98 results about "Eye chart" patented technology

The invention relates to a selection method for visual targets of a Chinese character eye chart. The method comprises the following steps of: carrying out spatial frequency component analysis after converting Chinese characters into picture formats, then working out a mean of the frequency spectrum energy of spatial frequencies, adopting cluster analysis to cluster images of Chinese characters, selecting a group of Chinese characters similar with the mean of the frequency spectrum energy, and selecting Chinese characters which simultaneously have horizontal strokes, vertical strokes, slant strokes and curved strokes from the group of Chinese characters as the visual targets of the Chinese character eye chart. Besides giving consideration to the factors of stroke number, character frequency, character form, etc., the selection method for the visual targets of the Chinese character eye chart also selects the Chinese characters similar with the mean of the frequency spectrum energy of spatial frequencies as the visual targets through carrying out the spatial frequency component analysis of Chinese character images, thereby meeting the universal laws of a human visual system on Chinese character recognition and identification in a better way. The Chinese character eye chart made from the Chinese character visual targets selected through the method can more correctly detect the threshold value of the font size of Chinese characters read by a testee.

Eye chart for testing visual acuity which includes a plurality of optoptypes arranged in a plurality of lines with each optotype in a line having a uniform resolution throughout and the resolution for each optotype in a given line is the same. The optotypes are generated by standardizing the maximum resolution angle any one letter may have and such is done by utilization of a design circle which represents the maximum resolution.

The invention relates to a voice self-test visual chart, belongs to manufacture technology field of medical appliance. The visual chart consists of display device, character window and voice apparatus, wherein the character window is provided on visual chart display, the voice apparatus includes earphone, mike and voice emitter. Earphone and mike are linked with voice emitter with wire, visual chart display is connected with voice emitter by 'Bluetooth' wireless system. When the chart is used, power will be turned on, and the detecting people wear earphone and mike. When testing character is light, correct direction selection should be made using 'up-down-right-left' voice in desired time limit. When selection is correct, voice of 'correct judgment, go on testing' will be sent out from the earphone, and higher level test will be carried out continuously. When selection is wrong, voice of 'false judgment, go on trying' will be send out from the earphone, the test will stop in this level and continues, no longer upgrades to higher level. The voice self-test visual chart of this invention has following advantages: professional design, simple structure, and convenient for use, etc.

An optometry apparatus includes an eye chart presentation optical system that presents an optometric chart to an eye to be examined as a subjective eye chart for subjective measurement and a control unit that controls the eye chart presentation optical system to present the optometric chart. The control unit executes an instant presentation of the optometric chart by controlling the eye chart presentation optical system to finish presenting the optometric chart when an instant presentation time has elapsed after starting presenting the optometric chart.

The invention relates to an intelligent eyesight detecting device with binocular cameras. Two cameras are placed in an imaging plane, the two cameras have the same focal length and are connected with a computer through image acquisition cards; the computer is connected with a visual chart display device; the binocular cameras are used for photographing an eyesight detected person; the image acquisition cards are used for acquiring images and detecting a face area in the images and positions of double eyes in the face area; the computer is used for calculating the distance between the center of the double eyes of the detected person and a detection character display screen of the visual chart display device; and the computer is connected with wireless transceiving equipment at the computerend, and the computer wireless transceiving equipment is in wireless communication connection with a wireless human-computer interactive device at the eyesight detected person end. The detecting device can be used for conveniently and accurately detecting the eyesight.

The invention relates to an ophthalmic nursing device used for doing eye muscle exercise training and strengthening sight distance. The ophthalmic nursing device comprises a box body (1), a panel (7) at the front of the box body (1), an eye chart (3) arranged in the middle of the panel (7), a background light of an alphabet board arranged in the box body (1) and a plurality of rectus oculi motion guiding lights (2) arranged on different positions of the panel (7). The rectus oculi motion guiding lights (2) are connected with a control circuit in the box body (1) respectively. The invention integrates the ophthalmic nursing device used for doing eye muscle exercise training and strengthening sight distance with an eye chart box as a whole, thus helping a user to do the eye muscle exercise training, strengthen the sight distance and care eyes regularly. In addition, the ophthalmic nursing device also can do regular eye test, so the eye test and the active training for prevention can be implemented simultaneously.

The present invention relates to a remote control self-testing eyesight meter, which belongs to a product in the medical appliance manufacturing technology field. The eyesight meter consists of a display, convertible characters, a remote controller and a direction button. There is a character window on the eyesight meter display, the direction button on the remote controller is inserted in the remote controller, and the eyesight meter display is connected with the remote controller via a 'Bluetooth' wireless system. During use, the power is switched on, and the testee manually holds the remote controller. When the testing characters are on, the testee shall make accurate direction selection in the required time, and the display widow will show smaller characters. When the character direction cannot be selected accurately, the buzzer gives an alarm and smaller testing characters will not be provided any longer. The eyesight meter has such advantages as reasonable design, simple structure and convenient use etc.

The apparatus for measuring differences in the transmission of light through a lens of an eye is an eye chart has two main sections including a test section that displays a shade of a test color and a reference section that displays either a spectrum of shades, or a different shade of, the test color. The chart is displayed in a box, projected on a wall or displayed as a chart hung on a wall. The chart is illuminated using a constant or variable intensity light source. A patient is required to find or make a match between the shades disposed on the chart. When the variable intensity light is used, the patient will be required to adjust the light intensity of the section it illuminates until a match in color shades is made. The chart may be used in conjunction with a Snellen eye chart.

The invention discloses a remotely-controlled visual chart (capable of treating amblyopia and low myopia) with a box, which is characterized in that detection symbols refer to eight openings (upper, lower, left, right, upper-left, lower-left, upper-right and lower-right), eight ensiform remotely-controlled receiving type indicating lamps (at upper, lower, left, right, upper-left, lower-left, upper-right and lower-right) are arranged above a box body, the indicating lamps have eight colors, a remotely-controlled transmitting pedal (divided into upper, lower, left, right, upper-left, lower-left, upper-right and lower-right parts) is correspondingly arranged, the pedal has corresponding eight colors, and the center of the remotely-controlled pedal is provided with a device which can carry out 360-degree rotation. The top of the box body is provided with an inserting slot for replacing visual charts, and 3-5 pieces of symbol vision boards with different detection directions are stored. The remotely-controlled visual chart (capable of treating the amblyopia and the low myopia) with the box can be used for carrying out the ordinary vision detection, and also can carry out the normal vision detection on deaf-mute children, and in the process of vision detection, a tested person is not required to talk but just steps on corresponding arrows while seeing the opening directions or colors of the detection symbols of the visual chart, then the indicating lamps above the visual chart are turned on, so that through cooperating with a vision correction method (application number: 201110270610. X) invented by the inventor of the invention previously, a person with the amblyopia and the low myopia can achieve or are close to be at a condition of normal vision in a short time.

The invention discloses an intelligent vision testing system in the technical field of vision testing, and the system comprises a seat; a support frame is fixedly connected to a right handle of the seat, a motor is fixedly connected to the top of the support frame, and a first base is fixedly connected to the top of the support frame; the first base is rotatably connected with a lead screw fixedly connected with an output shaft of the motor, the top of the supporting frame is slidably connected with a first moving seat and a second moving seat, a table is placed right in front of the seat, and a liquid crystal visual chart used for detecting vision is placed at the top of the table; brushes are arranged, along with leftward movement of a first moving seat, a second gear is matched with a conveying belt to drive a second rotating shaft and a third rotating shaft to synchronously rotate, and the second rotating shaft and the third rotating shaft drive respective brushes to rotate, so the two surfaces, making contact with customers, of the shielding plate are cleaned, the cleanliness of the shielding plate is ensured, and the cross infection is avoided.

The invention discloses a portable visual chart lamp box, and belongs to the technical field of visual charts. The portable visual chart lamp box comprises a lamp box body, a base and a rearview mirror. The base comprises a base body, two wheels and two supporting legs; a storage cavity is formed in the base body, a cover plate for opening and closing the storage cavity is arranged on the top surface of the base body, and a supporting rod is arranged on one side of the cover plate of the base body; the lamp box body is arranged on the supporting rod in a sliding and sleeving mode and is provided with a manual locking screw; the left side and the right side of the lamp box body are each provided with a connecting seat, the connecting seats are made of iron, and the sides, away from the lampbox body, of the connecting seats are each provided with a semispherical groove; the rearview mirror is movably placed in the storage cavity and comprises a mirror body, a connecting rod and a spherical magnet, and the mirror body is fixedly connected with the spherical magnet through the connecting rod; and the mirror body can be adsorbed and mounted on the connecting seats through spherical magnets and can rotate relative to the connecting seats. The visual chart lamp box solves the problems that an existing visual chart lamp box is inconvenient to carry and is not provided with the rearview mirror.

The invention discloses a vision detection system. The system comprises a display body (10) which comprises a first surface (10a), and symbols (11a) used for detecting eyesight are arranged on the first surface (10a); an image acquisition device (21) is arranged on the first surface (10a) of the display body (10) and is used for acquiring an image of a target user in front of the visual chart; a processing device (22) is connected to the image acquisition device (21) and is used for comparing the images acquired by the image acquisition device (21) with a plurality of preset face images to determine identities corresponding to the acquired images; the processing device (22) is further used for determining vision parameters of the user according to feedback of the user; and a storage deviceis used for storing the identity information and the vision parameters corresponding to the acquired images. According to the scheme, the identity information and the vision parameters of the user can be stored, subsequent calling and comparison are facilitated, and customization of vision detection of the target user is achieved.

The invention belongs to the technical field of vision detection, particularly relates to a vision detection device and system, and provides the following scheme aiming at the problem of large deviation of a detected result caused by the light problem and non-changeable serial number of an existing visual chart: the vision detection device comprises an outer frame which is internally provided with a cavity and is integrally of a cuboid structure, an extension rod is fixed to the position, close to the bottom end, of the back face of the outer frame, a U-shaped support is fixed to the bottom end of the extension rod, a first supporting rod and a second supporting rod which are parallel to each other and vertically distributed are fixed to the left side and the right side of the inner wall of the bottom of the outer frame respectively, and rotating stations of the same size are arranged on the circumferential outer walls of the first supporting rod and the second supporting rod respectively. According to the device, the icons at all positions can be replaced in time by rotating the conveying belt, the directions of the icons at all positions can be changed through in-situ rotation, and cheating behaviors caused by long-time use are effectively avoided by replacing the overall positions and the opening directions of the icons in a combined mode.

An eyesight testing apparatus comprises a light generating assembly for generating a parallel light beam, a test assembly comprising a pictorial tablet on which an eye chart is provided, and an imaging assembly comprising a plurality of convex mirrors for amplifying and imaging a projected pattern at a distance. A first shell is provided with a first cavity, a first opening and a second opening. The light generating assembly and the imaging assembly are arranged in the first cavity, and the pictorial tablet is arranged between the light generating assembly and the imaging assembly. Parallel light generated by the light generating assembly irradiates the pictorial tablet to project the eye chart onto the imaging assembly, and the imaging assembly amplifies and images the eye chart at a distance. With the eyesight testing apparatus of the present disclosure, previous cumbersome test mode is abandoned, and whether the eyesight of a person has a problem (e.g., myopia) can be detected as long as the eyesight testing apparatus is placed on eyes; the cost is reduced, so that the apparatus can be used by more people; and the test can be conducted anytime and anywhere.

The invention discloses a vision detection method and device and intelligent electronic equipment. The method comprises the following steps: obtaining the model of the intelligent electronic equipment, and matching a visual chart according to the model, the visual chart comprising a left eye sighting mark image and a right eye sighting mark image; acquiring a request of a tester, and controlling the intelligent electronic equipment to display the left eye sighting mark image or the right eye sighting mark image according to the request; obtaining a judgment result of a tester on a sighting mark symbol display direction on the left eye sighting mark image or the right eye sighting mark image; and outputting a vision detection result according to the judgment result. By means of the mode, under the conditions that left-eye and right-eye vision separating devices do not need to be worn and the left eye and the right eye do not need to be alternately shielded, the left-eye vision and the right-eye vision can be detected respectively, and convenience, flexibility and high efficiency are achieved.

The invention provides a visual chart for self-test and a using method thereof. An E-shaped sighting mark in the visual chart adopts three squares with equal length, and a high-pass resolution designis adopted; the ratio of a boundary to a core to a boundary is 1:2:1, the average brightness (the black core and a white frame) of a letter E is matched with the brightness of a gray background, and the contrast ratio is 100%; during self-testing, an intelligent terminal such as a mobile phone is used; and five sighting marks in one row are displayed in each testing, the distance between the sighting marks in each row is the width of one sighting mark in the row, and the 14 rows of sighting marks are arranged from LogMAR 1.0 to logMAR-0.3. A testing method comprises the following steps of: S1,starting from the first row, extracting one sighting mark from each row for answering; S2, entering the next row if an answer is correct; S3, if the answer is wrong, returning to the previous row andgenerating the whole row of sighting marks; and S4, entering the next row if one error occurs in the answer, entering the previous row if two or three errors occur in the answer, and ending the testing when four or more errors occur.

The invention discloses a vision detection system, which comprises a host device, the host device comprises a display module used for displaying sighting marks of a visual chart, the host device receives direction indication signals sent by a subject through a remote control device in a wireless mode, and if the display module continuously displays the sighting marks in the same row, the host device counts the continuous and correct first correct times of the subject, the second correct times within the preset time, the third correct times of the detection line and the total detection time of the detection line, and determines whether the first condition, the second condition and the third condition are met or not, and if any one of the three conditions is met, the host device performs a down-regulation operation based on the current row, and if the three conditions are not met, the host device carries out up-regulation operation on the basis of the current row, and monitors up-regulation or down-regulation operation of the plurality of detection rows to obtain the eyesight of the left eye or the right eye of the subject. According to the invention, the vision detection system and the vision detection method which can perform autonomous detection are provided.

Belonging to the field of visual charts, the invention discloses an intelligent adjustable multifunctional Chinese character visual chart. The intelligent adjustable multifunctional Chinese charactervisual chart comprises a wallboard, supporting seats are fixedly mounted on both sides of a lower end on the outer surface of the wallboard through mounting bolts, the inner side surfaces of the supporting seats are connected to supporting shafts, a frame is fixedly installed at the outer ends of the supporting shafts, an outer surface of the frame is rotatably installed to the outer surfaces of the supporting bases, a display screen is fixedly mounted at the front end inside the frame, a main board is fixedly mounted at an inner center of the frame, a cover plate is hinged to a rear side surface of the frame, a receiver is fixedly installed on a lower surface of the frame and is connected to the main board in series through a circuit, and fixed hooks are fixedly installed at middle positions of two sides on the outer surface of the wallboard, thus greatly improving the use convenience and stability, and guaranteeing the precision of eyesight testing.

The invention discloses a self-service vision examination device. The self-service vision examination device comprises a pavilion body, wherein an equipment board is arranged in the pavilion body anddivides the pavilion body into an equipment area and an examination area; the equipment area comprises a sighting mark projector, a controller, a printer, a display screen, a paper currency and coin slot machine and a keyboard; the examination area comprises an eye shielding plate, a seat and a glass door; a sampling port, a display screen window, a keyboard window, a sighting mark projector window, a door switch, an LED lamp and a loudspeaker are arranged on the equipment board; the seat comprises a seat support, a moving sleeve, a screw, a fixing sleeve, a base and a motor; a driving motor,a driving rod and an arc-shaped moving groove are arranged at the top end of the examination area; and the eye shielding plate comprises a shielding plate and a connecting rod, one end of the connecting rod is connected with the shielding plate, and the other end of the connecting rod is connected with the driving rod. The self-service vision examination device can be used for self-service visionexamination and provides different visual charts for different people, and the examination accuracy can be guaranteed by visual chart icons appearing randomly; the self-service vision examination device can adapt to people with different heights, and the seat is convenient to adjust; and the eye shielding plate automatically reaches a preset position to shield an examinee.

The invention discloses an auxiliary vision testing device for the Ophthalmology Department, and relates to the technical field of ophthalmic examination. The auxiliary vision testing device comprisesa bearing device, a lifting device, a testing device, a head fixing frame, a seat and a lighting device, the bearing device comprises a bearing bottom plate and a T-shaped sliding block, the liftingdevice comprises an outer rod and an inner rod, the testing device comprises a long fixing plate, the head fixing frame comprises a fixing block, the seat comprises a bearing base, the lower surface of the bearing base is connected to the upper surface of the bearing bottom plate, and the lighting device comprises a supporting column. According to the auxiliary vision testing device for the Ophthalmology Department, a to-be-tested person sits on the bearing base, the position suitable for the to-be-tested person is adjusted through the positions of an adjusting block and an adjusting cylinderin the head fixing frame, the distance between the to-be-tested person and a eye chart can be changed by sliding the T-shaped sliding block, and the whole device is additionally provided with the lighting device, so that the test result is more accurate, and accurate treatment on the to-be-tested person is guaranteed.

The invention discloses an automatic vision testing system and method. The system comprises a visual chart light box and a mobile terminal, wherein the visual chart light box is in communication connection with the mobile terminal through Bluetooth; the visual chart light box comprises a sighting mark panel, a light isolation plate, an LED light panel, a battery, a mainboard and a backboard; a sighting mark group is arranged on the sighting mark panel, and a corresponding LED lamp is arranged below each sighting mark; each sighting mark row in the sighting mark group is provided with a corresponding sighting mark, the size of the sighting mark is gradually reduced from top to bottom in a stepped mode, and the corresponding standard logarithm vision is gradually increased from top to bottom; and the mobile terminal transmits the selected sighting mark to the mainboard in the visual chart light box, and the mainboard controls the LED lamp corresponding to the sighting mark to be turned on. According to the invention, vision testing and corresponding data processing and judgment are carried out through the mobile terminal, so that hardware and software cost of the visual chart light box is greatly reduced; and meanwhile, vision testing is carried out in combination with voice, images and the like, so that the operation complexity is reduced.

The invention relates to a movable visual chart for the ophthalmology, and belongs to the technical field of vision testing. The visual chart comprises a frame body and a box body. A lifting movable frame is arranged on the upper side of the frame body, a supporting horizontal frame is arranged on the upper side of the lifting movable frame, and a longitudinal adjustment corrector is arranged on the right side of the supporting horizontal frame. The right side of the longitudinal adjustment corrector is provided with a lateral adjustment corrector, the right side of the lateral adjustment corrector is provided with a box support fixing frame, the lower side of the box support fixing frame is provided with a push-pull movable frame, and the lower side of the push-pull movable frame is provided with a detection box. The box body is internally provided with an eyesight detecting strap, the left side of the eyesight detecting strap is provided with a sighting mark detecting chart, the upper side of the eyesight detecting strap is provided with a conversion driving roller, and the lower side of the conversion driving roller is provided with an illumination back light. The visual chart has comprehensive functions, is convenient to adjust, use and operate and capable of being used for conducting normal visual tests on different types of patients in various environments, effectively improving the accuracy of visual test results, and greatly improving the working efficiency of ophthalmic medical staff.

The invention relates to an intelligent optometry unit for the full-automatic tracking of left eye and right eye and a working method of the intelligent optometry unit. The optometry unit comprises a core control module, a server, a display module, a user terminal, a three-degree-of-freedom movement module, an observation window module and a projection mechanism, and the observation window module comprises an infrared light detection mechanism and a photographing mechanism; the infrared light detection mechanism is used for collecting field information to realize the detection and alignment functions of eye positions, and the projection mechanism comprises a COMS measurement camera, a visual chart, an LED light source, an objective lens, a collimating lens, a semi-transparent and semi-reflective mirror A, a semi-transparent and semi-reflective mirror B, a condensing mirror group, a projecting mirror group and a differentiation plate. The observation window module and the projector are combined, movement adjustment is carried out through the three-degree-of-freedom movement module, full-automatic optometry is achieved, accurate refraction parameters can be automatically measured as long as a photographed person aligns the eyes to the observation window, and a report is formed and printed; optometry data are more accurate; and the detection efficiency is greatly improved.

The invention relates to an ophthalmic examination device which comprises a device shell, a driving wheel and a reversing wheel are rotationally assembled in the device shell, the driving wheel is driven by a motor, a circulating belt is wound around the driving wheel and the reversing wheel, a testing visual chart and a demonstration visual chart are sequentially arranged on the circulating belt, the orientation of each letter on the demonstration visual chart is the same as or opposite to the orientation of the corresponding letter on the testing visual chart, the device shell is provided with a doctor observation port corresponding to the row of letters on the demonstration visual chart, the device shell is further internally provided with a test port corresponding to the row of letters on the testing visual chart, a row of letters, opposite to the test port, of the testing visual chart correspond to a row of letters, opposite to the doctor observation port, of the demonstration visual chart, a patient observation port is further formed in the device shell, a test channel with an optical structure is arranged between the patient observation port and the test port, and a light supplementing lamp is arranged in the test channel. The invention provides an ophthalmologic examination device capable of reducing the external environment for vision detection.