ERIK L. GREVE The 3rd International Visual Field Symposium was held on the 4th till the 6th of May 1978 in Tokyo for the members and guests of the International Perimetric Society. The Proceedings of this symposium follow the general lines of the pro- gramme with some mir alterations. This symposium was a so-called topic-symposium where selected topics were introduced by experts in the field. These topics were: Neuro-ophtha[mo[ogy. 1. Funduscopic correlates of visual field defects. 2. Visual field defects due to tumors of the sellar region. Glaucoma. 1. The earliest visual field defects in glaucoma. 2. The reversibility of glaucomatous visual field defects. Methodology. 1. Automation. 2. The relation between the position of a lesion in the fundus and in the visual field. Apart from the introductory papers, free papers were given on the topics n-topic free papers. and also some Much attention has been given to the discussion. Most of the discussion remarks in this Proceedings are the original taped remarks of the discussion- speakers. We have choosen this form of presentation to take to the reader the athmosphere of the discussion and to preserve originality. The chairman of the sessions have presented a summary or even better an interpretation of the trends in their topics. This introduction gives a short overview of the main themes of the symposium.