94 results about "Fundus camera" patented technology

The invention provides a fundus camera system integrated with adaptive optics and a correction method, and relates to the technical field of ophthalmology imaging. The fundus camera system comprises a beacon light source, an imaging light source and an imaging sensor; the device comprises a wavefront sensor, a wavefront correction device and a control module, and the wavefront correction device comprises a focusing lens group and a deformable reflector; the focusing lens group and the deformable reflector are arranged in the same light path from the beacon light source to human eyes and from the human eyes to the wavefront sensor; moreover, the control module executes a two-step closed-loop control strategy of first focusing and second correction: firstly, based on a first measurement result of the wavefront sensor, the focusing lens group is driven to move so as to compensate low-order aberration; and after the focusing is completed, the deformable reflector is driven to deform based on the subsequent measurement result of the wavefront sensor so as to compensate the high-order aberration in a closed-loop manner. On the basis of inheriting the advantage of rapid focusing in the prior art, the self-adaptive optical technology is further integrated, so that the limitation of high-order aberration on resolution is solved.

The invention provides a three-dimensional eyeball form noninvasive evaluation method and system based on multi-modal fundus features, and relates to the technical field of medical image analysis, and the method comprises the steps: obtaining a color fundus image through a non-contact fundus camera, and collecting the equivalent spherical power, age and gender data of a patient; segmenting the image by using a U-Net network, extracting various geometric and blood vessel features, correcting the image and normalizing data; eliminating diopter interference by adopting a mixed effect linear regression model, and screening target features; related parameters are calculated based on the MRI image, and a deep learning model is used for training prediction; inputting to-be-evaluated data to obtain a result, evaluating the myopia complication risk according to the result, and providing personalized eye health management suggestions. According to the method, through combination of multi-mode fundus feature analysis and deep learning, non-invasive, low-cost and high-precision three-dimensional eyeball shape evaluation is realized, the myopia complication risk can be effectively predicted, and a personalized eye health management scheme is provided.

The utility model discloses a fundus camera convenient to adjust a chin rest, which comprises a base, the upper surface of the base is fixedly connected with two supporting columns, the top ends of the two supporting columns are fixedly connected with a supporting plate together, the upper surface of the supporting plate is fixedly provided with a fundus camera body, the upper surface of the base is provided with a groove, and the upper surface of the groove is provided with a clamping groove. And a positive and negative rotation motor is fixedly mounted on the inner side wall of the groove. According to the device, firstly, the electric push rod is arranged, the electric push rod can drive the cheek supporting frame body to ascend and descend, so that a worker can conveniently adjust the height of the cheek supporting frame body, and then the positive and negative rotation motor is arranged and can drive the threaded rod to rotate; in this way, the threaded block can drive the connecting block and the sliding plate to slide front and back through rotation of the threaded rod, the electric push rod and the chin rest body can be driven to slide front and back through the sliding plate, and therefore a worker can conveniently adjust the front-back position of the chin rest body.

The application provides an ophthalmic image diagnosis method and system based on multi-modal imaging cooperation, and relates to the technical field of medical image diagnosis. First, the OCT, fundus camera and ultrasonic original image data of an ophthalmic examination object are acquired, and multi-modal dynamic correlation mapping results are obtained through dynamic correlation and trend correlation processing. Cross-modal lesion feature progressive mining and interactive verification are performed to obtain a cross-modal lesion correlation feature set. Multi-modal cooperative diagnosis reasoning and weight feedback optimization are used to generate an ophthalmic disease reasoning result containing disease types, lesion dynamic distribution and reasoning confidence. Finally, an ophthalmic diagnosis report with dynamic labeling and confidence explanation is generated. The application comprehensively utilizes the advantages of various image technologies to improve the accuracy of ophthalmic image diagnosis.

The application discloses a fundus photograph classification system based on deep mutual learning. The application fuses two kinds of anomaly detection algorithms of Ganomaly and FastFlow, constructs a detection model which is adaptive and robust to various eye diseases, effectively solves the problem that artificial intelligence cannot be used for intelligent diagnosis of a disease due to the lack of abnormal samples of the disease in practical application, improves the universality and accuracy of the disease detection model, saves the precious time of doctors, and improves the diagnosis efficiency of patients. In addition, the detection method can be applied to a fundus camera, and the device plays a great role in the initial screening stage of eye diseases. With slight cost, the device solves the problem that early eye diseases of patients are difficult to be found due to objective reasons such as insufficient medical resources and lack of experienced doctors, and truly helps community and primary hospitals to realize early discovery, early diagnosis and early treatment, so that the tragedy of blindness caused by delayed treatment due to late discovery is avoided.

An ophthalmic apparatus comprises a visible light illumination channel, which illuminates a retina of an eye of a patient under examination by visible light. A near-infrared illumination channel illuminates the retina of the eye of the patient under examination by near-infrared light. An imaging channel receives light from the retina of the eye illuminated by the visible light and / or the near-infrared light. A target channel outputs fixation image content to a patient whose eye is under the examination for fixation of a gaze direction of the patient. An alignment arrangement illuminates the anterior part of the eye and reflections therefrom are received by two of a fundus camera sensor and a first and second pupil camera sensors. A data processing unit determines an optimal positional alignment of the eye for imaging a fundus of the eye by a fundus camera sensor based on still image and / or video capture of the anterior part of the eye.

The utility model discloses a lens clamping ring structure and a fundus camera, relates to the technical field of optical lenses and precision assembly, and discloses a lens clamping ring structure, which comprises a first eyepiece lens, a second eyepiece lens and an eyepiece group space ring, the first eyepiece lens, the eyepiece group space ring and the second eyepiece lens are coaxially arranged from front to back in sequence; and the inner side of the eyepiece group space ring is provided with a dip angle for changing the light path of the reflection light spot. By adjusting the inclination of the interior of the lens space ring, the reverse light spots can be directionally reflected to other structure areas, the reverse light spots are prevented from entering an optical system, and the imaging quality of a photo CCD is improved.

The application relates to an ophthalmic multimodal imaging joint calibration device and a calibration method. The device comprises a variable diaphragm, an eye simulation lens, a water room and a calibration plate. The eye simulation lens is placed at the best working distance of the calibrated equipment. The variable diaphragm is placed in front of the front surface of the eye simulation lens, and the light aperture of the variable diaphragm can be adjusted at will. The calibration plate is placed at the back focal plane of the eye simulation lens, and a calibration pattern is drawn on the front surface of the calibration plate. The front surface of the calibration plate, the rear surface of the eye simulation lens and the water room form a closed space, and the inside can be injected with liquid. The application is mainly used for joint imaging calibration of fundus camera equipment and ophthalmic OCT equipment, and solves the problem of poor spatial matching of imaging data when two modal instruments are used for joint imaging.

The present disclosure relates to an optical system of a fundus camera with a light barrier, which comprises an illumination device, a first optical assembly, a second optical assembly, an imaging device and a positioning device; the illumination device comprises an illumination light source; the first optical assembly comprises a first half-transmission half-reflection mirror, a first polarizer, a second half-transmission half-reflection mirror and a retinal objective lens, the first optical assembly directs the light beam from the illumination light source to the fundus of the eye to be examined, and guides the reflected light of the fundus to the second optical assembly; the second optical assembly comprises a second polarizer and a focusing module, the focusing module guides the reflected light to the imaging device; the imaging device receives the light from the second optical assembly to form the fundus image; the positioning device comprises a guiding light source and a light barrier, the light beam of the guiding light source has a preset shape after passing through the light barrier, the imaging device acquires the fundus images of different regions of the eye to be examined based on the guiding light source, and the first optical assembly directs the light beam of the guiding light source to the fundus of the eye to be examined for imaging.

A method of validating alignment of an image sensor of a camera and an illumination projection for use in a system for automatically aligning a camera device which includes the camera, wherein the cam

The present invention discloses a retinal fixation training method and device based on fundus images, belonging to the field of retinal training technology, comprising the following steps: S1: adjusting a fundus camera to obtain a real-time fundus image of a patient based on the fundus camera; S2: processing the real-time fundus image of the patient to determine a fundus feature image of the patient; S3: analyzing and evaluating the fundus feature image of the patient to determine the fundus image analysis and evaluation result; S4: performing intelligent retinal fixation training on the patient; and S5: optimizing and adjusting the retinal fixation training program based on patient feedback and suggestions. The present invention solves the problem that existing personalized retinal fixation training programs cannot be formulated for patients based on fundus images, resulting in poor retinal fixation training results for patients. The present invention can formulate personalized retinal fixation training programs for patients based on fundus images, thereby improving the retinal fixation training results for patients.

The present application relates to a kind of portable large field of view fundus camera optical system, which uses four-piece as retinal objective, improves Gaussian mirror group as imaging mirror group, uses secondary imaging, and the retina is first imaged in the center of the system through retinal objective, and the central image is finally imaged in CMOS sensor through focusing mirror group and imaging mirror group, and finally clear fundus image is obtained. At the same time, a flat-concave lens is used as the focusing lens in the Gaussian mirror group. The optical design of the system is simple in structure, low in manufacturing cost, and compared with the portable fundus camera on the market, the number of lenses is less, and no aspherical mirror is used to meet the requirements of large field of view and wide range of focusing. The system length is less than 190mm, which meets the requirements of portability.

This application discloses a driving device, belonging to the field of fundus camera technology. The coupling and drive motor of the driving device can be integrated into two mounting positions of a bracket, respectively. Therefore, during bracket manufacturing, the preset positional accuracy of the two mounting positions can be easily controlled. After the drive motor is fixed to the bracket, the output shaft is inserted into the second connecting hole of the coupling. Simultaneously, during bracket manufacturing, the preset positional accuracy of the drive screw's mounting position relative to the first and second mounting positions can also be controlled. Furthermore, while leaving an assembly gap between the first end of the drive screw and the first connecting hole of the coupling, the two sets of snap-fit ​​surfaces are engaged. Thus, after the drive motor and coupling are assembled, the first end of the drive screw can be inserted into the first connecting hole, eliminating the need for repeated adjustments to the assembly accuracy between the coupling and the screw, reducing the number of assembly parts and lowering assembly costs.

A device has a light guide portion and a light collector portion. The light guide portion is cup shaped. The wall of the cup has a cross section defined by sections of two ellipses disposed in a predefined manner with each other. The light collector portion is also cup-shaped, inverted with reference to the light guide portion, by a section of an ellipse and straight lines defined with reference to the light guide portion. The device radiates an annular illumination at the rim of the cup through total internal reflection of light from an LED, collected by the light collector portion. The device is made of a clear, colourless, substantially transparent material by injection moulding, one example being Polycarbonate. An annular light source system and a fundus camera using such a system are also disclosed.

The techniques described herein relate to fundus imaging systems with automatic image capture. An example method for fundus imaging comprises aligning an image path of a fundus camera to an eye pupil of a subject, iteratively executing an autofocus function to determine a plurality of first diopter values, adjusting a focus of a lens of the fundus camera in accordance with a second diopter value, the second diopter value identified from the plurality of first diopter values or determined from the plurality of first diopter values, and capturing, after adjusting the focus of the lens in accordance with the second diopter value, a fundus image of a retina of the subject.

The invention discloses a use method of a scanning splicing large-view-field fundus phase imaging device. The scanning splicing large-view-field fundus phase imaging device comprises an illumination light path and a zoom light path. The illumination light path comprises a scanning mirror, a spectroscope and a fundus objective lens, the front side of the scanning mirror is a collimation light source, the rear side of the scanning mirror is the spectroscope, the left side of the spectroscope is the fundus objective lens and a patient fundus, and the right side of the spectroscope is a zoom lens group of a zoom light path and a fundus camera. The scanning mirror is rotated and the focal length of the zoom lens group is adjusted in sequence according to the plurality of scanning sequence groups, so that the fundus camera acquires a plurality of groups of positive defocus state, focusing state and negative defocus state images, then a plurality of local fundus phase diagrams are obtained according to the images, and a complete fundus phase distribution diagram is obtained, namely, the fundus phase distribution diagram has the phase information acquisition capability; and observing microscopic important pathological features according to the fundus phase distribution diagram. Therefore, the design has the capability of acquiring phase information, and microscopic important pathological features can be observed.

A non-invasive device for detecting Alzheimer's Disease-associated pathologies, comprising a fundus camera comprising a spectral reflectance imaging unit that includes a broadband light source and a light sensor and a lens assembly to focus light from the broadband light source onto a fundus of an eye, and one or more processors to detect reflected and / or backscattered light from the eye, illuminated by the broadband light source, using the light sensor for determining spectral reflectance information, generate a plurality of spectral reflectance maps comprising counts of reflected and / or backscattered light at a different wavelength or a different range of wavelengths, assign a weight to each of the spectral reflectance maps, and determine one or more regions of interest from the weighted spectral reflectance maps as being a potential Alzheimer's Disease-associated pathology based on a detection of one or more biomarkers indicative of Tauopathy.

The utility model discloses a diopter illumination compensation structure and a fundus camera, and relates to the technical field of medical equipment.The diopter illumination compensation structure comprises a base, a diaphragm assembly and a driving assembly; a movable sliding groove is concavely formed in one end surface of the base; the diaphragm assembly is accommodated in the movable chute; the driving assembly is fixedly arranged on the base; the driving assembly comprises a driving part which is in driving connection with the diaphragm assembly and used for driving the diaphragm assembly to have a movement stroke in the movable sliding groove in the first direction. According to the technical scheme, the diaphragm assembly is contained in the movable sliding groove, meanwhile, the driving part is in driving connection with the diaphragm assembly and used for driving the diaphragm assembly to have the movable stroke in the movable sliding groove in the first direction, in this way, the illumination range can be adjusted to be matched with the imaging position, and then fundus photos with even illumination are obtained; in other words, displacement adjustment of the illumination diaphragm hole can be achieved structurally, so that complete and uniform illumination can be achieved for imaging under different diopters.

The application relates to the technical field of contrast auxiliary devices, and discloses an eye fundus imaging device positioning auxiliary device which comprises a supporting base, a guide rod is fixedly installed at the top of the supporting base, a rotating shaft three is driven to rotate through a rotating knob, the rotating shaft three drives an umbrella-shaped tooth two to mesh with a conical tooth two to rotate, the rotating shaft two, the conical tooth one and the umbrella-shaped tooth one are matched with synchronous transmission, power is transmitted to a rotating shaft one, a convex connecting pin is lapped through electromagnetic coil magnetization iron core adsorption, then the double worm gears synchronously mesh with the worm wheel to drive the transmission screw rod, so that the different patient height adaptation requirements are realized, secondly, the rotating knob is matched with another group of electromagnetic coil magnetization iron core adsorption convex connecting pin lapping, the fixed shaft and the gear are driven to rotate, the gear meshes with the rack to drive the inclined block two to slide, the arc-shaped supporting plate is pushed to adjust the posture, then the eye fundus imaging eye position is matched, so that the cumbersome process of multiple operation piece switching is avoided, and the demand of multiple eye position examination is met.

The utility model discloses a self-service handheld eye testing device which comprises a shell, a fundus camera, a first platform and a second platform are arranged in the shell, the fundus camera is connected with the first platform, the first platform is connected with the second platform in a sliding mode, and a first motor and a first transmission wheel are arranged between the first platform and the second platform. The first motor is fixedly connected with the first platform, one end of the first transmission wheel is in key connection with the output end of the first motor, the other end of the first transmission wheel is in sliding connection with the second platform, the second platform is provided with a first limiting part used for sliding limiting of the first transmission wheel, and the first transmission wheel is an eccentric wheel. The first motor rotates with the output end of the first motor as the rotating axis to drive the first transmission wheel to move along the first limiting part, and the first platform can be matched with the first motor to move to drive the fundus camera to move towards the eye position close / away direction. The position of the fundus camera of the eye detection device is convenient to adjust, and carrying is convenient.

The invention provides an image processing method considering weak light imaging and a fundus camera, and belongs to the technical field of image processing, and the method specifically comprises the steps: determining the recognition deviation condition under different eye image features based on recognition matching data, carrying out the determination of an enhanced and optimized image feature in the eye image features based on the recognition deviation condition, and carrying out the recognition of the enhanced and optimized image feature. The method comprises the following steps: acquiring image enhancement data under different enhanced and optimized image features in real time, determining matching illumination quantity intervals of the enhanced and optimized image features in combination with identification matching data under the different enhanced and optimized image features, and determining similarity conditions of the matching illumination quantity intervals of the different enhanced and optimized image features. And an image enhancement processing strategy of the eye image features is determined in combination with image enhancement data of the enhanced and optimized image features in different illumination quantity intervals, so that determination of adaptive illumination quantity intervals under different eye image features is realized.

Various examples are provided related to high dynamic range (HDR) imaging of a retina. In one example, a fundus camera includes an imaging sensor; an ophthalmic lens; and a source of input light. The source can illuminate the retina at sequentially increasing illumination power levels during a series of illumination periods within a pupillary reflex time of the eye. The imaging sensor can capture a corresponding low dynamic range (LDR) image of during each of the series of illumination periods, which can be combined to generate a HDR image of the retina. An external fixation target can be used to capture LDR images at different visual angles to generate HDR images, which can be combined to generate widefield HDR images.

Various examples are provided related to hybrid light-ultrasound fundus imaging. In one example, an ocular imaging system includes a substantially transparent ultrasound transducer; an optical imaging system including a fundus camera sensor aligned with the ultrasound transducer; and one or more control interface components that can enable visualization of an ocular surface and perform filtering on imaging signals generated by the ultrasound transducer operatively connected to the fundus camera sensor. In another example, a method for ocular imaging includes illuminating an ocular surface of an eye with the ocular imaging system; aligning the ultrasound transducer with a lesion on the ocular surface using the optical imaging system; and obtaining ultrasound pulse-echo scan data of the lesion using the ultrasound transducer.

The application provides an eye fundus image acquisition method and device based on an eye fundus camera. A first eye position shooting request is received, and an internal fixation light mark is set to move a preset distance in a nasal direction in a center area of a display interface. A preview image of an eye of a detected person is acquired by a preview image acquisition unit, and a macula, a disc, and an artifact of the preview image are identified. When the artifact does not block a macula position and a disc position, an eye fundus image of the eye of the detected person is acquired by an eye fundus image capture unit. When the artifact blocks the macula position and / or the disc position, the internal fixation light mark is moved between the macula and the disc. This method can change the response position of the internal fixation light by adjusting the internal fixation light mark, so that the artifact in the finally acquired eye fundus image does not block the macula position and the disc position, thereby effectively avoiding information loss and helping doctors diagnose diseases.

The application discloses an optical system for fundus imaging and a fundus camera thereof. The optical system for fundus imaging comprises an illumination assembly, an imaging assembly, an objective lens assembly and a diaphragm structure. The illumination assembly comprises a light source, and an illumination light path is formed between the light source and an examination position to provide an illumination beam to irradiate a pupil. The imaging assembly comprises an imaging element to form a fundus image, and an imaging light path is formed between the imaging element and the examination position. The objective lens assembly is arranged in the illumination light path and the imaging light path, and an objective lens optical axis is formed between the objective lens assembly and the examination position. The illumination light path and the imaging light path are arranged at an angle and are separately arranged on two sides of the objective lens optical axis. The diaphragm structure comprises a first light-transmitting part arranged in front of the imaging element to allow a fundus-reflected light beam to pass through. In the case of allowing the fundus-reflected light beam to pass through the imaging light path, optical ghost images caused by stray light reflected by the objective lens assembly are eliminated.

The present invention discloses an integrated slit lamp eye detection device, which includes a fundus camera, a lateral movement assembly, a front-back movement assembly, an avoidance assembly, and a slit lamp assembly. The avoidance assembly and the slit lamp assembly are arranged in pairs on both sides of the fundus camera. The front-back movement assembly and the avoidance assembly are both installed on the lateral movement assembly. The avoidance assembly includes a fixed seat installed on the lateral movement assembly, a first driving assembly, and a movable plate movably connected to the fixed seat. The slit lamp assembly is fixedly connected to the movable plate. The movable plate is driven by the first driving assembly to control the position of the slit lamp assembly relative to the fundus camera and the eye. The front-back movement assembly is used to drive the fundus camera to approach or move away from the eye. This technical solution enables interference to be avoided between the slit lamp assemblies on both sides of the fundus camera or between the slit lamp assemblies on both sides and the fundus camera.

According to the fundus focusing device and method for the fundus camera, a light source module, an illumination module, a spectroscope, an eye connection module, an imaging module, the camera and a focusing device are arranged, and two laser beams with the included angle smaller than 20 degrees are formed through the light source module; the spectroscope reflects the two laser beams collected and adjusted by the illumination module to form illumination light, the spectroscope transmits the fundus signal light to form transmission light, and a fundus image with two stripes is obtained through the camera; and then the focusing device adjusts the positions of the illumination module and the imaging module to complete fundus imaging focusing, so that the fundus imaging focusing precision is guaranteed, and the technical defects that an existing ultra-wide-angle fundus imaging system is poor in focusing precision, long in focusing process time consumption and insufficient in adjusting precision are overcome.

The invention discloses a mydriasis-free fundus camera and an imaging method thereof, and the mydriasis-free fundus camera comprises an imaging system which is used for shooting an image of a fundus to be detected; the illumination system is used for providing illumination light for the fundus to be detected; the lighting system comprises a first lighting module and a second lighting module which are asymmetrically arranged; the first illumination module and the second illumination module are arranged in a front-back staggered manner along the optical axis direction of the objective lens to form a distributed illumination structure; the light emitting surface of the first illumination module and the fundus to be detected are in a conjugate relationship; and the light emitting surface of the second illumination module and the fundus to be detected are in a non-conjugate relationship. By optimizing the layout of the illumination module and introducing the polaroid system, more uniform illumination is realized, smaller pupil diameter is supported, the equipment size is reduced, cornea reflection is weakened, and eyepiece ghosting is effectively inhibited.

The invention provides a diabetic retinopathy intelligent diagnosis result credibility evaluation device, which comprises a data interface module and a processing module, and is characterized in that the data interface module is used for acquiring fundus image data from a fundus camera, acquiring non-image clinical data from an electronic medical record system, and processing the non-image clinical data; the fundus image data and the non-image clinical data are sent to the processing module, and the processing module is used for conducting credibility evaluation on the diabetic retinopathy intelligent diagnosis result according to the fundus image data and the non-image clinical data. According to the invention, the crossing from a black box to a grey box is realized, and the clinical credibility is obviously enhanced; according to the method, a systematic and multi-dimensional credibility quantification framework is proposed and realized for the first time, and the transparency, safety and reliability of AI in clinical application are greatly enhanced.

The invention discloses a retinal vessel three-dimensional imaging system and method based on an ultra-wide-angle laser fundus camera, and relates to the field of medical imaging devices. The problems that layered imaging cannot be achieved through single-wavelength laser in existing fundus imaging, and the scanning angle of an existing dual-wavelength confocal system is limited are solved. The system comprises a multi-wavelength laser generating unit, a semi-transmitting and semi-reflecting element, a galvanometer unit, a chromatic aberration lens, a sample to be detected, a focusing lens and a detector with a pinhole, laser emitted by the multi-wavelength laser generating unit is reflected by the semi-transparent and semi-reflective element, then sequentially passes through the galvanometer unit and the chromatic aberration lens, is emitted to a to-be-detected sample, sequentially passes through the chromatic aberration lens, the galvanometer unit, the semi-transparent and semi-reflective element and the focusing lens after being reflected by the to-be-detected sample, is received by the detector with a pinhole, and reaches the silicon PM; a multi-wavelength retina confocal image is generated from the signals acquired by the silicon PM. The method is also suitable for the field of full-layer three-dimensional imaging from the retina nerve fiber layer to the choroid.