The visual field refers to the total area in which objects can be seen in the side (peripheral) vision when the eyes are focused on a central point. Glaucoma is a condition of the eye in which the optic nerve is damaged due to increased fluid pressure in the eye. If untreated or uncontrolled, glaucoma first causes peripheral vision loss and eventually can lead to blindness. A visual field test is a method of measuring an individual's entire scope of vision, that is their central and peripheral (side) vision. The test is most frequently used to help detect glaucoma but may also be used for detection of central or peripheral diseases of the retina, eyelid conditions such as drooping (ptosis), optic nerve damage and disease, and conditions affecting the visual pathways from the optic nerve to the area of the brain (occipital cortex) where this information is processed into vision. The fourth edition of this comprehensive text provides ophthalmologists and trainees with a guide to the interpretation of visual field tests and subsequent diagnosis and management of ocular disorders. The book has been fully revised and features additional topics including two new classification systems for glaucoma. Nearly 800 clinical photographs and diagrams further enhance learning. Key points Comprehensive guide to interpretation of visual field tests and diagnosis of ocular disorders Fully revised fourth edition featuring many new topics Features nearly 800 clinical photographs and diagrams Previous edition (9788184488661) published in 2008
This book focuses on the practical aspects of Optical Coherence Tomography (OCT) in glaucoma diagnostics offering important theoretical information along with many original cases. OCT is a non-invasive imaging technique that acquires high-resolution images of the ocular structures. It enables clinicians to detect glaucoma in the early stages and efficiently monitor the disease. Optical Coherence Tomography in Glaucoma features updated information on technical applications of OCT in glaucoma, reviews recently published literature and provides clinical cases based on Cirrus and Spectralis OCT platforms. In addition, newer techniques like event and trend analyses for progression, macular ganglion cell analysis, and OCT angiography are discussed. This book will serve as a reference for ophthalmologists and optometrists worldwide with a special interest in OCT imaging providing essential guidance on the application of OCT in glaucoma.
Maximum oxygen uptake during exercise is one of the best predictors of operative mortality and of prognosis in chronic cardiac or respiratory disease. Cardio-pulmonary exercise (CPEX) tests are therefore an increasingly common component of pre-operative assessment and the management of patients with chronic cardiopulmonary problems. Part of the Oxford Respiratory Medicine Library (ORML) series, this pocketbook guides clinicians through the parameters measured in CPEX testing so that they can understand the underlying physiology and are able to interpret the results. Clinical scenarios, common patterns, key points, and practical tips all make this book easy to follow, even for those readers who have little prior knowledge of the subject.
Written at an introductory level, and featuring engaging case examples, this book reviews the theory and practice of personal and egocentric network research. This approach offers powerful tools for capturing the impact of overlapping, changing social relationships and contexts on individuals' attitudes and behavior. The authors provide solid guidance on the formulation of research questions; research design; data collection, including decisions about survey modes and sampling frames; the measurement of network composition and structure, including the use of name generators; and statistical modeling, from basic regression techniques to more advanced multilevel and dynamic models. Ethical issues in personal network research are addressed. User-friendly features include boxes on major published studies, end-of-chapter suggestions for further reading, and an appendix describing the main software programs used in the field.
When children and adults apply for disability benefits and claim that a visual impairment has limited their ability to function, the U.S. Social Security Administration (SSA) is required to determine their eligibility. To ensure that these determinations are made fairly and consistently, SSA has developed criteria for eligibility and a process for assessing each claimant against the criteria. Visual Impairments: Determining Eligibility for Social Security Benefits examines SSA's methods of determining disability for people with visual impairments, recommends changes that could be made now to improve the process and the outcomes, and identifies research needed to develop improved methods for the future. The report assesses tests of visual function, including visual acuity and visual fields whether visual impairments could be measured directly through visual task performance or other means of assessing disability. These other means include job analysis databases, which include information on the importance of vision to job tasks or skills, and measures of health-related quality of life, which take a person-centered approach to assessing visual function testing of infants and children, which differs in important ways from standard adult tests.
Eye tracking is a widely used research method, but there are many questions and misconceptions about how to effectively apply it. Eye Tracking the User Experience—the first how-to book about eye tracking for UX practitioners—offers step-by-step advice on how to plan, prepare, and conduct eye tracking studies; how to analyze and interpret eye movement data; and how to successfully communicate eye tracking findings.
A comprehensive survey on the use of bedside skills and perimetric devices to the test visual fields, and how to interpret the results. To develop the clinician's interpretative skills, the authors include a chapter on visual anatomy and an atlas of 100 real-life cases arranged in anatomic order from retina to striate cortex. By placing a brief clinical vignette with a visual field on one side of the page and a description of the field and its causal lesion on the opposite side, the reader will be able to learn interpretation in a simulated clinical setting. An additional quiz section of twenty randomly arranged visual fields provides readers with an opportunity to test their newly acquired skills.
Containing focused, comprehensive coverage, Practical Guide to Interpretive Near-Infrared Spectroscopy gives you the tools necessary to interpret NIR spectra. The authors present extensive tables, charts, and figures with NIR absorption band assignments and structural information for a broad range of functional groups, organic compounds, and
Concise introduction and reference that may be used by busy practitioners and in training programs as a practical guide for clinical automated perimetry and particularly visual field testing using the Humphrey perimeter.
`Every now and then one stumbles across a breath of fresh air and this practical research guide is certainly one of them!.. It will be no doubt refreshing for those of us who keep going to the field and who perhaps have forgotten the human dimension of research. For those who supervise students the book will be a useful source of inspiration.... I shall certainly recommend the book to any of my students' - Development and Change `Development Fieldwork is an excellent examination of and preparation for development research and will be an invaluable guide to all those entering or considering fieldwork, wherever that may be' - Progress in Development Studies `I would strongly recommend it as a field textbook across a range of disciplines and topics. The tone is thoughtful, engaging and pragmatic, with all of the chapters contributing equally to a very high quality publication. It is the best book I have read on fieldwork for a while. It is essential for anyone contemplating 'development' based study, but it also contains a great deal of value and interest to geographers, sociologists and other students working in and on the West' - Singapore Journal of Tropical Geography 'This is an outstanding book, and one that all of us engaged in fieldwork in "developing countries" will want to read and doubtless re-read. Thoughtful, relevant and consistently well-written' - Professor Stuart Corbridge, London School of Economics and University of Miami 'An excellent overview of the pitfalls and problems of fieldwork in remote places... elegant and enjoyable, incisive and elegant... good humoured and eminently practical - the "Lonely Planet" guide to the field' - Professor John Connell, Sydney University 'A very welcome and richly inviting review of the politics, ethics and practicalities of fieldwork, Development Fieldwork deserves reading in many 'fields'. This will surely travel far' - James D Sidaway, National University of Singapore 'I warmly commend this guide to anyone planning or even thinking about fieldwork in the Third World. Postgraduates and academics will find it particularly good, as it not only raises an abundance of practical and logistical points but explores fundamental ethical and epistemological concerns to an unusual degree, including issues not addressed elsewhere. The clarity and attention to detail are also very welcome, as is the ease with which the book can be navigated' - Janet Townsend, University of Durham `Developmental Fieldwork provides a useful guide packed with information on practical and personal (and sometimes political) matters. As with all good `rough' guides, rather than fixing options and closing issues, the authors make it a point to suggest flexible itineraries across the terrain of the `field'. The book should in time become a well-thumbed, dog-eared volume, thrown into the haversack along with the notebook (both sorts), tape recorder, mosquito repellent, sunglasses and sturdy shoes' - Brenda S A Yeoh, National University of Singapore 'A good introductory text that will assist the novice development researcher to prepare for a new experience and will also provide a timely reminder for more experienced researchers' - Evaluation Journal of Australasia Development Fieldwork provides an indispensable new resource and guide for all students undertaking development fieldwork in the Third World. Accessible and lively, the text: - introduces the basics of research design and methodology together with guidance on choosing the best research methods; - provides `hands on' advice (practical, personal and ethical) to those preparing to enter `the field'; - covers the initial planning and preparation stages to end writing up and tips for the successful resumption of life back home. The authors draw upon a rich and diverse set of fieldwork experiences across the developing world (rural and urban) and utilize case studies to illustrate the many common issues and challenges that will face both new and experienced fieldwork researchers. It will be an essential text and companion to all postgraduate and research students across the social sciences.
