Kabushiki Kaisha Topcon

Topcon Corporation

Osaka University

Kabuhsiki Kaisha Topcon

Yoko Hirohara

Toshifumi Mihashi

Naoyuki Maeda

Takashi Fujikado

Tatsuo Yamaguchi

Hiroaki Hashimoto

Naoki Nakazawa

Yasufumi Fukuma

Hiroyuki Aoki

Suguru Miyagawa

Makoto Saika

Yasuko Tsuruga

Takuya Moriyama

Mariko Kobayashi

Koki Harumoto

Hirohisa Nakao

Teruhito Kuroda

An ophthalmologic device includes: a visual target presenting unit configured to present a common visual target to be viewed with both subject's eyes; a presenting distance changing unit configured to change a presenting distance of the visual target presented by the visual target presenting unit from a predetermined far vision distance to a predetermined near vision distance; an ocular characteristic acquiring unit configured to objectively acquire an optical characteristic of the subject's eyes; an addition power adding unit configured to add the addition power to the both subject's eyes; and a control unit configured to cause the presenting distance changing unit to change the presenting distance and the ocular characteristic acquiring unit to continuously acquire the optical characteristic, in a state in which an addition power is added to the both subject's eyes by the addition power adding unit.

Ophthalmologic device and method of operating ophthalmologic 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

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 first illuminating optical system illuminates an eye with a wide beam. A first light receiving unit receives reflection light fluxes from the eye that have been converted into at least 17 beams by a first conversion member. A first compensation optical unit, disposed in the first illuminating optical system, compensates an illuminating light flux to the eye for aberration. A second compensation optical unit, disposed in a first light receiving optical system, compensates a reflection light flux from the eye for aberration. An operation unit determines, based on an output from the first light receiving unit, a compensation amount for cancelling out aberration to deform the first and second compensation optical units and compensate for aberration. The operation unit determines the optical characteristics of the eye, based on an output from the first light receiving unit after compensation, and on compensated optical characteristics.

Eye characteristics measuring system

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.

Contrast chart device, contrast sensitivity measuring device and contrast sensitivity measuring method

In an ophthalmological apparatus, how scattering at an eye under measurement and a contact lens affects how the eye sees is shown by measuring scattering when the contact lens is worn and by comparing a retinal image obtained with aberration and the scattering taken into account and a retinal image obtained with only the aberration taken into account. An aberration measurement section obtains the aberration of the eye under measurement. An other-components measurement section obtains other components other than the aberration component based on a point light-source image caused by each Hartmann plate. A scattering-level calculation section obtains a coefficient expressing the level of scattering based on the other components and the aberration. A simulation section generates a retinal image or data indicating how the eye under measurement sees with the measured aberration and the other components taken into account, based on the aberration and the coefficient.

Opthalmological apparatus

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 substantially 17 light 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 instrument

A device for measuring eye characteristics, an operation device, and the coordinate origin and the coordinate axes of each eye are sufficiently related with one another. A measuring unit () measures eye optical characteristics based on a first light receiving signal from a first light receiving unit (), and measures a cornea topography based on a second light receiving signal from a second light receiving unit (). The measuring unit () also computes an ablation amount based on an aberration result.

Eye characteristics measuring device

A first movement unit for moving a condensing position so that a light flux from a light source is condensed on a place close to a retina of a subject eye, and a second movement unit for optically moving a conversion member for condensing a light flux reflected by the retina and a light receiving part for receiving light fluxes can be independently driven and can be further driven by an operation of an operator. First, an arithmetic part adjusts a projection side and a light receiving side based on first signals from the light receiving part. In a case where an independent mode is selected, the projection side and the light receiving side are adjusted automatically or manually. Further, the arithmetic part measures a characteristic of the eye in accordance with adjusted measurement conditions.

Ophthalmic measuring apparatus

It is possible to estimate optical characteristic according to a pupil diameter in daily life of an examinee, correction data near to the optimal prescription value, eyesight, and sensitivity. A calculation section receives measurement data indicating refractive power distribution of an eye to be examined and pupil data on the eye and calculates lower order and higher order aberrations according to the measurement data and the pupil data (Sto). For example, a pupil edge is detected from the anterior ocular segment image and a pupil diameter is calculated. By using this pupil diameter, lower order and higher order aberrations are calculated. According to the lower order and higher order aberrations obtained, the calculation section performs simulation of a retina image by using high contrast or low contrast target and estimates the eyesight by comparing the result to a template and/or obtains sensitivity (S). Alternatively, according to the lower order and the higher order aberrations obtained, the calculation section calculates an evaluation parameter indicating the quality of visibility by the eye to be examined such as the Strehl ratio, the phase shift (PTF), and the visibility by comparison of the retina image simulation with the template. According to the evaluation parameter calculated, the calculation section changes the lower order aberration amount so as to calculate appropriate correction data for the eye to be examined (S). The calculation section outputs data such as the eyesight, sensitivity, correction data, and the simulation result to a memory or a display section (S).

Ophthalmic data measuring apparatus, ophthalmic data measurement program and eye characteristic measuring apparatus

An eye characteristic measuring apparatus can effectively and properly measure and display wavefront aberration of an eye regardless of the eye state. A first illumination optical system (A) illuminates a small area on a retina of the eye by a first light flux from a first light source unit (). A first reception light optical system (A) leads a part of light flux reflected from the retina () to a first light reception unit () via a first conversion member () for converting the reflected light flux into at least 17 beams. A measurement data judgment unit, for example, judges whether the measurement data is appropriate for calculating the wavefront aberration according to a first signal from the first light reception unit (). For example, when the measurement data judgment unit judges that the measurement data is not appropriate, a first correction unit causes to display a check correction screen which will be detailed later and corrects the data into appropriate measurement data. Furthermore, according to the measurement data judged to be appropriate or the measurement data which has been corrected by the first correction unit (), a calculation unit calculates the wavefront aberration of the eye () as optical characteristic. Moreover, a measurement result judgement unit for example, judges whether the wavefront aberration calculated by the calculation unit is appropriate. Moreover, for example, when the measurement result judgment unit judges that the measurement result is not appropriate, a second correction unit () causes to display the check correction screen and correct the data into appropriate measurement data.

Growing community of inventors

Tokyo, Japan

Yoko Hirohara