Kabushiki Kaisha Topcon

Topcon Corporation

Kabuhsiki Kaisha Topcon

Toshifumi Mihashi

Yoko Hirohara

Tatsuo Yamaguchi

Naoyuki Maeda

Katsuhiko Kobayashi

Yasufumi Fukuma

Takashi Fujikado

Naoki Nakazawa

Takefumi Hayashi

Mariko Kobayashi

Fumio Ohtomo

Shinichi Nakamura

Hiroyuki Aoki

Koji Nakajima

Isao Minegishi

Satoru Niimura

Kazuhiro Miyakawa

Yasuko Tsuruga

Koki Harumoto

Hiroyuki Frusho

Teruhito Kuroda

Provided is an ophthalmic measurement device with which it is possible to obtain an area in which a measurement can be taken without moving an optical system. With reference to an optical path length of an illumination optical system with which light is focused on the eyeground when the refraction value is 0 D, the positions of two light sources are set to achieve a setting in which the optical path length becomes slightly shorter. By doing so, it is possible to cope with measurement of refractive properties in a large area without employing structures that allow a lens system of the illumination optical system and the light sources thereof to be moved. In addition, by selecting one of the two light sources so that a clearer Hartmann image can be obtained, it is possible to further increase the precision of the refractive properties to be measured.

Ophthalmic measurement device

The object of the invention is to provide a favorable spectral characteristic that reduces variation depending on the frequency of received light intensity, and that is gentle on a subject eye. It also eliminates displacement between positions of respective spectral images of the same part even if a change in alignment occurs between the eye and apparatus with the lapse of time. An apparatusfor measuring spectral fundus image data of this invention comprises: an illumination optical systemhaving an illumination light sourcethat emits a light beam in a specified wavelength range; a light receiving optical systemfor forming a fundus image on the light receiving surface of a photographing section; a liquid crystal wavelength tunable filtercapable of choosing a wavelength of a transmitted light beam in a specified wavelength range; a spectral characteristic correction filterhaving wavelength characteristic for correcting the wavelength characteristic of the emitted light intensity of the illumination light sourceand the transmission wavelength characteristic of the wavelength tunable filterso that the received light intensity on the light receiving surface is kept within the specified range; and a data measuring sectionfor taking the spectral fundus image data from the light receiving surface while changing the wavelength of the light beam passing through the wavelength tunable filter

Apparatus and method for measuring spectrum image data of eyeground

An eye examination apparatusof the present invention comprises, a refractive power measuring sectionfor measuring refractive powers of subject eyes E of a subject in a binocular viewing state, an eye chart presenting sectionfor presenting a subjective measurement eye chart to be observed by the subject, a correcting sectionfor correcting the subject eyes by referring to data on the refractive powers measured with the refractive power measuring sectionand using the subjective measurement eye chart presented in the eye chart presenting sectionand an optical characteristics measuring sectionfor subjectively measuring an optical characteristic of the subject eyes E corrected or being corrected with the correcting sectionin a state where the subject is binocularly viewing the subjective measurement eye chart.

Device and method for optometry

Scattering can be measured by using an optical system having a Hartman-Shack wave-surface sensor. An eye optical characteristic measuring instrument comprises a light source unitfor emitting a light beam of a wavelength in the near-infrared region, an illumination optical systemfor illuminating a small area of the retinal of an eye to be measured with the light beam from the light source unit, a light-receiving optical systemfor receiving a part of the reflected beam of the light beam from the light source unitreflected from the retina through a converting member for converting the part of the reflected light beam into at least substantiallylight beams, a light-receiving sectionfor receiving the received light beam directed by the light-receiving optical systemand generating a signal, and a calculating unit for determining the wavefront aberration of the light beam entering the light-receiving optical systemand the degree of scattering of the received light beam on the basis of the signal from the light-receiving section

Eye optical characteristic measuring apparatus

A subject is placed in a more natural state or is encouraged to blink at specified intervals to obtain a measurement result under a fixed condition, and the judgment of the degree of dry eye is facilitated. A measurement part obtains, based on a reflected light flux from a subject eye, optical characteristic data of a two-dimensional vector form representing the time course of each optical characteristic of the subject eye in an blink interval from a certain blink to a next blink with respect to the first to the nth blink intervals. An analysis part one-dimensionally arranges each of the optical characteristic data with respect to the first to the nth blink intervals measured by the measurement part, and arranges the one-dimensional arrangement of the optical characteristic in a p-th blink interval at a p column to create a two-dimensional array, and performs a principal component analysis processing on the two-dimensional array.

Ophthalmologic measuring apparatus

An ophthalmic apparatus comprises a projection system in which a pattern member is provided with a predetermined pattern for measuring the shape of the cornea of an eye of a subject, the predetermined pattern is thereby projected on the cornea of the eye of the subject, and an optical observation system in which light flux having a shape of the predetermined pattern emitted from the projection system is reflected at the cornea of the eye of the subject, the eye of the subject is observed by the light reflected by the cornea. A surface at the eye of the subject side of the pattern member is coated with a paint having a filtering property that transmits infrared light and blocks visible light.

Ophthalmic apparatus

There is provided a Shack-Hartmann wavefront sensor which can repetitively perform a measurement at high speed and at short measurement intervals. An illuminating optical system includes a first polarizing optical member to alternately change a polarization condition to a first polarized light or a second polarized light, and illuminates a pulse light from a laser light source part to an ocular fundus of a subject eye through a first polarizing optical member. A light receiving optical system includes a second polarizing optical member to select each polarized light component of the reflected light from the subject eye illuminated according to the polarization condition of the first polarizing optical member, and a first and a second light receiving parts to alternately receive the reflected light of the selected polarized light component. An ophthalmologic measuring apparatus measures the wavefront aberration of the subject eye at short intervals based on the output of the first and the second light receiving parts.

To provide a spectroscopic fundus measuring apparatus capable of identifying each part in spectral fundus images easily and accurately based on its spectral characteristic and a measuring method therefor. A spectral fundus image measuring apparatusof the present invention includes: an illumination optical systema light receiving optical systemfor photographing a series of spectral fundus images of different wavelengths; an image processing sectionfor processing the spectral fundus images; a storage sectionA; and a display sectionB. The image processing sectionhas a position correcting sectionfor correcting the series of spectral fundus images to match the positions of the same parts therein, and an image analyzing sectionfor calculating the spectral characteristic of each part in the spectral fundus images based on the series of spectral fundus images corrected in the position correcting sectionThe storage sectionA stores the spectral characteristics of the parts together with standard spectral characteristics of specific parts. The image processing sectionhas a first grouping sectionA for comparing the spectral characteristic of each part with the standard spectral characteristics of the specific parts to divide the parts into groups corresponding to the specific parts.

Apparatus and method for spectrally measuring fundus

A refraction measuring instrument for measuring the refraction of an eye to be examined while the subject is viewing an external object in a more natural posture. A measuring light beam from a light sourceis reflected from a mirror, shaped into a beam with a ring cross section, directed to a free curved surface prismalong an optical axis O, reflected from a surfaceand a beam splitting surface, guided to an eye E along an optical axis Otogether with the visible light from outside the instrument, and form a ring pattern on the fundus F. The measurement beam reflected from the fundus F is received by a CCDthrough the free curved surface prismand a prism, and a ring pattern is imaged. A calculation control deviceanalyzes the imaged ring pattern and calculates the sphericity, the degree of astigmatism, and the astigmatic axis angle. For measurement, the subject A wears the refraction measuring instrumenton the head H through a wearing section

Refraction measuring instrument

A pulse light source section outputs a plurality of pulse light according to the exposure timing of a retina imaging device. A retina illumination system illuminates the retina of an eye under measurement with the pulse light. A wavefront compensation system illuminates the eye and measures aberrations from a light reflected from the eye. The wavefront compensation system uses a wavefront compensation device and other components to compensate to cancel out measured aberrations. A retina imaging device receives a light which was reflected from the retina and of which the aberrations have been compensated for. A retina observation system forms an image of the retina on the retina imaging device with a light which was reflected and compensated. With the plurality of pulse light output from the pulse light source section, a plurality of consecutive retina images are obtained.

Ophthalmologic imaging apparatus

Horizontal and vertical scanning mirrors for scanning over a large angle, and horizontal and vertical compact scanning mirrors for scanning over a small angle are disposed at pupil-conjugated positions. Light is emitted from a light source to a retina, and reflected light from a broad range of the retina is accumulated by a photodetector. The accumulated light is constructed as a low-magnification retinal image by an image constructing processor. A position for picking up a high-magnification image is indicated on the basis of the constructed low-magnification retinal image. The compact scanning mirrors are rotated so that a high-magnification retinal image is achieved at the indicated pickup position. The photodetector accumulates the reflection light from the retina, and constructs the high-magnification retinal image at the pickup position indicated by the image constructing processor.

Ophthalmologic photographing apparatus

A first wavelength for measurement is selected from among a plurality of wavelengths. Aberrations at the first wavelength are measured with a wavefront-measurement light source having the first wavelength. A compensation optical section performs compensation so as to cancel out the measured aberrations. After the compensation, a retinal image is obtained from a retina imaging device using a retina illumination light source having the same wavelength as the wavefront-measurement light source. During image-data transfer from the retina imaging device, aberrations at a second wavelength are measured using another wavefront-measurement light source having the second wavelength. The compensation optical section performs compensation so as to cancel out the measured aberrations. After the compensation, a retinal image is obtained using another retina illumination light source having the same wavelength as the another wavefront-measurement light source. A difference image is obtained from the retinal images, and displayed or stored.

Light from a light source is divided into S-polarization and P-polarization light. The P-polarization light is incident to a retinal illumination system for high-power image and the S-polarization light is incident to a retinal illumination system for low-power image. These lights are set center illumination and ring illumination by aperture diaphragms. Reflection light flux from a cornea under the high-power retina illumination light passes through the center of a perforated mirror, and thus light reflected from the retina and the perforated mirror is received through a high-power optical system to achieve an excellent retinal image having no flare. Likewise, reflection light flux from the cornea under the low-power retina illumination light is reflected from the perforated mirror, and thus light reflected from the retina and passing through the center of the hole is received through a low-power optical system to achieve an excellent retinal image having no flare.

A portable ophthalmic apparatus () according to the present invention comprises a supporting part () to which a cellular phone () having a photographing camera () is mounted detachably and a main body () which is provided with the supporting part () integrally and has an illumination optical system () projecting an illumination beam toward photographing objective eyes (E) along an illumination optical axis (O) intersected at a predetermined angle with a photographing optical axis (O).

Portable ophthalmic apparatus and ophthalmic system

A contrast chart device of the present invention comprises a contrast target presenting part for presenting a contrast target for a contrast sensitivity test at prescribed timing; a pupil data measuring part for producing an image of an anterior ocular segment of a subject and measuring the diameter or area of a pupil region in the anterior ocular segment; and a measurement timing forming part for forming timing at which the pupil data measuring part performs measurement.

Growing community of inventors

Tokyo, Japan

Toshifumi Mihashi