Patent ID: 8360578
Filing Date: 2013-01-29
Classification: A61B,G02B,G06F

Abstract:
1. A device for detecting gaze direction of an eye, said device comprising: a first imaging unit to acquire an image of said eye, at least one illuminating unit to provide a first substantially collimated light beam and a second substantially collimated light beam, said collimated light beams having different directions with respect to said device such that said first collimated light beam provides a first reflection spot when light is reflected from the surface of the eye and that said second collimated light beam provides a second reflection spot when light is reflected from the surface of the eye, said reflection spots appearing in said image, a data processing unit to determine the gaze direction of the eye with respect to said device based on the position of said first reflection spot in said image, on the position of said second reflection spot in said image, on the position of the pupil and/or iris of the eye in said image, and on the directions of the collimated light beams, and one or more beam expanders to expand the width of the collimated light beams.