JP2550128B

PURPOSE:To detect a direction of line of sight in good accuracy by photographing a projection image in the horny coat of an operator by two or more sets of cameras, arranged before the operator, and detecting the direction of an eyeball and a line of sight of the operator being based on coordinates or the like of a light source image, when a light emitting element is successively turned on. CONSTITUTION:An operator 1 mounts a spectacle frame 2, seeing a display part 9. A driving part 5 is turned on successively periodically turning on light emitting elements 31, 32... The lighting is performed in an order successively alternately from both eyes or from one side. By this lighting, a light source image of the light emitting elements 31, 32..., mounted to the spectacle frame 2, is projected on the horny coat 7-2 of an eyeball 6-2. This projection image is photographed by using cameras 10-1, 10-2. In the photographing, so as to obtain the projection image, corresponding to each light emitting element 3, by each camera 10-1, 10-2, automatic focus adjusting parts 11-1, 11-2 are adjusted. Next increasing a focal distance, a part of the eyeball 6-2 is spread and photographed. In this way, detection of good accuracy is performed.