this book gives new answers to and insights into how we receive and process visual information from the external world. it focuses on the linkage between accomodation and vergence in the visual system. since many scientific disciplines contribute to this field of study, the book combines a number of articles from different branches doing research in neurobiology. the contributions cover the basic anatomy, physiology and pharmacology of neuromuscular systems, depict new approaches to subclinical aspects of oculomotor vision and show the development of neurobiological methods and concepts for testing models of neuronal networks and functioning of the brain.