54 results about "Visual acuity chart" patented technology

The invention provides a remote control adjustable visual acuity chart, and belongs to the technical field of visual acuity charts. The remote control adjustable visual acuity chart comprises a box body formed by connecting an outer shell and a panel. A bottom plate and a guide plate are arranged in the box body in parallel. Vision mark rotating systems are arranged between the bottom plate and the guide plate in a matched mode. A control circuit board used for controlling the vision mark rotating system is fixedly arranged on the guide plate. Each vision mark rotating system comprises a motor fixedly arranged on the bottom plate, a rotating sleeve connected with the motor in a transmission mode, a lampshade fixed to the rotating sleeve, and a vision mark fixed to one end of the lampshade. Lamp holders are arranged in the lampshades in a matched mode. A set of LED bulbs are fixedly arranged on each lamp holder. The remote control adjustable visual acuity chart has the advantages that the vision marks are reduced; the influences on view angles are reduced, and the testing accuracy is improved; due to the remote control, no indication sticks are needed, and the influences of the indication sticks do not exist; meanwhile, due to the fact that only one grade of illumination is used in each time of remote control, the view marks randomly rotate, and the possibility that tested people improve the tested vision by remembering the visual acuity chart is eliminated.

Eye chart for testing visual acuity which includes a plurality of optotypes 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.

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.

The invention discloses a visual acuity chart device, a vision self-testing system and a self-testing method. The visual acuity chart device, the vision self-testing system and the self-testing method solve the problems that the existing physical examination or vision check is completed only under the assistance by workers or medical staff, the self check cannot be performed, and the change of vision diminution cannot be timely found when a student studies in a classroom for a long time. The visual acuity chart device, the vision self-testing system and the self-testing method are technically characterized in that by utilizing the brightness compensation automatic control on a backlight source, the accuracy and reality of vision testing are improved, the vision change of the student can be known by a school, parents and the student self, and the effects of early finding, early prevention and early treatment are realized.

The invention provides a remote control adjustable visual acuity chart, and belongs to the technical field of visual acuity charts. The remote control adjustable visual acuity chart comprises a box body formed by connecting an outer shell and a panel. A bottom plate and a guide plate are arranged in the box body in parallel. Vision mark rotating systems are arranged between the bottom plate and the guide plate in a matched mode. A control circuit board used for controlling the vision mark rotating system is fixedly arranged on the guide plate. Each vision mark rotating system comprises a motor fixedly arranged on the bottom plate, a rotating sleeve connected with the motor in a transmission mode, a lampshade fixed to the rotating sleeve, and a vision mark fixed to one end of the lampshade. Lamp holders are arranged in the lampshades in a matched mode. A set of LED bulbs are fixedly arranged on each lamp holder. The remote control adjustable visual acuity chart has the advantages that the vision marks are reduced; the influences on view angles are reduced, and the testing accuracy is improved; due to the remote control, no indication sticks are needed, and the influences of the indication sticks do not exist; meanwhile, due to the fact that only one grade of illumination is used in each time of remote control, the view marks randomly rotate, and the possibility that tested people improve the tested vision by remembering the visual acuity chart is eliminated.

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.

The invention discloses a vision detection method, device, electronic equipment and computer storage medium. The method includes measuring the test distance between the subject and the vision chart box; The display size of the visual acuity chart; through the adjusted visual acuity chart, the visual acuity test is performed on the subject to obtain the visual acuity value of the subject. Through the above method, the visual acuity detection process is not affected by the venue, even when the venue does not meet the standard distance, the visual acuity can still be accurately detected, which is very convenient.

The invention discloses a multifunctional detection visual acuity chart which comprises a rectangular plate body, wherein plugging slots are formed in the rectangular plate body; a black plugboard and a red plugboard are respectively plugged into the plugging slots; the front end surface of the rectangular plate body is coated with a green coating layer; a plurality of circular grooves are formed in the green coating layer; circular turntables are connected into the circular grooves in a plugging manner; E-shaped grooves are formed in the circular turntables; the E-shaped grooves are communicated with the adjacent plugging slots in the rectangular plate body; four positioning slots are formed in the upper, lower, left and right side walls of each circular turntable; the connecting line of two positioning slots at opposite positions is a horizontal line or a vertical line; four positioning ball-head plungers corresponding to the positioning slots are screwed into the inner side walls of the circular grooves; ball heads of the positioning ball-head plungers are embedded into the corresponding positioning slots; arc-shaped shifting handles are formed on the circumferential edges of the surfaces of the circular turntables; the shifting handles are positioned between the adjacent positioning slots. The multifunctional detection visual acuity chart can simultaneously detect red-green color-blindness, and the direction of E can be changed to prevent cheating.

The invention provides an intelligent vision detection system. The intelligent vision detection system comprises an intelligent visual chart and an input device, the intelligent visual chart comprises a chart box, and a visual chart panel is arranged on the chart box. The visual chart panel is provided with test standard characters, the rear part of the visual chart panel is provided with LED indicating lamps, and the positions and the number of the LED indicating lamps are in one-to-one correspondence with those of the test standard characters on the visual chart panel; the meter box is also internally provided with a single-chip microcomputer programmable controller, a signal receiver and a loudspeaker. The LED indicating lamp, the signal receiver and the loudspeaker are all connected with the single-chip microcomputer programmable controller through signal lines. A direction selection module and a signal sending module are arranged in the input device; the method and the device are used for realizing intelligent operation of vision detection and improving the accuracy and efficiency of vision detection.

The invention discloses a visual chart which is characterized in that positions of visual chart symbols of the same visual value on the visual chart are interchangeable. According to the visual chart, through manual or circuit exchange, free adjustment of the visual chart symbols of the same visual value on the visual chart is achieved, and the problem that in the prior art, recitation of the visual chart cannot be coped with is solved.