Abstract: An improved aircraft vision system includes a display, a system for detecting inconsistencies between a displayed position of a synthetic depiction and the actual position on the display of a runway and/or of an approach lighting system. The inconsistency detection system includes a module for identifying a row of lights extending transversely to the runway, a system for characterising the at least one row of lights identified in order to determine a given position of the at least one row of lights relative to the runway from among a plurality of possible positions extending transversely to the runway and a calculation module configured to calculate an actual position on the display of the runway and/or approach lighting system using the determined position of the at least one row of lights.