Kabushiki Kaisha Topcon

Kazuhiko Yumikake

Yasufumi Fukuma

Hiroyuki Otsuka

Tsutomu Kikawa

Hiroaki Okada

Hisashi Tsukada

Yutaka Nishio

Kinpui Chan

Masahiro Akiba

Hitoshi Shimizu

Takefumi Hayashi

Naoyuki Maeda

Takashi Shioiri

Takeyoshi Nouchi

[Task] To provide a fundus oculi observation device capable of effectively performing dispersion compensation. [Means for Resolution] A fundus oculi observation devicefunctions as an optical image measurement device that splits a broadband light into a signal light LS and a reference light LR, superimposes the signal light LS propagated through a fundus oculi Ef and the reference light LR propagated through a reference mirrorto generate an interference light LC and forms an image of the fundus oculi Ef. The devicecorrects the influence of dispersion of the reference light LR based on ocular information, generates the interference light LC after the correction, detects this interference light LC, and forms an OCT image.

Fundus oculi observation device and program controlling the same

A fundus oculi observation devicedivides a low-coherence light Linto a signal light LS and a reference light LR, superimposes the signal light LS propagated through a a fundus oculi Ef and the reference light LR propagated through a reference mirrorto generate and detect an interference light LC, and forms an OCT image of the fundus oculi Ef based on the result of the detection. The fundus oculi observation devicescans with the signal light LS while changing a scan interval when performing a series of scans with the signal light LS. Thus, it is possible to acquire a highly accurate image at small scan intervals from an attention site, and it is possible to reduce a scanning time by scanning at large intervals in other sites. Accordingly, it is possible to rapidly acquire a highly accurate image of an attention site.

Optical image measurement device and program for controlling the same

A device is an OCT device that splits a low-coherence light into a signal light and a reference light, detects an interference light obtained by superimposing the signal light propagated through an eye and the reference light propagated through a reference mirror, and forms an image of an fundus oculi. The device has a scan unit that scans the eye with the signal light. When a cross-section position is designated in an fundus oculi image, the device repetitively scans with the signal light along each cross-section position to repeatedly forms tomographic images at each cross-section position, thereby displaying a tomographic motion image at each cross-section position on a display. An operator can observe the tomographic motion image to designate the range and timing for measurement of a tomographic still image.

Optical image measurement device

A fundus oculi observation devicesplits a low-coherence light Linto a signal light LS and a reference light LR, generates an interference light LC from the signal light LS propagated through an eye E and the reference light LR propagated through a reference mirrorto detect the interference light LC and, based on the result of the detection, forms a tomographic image of a fundus oculi Ef. The deviceincludes a scan unitconfigured to scan with the signal light LS, and an LCD and optical system that present a fixation target. The deviceacquires an image of the fundus oculi Ef in a state that scan a fixation target is presented while scanning with the signal light LS, and based on the image, determines whether fixation is proper or not.

A fundus observation device which can simultaneously capture both surface images and tomographic images of the fundus oculi is provided. The fundus observation devicehas a fundus camera unitA, an OCT unit, and an arithmetic and control unit. The fundus camera unitA has an illuminating optical systemand an imaging optical system. The arithmetic and control unitforms the surface image of fundus oculi Ef based on signals from fundus camera unitA. The OCT unitdivides low coherence light LO into the signal light LS and the reference light LR, and detects the interference light LC that can be obtained from the signal light LS passing through fundus oculi Ef and the reference light LR passing through reference mirror. The arithmetic and control unitforms tomographic images of fundus oculi Ef based on these detecting results. A Dichroic mirrorcombines the optical path of the signal light LS toward fundus oculi Ef into the optical path for imaging of the imaging optical system, and separates the optical path of the signal light LS towards fundus oculi Ef from the optical path for imaging.

Fundus observation device

A fundus oculi observation device comprises: a first image forming part for optically obtaining data and then forming a fluorescence image of a fundus oculi of an eye administered with a fluorescent agent in advance based on the obtained data; a second image forming part for optically obtaining data and then forming a tomographic image of the fundus oculi based on the obtained data; a display; and a controller for causing said display to display said fluorescence image formed by said first image forming part side-by-side with said tomographic image formed by said second image forming part, as well as to display cross-sectional position information that represents a cross-sectional position of said tomographic image in said fluorescence image by overlapping it with said fluorescent image.

Fundus oculi observation device, a fundus oculi image display device and a fundus oculi image display method

An optical image measurement device comprises: an interference-light generator configured to generate an interference light by splitting a low-coherence light into a signal light and a reference light and superimposing the signal light having passed through an eye and the reference light having passed through a reference object; a detector configured to detect the generated interference light; a calculator configured to obtain intensity distribution of the interference light in the eye, based on a result of the detection by the detector; a determining part configured to determine a projection position of the signal light to the eye, based on the obtained intensity distribution; and an image forming part configured to form an image of the eye, based on a result of detection of a new interference light based on a new signal light projected toward the determined projection position and a new reference light having passed through the reference object.

Optical image measurement device and optical image measurement method

LCDis provided for displaying an internal fixation target for fixating an eye E. Projection optical system (a part of an imaging optical system) is provided for projecting the displayed internal fixation target onto the a fundus oculi Ef. Image forming partis provided for forming 2-dimensional images (images of fundus oculi) Ef of the surface of fundus oculi Ef. Display partA is provided for displaying images of fundus oculi Ef. Operation partB is provided for specifying the position of the displayed images of fundus oculi Ef. Main controlleris provided for changing the projection position of the internal fixation target on the fundus oculi by changing the display position of the fixation target by the LCDbased on the specified position. The image forming partforms tomographic images of the fundus oculi Ef with the internal fixation target projected.

Provided is an optical image measuring apparatus forming a three-dimensional image based on tomographic images of an object, acquired at various depths even when the object moves during measurement. Including a half mirror () for dividing a light beam signal light (S) and reference light (R), a frequency shifter (), a reference mirror () and a piezoelectric element (9A) used to change an optical path length of the reference light (R), CCDs () for receiving interference light beams (L) resulting from interference light produced by superimposing the signal light (S) and the reference light (R) on each other by the half mirror () and outputting detection signals, an image forming portion for forming tomographic images based on the detection signals, a measurement depth calculating means (), and an image processing portion (). Forming a three-dimensional image or the like based on the arranged tomographic images.

Optical image measuring apparatus and optical image measuring method

The ophthalmologic apparatussplits low coherence light LO into a signal light LS and a reference light LR, the interference light LC being generated by having the signal light LS overlap with the reference light LR, and detects this interference light LC. In addition, the apparatus comprises an optical alignment systemA for performing the alignment of an optical system forming the signal light path to the eye E. An intraocular distance calculatordetermines the distance between the position where the signal light LS has been introduced onto the eye E and the position where the signal light LS has been reflected by the fundus oculi E based on length of the optical path of the signal light, the length of the optical path of the reference signal light, the working distance after alignment, and the detection signal output by the CCD(or signal intensity data).

Opthalmologic apparatus

Provided is an optical image measuring apparatus capable of effectively receiving interference light, particularly an alternating current component thereof using a smaller number of photo sensors. The optical image measuring apparatus includes a polarizing plate for converting a light beam from a broad-band light source to linearly polarized light, a half mirror for dividing the light beam into signal light and reference light, a piezoelectric element for vibrating a reference mirror, a wavelength plate for converting the reference light to circularly polarized light, a polarization beam splitter for extracting two different polarized light components from interference light produced from the signal light and the reference light which are superimposed on each other by the half mirror, CCDs for detecting the two different polarized light components, and a signal processing portion for producing an image of an object to be measured based on the detected polarized light components. A frequency for intensity modulation of the light beam is synchronized with a beat frequency of the interference light. A frequency of vibration of the reference mirror is synchronized with the beat frequency of the interference light and an amplitude of vibration thereof is set to be equal to or smaller than a wavelength of the interference light.

Growing community of inventors

Tokyo, Japan

Kazuhiko Yumikake