Book excerpt: A basic optics textbook that integrates relevant visual and ophthalmic optics material with basic geometric and physical optics. Dr. Keating's book uses the vergence approach to optics as well as the wavefront approach to vergence as an aid to developing optics intuition. * - Basic textbook on the integrated approach to geometric, physical, and introductory visual optics. * - Features a unique, early emphasis on image formation, the use of the vergence-dioptric power approach from the beginning, the relation of vergence tothe geometric properties of wavefronts, and the interchangeability of the wavefront representation with the ray representation. * - Emphasis on developing intuition and conceptual understanding so that the numbers mean something to the reader.