124 results about "Refraction errors" patented technology

The invention belongs to the technical field of data processing, and provides a scale detection and scale conversion method and system based on an ultrasonic image, and the method comprises the steps: constructing a discrimination function fusing multi-modal features according to the spectral basis functions of different scales, and determining the scale contour of the scales in the ultrasonic image; the design can dynamically adapt to the spectral characteristics and structural characteristics of the scale, can effectively cope with the interference of scale diversity, ultrasonic speckle noise and the like of equipment of different manufacturers, and ensures the stability of scale positioning and subsequent conversion; the method comprises the following steps of: establishing a biomechanical-image deformation coupling model by taking a scale contour of a scale in an ultrasonic image as a geometric reference and combining biomechanical characteristics of an ultrasonic probe and tissues to obtain a corrected pixel distance between adjacent scale points of the scale; and curvature compensation for eliminating refraction errors of ultrasonic waves in curved tissues is introduced to correct a scale pixel-millimeter conversion coefficient, so that the pixel-millimeter conversion error rate is reduced to 1.2%, which is far lower than the level of a traditional method.

The invention relates to the field of low-altitude monitoring and target identification, and discloses a dynamic target detection method based on a three-dimensional low-altitude monitoring radar. The method comprises the following steps: performing three-dimensional scanning to obtain low-altitude echoes, and resolving three-dimensional coordinates of a target based on Doppler frequency shift and array angle measurement; clutters are suppressed by adopting space-time adaptive processing and constant false alarm rate detection; separating real echo and mirror image interference by using a sparse reconstruction method; fine classification of dynamic targets such as an unmanned aerial vehicle is realized through micro-Doppler features; judging abnormity in combination with trajectory entropy and divergence, and correcting refraction errors by using atmospheric stratification imaging; and further identifying a group cooperation behavior based on graph clustering and a speed consistency index, and outputting multi-level layered early warning information. Compared with the prior art, a closed-loop link from single-target detection to group situation analysis is realized, high reliability, anti-interference performance and pre-warning capability are realized, and the detection precision and situation awareness level in a complex low-altitude environment can be remarkably improved.

A lens element intended to be worn in front of an eye of a wearer, the lens element comprising:-a holder, and-a plurality of optical elements superimposed on the holder, each optical element simultaneously provides a first optical function based on a prescription of the wearer for correcting refractive abnormalities of the eye and a second optical function that does not focus an image on the retina of the eye, characterized in that each optical element comprises a central region and a plurality of outer regions surrounding the central region, a maximum height of the central region is smaller than a maximum height of the outer region.

The invention relates to a refractive error detection system and method. The refractive error detection system comprises a plurality of lens assemblies and a mobile terminal device. Wherein the multiple groups of lens assemblies are arranged on the front surface or the rear surface of the mobile terminal equipment and are in communication connection with the mobile terminal equipment; wherein each group of lens assemblies comprises a flash lamp, a first camera and a second camera which are arranged along the astigmatism meridian corresponding to each group of lens assemblies, and the lens assemblies are used for collecting eye images; and the mobile terminal equipment is used for inputting the eye image into the completely trained refractive error detection model and acquiring a refractive error detection result output by the refractive error detection model. Through the method and the device, the problems of relatively high detection cost and relatively low detection efficiency of the refractive error in related technologies are solved, and the technical effects of reducing the detection cost of the refractive error and improving the detection efficiency of the refractive error are achieved.

A method for automatically determining multifocal lens parameters associated with a contact lens and a contact lens for correcting ametropia of a patient's eye wherein a personalized multifocal contact lens for treating presbyopia takes into account various related clinical patient measurements including patient clinical data and lifestyle data, to determine which lens is likely to provide personalized lens parameters for new patients. Historical patient clinical data and lifestyle data are used to train the system to predict which multi-focal lenses (i.e., lenses including lens designs and having lens geometries and powers) would result in optimal lens-to-eye fit and optimal visual function for each eye of presbyopia patients.

Provided herein are a soft contact lens for correcting an ocular refractive error of an eye, the soft contact lens comprising a vaulted portion and a specialty feature.

A method of determining an angle of repose of a contact lens on an eye of a user of the contact lens, the method comprising, at a computing device 100: obtaining data indicative of a refractive error

The embodiment of the invention provides an out-of-focus lens and a design method thereof. N annular optical correction areas and N annular optical out-of-focus areas are alternately arranged on the radial outer side of one circular optical correction area and are concentric. The ratio of the total area of the annular optical defocus area to the total area of the defocus lens is 0.55-0.58. The focal power of the optical correction area is first focal power, and the focal power of the optical defocus area is second focal power. The optical correction area image space focus is located on the image space of the annular optical correction area image space focus. By applying the embodiment, the plurality of optical correction areas form a clear image on the retina of the human eye to correct refractive error of the human eye, the plurality of optical defocus areas form an image in front of the retina to generate myopia defocus to delay eye axis growth, the optical correction areas and the optical defocus areas are alternately arranged, and the eye axis growth is delayed by controlling the areas of the optical correction areas and the optical defocus areas. The peripheral defocusing effect is achieved, the visual quality is improved, and the myopia progress is delayed.

A vision screening device displays visual stimuli and captures image(s) of the eye while the visual stimuli is changing over a period of time. The vision screening device uses the images to determine and monitor refractive error, ambient light level(s), pupil size, and gaze angle as the visual stimuli changes over the time period. Based on the refractive error, a determination of hyperopia and / or presbyopia is made. Based on the gaze angle and / or the pupil size, a confidence metric is determined. Based on the confidence metric and / or the determination, a recommendation for the patient is generated and displayed.

Computer-implemented method for estimating a future change in an axial length and / or a refractive error of an eye. The method includes receiving a dataset relating to an individual patient comprising

An ultraviolet laser-based (UVL) laser vision correction (LVC) system, a contact interface and a contact interface system for such a UVL-LVC system. The invention facilitates a coupling and affixation between the patient's eye and the UVL-LVC system by application of a contact interface for the purposes of preventing eye movements when using UVL-LVC systems. The invention includes a UVL-LVC system with a base unit and an application arm which has a contact interface adapter on an application part of the application arm, to which a contact interface is affixable, the contact interface being usable to be to affix a patient's eye to the UVL-LVC system. The contact interface may have a conical wall and a suction ring but not a lens element, and optionally has an access opening or a corresponding contact interface system made of a contact interface adapter and a contact interface.

The present disclosure is particularly directed to contact lens devices and / or methods for myopia treatment. The present disclosure is directed to modifying the incoming light by a contact lens, using a stop signal to slow the rate of progression of myopia. More particularly, the present disclosure is directed to a purposeful configuration of a non-circular, non-transparent aperture stop on the original base single-vision optic zone of a contact lens that can facilitate the redistribution of light energy into the oblique frequencies of the retinal image to provide an optical stop signal that prevents, reduces or controls the progression of refractive error of progressive myopia.

A head-mounted display may include a display system and an optical system in a housing. The display system may have displays that produce images. Positioners may be used to move the displays relative to the eye positions of a user's eyes. An adjustable optical system may include tunable lenses such as tunable cylindrical liquid crystal lenses. The displays may be viewed through the lenses when the user's eyes are at the eye positions. A sensor may be incorporated into the head-mounted display to measure refractive errors in the user's eyes. The sensor may include waveguides and volume holograms, and a camera for gathering light that has reflected from the retinas of the user's eyes. Viewing comfort may be enhanced by adjusting display positions relative to the eye positions and / or by adjusting lens settings based on the content being presented on the display and / or measured refractive errors.

This application discloses a method and electronic device for predicting intraocular lens (IOL) selection and rotation implantation, relating to the field of computer technology. This application acquires the user's ocular biological measurement parameters and constructs an intraocular geometric constraint region. The IOL is abstracted as a rectangular geometries, generating a set of candidate size-axis positions. Each candidate option satisfies the geometric constraints of the patient's intraocular anatomy in terms of implantation position and rotation angle. Based on this, by combining the geometric fit indices of the candidate options with individualized ocular biological parameters, the postoperative arch height, the probability of abnormal arch height, and postoperative refractive results are predicted. After post-processing and calibration, outputs with confidence intervals or risk probabilities are provided. This eliminates reliance on experience or rough estimates for surgical planning, effectively reducing the risk of arch height deviation or postoperative refractive errors, providing the optimal IOL option, and achieving individualized, quantifiable, and predictable implantation planning.

In general, one aspect disclosed features a lens comprising: a central zone having an optical center corresponding to the visual axis of an eye of a patient; and a peripheral zone peripheral to the central zone and comprising: a first zone having a first thickness, and a second zone having a second thickness, wherein: the second thickness varies from the first thickness, and a distance from the second zone to the optical center of the central zone is selected to generate pincushion distortion or barrel distortion in the eye of the patient.

Method for generating control data which are designed to control a laser processing device (L) for the surgical correction of refractive errors of an eye (3), wherein an anterior cutting surface (19), a posterior cutting surface (20) and a marginal cut (30) are defined for the delimitation of a volume (18) in the cornea (5), which are to be generated as cutting surfaces in the cornea (5), wherein - the posterior cut surface (20) has a non-circular, oval edge (38) which lies in a plane (40), - the marginal cut (30) connects the marginal (38) with the anterior cut surface (19) and - the boundary section (30) is formed as the lateral surface of a non-rotationally symmetric cylinder or truncated cone, whose guide curve is the boundary (38).

The invention provides a diopter dynamic measurement method based on an eye time sequence image, and relates to the technical field of eye refraction diagnosis, and the method comprises the following steps: when a programmed switching visual adjustment stimulus is presented to a tested eye, collecting a time sequence image sequence of the tested eye containing Placido ring projection, and recording an adjustment stimulus value corresponding to each frame of image; processing each frame of image in the time sequence image sequence, and extracting image features related to the refractive state to form time sequence dynamic features; and based on a time sequence association relationship between the time sequence dynamic characteristics and the adjustment stimulation value, distinguishing and removing a dynamic refraction change component associated with the visual adjustment stimulation in the time sequence dynamic characteristics so as to obtain a static diopter estimation value representing the inherent refraction state of the tested eye. According to the invention, high-precision static diopter measurement in a non-mydriasis natural state can be realized.

To provide a monitoring method for an eyeball emmetropization process.SOLUTION: The method includes the following steps: acquiring eyeball data information about an eyeball to be monitored; outputting retinal optical characteristic data information about the eyeball to be monitored on the basis of the eyeball data information about the eyeball to be monitored and reference eyeball data information; and analyzing and processing the retinal optical characteristic data information about the eyeball to be monitored, and outputting, for the eyeball to be monitored, an equation representing individual emmetropization characteristics as well as related parameters. Through the present application scheme, the refractive development status of children or adolescents whose ocular refractive system is in a developmental period is monitored, and, when any abnormal tendency is detected, attention is promptly given so as to control the progression of emmetropization of the eye within a normal range. For children or adolescents in whom refractive error of the eye already exists, the degree of the refractive error and its progression are monitored and analyzed, and a future tendency of emmetropization of the eye and a future change amount of axial length are predicted.SELECTED DRAWING: None

The present disclosure pertains to the phakic refractive lenses such as toric lenses, an advanced posterior chamber floating phakic refractive lens (PRL) designed for the correction of severe refractive errors, including myopia, hyperopia, and astigmatism. This innovative lens can reduce or minimize complications commonly associated with traditional phakic intraocular lenses, such as intraocular pressure elevation, cataract formation, and iris pigment dispersion. The phakic refractive lenses such as the toric lenses described herein feature a buoyant, flexible structure with a central aperture to facilitate aqueous humor flow, creating a natural centering force that stabilizes the lens within the pupillary space.

A system for obtaining diagnostic eye information is disclosed.SOLUTION: The system comprises at least one energy source for directing electromagnetic energy towards the eye of the subject, a plurality of sensory units, each sensory unit being associated with an associated position within the field of view of the eye, each sensory unit being adapted to obtain refractive information from the eye in response to the electromagnetic energy, and a processing system for determining refractive error information associated with each position of each sensory unit within the field of view of the eye and for determining refractive error composite information about the eye in response to the refractive error information associated with each sensory unit and independent of the gaze direction of the eye.SELECTED DRAWING: Figure 1

A system includes system housing, an eccentric radiation source, and a radiation sensor. The radiation produced by the eccentric radiation source can be collected by the radiation sensor to generate images of retinas for a patient. The system also includes a vision screening device connected with the eccentric radiation source and the radiation sensor via the system house that can control and synchronize actions for the eccentric radiation source and the radiation sensor. The vision screening device further analyzes the images generated by the radiation sensor via neural network algorithms to determine spherical error slopes, refractive errors, and recommendations for the patient.

This invention relates to the field of refractive error detection technology, and discloses a method, device, and medium for estimating refractive power based on infrared off-center photography images. The method uses infrared pupil images of each LED group in an array of LED beads when they are lit as feature images of each channel, forming a pupil feature image. This pupil feature image is input into the refractive error prediction model, where it is convolved through a residual convolutional layer to obtain a primary feature image. This primary feature image is then input into a relative orientation feature module to obtain a relative orientation feature image. The relative orientation feature image is then passed sequentially through multiple cascaded residual blocks to obtain residual features. These residual features are then passed through a global average pooling layer and fed into parallel and independent first and second fully connected layers to obtain predicted spherical and cylindrical refractive power values.

This invention belongs to the field of myopia prevention and control technology, and relates to a method, device, and medium for myopia prevention and control based on genetic and environmental factors. Based on myopia data of each blood relative of the user to be intervened, the variant sites in the myopia-related single nucleotide polymorphism genotype, and the number of risk alleles, a myopia genetic risk index is calculated. Based on the user's daily outdoor activity time, total daily eye use time, daily near-vision time, and daily low-light eye use time over several consecutive days, an outdoor activity stability index, a near-vision load index, and an eye use light stability index are calculated, thus obtaining an environmental myopia risk index. The axial length, refractive error, myopia genetic risk index, and environmental myopia risk index of the user to be intervened are input into an adaptive Bayesian myopia risk prediction model, which outputs the myopia risk change trajectory under different myopia intervention intensities, including the predicted mean and uncertainty interval, thereby obtaining a myopia intervention strategy.

A computer implemented system and method for determining and analysing ocular refractive error of an eye. The method determines a set of sample biometric factors for a reference sample of eyes from a set of reference sample physical characteristics. Physical characteristics of a patient's eye are measured such that the type of measured patient physical characteristics include some or all of the reference sample characteristic types. Patient biometric factors are then calculated based on the measured and inherent patient physical characteristics and compared with the sample biometric factors to determine the effect of one or more parameters on the ocular refractive error of an eye. The method may calculate the difference between the refractive contribution of the axial length, cornea and internal optics in the patient's eye and the separate contribution from those factors in the sample physical characteristics.

A method for controlling a wearable device configured to dynamically correct a vision defect of a user is provided. The method includes generating at least one first image frame for providing a virtual reality or an augmented reality through the wearable device, obtaining, through at least one camera of the wearable device, at least one second image frame of an ocular of the user, identifying at least one first feature from the at least one first image frame, wherein the at least one first feature comprises at least one of one or more content features or one or more display features, and one or more user gesture features, identifying at least one second feature from the at least one second image frame, wherein the at least one second feature comprises one or more ocular features of the user, based on the at least one first feature and the at least one second feature, determining a type of a refractive error of the user while the virtual reality or the augmented reality is provided, adjusting, based on the type of the refractive error, at least one of the identified content features or the identified display features, and based on the at least one of the adjusted content features or the adjusted display features, providing the virtual reality or the augmented reality.

This application discloses an optical element and an optical wearable device. The optical element includes a substrate with a visible field of view and a control area surrounding the visible field of view. The control area has multiple recessed structures, each with an opening and an optical functional surface. The optical functional surface and the opening together define the recessed structure. The optical functional surface and the surface of the substrate have an angle, so that incident light rays can be deflected when passing through the optical functional surface along the thickness direction, thereby forming a blurred image in the peripheral retina, reducing the imaging quality of the peripheral retina and suppressing the abnormal development of refractive errors.

The present disclosure is directed to lens, methods of making, designing lens and / or methods using lens in which performance may be improved by providing one or more steps in the central portion of the optical zone and one or more steps in the peripheral portion of the optic zone. In some embodiments, such lens may be useful for correcting refractive error of an eye and / or for controlling eye growth.

The present invention provides a self-position estimation device and method that enable highly accurate self-position estimation of a camera without being affected by refraction errors caused by a light-transmitting part placed in front of the target. [Solution] The self-position estimation device 50 includes a self-position estimation unit 62 that estimates the self-position of the camera 20 based on an image taken by the camera 20 of a target group 16 in which a transparent window material 30 is placed in front of a plurality of targets 24; a line of sight detection unit 68 that detects a line of sight L from the principal point of the camera 20 toward the target 24 through the transparent window material 30 based on the self-position of the camera 20 estimated by the self-position estimation unit 62; and a correction unit 70 that corrects the self-position of the camera 20 based on the distance between the line of sight L and the target 24.

This invention provides a myopia screening device. The first end of the housing is designated as the detection end for testing the subject's eyes. A visual target screen, a screening camera, and an optical path assembly are all housed within the housing. The visual target screen is located on one side wall of the housing, the optical path assembly is positioned between the detection end and the visual target screen, and the screening camera is located at the second end of the housing. The screening camera captures a light and shadow image of the subject's pupil. A processor processes and analyzes the light and shadow image captured by the screening camera. An input device communicates with the processor and inputs the image seen by the subject on the visual target screen into the processor. This invention enables not only refractive error testing but also visual acuity testing and color blindness / color weakness testing. Furthermore, this invention can estimate the subject's visual acuity based on the refractive error test results, generate a corresponding estimated visual target based on the estimated visual acuity, and quickly complete the visual acuity test, effectively shortening the visual acuity screening time.