12 results about "High level vision" patented technology

The invention discloses a vision tester, and relates to the field of visual function measurement. The vision tester comprises a display, a computer and a selector, every two of the display, the computer and the selector are in communication connection; during vision examination, a testee is positioned right opposite to the display; the display is used for displaying sighting marks with different sizes and shapes; the selector is worn by a testee and is used for collecting a sighting mark identification result of the testee; and the computer is used for determining the vision examination result of the testee according to the identification result of the testee on the sighting mark. According to the visual acuity tester, visual acuity screening is not limited by scenes, and convenience and accuracy of visual acuity screening can be improved.

The application relates to a vision detection method, system, device and medium, and belongs to the technical field of vision detection. The vision detection method comprises the following steps: acquiring identity feature information of a subject, determining a vision chart type, generating a corresponding vision chart and displaying the vision chart; according to a preset rule, selecting a test target image one by one as a test target image for highlighting display, and collecting a response signal of the subject to each selected test target image until a preset test number is reached; verifying the response signal of the subject each time according to the correct direction of each selected test target image to obtain a response verification result; acquiring a response time corresponding to the response signal of the subject each time and a test target image difficulty; and calculating a vision index based on the test target image difficulty, the response verification result and the corresponding response time of each test to obtain a vision detection result of the subject. The application can improve the accuracy of the vision detection result.

The application discloses a focusing lens for laser myopia operation scanning, which is composed of seven lenses. The seven lenses are arranged in sequence along the light transmission direction, and are a plano-concave lens for diffusing an incident light beam, a first plano-convex lens for converging the diffused light beam into a parallel light beam, a second plano-convex lens for focusing a target in the light beam deflection process, a lenticular lens for converging the light beam into a parallel light beam, a double-concave lens for adjusting the focal length, a third plano-convex lens for re-converging the light beam into a parallel light beam, and a window piece for transmitting light. The focusing lens can focus laser light energy into a very small space area, and thus the operation precision is high and the vision correction range is large in the laser myopia operation scanning process.

The application discloses a scleral lens fitting method based on the sag depth of different regions of the corneosclera, and pre-establishes an optimization interval table of the sag height and base arc curvature radius of an optical zone; an optical device is used to visually scan the corneosclera to generate a basic model of the corneosclera; a first sag height corresponding to the optical zone, a second sag height corresponding to the PCZ, a third sag height corresponding to the LCZ and a fourth sag height corresponding to the SLZ are measured from the basic model; the optimization interval table is called by using the target sag height to obtain the target base arc curvature radius; a scleral lens curve model is constructed on the basic model of the corneosclera; the ring curvature of the scleral lens curve model is adjusted by the sag height change of each region to obtain an optimized scleral lens curve model. The scheme can be adapted to the vision change of a user by simply measuring the sag depth and modeling, and adjusting the base arc curvature radius and the ring curvature according to the new data, thereby providing a very flexible and improved fitting efficiency method, and the effect of vision correction can be significantly improved.

The invention discloses a visual training animation production method and device, equipment and a medium, and relates to the technical field of visual training, and the visual training animation production method comprises the following steps: obtaining a plurality of display elements, and mapping the display elements to a virtual three-dimensional space provided with a perspective camera; the display elements are replaceable elements; the display elements are to-be-displayed elements stored in an associated medium of the display device and / or elements displayed in a reference area of the display device; determining a moving direction vector corresponding to the display element, and moving the display element in the virtual three-dimensional space according to a preset element moving sequence on the basis of a preset moving rule and the moving direction vector corresponding to the display element, the display elements are projected and rendered to the reference area by using the perspective camera every preset frame rendering time interval so as to complete animation production; the preset movement rule is that the display element moves between the farthest plane and the nearest plane. The convenience and universality of visual training can be improved.

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.

An eyesight training device, aiming at achieving customized eyesight training effects by adjusting the aperture for light beams entering the fundus. The device comprises a laser, a homogenizer plate, a field stop, a lens, an aperture stop, a light source holder and a viewing tube, wherein the laser is used for emitting training light beams; the homogenizer plate homogenizes the light beams; the field stop limits the range of the light beams; the lens is used for focusing the light beams; the aperture stop regulates the aperture of the light beams entering the fundus so as to control the size of a light spot on the retina; the light source holder is used for mounting and fixing these components; and the viewing tube guides the light beams to an eye of a user. By adjusting the aperture stop, the device can flexibly control the size of a light spot, so as to adapt to the requirements for the eyesight of different users, and the device is especially suitable for eyesight training of patients with myopia, hyperopia and astigmatism. The device has a compact structure and is easy to operate, can effectively improve effects and safety of eyesight training, and meets customized eyesight rehabilitation requirements of users.

The utility model discloses a visual training device and equipment, and aims to realize a personalized visual training effect by adjusting the aperture of a light beam entering fundus. The device comprises a laser, a dodging sheet, a field diaphragm, a lens, an aperture diaphragm, a light source seat and a sight tube. The laser is used for emitting training light beams, the light uniformizing sheet uniformizes the light beams, the field diaphragm limits the range of the light beams, the lens is used for focusing the light beams, the aperture diaphragm adjusts the aperture of the light beams entering the fundus, and therefore the size of light spots on the retina is controlled. The light source base is used for installing and fixing the components, and the sight tube guides light beams to the eyes of a user. The device can flexibly control the size of the light spot by adjusting the aperture diaphragm so as to adapt to vision requirements of different users, and is particularly suitable for vision training of patients with myopia, hyperopia, astigmatism and the like. The device is compact in structure and easy and convenient to operate, the visual training effect and safety can be effectively improved, and the personalized visual rehabilitation requirement of a user is met.

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.

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.

Lenses and methods are provided to improve a patient's peripheral and central vision. The lenses improve visual acuity by having optical elements configured to provide optimal peripheral vision, for example, minimizing off-axis astigmatism with a 20-degree eccentricity, while maximizing axial visual acuity and contrast sensitivity. The method provides an IOL design that reduces optical errors in the image generated at a peripheral retinal position of the patient's eye, positioned at a certain distance from the fovea, while maximizing axial visual acuity and contrast sensitivity.