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公开(公告)号：US20180055358A1
公开(公告)日：2018-03-01
申请号：US15686223
申请日：2017-08-25
Applicant: TOPCON CORPORATION
Inventor： Masashi NAKAJIMA
CPC classification number: A61B3/152 , A61B3/0058 , A61B3/0083 , A61B3/117 , A61B3/14 , A61B3/15
Abstract: An ophthalmic apparatus and method is provided for quickly and accurately aligning a measurement optical system with the vertex of the cornea of a subject's eye. The ophthalmic apparatus comprises a main body, an infrared detection system, a support portion, a driving unit, a visible light irradiation system placed coaxially with the apparatus main body and configured to irradiate the subject's eye, at least two photographing devices configured to substantially simultaneously photograph the subject's eye from different directions, a first alignment detection unit configured to acquire Purkinje images of the subject's eye, originating from infrared light, from at least two photographed images of the subject's eye and detect a position of the subject's eye from the Purkinje images, a second alignment detection unit, and a drive control unit to align the apparatus with the subject's eye.
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公开(公告)号：US20220322935A1
公开(公告)日：2022-10-13
申请号：US17852399
申请日：2022-06-29
Applicant: Topcon Corporation
Inventor： Masaya SUZUKI , Masashi NAKAJIMA , Hitoshi SHIMIZU
Abstract: An ophthalmic apparatus includes a light source, an illumination optical system, an optical scanner, an imaging optical system, and a controller. The illumination optical system is configured to generate slit-shaped illumination light using light from the light source. The optical scanner is configured to deflect the illumination light to guide the illumination light to a fundus of a subject's eye. The imaging optical system is configured to guide returning light of the illumination light from the fundus to an image sensor. The controller is configured to control the image sensor using a rolling shutter method. The illumination optical system includes a slit with a slit-shaped aperture capable of being arranged at a position substantially conjugate optically to the fundus, an iris aperture arranged between the light source and the slit, and configured to be capable of being arranged at a position substantially conjugate optically to an iris of the subject's eye; and an optical element arranged between the light source and the iris aperture, and configured to deflect the light from the light source.
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公开(公告)号：US20240049962A1
公开(公告)日：2024-02-15
申请号：US18118132
申请日：2023-03-07
Applicant: Topcon Corporation
Inventor： Masashi NAKAJIMA , Ryosuke SHIMOSAWA , Shigeru OKIKAWA
CPC classification number: A61B3/10 , A61B3/0025 , A61B3/0008
Abstract: An ophthalmic apparatus includes an objective lens, an illumination optical system, an imaging optical system, and an optical path coupling member. The illumination optical system may illuminate a subject's eye with illumination light via the objective lens. The imaging optical system may guide returning light of the illumination light from the subject's eye to an imaging device via the objective lens. The optical path coupling member has a transparent member with a reflective region formed by evaporating a reflective film onto a part of a transmission region of its surface, and is configured to couple an optical path of the illumination optical system with an optical path of the imaging optical system. The transmission region may be arranged substantially conjugate optically to a subject's iris. The illumination light is reflected on the reflective region and the returning light is transmitted through the transmission region.
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公开(公告)号：US20240000310A1
公开(公告)日：2024-01-04
申请号：US18226802
申请日：2023-07-27
Applicant: Topcon Corporation
Inventor： Toshihiro MINO , Shuyun YEH , Masashi NAKAJIMA , Yasufumi FUKUMA
CPC classification number: A61B3/1005 , A61B3/0025 , A61B3/107 , A61B3/185 , A61B3/117 , A61B3/102 , A61B3/12 , A61B3/135 , A61B3/0058
Abstract: An ophthalmic information processing apparatus includes an acquisition unit and a normalizer. The acquisition unit is configured to acquire eye shape data or an intraocular distance of an eye of a subject. The normalizer is configured to normalize the eye shape data or the intraocular distance based on body data of the subject or a refractive power of the eye of the subject.
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Patent Agency Ranking
公开(公告)号：US20190090736A1
公开(公告)日：2019-03-28
申请号：US16144842
申请日：2018-09-27
Applicant: TOPCON CORPORATION
Inventor： Masashi NAKAJIMA
Abstract: To provide an ophthalmologic device and a pupil state measuring method capable of securing accuracy of a measurement result of objective measurement and effective for investigating the cause of an error during objective measurement. A pupil state measuring method according to the present invention includes: an ocular characteristic measuring step of objectively measuring an ocular characteristic of a subject eye of a subject; an imaging step of substantially simultaneously imaging an anterior ocular segment of the subject eye from different directions using at least two imaging units in measuring the ocular characteristic; a measuring step of analyzing at least one image of images taken by the at least two imaging units to measure a pupil state of the subject eye; and a step of performing the imaging step and the measuring step in measuring the ocular characteristic.
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6.发明公开公开(公告)号：US20240032787A1
公开(公告)日：2024-02-01
申请号：US18118136
申请日：2023-03-07
Applicant: Topcon Corporation
Inventor： Masashi NAKAJIMA , Jun SAKAI
CPC classification number: A61B3/10 , A61B3/0025 , A61B3/0083
Abstract: An ophthalmic apparatus includes an optical system having an illumination and imaging optical systems, a movement mechanism, and a controller. The illumination optical system may illuminate a fundus of a subject's eye with illumination light. The movement mechanism may relatively move the subject's eye and the optical system in an optical axis direction of the imaging optical system. When a corneal curvature radius is R and a distance from a corneal apex position to an imaging aperture conjugate position substantially conjugate optically to the imaging aperture is d, the controller may control the movement mechanism so that light amount of the returning light passing through the imaging aperture becomes less than when a distance in the optical axis direction between the imaging aperture conjugate position and a position of a corneal reflection image of the illumination light is (R/2−d).
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公开(公告)号：US20230404390A1
公开(公告)日：2023-12-21
申请号：US18248373
申请日：2021-10-11
Applicant: TOPCON CORPORATION
Inventor： Masashi NAKAJIMA , Yasufumi FUKUMA , Shu-Yun YEH
CPC classification number: A61B3/1005 , A61B5/4842
Abstract: Disclosed is a myopia progression analysis device including: an eye axial length acquisition section that acquires an eye axial length of an eye of a subject; a reference value acquisition section that acquires a numerical value related to a physical characteristic of the subject other than the eye axial length as a reference value; a relative eye axial length calculator that calculates a relative eye axial length through relativization of the eye axial length acquired by the eye axial length acquisition section using the reference value acquired by the reference value acquisition section; a population information acquisition section that acquires population information which is a set of information about relative eye axial lengths of a plurality of comparison targets to be compared with the subject; and a relative position information calculator.
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公开(公告)号：US20230023425A1
公开(公告)日：2023-01-26
申请号：US17959305
申请日：2022-10-04
Applicant: Topcon Corporation
Inventor： Masaya SUZUKI , Kazuhiro YAMADA , Hitoshi SHIMIZU , Masashi NAKAJIMA
Abstract: An ophthalmic apparatus includes an illumination optical system including a slit in which a slit-shaped aperture is formed and an iris aperture in which two apertures are formed at positions away from an optical axis position, the iris aperture being arranged at a position substantially conjugate optically to an iris of a subject's eye between a light source and the slit, and configured to generate slit-shaped illumination light using light from the light source and to guide the illumination light to a fundus of the subject's eye; and an imaging optical system including an imaging aperture in which an aperture is formed, and configured to guide returning light of the illumination light to an image sensor, the returning light being guided from the fundus by pupil division and passing through the aperture formed in the imaging aperture. A width of the slit-shaped aperture, a distance between the two apertures, and a size of the aperture in the imaging aperture are set so that an overlap region of a light flux region of the illumination light and a light flux region of the returning light is located on a side of the fundus from a posterior surface of lens of the subject's eye within the eye of the subject eye.
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公开(公告)号：US20210338076A1
公开(公告)日：2021-11-04
申请号：US17375026
申请日：2021-07-14
Applicant: Topcon Corporation
Inventor： Masashi NAKAJIMA , Jonathan LIU , Yasufumi FUKUMA
Abstract: An ophthalmic apparatus includes an acquiring unit, an OCT unit, an analyzer, and a calculator. The acquiring unit is configured to acquire a dioptric power in a first region including a fovea of a subject's eye. The OCT unit is configured to acquire OCT data of a fundus of the subject's eye using optical coherence tomography. The analyzer is configured to specify a shape of the fundus by analyzing the OCT data. The calculator is configured to calculate a dioptric power in a peripheral region of the first region of the fundus based on the dioptric power in the first region and the shape of the fundus.
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