1. A process for the detection of a visibility interference phenomenon comprising the following steps: emission of a beam of light from a vehicle, said beam of light being emitted into a field of vision of a camera of the vehicle; and determining the presence and the nature of the visibility interference phenomenon on the basis of at least one image of said beam of light captured by the camera; and wherein the determination of the nature of the visibility interference phenomenon is effected on the basis of a homogeneity of said visibility interference phenomenon on the image; said visibility interference phenomenon and said determining step being effected by using said at least one image of said beam of light that is emitted into said field of said camera.