Download or read book Webvision written by Helga Kolb and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Light Exposure on the Melanopsin Driven Pupil Response and Circadian Rhythm written by Kaleb S. Abbott and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Exposure to increasing amounts of artificial light during the night may contribute to the high prevalence of reported sleep dysfunction. Release of the sleep hormone melatonin is mediated by the intrinsically photosensitive retinal ganglion cells (ipRGCs). ipRGCs signal environmental light, with pathways to the midbrain to control pupil size and circadian rhythm. Evidence suggests that light exposure plays a role in refractive error development. This study sought to investigate whether melatonin level and sleep quality can be modulated by decreasing nighttime input to the ipRGCs. Another goal was to investigate links between light exposure, ipRGCs, refractive error, and sleep. Methods: Experiment 1: Subjects (ages 17-42, n=21) wore short wavelength-blocking glasses prior to bedtime for two weeks. The ipRGC-mediated post illumination pupil response (PIPR) was measured before and after the experimental period. Stimulation was presented with a Ganzfeld stimulator, including 1 second (s) and 5 s long and short wavelength light, and the pupil was imaged with an infrared camera. Pupil diameter was measured before, during and for 60 s following stimulation, and the 6 s and 30 s PIPR and area under the curve (AUC) following light offset were determined. Subjects wore an Actigraph device for objective measurements of activity, light exposure, and sleep. Saliva samples were collected to assess melatonin content. The Pittsburgh Sleep Quality Index (PSQI) was administered to assess subjective sleep quality. Experiment 2: Fifty subjects, aged 17-40, participated (19 emmetropes and 31 myopes). A subset of subjects (n = 24) wore an Actiwatch Spectrum for one week. The Pittsburgh Sleep Quality Index (PSQI) was administered, and saliva samples were collected for melatonin analysis. The post illumination pupil response (PIPR) to 1 second (s) and 5s long and short wavelength stimuli was measured. Pupil metrics included the 6s and 30s PIPR and early and late area under the curve. Results: Experiment 1: Subjects wore the blue-blocking glasses 3:57 ± 1:03 hours each night. After the experimental period, the pupil showed a slower redilation phase, resulting in a significantly increased 30 s PIPR to 1 s short wavelength light, and decreased AUC for 1 s and 5 s short wavelength light, when measured at the same time of day as baseline. Nighttime melatonin increased from 16.1 ± 7.5 pg/mL to 25.5 ± 10.7 pg/mL (p
Download or read book Neuronal Input Pathways to the Brain s Biological Clock and their Functional Significance written by Jens Hannibal and published by Springer Science & Business Media. This book was released on 2006-06-07 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rhythmic changes in physiology and behaviour within a 24 h period occur in living organisms on earth to meet the challenges associated with the daily changes in the external environment. The circadian pacemaker responsible for the temporal internal organisation and the generation of endogenous rhythms of approximately 24 h is located in the hypothalamic suprachiasmatic nucleus (SCN) in mammals. The endogenous period generated by the pacemaker is close to, but generally not equal to 24 h and the biological clock therefore needs to be daily adjusted (entrained) by external cues. The daily alteration of light and darkness due to the rotation of our planet on its own axis in relation to the sun is the most prominent "zeitgeber" which adjusts the phase of the circadian rhythms to the astronomical day length, a process known as photoentrainment. In mammals, light is perceived only through photoreceptors located in the retina. Light information is mediated to the SCN via the retinohypothalamic tract (RHT) by activation of the classical photoreceptor system of rods and cones and a more recently identified system of intrinsic photosensitive retinal ganglion cells (ipRGCs) using melanopsin as a photopigment.
Download or read book The Pupil Behavior Anatomy Physiology and Clinical Biomarkers written by Andrew J. Zele and published by Frontiers Media SA. This book was released on 2020-06-22 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
Download or read book Pediatric Neuro Ophthalmology written by Michael C. Brodsky and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pediatric Neuroophthalmology details the diagnostic criteria, current concepts of pathogenesis, neuroradiological correlates, and clinical management of a large group of neuroophthalmic disorders that present in childhood. Surprisingly distinct from neuroophthalmic disorders afflicting adults, this set of diseases falls between the cracks of most ophthalmology training, and thus, warrants a practical, clinical guide for the practitioner in ophthalmology - the neuroophthalmologist, pediatric ophthalmologist, general ophthalmologist - as well as neurologists and for residents. The authors, leading pediatric ophthalmologists, have taken this difficult subject matter and developed an accessible, user-friendly manual with a detailed approach to the recognition, differential diagnosis, and management of pediatric neuroophthalmologic disorders.
Download or read book Light and Biological Rhythms in Man written by L. Wetterberg and published by Pergamon. This book was released on 1993 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this volume, current knowledge on light as a regulator of biological rhythms is considered from both basic science and clinical perspectives. Chapters by leading experts cover the whole range of biological rhythms, from infradian and circadian to the longer ultradian rhythms, in a wide variety of mammalian species. The chapters on humans provide a basis on which to establish mechanisms for mediating the therapeutic and physiologically beneficial effects of light as a regulator of rhythms in health and disease.
Download or read book Anatomy Ocular physiology Biochemistry and genetics Pathology Microbiology Immunology Growth and senescence Optics Therapeutics Lasers and instrument technology Basic biostatistical and epidemiological terms written by Louise Bye and published by OUP Oxford. This book was released on 2013-05-23 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: An indispensable and fully comprehensive textbook, this covers the basic sciences in ophthalmology and is the only book you need to pass the FRCOphth Part 1 exam.
Download or read book Seasonal Affective Disorder written by Timo Partonen and published by Oxford University Press. This book was released on 2010 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seasonal affective disorder (SAD), or winter depression, is a mood disorder related to the change in the seasons and lack of exposure to daylight. It affects 1 in 100 adults in western countries. SAD is a rare example of a psychiatric disorder with a clear, identifiable biological cause. The new edition of this award winning book brings together distinguished scientists and opinion leaders to discuss the current and anticipated developments in the study and care of Seasonal Affective Disorder. Highlighting the clinical diagnosis and management of Seasonal Affective Disorder (SAD), this book provides a valuable resource for all whom are involved in the health care for patients with SAD. This book deals with the range of therapeutic measures that are available for the treatment of SAD. In addition, this book elucidates potential areas of research that have emerged such as the study of the circadian pacemaker and the night-time sleep structure and their interaction that influences mood.
Download or read book Integrative Ophthalmology written by Ningli Wang and published by Springer Nature. This book was released on 2019-09-05 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the development of nature science and industrial technology, more and more patients are benefitting from the rapid progress in ophthalmology, as the use of new medicine and delicate surgical therapy has ensured them the chance to restore their sight. However, some problems have come up during its development, of which the most serious one is the limitation of the ophthalmology. Eyes are not isolated organs, they are connected to our body, and thus, the general status of our body will affect the eyes’ function. Therefore, it is of great importance that the ophthalmologists see the big picture while dealing with the clinical problems. Based on the above observations, we put forward the concept of Integrative Ophthalmology, and describe the ophthalmology related medical situations that are prone to be neglected in clinical practice in a bid to increase the awareness of doctors from all fields that a holistic view should be adopted in clinical practice, and it is the patients that we are treating rather than the disease. There are 9 parts in the book, containing the concept of integrative ophthalmology, intraocular and intracranial pressure gradient related diseases,and the relationship between the different general status and eye disorders. We do believe that the integrative ophthalmology is the key to the development of ophthalmology and hope readers can benefit from this book.
Download or read book Melatonin and the Mammalian Pineal Gland written by Josephine Arendt and published by Springer Science & Business Media. This book was released on 1994-12-31 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides the reader with an overview of an intriguing and interdisciplinary field of research. For the first time the mammalian pineal gland, its mode of action and its physiological effects are discussed in a comprehensive, single-authored work.
Download or read book Introduction to Human Factors and Ergonomics written by Robert Bridger and published by CRC Press. This book was released on 2017-10-30 with total page 975 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building on the success of previous editions, the 4th edition of ‘Introduction to Human Factors and Ergonomics’ provides a comprehensive and up to date introduction to the field. The new edition places the subject matter into a system context using a human-machine model to structure the chapters and a knowledge application model to structure the organisation of material in each chapter. Every chapter covers: Core Concepts, Basic Applications, Tools and Processes, and System Integration issues regardless of topic. Includes over 200 exercises and essays (at least ten per chapter). An Instructor’s Manual, A Guide to Tutorials and Seminars and and over 500 powerpoint slides are available for academic users from the publisher. All chapters contain ‘HFE Workshop’ sections with practical guidance and worked examples. Please see the TOC for more information.
Download or read book Role of Melatonin and Pineal Peptides in Neuroimmunomodulation written by Franco Fraschini and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research related to the pineal gland has advanced rapidly in the last three decades since the discovery of its most important hormone, melatonin. This indoleamine has been shown to have a large variety of effects in the organism; the bulk of these actions were initially thought to relate the pineal gland to the reproductive and endocrine systems. It is now apparent, however, that the physiologic interactions of the pineal and its hormones far transcend its control of endocrine function. One field of pineal research that has developed rapidly within the last 5 years has been the demonstration of its relationship to the immune system. Since the pineal gland is part of the central nervous system, these observations generally fall in the category of neuroimmunology, an area that, in its own right, has received a great deal of attention in the last decade. Thus, a NATO Advanced Study Course entitled "Role of Melatonin and Pineal Pep tides in Neuroimmunomodulation" was convened in Erice, Sicily, on June 3-9, 1990. This book is a result of the scientific presentations given at the workshop. The contributions to the book include mini-review articles which summarized the presentations of the invited speakers as well as a selected number of brief communications where the subject matter was in line with the theme of the Advanced Study Course.
Download or read book The Retina written by John E. Dowling and published by Harvard University Press. This book was released on 2012-01-15 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: John Dowling’s The Retina, published in 1987, quickly became the most widely recognized introduction to the structure and function of retinal cells. In this Revised Edition, Dowling draws on twenty-five years of new research to produce an interdisciplinary synthesis focused on how retinal function contributes to our understanding of brain mechanisms. The retina is a part of the brain pushed out into the eye during development. It retains many characteristics of other brain regions and hence has yielded significant insights on brain mechanisms. Visual processing begins there as a result of neuronal interactions in two synaptic layers that initiate an analysis of space, color, and movement. In humans, visual signals from 126 million photoreceptors funnel down to one million ganglion cells that convey at least a dozen representations of a visual scene to higher brain regions. The Revised Edition calls attention to general principles applicable to all vertebrate retinas, while showing how the visual needs of different animals are reflected in their retinal variations. It includes completely new chapters on color vision and retinal degenerations and genetics, as well as sections on retinal development and visual pigment biochemistry, and presents the latest knowledge and theories on how the retina is organized anatomically, physiologically, and pharmacologically. The clarity of writing and illustration that made The Retina a book of choice for a quarter century among graduate students, postdoctoral fellows, vision researchers, and teachers of upper-level courses on vision is retained in Dowling’s new easy-to-read Revised Edition.
Download or read book Pituitary Adenylate Cyclase Activating Polypeptide written by Hubert Vaudry and published by Springer Science & Business Media. This book was released on 2003 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pituitary Adenylate Cyclase-Activating Polypeptide is the first volume to be written on the neuropeptide PACAP. It covers all domains of PACAP from molecular and cellular aspects to physiological activities and promises for new therapeutic strategies. Pituitary Adenylate Cyclase-Activating Polypeptide is the twentieth volume published in the Endocrine Updates book series under the Series Editorship of Shlomo Melmed, MD.
Download or read book Human Circadian Physiology written by Charles A. Czeisler and published by . This book was released on 1978 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Retinal Development written by Evelyne Sernagor and published by Cambridge University Press. This book was released on 2012-11-29 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: This advanced text, first published in 2006, takes a developmental approach to the presentation of our understanding of how vertebrates construct a retina. Written by experts in the field, each of the seventeen chapters covers a specific step in the process, focusing on the underlying molecular, cellular, and physiological mechanisms. There is also a special section on emerging technologies, including genomics, zebrafish genetics, and stem cell biology that are starting to yield important insights into retinal development. Primarily aimed at professionals, both biologists and clinicians working with the retina, this book provides a concise view of vertebrate retinal development. Since the retina is 'an approachable part of the brain', this book will also be attractive to all neuroscientists interested in development, as processes required to build this exquisitely organized system are ultimately relevant to all other parts of the central nervous system.
Download or read book The Circadian Code written by Satchin Panda, PhD and published by Rodale Books. This book was released on 2018-06-12 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: When we eat may be as important as what we eat. Like most people, you probably wake up, get hungry for meals and doze off in bed around the same time every day. If you’ve ever experienced jet lag or pulled an all-nighter, you know that this schedule can easily be thrown off kilter. But for some people, that imbalance—difficulty sleeping at night, hunger at odd times, or sudden fatigue at noon—is a constant. If you're one of those people, Dr. Satchin Panda, one of the leading researchers on circadian rhythms, has a plan to reset your body clock. Beginning with an in-depth explanation of the circadian clock—why it’s important, how it works, and how to know it isn’t working—The Circadian Code outlines lifestyle changes to make to get back on track. It's a concrete plan to enhance weight loss, improve sleep, optimize exercise, and manage technology so that it doesn’t interfere with your body’s natural rhythm. Dr. Panda’s life-changing methods show you how to prevent and reverse ailments like diabetes, cancer, and dementia, as well as microbiome conditions like acid reflux, heartburn, and irritable bowel disease.
