It has been suspected since more than a century that disturbed ocular blood flow (OBF) may play a role in the pathogenesis of glaucoma. Reduced OBF has been measured in glaucoma patients by numberless centres with different techniques in different tissues of the eye. And reduced OBF has been proven to be of prognostic value. Nevertheless the implementation of this knowledge into clinical practice has been very slow. This practical book will help many ophthalmologists to better understand glaucoma. The reading of this book will not only improve patient care but also give the reader intellectual satisfaction.