33 results about "Hyperacuity" patented technology

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.

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.

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.

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 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.

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.

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 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.

Provided herein are devices, systems, methods, apparatuses, and computer program products for determining a visual acuity of a reader. The device includes a display adapted to present a first line of text to the reader and an input device adapted to receive signals corresponding to the first line of text. The device further includes a processor that is adapted to determine a reading score associated with the first line of text, generate an acuity parameter based on the reading score and the first readability vector, and determine the visual acuity of the reader based on the acuity parameter and a reference acuity parameter.

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.