136 results about "Refractive error" patented technology

The invention belongs to the technical field of refraction detection, and particularly relates to a human eye dynamic refraction detection method based on a three-dimensional phase deflection method. The method comprises the following steps: S1, based on a three-dimensional phase deflection imaging system and an iterative representation integral algorithm, obtaining a 3D shape of a to-be-detected human eye in place in real time; s2, on the basis of the 3D shape of the to-be-detected human eye, the current staring direction of the to-be-detected human eye is obtained in real time in place by combining a ray tracing method; s3, establishing a refractive imaging system, and obtaining a diopter value of the to-be-measured human eye in the current staring direction in real time in place based on the refractive imaging system; and S4, fitting different staring directions of the to-be-detected human eyes and the dynamic numerical curve of the diopter values in the corresponding staring directions to realize human eye dynamic refraction detection. According to the method, an accurate treatment scheme can be accurately provided for the ametropia patient in a real scene, and guidance can be provided in the aspect of personalized customization of the spectacle lenses.

The invention discloses a wafer six-surface detection automatic focusing method comprising the following steps: correcting the crystal grain position through a feeding XYR platform, and obtaining a to-be-detected crystal grain image; according to a to-be-detected crystal grain image, edge points in the edge contour of the crystal grain are converted into geometric parameters by using a Hough transform algorithm, and a position compensation value of the crystal grain is calculated; determining an optimal focus position of a front / back detection station of the to-be-detected crystal grain according to the optical characteristics, the light deflection angle and the incident light intensity of the crystal grain, and adjusting the focus position of the focusing module; according to the position compensation value of the crystal grain, an electric sliding table is controlled to carry an optical camera to move in place and focus and image; and by comparing actual detection data with prediction results of the refraction deviation correction model and the crystal grain front / back focus adjustment model, the accuracy of the model is evaluated and optimized. According to the invention, the problems of position error, optical characteristic difference, refraction deviation and the like in the prior art are effectively solved, and efficient and accurate crystal grain detection is realized.

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 discloses a peripheral retina data-based microstructure lens and a design method, and the lens comprises a mother lens which is provided with a first surface facing the retina of a human eye; the first surface comprises a central luminosity area, a luminosity modulation area and a luminosity compensation area which are arranged in sequence; the central luminosity area, the luminosity modulation area and the luminosity compensation area are respectively arranged around the optical center in a concentric circle mode; the luminosity modulation area is provided with a plurality of first areas which are divided into equal areas, the luminosity compensation area is provided with a plurality of second areas which are divided into equal areas, and the first areas and the second areas are adjacent in the first direction and jointly matched so as to be used for intervening the imaging quality of the retina within the pupil range. Peripheral retina data is adopted to carry out design compensation on spectacle lenses, so that a more accurate and more personalized correction mode is realized, and an optimal management method for inhibiting ametropia can be selected according to the actual condition of a wearer.

A computer-implemented method for determining a refractive error of an eye of a person includes the following steps: a) generating input data containing a distance between the eye of the person and a visual stimulus displayed to the eye of the person and b) generating outcome data containing a refractive error of the eye of the person determined by evaluating the input data. A position of the entrance pupil of the eye of the person is considered when the refractive error of the eye of the person is determined. A computer program, a field device, a remote device, a determining device, a method for producing a geometrical model of a spectacle lens, and a method for producing a spectacle lens are also disclosed. The present disclosure provides a fast, easy, versatile, reliable, and accurate approach for determining a refractive error of an eye of a person.

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.

The invention provides a fundus OCT imaging diopter adaptive matching method and device, and relates to the technical field of retina imaging, and the method comprises the following steps: detecting pupil positions in real time, automatically tracking pupils, and controlling a reference arm motor and a sample arm motor to move to initial positions; a reference arm motor is controlled to move, meanwhile, a retina structure in an OCT image is detected through a deep learning algorithm, and the eye axis length of the testee is automatically matched; the reference arm motor and the sample arm motor are controlled to move synchronously, the retina focusing position is found by calculating the composite information entropy of the OCT image, and the diopter of the testee is automatically compensated; and detecting and adjusting the position of the retina in the image by using a deep learning algorithm to cover retina imaging with a large view. According to the method, the OCT imaging device is automatically controlled, an automatic solution is provided for eye ground screening of people of multiple age groups and various ametropia groups, the overall image quality collected by OCT is improved, and the operation simplicity and the imaging speed are remarkably improved.

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.

The invention relates to the glasses industry, and aims to provide a lens structure for assisting eye disease rehabilitation by filtering and a manufacturing method thereof. A traditional lens is mainly used for correcting ametropia, and on the basis, by changing the filtering permeability of the lens, the filter lenses with different colors are used for filtering light rays with different wavelengths, the light rays act on fundus cells, the functions of the fundus cells are affected, and the effects of protection and auxiliary treatment of eye diseases are achieved. Yellow, tawny, gray, red and Finnish green filter lenses and sleep-aiding blue lenses (10%-30% of dyed lenses) are specifically designed. Lenses with different colors have unique filtering characteristics and can play a role in different eye diseases, for example, a light yellow lens is added to amblyopia to accelerate rehabilitation, and a brown lens is added to macular degeneration to suppress disease development. Meanwhile, the invention further provides a lens manufacturing method which comprises the steps of adding a color matching standard, carrying out standard operation on a dyeing heating process and the like, and the lens chromatic aberration is controlled in the horizontal direction so as to ensure the lens quality and the filtering effect.

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.

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.

The present invention provides a spectacle lens for regulating the axial growth of adolescents' eyes. The spectacle lens comprises a first refractive area providing a first diopter for correcting refractive errors; and a second refractive area focusing light on a location other than the retina and providing one or more second diopters different from the first diopter. The second refractive area is provided with a plurality of interconnected microlenses. The spectacle lens can effectively regulate the axial growth of adolescents' eyes, thereby inhibiting the progression of refractive errors.

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.

The invention relates to a device (200) for determining refractive errors of at least one eye (1) of a subject, the device comprising: a correction system (110) comprising a variable power optical system; a system for measuring the refractive error of said eye, comprising a light source (31), an illumination optical system (33) adapted to direct a light beam towards the eye (1) of the subject in order to form a reflected light beam (34), an image detection system (35), and a beam splitter (10) adapted to direct the reflected light beam (34) towards the image detection system (35), the beam splitter (10) enables a user to see a target scene through the optical beam splitter (10) and the variable-power optical system at the same time; and a computing system comprising an image processing system adapted to process the image and derive therefrom a measure of refractive error of the eye.

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.

The invention discloses an RFPA four-dimensional professional examination method, which comprises a first examination module (referred to as R for short) for examining monocular and binocular near and far vision of a patient in a natural state to obtain a first examination result; the second examination module (Fusion for short) is used for examining the far and near image fusion condition of the patient according to the first examination result to obtain a second examination result; and the third examination module (Phoria for short) is used for examining the far and near eye position conditions of the patient according to the second examination result to obtain a third examination result. The method is reasonable in design, the simple visual function four-step inspection method is used, the situations and problems of the eye ametropia problem, the image fusion function problem, the strabismus and adjusting function of a patient can be rapidly and accurately inspected, and a basis is provided for accurately correcting the visual abnormality problem of the patient.

An ablatable corneal inlay for correction of refractive errors and / or presbyopia, and a method of correcting refractive errors and presbyopia in an eye of a patient using an ablatable corneal inlay is disclosed herein.

The application provides a full-automatic optometry topographic chart instrument, comprising an imaging system and a control processing system, the imaging system comprises an imaging assembly, an illumination device and a shooting device, the light exit side of the illumination device is provided with a projection objective, the light exit side of the projection objective is provided with a digital micromirror device or a transmission type calibration plate with a projection pattern, and the projection pattern is used for assisting qualitative and quantitative analysis of the refractive degree of the human eye; the control processing system comprises a data processing module for receiving fundus images and calculating a generated topographic chart and an output display module for displaying the topographic chart. The application also provides an optometry method using the full-automatic optometry topographic chart instrument. The full-automatic optometry topographic chart instrument and the optometry method provided by the application have simple equipment structure, low cost, complete detection parameters, and can obtain the ametropia condition of the human eye through the change of the projection pattern characteristics, and then obtain the optometry topographic chart through image processing.

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.

An optical element may include two or more zones to perform functions in a head-mounted display (HMD) device. An optical component may include a first optical zone characterized by a first sag profile to correct a refractive error of an eye of a user and a second optical zone characterized by a second sag profile to redirect a path of an illumination light beam. A transition zone located between the first optical zone and the second optical zone may provide a smooth transition between the first optical zone and the second optical zone.

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.

The present invention provides a design method and a design device for orthokeratology lenses. The method includes obtaining the actual refractive error degree, pupil radius, corneal horizontal visible iris diameter, the average of the first, second and third curvatures, and the maximum and minimum values ​​of the second curvature; determining the curvature and radius of the base arc segment according to the pupil radius, visual adjustment factor, the average of the first curvature, the actual refractive error degree and the overcorrection coefficient; determining the radius and curvature of the reverse arc segment according to the actual refractive error degree; determining the radius and curvature of the first and second positioning arc segments according to the corneal horizontal visible iris diameter and the average of the second and third curvatures; determining the arc segment width radius of the peripheral arc segment according to the comfort factor; and determining the curvature of the peripheral arc segment according to the correction parameter and the average curvature of the corneal position in the peripheral arc area; and determining the amount of annular curvature according to the maximum and minimum values ​​of the second curvature. Designing a lens that best matches the cornea based on the real corneal parameters to achieve better lens refractive correction.

The present invention relates to an apparatus, a computer program and a method for correcting refractive errors of vision. In a first example, a position (480) of a desired focus point (440) relative to the retina of an eye can be determined based on topographic information obtained about the anterior corneal surface (401) and the posterior corneal surface (402) and refractive aberration information of an individual eye. In a second example, correction information (416, 496) related to the anterior corneal surface (401) can be determined based on the topographic information obtained about the anterior corneal surface (401) and the posterior corneal surface (402) and based on topographic information obtained about the anterior lens surface (431) and the posterior lens surface (432) of the individual eye to optimize focusing on the retina of the eye.