35 results about "Visual acuity chart" patented technology

A method and device for correcting visual acuity by means of a VR display device for VR experience. A varifocal liquid crystal lens (03) is added to a VR display device, an electronic visual acuity chart is displayed on a display screen (02), a zoom instruction is sent on a VR display interface to generate a picture corresponding to a focal length, and the picture is sent by means of a video interface to control the varifocal liquid crystal lens (03) to change the diopter, so as to match the visual acuity value of a wearer, so that a clear VR picture can be viewed. Thus, the same VR display device can be used by users having different visual acuity values.

The utility model discloses a space visual chart which comprises n + 1 character faces, the n + 1 character faces stand on the surface and are perpendicular to the horizontal plane, the n + 1 character faces are parallel to one another, each character face is provided with at least one sighting mark, when a plurality of sighting marks are formed on each character face, the lengths of all the sighting marks on the character face are the same in the vertical direction, and the number of the sighting marks on the character face is larger than one. M vision detection lines parallel to the character surfaces are formed on the surface, the n + 1 character surfaces are located on one side of the M vision detection lines, the sighting mark 1 faces the M vision detection lines, the distances between the n + 1 character surfaces and the same vision detection line are different, and the sighting mark between each vision detection line and all the character surfaces of a testee is not shielded by sight. And the visual sizes of the visual marks on the (n + 1) character surfaces from near to far by a tester are gradually reduced. A person moves back and forth to watch the spatial visual chart, so that the vision test of the visual performance of the three-dimensional spatial environment is realized.

The invention belongs to the technical field of visual inspection, and particularly relates to a visual function inspection device for oblique amblyopia patients, a second motor is arranged, when the second motor is started, an output shaft of the second motor drives a second rotating shaft and a second gear of a 120-degree special-shaped structure to rotate, and the second gear is meshed with a third gear on the outer side of an optical filter rotating disc; the optical filter is formed by combining a red optical filter, a green optical filter and a transparent optical filter, a second rotating shaft drives another optical filter turntable to synchronously rotate through synchronous transmission of a chain wheel, and a second gear rotates by a circle to just drive the optical filter turntable to switch one mode, so that the switching of the red optical filter, the green optical filter and the transparent optical filter can be accurately realized, and at the moment, one eye of a patient is close to a detection opening; the sighting marks on the detection plate are observed through the observation holes, and detection of functions related to monocular vision, color vision and refraction is completed by combining conversion of modes of the three optical filters and recognition conditions of a patient on a visual chart and the color vision sighting marks.

The utility model discloses an electronic visual acuity examination chart, which belongs to the technical field of visual acuity examination, and solves the problems that the existing device is inconvenient to update the opening position of a letter E on a visual acuity chart, a detected person is easy to recite the content of the visual acuity chart in advance, and the detection result is inaccurate. The letter updating device comprises a mounting frame, a letter updating assembly is arranged in the mounting frame, a supporting assembly is arranged at the bottom of the mounting frame, the letter updating assembly comprises updating rollers, a motor, a switch button and gears, the gears are driven by the motor to rotate, and all the updating rollers can be driven by the motor to periodically rotate through meshing of the adjacent gears. By arranging the observation windows on the rotating rollers, the lamp boxes on the different faces of the rotating rollers can be aligned with the observation windows respectively, then a detected person observes the orientation of letters E on the lamp boxes through the observation windows, the purpose of periodically replacing the lamp boxes appearing in the observation windows is achieved, and the problem that a detection result is inaccurate due to the fact that the detected person recits a visual chart in advance is solved.

According to the technical scheme, the visual chart is characterized in that the visual chart comprises a chart body base material and a vision detection graph arranged on the chart body base material, and the chart body base material is provided with a detection graph area corresponding to the vision detection graph and a blank graph area located on the periphery of the vision detection graph; a reflective coating is arranged on the detection pattern area and / or the blank pattern area, and when the reflective coating is arranged on the detection pattern area, a non-reflective color filling layer is arranged on the blank pattern area; when a reflective coating is arranged on the blank image area, a non-reflective color filling layer is arranged on the detection image area; when the detection pattern area and the blank pattern area are both provided with the reflective coatings, the detection pattern area is provided with a non-reflective color filling layer. In this way, when the visual chart is used in a dark environment, a user only needs to hold the light source by hand to illuminate the visual chart, vision detection can be conveniently conducted by the user through the light reflecting effect of the light reflecting coating, the use scene is not limited by a power source any more, and the use flexibility and the application range of the visual chart are greatly improved.

1. The name of the design product: the base of the projector for visual acuity test. 2. The use of the design product: the base of the projector for visual acuity test. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view 1.

The invention provides an intelligent portable dynamic screen projection multi-mode visual chart detection system and method, and the method comprises the steps: generating a target frame which can be dynamically configured based on an electronic device, and selecting a target visual chart region from the display information of the electronic device according to the target frame; randomly generating sighting marks in the target visual chart area, projecting the sighting marks in the target visual chart area to a display terminal, and regulating and controlling the distance between the user and the display terminal according to the detection requirement and the detection standard; after regulation and control are completed, pupil tracking and ambient light data collection are carried out in real time; receiving and analyzing pupil tracking results and ambient light data in real time, and optimizing visual chart parameters in real time according to analysis results; and when visual chart detection is carried out, carrying out multi-modal interaction with the electronic equipment according to user requirements. The flexibility of visual chart detection is effectively improved, the influence of environment and individual differences on a detection result is reduced, and the detection accuracy is improved; the detection process is more convenient through the multi-mode interaction mode, and the user experience is improved.

The application discloses a lifting linkage assembly for a visual acuity chart projector and relates to the technical field of visual acuity chart projectors.The lifting linkage assembly comprises a lifting device and a projection device, a supporting plate is arranged below the projection device, a lifting end of the lifting device is slidably connected with a lifting plate, the left side surface of the lifting plate is fixedly connected with the right side surface of the supporting plate, two positioning plates are fixedly installed on the upper surface of the supporting plate, the left side surface of each positioning plate is in contact with the right side surface of the projection device, a sliding groove is formed in the left side surface of each positioning plate, a sliding block is slidably connected with the inner wall of each sliding groove, the horizontal section of the sliding block and the sliding groove is in the shape of a Chinese character 'kong', and the left side surface of each sliding block is fixedly connected with the right side surface of the projection device.The application does not need to use connecting bolts to install and fix the visual acuity chart projector, greatly increases the dismounting convenience of the visual acuity chart projector, and facilitates the maintenance work of the visual acuity chart projector by the staff.

1. Name of the Design Product: Round Anti-Memory Standard Logarithmic Visual Acuity Chart. 2. Use of the Design Product: This design product is used for visual training screening. 3. Design Key Points of the Design Product: It lies in the combination of the shape and the pattern. 4. Picture or Photograph Most Indicating the Design Key Points: The front view of Design 1. 5. This design product is a flat product, and the left and right pitching views of each design are omitted; the rear views of Designs 2-10 are the same as the rear view of Design 1, so the rear views of Designs 2-10 are omitted. 6. Design 1 is designated as the basic design.

The present invention belongs to the technical field of ophthalmic examination auxiliary equipment, and in particular relates to an examination auxiliary equipment for ophthalmic treatment, including an installation box and a light-transmitting plate. The light-transmitting plate is installed inside the installation box. A plurality of LED lamp beads are fixedly connected to the rear inner wall of the installation box. A plurality of installation grooves are formed in the front side wall of the light-transmitting plate, and a visual acuity chart plate is provided in each of the plurality of installation grooves. A PLC controller is fixedly connected to the left side wall of the installation box, and a display screen is provided on the front side wall of the light-transmitting plate. When the present invention is used to assist in examining the visual acuity of a patient with a visual acuity chart, it can automatically guide the corresponding visual target on the visual acuity chart to test the patient's visual acuity, and display the patient's visual acuity through the display screen, without the need for medical staff to stand and serve for a long time. While reducing the workload of medical staff, it also avoids the problem of affecting the accuracy and reliability of the examination results due to inspection errors caused by fatigue.

The utility model belongs to the technical field of visual function training, and particularly discloses a myopia visual function checking and training device which comprises a lamp box and a box body, the box body is located in the lamp box, a visual chart board is arranged on one side of the box body, extending assemblies are arranged in the box body and on the two sides of the box body, and an adjusting assembly is arranged in the lamp box. The extension assembly comprises extension plates, extension tables are arranged on one sides of the two extension plates, the training screen can be expanded through the extension assembly, more sighting marks of different specifications can be displayed after the screen is expanded, the interval between the sighting marks can be adjusted more flexibly, and therefore the eyes can be trained in a richer visual stimulation environment, and the training effect is better. The lamp box is simple in structure and convenient to use, the training effect of improving the visual sensitivity is facilitated, binocular visual function training can be carried out, different visual stimuli often need to be presented to the eyes at the same time in the binocular visual function training, and the extended lamp box screen can better display complex binocular sighting marks such as stereoscopic sighting marks and fusion sighting marks.

The utility model relates to a vision screening device for ophthalmology department, which comprises a visual chart lamp box, which comprises a box body, a backlight plate and a visual chart, the top of the box body is open, the visual chart is clamped on the end face of the open end of the box body, and a plurality of rows of test marks are arranged on the visual chart; the backlight plate is fixed in the box body and is arranged on the back surface of the visual chart; an infrared transmitting device is arranged on the left side of the visual chart, an infrared receiving device is arranged on the right side of the visual chart, the infrared transmitting device and the infrared receiving device are both connected with a controller, and the controller is connected with a wireless transmission module; the controller is used for obtaining a test degree corresponding to a blocking position when it is determined that infrared rays are blocked and sending the test degree to the wireless transmission module, and the wireless transmission module is used for sending the test degree to the electronic equipment when receiving a confirmation instruction. The vision screening device for the ophthalmology department is low in manufacturing cost, and time and labor are saved when the vision screening device is used for vision screening.

The present invention discloses a method for testing vision based on a spatial vision chart. The spatial vision chart includes: n+1 character surfaces, the n+1 character surfaces standing upright on a surface and perpendicular to a horizontal plane, the n+1 character surfaces being parallel to each other, at least one optotype being provided on each character surface, and when multiple optotypes are formed on each character surface, all optotypes on the character surface have the same vertical length, M vision detection lines parallel to the character surfaces are formed on the surface, the n+1 character surfaces are located on one side of the M vision detection lines, and optotype 1 faces the M vision detection lines, the n+1 character surfaces are at different distances from the same vision detection line, and the tester has no visual obstruction between each vision detection line and the optotypes on all character surfaces, and the tester's visual size of the optotypes on the n+1 character surfaces gradually decreases from near to far. By moving a person forward and backward to view the spatial vision chart, a vision test of the visual representation of a three-dimensional spatial environment is achieved.

Embodiments of the present application relate to the technical field of image data processing, specifically to an optical imaging data analysis method and system based on artificial intelligence. An image analysis idea based on a liquid crystal imaging wavelet descriptor is proposed. By constructing a professional liquid crystal imaging pattern example set and using the wavelet descriptor for refined feature extraction, the embodiments of the present application aim to improve the accuracy and efficiency of liquid crystal visual acuity chart quality inspection. At the same time, through an innovative algorithm debugging strategy, the embodiments of the present application further improve the intelligent level of the automated quality inspection system, providing strong technical support for the technological progress and industrial upgrading of the liquid crystal display industry.

The invention discloses a vision detection device and a vision detection method. The vision detection device comprises a visual chart with a plurality of sighting target pages; the plurality of sighting mark pages comprise a diagnosis page and a plurality of examination pages, the diagnosis page is adjacent to the examination page with the minimum height of the sighting mark in the plurality of examination pages, the maximum height of the sighting mark in the diagnosis page is smaller than the minimum height of the sighting mark in the examination pages, and the number of sighting mark lines in the diagnosis page is larger than that of the sighting mark lines in each examination page; any two examination pages comprise a first sighting mark page and a second sighting mark page, the maximum height of sighting marks in the first sighting mark page is smaller than the minimum height of the sighting marks in the second sighting mark page, and the vision detection device can be used for vision general survey, accurate screening of low-vision people and vision detection of known low-vision people. The purposes of self-examination, screening, precise examination of clinical institutions and the like are achieved; in addition, the visual acuity tester can be suitable for far and near visual acuity charts, the sighting mark height and the line spacing in the visual acuity charts are changed at the same increasing rate, extremely low visual acuity examination can be carried out, and the application range is wide.

The application discloses a kind of based on mobile terminal's eye visual parameter adaptation guide method and system, the method includes: obtaining user basic information;Based on log visual acuity table is combined with mobile terminal screen pixel density and observation distance to construct visual target test table, according to the user basic information is combined with visual target test table, and visual target serial number is matched for user;According to the visual target serial number, calculate visual target line sequence change value, based on the preset multi-grade threshold interval is matched to the visual target line sequence change value, and parameter classification adaptation result is generated;Based on the parameter classification adaptation result is recommended personalized eye relief adjustment scheme for user.The method and system provided by the application can realize long-term, convenient and personalized visual parameter adaptation guide.

The invention provides an intelligent glasses control method and system, and the method comprises the steps: enabling an infrared transmitter installed on glasses to emit infrared light to a curtain, and enabling a controller installed on the glasses to judge the distance between the glasses and the curtain; if the distance meets a preset standard, a photographing device of the curtain collects a sitting posture image of the wearer, the photographing device judges that the sitting posture image is qualified, and a voice instruction for starting inspection is sent to a controller after the sitting posture image is qualified; the controller of the glasses receives a voice instruction and controls the instruction transmitter to specify a certain character in a vision examination table to start vision examination, and the projector projects the character to the curtain according to a character instruction sent by the instruction transmitter. The system comprises glasses, the controller, an infrared transmitter, an infrared receiver, a curtain, camera equipment, a brightness adjusting module, an instruction transmitter, a microphone, an eye movement tracker and a projector. The accuracy of vision examination results is guaranteed, and automation of vision examination is achieved.

1. The name of the design product: vision test graphical user interface of electronic equipment. 2. The use of the design product: for an electronic device. 3. The design points of the design product: in the graphical user interface. 4. The picture or photo that best indicates the design points: front view. 5. The use of the graphical user interface: for vision test. 6. The change state description of the graphical user interface: click "vision test" in the front view to enter change state figure 1; click "E letter visual acuity chart" in change state figure 1 to enter change state figure 2. 7. Other circumstances that need to be explained: X is the text content; the coated content is the content picture.

The invention belongs to the technical field of visual training, and discloses a method for matching visual training diopter switching frequency, which comprises the following steps of: 1, acquiring at least one first feedback signal of a user for identifying a first visual chart at a first diopter; and a second step of switching the first diopter to the second diopter and switching the first visual chart to the second visual chart in response to matching of the first feedback signal and the first visual chart. And 3, acquiring at least one second feedback signal of the second visual chart identified by the user at the second diopter. And a fourth step of switching the second diopter to the first diopter and switching the second visual chart to the third visual chart in response to matching of the second feedback signal and the second visual chart. A fifth step of repeating the first step to the fourth step until a preset time length; and step 6, counting the number of times of diopter switching and the number of times of signal feedback within a preset time, and outputting a diopter switching frequency. According to the invention, personalized diopter switching frequency can be provided.

This application discloses a method, device, medium, and product for displaying visual acuity test targets based on a smart device, relating to the field of visual acuity testing. The method includes acquiring the screen pixel density value of the terminal device; determining the display pixel height of the letter "E" at each visual acuity level based on the screen pixel density value, the test distance corresponding to the test mode, and a preset visual acuity level chart; and dynamically rendering graphic targets on the screen of the terminal device according to the display pixel height of the letter "E" at each level. This application can accurately display graphic sizes consistent with standard visual acuity charts on the terminal device, thereby improving the accuracy of visual acuity testing.

The liquid crystal visual chart with the rotatable screen comprises a balance weight bottom plate, a plurality of installation frames are fixedly connected to the corners of the top face of the balance weight bottom plate, a plurality of limiting holes are formed in the corners of the side faces of the installation frames, installation rods are hinged to the inner sides of the installation frames, and limiting assemblies are arranged on the left side face and the right side face of each installation rod. Universal wheels are fixedly connected to the ends, away from the mounting frame, of the bottom faces of the mounting rods, a mounting box is fixedly connected to the middle of the top face of the balance weight bottom plate, a rotating assembly is arranged in the mounting box and connected with a connecting rod, and a rotating support is fixedly connected to the top end of the front side face of the connecting rod; the front side face of the rotating support is fixedly connected with a liquid crystal visual chart. When the device is used, the whole device is convenient to move, the mounting rod is upwards rotated to be in a vertical state, the limiting assembly limits the mounting rod, the counterweight bottom plate makes contact with the ground, the contact area is increased, and stability is improved.

The invention discloses a self-service vision testing method and system based on infrared distance measurement and gesture recognition. The method comprises the steps that the testing distance between a testee and testing equipment is obtained through an infrared distance measurement method; calculating the size of a sighting mark based on the test distance, and generating a random sighting mark with the corresponding size through test equipment; collecting a target image sequence of a testee and extracting a gesture image sequence; segmenting the gesture image sequence based on the continuity of the action, and extracting an image to be recognized; and obtaining a vision test result based on the to-be-recognized image. According to the method, infrared distance measurement, dynamic sighting mark generation and a gesture recognition algorithm are combined, a collected image sequence is simplified, the problems that vision testing depends on a fixed distance, the size is large, cost is high, individuation is lacked, operation is complex, and the real-time data processing amount is large are solved, and convenient, efficient and accurate self-service vision testing is achieved.

A booth, for using the Teller technique to quantify visual acuity, irrespective of a patient's verbal ability booth comprises a modular structure, making up an isolated environment for the patient to perform the acuity test through the reading of Teller cards. The patient is accommodated in a visualization area at the central portion of a movable wall sliding via wheels on rails installed on the ground and ceiling by profiles. The modular structure presents a white and opaque tone, as well as its own lighting which is controlled and proper according to the test, in front of a movable wall and coplanar to a rear wall of booth. The movable wall sliding effects the distance adjustment between the patient and the visualization area cards where the minimum distance is equivalent 38 centimeters and the maximum distance is 55 or 84 centimeters as accuracy dictates, according to the patient's features.

1. Name of the Design Product: Remote Control (YPB-2100). 2. Use of the Design Product: Used to control a liquid crystal visual acuity chart. 3. Design Key Points of the Design Product: Lies in the shape. 4. Picture or Photograph that Best Illustrates the Design Key Points: Perspective View 1.

The utility model belongs to the technical field of vision examination, and particularly relates to a height-adjustable vision examination device which comprises a visual chart and at least two fixing supports, the fixing supports are installed on the vertical face behind the visual chart in parallel, and a transverse first support is fixedly arranged between the two fixing supports. A sliding rail corresponding to the fixing support is arranged on the rear surface of the visual chart, a sliding way is formed in the surface of the side, close to the fixing support, of the sliding rail, a sliding block is fixedly arranged on the side, close to the sliding rail, of the fixing support, and the sliding block extends into the sliding way and is in sliding connection with the sliding rail. The visual chart is manually or electrically adjusted, so that the height of the visual chart can be adjusted according to the eye height of a testee, the requirements of different testees are met, and the accuracy and comfort of vision detection are improved.

1. Name of the product in this design: Vision Chart Projector (WZ-3000AT). 2. Purpose of this design: For projecting charts to measure visual acuity. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention relates to a vision detection device and a control method. The vision detection device comprises a rectangular movable base, and a detection device and an eye shielding device arranged on the detection device are arranged on the movable base; the movable base comprises a fixed base, an up-down lifting device is arranged on the fixed base, the up-down lifting device is provided with a horizontal moving device, and the detection device comprises a detection base and a detection panel; the detection base is provided with a stepping motor; a supporting panel is arranged at the front end of an output shaft of the stepping motor; visual chart detection characters are arranged on the supporting panel; the direction of the visual chart detection character opening changes along with rotation of the stepping motor. According to the vision detection device, self-service vision detection can be achieved, the detection character position and the opening direction can be automatically adjusted, it is ensured that the detection character is in front of the detected eye, errors are reduced, the detection precision is improved, the detection efficiency and the authenticity and correctness of data are ensured, and the vision detection efficiency is improved.

The application discloses an electronic visual acuity detection method and system based on automatic correction of detection distance, and relates to the field of visual acuity detection. The method comprises the following steps: obtaining a target detection distance mode of a subject, and controlling an electronic visual acuity display terminal to enter a corresponding target state. Spatial position information between the subject and the terminal is obtained, and spatial validity is determined based on distance error. If the spatial validity is valid, the position information is recorded and detected. If the spatial validity is invalid, the position information is corrected and re-measured until the spatial validity is valid. The valid position parameters are matched with the target mode, distance correction parameters are determined, a standardized visual acuity detection result is automatically generated in combination with a recognition result of the subject on the target, and the original detection result, the mode, the position parameters, the correction parameters and the standardized result are saved in a structured format. The application solves the problems of inaccurate distance, manual correction, incomplete result recording and non-standard detection process of the existing electronic visual acuity chart in different detection distance applications.

The utility model discloses a suspension type liquid crystal visual chart which comprises a liquid crystal visual chart body, a U-shaped installation block and a flat plate supporting piece. Fixing holes are formed in the four corners of the flat plate supporting piece in a penetrating mode, butt joint opening grooves are fixedly formed in the front end face of the flat plate supporting piece, and butt joint opening convex grooves are fixedly formed in the two sides of the rear end of the U-shaped mounting block; limiting straight sliding grooves are formed in the upper side and the lower side of the middle of the rear end of the liquid crystal visual chart body, limiting straight sliding tables are arranged on the inner sides of the upper end and the lower end of the U-shaped mounting block, limiting open grooves are formed in the middles of the limiting straight sliding tables in a penetrating mode, and internal thread transmission holes are formed in the outer ends of the limiting open grooves in a penetrating mode; the inner wall of the internal thread transmission hole is in threaded connection with a pushing screw rod, and the inner side of the pushing screw rod is rotationally connected with a pushing plate through a rotating shaft. According to the liquid crystal visual chart, the liquid crystal visual chart body can be hung conveniently through the U-shaped installation block, and meanwhile the U-shaped installation block and the liquid crystal visual chart body can be separated and detached conveniently.