Nidek Co., Ltd.

Naoyuki Kondo

Junichi Akita

Akihiro Fujishiro

Toshifumi Sumiya

Katsuyasu Mizuno

Hisanari Torii

Satoshi Imaizumi

Kazunobu Kojima

An apparatus for observing a fundus of an eye of an examinee has an observation optical system having an image-pickup element which obtains a time-series fundus image, a display part which displays the obtained fundus image on its monitor as a moving image, a determination part which determines a standard fundus image based on the displayed image, a memory part which stores the determined image, a calculation part which digitizes the image based on a threshold luminance level to obtain a digitized image thereof, digitizes a present fundus image obtained after the determination of the standard image based on the threshold luminance level to obtain a digitized image thereof and compares the obtained digitized images two-dimensionally to obtain their positional difference, and a display control part for correcting a display position of the present fundus image based on the obtained positional difference to display the corrected image on the monitor.

Fundus observation apparatus

A fundus imaging apparatus comprises: a beam emitter which simultaneously emits a first laser beam and a second laser beam having a different wavelength from the first beam; an irradiation optical system having a beam scanner which scans the emitted first and second beams in two dimensions on a fundus, the irradiation optical system being adapted to irradiate the emitted first and second beams onto the fundus; a first filter which intercepts the first and second beams reflected by the fundus and second fluorescence from the fundus by irradiation of the second beam and transmits first fluorescence from the fundus by irradiation of the first beam; a second filter which intercepts the first and second beams reflected by the fundus and the first fluorescence from the fundus and transmits the second fluorescence from the fundus; an imaging optical system having a photo-receiving element which receives the first fluorescence having passed through the first filter and the second fluorescence having passed through the second filter; a filter changer which continuously alternately disposes the first filter and the second filter in an optical path of the imaging optical system in sync with scanning by the beam scanner; and an image processing part which obtains a first fundus image based on a received light signal of the first fluorescence from the photo-receiving element and obtains a second fundus image based on a received light signal of the second fluorescence from the photo-receiving element.

Fundus imaging apparatus and fundus imaging method

The present invention is intended to provide a corneal surgery apparatus which enables a surgical operator to accurately ablate a cornea in part. The corneal surgery apparatus for ablating part of a cornea by irradiating a laser beam onto the cornea of a patient's eye comprises an irradiation optical system for irradiating the laser beam emitted from a laser light source onto the cornea, an aperture, which is disposed in the irradiation optical system, profiling a cross-sectional region of the beam perpendicular to an optical axis of the irradiation into one or more small regions, and correcting device for correcting an intensity distribution of the laser beam, which is changed when the beam passes through the aperture, to a specified intensity distribution.

Corneal surgery apparatus

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Anjo, Japan

Naoyuki Kondo