This report for the Belgian Ophthalmological Society concerns a number of fundus diseases, which most ophthalmologists only rarely encounter. Still it is of importance that they should be able to recognize them, not only because most of these eye diseases are treatable when they are diagnosed early enough, but also because they are sometimes associated with major visceral and neurological problems. The ophthalmologist may be the first practitioner to suspect a von Hippel-Lindau's disease or a neurofibromatosis. He should realize at that moment that his role is not only to treat the eyes but...