A method for estimating a direction of a subjects gaze includes providing headgear to be worn by the subject, the headgear including an imaging system in operative connection therewith, imaging at least one eyeball using the imaging system over time using light in the visible spectrum, using light in the visible spectrum to determine the position of the iris on a model of the eyeball, and estimating the direction of the subjects gaze from the determined position of the iris on the model of the eyeball.
