Canon Kabushiki Kaisha

Takashi Masuda

Kyoji Sekiguchi

Yoshimasa Hamano

Yukitsugu Nakamura

Yukitugu Nakamura

Kazuhiro Matsumoto

Yoshimi Kohayakawa

Isao Matsumura

Osamu Yamamoto

Hiroshi Nishihara

Motoya Takai

Toshiaki Okumura

Takeshi Kitamura

Kazunobu Kobayashi

Koji Uchida

Tetsuji Ogawa

Shigeo Maruyama

Hiroshi Aoki

Toshio Sakane

Toshifumi Masaki

Haruhisa Madate

Yasuyuki Ishikawa

Yasuo Maeda

Satoshi Shimashita

The present invention relates to an ophthalmologic phototaking apparatus having an illuminating system for illuminating an eye to be examined, a phototaking system for phototaking the image of the eye to be examined illuminated by the illuminating system, a digital signal converting system for converting the image of the eye to be examined phototaken by the phototaking system into a first data format of digital image data, and a data format converting system for converting the first data format of digital image data into a second data format of digital image data.

Ophthalmologic phototaking apparatus

An apparatus for phototaking the image of an eye to be examined has an image pickup element for picking up the image of the eye to be examined, a first signal converting system for converting an image signal from the image pickup element into a signal for animated picture display, a second signal converting system for converting the image signal from the image pickup element into a digital image signal, and an image pickup element drive system for executing the drive systems of the image pickup element corresponding to the first and second signal converting systems.

Apparatus for phototaking the image of an eye comprising systems for

This specification discloses an ophthalmologic apparatus for executing an eye examination on an eye to be examined. The ophthalmologic apparatus is provided with an eye examination unit, an alignment drive system for driving the eye examination unit to thereby execute the alignment between the eye examination unit and the eye to be examined, a time measuring portion, and a control system for causing the alignment drive system to drive the eye examination unit on the basis of the output of the time measuring portion so as to return the eye examination unit to an eye examination waiting position.

Ophthalmologic 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

A position detecting apparatus for an ophthalmologic apparatus has an image pickup element, a light source, a first projection system for projecting a light beam from the light source onto the cornea of an eye to be examined, a second projection system for projecting one corneal reflection image of the light source onto a plurality of positions on the image pickup element, and a calculator for calculating the central positions of and the distance between the corneal reflection images projected onto the plurality of positions on the image pickup element. The positional deviation of the ophthalmologic apparatus relative to the eye to be examined from an aligned state is quantitatively detected by the calculation by the calculator.

Position detecting apparatus for an ophthalmologic apparatus

An ophthalmic apparatus includes an apparatus control mechanism for performing an ophthalmic operation for an eye to be examined, and a rotary mechanism for inputting information to the control mechanism. The control mechanism has a plurality of modes. The rotary mechanism serves as an input unit for performing different control operations respectively corresponding to the individual modes.

Ophthalmic apparatus including an apparatus control mechanism having

An ophthalmic measuring apparatus includes a device for measuring the distance from a certain point (such as the center of the other of right and left spectacle lenses or the bridge position of the lenses) to the center of the lenses on the basis of the amount of displacement of a spectacle lens contacting member, and a device for measuring the distance from a certain point (such as the center of the pupil of the other of right and left eyes to be examined or the nose position) to the center of the pupil on the basis of the amount of displacement of an observation system for observing the front eye parts of the eyes to be examined therethrough.

Ophthalmic measuring apparatus

An apparatus capable of simply and accurately measuring cornea refractive power and eye axis length at least necessary to select a proper in-the-eye lens for an eye to be examined without moving a slidable bed in a horizontal plane.

Ophthalmologic apparatus having two measuring systems

An ophthalmic apparatus includes a first index mark provided as an index mark for measuring the shape of a cornea substantially on the optic axis, a second index mark provided around the optic axis, and a calculator for calculating the shape of the cornea based on the position information of the cornea-reflected image of the first and second index marks.

Ophthalmic apparatus capable of measuring the shape of a cornea

An ophthalmologic apparatus can measure the eye axis length of an eye to be examined and other information of the eye to be examined (for example, the cornea refractive power). In the case of the measurement of the eye axis length, when moving a detecting terminal itself by driving means, the driving means is controlled so as to slow down the speed of movement of the detecting terminal when the detecting terminal comes near the cornea of the eye to be examined.

A supersonic ophthalmic measuring apparatus includes a supersonic probe for contacting the cornea of an eye to be examined. A calculator for calculating the amount of depression of the cornea of the eye to be examined caused by the supersonic probe, and a corrector for correcting the result of the measurement of the eye axis length of the eye to be examined by the supersonic probe by the amount of depression.

Supersonic ophthalmic measuring apparatus

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.

A slit projection apparatus has slit light beam forming means and a projection optical system for projecting a slit image onto an object to be examined. The projection optical system is provided with a light deflecting member rotatable so as to form a predetermined elevation angle, and a lens system having a predetermined focal length corresponding to the angle of rotation of the light deflecting member so as to compensate for the optical path difference conforming to said angle of rotation and including a lens having at least a portion thereof movable in the direction of the optic axis while keeping a predetermined spacing with respect to the light deflecting member.

Slit projection apparatus

An ophthalmic measuring apparatus has an ultrasonic detector for measuring the length of a predetermined region of an eye to be examined, a device provided with a center axis coaxial with the center axis of the vibrator of the ultrasonic detector and projecting an index mark onto the cornea of the eye to be examined, and an imaging optical system for forming the corneal reflection image of the index mark on a predetermined image plane to measure the shape of the cornea.

An eye refractive power measuring apparatus having a unit for projecting a plurality of index images onto the fundus of an eye to be examined, a unit for detecting the eye fundus reflected light beams of the index images correspondingly to each measuring meridian direction, a unit for operating the refractive power of the eye on the basis of the output of the detecting means, a unit for moving a fixation target for fixing the eye to be examined thereto or the projection system thereof in the direction of the optic axis, and a unit for controlling the movement speed of the fixation target or the projection system thereof on the basis of the degree of variation in the result of the measurement of the operated refractive power of the eye which results from the movement.

Growing community of inventors

Yamato, Japan

Takashi Masuda