This volume contains the papers presented at the International Symposium on Fluorescein Angiography held in Ghent, from 28 march to 1 april 1976, under the presidency of Prof. J. Fran90is. The book has been divided in several chapters corresponding to the sessions of the meeting. The same order has been followed as for the pre sentation of the papers. The discussions, however, immediately follow the papers concerned. During the meeting complications of fluorescein angio graphy have been discussed; this part will be presented as a separate chapter at the end of the volume. I wish to express my gratitude to all who contributed to this volume and to all the participants of ISF A-Ghent. I acknowledge also the cooperation of the publishers Dr. W. Junk, B.V. J.J. De Laey, M.D. XI EDITORIAL We must be respectfully grateful to Her Majesty the Queen, who very kindly extended her high patronage to the International Symposium on Fluorescein Angiography.

Objective look at the subject with more comprehensive coverage than other texts. It examines tumors, phakomatoses, and unusual angiography findings, as well as vascular, acquired, inflammatory, heredodystrophic, toxic and traumatic disorders.

First multi-year cumulation covers six years: 1965-70.

The research workers at the Eye Clinic of the Medical Academy of Erfurt are proud of having been entrusted, for the second time, with the organization of the yearly ISCEV symposium. Twelve years ago the 6th Symposium was held in Erfurt. This time we turned to Reinhardsbrunn, an old castle situated in the vicinity of Erfurt on the fringes of the wonderful mountainscape of the Thuringian Forest. Reinhardsbrunn castle serves today as a holiday hotel and convention place. It seemed to us to be the right place for carrying on the discussions in a comfortable and informal way after the actual sessions were over. Comparing the scientific reports read at the 6th and 17th Symposium, both organized in Erfurt, one readily becomes aware of the impressive advances in our rapidly developing field of interest. The technical and, more specifically, the electronic advancements have been enormous, especially in the field of recording and processing the visually evoked cortical potentials·. Adually, the addition of this special field of study to our realm, led to the renaming of the Society some years ago. Moreover, it became more and more obvious that interdisciplinary cooperation between ophthalmologists, physiologists, physi cists, technologists and mathematicians is essential. This is also reflected in the composition of our membership.