The "System of Ophthalmology" is a comprehensive series edited by Sir Stewart Duke-Elder, covering various aspects of ophthalmology. The series is divided into multiple volumes, each focusing on specific areas of ophthalmology. Volume I, "The Eye in Evolution," explores the evolution of the eye and vision in living organisms, from single-celled organisms to vertebrates. It discusses the responses of organisms to light, including metabolic effects, photoperiodism, and the emergence of vision. The volume also delves into the evolution of the visual apparatus, the function of the eyes in animals, and evolutionary byways such as median eyes, rudimentary eyes, and luminous organs. The content is richly illustrated with diagrams and photographs, providing a detailed and illustrated guide to the evolution of vision and the eye.The "System of Ophthalmology" is a comprehensive series edited by Sir Stewart Duke-Elder, covering various aspects of ophthalmology. The series is divided into multiple volumes, each focusing on specific areas of ophthalmology. Volume I, "The Eye in Evolution," explores the evolution of the eye and vision in living organisms, from single-celled organisms to vertebrates. It discusses the responses of organisms to light, including metabolic effects, photoperiodism, and the emergence of vision. The volume also delves into the evolution of the visual apparatus, the function of the eyes in animals, and evolutionary byways such as median eyes, rudimentary eyes, and luminous organs. The content is richly illustrated with diagrams and photographs, providing a detailed and illustrated guide to the evolution of vision and the eye.