ONE OF THE CORE COMPONENTS OF VIRTUAL REALITY IS TRACKING, THEREFORE SOME OF THE IMAGE-BASED TRACKING TECHNIQUES DEVELOPED BY THE COMPUTER VISION COMMUNITY ARE OF POTENTIAL VALUE FOR THIS FIELD. IN THIS WORK WE DESCRIBE A NOVEL METHOD FOR HEAD TRACKING WHICH IS BASED ON GLASSES DETECTION AND DOES NOT REQUIRE CAMERA CALIBRATION. THE METHOD PROVIDES FIVE DEGREES OF FREEDOM WHILE HEAD TRACKING. IT PROVIDES THE REATIVE POSITION OF THE HEAD FROM THE CAMERA (UP TO AN UNKNOWN SCALE FACTOR), AND ITS ROTATION (LINE OF SIGHT).ONE OF THE CORE COMPONENTS OF VIRTUAL REALITY IS TRACKING, THEREFORE SOME OF THE IMAGE-BASED TRACKING TECHNIQUES DEVELOPED BY THE COMPUTER VISION COMMUNITY ARE OF POTENTIAL VALUE FOR THIS FIELD. IN THIS WORK WE DESCRIBE A NOVEL METHOD FOR HEAD TRACKING WHICH IS BASED ON GLASSES DETECTION AND DOES NOT REQUIRE CAMERA CALIBRATION. THE METHOD PROVIDES FIVE DEGREES OF FREEDOM WHILE HEAD TRACKING. IT PROVIDES THE REATIVE POSITION OF THE HEAD FROM THE CAMERA (UP TO AN UNKNOWN SCALE FACTOR), AND ITS ROTATION (LINE OF SIGHT).