Patent ID: 8899752
Filing Date: 2014-12-02
Classification: A61B

Abstract:
1. A visual fatigue level measuring device which measures a level of visual fatigue of a user who is viewing three-dimensional (3D) video, the visual fatigue level measuring device comprising: a video presenting unit configured to present, to the user, left-eye video and right-eye video that are included in the 3D video; a control input unit configured to receive a control by the user with respect to the presented 3D video; a gaze target identifying unit configured to, when the control input unit receives a predetermined control, (i) obtain, from a storing unit, target region information including information for identifying a visual target in the 3D video and information indicating time at which the visual target is presented by the video presenting unit, and (ii) determine that the user was gazing at the visual target in the 3D video presented by the video presenting unit at a time at which the control input unit received the predetermined control, by referring to the obtained target region information; a test period determining unit configured to (i) obtain, from the storing unit, target depth information indicating a depth of the visual target in the 3D video, and (ii) determine two or more time periods based on a depth change of the visual target identified by the gaze target identifying unit, by referring to the obtained target depth information, each of the two or more time periods being a time period for a test for measuring the level of visual fatigue; an eye movement obtaining unit configured to obtain data indicating eye movements of left and right eyes of the user with respect to the 3D video presented by the video presenting unit; an eye movement accumulating unit configured to accumulate the obtained data indicating the eye movements; an eye movement extracting unit configured to extract, from the data accumulated in the eye movement accumulating unit, data indicating the eye movements in each of the two or more time periods determined by the test period determining unit; an eye movement comparing unit configured to compare the eye movements in the two or more time periods based on the data extracted by the eye movement extracting unit; and a fatigue level determining unit configured to determine the level of visual fatigue of the user based on a result of the comparison by the eye movement comparing unit.