56 results about "Refractive error" patented technology

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.

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.

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 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 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.

The invention relates to a method and device for determining the size of a phakic corrective implant for correcting the vision of the eye (3) of a patient. On the basis of a horizontal section (6) of the anterior segment of the eye and an optical power Po, the size of a plurality of implants taken from a base Ii is determined (34), the image of the respective positions of these implants is geometrically simulated (35) on reconstructed curves s1, s2,...si of the section, then the value Vtsci of the theoretical vault without compression and the total theoretical compression CTi are calculated (37), the probability of obtaining a satisfactory vault between two threshold values S1 and S2 is calculated (42) by taking into consideration the cases of patients who have been operated for whom the respective differences between their Vtsci and vaults postoperatively for a given compression CTi have been calculated, and the implant size that has the highest probability between S1 and S2 is selected (43).

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.

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.

A method for aligning a system for laser-based ametropia correction relative to a patient's eye to be treated is disclosed. Predefined pre-operative measurement data which characterize at least predetermined structures of the patient's eye is provided. The predetermined structures include a part of the patient's eye to be treated. In addition, the method includes measuring at least one part of the predetermined structures of the patient's eye using an OCT system immediately before and / or during treatment for ametropia correction of the patient's eye and providing OCT measurement data, and comparing the OCT measurement data and the predefined pre-operative measurement data and preparing comparative data. The method also includes ascertaining a position and / or orientation of the part of the patient's eye to be treated relative to the system and aligning the system relative to the patient's eye using the ascertained position and / or orientation of the part of the patient's eye.

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.

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).

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.

Generating an aspheric contact lens design for facilitating myopia control of a cornea of a patient includes operations of: obtain measurement for degree refractive error of the eye in diopters; obtain measurement of one or more biomechanical properties of the cornea; define a diameter of a central zone of the contact lens based on pupil size; select a base curve profile and width for the central zone based on the refractive error and the one or more biomechanical properties; define a width of a reverse zone adjacent to and encircling the central zone, the width being greater than 0.5 mm; select a reverse curve profile for the reverse zone compatible with the base curve profile; modify the base curve profile adjacent to the reverse zone by applying a selected base eccentricity curve profile for enhancing the tension force strength of the reverse zone; define a width of a relief zone of the contact lens adjacent to and encircling the reverse zone; select a relief curve profile for the relief zone; define a width of an alignment zone of the contact lens adjacent to and encircling the relief zone; select an alignment curve profile for the alignment zone; and define a width of a peripheral zone of the contact lens adjacent to and encircling the alignment zone; select a peripheral curve profile for the peripheral zone; wherein the compression force strength and the tension force strength of the contact lens cooperate to reshape corneal curvature in a mid-peripheral region to address the myopia control when the contact lens is applied to the eye.

The embodiment of the invention provides a lens module, intelligent wearable equipment and a working method thereof, relates to the technical field of display, and is used for inhibiting the development of ametropia. The lens module comprises a first electrode, a liquid crystal layer and a second electrode which are sequentially stacked, the lens module comprises a plurality of refraction units, and the lens module located in the refraction units has a first state and a second state. When the lens module located in the refraction unit is in a first state, a first angle is formed between at least part of liquid crystal molecules of the liquid crystal layer located in the refraction unit and the plane where the lens module is located, and the lens module located in the refraction unit has first refraction power. When the lens module located in the refraction unit is in a second state, at least part of liquid crystal molecules of the liquid crystal layer located in the refraction unit and the plane where the lens module is located form a second angle, and the lens module located in the refraction unit has second refraction power; wherein the first angle is different from the second angle, and the first refractive power is different from the second refractive power.

The invention provides a refractive error prediction method and device, electronic equipment and a storage medium, and the method comprises the steps: determining a target machine learning model from a plurality of candidate machine learning models based on a target group of target objects, the plurality of candidate machine learning models are obtained by pre-training based on a plurality of training sample data corresponding to the plurality of groups, and each training sample data comprises sample gene data, sample environment data and an ametropia risk tag; obtaining to-be-predicted data of the target object based on the target machine learning model; and inputting the to-be-predicted data into the target machine learning model to obtain a refractive error prediction result. The method can improve the refractive error prediction accuracy.

The invention relates to a planning method for generating control data, comprising an incision surface (10) with a cap incision (20), a side incision (30), a lenticular incision (40) and an access incision (50), for correcting the diopter of an eye (70). The object of the present invention is to provide a method and device for generating control data for correcting the diopter of an eye (70), which method and device can reduce the risk of dysfunction in the cornea (80) due to deformation. This object is achieved by a planning method that generates control data representing a process plan in which the outer cap cut (22) is implemented prior to the side cut (30), the side cut (30) is implemented prior to the lenticular cut (40), and the lenticular cut (40) is implemented prior to the inner cap cut (24). The object is also achieved by a corresponding planning unit (P), an ophthalmic laser treatment device (100) and a computer program product.

The invention discloses a refraction and diffraction type mixed multi-focus presbyopia correction contact lens, and belongs to the technical field of design and processing of optical lenses, the contact lens comprises a lens main body, the front surface of the lens main body is provided with a middle and near vision optical zone, a near and far vision diffraction optical zone and a far vision optical zone in sequence from the center to the periphery; the middle and near vision optical area is used for correcting presbyopia; the distant vision optical area is used for correcting ametropia; and the near and far vision diffraction optical areas are used for transitioning the far vision optical area and the middle and near vision optical area. On the basis of a traditional multi-focus soft lens, near vision is expanded to far vision, the field depth range is prolonged, light loss and optical interference are reduced, good visual comfort is provided, and better visual quality can be provided.

A device for treating refractive error of an eye includes an optical system having an optical zone and a peripheral defocusing optical structure for forming images of a plurality of stimuli in front of or behind a peripheral portion of the retina of the eye. In some embodiments, the peripheral defocusing optical structure is located outside the optical zone. In some embodiments, the peripheral defocusing optical structure has an optical power for focusing light to a depth different from the optical zone of the eye. In some embodiments, the optical system includes one or more of a lens, an optically transparent substrate, a beam splitter, a prism, or an optically transmissive support.

The application discloses a plane prescription microstructure closed-loop manufacturing system and process based on profile-wavefront applied to the field of optical manufacturing and measurement, obtains prescription parameters, manufacturing constraints and assembly constraints, generates a target two-dimensional phase field and height field and initializes manufacturing control parameters, obtains profile measurement and wavefront measurement data at the manufacturing-measurement acceptance link, calculates wavefront RMS and refractive error vectors, executes defect detection and reason code classification, carries out error attribution and backfills two-dimensional dose field, focal point offset, LUT / FEM and other control quantities, and outputs an acceptance report and a traceable data package and solidifies a version when a threshold is met, so that the yield of mass production and the cross-site consistency are improved, and the quality traceability and the ability to provide evidence for disputes are strengthened.