This volume presents a basic consensus of how the aqueous humor is formed and exits through the trabecular meshwork and canal of Schlemm. It presents a timely update to current knowledge of the molecular transport mechanisms which underlie aqueous humor dynamics. In addition, it provides a concise description of the clinical approaches used for assessing these basic transport processes. The book emphasizes the phenomenon of the diurnal rhythm of aqueous humor formation, from both the clinical and molecular points of view. This phenomenon provides the major indication that aqueous humor secretion is regulated.