Canon Kabushiki Kaisha

Kyoji Sekiguchi

Takashi Masuda

Motoya Takai

Isao Matsumura

Toshifumi Masaki

Haruhisa Madate

Yukitugu Nakamura

Hajime Nakajima

Shigeaki Ono

Masao Shikaumi

Yoshimi Kohayakawa

Osamu Yamamoto

Hiroshi Aoki

Toshiaki Okumura

Kazunobu Kobayashi

Koji Uchida

Yasuo Maeda

Kenichi Kashiwagi

An ophthalmologic photographing apparatus includes an optical system, a pedestal, an auxiliary lens configured to be able to be inserted into and retracted from the optical system, a focusing lens, a focusing lens driving unit configured to move the focusing lens along an optical axis, a pedestal position detection unit configured to detect that the pedestal is away from the subject's eye by a predetermined distance, an auxiliary lens insertion detection unit configured to detect that the auxiliary lens is inserted into the optical system, a storage unit configured to store a position of the focusing lens, and a control unit configured to cause the focusing lens driving unit to move the focusing lens to a predetermined position stored in the storage unit based on outputs from the pedestal position detection unit and the auxiliary lens insertion detection unit.

Ophthalmologic photographing apparatus

When the fundus camera is positioned on the same side as the subject's eye relative to an appropriate position (front-focus state), the positioning index light source turned on in blue produces most-focused positioning index images. The positioning index light sources become more blurred in order of green and red. When the camera is positioned on the opposite side of the subject's eye relative to the appropriate position (rear-focus state), the positioning index light source turned on in red produces most-focused images. The positioning index light sources become more blurred in order of green and blue. Based on a degree of the blur of the individual positioning index images in red, green, and blue reflected by the cornea of the subject's eye, the calculation unit calculates whether to move the camera body closer to or farther away from the subject's eye and allows the display unit to display the information.

Ophthalmic apparatus

A fundus camera that obtains focus evaluation values by scanning, in which a focusing lens moves a predetermined distance according to a photographing mode before the focusing lens starts scanning for obtaining focus evaluation values.

Fundus camera

A fundus camera includes an observation photographing unit having a focusing lens to perform focusing of an imaging unit on a fundus of a subject's eye, a lens driving unit configured to drive the focusing lens in an optical axis direction, and a focusing control unit configured to calculate a focusing evaluation value based on image information of a predetermined area of a fundus image captured by the observation photographing unit, and drive the focusing lens based on the focusing evaluation value, thereby performing focusing, wherein the focusing control unit moves the focusing lens from a previous photographing position of the focusing lens by a predetermined moving amount, and then performs the focusing.

An area having a diameter in which a peripheral area of an eye fundus image is covered with a mask is displayed on a monitor. When a region which may be abnormal is found in the vicinity of a boundary between the mask and the eye fundus image during image viewing, the display area enlarging means is operated. Then, an aperture area of the mask is enlarged to expand a display area of the eye fundus image, so the eye fundus image including some flare is displayed on a wide area. Therefore, an abnormal state of the region can be recognized.

Ophthalmic image sensing apparatus

In a case of right and left eye fundus image sensing in a mass health examination, the alignment of an anterior segment of an eye to be examined is performed first (S). When the alignment of the anterior segment of eye is completed, image sensing light intensity is set (S). The alignment of a fundus segment of the eye to be examined is performed (S). Furthermore, an image of the fundus of the eye to be examined is sensed by a sensing switch being pushed after the completion of focus adjustment (S). Next, an optical base unit is moved so that the image sensing of another eye can be performed (S). A left or right eye detection unit detects that an eye for image sensing is changed with the move of the optical base unit. When the eye for image sensing is changed, an image sensing light intensity setting unit sets image sensing light intensity by adding a predetermined amount, or changing the sets image sensing light intensity according to a diameter of a pupil (S). Then, alignment and the like are performed similarly to Sand S(S, S), and an image of another eye is sensed.

To determine the presence or absence of an aperture mask in a funduscopic image output by a fundus camera, and to combine the funduscopic image with an aperture mask image formed in an aperture mask-forming section so as to correspond to a determination result. When an aperture mask determination sectiondetermines the absence of the aperture mask image in the funduscopic image and the necessity of the addition, the aperture mask-forming sectionforms a necessary mask, and an aperture mask combine sectioncombines the funduscopic image with the aperture mask image.

Funduscopic image processing unit and method

An ophthalmological apparatus includes an illuminator for illuminating an eye to be examined; an image pickup device for obtaining the image of the illuminated examined eye; a signal converter for converting a signal from the image pickup device into digital data; and a controller for controlling a system, which controller limits a predetermined operation of other than the image pickup device and the signal converter while the signal converter is performing a conversion operation. The ophthalmological apparatus can take a high-quality photographic image by preventing the occurrence of noise or by reducing noise.

Ophthalmological apparatus

This invention provides an ophthalmic measuring apparatus and an ophthalmic apparatus particularly for observation by retroillumination. The ophthalmic measuring apparatus is provided with an eye measuring system, an observing system enabling observation of the eye to be examined by the examiner, an anterior segment illuminating system and a control system. The ophthalmic apparatus is provided with an observing system enabling observation of the eye to be examined, an ocular fundus illuminating system, a time measuring means and a control system.

Ophthalmic apparatus including ocular fundus illuminating system for

An ophthalmologic apparatus having a slidable bed slidable horizontally and vertically to observe, measure, and photograph an eye to be examined. The ophthalmologic apparatus has a base, a slidable bed slidable on the base, a joy stick for permitting a user to control sliding of the slidable bed, a monitor for effecting image display, and a control unit for controlling a displayed image on the monitor in response to the operation of the joy stick.

Opthalmologic apparatus having a slidable bed

An ophthalmic measuring apparatus having a cornea shape measuring device and an eye refractive power device which are operated so that both the measurements of the shape of cornea and the eye refractive power may be effected simultaneously.

Ophthalmic measuring apparatus

An ophthalmic measuring apparatus has a corneal shape measuring system projecting a first target image onto the cornea of an eye to be examined and receiving the corneal reflection image of the first target image by a first photodetector device to obtain information on the corneal shape, a refractive power measuring system projecting a second target image onto the eye fundus of the eye to be examined and receiving the corneal reflection image of the second target image by a second photodetector device to obtain information on the refractive power of the eye, a signal processing device selectively receiving the output of the corneal shape measuring system or the refractive power measuring system to calculate the corneal shape or the refractive power of the eye, and a measuring mode selecting device connected to the signal processing device to select a single measurement of the corneal shape of refractive power of the eye, or successive measurements of both.

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Utsunomiya, Japan

Kyoji Sekiguchi