This book is divided into a number of short chapters with each chapter dedicated to a single theme. For ease of reference, the most commonly useful topics are at the beginning, and topics with narrower appeal, such as ocular aberrations, are placed towards the end. The book is divided into five sections, covering: basic optical structure of the human eye; image formation and refraction of the eye (including refractive errors of the eye, measurement and correction); interactions between light and the eye, considering transmission, reflection and scatter in the media of the eye and at the fundus; aberrations and retinal image quality; depth of field copics and age related changes in the optics of the eye; the book concludes with four appendices, covering mathematics relating to paraxial optics, aberrations theory and image quality criteria and construction data, optical parameters and the aberrations of a number of schematic eyes.