Nagoya-shi, Japan
Nagoya-shi, Japan

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Patent
Tomey Corporation | Date: 2017-03-08

An ophthalmic device is configured to examine at least two eye characteristics including intraocular pressure, and the ophthalmic device includes: an examination optical system configured to obtain examination information of a subjects eye when the at least two eye characteristics of the subjects eye are examined; and an examination window configured to switch. examinations of the at least two eye characteristics. The examination optical system is arranged outside of the examination window. The examination window is capable of rotating independently of the examination optical system. The examinations of the at least two eye characteristics are switched by rotation of the examination window.


Patent
Tomey Corporation | Date: 2016-03-16

Provided is an optical tomographic device for simultaneously acquiring a plurality of tomographic images at a same position in a subject (30) without narrowing a depthwise measurement range. A measurement light generator (21 to 29, 31, 32) generates at least two measurement lights with different optical path lengths, superimposes the at least two measurement lights, radiates the resultant light to a subject (30), and splits reflected light reflected from the subject (30) into at least two reflected lights. A reference light generator (41 to 46, 51) generates at least two reference lights with different optical path lengths. An interfering light generator (60, 70) combines the at least two reflected lights and the at least two reference lights having corresponding different optical path lengths, to generate at least two interfering lights. An interfering light detector (80, 90) detects the at least two interfering lights independently by at least two interfering light detectors (80, 90).


To provide a an anterior ocular segment optical coherence tomographic imaging device and an anterior ocular segment optical coherence tomographic imaging method that can accurately analyze the shape of a crystalline lens by identifying the boundary of each layer of the crystalline lens in a tomographic image of an anterior ocular segment of a subjects eye, which is taken by optical coherence tomography. There is a layer boundary detection means configured to calculate brightness gradients from brightness values in a tomographic image of an anterior ocular segment of a subjects eye, which is taken by optical coherence tomography, in a depth direction of the tomographic image from a cornea to a retina, detect edges b1, b2, b3, and b4 that are larger than a predetermined threshold, and identify a boundary of each layer of the crystalline lens L from positions of the edge b1, b2, b3, and b4.


Patent
Tomey Corporation | Date: 2016-01-28

An ophthalmological device calculates a cornea surface shape of an eye to be examined. The ophthalmological device includes a ring image photographic optical system configured to radiate a plurality of concentric ring light to the cornea surface of the eye and take reflected images of the plurality of ring light reflected from the cornea surface of the eye, an interference optical system configured to radiate measurement light to the eye and detect interfering light composed of reflected light of the measurement light reflected from the eye and predetermined reference light. The shape of the cornea anterior surface of the eye is calculated form the reflected images of the plurality of ring light, the thicknesses of the cornea of the eye at the plurality of incident positions is calculated from the interfering light, and the posterior surface shape of the cornea of the eye is calculated based on these two results.


Patent
Tomey Corporation | Date: 2016-01-29

An ophthalmic device capable of obtaining B-scan graphical images at high speed while eliminating positional displacement due to movement of a subject eye. The device includes: anterior eye image obtaining means configured to obtain an image of an anterior eye of a subject eye; eye fundus image obtaining means configured to obtain an image of an eye fundus of the subject eye; and control means configured to detect a moving distance of the subject eye in the anterior eye image using means configured to calculate correlation between a moving distance of the subject eye in the anterior eye image and a moving distance in the eye fundus image, and to control a position for imaging of the eye fundus image based on the detected moving distance of the subject eye and the calculated correlation.


There is provided a polarization-sensitive optical tomographic imaging apparatus capable of acquiring a two-dimensional or/and three-dimensional tomographic image having higher SNR and quality by cancelling phase change caused by birefringence of a sample in average processing using a predetermined kernel region, and calculating a global phase difference of each pixel in the kernel. The PS-OCT imaging apparatus includes a processing unit configured to: set a predetermined kernel to a B scan image or/and C scan image (volume data) acquired corresponding to a Jones matrix; model the Jones matrix of each pixel in the set predetermined kernel by using one or more unitary matrices to calculate a relative global phase of each pixel, which may be due to speckle noise, for instance; and cancel the calculated relative global phase in each pixel in the predetermined kernel to average each element of the Jones matrix in the predetermined kernel.


An anterior ocular segment optical coherence tomographic imaging device and an anterior ocular segment optical coherence tomographic imaging method that can accurately analyze the shape of a crystalline lens by identifying the boundary of each layer of the crystalline lens in a tomographic image of an anterior ocular segment of a subjects eye, which is taken by optical coherence tomography. A layer boundary detector calculates brightness gradients from brightness values in a tomographic image of an anterior ocular segment of a subjects eye, which is taken by optical coherence tomography, in a depth direction of the tomographic image from a cornea to a retina, detect edges b1, b2, b3, and b4 that are larger than a predetermined threshold, and identify a boundary of each layer of the crystalline lens L from positions of the edge b1, b2, b3, and b4.


Patent
Tomey Corporation | Date: 2016-08-03

The invention describes an ophthalmic device capable of obtaining B-scan graphical images at high speed while eliminating positional displacement due to movement of a subject eye. The device includes: anterior eye image obtaining means configured to obtain an image of an anterior eye of a subject eye; eye fundus image obtaining means configured to obtain an image of an eye fundus of the subject eye; and control means configured to detect a moving distance of the subjects eye in the anterior eye image using means configured to calculate correlation between a moving distance of the subjects eye in the anterior eye image and a moving distance in the eye fundus image, and to control a position for imaging of the eye fundus image based on the detected moving distance of the subjects eye and the calculated correlation.


Patent
Tomey Corporation | Date: 2016-02-10

Optical coherence tomography (OCT) apparatuses and methods include a first electro-magnetic radiation (EMR) source providing EMR to a first optical path associated with a sample and a second optical path associated with a reference. A multi-beam generator unit (MBGU) generates first and second EMR beams having different wavelength contents. A scanning system illuminates the sample with the first and second EMR beams, at a first and second time, at a first and second location. An interference module generates interference signals based on received EMR returning from the reference and the first and second EMR beams returning from the sample. A detector generates detection signals based on received interference signals and a processor generates OCT data based on the processed detection signals. In some embodiments, three EMR beams having different wavelength contents with linearly independent vectors illuminate at least one same location of the sample.


Patent
Tomey Corporation | Date: 2016-08-03

An ophthalmological device calculates a cornea surface shape of an eye to be examined. The ophthalmological device includes a ring image photographic optical system configured to radiate a plurality of concentric ring light to the cornea surface of the eye and take reflected images of the plurality of ring light reflected from the cornea surface of the eye, an interference optical system configured to radiate measurement light to the eye and detect interfering light composed of reflected light of the measurement light reflected from the eye and predetermined reference light. The shape of the cornea anterior surface of the eye is calculated form the reflected images of the plurality of ring light, the thicknesses of the cornea of the eye at the plurality of incident positions is calculated from the interfering light, and the posterior surface shape of the cornea of the eye is calculated based on these two results.

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