A technique for the treatment within the framework of the structural theory of certain characterological, schizophrenic and schizoaffective disorders has been presented through the presentation of a fragment of an analysis in which have been interpolated explanatory remarks. Problems pertaining to diagnosis have been discussed. The analysand had a symptom complex, a visual trauma followed by sensations of blackness in the head and the development of a figurative halo, strongly reminiscent of the syndrome described by Greenacre: vision, headache and the halo. The symptom-complex had similar origins and psychological uses as that of Greenacre's patients. Its analysis was crucial to the apparently satisfactory result which was achieved in an unusually short time.