30 results about "Visual acuity testing" patented technology

A visual acuity examination is performed on a patient by bringing a confocal imaging apparatus up to a patient's eye. Stimuli at various points in the patient's field of view are generated while the patient fixates on a point. The patient's responses to the stimuli are recorded with the movement of the eye with is tracked with the aid of the confocal imaging apparatus. The position of said stimuli on the retina is corrected to take into account any movement of the eye between stimuli.

The above objects are achieved with a compact neuro-otologic testing device and method of utilizing the same according to the present invention. The device according to the present invention provides an image producing laser with a right hand, servo controlled galvanometric based XY interface. The high quality closed loop servo control system that can drive the target (i.e. the laser image) in excess of 1,000,000 degrees / second2 and at velocities in excess of 12000 degrees / second. The bandwidth of the XY interface is greater than 400 Hz, providing high image reproducibility. The repeatability and position accuracy of the target is +−3 arc-seconds and the field of range of the XY interface are about 60 degrees (i.e. about 60 degrees horizontal and 60 degrees vertical).

When a Landolt ring optotype is presented in a visual acuity testing unit, an examinee answers a position of a slit of the optotype through an operation of a joystick lever or the like. If an examinee gives a right answer within a standard time at a first presentation of optotype, examination at a higher visual acuity grade is executed by presenting a smaller Landolt ring optotype. In case of a right answer over the standard time, reexamination at the same visual acuity grade is executed twice at the most. If a right answer is given at least once, examination at a higher visual acuity grade is executed. In case of a wrong answer within the standard time at a first presentation of optotype, reexamination at the same visual acuity is executed only once. If the right answer is given at this reexamination, examination at a higher visual acuity grade is executed. Reexamination is thus executed, so that the result of the examination is correct. In addition, the examination time can be shortened since necessary number of times of reexaminations is minimum.

An interface for allowing communication between an auto-phoropter and a computer with visual acuity testing software. An adjustable filter for a computer monitor used with a computer with visual acuity testing software.

An aberrometer is provided for automatically measuring a human eye aberration, determining a subjective visual acuity associated with the selection of a best spherocylindrical correction, and investigating the influence of high orders aberrations on the visual acuity. The aberrometer includes a point light source which is projected on the eye retina, scattered back by the retina, and passes through the eye optical systems acquiring a phase modulation corresponding to the total eye optical aberration. The aberrometer also includes a wave front sensor whose output signal is transmitted to a device control system, an aberration compensation system which is disposed between the human eye and the wave front sensor and through which radiation coming out from the eye and projected on the eye retina passes, and a test picture projector which projects the test picture image on the eye retina through the aberration compensation system.

The invention provides a dynamic visual acuity testing system. The system can be used for performing dynamic visual acuity testing on movement of a sighting mark in eight directions, and the qualification degree of a driver on a specific task can be truly reflected. The system comprises a sighting mark movement unit, a result feedback unit and a testing data processing unit, wherein the sighting mark movement unit enables a sighting mark to make uniform linear motion on a display screen according to designated directions including upper, right upper, right, right lower, lower, left lower, left and left upper directions, the size of the sighting mark has 1.6-0.1 levels, one level is arranged every 0.1, and only one level size is arranged in each sighting mark living duration, and the sighting mark starts to move according to the sequence from 1.6 level to 0.1 level, and is stopped moving when a signal of the result feedback unit is received; the result feedback unit is used for receiving the judging result of a tested person in the opening direction of the sighting mark, and transmitting the result to the testing data processing unit; the testing data processing unit is used for comparing the judging result of the result feedback unit with the actual opening direction of the sighting mark to provide a comparison result. The invention further provides a method adopting the system.

When a Landolt ring optotype is presented in a visual acuity testing unit, an examinee answers a position of a slit of the optotype through an operation of a joystick lever or the like. If an examinee gives a right answer within a standard time at a first presentation of optotype, examination at a higher visual acuity grade is executed by presenting a smaller Landolt ring optotype. In case of a right answer over the standard time, reexamination at the same visual acuity grade is executed twice at the most. If a right answer is given at least once, examination at a higher visual acuity grade is executed. In case of a wrong answer within the standard time at a first presentation of optotype, reexamination at the same visual acuity is executed only once. If the right answer is given at this reexamination, examination at a higher visual acuity grade is executed. Reexamination is thus executed, so that the result of the examination is correct. In addition, the examination time can be shortened since necessary number of times of reexaminations is minimum.

A visual acuity examination is performed on a patient by bringing a confocal imaging apparatus up to a patient's eye. Stimuli at various points in the patient's field of view are generated while the patient fixates on a point. The patient's responses to the stimuli are recorded with the movement of the eye with is tracked with the aid of the confocal imaging apparatus. The position of said stimuli on the retina is corrected to take into account any movement of the eye between stimuli.

An eyesight testing apparatus examines associated heterophoria of the eyes of a subject. The apparatus includes an image generation device having a display unit for generating test patterns for display to the eyes. An optical, assembly is arranged on that side of the display unit facing the eyes. This assembly separates light supplied by a first group of selected zones of the display unit from light supplied to a beam path by a second group of selected zones of the display unit. The left eye only receives the light from the first group. The light from the second group only passes to the right eye. The optical assembly includes a prism matrix having a multiplicity of prism portions extending in the vertical direction and each having a lens-shaped region with a convex surface facing the display unit.

A subjective vision tester includes a pair of right and left lens chamber units (2) each having a test window (4), a first lens disk (11-14) provided with an aperture and a plurality of optical elements (110, 120, 130, 140) and placed in a position closer to an examinee's eye (E) within the each lens chamber unit, and a second lens disk (15, 16) provided with an aperture (151, 161) and a plurality of optical elements (150, 160) and placed in a position farther from the examinee's eye than the first lens disk within the lens chamber unit. The first lens disk and the second lens disk are equal in diameter. The diameter of the diameter of the aperture in the second lens disk is larger than each optical element in the first lens disk.

A visual acuity testing apparatus includes a target presenting unit for displaying various targets to be presented to a subject's eye, an optical element arranging device for retaining various optical elements, and selectively arranging the optical element corresponding to a response from the subject between the subject's eye and the target presenting unit, an operation section which is operated for selecting each of targets and each of the optical elements, a display section for displaying an operation image illustrating an operation content of the operation section, a memory for storing a plurality of target data illustrating each of the targets and operation image data illustrating the operation image, an arithmetic control section for extracting the target data and the operation image data from the memory according to an operation of the operation section, and an image output section having at least two output ports.

A method of making a shelter spectacle for existing spectacles through a public network, includes the steps of gathering dimensional information on the existing spectacles worn by a user; sending the dimensional information on the existing spectacles to a fulfillment center through the public network; according to the dimensional information sent by the user, producing a shelter spectacles which fit the existing spectacles worn by the user; and sending the shelter spectacles back to the user.

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 provides an eyesight testing instrument. The eyesight testing instrument comprises an eyepiece sleeve, a rotary cylinder and an objective lens sleeve and is characterized in that an eyepiece lens is arranged in the eyepiece sleeve, an objective lens is arranged in the objective lens sleeve, a first plane mirror and a second plane mirror are arranged in the rotary cylinder, the first plane mirror is arranged on the eyepiece sleeve side, the second plane mirror is arranged on the objective lens sleeve side, the lower end of the eyepiece sleeve is rotatably connected with the upper end of the rotary cylinder in a threaded manner, and the upper end of the objective lens sleeve is rotatably connected with the lower end of the rotary cylinder in a threaded manner. The eyesight testing instrument has the advantages that by combining mini lenses with a smartphone application, a user can accurately test the eyesight of himself or herself and can well protect the eyes, eyesight tests are performed by a fun method, and the eyesight testing instrument is convenient to use, small in size, complete in function, capable of being carried about and capable of performing self-tests anytime and anywhere.

The invention provides a method for regulating the sighting mark moving speed in a dynamic visual acuity testing system. By adopting the method, the sighting mark moving speed can be arbitrarily regulated, and the qualification degree of a driver on a specific task can be truly reflected. The method comprises the following steps: (1) starting; (2) acquiring a sighting mark moving speed v; (3) acquiring the distance d between a tested person and the sighting mark; (4) calculating a sighting mark actual moving speed v1 according to a formula (1); (5) acquiring a single pixel width s and a sighting mark generation frequency f of a display screen; (6) calculating a pixel per inch u of a sighting mark in the adjacent frame moving on the display screen according to a formula (2); and (7) finishing.

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 relates to a virtual eyepiece device for monitoring eyeball movement. The virtual eyepiece device comprises an eyepiece frame which is internally provided with a lens assembly, two human eye testing areas, a micro display, a camera assembly and a data transmission assembly; the lens assembly is composed of two lens sets which are arranged in a left and right mode; the micro display is located at the back of the lens assembly, and the human eye testing areas are correspondingly arranged in front of the lens assembly in a left and right mode; the camera assembly comprises two camera components which face the two human eye testing areas respectively; the data transmission assembly connects the micro display and the camera assembly with a computer respectively. According to the virtual eyepiece device, by mean of combination of a virtual imaging eyepiece and computer software, interference of the outside world to the testing process is reduced, dynamic visual acuity testing is standardized, reliable eyeball movement feature data can be obtained, and a scientific basis is provided for subsequent dynamic visual acuity feature evaluation.

The invention relates to a virtual eyepiece device for monitoring eyeball movement. The virtual eyepiece device comprises an eyepiece frame which is internally provided with a lens assembly, two human eye testing areas, a micro display, a camera assembly and a data transmission assembly; the lens assembly is composed of two lens sets which are arranged in a left and right mode; the micro display is located at the back of the lens assembly, and the human eye testing areas are correspondingly arranged in front of the lens assembly in a left and right mode; the camera assembly comprises two camera components which face the two human eye testing areas respectively; the data transmission assembly connects the micro display and the camera assembly with a computer respectively. According to the virtual eyepiece device, by mean of combination of a virtual imaging eyepiece and computer software, interference of the outside world to the testing process is reduced, dynamic visual acuity testing is standardized, reliable eyeball movement feature data can be obtained, and a scientific basis is provided for subsequent dynamic visual acuity feature evaluation.

The invention relates to an automatic regulation vision examination device for the ophtalmology department, and belongs to the technical field of medical instruments. The automatic regulation vision examination device for the ophtalmology department comprises an information processor main body, wherein a display table is arranged on the upper side of the information processor main body; an imaging tube is arranged on the display table; a control panel is arranged on the front side of the display table; a main power button disk is arranged on the upper side of the control panel; a main power button is arranged on the main power button disk; an instrument power regulation knob disk is arranged on the right side of the main power button disk; an instrument power regulation knob is arranged on the instrument power regulation knob disk; a patient seat connection plate is arranged on the right side of the information processor main body; a patient seat bracket is arranged on the upper side of the patient seat connection plate; and a patient seat is arranged on the upper side of the patient seat bracket. The automatic regulation vision examination device is complete in function and convenient to use, and is safe and efficient when used for testing vision of a patient, so that the workload of medical staff is relieved.

Embodiments of the invention are directed towards systems, methods and computer program products for providing improved eye tests. Such tests improve upon current eye tests, such as visual acuity tests, by incorporating virtual reality, software mediated guidance to the patient or practitioner such that more accurate results of the eye tests are obtained. Furthermore, through the use of one or more trained machine learning or predictive analytic systems, multiple signals obtained from sensors of a testing apparatus are evaluated to ensure that the eye test results are less error-prone and provide a more consistent evaluation of a user's vision status. As it will be appreciated, such error reduction and user guidance systems represent technological improvements in eye tests and utilize non-routine and non-conventional approaches to the improvement and reliability of eye tests.

The invention provides a visual acuity chart vision calibration method and system. The method comprises the steps that the edge width value of an E-character myopia symbol in a visual acuity chart tobe calibrated is obtained, and a corresponding test vision value is calculated according to the edge width value; international standard calculation is conducted on the test vision value to obtain aninternational standard vision value, and national standard calculation is conducted on the international standard vision value to obtain a national standard vision value; diopter calculation is conducted on the test vision value to obtain a diopter value; and eyeglass lens power calculation is conducted on the test vision value to obtain an eyeglass lens power value; according to a preset markingrule, the corresponding E-character myopia symbol is calibrated according to the eyeglass lens power value, the diopter value, the national standard vision value, the international standard vision value and the test vision value which are obtained through testing. Accordingly, calibration of the eyeglass lens power value, the diopter value, the national standard vision value, the international standard vision value and the test vision value can be conducted on the visual acuity chart to be calibrated, and when a user conducts a vision test, conversion through professionals is not needed.

Disclosed is a centesimal visual acuity chart. The centesimal visual acuity chart is characterized in that a centesimal system is adopted to express visual acuity, so that the better the visual acuity is, the higher the score. Each visual target of the visual acuity chart is in the shape of a notched ring, a notch is fan-shaped, a circle center angle is 12.76 degrees, width of the ring is equal to that of the middle of the notch, outer diameter of the ring is 10 times of width of the ring while inner diameter of the same is 8 times of width of the ring, size of the visual targets is in continuous gradient changing, and a vision score difference of each gradient is 10 scores.100 scores is for a test of 5 m, the width of the middle of the notch is 1.454 mm, the visual target of 100 scores is taken as a base point, the size of the visual targets of 90 scores and lower scores is sequentially increased progressively outward by 1.25 times, and the size of the visual targets of 110 scores and higher scores is sequentially decreased progressively inward by 0.8 time. The visual targets can sleeved and overlapped at intervals according to size order to form four groups to be combined into the visual acuity chart, and size of the visual acuity chart is reduced. The visual acuity chart can be made into an electronic product, namely a visual acuity tester, by using a led semitic form to increase interestingness when visual acuity of children is tested.

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.

A system for replicating a standardized visual acuity test, such as the 20′ Snellen test may comprise a binocular viewer attached to a smartphone. A binocular viewer may comprise a housing comprising a pair tube covers having voids allowing for viewing through a pair of lens tubes with each lens tube in visual communication with a second lens a first lens an aperture and a front cover. The optical systems use an artful combination of front and back lens surfaces, demagnification and other systems to faithfully replicate the sight lines perceived by a user of a traditional 20′ test. The system also allows for the incorporation of other tests conducted with both eyes including Color Sensitivity and Contrast, furthermore by placing a deformable, tunable lens between the second lens and the eye the device serves as an ophthalmic refractometer, allowing a Spherical Equivalent refraction estimate for each eye.

The invention discloses an automatic eyesight testing device, which comprises a testing emitter and a testing receiver. The testing emitter comprises a first single-chip microcomputer, a first key, asecond key, a third key, a fourth key and an infrared emission circuit. The testing receiver comprises an infrared receiving circuit, a comparator, a counter, a second single-chip microcomputer, a first indicator light, a second indicator light, a third indicator light, a fourth indicator light, a character display screen and a result display screen. The automatic eyesight testing device has advantages that by an infrared wireless signal transmitting technique and a single-chip microcomputer control technique, a person taking eyesight test can complete the eyesight test independently, convenience and quickness in operation and result accuracy are realized, and results can be displayed on a display screen.

The invention discloses an automatic assessment system for a visual cognition behavior function of a rodent. The automatic assessment system comprises a shape sensory ability testing unit, a visual acuity testing unit and a photoreception ability testing unit, wherein the adjacent units are mutually engaged through a transition chamber respectively; the shape sensory ability testing unit is composed of at least three channels which are arranged side by side and are different in inlet shapes; the visual acuity testing unit is composed of a chamber body and a plurality of clapboards, the chamber body is provided with an inlet and an outlet, the plurality of clapboards are arranged in the chamber body at interval, the bottoms of the adjacent clapboards are staggered and provided with passageways, and each clapboard, side walls and floor are printed with texture patterns with different spatial resolutions respectively; and the photoreception ability testing unit is composed of at least three channels which are arranged side by side and are different in lumen illuminance. The automatic assessment system disclosed by the invention has the advantages that a set of complete test system which has no adverse influences on experimental animals is designed to realize the reliable assessment of the visual cognition behavior function of the rodent so as to establish complete and reliable assessment indexes.