公开(公告)号：US20170167848A1

公开(公告)日：2017-06-15

申请号：US15322149

申请日：2015-06-29

Applicant: KOWA COMPANY, LTD.

Inventor： Naoki KOBAYASHI ,  Yoshihiro KAKUTANI

IPC: G01B9/02 ,  A61B5/00 ,  A61B3/10

CPC classification number: G01B9/02091 ,  A61B3/10 ,  A61B3/102 ,  A61B5/0066 ,  G01B9/02001 ,  G01B9/02058

Abstract: A measurement optical system (30) is provided which causes measurement light split by a beam splitter (20) to be incident to an object, and a reference optical system (40) is provided which causes reference light split by the beam splitter to be incident to a reference mirror (49). A tomographic image of the object is formed on the basis of interference light generated by superposition of the measurement light reflected at the object to return and the reference light reflected at the reference object to return. Optical components such as lenses and mirrors that constitute the measurement optical system and reference optical system correspond to each other, and the wavelength dispersion characteristics of the optical components in the correspondence relationship are identical or equivalent.

公开(公告)号：US20170135578A1

公开(公告)日：2017-05-18

申请号：US15300191

申请日：2015-03-30

Applicant: KOWA COMPANY, LTD.

Inventor： Toshiaki NAKAGAWA ,  Yoshihiro KAKUTANI ,  Masaharu MIZUOCHI

IPC: A61B3/12 ,  A61B3/10 ,  A61B3/00

CPC classification number: A61B3/1225 ,  A61B3/0025 ,  A61B3/0041 ,  A61B3/102 ,  A61B3/103

Abstract: A three-dimensional tomographic image (B) is formed which is composed of a plurality of two-dimensional tomographic images obtained by scanning an ocular fundus. A contour of a certain 2D region (M1, M2, M3, M4) in the tomographic image is determined for each tomographic image, and the volume of a certain 3D region is calculated through correcting each area of the certain 2D region defined by the determined contour or its accumulated value using an image correction coefficient in accordance with the diopter of the subject's eye. Even for subjects' eyes of different diopters, the influence of the diopter correction is eliminated and a quantitative comparison of subjects' eyes of different diopters is possible.