1. Decision device provided for deciding whether an eye having a macula and an optical axis is real or false, said decision device comprising: lighting means emitting an infrared flux towards the eye along an entry axis, an infrared capture means capturing an image of the eye along an exit axis, the entry axis and the exit axis being aligned with the optical axis so that the macula illuminated by the lighting means under the incidence of the entry axis is seen by the capture means, processing means detecting, on an image captured by the capture means, whether a peripheral zone representing the iris exists and whether a central zone in the peripheral zone, a colour of which is representative of the existence of the macula, exists, and delivering information representing this detection, and decision means deciding whether the eyes is real or false according to the information delivered by the processing means.