[Diffuse unilateral subacute neuroretinitis. Apropos of a case].

Between 1963 and 1973, Gass described in 13 healthy children and young adults the unilateral wipe out syndrome, acquired ocular syndrome affecting only one eye and including marked visual loss. Later, early stages of the disease were analysed and the name of "diffuse unilateral subacute neuroretinitis" (DUSN) was preferred. He suggested that the migration of a worm in the subretinal space over a period of many months or years could be the primary cause of this syndrome. We describe one case of DUSN observed during four years and we discuss the possible clinical aspect of ocular toxocariasis, the difficulty of its biological diagnosis and the mechanisms of retina and pigment epithelium changes.