53results about "Refractometers" patented technology

Systems and methods are provided for improving overall vision in patients suffering from a loss of vision in a portion of the retina (e.g., loss of central vision) by providing symmetric or asymmetric optic with aspheric surface which redirects and / or focuses light incident on the eye at oblique angles onto a peripheral retinal location. The intraocular lens can include a redirection element (e.g., a prism, a diffractive element, or an optical component with a decentered GRIN profile) configured to direct incident light along a deflected optical axis and to focus an image at a location on the peripheral retina. Optical properties of the intraocular lens can be configured to improve or reduce peripheral errors at the location on the peripheral retina. One or more surfaces of the intraocular lens can be a toric surface, a higher order aspheric surface, an aspheric Zernike surface or a Biconic Zernike surface to reduce optical errors in an image produced at a peripheral retinal location by light incident at oblique angles.

A method for estimating refraction of an eye of an individual, including: a) providing a set of N acquired eccentric photorefraction images of the eye, b) setting values for a set of parameters including at least sphere, c) providing a set of N simulated eccentric photorefraction images, d) determining an estimator of a difference between the set of N acquired eccentric photorefraction images and the set of N simulated eccentric photorefraction images, e) performing an optimization using an optimization algorithm so as to optimize the estimator by adjusting values for the set of parameters and iterating steps c) and d), and f) deducing an estimation of at least one refraction parameter of the eye.

The application discloses a campus vision screening data visualization and regional prevention and control strategy generation system, comprising: a data acquisition unit for acquiring campus student vision screening core data, eye environment data, individual behavior data and regional public health resource data; a data preprocessing unit in communication connection with the data acquisition unit, for cleaning, fusing and feature extraction of the collected multi-source heterogeneous data. The application overcomes the technical problems of existing campus vision screening system, such as data isolation, single visualization form, extensive prevention and control strategy, unbalanced regional resource allocation, insufficient privacy protection and lack of iterative optimization mechanism, and provides an intelligent system integrating data acquisition, preprocessing, spatio-temporal visualization, risk assessment, hierarchical strategy generation, interactive output, privacy protection and iterative optimization, so as to realize data management, visualization, analysis, strategy generation and efficiency evaluation, and improve the accuracy of campus myopia prevention and control and the efficiency of regional management.

The application discloses a diopter-adjustable and real-time retina imaging detection simulation eye, comprising: an emulated cornea, an emulated lens and an adjustable vitreous structure arranged in sequence along an optical axis; the adjustable vitreous structure comprises: a vitreous cavity filled with an emulated vitreous, a curved retina arranged at the end of the vitreous cavity, and a micrometer adjustment system for driving the curved retina to move forward and backward along the optical axis; the foveal region of the curved retina is integrated with an attenuation module and an imaging module, which are used for collecting a light spot image on the foveal region in real time; the simulation eye further comprises an analysis module electrically connected with the imaging module, and the analysis module is configured to process the collected light spot image to extract optical parameters on the curved retina.

An ophthalmologic apparatus includes a visual-target presenting portion (41) that is configured to present visual targets (8) to left and right subject eyes (EL, ER), respectively; and an objective measurement optical system (6, 7) that is configured to objectively measure eye characteristics of the left and right subject eyes (EL, ER), respectively. The visual-target presenting portion (41) is configured to present the visual targets (8) while changing a convergence position (R, R1, R2), where two lines of sight (SL1, SR1, SL2, SR2) from positions of the left and right subject eyes (EL, ER) intersect, with pinhole plates (50) respectively disposed at positions conjugate with pupils of the left and right subject eyes (EL, ER). The objective measurement optical system (6, 7) is configured to obtain the objective refractive values of the left and right subject eyes (EL, ER), respectively, under a condition where the pinhole plates (50) are respectively disposed by the visual-target presenting portion (41) and the visual targets (8) presented at the convergence position (R, R1, R2) are binocularly fused.

The present invention relates to an apparatus (110) and a method (210) configured to determine a choroidal topography (218) on a region (114, 114') of the retina (116) of a human eye (117), and to the use of the apparatus (110) for determining the effect of at least one ophthalmic lens design on the choroidal topography (218). In this document, the device (110) includes: - at least two separate displays (122, 122'), each configured to provide retinal stimulation (112, 112'), thereby providing two independent retinal stimuli (112, 112'); - at least two optical transmission elements, including a first optical transmission element and a second optical transmission element, each configured to project at least one of the retinal stimulation (112, 112') or a phase map onto a region of the retina of a human eye, wherein the phase map includes a modified retinal stimulation; - a measuring device (142) for capturing a human eye by using reflected light received from a region (114, 114') on the retina (116) of the human eye (117). (117) Choroidal topography (218) on region (114, 114') of retina (116); - Optical filter (152) configured to separate reflected light received from region (114, 114') of retina (116) of human eye (117) from phase map of region (114, 114') of retina (116) of human eye (117), wherein the second optical transmission element is further configured to simultaneously project each of the at least two separate phase maps at different retinal eccentricities onto each of at least two separate regions (134, 134') of retina (116) of human eye (117), wherein these separate regions (134, 134') include peripheral region and foveal region of retina (116) of human eye (117).

There are provided an ophthalmic device capable of examining on a subject eye by an examination head without bringing the examination head closer to a nose of a subject and a method for operating the ophthalmic device. The ophthalmic device includes a displacement mechanism (an XZ movement mechanism (16), a Y movement mechanism (18), a swing rotation mechanism (20), and a tilt rotation mechanism (80)) configured to displace an examination head (66) with respect to a subject eye (E), a nose photographing controlling unit (41) configured to cause at least two cameras (34a) to photograph a nose of a subject from a plurality of directions different from each other, a nose position detecting unit (42) configured to detect a position of the nose (N) based on respective photographed images of the nose (N) from the cameras (34a), a tilting angle determining unit (43) configured to determine a tilting angle (θ) of an axis (TA) of tilt with respect to a reference axis (VA) based on a result of detection by the nose position detecting unit (42), and a drive controlling unit (46) configured to drive the displacement mechanism to displace the examination head (22) to an examination position for the subject eye (E) along the axis (TA) of tilt with the tilting angle (θ) determined by the tilting angle determining unit (43).

A vision screening device for administering vision screening tests to a patient, and in particular vision screening test(s) to determine the presence of diseases and / or abnormalities in the eye(s) of the patient, is described herein. The vision screening device is used to determine an order for performing various vision screening exams selected by a clinician for a patient in a compact timeframe and reduce time needed for pupil recovery between exams or other delays. The vision screening device captures visible and near infrared reflections from the patient and generates a composite image used for generating suggested diagnoses to a clinician via a display of the vision screening device.

Ophthalmic observation device which features: an optical photography system comprising a first focusing lens and performing photography to capture a front image of an eye; an optical measuring system that includes a second focusing lens and performs optical coherence tomography (OCT) to capture a cross-sectional image of the eye; an optical path coupler that couples the optical paths of the optical photography system and the optical measuring system at one point on the eye side of the first and second focusing lenses; a first drive to move the first focusing lens along an optical axis of the optical photography system; a second drive for moving the second focusing lens along an optical axis of the optical measuring system; and a control system that individually controls the first and second drives, wherein the optical measurement system OCT performs the acquisition of a cross-sectional image of the fundus of the eye, and which further comprises: an optical projection system that projects a focusing index onto the fundus as an indication of a focus state of the optical photography system on the fundus; and an intensity reference element that references the intensity of an interference signal detected by the optical measurement system, wherein After focusing the optical photography system and focusing the optical measuring system based on the focusing index, the control system controls the second drive based on the intensity referenced by the intensity reference element. wherein the controller acquires multiple interference signals corresponding to multiple positions of the second focusing lens by controlling the optical measuring system while controlling the second drive to move the second focusing lens, has a fourth target position reference part which obtains a target position of the second focusing lens based on intensities of the multiple interference signals obtained by the intensity reference part, and controls the second drive to move the second focusing lens to the obtained target position.

The utility model belongs to the technical field of ophthalmic medical instruments, disclose a kind of ophthalmic automatic platform shaft locking mechanism, including fixed base, its upper surface one side fixed mounting mount, the output shaft end of mount is fixedly installed screw rod, the other side fixed mounting motor is installed on the upper surface of fixed base, the screw rod is rotated and is connected in the inside of connecting hole far from mount side, locking block is slidably connected in the inner wall of mount, the lower end of the inner wall of mount is hinged with the lever, the upper end of the lever is in contact with the lower wall of locking block, the utility model proposes a kind of ophthalmic automatic platform shaft locking mechanism, by pushing lever, in the process of lever rotation, its upper end is extruded to the lower wall of locking block, the lower wall of locking block is forced to move upward, so as to be pressed by the outer wall of screw rod by the upper end of locking block, so as to lock the automatic platform shaft, so as to greatly reduce the equipment shaft jamming phenomenon by absorbing equipment impact, greatly reduce equipment failure and after-sales cost, improve customer satisfaction.

To make personal identification of a subject difficult while allowing checking of the subject's eyes.SOLUTION: An ophthalmological apparatus for use in examining a subject's eye, comprises: captured image acquiring means for acquiring a captured image containing the face of the subject including the subject's eye; and processing means. The processing means acquires and outputs a processed image including an eye region, the processed image being generated by dividing the captured image into an eye region (which includes at least the pupil of the subject's eye) where the subject's eye is present and an unnecessary region which is not necessary for the examination, and by applying processing to the unnecessary region so that personal identification of the subject is impossible. The processing means acquires a processed image including the eye region by applying either of first processing to cut out the eye region from the captured image, and second processing to make visual identification of a feature unique to the subject difficult, to the unnecessary region.SELECTED DRAWING: Figure 8

To acquire a more accurate and more appropriate measurement result.SOLUTION: An ophthalmologic measuring device includes: a measurement optical system for projecting measurement light onto the ocular fundus of an eye to be examined and causing a light receiving element to receive reflection light of the measurement light from the ocular fundus of the eye to be examined; a conversion member disposed at a pupil conjugate position of the eye to be examined in the measurement optical system for converting the reflection light from the ocular fundus into a multiplex ring image and causing the light receiving element to receive the multiplex ring image; limiting means having a limiting member arranged at a conjugate position of the conversion member or in the vicinity of the conversion member for changing a measurement region in the eye to be examined by limiting a part of the ring image received by the light receiving element by a limiting member; limit control means for controlling the limiting means and changing the measurement region in the eye to be examined that is changed by the limiting member in at least two or more patterns; and processing means for processing the ring image received by the light receiving element to acquire eye refractive power information.SELECTED DRAWING: Figure 2

The present invention relates to a method (210) for determining at least one refractive value (212) of a human eye (112), a computer program and determining device (110), a data carrier signal, a field device for generating input data (214) for determining at least one refractive value (212) of a human eye (112), a remote device for generating result data (222) for determining at least one refractive value (212) of a human eye (112), a method for generating a geometric model (226) of at least one spectacle lens (228) for producing at least one spectacle lens (228), and a method for producing at least one spectacle lens (228). In this paper, the method (210) includes the following steps: a) generating input data (214) configured to include uncorrected distance visual acuity (216) of a human eye (112); the astigmatic meridian direction (220) of the human eye (112); and the distance (140) between the human eye (112) and at least one visual stimulus (118) displayed to the human eye (112), wherein the at least one visual stimulus (118) is aligned simultaneously in the astigmatic meridian direction (220) and in a direction perpendicular to that direction; b) generating a result The result data (222) is configured to include at least one refractive value (212) of a human eye (112), wherein the at least one refractive value (212) of the human eye (112) is determined by evaluating input data (214), wherein the distance (140) between the human eye (112) and at least one visual stimulus (118) is determined based on the human's response indicating that the human has perceived that the at least one visual stimulus (118) has equivalent blurring in the astigmatic meridian direction (220) and in a direction perpendicular to that direction. The present invention provides a rapid, simple, universal, reliable, and accurate method for determining at least one refractive value (212) of a human eye (112).

To reduce the problem of information unnecessary for examination being shown on a display screen.SOLUTION: An ophthalmologic apparatus having an eye examination part for examining an eye to be examined includes: illumination means for irradiating a subject with illumination light; imaging means for acquiring a captured image by imaging the subject; display means for displaying the captured image; and control means. The control means generates overexposure in the captured image displayed in the display means by raising at least one of an illumination light volume of the illumination means and a gain of the imaging means in alignment of the eye examination part with respect to the eye to be examined, for the illumination light volume of the illumination means and a gain of the imaging means applied when examining the eye to be examined.SELECTED DRAWING: Figure 8

The present application relates to improved ocular aberrometry systems and methods. Techniques are disclosed for systems and methods for providing improved ocular aberrometry measurements. An ocular aberrometry system (100) includes a wavefront sensor (120) configured to provide wavefront sensor data associated with an optical target (102) monitored by the ocular aberrometry system (100) and a logic device (140) configured to communicate with the wavefront sensor (120). The logic device (140) is configured to receive (502) ocular aberrometry measurement output data including at least wavefront sensor data provided by the wavefront sensor (120), determine (504) an estimated eye alignment deviation corresponding to a relative position and / or orientation of the optical target (102) monitored by the ocular aberrometry system (100) based at least in part on the received ocular aberrometry measurement output data, and generate (508) user feedback corresponding to the received ocular aberrometry measurement output data based at least in part on the estimated eye alignment deviation.

To improve the precision of ophthalmic surgical procedures by reducing corneal wrinkling, a patient interface for an ophthalmic system can include an attachment portion, configured to attach the patient interface to a distal end of the ophthalmic system; a contact portion, configured to dock the patient interface to an eye; and a contact element, coupled to the contact portion, configured to contact a surface of a cornea of the eye as part of the docking of the patient interface to the eye, and having a central portion with a central radius of curvature Rc and a peripheral portion with a peripheral radius of curvature Rp, wherein Rc is smaller than Rp.

Methods and systems for planning and performing a corneal laser ablation procedure that may comprise a wavefront aberrometer and a corneal topography measuring device. Data from each of these devices may be compared for generating an astigmatism treatment to be incorporated into a laser ablation treatment map. Corrections derived from epithelial thickness measurements may also be incorporated into the treatment map.

This invention provides a retinoscope bulb filament imaging motion structure, including an observation film housing assembly, a dustproof lens housing assembly, a rotating lamp holder assembly, and a lamp wick assembly. The rotating lamp holder assembly includes a condenser lens mount, a head connector, a lamp holder clamping sleeve, a lamp holder clamping pin, an elastic slip ring, a focus adjustment limiting pin, a lamp cover, a light-shielding bearing, and a condenser lens. The lamp wick assembly includes a lamp holder, an insulating post, a core, and a bulb. The lamp holder has circumferentially distributed grooves, and the lamp holder clamping sleeve has matching bosses, with the grooves and bosses circumferentially positioned and engaged. The lamp holder clamping sleeve has a racetrack-shaped elongated groove, and the cylindrical end of the focus adjustment limiting pin passes through this racetrack-shaped elongated groove to form an axial guiding engagement. The outer surface of the elastic slip ring has elastic protrusions that elastically abut against the inner wall of the condenser lens mount. The lamp wick assembly of the retinoscope bulb filament imaging motion structure provided by this invention can be pulled out as a whole, facilitating bulb replacement.

This invention discloses an ophthalmic device, including a movable chassis, a main unit integrating vision testing and refractive error detection functions, and a main unit drive mechanism. The main unit includes a main unit housing, a main unit cover, and a cover drive mechanism. The ophthalmic device has vision testing and refractive error detection functions and is equipped with a movable base. The entire device can be moved to designated locations as needed, facilitating use, especially in schools where it can be moved sequentially to each classroom for vision checks, avoiding queuing and congestion, and improving examination and testing efficiency. The main unit can be raised and lowered relative to the movable chassis, and the main unit cover can be raised and lowered relative to the main unit housing. The viewing window is located on one side of the main unit cover, thus enabling two-stage height adjustment to meet the examination and testing needs of users of different heights. Therefore, no external lifting drive mechanism is needed to move the entire ophthalmic device up and down, freeing up the device for transfer between different locations for examination and testing.

The present application relates to the field of ophthalmic optometry, and particularly relates to an analysis and measurement device and method for diopter of human eye. By synchronously collecting timing signals of diopter and pupil diameter, effective measurement points are screened based on change rate; initial diopter baseline and individual physiological benchmark are established, continuous fixation segments are extracted and static accommodation physiological cost is calculated; from the continuous fixation segments, fluctuation sequences of diopter and pupil oscillation sequences of preset frequency band are extracted, and the dynamic accommodation asynchronization coefficient is obtained by analyzing the different step strength of the two; the ciliary muscle tension index is obtained by fusing the static accommodation physiological cost and the dynamic accommodation asynchronization coefficient, and the initial diopter baseline is compensated based on individual physiological difference mapping into accommodation compensation. The present application can capture the dynamic characteristics in the accommodation spasm state through frequency domain correlation analysis, realize non-invasive and objective separation of pseudo myopia components, and has the advantages of strong anti-interference ability and individual self-adaptation.

A method of determining binocular alignment includes measuring an uncoupling phoria of a patient at a first simulated distance by: presenting a fusible image including a target having a first disparity corresponding to the first simulated distance using a stereoscopic display of a head-mounted device at a screen distance; presenting the target having the first disparity for a first eye and presenting an uncoupling null target image for a second eye to present a non-fusible image, and measuring an uncoupling phoria in response to the presentation of the non-fusible image using an eye tracker of the head-mounted device; and including determining a vergence of the patient at the first simulated distance by: presenting a fusible image having the first disparity corrected for the measured uncoupling phoria for the first and second eyes; measuring a coupling phoria in response to the presentation of the fusible image; and determining the vergence as a combination of the uncoupling phoria and the coupling phoria.

The application discloses a multi-modal context perception control method, belonging to the technical field of intelligent wearable devices and intelligent optical control. The method realizes the global adaptive control of intelligent optical devices through the synchronous acquisition of four modal data of optical environment perception, eye physiology perception, user behavior perception and scene semantic perception, the spatio-temporal fusion of context features, lightweight AI decision, high-molecular nano low-loss transmission and high-precision closed-loop feedback. The application solves the technical pain points of traditional intelligent devices, such as single perception, control lag, large transmission loss, poor environmental adaptation, no context understanding and the like, realizes 10-second full-automatic optometry, 180ms focusing response, a steady-state error of less than or equal to 0.10D, a transmission loss of less than or equal to 3%, and an optometry accuracy of more than 98.8%, and can be widely applied to adaptive focusing intelligent glasses, intelligent optical lenses, medical eye health devices, AR / VR optical systems and the like. The application is unique, practical and has a comprehensive performance beyond international similar technologies, and has a high property right value and engineering application value.

A method includes measuring an eye of a patient according to a plurality of imaging modalities to obtain a plurality of measurements, such as an OCT image, aberrometer measurement, or visible light image. The measurements are processed to obtain a characterization of lens scattering and a characterization of lens accommodation. A dysfunctional lens syndrome score is calculated for the lens according to the characterizations of lens scattering and accommodation and the dysfunctional lens syndrome score is output.

Systems and methods are provided for eye health and vision examinations. A customer diagnostic center is configured to generate customer examination data pertaining to an examination of a customer's eye. The customer diagnostic center provides a user interface for communicating with a customer and ophthalmic equipment for administering tests to the customer. A diagnostic center server is configured to receive the customer examination data from the customer diagnostic center over a network and allow the customer examination data to be accessed by an eye-care practitioner. A practitioner device associated with the eye-care practitioner is configured to receive the customer examination data from the diagnostic center server and display at least a portion of the customer examination data to the eye-care practitioner. Customer evaluation data is generated pertaining to the eye-care practitioner's evaluation of the customer examination data. An eye health report is provided to the customer via the network.

An ophthalmic apparatus and a control method of an ophthalmic apparatus are disclosed. The ophthalmic apparatus includes a refractive power measuring optical system, a fixation projection system, an examination optical system, and a control section. The refractive power measuring optical system includes a first focusing element whose focal position is changeable, and projects first light toward a subject eye, and detects return light of the first light from the subject eye by means of the first focusing element. The fixation projection system projects a fixation target toward the subject eye. The examination optical system includes a second focusing element whose focal position is changeable in conjunction with the first focusing element, and is used to perform a prescribed examination of projecting second light toward at least the subject eye by means of the second focusing element. The control section controls the first focusing element and the second focusing element in accordance with a detection result of the return light, and after performing the prescribed examination based on the examination optical system, controls the fixation projection system to perform a refractive power measurement using the first light in a state of inducing fogging of the subject eye.

A vision screening device for administering vision screening tests to a patient, and in particular vision screening test(s) to determine visual acuity results for eyes of a patient, is described herein. The vision screening device includes a sensor and a patient-facing display. The vision screening device is configured to receive input indicative of a selection of a predetermined distance for a visual acuity exam; determine, based on data from the sensor, a distance to a patient; determine an instruction for display at the second display to cause the distance to be within the threshold distance of the predetermined distance. The vision screening device is also configured to determine, based on the predetermined distance, a size for one or more digital objects of an optotype, and record responses to a visual acuity exam for determining a visual acuity response.

Method for detecting astigmatism based on a visual detection of the eyes (1) of a person, characterized in that an in-vehicle computing unit determines a degree of astigmatism by comparing a reflection (3) of the environment extracted from a corneal reflection image (CRI) of a vehicle occupant (2) with an environment camera image (4), wherein the corneal reflection image (CRI) and the environment camera image (4) show at least partially the same section of the environment, wherein the computing unit performs the following process steps: - Recording of the eye area of ​​the vehicle occupant (2) using an interior vehicle camera; - Extracting the corneal reflection image (CRI) from the camera image captured by the internal camera; - Determining the position of the eyes (1) of the vehicle occupant (2) relative to the vehicle interior and determining the direction of gaze (5) of the vehicle occupant (2) by processing the camera image recorded by the interior camera; - Generating the surround view camera image (4) using a vehicle-integrated surround view camera (10); - Taking into account the installation position and orientation of the interior camera and the surround camera (10) on the vehicle as well as the position of the eyes (1) and the direction of gaze (5): Overlay at least a subset of the image content of the corneal reflection image (CRI) and the surround camera image (4); - Segmentation of the corneal reflection image (CRI) into a multitude of image segments (6); - Performing an image registration for each image segment (6) onto the superimposed image content of the ambient camera image (4), whereby each image segment (6) is assigned a similarity value; and - Determining the degree of astigmatism depending on the similarity values ​​assigned to each image segment (6).

The utility model relates to ophthalmic optometry instrument technical field discloses a kind of comprehensive optometry instruments for ophthalmology, including base, the base top is fixedly connected with optometry device, the base side wall is fixedly connected with support frame, the support frame top is provided with support assembly, the support frame top is fixedly connected with hollow board, the hole is opened in the hollow board inside, and the hollow board inner wall is provided with adjusting assembly;The adjusting assembly includes sliding column, the sliding column outer wall slidingly connected in hollow board inside, the sliding column side wall is fixedly connected with forehead support, and the sliding column inside is provided with first spring.In the utility model, forehead support is pulled to drive sliding column to move, sliding column drives first spring to move, since first spring will ball be stuck in hollow board, the height of forehead support cannot be adjusted, the patient with big height difference is forced to stick to equipment with unnatural posture, leading to neck muscle fatigue Problem, improve the diversity of comprehensive optometry instruments for ophthalmology.