14 results about "Eye chart" patented technology

An ophthalmologic apparatus includes a first visual target presenting unit that presents a first eye chart including a visual target, at a first examination distance, to an examinee's eye of which a trial lens is disposed ahead, and a second visual target presenting unit that presents a second eye chart including a visual target, at a second examination distance different from the first examination distance, wherein the first eye chart and the second eye chart are presented adjacently in plan view in a presentation region in which no influence of aberration of the trial lens is present, within a range viewable by the examinee's eye through the trial lens.

The invention discloses an infrared remote control visual chart-oriented synchronous mirror image control vision examination auxiliary system, which comprises an infrared receiving and transmitting device and a PC terminal, the infrared receiving and transmitting device comprises a development board, an infrared receiving module and an infrared transmitting module, and the PC terminal comprises a PC and is equipped with a bar code or two-dimensional code scanning gun and a bar code thermal printer. The PC is connected to an internal network and is connected with the development board; a signal pin of the infrared receiving module is connected with a digital pin D3 of the development board, a signal pin of the infrared transmitting module is connected with a digital pin D2 of the development board, and power supply pins of the infrared receiving module and the infrared transmitting module are respectively connected with a 5V pin and a GND pin of the development board; coding analysis software for infrared remote control of the visual chart and synchronous mirror image software for the infrared remote control visual chart are written in the PC, an infrared signal analysis database is established through the coding analysis software, and the software receives and sends infrared coding data through a COM port and an infrared receiving and emitting device.

The application discloses a kind of fast calibration sight line tracking methods, comprising: by accessing camera, extract each frame image in real-time video, obtain the image of face area;Image pre-processing module is used to the image pre-processing of obtained picture, and the pupil center point coordinate is obtained;Diagonal line two-point calibration is used, and the functional relationship between screen diagonal line L and the w and h of screen is constructed;Calibration module is set to be able to immediately enter standby calibration state when camera continuous multiple frames are not detected face, and after detecting face again, it will immediately start calibration module and carry out human eye calibration work;The mapping function between the center point of the center point between the pupils of two eyes and computer cursor is constructed by the eye chart data obtained in calibration work process, and then the eye chart data of any moment is substituted into mapping function, and the gaze point coordinate on screen at this moment can be obtained and mouse movement and single-click operation are controlled.The sight line tracking method calibration speed is fast, and time is saved.

The utility model discloses a liftable visual chart which comprises a reverse plate, one side of the reverse plate is rotatably connected with a fixed base, two ends of the fixed base are provided with fixing lugs, a sliding block is arranged in the fixed base, the side edge of the fixed base is provided with a locking pulley, two sides of the locking pulley are provided with sliding grooves, and the locking pulley is provided with a sliding groove. A stopping block is connected to the sliding groove in a sliding manner; the visual chart can be hidden behind the decorative picture through the reversing plate and the fixed base and displayed when vision detection is needed, the attractiveness in families is improved, the height of the visual chart can be adjusted through the sliding block, and the visual chart is suitable for family members of different heights and universal.

The invention belongs to the technical field of vision screening, and discloses a rapid children vision screening system and method based on the Internet of Things. The system comprises a screening terminal device, an Internet of Things communication device and a cloud server. The method comprises the following steps: collecting real-time basic information of a child, and uploading the real-time basic information to a cloud server; generating a real-time vision screening strategy according to the real-time basic information; according to a real-time vision screening strategy, selecting visual chart elements from a visual chart element library, generating a real-time visual chart page, and sending the real-time visual chart page to screening terminal equipment; visualizing the real-time visual chart page, collecting real-time interaction data of the child, and uploading the real-time interaction data to a cloud server; and according to the real-time vision screening strategy, analyzing the real-time interaction data to obtain a real-time vision screening analysis result, and sending the real-time vision screening analysis result to the screening terminal equipment. According to the invention, the problems of high hardware cost, low efficiency, poor effect, dependence on professionals and poor real-time performance in the prior art are solved.

The application discloses a VRAR binocular 3D target positioning method based on deep learning, which comprises the following steps: collecting an eye chart video of a human eye tracking interest point Pc variation, analyzing the state when the eyes are stable, and analyzing the time required for a position change of the eye tracking interest point; a binocular 3D positioning model is constructed, including a feature extraction model based on a pupil-corneal reflection vector method, a 3D positioning model and a feature fusion module; each small eye chart change video and various features are taken as input parameters, and the three-dimensional coordinates of the interest point are taken as output parameters, which are input into a position recognition model for training and learning to obtain a trained position recognition model which is used in the practical stage; then, the position recognition model is saved and updated to a data set and used as a personal data set of a user to improve the adaptability of the personal model to the user.

This application discloses an automatic generation method and system for variable distance correction results of electronic vision charts, relating to the field of electronic vision testing. The method includes: obtaining the target examination distance of the examinee and configuring a target examination distance mode based on the target examination distance; performing vision testing on the examinee according to the target examination distance mode to obtain the original recognition result; extracting correction parameters corresponding to the original recognition result from the distance correction relationship, and using the correction parameters to convert the original recognition result to generate a standardized vision result; performing a format conversion on the standardized vision result according to the target format to obtain the format-converted standardized vision result; and generating a structured variable distance correction result. This application improves the automation level of variable distance correction and standardized result generation of electronic vision charts, and can perform multiple format conversions and structured recording, facilitating multi-scenario use and interconnection, and enabling collaborative product applications with existing modules.

The embodiment of the invention provides a regional eye movement tracking user parameter calibration method. The method comprises the following steps: collecting a calibration eye pattern of each calibration point watched by a human eye; determining a calibrated pupil feature and a calibrated light spot feature of each calibration point; calculating a calibrated cornea curvature radius and a calibrated cornea curvature center of each calibration point according to the calibrated pupil feature and the calibrated light spot feature of each calibration point; determining the calibration optical axis direction of each calibration point and the distance from the calibration pupil center to the calibration cornea curvature center according to the calibration cornea curvature center and the calibration pupil center of each calibration point; calculating an included angle between the calibration optical axis direction and the calibration visual axis direction of each calibration point; and collecting an actual eye pattern, and calculating the actual optical axis direction of the actual eye pattern according to the included angle and the actual optical axis direction of the actual eye pattern. By performing regional calibration on each calibration point, the eye movement tracking accuracy and precision are improved.

The invention discloses a visual chart device, method and system for measuring adjustment amplitude and gathering near points, and particularly relates to the technical field of medical optical equipment, and the technical key points are as follows: a sighting target display module, which is used for displaying sighting targets based on the size of the sighting targets calculated by a calculation processing module; the distance measuring module is used for measuring the real-time distance between the eyes of the detected person and the sighting mark display module; the calculation processing module is used for responding to the distance recording signal, acquiring the real-time distance measured by the distance measuring module based on the distance recording signal, and calculating to obtain an adjustment amplitude and a set near point; the recording signal input module is used for acquiring a distance recording signal and inputting the distance recording signal into the calculation processing module; acquiring a distance recording signal input by the detected person, and recording a real-time distance measured by the distance measuring module at the current moment based on the distance recording signal; and calculating the adjustment amplitude and the set near point by using the real-time distance measured at the current moment.

The invention discloses a portable integrated optical zoom subjective optometry unit, which comprises an equivalent sighting mark device, a continuous zoom optical assembly and a focal power display device, and is characterized in that the continuous zoom optical assembly comprises a first spherical negative lens, a first spherical positive lens and a second spherical negative lens which are sequentially arranged on the same optical axis; the equivalent sighting target device comprises an optical component and an equivalent sighting target plate, the optical component and the first spherical positive lens are arranged at a fixed interval with the same optical axis, the second spherical negative lens is located between the optical component and the first spherical positive lens, the optical component has positive focal power, and the focal power display device displays the overall focal power of the continuous zoom optical assembly; and the sighting target on the equivalent sighting target plate is equivalent to a standard sighting target on a standard visual chart at a standard distance from the optical component. The portable optometry device greatly improves optometry portability, has the same detection standard as a standard visual chart for optometry, and is accurate and reliable in optometry structure.

The application provides a refraction detection method, device and equipment. The refraction detection method comprises the following steps: obtaining an objective refraction diopter of a user's eye; in response to a first observation result of the user on a letter chart, adjusting a diopter of an initial lens to an initial refraction diopter to obtain an adjusted lens, the first observation result being obtained by the user observing the letter chart through the initial lens, and the diopter of the initial lens corresponding to the objective refraction diopter; displaying an optometry chart based on the initial refraction diopter and an astigmatism diopter of the user, the optometry chart comprising at least one of a red-green test chart and an astigmatism test chart; and in response to a second observation result of the user on the optometry chart, obtaining a refraction diopter of the user. The application can automatically adjust the diopter of the lens based on the observation result of the user on each test chart, complete the refraction detection of the user, and effectively improve the efficiency of the refraction detection without the operation of an optometrist.

The utility model relates to the technical field of medical detection, and discloses a vision detection device which comprises a visual chart, a plane mirror and a moving device, the plane mirror and the visual chart are arranged at an interval, an imaging surface of the plane mirror is arranged opposite to the visual chart, and a person to be detected is located between the visual chart and the plane mirror. The visual chart is presented by the plane mirror; the moving device is connected with the plane mirror, or the moving device is connected with the visual chart and the plane mirror, and is used for adjusting the distance between the to-be-detected person and the visual chart presented by the plane mirror; the moving device drives the plane mirror to move or simultaneously drives the plane mirror and the visual chart to move, so that the distance between the to-be-detected person and the visual chart presented in the plane mirror can be adjusted. On the basis, the distance between the to-be-detected person and the visual chart presented by the plane mirror can be adjusted without moving the position of the to-be-detected person, so that the technical effect of improving the simplicity and convenience of vision detection is achieved.

This invention relates to the field of medical device technology, and more particularly to a tool and method for determining the optical magnification of an optical microscope. The tool includes several columns of graphic blocks drawn on a background plate. Each column of the graphic block combination includes four graphic blocks of equal size. The distance between adjacent graphic blocks is equal. The shapes and sizes of the graphics drawn on the graphic blocks in the same column are the same, but their orientations are different. The sizes of the graphics drawn on adjacent columns decrease by a factor of 1. This invention provides a new, simplified standard for optical magnification, using a method similar to a human vision chart. It is the first to utilize the human retina's resolving limit of 0.10-0.20 mm, representing a cross-disciplinary research achievement between medicine and optics. It solves the technical problem of the lack of a unified standard for determining optical magnification in the market. It can determine the performance differences between different optical magnifying glasses and different optical microscopes.