24 results about "Visual acuity chart" patented technology

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.

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.

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.

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.

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.

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.

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.

The utility model discloses a portable vision examination table, which relates to the technical field of vision examination and comprises an examination table body, a first pulley and a second pulley, an upper rod is mounted above the examination table body, a lower rod is mounted below the examination table body, movable rods are movably mounted on the inner sides of the two ends of the upper rod and the lower rod, and the movable rods are connected with the first pulley and the second pulley. Second sliding grooves are formed in the inner walls of one ends of the movable rods correspondingly, and second sliding wheels are movably installed on the inner sides of the second sliding grooves correspondingly. A pull rod is pulled upwards to make a stop block move upwards, then movable rods on the two sides are pushed inwards to make the movable rods move towards the inner sides of an upper rod and a lower rod, meanwhile, a second pulley moves in a second sliding groove, the second pulley moves to make a connecting belt drive a check meter body to move towards the inner side at the same time to be vertically folded, then the lower rod is rotated, and the check meter is folded. And by reducing the size, the inspection meter is more convenient to carry and work, and the problems that the size is large and the inspection meter cannot be folded and stored are solved.

1. The name of the design product: the graphical user interface of the automatic optometry head data display of the electronic device. 2. The use of the design product: an electronic device. 3. The design points of the design product: the graphical user interface in the electronic device. 4. The picture or photo that best indicates the design points: design 1 front view. 5. Design 1 is designated as the basic design. 6. The use of the graphical user interface: the product interface of design 1-design 2 is the interface for the display and interaction of automatic optometry data; it is used for the user to view subjective optometry data, reports, and data comparison, etc.; the design 1 front view interface is the interactive interface for the display of the free mode under subjective optometry, and the interface buttons can be clicked to perform the operations of switching the list of optotypes, setting the optotypes, switching the modes, and importing data, etc.; the design 2 front view interface is the interactive interface for the display of the AI assisted mode under subjective optometry, and the interface buttons can be clicked to perform the operations of setting, viewing the patient information, setting the interpupillary distance, and setting the visual acuity chart, etc.

Provided are a visual acuity test method and apparatus, and an electronic device, a medium and a computer program product. The method comprises: determining an initial position identifier in a first visual acuity chart corresponding to an estimated visual acuity, wherein the first visual acuity chart comprises a plurality of optotype rows, and each optotype row comprises a plurality of optotypes and one position identifier; feeding back a plurality of initial recognition results corresponding to the initial position identifier; on the basis of the plurality of initial recognition results, determining a first specific optotype row and a second specific optotype row, wherein the first specific optotype row is adjacent to the second specific optotype row, a visual acuity result corresponding to the second specific optotype row is superior to a visual acuity result corresponding to the first specific optotype row, recognition results of a plurality of optotypes in the first specific optotype row are all correct, and the recognition result of at least one optotype in the second specific optotype row is incorrect; and on the basis of the visual acuity result corresponding to the first specific optotype row and the number of optotypes the recognition results of which are correct in the second specific optotype row, obtaining a visual acuity test result. The method is simple and easy to implement, and has a higher accuracy.