33 results about "Near visual acuity" patented technology

A system and method for treating and preventing loss of visual acuity. The system comprises a vision correcting lens, such as a contact lens, having a material with a regular pattern of orientation of polarizable molecular bonds, so as to create a birefringent effect. Off-axis light rays are refracted through the contact lens so as to focus in front of the retina, whereas on-axis light rays pass through the contact lens without refraction, such that their focal point on the fovea is unaltered. In an exemplary embodiment, a contact lens of the present invention is capable of independently altering the refractive state of the eye in relation to fovea and peripheral retina so as to simultaneously correcting visual acuity while minimizing the signal for axial growth and hence myopic progression.

A system and method for treating and preventing loss of visual acuity. The system comprises a vision correcting lens, such as a contact lens, having a material with a regular pattern of orientation of polarizable molecular bonds, so as to create a birefringent effect. Off-axis light rays are refracted through the contact lens so as to focus in front of the retina, whereas on-axis light rays pass through the contact lens without refraction, such that their focal point on the fovea is unaltered. In an exemplary embodiment, a contact lens of the present invention is capable of independently altering the refractive state of the eye in relation to fovea and peripheral retina so as to simultaneously correcting visual acuity while minimizing the signal for axial growth and hence myopic progression.

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.

A method to generate an output image that improves observation of a target image viewed on a medium by an optical system is disclosed. The method includes receiving at least one target image by a processing system, receiving at least one parameter by the processing system, defining an error signal associated with the difference between calculated optical system observation of intermediate images and the at least one target image, minimizing the error signal, and generating an output image associated with the intermediate image having the minimized error.

The invention discloses a sclera lens with an open window and a concave bag. One open window or a plurality of annularly distributed open windows is / are arranged in an optical area of the sclera lens; two or more concave bags are arranged in the concave bag ring area on the rear surface of the optical area, and the concave bags are used for capturing bubbles near the window; wherein the open window is located radially outward of the concave bag annulus region and is not located in a transition region of the sclera lens, the transition region being configured to be located above an angular sclera edge of the eye when worn. The lens disclosed by the invention cannot be adsorbed to the cornea, can be comfortably worn within 12 hours and can maintain clear visual acuity.

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.

The invention discloses an eagle eye midbrain loop return inhibition mechanism-imitated unmanned target drone target detection method, which comprises the following steps of: 1, calibrating a camera,acquiring internal and external parameters of the camera, and correcting image distortion; 2, carrying out the illumination processing of imitating the color constancy of the beasts, and recovering the color information of the image under the normal illumination; 3, preprocessing an eagle midbrain opening and closing corresponding mechanism-imitated image; 4, extracting a salient region based on an eagle visual sensitivity function; and step 5, carrying out target output based on an eagle brain return inhibition mechanism. The method has the advantages that 1, an eagle eye biological image processing mechanism is used for reference, and an eagle midbrain loop return inhibition target detection framework is extracted and applied to small target detection of an unmanned target drone; 2, themethod can adapt to the small target detection problem of the target drone in various environments, the influence of external factors such as illumination and contrast is eliminated, and the algorithmadaptability is improved; and 3, the method is simple in framework, the target detection calculation amount is saved, and the airborne calculation load requirement is greatly reduced.

The invention relates to an objective, rapid and accurate visual acuityinspection system based on steady-state visual evoked potential, which comprises a stimulation normal form design module, an SSVEP signal acquisition, processing and feature recognition module, a spatial frequency gradient presentation module based on maximum likelihood estimation and a visual acuity judgment and feedback module. The gratings, checkerboard grids or concentric rings are used as visual stimulus paradigms, parameters such as time frequency and the like are preset, stimulation normal form spatial frequency parameters of each test are adaptively set through a maximum likelihood method according to a psychophysics visual acuity measurement function, so that accurate evaluation of visual acuity is completed within a short test time, and objective, rapid and accurate examination is provided for visual acuity in ophthalmic examination.

The invention discloses a method for determining the horizontal evacuation speed of old people in an evacuation model. The method comprises the following steps: acquiring basic characteristics of oldpeople, wherein the basic characteristics comprise visual acuity VA, sight line level height, evacuation speed V0 in a smokeless environment and minimum evacuation speed Vmin; determining an extinction coefficient Kc0 when the evacuation speed of the elderly begins to drop; determining an extinction coefficient Kc1 when the evacuation speed of the old people is reduced to the minimum value; carrying out fire simulation on a building needing fire evacuation simulation through PyroSim software to obtain an extinction coefficient of the sight line horizontal height H of the elderly at any momentof the building, and recording the extinction coefficient as Kc; comparing the Kc, the Kc0 and the Kc1, and then determining the horizontal evacuation speed V of the old people according to a formula.The horizontal evacuation speed, determined by the method, of the elderly in the fire is closer to the real evacuation speed of the elderly, and a scientific basis can be provided for escape management of elderly groups and making of emergency evacuation plans.

The Mobile Screening and Utility Unit (MSUU) serves as an additional, exposure-reducing, enclosed barrier for screeners. The MSUU reduces contracting any virus such as COVID-19 by person-to-person contact or aerosol means from symptomatic or asymptomatic patients while the screener is inside the unit. Key features are: reusable, wheel-based (used in / outside), and sanitized / disinfected using methods endorsed by the Centers for Disease Control and Prevention (thus reducing the need for expensive PPE). The unit front has a clear / transparent pane for visual acuity and two protective sleeves and pouch. The screener enters the unit from the rear, zips it shut, then moves forward to insert his or her arms through the sleeves and look through the pane. Screening is performed with minimal to no exposure to the screener. The screener can easily communicate without the use of additional audio equipment. Seated configurations are available that can be used with or without tables.

The invention discloses a visual assistance method for people with visual dysfunction. The method comprises the following steps: S1, providing AR glasses based on planar waveguide imaging; s2, detecting eye function parameters, including central visual acuity, contrast sensitivity, fusion function and stereoscopic vision, of a wearer by using AR glasses imaging; s3, the camera system tracks an observation target of the wearer, shooting is carried out after accurate positioning, and a target image is obtained; s4, performing optical amplification and background digital amplification on the obtained digital image information, performing feature enhancement according to the functional parameters of the eyes of the wearer, and outputting imaging light; and S5, imaging the imaging light in the retina of the wearer after the imaging light passes through the planar waveguide. Correspondingly, the invention further discloses a visual assistance system for people with visual dysfunction and the intelligent AR glasses. According to the invention, people with visual dysfunction can be helped to recover normal life, work and study, necessary scientific rehabilitation training can be carried out, and patients can be helped to develop and effectively use residual vision.

An electronic device may have a display and a camera. Control circuitry in the device can gather information on a user's point of gaze using a gaze tracking system and other sensors, can gather information on the real-world image such as information on content, motion, and other image attributes by analyzing the real-world image, can gather user vision information such as user acuity, contrast sensitivity, field of view, and geometrical distortions, can gather user input such as user preferences and user mode selection commands, and can gather other input. Based on the point-of-gaze information and / or other gathered information, the control circuitry can display the real-world image and supplemental information on the display. The supplemental information can include augmentations such asicons, text labels, and other computer-generated text and graphics overlaid on the real world image and can include enhanced image content such as magnified portions of the real-world image.

Methods of improving visual endpoints related to retina-associated disease with CCR3 modulating agents are provided. An example of such an endpoint is visual acuity. Retina-associated diseases upon which visual acuity and other visual endpoints may be improved include retinopathy of prematurity, age-related macular degeneration, central retinal vein occlusion, and diabetic retinopathy.

An interactive fit tool and methodology which may be utilized by an eye care professional to improve the efficiency and final outcome in selecting a pair of contact lenses targeted towards a specific patient visual need in the treatment of presbyopia. The interactive fit tool comprises an application which includes images that would allow a patient to decide if he or she desires balanced visual acuity, near biased visual acuity, or distance biased visual acuity. In addition, the interactive fit tool comprises fit guide tables and performs the calculations for vertex distance and spherical equivalent.

Steady-state visual evoked potential-based visual acuity objective rapid and accurate inspection system, including stimulus paradigm design module, SSVEP signal acquisition, processing and feature recognition module, spatial frequency gradient presentation module based on maximum likelihood estimation, and visual acuity judgment and feedback The module uses gratings, checkerboard squares or concentric rings as the visual stimulus paradigm, and presets parameters such as time frequency, according to the psychophysical visual acuity measurement function, and adaptively sets the spatial frequency of the stimulus paradigm for each test through the maximum likelihood method Parameters, so that the accurate assessment of visual acuity can be completed in a short test time, providing an objective, fast and accurate inspection of visual acuity in eye examinations.

The invention discloses a visual prosthesis microelectrode array capable of generating converged virtual electrodes. The visual prosthesis microelectrode array comprises a microelectrode array, a common recovery electrode and a micro-current stimulator, wherein the micro-current stimulator stimulates adjacent ring electrodes in the microelectrode array according to a received external stimulationsignal; the microelectrode array is combined with the far-end common recovery electrode to generate virtual electrodes; the virtual electrodes move in a one-dimensional direction by adjusting the stimulation current proportion of two adjacent ring electrodes; and the virtual electrodes move in a two-dimensional region and converged virtual electrode stimulation is realized by adjusting the stimulation current proportion of four adjacent electrodes. According to the visual prosthesis microelectrode array, stimulation sites of the converged virtual electrodes can be adjusted, so that local virtual electrode stimulation of a retina is realized, the number of perception sites of a visual prosthesis implant is increased, and the perception visual sensitivity of the visual prosthesis implant isimproved. In addition, by disk electrodes, local physical electrode stimulation can further be realized, and the original physical electrode stimulation sites can be reserved while virtual electrode stimulation is carried out.

The invention relates to a virtual reality superspeed real-time rendering method, and the method comprises the steps: A, building environmental parameters to build an image model, carrying out the interactive control of a camera, enabling the near peripheral region and far peripheral region of a view field to be divided into three rendering regions with different resolutions, and enabling the built image model to generate a Perlin noise height field; B, carrying out the sampling through a projection grid, and building a virtual figure; C, obtaining the data of top points in the virtual figure; D, enabling the data of all top points to be mapped in a coordinate system; E, calculating texture coordinates; F, loading the texture coordinates; G, mixing various types of texture colors in all rendering regions, and completing the rendering. According to the invention, the method employs the rendering regions and distributes different resolution proportions to match with different visual sensitivity in the view field of a user, reduces the operation cost by several times, saves the operation resources and power of a computer, and achieves the real-time superspeed rendering. The method draws a water surface with a real effect through the pixel rendering and top point rendering.

The present invention provides a supplementary light device and a shooting system. The supplementary light device includes a first light-emitting structure, which is used to emit light in the supplementary light band when the first light-emitting structure is turned on, wherein the supplementary light band belongs to the first range , wherein, the relative visual acuity of the human eye corresponding to the wavelength in the first range is less than or equal to the first threshold, and the first threshold is less than 1; it also includes a first switch module, which is used for when the current ambient brightness is lower than the preset first threshold In the case of a brightness threshold, the first light emitting structure is controlled to be turned on. According to the present invention, since the first light-emitting structure is turned on by controlling the ambient brightness, and the relative visual acuity of the human eye corresponding to the light in the supplementary light band is less than or equal to the first threshold, the first threshold is less than 1, that is, the light in the supplementary light band is less than or equal to the first threshold. The sensitivity of the human eye is low, so it can solve the problem of how to supplement light in a low-brightness environment, and achieve the technical effect of effectively reducing the discomfort caused by the supplementary light system to the human body and the light pollution to the environment.

The invention discloses a scleral lens with a fenestration and a concave pocket. The optical zone of the scleral lens is provided with one fenestration or a plurality of circularly distributed fenestrations; the concave pocket ring on the rear surface of the optical zone Two or more pockets are set in the area, and the pockets are used to capture air bubbles near the window; wherein the window is located on the radially outer side of the ring area of ​​the pocket, and is not located in the transition area of ​​the scleral lens , the transition zone is configured to be positioned above the corneoscleral limbus of the eye when worn. The lenses of the present invention are not attracted to the cornea, can be worn comfortably and maintain clear visual acuity for up to 12 hours.

The invention relates to the field of optical instruments, in particular to a binocular telescope and an adjustment method for the binocular telescope. The binocular telescope comprises a visual acuity adjustment component and a focal length adjustment component, wherein the visual acuity adjustment component is used for adjusting the visual acuity of a first lens barrel based on the visual acuity of a second lens barrel; and the focal length adjustment component is used for adjusting the focal length of the first lens barrel and the focal length of the second lens barrel at the same time. The adjustment method comprises the following steps of: taking the visual acuity of the second lens barrel as a reference, adjusting the visual acuity of the first lens barrel; and on the basis of keeping the visual acuity of the first lens barrel and the visual acuity of the second lens barrel unchangeable, adjusting the focal length of the first lens barrel and the focal length of the second lens barrel at the same time. The adjustment device provided by the invention has a simple structure and a small matching area with the main body of the binocular telescope, the production cost is greatly reduced, and the adjustment device is convenient to seal, and is simple and convenient to operate during adjustment.

An interactive fit tool and methodology which may be utilized by an eye care professional to improve the efficiency and final outcome in selecting a pair of contact lenses targeted towards a specific patient visual need in the treatment of presbyopia. The interactive fit tool comprises an application which includes images that would allow a patient to decide if he or she desires balanced visual acuity, near biased visual acuity, or distance biased visual acuity. In addition, the interactive fit tool comprises fit guide tables and performs the calculations for vertex distance and spherical equivalent.

The present invention relates to a cabin (10) used to quantify visual acuity independently of the verbal information given by the patient (pc) using the 'Teller' technique in environments such as doctor's surgeries and clinics by professional specialists. Said cabin (10) is made up of a modular structure (20) consisting of an isolated environment (AS) for the patient (pc) to take the preferential acuity test by reading 'Teller' cards (CT) arranged in a viewing area (21a) provided in the central portion of the moveable wall (21) that is arranged to slide on casters (rd) on rails (30) and (31) installed on the floor (22) and ceiling (25) supported by profiles (25a). The entire modular structure (20) is matte white and has dedicated lighting (IL) controlled and adjusted as a function of the test. A seat (28) is installed in front of the moveable wall (21) coplanar with the rear wall (24) of the cabin (10) for use by the patient (pc) and helper where applicable. Sliding the moveable wall (21) adjusts the distance (d1) between the patient (pc) and the viewing area (21a) of the cards (CT), wherein the minimum distance is 38 cm and the maximum distance is 84.55 cm, with an accuracy appropriate for the effectiveness of the test according to the characteristics of the patient (pc).

Apparatuses, methods, systems, and program products are disclosed for adjusting display settings of a head-mounted display. An apparatus includes a processor and a memory that stores code executable by the processor. The code is executable by the processor to receive sensor data from one or more sensors operably connected to a head mounted display (“HMD”) unit while a user wears the HMD unit. The code is executable by the processor to determine a visual acuity of the user based on the sensor data. The code is executable by the processor to adjust one or more display settings of the HMD unit based on the determined visual acuity for the user. The one or more display settings may be adjusted to correct for impairments in the user's visual acuity.

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.

The invention relates to: a method for optimizing optical aids by automatically measuring subjective visual acuity; a method for producing correspondingly optimized optical aids; a device for producing optical aids; a A computer program having program code for executing the optimization method, the program being executable on a processor; and a non-transitory storage medium including the computer program stored thereon.