CN110652281B - Visual field meter and visual field detection method based on virtual reality technology - Google Patents
Visual field meter and visual field detection method based on virtual reality technology Download PDFInfo
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- CN110652281B CN110652281B CN201911022240.0A CN201911022240A CN110652281B CN 110652281 B CN110652281 B CN 110652281B CN 201911022240 A CN201911022240 A CN 201911022240A CN 110652281 B CN110652281 B CN 110652281B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
- A61B3/024—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for determining the visual field, e.g. perimeter types
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/0016—Operational features thereof
- A61B3/0041—Operational features thereof characterised by display arrangements
- A61B3/0058—Operational features thereof characterised by display arrangements for multiple images
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/14—Arrangements specially adapted for eye photography
Abstract
The invention relates to a perimeter based on a virtual reality technology and a perimeter detection method, belongs to the technical field of perimeter detection, and solves the problems that the existing perimeter is not portable, high in cost, low in accuracy and the like. The perimeter includes: the visual field inspection glasses are used for displaying a virtual three-dimensional scene image sequence simulating optical stimulation and also used for acquiring an eye image of a subject in real time; the subject triggering device is used for sending a triggering signal to the processing device after the subject feels the simulated optical stimulation displayed in the visual field examination glasses; the processing device is used for receiving and analyzing whether the eye images of the subject meet the fixation condition or not, and if so, sending the image sequence to the visual field inspection glasses; the image acquisition device is also used for receiving the trigger signal and recording an image sequence frame corresponding to the trigger signal; and the system is also used for processing the trigger signal and the image sequence frame corresponding to the trigger signal to obtain a visual field inspection result. The perimeter has the advantages of good portability, low cost and high precision.
Description
Technical Field
The invention relates to the technical field of visual field detection, in particular to a visual field meter and a visual field detection method based on a virtual reality technology.
Background
A conventional perimeter (as shown in fig. 1) generally includes an optical stimulus generating device 11, a subject triggering device 12, an integrated control and analysis processing device 13, and the like. The optical stimulation generating device is mainly of a bin structure with a window, the inner wall of a bin chamber is used as a background screen, optical stimulation is sent to a subject through a fixed position stimulation point or a projection stimulation point, the inner wall of the bin chamber is provided with a central point and a camera for fixed vision monitoring, and a chin support and a forehead support are arranged at the windowing position of the bin chamber, so that the head position of the subject is kept unchanged in the detection process; a subject triggering device, which generally adopts a button triggering mode and sends a specified triggering signal to the integrated control and analysis processing device every time a subject presses the device; the integrated control and information processing device mainly realizes the control of the optical stimulation generating device, including fixation monitoring, integral planning and control of the brightness, lighting time and lighting sequence of the stimulation points, and the like.
At present, most of mechanisms adopt the automatic perimeter to carry out visual field examination, and the left eye and the right eye are separately and independently carried out. Before examination, the examinee needs to properly adjust the relative height between the examinee and the equipment, and the head is close to the chin rest and the forehead rest and shields one eye, and at the moment, a background screen is arranged right in front of the examinee and can send optical stimulation to the examinee through fixed position stimulation points or projection stimulation points. During examination, the examined eye of the examinee needs to keep the center point of the inner wall of the visual chamber fixed all the time, a stimulating light spot with specific stimulation intensity appears at a certain point in the background screen at regular intervals, if the examinee sees the light spot, the trigger device is pressed down until the visual field sensitivity in all the visual field ranges is examined, the eye visual field examination is finished, the other eye is examined according to the same flow, after the examination is finished, the integrated control and analysis processing device analyzes and processes the trigger information of the examinee to obtain a visual field examination result, and the visual field examination is finished.
Although such an automatic perimeter has been widely used clinically and has achieved a good diagnostic effect, it still has the following problems:
1) The equipment occupies a large space, is heavy in weight, has no portability and is not suitable for the application situation of the fluidity screening;
2) The hardware cost and the maintenance requirement of the equipment are high, the equipment has high requirements on operators and inspection environments, the equipment needs to be carried out in a quiet darkroom under the guidance of a specially-assigned person, and the equipment is difficult to popularize and use in small medical institutions, particularly remote areas;
3) The device can only realize a one-to-one examination form, namely one device can only carry out visual field examination on one subject at the same time, and the time consumption of the visual field examination is about 15 to 20 minutes, so that the one-to-one examination form is low in efficiency and long in queuing time;
4) In the process of checking, a subject is difficult to keep the head pose strictly still, so that the fixation condition is broken in the test process, the position of the chin rest needs to be adjusted again until the fixation condition is met again, the checking can be continued, and the whole detection process is seriously influenced, and even the accuracy is seriously influenced.
Disclosure of Invention
In view of the foregoing analysis, the present invention provides a perimeter meter and a perimeter detection method based on virtual reality technology, so as to solve the problems of the existing perimeter meter, such as no portability, high cost, and low accuracy.
The purpose of the invention is mainly realized by the following technical scheme:
a virtual reality technology-based perimeter, the perimeter comprising:
the visual field examination glasses are used for displaying a virtual three-dimensional scene image sequence simulating optical stimulation and acquiring an eye image of a subject in real time;
the subject triggering device is used for sending a triggering signal to the processing device after the subject feels the simulated optical stimulation displayed in the visual field inspection glasses;
the processing device is used for receiving and analyzing whether the eye images of the subject meet a fixation condition or not, and if so, sending the image sequence to the visual field inspection glasses; the image acquisition device is also used for receiving the trigger signal and recording an image sequence frame corresponding to the trigger signal; and the system is also used for processing the trigger signal and the image sequence frame corresponding to the trigger signal to obtain a visual field inspection result.
On the basis of the scheme, the invention is further improved as follows:
further, the perimetrical spectacles comprise:
the display module is divided into a left display module and a right display module and is used for respectively displaying corresponding image sequences;
the sensor module consists of a series of infrared cameras and infrared LEDs which are respectively arranged along the peripheries of the left display module and the right display module, the infrared LEDs irradiate infrared light to the cornea of the human eye, the infrared light forms a purkinje spot on the cornea of the human eye, and the eye image of a subject containing the purkinje spot is obtained through the infrared cameras;
the control processing module is used for receiving and controlling the display module to display the image sequence; and is further configured to send the subject eye image to the processing device.
Further, the processing device analyzes the subject eye image to determine whether a fixation condition is satisfied by performing:
calculating in real time according to a corneal pupil reflection method and bright pupil and dark pupil principles to obtain the eyeball watching direction in the eye image;
calculating a position point of the eyeball in the three-dimensional scene image according to the eyeball watching direction;
calculating the position deviation of a position point in the eyeball staring three-dimensional scene image and an image fixation central point;
if the deviation is smaller than or equal to the set threshold value, the fixation condition is met, and the position point of the eyeball in the image of the three-dimensional scene watched by the eyeball and the fixation central point of the image are kept consistent by performing coordinate conversion and synchronous rendering on the virtual three-dimensional scene according to the deviation.
Further, if the deviation is greater than a set threshold, the fixation condition is not satisfied, and the processing device suspends sending the image sequence; and simultaneously, sending a control instruction to a control processing module of the visual field examination glasses, controlling the visual field examination glasses to send a prompt tone to prompt the examinee to reduce the eye movement, and automatically continuing the examination after the fixation condition is met again.
Furthermore, the perimeter also comprises a multi-interface integrated module, which is used for accessing a corresponding number of the perimeter examination glasses and the subject triggering devices according to the number of the subjects, and is also used for being connected with the processing device to realize the information interaction between the plurality of groups of the perimeter examination glasses, the subject triggering devices and the processing device.
Further, the image sequence is pre-manufactured and stored in the processing device, and is used for simulating the background of the inner wall of the optical stimulation generating device, and simulating the optical stimulation by adjusting the brightness and the lighting time of part of pixel points in the virtual three-dimensional scene according to a certain sequence.
Further, the processing device controls the image sequence to be displayed only in the display module corresponding to one side of the detected eye, and the display module on the other side is always kept in a black screen state.
Furthermore, the visual field inspection glasses further comprise a shell, wherein the shell is used for enveloping the display module, the sensor module and the control processing module, is internally provided with earmuffs and is used for isolating external environment sounds and sending sound prompts to a subject, and the shell is provided with a wearing component so as to be convenient for the subject to wear.
The invention also provides a visual field detection method based on the virtual reality technology, which is realized by utilizing the perimeter; the method comprises the following steps:
the subject wears the visual field examination glasses and holds the trigger device by hand, so that the reliable connection of the visual field examination glasses, the subject trigger device and the processing device is ensured; when a plurality of subjects simultaneously carry out visual field examination, the reliable connection of the visual field examination glasses, the subject triggering device, the multi-interface integrated module and the processing device is ensured;
after the perimeter is powered on, the visual field inspection glasses automatically acquire the eye images of the testee, the processing device receives and analyzes whether the eye images of the testee meet the fixation condition, if so, a prompt tone is sent to the visual field inspection glasses to prompt the testee to start inspection, and a virtual three-dimensional scene image sequence simulating optical stimulation is sent to the visual field inspection glasses; the image sequence is only displayed on the display module corresponding to one side of the detected eye, and the display module on the other side is always kept in a black screen state;
after the testee feels the stimulus, the testee presses the trigger device of the testee to send out a trigger signal; the processing device receives a trigger signal sent by the subject trigger device, and records an image sequence frame corresponding to the trigger signal;
after the image sequence is played, detecting the other eye in the same way;
and after the examination of both eyes is finished, the processing device respectively processes the position, intensity and duration information of the analog optical stimulation in all the image sequence frames which are recorded correspondingly to each eye and correspond to the trigger signal, so as to obtain a visual field examination result and generate a visual field examination report.
On the basis of the scheme, the invention is also improved as follows:
and in the detection process, detecting whether the eye image of the subject meets the fixation condition in real time in the whole process, if not, sending a sound by the sight examination glasses to prompt the subject to reduce the eye movement, and suspending the current detection process until the fixation condition is met again, and then automatically continuing the examination.
The invention has the following beneficial effects:
the perimeter based on the virtual reality technology provided by the invention has the following beneficial effects:
1. the mobile phone has the advantages of small volume, light weight and good portability, does not need the advantages of a darkroom (because the worn visual field examination glasses cover eyes and ears of people, the effect of isolating external light and sound is achieved, the requirement on the examination environment is not high before, namely, the examination is not required to be carried out in the quiet darkroom any more), and is particularly suitable for the application situation of mobility screening;
2. the patient position is not limited, the device is also suitable for patients who are bedridden, limited in position and incapable of sitting for a long time, and the comfort and the safety of the examination are improved to a certain extent.
3. The hardware is low in cost, light and portable, and can be sent to a centralized maintenance center for calibration and daily maintenance without the need of an engineer to go to the door one by one for maintenance, so that the overall cost of the automatic perimeter is reduced, and the automatic perimeter system is also favorable for popularization in small medical institutions, particularly remote areas;
4. the equipment has one-to-many inspection capability, namely one equipment (one integrated control and analysis device is connected with a plurality of visual field inspection glasses and a plurality of subject trigger devices) can simultaneously carry out visual field inspection on a plurality of subjects, so that the overall inspection efficiency is improved, the inspection queuing pressure is effectively relieved, the equipment utilization rate is improved, and the inspection cost is reduced; the number of people that can be checked is not only influenced by the number of visual field inspection glasses and subject triggering devices, but also is related to the computing power of the processing device, because each visual field detection process needs to start a process to independently realize all functions of three-dimensional modeling, image rendering, fixation monitoring, light stimulation point simulation, information receiving and sending, data storage, detection result analysis and the like, various resources of the processing device are greatly consumed, software and hardware resources are comprehensively considered, and the number of subjects receiving detection at the same time can be determined according to the actual situation on the premise that the processes run smoothly and do not interfere with each other.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic view of a perimeter of a prior art perimeter;
FIG. 2 is a schematic view of a virtual reality technology-based perimeter in an embodiment of the present invention;
FIG. 3 is a schematic view of an internal display module and a sensor module of the Vision inspection glasses according to an embodiment of the present invention;
fig. 4 is a flowchart of a visual field detection method based on a virtual reality technology in an embodiment of the present invention.
Reference numerals:
11-an optical stimulus generating device; 12-a subject triggering device; 13-integrated control and analysis processing means; 21-visual field examination glasses; 22-subject triggering means; 23-a multi-interface integration module; 24-a processing device; 211-a display module; 212-sensor module.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
The virtual technology is a new technology in recent years, is mainly applied to the fields of entertainment, education and the like, belongs to preliminary application in the medical field, mainly focuses on the aspect of virtual surgery, and is rarely applied to the aspect of medical examination. The optical stimulation generating device in the existing perimeter is realized by adopting a virtual reality technology, and the difficulties mainly comprise: (1) a real-time vision fixation monitoring technology; (2) simulating the real scene in the original optical stimulation generating device with high authenticity; (3) the optical stimulation effect of the original device is simulated. In order to solve the problems of the conventional common automatic perimeter and the problem that the effect of an optical stimulation generating device in the conventional perimeter cannot be realized by adopting a virtual reality technology in the prior art, the invention provides the perimeter based on the virtual reality technology, which is used for solving the problems.
Example 1
Embodiment 1 of the invention discloses a perimeter based on a virtual reality technology, and a schematic structural diagram is shown in fig. 2. The perimeter includes: the visual field examination glasses 21 are used for displaying a virtual three-dimensional scene image sequence simulating optical stimulation and acquiring an eye image of a subject in real time; a subject triggering device 22, configured to send a triggering signal to the processing device, for example, in a button triggering manner, after the subject experiences the simulated optical stimulation displayed in the visual field examination glasses; the processing device 24 is used for receiving and analyzing whether the eye images of the subject meet a fixation condition, and if so, sending the image sequence to the visual field inspection glasses; the image acquisition device is also used for receiving the trigger signal and recording an image sequence frame corresponding to the trigger signal; and the system is also used for processing the trigger signal and the image sequence frame corresponding to the trigger signal to obtain a visual field inspection result.
Compared with the prior art, the perimeter based on the virtual reality technology provided by the embodiment realizes the visual field detection function by means of the virtual three-dimensional scene image sequence simulating the optical stimulation, and is different from the existing mode of directly realizing the visual field detection by using the optical stimulation. Meanwhile, the perimeter in the embodiment can analyze whether the fixation condition is met or not by analyzing the eye image of the subject, and the chin position of the subject does not need to be specially fixed. Therefore, the posture of the patient is not required to be limited, the device is also suitable for the patient who is bedridden, has limited posture and cannot sit for a long time, and the comfort and the safety of the examination are improved to a certain extent. In addition, the perimeter is small in size, light in weight and good in portability, does not need the advantages of a dark room (because the worn perimeter inspection glasses cover the eyes and ears of a person, the effect of isolating external light and sound is achieved, the requirement on the inspection environment is not high before, namely the inspection is not required to be carried out in the quiet dark room), and is particularly suitable for the application situation of mobility screening; the perimeter can also save larger hardware cost, is light and portable, can be sent to a centralized maintenance center for calibration and routine maintenance without an engineer to maintain the perimeter one by one, thereby reducing the overall cost of the automatic perimeter, and being favorable for popularization in small medical institutions, particularly remote areas.
Preferably, the perimeter in this embodiment originally adopts a virtual reality technology, and the function of the perimeter optical stimulus generating device is implemented in the perimeter inspection glasses (as shown in fig. 3), that is, the virtual three-dimensional scene is used to simulate the background (including the fixation center point) on the inner wall of the optical stimulus generating device, and then the optical stimulus purpose is achieved by adjusting the brightness and lighting time of some pixel points in the virtual three-dimensional scene according to a certain sequence. Preferably, the vision inspection glasses include: the display module 211 is divided into a left display module and a right display module, and is used for respectively displaying corresponding image sequences; sensor modules 212 are arranged in the visual field inspection glasses along the peripheries of the left display module 211 and the right display module 211 respectively and used for tracking and analyzing eye ball movement. Preferably, the sensor module 212 is composed of a series of infrared cameras and infrared LEDs respectively arranged along the peripheries of the left and right display modules, the infrared LEDs irradiate infrared light to the cornea of the human eye, the infrared light forms a purkinje spot on the cornea of the human eye, and an eye image of the subject containing the purkinje spot is acquired through the infrared cameras; a control processing module (not shown in fig. 2) for receiving and controlling the display module to display the image sequence; further for sending the subject eye image to the processing device; the shell (not shown in figure 2) is used for enveloping the display module, the sensor module and the control processing module, is internally provided with an earmuff and is used for isolating external environment sound and sending out a sound prompt to a subject, and the shell is provided with a wearing component and is convenient for the subject to wear. The visual field inspection glasses provided by the embodiment are used for displaying an image sequence, and the acquisition of the eye images of the subject is realized through the sensor module. The judgment of the fixation condition is realized by processing the eye image of the subject at the later stage.
Preferably, the embodiment further provides a specific manner for the processing device to determine the fixation condition, and the following description is given:
calculating in real time according to a corneal pupil reflection method and bright pupil and dark pupil principles to obtain the eyeball watching direction in the eye image; calculating a position point of the eyeball in the three-dimensional scene image according to the eyeball watching direction; calculating the position deviation of a position point in the eyeball staring three-dimensional scene image and an image fixation central point;
if the deviation is less than or equal to the set threshold, the eyeball motion is small, the fixation condition is met, and the virtual three-dimensional scene is subjected to coordinate conversion and synchronous rendering according to the deviation, namely, for the micro motion of the eyeball, the position point in the image of the eyeball gazing three-dimensional scene is consistent with the image fixation central point through fine adjustment of the virtual three-dimensional scene, and the precision of the visual field detection result can be effectively improved; if the deviation is larger than a set threshold value, indicating that the eyeball movement is large, and not meeting the fixation condition, and the processing device suspends sending the image sequence in order to ensure the precision of the vision field detection result; and simultaneously, sending a control instruction to a control processing module of the visual field examination glasses, controlling the visual field examination eyes to send a prompt tone to prompt the examinee to reduce the eye movement, and automatically continuing the examination after the vision fixation condition is met again. Preferably, the present invention proves through a large number of experiments that the accuracy of the vision field detection result is better when the set threshold is set to be 1.5 mm.
Preferably, the perimeter further includes a multi-interface integrated module 23 as an additional extension module, which is mainly used in a scenario where one device performs visual field examination on multiple subjects at the same time, is used for accessing a corresponding number of visual field examination glasses and subject triggering devices according to the number of the subjects, and is further used for being connected to the processing device, so as to implement information interaction between multiple sets of visual field examination glasses, subject triggering devices, and the processing device. When only 1 visual field examination glasses and 1 subject trigger device are used, the two can be directly accessed into the processing device, and the multi-interface integrated module is not needed. The equipment has one-to-many inspection capability, namely one equipment (one integrated control and analysis device is connected with a plurality of visual field inspection glasses and a plurality of subject trigger devices) can simultaneously carry out visual field inspection on a plurality of subjects, so that the overall inspection efficiency is improved, the inspection queuing pressure is effectively relieved, the equipment utilization rate is improved, and the inspection cost is reduced; the number of the inspectable persons is not only influenced by the number of the visual field inspection glasses and the number of the subject triggering devices, but also related to the computing capability of the processing device, because each visual field detection process needs to start a process to independently realize all functions of three-dimensional modeling, image rendering, fixation monitoring, light stimulation point simulation, information receiving and sending, data storage, detection result analysis and the like, so that various resources of the processing device are greatly consumed, software and hardware resources are comprehensively considered, and the number of the subjects simultaneously subjected to detection can be determined according to actual conditions on the premise of ensuring that each process runs smoothly and does not interfere with each other.
Preferably, the hardware form of the processing device can be selected from a desktop computer or a notebook computer, and the computing processing capabilities of the desktop computer and the notebook computer are similar, and the hardware form of the processing device is mainly selected according to the specific requirement of portability. The main functions of the processing device are to directly or indirectly (via the multi-interface integrated module) send control information, virtual reality image information and the like to the visual field examination glasses, and directly or indirectly (via the multi-interface integrated module) receive eyeball movement information from the visual field examination glasses and trigger signals from the subject trigger device and the like, and perform analysis processing, such as fixation condition monitoring and adjustment, test result recording and analysis and the like, according to the information.
Example 2
In embodiment 2 of the present invention, a visual field detection method based on a virtual reality technology is provided, which is implemented by using the perimeter in embodiment 1; the flow chart is shown in fig. 4, and the method comprises the following steps:
step S1: the subject wears the visual field examination glasses and holds the trigger device by hand, so that the reliable connection of the visual field examination glasses, the subject trigger device and the processing device is ensured; when a plurality of subjects perform visual field examination simultaneously, the reliable connection of the visual field examination glasses, the subject trigger device, the multi-interface integrated module and the processing device is ensured;
step S2: after the perimeter is powered on, the visual field inspection glasses automatically acquire the eye images of the testee, the processing device receives and analyzes whether the eye images of the testee meet the fixation condition, if so, a prompt tone is sent to the visual field inspection glasses to prompt the testee to start inspection, and a virtual three-dimensional scene image sequence simulating optical stimulation is sent to the visual field inspection glasses; the image sequence is only displayed on the display module corresponding to one side of the detected eye, and the display module on the other side is always in a black screen state;
for effectively avoiding the visual field testing result deviation that equipment error caused, can increase the step that medical personnel confirmed: when the processing device detects that the fixed vision condition is met, the processing device prompts medical staff to confirm whether the visual field inspection condition is met again, and after the medical staff confirms, the processing device sends prompt tones to the visual field inspection glasses to prompt subjects to start inspection and carries out subsequent steps.
In the checking process, the integrated control and analysis processing device simulates an optical stimulation signal only in an image at one side of a checked eye on the basis of a virtual three-dimensional scene image according to a certain sequence by adjusting the brightness of partial pixel points and the lighting time, and a subject presses a trigger device to send out a trigger signal after feeling stimulation;
and step S3: in the examination process, after the testee feels the stimulation, the testee presses down the trigger device of the testee to send out a trigger signal; the processing device receives a trigger signal sent by the subject trigger device and records an image sequence frame corresponding to the trigger signal;
and step S4: after the image sequence is played, detecting the other eye in the same way;
step S5: and after the examination of both eyes is finished, the processing device respectively processes the position, intensity and duration information of the analog optical stimulation in one or more image sequence frames which are correspondingly recorded by each eye and correspond to the trigger signal, so as to obtain a visual field examination result and generate a visual field examination report.
Preferably, in order to ensure the accuracy of the detection result, the fixation condition is required to be satisfied in the whole inspection process. Therefore, in the detection process, whether the eye image of the subject meets the fixation condition or not is detected in real time in the whole process, if not, the visual field detection glasses give out a sound to prompt the subject to reduce the eye movement, the current detection process is suspended until the fixation condition is met again, and the detection is automatically continued until the detection is finished.
The method and the device are realized based on the same principle, can be used for reference, and can achieve the same technical effect.
Those skilled in the art will appreciate that all or part of the processes for implementing the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, for instructing the relevant hardware. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (5)
1. A perimeter based on virtual reality technology, the perimeter comprising:
the visual field inspection glasses are used for displaying a virtual three-dimensional scene image sequence simulating optical stimulation and also used for acquiring an eye image of a subject in real time; the image sequence is pre-manufactured and stored in the processing device, is used for simulating the inner wall background of the optical stimulus generating device including the fixation center point, and simulates optical stimulus by adjusting the brightness and the lighting time of part of pixel points in the virtual three-dimensional scene according to a certain sequence;
the subject triggering device is used for sending a triggering signal to the processing device after the subject feels the simulated optical stimulation displayed in the visual field inspection glasses;
the processing device is used for receiving and analyzing whether the eye images of the subject meet a fixation condition or not, and if so, sending the image sequence to the visual field inspection glasses; the image acquisition device is also used for receiving the trigger signal and recording an image sequence frame corresponding to the trigger signal; the system is also used for processing the trigger signals and the position, intensity and duration information of the analog optical stimulation in the image sequence frame corresponding to the trigger signals to obtain a visual field inspection result and generate a visual field inspection report;
the processing device analyzes the subject eye image to determine whether a fixation condition is satisfied by performing the following operations:
calculating in real time according to a corneal pupil reflection method and bright pupil and dark pupil principles to obtain the eye watching direction in the eye image;
calculating a position point of the eyeball in the three-dimensional scene image according to the eyeball watching direction;
calculating the position deviation of a position point in the eyeball staring three-dimensional scene image and an image fixation central point;
if the deviation is less than or equal to a set threshold value, a fixation condition is met, and the position point of the eyeball in the three-dimensional scene image is consistent with the image fixation central point by performing coordinate conversion and synchronous rendering on the virtual three-dimensional scene according to the deviation;
if the deviation is greater than a set threshold value, the fixation condition is not met, and the processing device suspends sending the image sequence; meanwhile, a control instruction is sent to a control processing module of the visual field inspection glasses, the visual field inspection glasses are controlled to send out a prompt tone to prompt a subject to reduce eye movement, and the inspection is automatically continued after the vision fixation condition is met again;
the vision field inspection glasses include:
the display module is divided into a left display module and a right display module and is used for respectively displaying corresponding image sequences;
the sensor module consists of a series of infrared cameras and infrared LEDs which are respectively arranged along the peripheries of the left display module and the right display module, the infrared LEDs irradiate infrared light to the cornea of the human eye, the infrared light forms a purkinje spot on the cornea of the human eye, and the eye image of a subject containing the purkinje spot is obtained through the infrared cameras;
the control processing module is used for receiving and controlling the display module to display the image sequence; further for sending the subject eye image to the processing device;
the perimeter also comprises a multi-interface integrated module which is used for accessing a corresponding number of the visual field examination glasses and the subject trigger devices according to the number of the subjects and is also used for being connected with the processing device to realize the information interaction between the plurality of groups of the visual field examination glasses, the subject trigger devices and the processing device.
2. A perimeter based on virtual reality technology according to claim 1, wherein said processing means controls said image sequence to be displayed only on the display module corresponding to one side of the detected eye, and the display module on the other side is always kept in a black screen state.
3. Perimeter based on virtual reality technology, according to claim 1,
the visual field inspection glasses further comprise a shell, the shell is used for enveloping the display module, the sensor module and the control processing module, an earmuff is arranged in the shell and used for isolating external environment sound and sending a sound prompt to a subject, and the shell is provided with a wearing assembly which is convenient for the subject to wear.
4. A visual field detection method based on a virtual reality technology, which is characterized by being realized by the visual field meter of any one of claims 1-3; the method comprises the following steps:
the subject wears the visual field examination glasses and holds the trigger device by hand, so that the reliable connection of the visual field examination glasses, the subject trigger device and the processing device is ensured; when a plurality of subjects perform visual field examination simultaneously, the reliable connection of the visual field examination glasses, the subject trigger device, the multi-interface integrated module and the processing device is ensured;
after the perimeter is powered on, the visual field inspection glasses automatically acquire the eye images of the testee, the processing device receives and analyzes whether the eye images of the testee meet the fixation condition, if so, a prompt tone is sent to the visual field inspection glasses to prompt the testee to start inspection, and a virtual three-dimensional scene image sequence simulating optical stimulation is sent to the visual field inspection glasses; the image sequence is only displayed on the display module corresponding to one side of the detected eye, and the display module on the other side is always kept in a black screen state;
after the testee feels the stimulus, the testee presses the trigger device of the testee and sends out a trigger signal; the processing device receives a trigger signal sent by the subject trigger device and records an image sequence frame corresponding to the trigger signal;
after the image sequence is played, detecting the other eye according to the same mode;
and after the examination of both eyes is finished, the processing device respectively processes the position, the intensity and the duration information of the analog optical stimulation in all the image sequence frames which are recorded correspondingly to each eye and correspond to the trigger signal, so as to obtain a visual field examination result and generate a visual field examination report.
5. The visual field detection method based on the virtual reality technology as claimed in claim 4, wherein in the detection process, the whole course detects whether the eye image of the subject meets the fixation condition in real time, if not, the visual field detection glasses make a sound to prompt the subject to reduce the eye movement, and the current detection process is suspended until the fixation condition is met again, and then the detection is automatically continued.
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| CN1810202A (en) * | 2004-12-21 | 2006-08-02 | 佳能株式会社 | Ophthalmic apparatus |
| CN101133943A (en) * | 2006-08-29 | 2008-03-05 | 株式会社拓普康 | Eye movement measuring apparatus, eye movement measuring method and recording medium |
| CN109846456A (en) * | 2019-03-06 | 2019-06-07 | 西安爱特眼动信息科技有限公司 | It is a kind of based on wear display equipment perimetry device |
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