Canon Kabushiki Kaisha

Nobuyoshi Kishida

Shinya Tanaka

Tomoyuki Iwanaga

Shigeaki Ono

Yasuyuki Numajiri

Toshiaki Okumura

Hideyuki Ohban

Hajime Nakajima

Toshikazu Tamura

There are included an acquiring unit configured to acquire a parameter regarding capturing of a first tomographic image of an eye to be examined, an acquiring unit configured to acquire a parameter regarding capturing of a second tomographic image of the eye to be examined, wherein capturing of the second tomographic image is being performed after capturing of the first tomographic image, and a warning unit configured to issue a warning against capturing of the second tomographic image in accordance with a comparison between the parameter regarding capturing of the first tomographic image and the parameter regarding capturing of the second tomographic image.

Ophthalmic apparatus, control method, and computer readable storage medium

An ophthalmic photographing apparatus or method receives light returned from an eye to be examined, calculates a plurality of temporally continuous photometric values based on a light receiving result in the receiving, and determines whether or not the eye is to be photographed, based on the plurality of calculated photometric values.

Ophthalmic photographing apparatus and method of controlling the same

An ophthalmologic imaging apparatus includes an observation light source configured to generate infrared light for illuminating a subject's eye via an illumination optical system, an imaging unit configured to receive light returned from the subject's eye via an imaging optical system, and an electronic shutter control unit configured to refresh charge generated caused by light received by the imaging unit in response to turning off of the observation light source.

Ophthalmologic imaging apparatus and ophthalmologic imaging method

A fundus camera includes a focus target projection unit including a focus target located at a position conjugate with a fundus of a subject's eye, a split optical element configured to split a light flux passing through the focus target, and a focus target illumination light source configured to illuminate the focus target, a fundus photographing optical system including a focusing lens, a focus link mechanism configured to interlockingly move the focus target projection unit and the focusing lens in a direction of an optical axis, at least two lenses located behind a plane optically conjugate with the imaging plane of the fundus photographing optical system and outside an optical axis of the fundus photographing optical system, image sensors respectively located behind the two lenses, and a phase difference detection unit configured to detect a phase difference between the focus target images based on signals output from the image sensors.

Fundus camera

An ophthalmologic photographing apparatus includes a photographing mode selection unit configured to select one of a plurality of photographing modes respectively corresponding to different photographing conditions, an imaging unit configured to capture an image of a subject's eye, an original image data generation unit configured to process electronic data of the image captured by the imaging unit according to the selected photographing mode and to generate a plurality of original image data differing from one another in spatial resolution and gradation resolution, and an image processing unit configured to generate a electronic image for diagnosis, which has similar gradation resolution to that of each of the plurality of original image data generated by the original image data generation unit.

Ophthalmologic photographing apparatus

A fundus camera includes a fundus photographing optical system including an image-recording image sensor for photographing a fundus image via a focusing lens, a focus target having a plurality of regions for forming light fluxes passing through a plurality of different areas on pupil of a subject's eye, and a focus drive unit for driving the focusing lens based on positions of a plurality of images of the focus target in an image captured by the image-recording image sensor and on contrast of the images.

An ophthalmologic photographing apparatus includes an imaging unit configured to capture a fundus image of a subject's eye to output an image signal, a projection unit configured to intermittently project an index light flux onto the subject's eye in synchronization with the image signal from the imaging unit, and an image recording unit configured to record the image signal from the imaging unit as a moving image.

In an eye fundus examination apparatus such as an eye fundus blood flowmeter, the display on a monitor is changed depending on the detection stage of the eye fundus examination apparatus. When measurement is started, an eye fundus image is zoomed to allow an easy check on the measurement state of the eye fundus. When the measurement is completed, the eye fundus image is restored to its initial size. This makes it possible to easily observe a measurement region during measurement and facilitate observation of measurement data after the measurement. In addition, when an eye fundus image is to be zoomed, a measurement region can be reliably observed by positioning the measurement position in the center of the monitor.

Eye fundus examination apparatus

A blood flow measuring apparatus includes a system control unit that sends outputs for controlling the start and end of the measurement to optimum gain calculation units, which calculate the optimum gains of photomultipliers for receiving the light reflected from the eye fundus and the system control unit controls whether the optimum gains are outputted or not. Also, the optimum gain calculation unit respectively supply the system control units with outputs for monitoring whether the setting of the optimum gain has been completed or not, whereby the system control unit discriminates whether the photomultipliers have been set at the optimum gains.

Blood flow measuring apparatus

A blood vessel tracking apparatus includes a light source for emitting light and illuminating a blood-vessel with the light. The apparatus also includes a light-receiving sensor for receiving a blood vessel image made of light from the illumination light source reflected by the blood-vessel. The apparatus also includes an optical-path changing device for changing the optical-path of the light emitted from the illumination light source and a calculator for calculating the blood-vessel diameter of the illuminated blood-vessel based on an output of the light-receiving sensor, a plurality of times. A measuring device is also provided, which measures the change in blood-vessel diameter based on the calculating performed by calculating device.

Blood vessel tracking apparatus

This specification discloses an eye fundus blood flow meter having a blood flow measuring system for measuring the blood flow of the fundus of an eye to be examined, and a malfunction detecting unit for detecting measurement malfunction occurring during the measurement by the blood flow measuring system. The specification also discloses an eye fundus tracking apparatus for tracking a predetermined position on the fundus of an eye to be examined having a tracking mechanism for tracking a predetermined position on the eye to be examined, an abnormality detecting system for detecting the operational abnormality of the tracking mechanism, and a control unit for executing predetermined control on the tracking mechanism when the operational abnormality occurs.

Eye fundus tracking apparatus and eye fundus blood flow meter using the

An ophthalmological imaging apparatus includes a main body portion, an internal power source and an external power source. The main body portion has a light source producing light for imaging the eye to be examined. The internal power source is provided in the main body portion and supplies electrical energy to the light source for the production of the light. The external power source is provided discretely from the main body portion and supplies from outside of the main body portion electrical energy to the light source corresponding to the deficiency in the amount of light from the light source produced by the electrical energy from the internal power source relative to a desired amount of light for imaging.

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Musashino, Japan

Nobuyoshi Kishida