33 results about "Hyperacuity" patented technology

A method of measuring eye refraction to achieve desired quality according to a selected vision characteristics comprising the steps of selecting a characteristic of vision to correlate to the desired quality of vision from a group of vision characteristics comprising acuity, Strehl ratio, contrast sensitivity, night vision, day vision, and depth of focus, dynamic refraction over a period of time during focus accommodation, and dynamic refraction over a period of time during pupil constriction and dilation; using wavefront aberration measurements to objectively measure the state of the eye refraction that defines the desired vision characteristic; and expressing the measured state of refraction with a mathematical function to enable correction of the pre-selected vision characteristic to achieve the desired quality of vision. The mathematical function of expression may be a Zernike polynomial having both second order and higher order terms or a function determined by spline mathematical calculations. The pre-selected desired vision characteristics may be determined using ray tracing technology.

An augmented reality head worn device comprising a curve combiner transparent to visible light and reflective in an selected infrared frequency range, a scanning light source defining a field of view, a holographic optical element adapted to provide pupil expansion to create an eye-box, and at least one projection system for providing high acuity at or near a center of the field of view.

A system for projecting one or more synthetic optical images, which demonstrates improved resistance to optically degrading external effects, is provided. The inventive system serves to lock the focal length of the focusing elements in place. In other words, no other transparent materials or layers brought into contact with the inventive system will serve to materially alter the focal length or the optical acuity of synthetic images formed by the system.

Eye refraction is measured to achieve desired quality via a selected vision characteristics. A characteristic of vision is selected to correlate to the desired quality of vision from a group of vision characteristics comprising acuity, Strehl ratio, contrast sensitivity, night vision, day vision, and depth of focus, dynamic refraction over a period of time during focus accommodation, and dynamic refraction over a period of time during pupil constriction and dilation. Wavefront aberration measurements are used to objectively measure the state of the eye refraction that defines the desired vision characteristic. The measured state of refraction is expressed with a mathematical function enabling correction of the pre-selected vision characteristic to achieve the desired quality of vision. The mathematical expression function may be a Zernike polynomial having both second order and higher order terms or a function determined by spline mathematical calculations. Pre-selected vision characteristics may be determined using ray tracing technology.

Systems and methods for providing a video game to map macular visual acuity comprising a test where a fixation point is ensured by brief simultaneous presentation of central and pericentral targets. The game may be implemented on a hardware platform including a video display, a user input device, and a video camera. The camera is used to monitor ambient light level and the distance between the device and the eyes of the test subject. The game serves as a macular acuity perimeter that produces a map of the acuity of an eye that may be compared with normative data. The type of acuity tested is preferably Vernier acuity, but resolution acuity can also be tested. The test results are transmitted to a health care professional by telecommunications means to facilitate the diagnosis or monitoring of age-related macular degeneration or other relevant eye diseases.

A viewing target for a visual acuity and refraction measurement includes at least one line comprising a width dimension that is below a resolution limit width (hereinafter “RLW”) of a test subject visual acuity, and an adjustable length dimension that is initially set at greater than the RLW of the test subject visual acuity. A base, at least approximately intersecting the line, has a thickness along the direction of the length of the line that is greater than the RLW of the test subject visual acuity. The length dimension of the line is adjustable in increments small enough to effectively approximate the visual acuity of the test subject by determining a shortest resolvable line and a next smaller line that is not resolvable by the test subject.

A viewing target for a visual acuity and refraction measurement includes at least one line comprising a width dimension that is below a resolution limit width (hereinafter “RLW”) of a test subject visual acuity, and an adjustable length dimension that is initially set at greater than the RLW of the test subject visual acuity. A base, at least approximately intersecting the line, has a thickness along the direction of the length of the line that is greater than the RLW of the test subject visual acuity. The length dimension of the line is adjustable in increments small enough to effectively approximate the visual acuity of the test subject by determining a shortest resolvable line and a next smaller line that is not resolvable by the test subject.

Systems and methods for providing a video game to map macular visual acuity comprising a test where a fixation point is ensured by brief simultaneous presentation of central and pericentral targets. The game may be implemented on a hardware platform including a video display, a user input device, and a video camera. The camera is used to monitor ambient light level and the distance between the device and the eyes of the test subject. The game serves as a macular acuity perimeter that produces a map of the acuity of an eye that may be compared with normative data. The type of acuity tested is preferably Vernier acuity, but resolution acuity can also be tested. The test results are transmitted to a health care professional by telecommunications means to facilitate the diagnosis or monitoring of age-related macular degeneration or other relevant eye diseases.

The invention provides an advantageous system and corresponding method for measuring a plurality of aspects of vision. It is a computer-implemented, user-interactive system which can be used by practitioners such as opticians to measure and assess a patient's visual acuity. It comprises a handheld computing device arranged and configured to present at least one optotype to a user (patient) within a gamified environment. This aspect of the invention provides the advantage that it is more easily used by certain types of patients, such as children, the elderly or those suffering from medical / clinical conditions who would typically struggle to use traditional measuring tools. In a preferred embodiment, the optotype has at least one characteristic selected to facilitate the measurement of at least one, or preferably at least two, aspects of visual function; and the invention is arranged to detect the user's response to the optotype to provide a measurement of at least one or at least two aspects of visual function. Advantageously, this can be achieved in one ‘sitting’. The plurality of aspects of visual function can include visual acuity, central visual field, contrast sensitivity, stereopsis and / or colour vision, detection acuity of vision, resolution acuity of vision (spatial resolution or identification of static of dynamic directionality), recognition acuity of vision, hyperacuity of vision, temporal acuity of vision, spectral acuity of vision. The at least one optotype is repeatedly presented to the user, and the at least one characteristic is altered upon each repetition. The repetition may continue until a threshold or limit is reached. The at least one characteristic relates to the level of detail, contrast, colour, position or movement of the at least one optotype.

In one aspect, the present invention provides a method for correcting vision that employs two lenses, at least one of which is a multifocal lens, with different focusing characteristics for use in the two eyes of the patient. The visual performance of each lens (e.g., visual contrast or acuity) is selected in accordance with a predefined relation so as to optimize the binocular visual performance provided by the combination of the lenses.

The invention provides an advantageous system and corresponding method for measuring a plurality of aspects of vision. It is a computer-implemented, user-interactive system which can be used by practitioners such as opticians to measure and assess a patient's visual acuity. It comprises a handheld computing device arranged and configured to present at least one optotype to a user (patient) within a gamified environment. This aspect of the invention provides the advantage that it is more easily used by certain types of patients, such as children, the elderly or those suffering from medical / clinical conditions who would typically struggle to use traditional measuring tools. In a preferred embodiment, the optotype has at least one characteristic selected to facilitate the measurement of at least one, or preferably at least two, aspects of visual function; and the invention is arranged to detect the user's response to the optotype to provide a measurement of at least one or at least two aspects of visual function. Advantageously, this can be achieved in one ‘sitting’. The plurality of aspects of visual function can include visual acuity, central visual field, contrast sensitivity, stereopsis and / or colour vision, detection acuity of vision, resolution acuity of vision (spatial resolution or identification of static of dynamic directionality), recognition acuity of vision, hyperacuity of vision, temporal acuity of vision, spectral acuity of vision. The at least one optotype is repeatedly presented to the user, and the at least one characteristic is altered upon each repetition. The repetition may continue until a threshold or limit is reached. The at least one characteristic relates to the level of detail, contrast, colour, position or movement of the at least one optotype.

The invention relates to a novel recreational or occupational modulating light headlamp which works in conjunction with the mechanics of human vision to provide effective path lighting in very low light or dark. Applying flicker fusion rate and factoring in the acuity of the eye's rods and cones, lighting is applied to the range and capability of the ocular abilities and optimized for low light or dark.

A method for generating a visual acuity metric, based on wavefront aberrations (WFAs), associated with a test subject and representing classes of imperfections, such as defocus, astigmatism, coma and spherical aberrations, of the subject's visual system. The metric allows choices of different image template, can predict acuity for different target probabilities, can incorporate different and possibly subject-specific neural transfer functions, can predict acuity for different subject templates, and incorporates a model of the optotype identification task.

The invention relates to a Parkinson's disease patient gait freezing symptom rehabilitation training system. The rehabilitation training system comprises an information acquisition module, which is used for acquiring electroencephalogram information and motion state information of a patient and sending the electroencephalogram information and the motion state information to the control module; thecontrol module is used for analyzing the electroencephalogram information and the motion state information and judging whether the patient is in a gait frozen state or not; if the patient is in the gait frozen state, visual prompt information and / or auditory prompt information can be generated, and the visual prompt information and / or auditory prompt information can be sent to a sensory prompt module; and the sensory prompt module is used for outputting visual prompt information and / or auditory prompt information. According to the invention, the patient is reminded through the visual prompt information and / or the auditory prompt information, the gait freezing state of the patient is relieved, due to non-continuous prompting of the prompting information, prompting is conducted only when the patient is in the gait freezing state, the sensitivity of the patient to the prompting information can be kept, the situation that the patient fails due to sensory fatigue of the patient to continuous prompting information is avoided, and the prompting failure probability is reduced.

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.

A method for administering a low luminance dysfunction vision test by displaying, a first character at a first acuity level on a display at a first luminance level, receiving an input signal from the patient indicating whether the patient recognizes the first character, displaying a second character at a second acuity level and the first luminance level, receiving a second input signal from the patient indicating whether the patient recognizes the second character, calculating a first score, displaying a third character at a third acuity level and a second luminance level, which luminance level replicates a specific low luminance real environmental condition, receiving a third input signal from the patient indicating whether the patient recognizes the third character, displaying a fourth character at a fourth acuity level and the second luminance level, receiving a fourth input signal from the patient indicating whether the patient recognizes the fourth character, calculating a second score and calculating a third score.

The methods and systems disclosed herein generally relate to systems and methods for predicting future visual acuity of a subject by using a machine learning model. An image of at least a portion of a retina of a subject may be processed by one or more first machine learning models to detect a set of retina-related segments. A segment-specific metric that characterizes a retinal-related segment of the set of retinal-related segments may be generated. The segment-specific metrics may be processed by using a second machine learning model to generate results corresponding to predictions that correspond to future visual acuity of the subject.

The invention relates to the technical field of computers, and provides a video processing method and terminal equipment. The method comprises the following steps: acquiring a network bandwidth; receiving first video data and second video data of a target video determined according to the network broadband, wherein the resolution of the first video data is greater than that of the second video data; and combining the video frame image in the first video data with the video frame image in the second video data according to playing time to generate third video data. According to the method, by utilizing the visual characteristic that the sensitivity of human eyes to the dynamic video is not high is utilized, the high-resolution video and the low-resolution video are recombined, the combinedvideo can achieve the watching effect of the high-resolution video, and under the condition that the network bandwidth is not good, the video playing fluency can be guaranteed, and the visual video watching effect is improved.

The invention discloses an electroencephalogram signal-based visual acuity evaluation system and a method thereof. The system evaluates visual acuity by using electroencephalogram signals to obtain more objective and accurate evaluation results. VR glasses are used to effectively reduce influence from external ambient light. Sighting marks are automatically switched according to the effective signal duration, thereby achieving automation of sighting mark switching and synchronization of the sighting marks and the signals. Therefore, the single-electrode electroencephalogram signal acquisition device is more simple in operation and lower in cost. A signal processing module is used for processing background signals so as to reduce influence of individual difference and environment change on evaluation results, and allow the system to be applied in examination of daily visual acuity. After a data analysis module obtains visual acuity results through the first evaluation, the abnormal results are eliminated by calculating the relative standard deviation followed by the secondary evaluation, so that the evaluation results are more accurate. The data analysis module collects each of analysis results to back to a database, thereby perfecting eyesight judgment method with electroencephalogram signals, and improving judgment accuracy in the next examination.

A method for sharpening an input digital image captured using a digital camera having a zoom lens, determining a parameterized representation of lens acuity of the zoom lens as a function of at least the lens focal length and lens F# by fitting a parameterized function to lens acuity data for the zoom lens at a plurality of lens focal length and lens F / #; using a processor to sharpen the input digital image responsive to the particular lens focal length and lens F / #corresponding to the input digital image using the parameterized representation of the lens acuity.

Embodiments provide camera designs (e.g., eyeball cameras) that mimic the human eye in terms of geometry, optical performance, and / or motion. The eyeball camera employs the same cornea and pupil geometry as the human eye and has an iris and pupil configured with multiple texture, color, or diameter options. The resolution of the eyeball camera is designed to match the sensitivity of typical 20 / 20 human vision, and the focal length is adjusted from 0 to 4 diopters. A pair of eyeball cameras are independently mounted on the two hexapod frames to simulate gaze and convergence of human eyes. Perceptual virtual and real worlds are calibrated and evaluated based on eye conditions such as pupil position and gaze using an eyeball camera. The eyeball camera acts as a bridge, combining data from spatial calculations (such as eye tracking, 3D geometry of the digital world, display color accuracy / uniformity, and display optical quality (clarity, contrast, etc.

The present invention relates to reducing power consumption of mobile devices through dynamic resolution scaling. A computing device may dynamically adjust pixel density based at least in part on a viewing distance between a user of the computing device and a display. In some examples, viewing distance may be determined using low power acoustic (eg, ultrasound) sensing. The pixel density used to display content may be determined using an algorithm based on viewing distance and the user's visual acuity. The content to be displayed on the computing device may be sent to a processor of the computing device for graphics processing. In some examples, the content may be truncated prior to processing (such as by using a hook process) and scaled based on the determined pixel density. By shrinking the pixel density of the content, the amount of system resources required to process the content may be less, which in turn may result in less power consumption of the processor to perform graphics processing operations, thereby extending the battery life of the computing device.

A device using holographic 4D plenoptic capture and display technologies is used to generate a light field function to provide glasses-less vision correction for observers with imperfect vision, and to project an image according to the generated light field function, and methods for calibrating a four-dimensional light field for a user with an uncorrected visual acuity.

A backlight device (10) for a display screen (1) comprises a first light source (12) adapted to emit light having a peak wavelength between 600 and 630 nm; a second light source (14) adapted to emit light having a peak wavelength between 510 and 530 nm and a third light source (16) adapted to emit light having a peak wavelength between 440 and 460 nm. The spectral power distribution of the backlight results in an enhanced visual acuity and color perception by better segregating the emission peaks (113, 115, 117) of the light sources and arranging their peak wavelengths at values which particularly suit the spectral sensitivity of the eye. Not only is the perceived resolution of the display screen increased but also the perceived brightness is improved allowing energy savings to be made.

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 progressive ophthalmic lens adapted to a wearer in given wearing conditions having an addition and fulfilling an acuity performance criterion determined by: - defining a set of at least three different vision distances comprise at least a first vision distance greater than or equal to 4 m, a second vision distance greater than or equal to 0.6 m and smaller than or equal to 2 m and a third vision distance smaller than or equal to 0.5 m, each vision distance being associated with an acuity loss threshold value and an acuity area threshold value, providing an acuity model defining acuity loss as a function of lens power and resulting astigmatism, determining of each vision distance using the acuity model the area of gaze directions for which the acuity loss is below the associated acuity loss threshold value, the acuity performance criterion being fulfilled if for each vision distance of the set of at least three vision distances, the area of gaze directions for which the acuity loss is below the associated acuity loss threshold value is greater than or equal to the acuity area threshold value corresponding to said distance.

The invention provides a method, a system and a device for measuring visual acuity of a client in clinical visual acuity measurements. In accordance with the implementation, the system comprises a display device (41), an input device (42) and a computing device (43). The display device (41) is capable of displaying sets of symbols in different size to the client. The input device (42) is capable of receiving responses of the client indicative to the identity of the symbols, and the computing device (43) is capable of a) registering (S431) values to the responses belonging to pre-calculated values of similarity of the symbols, b) calculating (S432) a rate of recognition value for each symbol size, and c) determining (S433) the measured visual acuity from the rate of recognition values.

The invention provides a VR Lens stray light noise detection and calculation method. The method comprises the following steps: S1, acquiring an image; S2, processing the image, and capturing stray light noise; and S3, partitioning the area where the stray light noise is located, calculating the area of each partition, and determining the numerical value of the stray light noise according to the area. In the prior art, the VR Lens detection mainly depends on a visual inspection mode, glasses need to be close to a product during detection, each visual inspection only focuses on the detection of the Lens on one side of the VR product, the efficiency is low, an operator is easily tired, and the vision may be influenced for a long time; the sensitivity and quality control ability of personnel are different, a high detection rate is difficult to guarantee, Lens cannot be partitioned, the bad layer degree cannot be accurately judged, and the detection process cannot be traced. According to the invention, intelligent detection of VR Lens is realized through effective analysis of VR images and capture of stray light noise.