TAILIEUCHUNG - ASTIGMATISM – OPTICS, PHYSIOLOGY AND MANAGEMENT

The pig population has also halved over the past fifteen years resulting from a combination of factors including the Euro-pound exchange rate, changes to animal welfare regulations and disease problems (Henry, Baillie & Rushton, 2011). The ‘Foot and Mouth’ (FMD) epidemic of 2001, in conjunction with changes to EU subsidy payments, has also resulted in a reduced sheep population. According to the Department for Environment, Food and Rural Affairs (Defra), the gradual decline in livestock numbers witnessed by the agricultural sector has been developing over recent decades (Defra, 2010). The net effect of this raft of changes and events has. | ASTIGMATISM - OPTICS PHYSIOLOGY AND Management Edited by Michael Goggin Astigmatism - Optics Physiology and Management Edited by Michael Goggin Published by InTech Janeza Trdine 9 51000 Rijeka Croatia Copyright 2012 InTech All chapters are Open Access distributed under the Creative Commons Attribution license which allows users to download copy and build upon published articles even for commercial purposes as long as the author and publisher are properly credited which ensures maximum dissemination and a wider impact of our publications. After this work has been published by InTech authors have the right to republish it in whole or part in any publication of which they are the author and to make other personal use of the work. Any republication referencing or personal use of the work must explicitly identify the original source. As for readers this license allows users to download copy and build upon published chapters even for commercial purposes as long as the author and publisher are properly credited which ensures maximum dissemination and a wider impact of our publications. Notice Statements and opinions expressed in the chapters are these of the individual contributors and not necessarily those of the editors or publisher. No responsibility is accepted for the accuracy of information contained in the published chapters. The publisher assumes no responsibility for any damage or injury to persons or property arising out of the use of any materials instructions methods or ideas contained in the book. Publishing Process Manager Petra Nenadic Technical Editor Teodora Smiljanic Cover Designer InTech Design Team First published February 2012 Printed in Croatia A free online edition of this book is available at Additional hard copies can be obtained from orders@ Astigmatism - Optics Physiology and Management Edited by Michael Goggin p. cm. ISBN 978-953-51-0230-4 INTECH open science I open minds free online editions of

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