74 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.

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.

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.

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 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.

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.

The invention relates to a method for providing control data for an ophthalmic laser (12) of a treatment device (10). The method comprises, as steps: determining parameters of an epithelial layer and a stroma of a cornea (16); determining a correction profile (14) for correcting a refractive error of the cornea (16); determining data of a virtual postoperative cornea expected by treating the cornea (16) with the correction profile (14), wherein the data of the virtual postoperative cornea are determined as a function of an epithelial layer model in which epithelial regrowth of the cornea is modeled, wherein model parameters of the epithelial layer model are provided from statistics of epithelial regrowth processes of a given population group;a determination of a correction difference between an originally planned correction and a virtually achieved correction; an adjustment of the correction profile (14) depending on the correction difference; and a provision of the control data for the ophthalmic laser (12) that includes the adjusted correction profile.;

In certain embodiments, a surgical contact lens system for ophthalmic treatment with a laser beam includes a patient contact lens and a surgical contact lens. The patient contact lens reduces one or more refractive errors of the eye and has a concave surface and a convex surface. The concave surface is to be disposed outwardly from a cornea of an eye. The surgical contact lens has an eye end to be disposed outwardly from the convex surface of the patient contact lens. The surgical contact lens includes a frame and an optical component coupled to the frame. The patient contact lens reduces pressure from the surgical contact lens to reduce corneal folding of a posterior surface of the cornea. The optical component of the surgical contact lens and the patient contact lens transmit the laser beam to treat the eye.

The present invention is directed to treating presbyopia, irregular astigmatism, and / or refractive error, comprising administering a composition comprising from about 0.1% to about 3.5% w / v of aceclidine to a subject in need thereof, wherein administration occurs 2 or more times within 24 hours of initial administration.

A presbyopia-correcting multifocal contact lens system with a design dependent on refractive error correction for hyperopia / myopia. A multifocal contact lens is part of a multifocal contact lens system ("lens system") that includes multiple myopia-correcting and hyperopia-correcting lenses, each lens having an additional optical area for presbyopia correction, selected based on refractive errors, and fitted to the wearer, who is the patient. To improve far-distance visual acuity in hyperopia, the spherical aberration (SPHA) profile, additional optical area diameter, and / or additional refractive power of the hyperopia-correcting lens within the lens system are optimized based on the hyperopia patient characteristics, which may differ from the myopia patient characteristics used to optimize the myopia-correcting lens within the lens system. Such design optimization may also depend on refractive error for further enhanced far-distance visual acuity.

The invention relates to a method for providing control data for an ophthalmic ablation laser (12) of a treatment device (10). The method comprises determining a laser pulse positioning inaccuracy based on a predetermined statistic of eye movements and a predetermined processing latency, wherein the processing latency comprises a latency of a camera device (24), a beam deflection device (22), and the ablation laser (12); determining an ablation volume (14) for correcting a refractive error as a function of the determined laser pulse positioning inaccuracy; and providing the control data for controlling the ablation laser (12), which includes the determined ablation volume (14).

Lenses and methods are provided for improving peripheral and / or central vision for patients who suffer from certain retinal conditions that reduce central vision or patients who have undergone cataract surgery. The lens is configured to improve vision by having an optic configured to focus light incident along a direction parallel to an optical axis at the fovea in order to produce a functional foveal image. The optic is configured to focus light incident on the patient's eye at an oblique angle with respect to the optical axis at a peripheral retinal location disposed at a distance from the fovea, the peripheral retinal location having an eccentricity between −30 degrees and 30 degrees. The image quality at the peripheral retinal location is improved by reducing at least one optical aberration at the peripheral retinal location. The method for improving vision utilizes ocular measurements to iteratively adjust the shape factor of the lens to reduce peripheral refractive errors.

Method for providing control data for an ophthalmic surgical laser (18), wherein the method comprises the following steps performed by a control device (20): - Determining refractive error data for at least one eye-specific parameter describing a refractive error and / or a geometry causing the refractive error of a human or animal eye (36) (S1), - based on the determined refractive error data: Determining a lenticule geometry that describes the dimensions of a lenticule (12) and its position (S2), - Defining a posterior interface (14) of the lenticel (12) and an anterior interface (16) of the lenticel (12) as intersection surfaces to form the lenticel (12, S3), - Defining at least two differently positioned incision paths (46, 48), each extending from a predetermined incision site on an outer surface of the cornea (17) to one of the defined interfaces (14, 16) (S4); wherein the predetermined incision sites are at a predetermined angle to each other about a predetermined reference point, and wherein only one of the incision paths (46, 48) extends only to the defined anterior interface (16) within a lenticule rim (40) where the defined anterior (16) and the defined posterior interface (14) meet; wherein the further incision path (48) lies outside the lenticule rim (40) and within the larger of the two interfaces (14, 16), and - Providing control data for controlling the ophthalmic surgical laser (18) which describe the at least two specified incision paths (46, 48) and the specified interfaces (14, 16) (S7).

1. Name of the product in this design: Vision Refractive Error Screening Instrument. 2. Purpose of this design: This design is used for visual acuity and refractive error screening. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D rendering 1.

A compact line- or full-field optical coherence tomography (OCT) system designed for high-resolution retinal imaging with reduced artifacts employs quarter wave plates in both the sample and reference arms to manipulate the polarization state of light, effectively suppressing spurious reflections and coherence repeat artifacts. A symmetrical arrangement of, for example, Plössl eyepiece and camera objective lenses minimizes optical aberrations and maintains a flat imaging field despite the retina's curvature. The scanning galvanometer mirror is positioned at the conjugate plane of the patient's eye pupil and sized to act as an aperture stop. An adjustable eyepiece compensates for individual refractive errors, enhancing image clarity across a wide range of patients.

This utility model discloses a protective cover for an oral scanner, including a main body. A rectangular through-hole is formed on the front surface of the main body near the upper end. A semi-circular groove is formed on the side of the main body. A circular through-hole is formed inside the rectangular through-hole. A lens adjustment mechanism is movably installed inside the rectangular through-hole. A slot is formed on the front surface of the main body near the lower end of the rectangular through-hole. This protective cover for an oral scanner, through the lens adjustment mechanism, allows the operator to adjust the tilt angle of the protective lens as needed and clamp it in place. This effectively reduces refraction errors, improves image quality, ensures accurate measurement by the oral scanner, and reduces the influence of the protective lens on the final scanning image result. The protective clip can be fitted and clamped onto the upper end of the oral scanner protective cover, making assembly and disassembly simple. It also seals the rectangular through-hole, preventing dust and foreign objects from adhering to the surface of the protective lens before use.

Described herein are systems and methods for refraction correction of OCT images configured for intraoperative use, including: a deep-learning model configured to receive a plurality of OCT images; and an imaging device configured to generate the plurality OCT images during an intraoperative procedure; wherein the deep-learning model is configured to map, in real-time, the plurality of OCT images to a two-dimensional vector field over a spatial domain of the plurality of OCT images; wherein the mapping is configured for real-time correction of refraction errors on the plurality of OCT images by employing Snell's law to generate a plurality of refraction-corrected OCT images via the deep-learning model. Other examples are described including features of the deep-learning model uniquely configured for interoperative usage such as an OCT image processing speed of 20Hz-50Hz.