1. An automatic accommodative spectacle device for use by a user, comprising: a spectacle frame; one or more focusing elements mounted on the spectacle frame; a scene sensor system including one or more scene sensors for capturing signals of a scene in the user's field of view, including depth information regarding objects in the scene; a scene analyzer for determining a fixation region of interest of the user and a depth of the fixation region of interest based on the signals of the scene; a focus engine coupled to the scene analyzer for determining optimum powers for the focusing elements based on the depth of the fixation region of interest; and a focusing elements controller connected to the focusing elements and the focus engine for controlling optical powers of the focusing elements based on the optimum powers for the focusing elements determined by the focus engine.