31 results about "Fundus reflex" patented technology

A portable hand-held camera for imaging the fundus of an eye, the camera comprising a housing comprising an internal cavity terminating at a forward housing end, a forward lens, and a light source configured to direct light from locations distributed around the perimeter of the forward lens forwardly out of the housing end. In other embodiment, a portable hand-held camera for imaging the fundus of an eye includes optics configured to focus light reflected back from the fundus onto an image receptor, with the optics being capable of varying the field of view among differing portions of the fundus. Methods to ensure unique image identification and storage are described.

A fundus camera includes an illumination unit which includes an optical element configured to irradiate an eye fundus with visible light from a position conjugate with an anterior eye portion of an eye to be examined, and an imaging unit configured to take an image of the eye fundus with light which is emitted from the illumination unit and reflected from the eye fundus, wherein the illumination unit includes a blue LED chip and a fluorescent member that is excited by light emitted from the blue LED chip and emits fluorescence, and the fluorescent member is irradiated again with apart of the light reflected by the optical element.

A fundus imaging apparatus comprises: an irradiation optical system comprising a light source which emits a laser beam and a scanner which two-dimensionally scans the laser beam on a fundus of an examinee's eye, the irradiation optical system being adapted to focus the laser beam emitted from the light source on the fundus to form a confocal region; an imaging optical system comprising a photo-receiving element which receives reflection light of the laser beam reflected from the fundus, the imaging optical system being adapted to focus the reflection light from the fundus and receive the reflection light by the photo-receiving element; and a beam restriction member placed in an optical path of the imaging optical system, the beam restriction member comprising: one of an opening through which part of the reflection light from the fundus outside the confocal region is allowed to pass toward the photo-receiving element and a mirror part which reflects the part of the reflection light from the fundus outside the confocal region toward the photo-receiving element; and a light shielding part which shields the reflection light from the fundus in the confocal region and the part of the reflection light from the fundus outside the confocal region. The light shielding part includes a first light shielding part placed in a conjugate position with a focus point of the laser beam on the fundus and a second light shielding part placed in a nearly conjugate position with the fundus and adapted to shield part of an optical path of the reflection light, the second light shielding part is formed around the first light shielding part.

The invention relates to a self-adapting optical human micro-visual field defect evaluation system. The light emitted by a beacon penetrates a collimating mirror, a first reflecting mirror and a firstbeam-splitting mirror and then enters the pupilla of human eyes. The reflected light from the ocular fundus penetrates the first beam-splitter mirror and a first beam-matching telescope, is reflectedby a wavefront corrector, penetrates a second beam-matching telescope, a second reflecting mirror and a second beam-splitting mirror and enters a Hartman wavefront sensor. A computer calculates and controls the voltage according to the detected aberration and drives the wavefront corrector to correct the human eye aberration after the high-voltage amplification. After the aberrational correctionis completed, the computer software generates a stimulating visual sign and the stimulating visual sign is displayed on a stimulating visual sign display device. A subject observes the stimulating visual sign via the system and makes the determination. The determination of the subject is recorded for the evaluation of the human visual field defect. Based on the self-adapting optical techniques, the self-adapting optical human micro-visual field defect evaluation system greatly reduces the visual field examination stimulus redundancy caused by the human eye aberration, realizes the early diagnosis of early-stage tiny visual field defect caused by diseases, and provides a powerful tool for the human micro-visual field evaluation and the early diagnosis of the related diseases.

The invention discloses a visible fundus examination tester which comprises a fundus examination lens and a tester body. An infrared receiving digital camera and a first circuit control wiring port are arranged on the head portion of the tester body, the fundus examination lens comprises an aspheric surface eye objective lens, a lighting optics focusing set and a micro imaging objective lens set. A second circuit control wiring port is arranged behind the micro imaging objective lens set, and the fundus examination lens is connected with the digital camera through the butting joint of the first circuit control wiring port and the second circuit control wiring port. The infrared rays sent by a flashlight and an infrared light emitter are reflected to the aspheric surface eye objective lens through a reflection mirror, and are projected into the fundus of an eyeball through the aspheric surface eye objective lens. The infrared rays reflected by the fundus are imaged to the digital camera through the imaging of the aspheric surface eye objective lens and the micro imaging objective lens set. Through the mentioned mode, the visible fundus examination tester can catch sight of a fundus imaging picture intuitively, and shoot accurately, and carry out storage or printing.

The invention relates to a visual digital ophthalmoscope for checking and recording fundus diseases, which includes a handle and a main casing arranged on the upper part of the handle. A rotating wheel is arranged inside the main casing, and a diopter compensation mirror is sleeved on the right side of the rotating wheel. The right side of the main casing is provided with a digital video camera, and the main casing is sequentially provided with a light bulb, a condenser, an adjusting disc, a projection mirror and a reflector from bottom to top, and the placement position of the reflector is at an angle of 45° to the right side wall of the main casing. The light emitted by the bulb enters the adjustment disc after being converged by the condenser lens, and then the light is coupled out into the projection mirror by the slit in the adjustment disc. The light from the light enters the digital camera through the diopter compensation lens, and the digital camera can shoot, record, record and save the fundus mirror image of the patient to improve the correct rate of diagnosis; the ophthalmoscope with this structure is small in size, simple in structure, easy to carry, and is suitable for going out for medical treatment.

The invention discloses a binocular optometry device and an optometry method. The binocular optometry device includes a light source, a condenser lens group, a light splitting device, and an optical element adjustment device. The light splitting device divides the light into two beams. The first beam of light passes through the first fundus imaging optical path to form a first dot matrix image of the fundus reflected light of the first human eye on the first imaging unit; the second beam of light passes through the first fundus imaging optical path. Two fundus imaging optical paths, forming the second dot matrix of the fundus reflected light of the second human eye on the second imaging unit; the optical element adjustment device adjusts the first and second fundus imaging optical paths along the real interpupillary distance Direction adjustment: adjust the light source along the optical axis and maintain foggy vision, so that the subjects with different diopters can get clear first and second dot matrixes on the first imaging unit and the second imaging unit respectively. Figure: The light source and the binocular fundus are conjugate with respect to the condenser lens group. The invention can measure binocular diopter and interpupillary distance, and accurately judge binocular astigmatism and axial position.

The invention discloses a fundus camera combined with an OCT system. The fundus camera combined with the OCT system comprises an OCT module, a first spectroscope, a second spectroscope, a first trepanned diaphragm, an eye lens, an illumination light path and an imaging light path. The OCT model provides reference light and detecting light. The reference light returns after reflected through the fundus and generates interference with reference light returned from a reference arm module in an optical fiber coupler, interference light is detected by a detection system and processed through a control system, and an OCT image of the human eye is displayed. The illumination light path provides illumination light entering the fundus of the human eye, and the illumination light enters an imaging light path shooting human eye fundus images after being reflected by the fundus. According to the fundus camera combined with the OCT system, when tomography imaging is carried out on the fundus, the detecting light does not need to pass through a flexor adjusting lens of the imaging light path, the power of OCT signal light entering the human eye fundus cannot be influenced by flexor adjustment of the flexor adjusting lens, and therefore good OCT images of human eye fundi of different refractions can be obtained.

The invention relates to a full-field OCT method for generating an imaging of an ocular fundus (31), in which short-coherent light (22) is emitted and split into an object beam path (25) and a reference beam path (24). The object beam path (25) is directed onto the ocular fundus (33). The reference beam path (24) and a portion of the object beam path (25) reflected by the ocular fundus (31) are directed onto an image sensor (32), such that an interference between the reference beam path (24) and the object beam path (25) occurs on the image sensor (32), wherein the reference beam path (24) impinges on the image sensor (32) at an angle deviating from the object beam path (25). Before impinging on the image sensor (32), the reference beam path (24) impinges on an optical correction element (27) in order to reduce a chromatic aberration within the reference beam path (24). Intensity information and phase information is determined from a capturing of the image sensor. A focus-adjusted image of the ocular fundus is calculated. The invention also relates to a system that is suitable for carrying out the method. Images of the ocular fundus can be captured without the beam path being previously adapted to the refractive power of the eye lens.

An ophthalmic imaging apparatus comprising: an illumination light source and an optical assembly for directing light from the light source into an eye of a subject; a photosensor array comprising a plurality of photosensors positioned for acquiring images of portions of a fundus of the eye; an objective lens positioned along an imaging axis intersecting a point on the fundus of the eye wherein the objective lens is positioned for refracting light that has been reflected by the fundus to form an image of the fund us on an image plane of the objective lens such that the image plane is positioned away from the photosensor array; and a microlens array comprising a plurality of microlenses wherein the microlens array is spaced away from and positioned behind the image plane and wherein the microlens array is positioned in between the image plane and the photosensor array such that each microlens in the array projects a different view of the image formed at the image plane thereby forming an array of elemental images on the photosensor array.

The invention relates to a fundus imaging device and an imaging method. The fundus imaging device includes an LED light source, a light modulation unit, a detection unit and an optical signal receiver arranged sequentially along the direction of the optical path, wherein the LED light source is used to emit spatially incoherent light; the light The modulation unit is used to modulate the spatially incoherent light into parallel rays, and change the direction of the light path of the parallel rays; the detection unit is used to converge the parallel rays after changing the direction of the light path to obtain the incident light for entering the eyeball; the fundus reflection of the eyeball The incident light generates outgoing light in the opposite direction to the incident light; the optical signal receiver is used to record the speckle pattern formed by the outgoing light. The fundus imaging device is designed by combining various optical elements, and the imaging of the object to be tested can be realized by collecting a single frame of speckle pattern during the focusing and imaging process. In the case of light scattering and no light scattering such as vitreous opacity.