Light field based eye tracking

A method for eye-tracking using an eye-tracking system comprising a plurality of light-sensing units, each light-sensing unit comprising at least three light sensors and a converging lens employed to converge light signals incident thereupon towards one or more of the at least three light sensors, the method comprising:

• collecting sensor data from individual light sensors of a given light-sensing unit at a given instant of time, the sensor data being indicative of respective light intensities of the light signals sensed by the individual light sensors;
• determining a direction from which the light signals are incident upon the given light-sensing unit at the given instant of time, based on differences in the respective light intensities of the light signals sensed by the individual light sensors;
• determining an orientation of a user's eye relative to the given light-sensing unit at the given instant of time, based on the direction from which the light signals are incident upon the given light-sensing unit and the light intensities of the light signals sensed by the individual light sensors;
• and
• determining a gaze direction of the user's eye at the given instant of time, based on the orientation of the user's eye relative to the given light-sensing unit and a position of the given light-sensing unit relative to the user's eye.