The Ocular Circulation PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download The Ocular Circulation PDF full book. Access full book title The Ocular Circulation by Jeffrey W. Kiel. Download full books in PDF and EPUB format.
Author: Jeffrey W. Kiel
Publisher: Biota Publishing
ISBN: 1615041699
Category : Medical
Languages : en
Pages : 83
Get Book Here
Book Description
This presentation describes the unique anatomy and physiology of the vascular beds that serve the eye. The needs for an unobstructed light path from the cornea to the retina and a relatively fixed corneal curvature and distance between refractive structures pose significant challenges for the vasculature to provide nutrients and remove metabolic waste. To meet these needs, the ocular vascular beds are confined to the periphery of the posterior two thirds of the eye and a surrogate circulation provides a continuous flow of aqueous humor to nourish the avascular cornea, lens and vitreous compartment. The production of aqueous humor (and its ease of egress from the eye) also generates the intraocular pressure (IOP), which maintains the shape of the eye. However, the IOP also exerts a compressing force on the ocular blood vessels that is higher than elsewhere in the body. This is particularly true for the intraocular veins, which must have a pressure higher than IOP to remain patent, and so the IOP is the effective venous pressure for the intraocular vascular beds. Consequently, the ocular circulation operates at a lower perfusion pressure gradient than elsewhere in the body and is more at risk for ischemic damage when faced with low arterial pressure, particularly if IOP is elevated. This risk and the specialized tissues of the eye give rise to the fascinating physiology of the ocular circulations.
Author: Jeffrey W. Kiel
Publisher: Biota Publishing
ISBN: 1615041699
Category : Medical
Languages : en
Pages : 83
Get Book Here
Book Description
This presentation describes the unique anatomy and physiology of the vascular beds that serve the eye. The needs for an unobstructed light path from the cornea to the retina and a relatively fixed corneal curvature and distance between refractive structures pose significant challenges for the vasculature to provide nutrients and remove metabolic waste. To meet these needs, the ocular vascular beds are confined to the periphery of the posterior two thirds of the eye and a surrogate circulation provides a continuous flow of aqueous humor to nourish the avascular cornea, lens and vitreous compartment. The production of aqueous humor (and its ease of egress from the eye) also generates the intraocular pressure (IOP), which maintains the shape of the eye. However, the IOP also exerts a compressing force on the ocular blood vessels that is higher than elsewhere in the body. This is particularly true for the intraocular veins, which must have a pressure higher than IOP to remain patent, and so the IOP is the effective venous pressure for the intraocular vascular beds. Consequently, the ocular circulation operates at a lower perfusion pressure gradient than elsewhere in the body and is more at risk for ischemic damage when faced with low arterial pressure, particularly if IOP is elevated. This risk and the specialized tissues of the eye give rise to the fascinating physiology of the ocular circulations.
Author: Young H. Kwon
Publisher: Fep International
ISBN: 9780979707513
Category : Medical
Languages : en
Pages : 0
Get Book Here
Book Description
The Patient's Guide to Glaucoma is a very useful educational resource. The authors have done an excellent job of covering the pertinent aspects of glaucoma from the patient's perspective. It provides more complete explanations of aspects of glaucoma care than any other presently available resource. It will be very helpful to patients who want more information about medications, laser, trabeculectomy, tube-shunt surgery, and many other subjects. John S. Cohen, MD Director, Glaucoma Service Cincinnati Eye Institute, Volunteer Clinical Professor University of Cincinnati Drs. Kwon, Greenlee and Fingert are to be congratulated for creating this outstanding educational program on glaucoma. These materials provide an excellent overview of the disease and its treatment. The guide can be read in its entirety or searched to answer specific questions. It is aimed at the intelligent patient seeking to understand his or her disease. The ophthalmologist's best ally in battling glaucoma is a well-informed patient and this guide will serve to develop patients who truly understand their disease. W.L.M. Alward, MD The Frederick C. Blodi Chair in Ophthalmology, Professor of Ophthalmology, Vice-Chair, Dept of Ophthalmology & Visual Sciences, University of Iowa
Author: Helga Kolb
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: Chelvin C. A. Sng
Publisher: Springer Nature
ISBN: 9811556326
Category : Eye
Languages : en
Pages : 203
Get Book Here
Book Description
The book is provided open access under a CC BY 4.0 license. This book covers all aspects of minimally invasive glaucoma surgery (MIGS) and provides detailed information on each MIGS device, including its mechanism of action; patient selection; implantation techniques; post-operative management; and a review of the existing literature. Step-by-step descriptions are provided for the surgical technique used in implanting each MIGS device, accompanied by clear photographs of each surgical stage. Other areas covered include intra-operative gonioscopy (with tips on optimising the view of the anterior chamber angle) and the management of the intra-operative and post-operative complications. Essential information on the anatomy and physiology of the different aqueous outflow pathways is also included. A separate chapter addresses the introduction of MIGS globally, including the consideration of different reimbursement environments and the different types of glaucoma, e.g. angle closure glaucoma. This book will assist both glaucoma surgeons and general ophthalmologists in overcoming the learning curve involved in performed MIGS, by providing valuable and practical clinical pearls.
Author:
Publisher: Academic Press
ISBN: 0128096217
Category : Science
Languages : en
Pages : 350
Get Book Here
Book Description
Piezo Channels, Volume 79, the latest volume in the Current Topics in Membranes series provides the necessary membrane research to assist readers in discovering the current state of a particular field and future directions. New chapters in the updated volume include A Tour de Force: The Discovery, Properties, and Function of Piezo Channels, Piezo1 Channels in Vascular Development and the Sensing of Shear Stress, the Origin of the Force: The Force-From-Lipids Principle Applied to Piezo Channels, Genetic Diseases of PIEZO1 and PIEZO2 Dysfunction, and The Structural Basis for Sensing by the Piezo1 Protein. Users of this series will find an up-to-date presentation of the current knowledge in the field of Piezo Channels. - Written by leading experts in the field - Contains original material, both textual and illustrative, that make it a very relevant reference - Presented in a very comprehensive manner - Ideal reference for both researchers in the field and general readers who will find this book to be relevant and up-to-date
Author: Giovanna Guidoboni
Publisher: Springer Nature
ISBN: 3030258866
Category : Mathematics
Languages : en
Pages : 606
Get Book Here
Book Description
The chapters in this contributed volume showcase current theoretical approaches in the modeling of ocular fluid dynamics in health and disease. By including chapters written by experts from a variety of fields, this volume will help foster a genuinely collaborative spirit between clinical and research scientists. It vividly illustrates the advantages of clinical and experimental methods, data-driven modeling, and physically-based modeling, while also detailing the limitations of each approach. Blood, aqueous humor, vitreous humor, tear film, and cerebrospinal fluid each have a section dedicated to their anatomy and physiology, pathological conditions, imaging techniques, and mathematical modeling. Because each fluid receives a thorough analysis from experts in their respective fields, this volume stands out among the existing ophthalmology literature. Ocular Fluid Dynamics is ideal for current and future graduate students in applied mathematics and ophthalmology who wish to explore the field by investigating open questions, experimental technologies, and mathematical models. It will also be a valuable resource for researchers in mathematics, engineering, physics, computer science, chemistry, ophthalmology, and more.
Author: Neil T. Choplin
Publisher: CRC Press
ISBN: 1482209217
Category : Medical
Languages : en
Pages : 365
Get Book Here
Book Description
Glaucoma affects all age groups and is a leading cause of blindness worldwide. It is imperative that practicing clinicians and surgeons recognize both primary and secondary glaucoma as well as cases of glaucoma associated with other disorders. Atlas of Glaucoma, Third Edition provides an in-depth review and analysis of the management of glaucoma and discusses research advancements that have resulted in the latest therapies. See What's New in the Third Edition: The influence of the cornea on intraocular pressure measurements and new devices designed to account for this Spectral domain optical coherence tomography (OCT) New statistical methods for tracking rates of progression New medications released since 2006 New chapter on trabecular bypass surgery Additional topics include: Classification of glaucoma Measurement of intraocular pressure and gonioscopy The optic nerve Psychophysical and electrophysiological testing in glaucoma Primary open-angle, secondary open-angle, and angle closure glaucomas Ocular blood flow and metabolism Medical therapy and surgical treatments Aqueous shunts Combined cataract and glaucoma surgery Treatment of developmental glaucoma This colorful atlas contains detailed captions for each illustration, making it ideal for teaching purposes as well as a reference for the practicing ophthalmologist. Glaucoma encompasses a wide variety of clinical entities, clinical findings, diagnostic techniques, and treatment options. This book presents a vast assemblage of insight from internationally recognized experts.
Author: Daniel M. Albert
Publisher: Springer
ISBN: 9783030426330
Category : Medical
Languages : en
Pages : 8007
Get Book Here
Book Description
Keeping up to date with advances in comprehensive ophthalmology and in the ophthalmic sub-specialties is extremely difficult because of the accelerating rapidity with which new information and technology become available and the diminishing time and opportunity for practitioners and trainees to read and learn. The first edition of Albert and Jakobiec’s Principles and Practice (1994) was conceived with the idea of utilizing an electronic, updated version in which the chapters were revised by the chapter authors on an annual or semi-annual basis, but the technology was not sufficiently advanced to achieve this goal. Subsequent editions (2000 and 2008) were organized by Saunders and the last published by Elsevier (of which Springer has obtained the complete rights to move forward with the 4th edition, see attachment). For nearly three decades, this text has provided its readers with authoritative and comprehensive coverage of clinical ophthalmology, written and edited by a group of authors who represented a “Who’s Who” in ophthalmology. By using Springer’s Meteor platform, with its ability to allow authors and editors access to updating their chapters online annually/semi-annually, and with the recruitment of select chapter authors, this work’s usefulness as the standard text in ophthalmology will be maintained and expanded upon by Springer. The 4th edition of this comprehensive and authoritative text is written by hundreds of the most distinguished authorities from around the world and edited by four leaders in the field, providing today's best answers to every question that arises in ophthalmology practice. Richly illustrated with thousands of high quality, full color, clinically-relevant images, Albert and Jakobiec's Principles and Practice of Ophthalmology, 4th Edition covers every scientific and clinical principle in ophthalmology, ensuring that the reader will always be able to find the guidance needed to diagnose and manage patients' ocular problems and meet today's standards of care. Written for practicing ophthalmologists and trainees, this book delivers in-depth guidance on new diagnostic approaches, operative techniques, and treatment options, as well as coherent explanations of new scientific concept and its clinical importance. The 4th edition will prove to be the source every practicing clinician needs to efficiently and confidently overcome any clinical challenge they may face. Updates include new chapters on anterior and posterior segment diseases, as well as chapters more focused on treatment, plus thousands of new, high-quality, color images and illustrations, updated references, and information on the most cutting-edge technology used by clinicians in their practices today. Additionally, readers will enjoy the same, user-friendly, full-color design they remember from the previous edition, complete with many at-a-glance summary tables, algorithms, boxes, and diagrams that allow the reader to locate the assistance needed more rapidly than ever.
Author: Institute of Medicine
Publisher: National Academies Press
ISBN: 0309065313
Category : Medical
Languages : en
Pages : 216
Get Book Here
Book Description
Some people suffer from chronic, debilitating disorders for which no conventional treatment brings relief. Can marijuana ease their symptoms? Would it be breaking the law to turn to marijuana as a medication? There are few sources of objective, scientifically sound advice for people in this situation. Most books about marijuana and medicine attempt to promote the views of advocates or opponents. To fill the gap between these extremes, authors Alison Mack and Janet Joy have extracted critical findings from a recent Institute of Medicine study on this important issue, interpreting them for a general audience. Marijuana As Medicine? provides patientsâ€"as well as the people who care for themâ€"with a foundation for making decisions about their own health care. This empowering volume examines several key points, including: Whether marijuana can relieve a variety of symptoms, including pain, muscle spasticity, nausea, and appetite loss. The dangers of smoking marijuana, as well as the effects of its active chemical components on the immune system and on psychological health. The potential use of marijuana-based medications on symptoms of AIDS, cancer, multiple sclerosis, and several other specific disorders, in comparison with existing treatments. Marijuana As Medicine? introduces readers to the active compounds in marijuana. These include the principal ingredient in Marinol, a legal medication. The authors also discuss the prospects for developing other drugs derived from marijuana's active ingredients. In addition to providing an up-to-date review of the science behind the medical marijuana debate, Mack and Joy also answer common questions about the legal status of marijuana, explaining the conflict between state and federal law regarding its medical use. Intended primarily as an aid to patients and caregivers, this book objectively presents critical information so that it can be used to make responsible health care decisions. Marijuana As Medicine? will also be a valuable resource for policymakers, health care providers, patient counselors, medical faculty and studentsâ€"in short, anyone who wants to learn more about this important issue.
Author: J. Robin Harris
Publisher: Springer Science & Business Media
ISBN: 1461303257
Category : Science
Languages : en
Pages : 446
Get Book Here
Book Description
In Volume 25, leading experts present studies on the value of increased ascorbic acid intake and explore its specific contributions to human and animal health.
