Patent ID: 9733490
Date: 2017-08-15
CPC Classifications: A61B,G02C

Claim:
1. A spectacle lens design system, comprising: a first photographing apparatus disposed to have a first distance with respect to a subject so as to photograph the subject; a second photographing apparatus disposed to have a second distance with respect to the subject so as to photograph a visual target, the second distance being farther than the first distance; a determination unit configured to determine a position of an eye of the subject based on an image photographed by the first photographing apparatus; a visual target decision unit configured to tentatively calculate a position of the visual target based on an image photographed by the second photographing apparatus, and to decide the position of the tentatively calculated visual target based on a relative positional and pose relationship between the first photographing apparatus and the second photographing apparatus; a visual line information calculation unit configured to calculate visual line information defined when the subject watches the visual target, based on the determined position of the eye and the decided position of the visual target; a shape design unit configured to design a shape of a spectacle lens based on predetermined prescription information and the calculated visual line information; and a pseudo moving unit configured to detect, at predetermined time intervals, a position and a pose of a head of the subject based on the image photographed by the first photographing apparatus, and to move, at predetermined time intervals, the decided position of the visual target, in a pseudo manner, by an amount corresponding to a difference of the position of the head before and after detection and a difference of the pose of the head before and after the detection so that the position and the pose of the head of the subject is maintained, in a pseudo manner, before and after the detection, wherein the visual line information calculation unit calculates the visual line information based on the determined position of the eye and the position of the visual target moved in a pseudo manner.