David Lindberg presents the first critical edition of the text of Roger Bacon's classic work Perspectiva, prepared from Latin manuscripts, accompanied by a facing-page English translation, critical notes, and a full study of the text. Also included is an analysis of Bacon's sources,influence, and role in the emergence of the discipline of perspectiva. About Roger Bacon: Roger Bacon (c.1220-c.1292) is one of the most renowned thinkers of the Middle Ages, a philosopher-scientist praised and mythologized for his attack on authority and his promotion of what he called experimental science. He was a leading figure in the intellectual life of the thirteenth century, acampaigner for educational reform, and a major disseminator of Greek and Arabic natural philosophy and mathematical science. About Perspectiva: The science that Roger Bacon most fully mastered was perspectiva, the study of light and vision (what would later become the science of optics). His great treatment of the subject, the Perspectiva, written in about 1260, was the first book by a European to display a full mastery of Greek andArabic treatises on the subject, and through it Bacon was instrumental in defining this scientific discipline for the next 350 years.