1. An eye detection installation comprising: one or more light sources for emitting light in directions toward the head of a user, a detector for receiving light from the head of a user and to repeatedly capture pictures thereof, the detector having a light sensitive surface comprising a plurality of picture elements, and an evaluation unit connected to the detector for determining the position and/or gaze direction of an eye, the evaluation unit being arranged to determine, in a picture captured by the detector, an area in which an image of an eye or images of eyes is/are located, and, after determining the area, to control the detector to forward to the evaluation unit information about successive or following pictures that only corresponds to the determined area of the image captured by the detectors, the detector only reading out information from a portion of the detector's surface that corresponds to the determined area, and thereby, data that are then to be forwarded to the evaluation unit, the determined area representing less than all the picture elements of the light sensitive surface.