13 results about "Visual acuity testing" 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.

This invention provides a myopia screening device. The first end of the housing is designated as the detection end for testing the subject's eyes. A visual target screen, a screening camera, and an optical path assembly are all housed within the housing. The visual target screen is located on one side wall of the housing, the optical path assembly is positioned between the detection end and the visual target screen, and the screening camera is located at the second end of the housing. The screening camera captures a light and shadow image of the subject's pupil. A processor processes and analyzes the light and shadow image captured by the screening camera. An input device communicates with the processor and inputs the image seen by the subject on the visual target screen into the processor. This invention enables not only refractive error testing but also visual acuity testing and color blindness / color weakness testing. Furthermore, this invention can estimate the subject's visual acuity based on the refractive error test results, generate a corresponding estimated visual target based on the estimated visual acuity, and quickly complete the visual acuity test, effectively shortening the visual acuity screening time.

Disclosed herein are system and method for testing and analysis of visual acuity and changes using an acuity model, the acuity model generated based on one or more acuity chart design parameters and candidate acuity parameters calculated using the acuity test data of the subject, the acuity model comprising a chart-specific psychometric function determined using a family of multiple-optotype psychometric functions, and wherein the acuity model is configurable to estimate possibility of obtaining the acuity test data of the subject.

To provide a visual testing tool that enables accurate testing in visual examinations for infants and children, such as the visual examination during the 3-year-old health checkup. [Solution] A visual examination device 1 for use in visual examinations, comprising at least two surfaces, wherein one surface 10 has a target 11 for visual acuity testing, and the other surface 20 has a target 21 for binocular vision testing. Preferably, the target for binocular vision testing is made by attaching alternating strip-shaped images for the right eye and left eye to a lenticular lens, and more preferably, the target for visual acuity testing and the target for binocular vision testing are made such that the testing distance for visual acuity testing using the target for visual acuity testing is the same as the testing distance for binocular vision testing using the target for binocular vision testing, in which case the testing distance is preferably 30 cm to 40 cm.

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.

A head-mounted device and related method may increase visual acuity during content presentation by determining spatial displacements between an eye and the lens vertex; generating translational transformation parameters by generating a translation matrix based on the spatial displacement; and applying transformation parameters to ensure accurate visual alignment during visual acuity testing.

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.

A virtual eye test for evaluating visual acuity can be conducted in a virtual reality (VR) environment. The test uses an electronic device with a head-mounted display (TIMID) and a camera. The device generates a VR user interface corresponding to a three-dimensional virtual environment and renders it on the HMD. A testing sequence with progressively finer details and varying depths is displayed in the VR interface. The device tracks eye movements and response times to visual stimuli presented in the sequence, using the camera. User responses are evaluated based on these measurements to test visual acuity.

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.

Systems and methods for administering a visual acuity test include using a computing device including an image capturing device and a display screen. One or more images of a test subject are captured and used to determine a separation distance between the computing device and the test subject. Identifying data provided by the computing device can be used to determine device characteristics of the image capturing device and display screen so that the separation distance can be estimated and so that graphics (e.g., optotypes) can be produced by the display screen at a size related to the separation distance and to the display screen's characteristics. Parts of a visual acuity exam can be administered as a test subject vocally reads the graphics, their vocal input is recorded, analyzed, and scored. Systems may use object detection algorithms to track whether the test subject has covered an eye with an appendage.

The invention relates to the technical field of vision testing, in particular to a dynamic sighting mark generation and gesture feedback interactive vision testing system which comprises a sighting mark generation module, a gesture recognition module and a feedback adjustment module. The sighting mark generation module generates an initial sighting mark according to a preset rule and dynamically adjusts the size, position and shape of the initial sighting mark; the gesture recognition module captures gesture actions through a camera and analyzes direction, speed and force information; and the feedback adjustment module calculates sighting mark adjustment parameters based on the gesture analysis result, and optimizes a display strategy in combination with ambient light and screen brightness. Through non-contact gesture interaction and dynamic sighting mark adjustment, the accuracy and the individuation degree of the test result are improved, predictive adjustment is achieved based on deep learning, and the user experience and the intelligent level are remarkably improved.

The present invention relates to determining at least one individual visual acuity value for at least one eye of a subject, wherein a corresponding method comprises: determining at least one individual subjective visual acuity value for the at least one eye based on an individual response of the subject to a visual task; acquiring individual objective measurement data for the at least one eye from measurements on the at least one eye; and determining at least one combined visual acuity value from the at least one individual subjective visual acuity value and the individual objective measurement data as the at least one individual visual acuity value to be determined for the at least one eye of the subject.

The application provides a virtual reality-based visual acuity comprehensive evaluation system and method, which comprises a virtual reality helmet, a handle, and a host terminal; the virtual reality helmet is used for presenting a virtual reality environment to a subject and collecting real-time eye movement data of the subject through an eye movement collection module; the handle is controlled by a single hand of the subject and is used for collecting a visual target model judgment result of the subject; the host terminal is composed of a central processing unit, a memory, a transmission module, a display, and an input device, contains an environment module, an information recording module, an evaluation calculation module, and a result module, is used for providing a virtual environment, collecting data information and completing data processing, and then presenting a result through a host display; the evaluation calculation module contains static visual acuity test, dynamic visual acuity test, and motion visual acuity test units, visual target model data and eye movement data in a test process are collected through different module tests, visual acuity abilities of the subject in different modes are evaluated, and effective help is provided for visual acuity evaluation and scientific research needs.