Geometrical and Visual Optics, Third Edition is a rigorous, yet approachable text that expertly combines basic optics with clinical application in a way that brings key optometry topics to life. It is meant to be a concise and user-friendly resource for clinicians as they begin their study of optics, and as they eventually prepare for licensing examinations. The book emphasizes optical concepts and problem-solving skills that underlie contemporary clinical eye care, and because of its clinical utility, a vergence approach is stressed.