The aim of this book is to provide an up-to-date text on ocular dioptrics, the various subjective and objective techniques of refraction, and the optical instruments used in the examination of the eye. Other topics include the side-effects of spectacle and contact-lens corrections and the aberrations of the eye. While the majority of readers will be students of optometry, ophthalmology and ophthalmic dispensing, it is hoped that this book will also serve as a reference work for those already in practice, in addition to optical designers, physicists, psychologists and others engaged in visual science.