US 10,890,784 B2
Methods, devices, and computer program for determining a near-vision point
Michael Gamperling, Leipheim (DE); Cristina Alvarez Diez, Aalen (DE); and Carsten Glasenapp, Oberkochen (DE)
Assigned to Carl Zeiss Vision International GmbH, Aalen (DE)
Filed by Carl Zeiss Vision International GmbH, Aalen (DE)
Filed on Dec. 9, 2019, as Appl. No. 16/707,112.
Application 16/707,112 is a continuation of application No. PCT/EP2018/065177, filed on Jun. 8, 2018.
Claims priority of application No. 17174925 (EP), filed on Jun. 8, 2017.
Prior Publication US 2020/0110280 A1, Apr. 9, 2020
Int. Cl. G02C 7/02 (2006.01); G02C 13/00 (2006.01); A61B 3/00 (2006.01); A61B 3/113 (2006.01); A61B 3/14 (2006.01)
CPC G02C 7/027 (2013.01) [A61B 3/0025 (2013.01); A61B 3/0091 (2013.01); A61B 3/113 (2013.01); A61B 3/14 (2013.01)] 29 Claims
OG exemplary drawing
 
1. A method for determining a near-vision point, the method comprising:
recording an image of a head of a person with a camera incorporated in a near-vision target while the person is looking at the near-vision target,
wherein the person is optionally wearing a spectacle frame,
wherein the image shows at least one of a pupil position or a cornea position of an eye, and
wherein the near-vision target is movable;
determining an orientation of the near-vision target;
determining a viewing direction of the person when looking at the near-vision target on a basis of the image;
determining the near-vision point on the basis of the image, on the basis of the viewing direction, and a location of a spectacle frame, wherein, if the person is wearing the spectacle frame, the location of the spectacle frame is determined from the image, and, if the person is not wearing the spectacle frame, the location of the spectacle frame is determined virtually on a basis of a model; and
identifying a location of at least one of a pupil position or a cornea position of the eye relative to an axis of symmetry of the camera and an image angle and a resolution of the camera, wherein the direction of the axis of symmetry is determined by the orientation of the near-vision target.