitation training method and system |
| CN116458835A (en) * | 2023-04-27 | 2023-07-21 | 上海中医药大学 | A detection and prevention system for myopia and amblyopia in young children |
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