1. A method performed by a device, the method comprising: receiving, at the device, one or more images; analyzing, by the device, the one or more images to determine a relative position of a person's eyes and nose within the one or more images indicative of a position of a person's face relative to a display unit; and adjusting, by the device, a lighting level associated with the display unit proportionately to the extent to which the person's face is facing away from the display unit as determined from the relative position of the person's eyes and nose within the one or more images.