In spite of an unclear definition of Coats disease, this angiomatosis can be defined by the presence of retinal telangiectasis of nondetectable etiology, complicated by severe exudative phenomena. The diagnosis of this serious affection remains difficult because of its numerous clinical forms, which vary according to the age at which the disease appears and the progressive nature of the exudative phenomena. The consequences on the young child are all the more dangerous because it is too often discovered late. It seems necessary to attempt to stop the progression of Coats disease by destroying the telangiectasis responsible for intra- and subretinal exudation. No coagulation technique has been shown to be more effective than others and the predominance of heterogeneous series in the literature makes it difficult to evaluate the therapeutic results. In cases of severe retinal detachment, these coagulations can only be done after the often difficult drainage of the subretinal fluids.