Nidek Co., Ltd.

Koki Kato

Naoki Isogai

Tetsuyuki Miwa

Nobuo Suzuki

Munehiro Nakao

Mitsuhiro Gono

Nobuharu Kobayashi

Noriyuki Ishihara

An eye refractive power measurement apparatus for measuring a refractive power of an eye to be examined, the apparatus comprising a projecting optical system for scanning and projecting a slit light bundle onto a fundus of the eye to be examined, a photo-receiving optical system provided with a photo-detector arranged at a conjugate position with a cornea of the eye so as to have a predetermined position with respect to a scanning direction of the slit light bundle and an open diaphragm, can be arranged at different predetermined positions, for reducing the slit light bundle, a selecting device for selecting the position of the open diaphragm so as to change a range in which the photo-receiving optical system can detect an eye refractive power and an eye refractive power calculating device to calculate a refractive power of the eye based on an output signal from the photo-detector receiving the slit light bundle reflected from the fundus of the eye through the open diaphragm and the position of the open diaphragm.

Eye refractive power measurement apparatus

An alignment detecting apparatus for detecting an alignment condition between an eye to be examined having approximately spherical surface or approximately toric surface and a device having a standard axial lines the apparatus comprising a target projecting optical system which includes a first target projecting optical system for projecting a first target with a predetermined angle relative to the standard axial line, and a second target projecting optical system for projecting a second target with a different angle compared with the angle of the first target projecting optical system relative to the standard axial lines of which at least one between the first and second targets is a target of a finite distances a detecting optical system for detecting positions of images of the first and second targets which are projected onto the eye by the first and second target projecting optical systems, and a judging device for judging the alignment condition based on results detected by the detecting optical system.

Alignment detecting apparatus

An ophthalmologic alignment device for aligning a measuring system at a predetermined position for an eye to be examined. The user moves the measuring system with a joystick for aligning purposes while observing a frontal eye image with an observation unit. A second moving unit further moves the measuring system moved by the user. An index projection/detection system projects an index onto the eye and detects the reflected index. The controller causes drivers to drive the second moving unit on the basis of the result of the detection of the index projection/detection system. A mode switch switches the movement of the measuring system from a mode in which the observation unit is moved by the first moving unit to a mode in which the observation unit is moved by the second moving unit, whereby the alignment of the eye and the measuring system is achieved easily and with high accuracy, irrespective of the degree of the user's skillfulness in handling the alignment device.

Ophthalmologic alignment device with automatic alignment means

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Gamagori, Japan

Koki Kato