The Optical Effects Of Tear Film Disruption

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The Optical Effects of Tear Film Disruption

Author : Ronald Cogswell Tutt
Publisher :
ISBN 13 :
Total Pages : 162 pages
Book Rating : 4.3/5 ( download)

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Book Synopsis The Optical Effects of Tear Film Disruption by : Ronald Cogswell Tutt

Download or read book The Optical Effects of Tear Film Disruption written by Ronald Cogswell Tutt and published by . This book was released on 1999 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most anterior optical surface of the eye has the greatest refractive power. Therefore, the quality of this surface is critical to retinal image quality and visual performance. Most optical texts identify the cornea as the first optical surface but in fact it is the tear layer. A smooth tear layer is considered optically essential and superior to the microscopically irregular corneaZ epithelium. Unlike the other optical surfaces within the eye, the tear film can vary tremendously from second to second as tear' film changes occur between blinks. Although numerous studies have evaluated the change in tear film "quality" during periods of non-blinking little is know about the optical and visual effects resulting from changes in the tear film layer. The classic tear film models suggest that the precorneal tear film is composed of three layers, the superficial lipid layer derived from the meibomian glands, the middle aqueous layer provided by the major and minor lacrimal glands maintains ocular wetting, among other physiological effects, and the inner most layer overlies the corneaZ and conjunctival epithelial cells with mucous like material. Recent studies suggest that the tear film is composed of a mucin "gel" topped by a thin lipid film.

contact lens use under adverse conditions

Author : Working Group on Contact Lens Use Under Adverse Conditions
Publisher : National Academies Press
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4./5 ( download)

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Book Synopsis contact lens use under adverse conditions by : Working Group on Contact Lens Use Under Adverse Conditions

Download or read book contact lens use under adverse conditions written by Working Group on Contact Lens Use Under Adverse Conditions and published by National Academies Press. This book was released on 1990-01-01 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Ocular Surface Disease: Cornea, Conjunctiva and Tear Film

Author : Edward J Holland
Publisher : Elsevier Health Sciences
ISBN 13 : 1455728764
Total Pages : 474 pages
Book Rating : 4.4/5 (557 download)

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Book Synopsis Ocular Surface Disease: Cornea, Conjunctiva and Tear Film by : Edward J Holland

Download or read book Ocular Surface Disease: Cornea, Conjunctiva and Tear Film written by Edward J Holland and published by Elsevier Health Sciences. This book was released on 2013-05-17 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ocular Surface Disease: Cornea, Conjunctiva and Tear Film incorporates current research and the latest management strategies as well as classification systems and treatment paradigms for all forms of ocular surface disease. This is the first comprehensive resource that helps you to meet ocular surface disease challenges effectively using today's best medical and surgical approaches. Get the complete, evidence-based guidance you need to provide optimal care for your patients with ocular surface disease. Implement the latest drug treatments and surgical interventions to provide better outcomes with fewer complications. Hone and expand your surgical skills by watching videos of leading experts performing advanced procedures including ocular surface transplantation techniques; amniotic membrane transplantation; pterygium surgery; lamellar keratoplasty (DALK) in ocular surface disease; and keratoprosthesis surgery. Visualize how to proceed by reviewing detailed, full-color images and consulting new classification systems and treatment paradigms for mild to severe forms of ocular surface disease. Take it with you anywhere! Access the full text, downloadable image library, video clips, and more online at expertconsult.com.

Lacrimal Gland, Tear Film, and Dry Eye Syndromes 2

Author : David A. Sullivan
Publisher : Springer Science & Business Media
ISBN 13 : 1461553598
Total Pages : 1013 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis Lacrimal Gland, Tear Film, and Dry Eye Syndromes 2 by : David A. Sullivan

Download or read book Lacrimal Gland, Tear Film, and Dry Eye Syndromes 2 written by David A. Sullivan and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1013 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past two decades, a significant international research effort has been di rected toward understanding the composition and regulation of the preocular tear film. This effort has been motivated by the recognition that the tear film plays an essential role in maintaining corneal and conjunctival integrity, protecting against microbial challenge, and preserving visual acuity. In addition, research has been stimulated by the knowledge that alteration or deficiency of the tear film, which occurs in countless individuals throughout the world, may lead to desiccation of the ocular surface, ulceration and perfo ration of the cornea, an increased incidence of infectious disease, and, potentially, pro nounced visual disability and blindness. To promote further progress in this field of vision research, the Second International Conference on the Lacrimal Gland, Tear Film and Dry Eye Syndromes: Basic Science and Clinical Relevance was held at the Southampton Princess Resort in Bermuda November 16-19, 1996. This conference was organized and directed by David A. Sullivan, Ph. D. , codirected by Darlene A. Dartt, Ph. D. , and Michele A. Meneray, Ph. D. , and sponsored by the Schepens Eye Research Institute (Boston, MA), an affiliate of Harvard Medical School. The meeting was designed to assess critically the current knowledge and "state of the art" research on the structure and function of lacrimal tissue, tears, and the ocular sur face in both health and disease.

Lacrimal Gland, Tear Film, and Dry Eye Syndromes 3

Author : David A. Sullivan
Publisher : Springer Science & Business Media
ISBN 13 : 1461507170
Total Pages : 1293 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis Lacrimal Gland, Tear Film, and Dry Eye Syndromes 3 by : David A. Sullivan

Download or read book Lacrimal Gland, Tear Film, and Dry Eye Syndromes 3 written by David A. Sullivan and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 1293 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past several decades, a significant international research effort has been directed towards understanding the composition and regulation of the preocular tear film. This effort has been motivated by the recognition that the tear film plays a critical role in maintaining corneal and conjunctival integrity, protecting against microbial challenge and preserving visual acuity. In addition, research has been stimulated by the knowledge that alteration or deficiency of the tear film, which occurs in numerous individuals throughout the world, may lead to desiccation of the ocular surface, ulceration and perforation of the cornea, an increased incidence of infectious disease, and potentionally pronounced visual disability and blindness.

Handbook of Nutrition, Diet, and the Eye

Author : Victor R. Preedy
Publisher : Academic Press
ISBN 13 : 012815246X
Total Pages : 668 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Handbook of Nutrition, Diet, and the Eye by : Victor R. Preedy

Download or read book Handbook of Nutrition, Diet, and the Eye written by Victor R. Preedy and published by Academic Press. This book was released on 2019-06-11 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Nutrition, Diet, and the Eye, Second Edition, thoroughly addresses common features and etiological factors on how dietary and nutritional factors affect the eye. The ocular system is perhaps one of the least studied organs in diet and nutrition, yet the consequences of vision loss are devastating. There are a range of ocular defects that have either their origin in nutritional deficiencies/excess or have been shown to respond favorably to nutritional components. Featuring a new section on animal model studies where both the ocular problem and dietary remedies can be varied, there are also new chapters on dietary supplements. Serves as a foundational collection for neuroscience, neurology and nutrition researchers, illustrating the importance of nutrition and diet in eye health and function Provides a common language for readers to discuss how nutritional factors and related diseases and syndromes affect the eye Features new chapters on infectious diseases of the eye where nutrition is a factor Discusses animal model studies, dietary supplements, natural dietary extracts from around the world, and age-related changes in ocular health

Techniques in Ophthalmic Plastic Surgery

Author : Jeffrey A. Nerad
Publisher : Elsevier Health Sciences
ISBN 13 : 0323393179
Total Pages : 707 pages
Book Rating : 4.3/5 (233 download)

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Book Synopsis Techniques in Ophthalmic Plastic Surgery by : Jeffrey A. Nerad

Download or read book Techniques in Ophthalmic Plastic Surgery written by Jeffrey A. Nerad and published by Elsevier Health Sciences. This book was released on 2020-10-07 with total page 707 pages. Available in PDF, EPUB and Kindle. Book excerpt: The long-anticipated 2nd Edition of Techniques in Ophthalmic Plastic Surgery: A Personal Tutorial presents a unique tutorial-style approach to the information beginners and experts alike need to establish or enhance their oculofacial surgery practice. Superbly illustrated, this book contains over 600 illustrations and clinical photos and follows a step-by-step approach to explaining both the diagnostic and procedural aspects of practice, foundational concepts, and state-of-the art advancements. Whether your background is Ophthalmology, ENT, Plastic Surgery or Dermatology, Dr. Nerad’s "over the shoulder" approach to teaching and clinical pearls learned over years of practice make this a "must read" surgical reference. Offers a unique, conversational approach to complex topics. Dr. Nerad's writing style mimics a "one-on-one" tutorial, helping you learn even the most intimidating oculoplastic surgical techniques. Reflects current practice with significant updates throughout, including updated coverage of both cosmetic and functional procedures to improve "how you see and how you look". Features the latest aesthetic eyelid and facelift procedures and new filler and botulinum toxin techniques in addition to functional procedures that are aimed at restoring vision. Outlines important anatomy and diagnostic considerations alongside step-by-step procedural guidance. Provides clear visual guidance with an outstanding combination of over 600 high-quality artworks and surgical photos. Includes access to over 90 video clips that depict select procedures, showing you Dr. Nerad's techniques and tips in real time. Features checkpoint boxes and major point reviews in each chapter as a quick reminder of critical points in addition to comprehensive suggested reading lists for further study.

Balancing the Tear Film and Dry Eye

Author : Sean Pitale
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (5 download)

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Book Synopsis Balancing the Tear Film and Dry Eye by : Sean Pitale

Download or read book Balancing the Tear Film and Dry Eye written by Sean Pitale and published by . This book was released on 2008 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Dry eye is one of the most common complaints of patients who present in clinic to be seen and treated by professional eye doctors. It has been reported that 20% of patients, over 45 years of age, experience dry eye symptoms. Based on several of the largest studies of dry eye to date, the Women's Health Study and Physicians Health Study, almost 5 million people over the age of 50 have dry eye. The same reports shows that most eye care providers manage these signs based solely on clinical findings. This proves that the more we understand of the causes for dry eye, as well as the signs to look for, the more successful we can be in treating each case that may present within our office. In 2007, the Dry Eye Workshop (DEWS), Definition and Classification Subcommittee, produced a new definition of dry eye. Dry eye is a multifactoral disease of the tears and ocular surface that results in symptoms of discomfort, visual disturbance, and tear film instability with potential damage to the ocular surface. It is accompanied by increased osmolarity of the tear film and inflammation of the ocular surface."--Introd.

Characterization of Tear Breakup and Its Sensory Responses

Author : Deborah Awisi-Gyau
Publisher :
ISBN 13 :
Total Pages : 205 pages
Book Rating : 4.6/5 (624 download)

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Book Synopsis Characterization of Tear Breakup and Its Sensory Responses by : Deborah Awisi-Gyau

Download or read book Characterization of Tear Breakup and Its Sensory Responses written by Deborah Awisi-Gyau and published by . This book was released on 2020 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dry eye disease (DED) affects millions of people in the United States and worldwide. Tear film instability (TFI) and hyperosmolarity have been implicated in the etiology of DED, which is characterized by a loss of homeostasis of the tear film. Theoretically, tear film evaporation is the main factor leading to TFI, resulting in an increased tear film osmolarity and possible "dry spots" when tear film disruption or breakup (TBU) occurs. These adverse conditions in the tear film may damage the ocular surface and stimulate underlying corneal sensory nerves, leading to the symptoms of ocular irritation characteristic of DED. However, the link between the symptoms of DED and TFI remains poorly understood because many highly symptomatic DED patients show little or no ocular surface damage to account for their symptoms. In this thesis, I address this gap in our knowledge by investigating the connection between TFI and the sensory response of the ocular surface epithelium. In the series of experiments described in this thesis, we use a human based method developed in our lab to stimulate TBU and study the formation and progression of TBU. Further, we develop methods to obtain known concentrations of fluorescein and lissamine green, characterize TBU patterns and its impact on corneal sensory thresholds. We hypothesize that TFI can alter the epithelial surface environment by chemical, thermal, and mechanical changes in the tear film, which can stimulate underlying sensory nerves, without clinically observable surface damage. Further, we theorize that repeated TFI and, thus, recurring stimulation of ocular surface sensory neurons leads to altered sensory thresholds and persistent discomfort.

Clinical Diagnosis in Ophthalmology

Author : Jack J. Kanski
Publisher : Mosby
ISBN 13 :
Total Pages : 620 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Clinical Diagnosis in Ophthalmology by : Jack J. Kanski

Download or read book Clinical Diagnosis in Ophthalmology written by Jack J. Kanski and published by Mosby. This book was released on 2006 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Clinical Diagnosis in Ophthalmology is designed to enhance your ability to correctly interpret clinical signs from the basis of diagnosis in ophthalmology."--BOOK JACKET.

Obstetric and Intrapartum Emergencies

Author : Edwin Chandraharan
Publisher : Cambridge University Press
ISBN 13 : 1108847382
Total Pages : 353 pages
Book Rating : 4.1/5 (88 download)

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Book Synopsis Obstetric and Intrapartum Emergencies by : Edwin Chandraharan

Download or read book Obstetric and Intrapartum Emergencies written by Edwin Chandraharan and published by Cambridge University Press. This book was released on 2021-06-03 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: Global and national confidential inquiry reports show that 60 to 80% of maternal and neonatal morbidity and mortality are due to avoidable errors. This comprehensive and illustrated second edition offers a practical guide to the management of obstetric, medical, surgical, anaesthetic and newborn emergencies in addition to organisational and training issues. The book is divided conveniently into nine sections and updated throughout in line with modern research and practice. Several new chapters cover setting up skills and drills training in maternity services to reduce avoidable harm, managing obstetric emergencies during 'home births' and in low-risk midwifery units, and minimizing maternal and fetal morbidity in failed operative vaginal delivery. Each chapter includes a practical algorithm for quick reference, the scientific basis for proposed actions, a case-based practical exercise and useful learning tools such as 'Key Pearls' and 'Key Pitfalls'. An invaluable resource for obstetricians, neonatologists, midwives, medical students, anesthesiologists and the wider perinatal team.

Ocular Fluid Dynamics

Author : Giovanna Guidoboni
Publisher : Springer Nature
ISBN 13 : 3030258866
Total Pages : 606 pages
Book Rating : 4.0/5 (32 download)

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Book Synopsis Ocular Fluid Dynamics by : Giovanna Guidoboni

Download or read book Ocular Fluid Dynamics written by Giovanna Guidoboni and published by Springer Nature. This book was released on 2019-11-25 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Ocular Surface Disorders

Author : Jose M Benitez-del-Castillo
Publisher : JP Medical Ltd
ISBN 13 : 1907816313
Total Pages : 414 pages
Book Rating : 4.9/5 (78 download)

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Book Synopsis Ocular Surface Disorders by : Jose M Benitez-del-Castillo

Download or read book Ocular Surface Disorders written by Jose M Benitez-del-Castillo and published by JP Medical Ltd. This book was released on 2013-11-04 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current knowledge of the epidemiology, clinical expression, pathophysiology and available medical and surgical therapy for ocular surface diseases, providing an invaluable text for ocular surface specialists, general ophthalmologists, optometrists and residents.

Ophthalmology for the Primary Care Physician

Author : Jay H. Krachmer
Publisher :
ISBN 13 :
Total Pages : 340 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Ophthalmology for the Primary Care Physician by : Jay H. Krachmer

Download or read book Ophthalmology for the Primary Care Physician written by Jay H. Krachmer and published by . This book was released on 1997 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by ophthalmologists and carefully reviewed by primary care consultants, this new reference provides the primary care physician with exactly the information needed to either diagnose an eye disorder or identify the signs and symptoms to refer the treatment to an ophthalmologist. The text begins with chapters on performing the general examination of the eye and differential diagnosis. Then each region of the eye is covered, first with a discussion of anatomy in order to define any abnormalities, followed by signs and symptoms of various disorders of that region. A treatment plan is then offered, or a recommendation to refer to an ophthalmologist. Hundreds of high-quality, color illustrations are used throughout to aid the reader in arriving at an accurate diagnosis. For ease of access, an easy-to-follow, bulleted format has been used throughout, designed to assist with quick recognition and diagnosis of ophthalmic disorders. Full-color illustrations provide an excellent diagnostic tool. Topics are organized by eye region and/or symptom recognition, further aiding the non-specialist in recognition, diagnosis, and treatment. Chapter authors have been paired with primary care consultants to ensure relevance to the needs of the primary care practitioner.

Kanski's Clinical Ophthalmology E-Book

Author : Jack J. Kanski
Publisher : Elsevier Health Sciences
ISBN 13 : 0702055743
Total Pages : 931 pages
Book Rating : 4.7/5 (2 download)

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Book Synopsis Kanski's Clinical Ophthalmology E-Book by : Jack J. Kanski

Download or read book Kanski's Clinical Ophthalmology E-Book written by Jack J. Kanski and published by Elsevier Health Sciences. This book was released on 2015-03-24 with total page 931 pages. Available in PDF, EPUB and Kindle. Book excerpt: Kanski’s Clinical Ophthalmology: A Systematic Approach is the classic specialty text providing the perfect ophthalmology foundation for trainees through to experienced practitioners. The famous visually dynamic and succinct format enables easy comprehension and focused guidance in the diagnosis and management of ophthalmic disorders. Build the ultimate foundation in ophthalmology with this market-leading resource. Benefit from guidance on examination, imaging, and the recognition of systemic conditions associated with ocular disease. Completely revised by award-winning ophthalmic educator Brad Bowling, the eighth edition reflects the latest advances, making this an indispensable resource to enhance learning, aid exam preparation and guide clinical practice. Designed for rapid reference and efficient recall, the concise but comprehensive chapters use crisp targeted text, bulleted lists, tables, and visual aids to highlight salient points across all ophthalmology subspecialties. Features detailed updates on key evolving topics such as the spectrum of macular disease, with many new disorders added to this edition across a range of subspecialties. Increased emphasis on practical investigation and management. Includes 2,600 illustrations, images and artworks, with over 900 brand new for this edition, including ultra wide-field imaging, fundus autofluorescence, and high-resolution OCT. Consult this title on your favourite e-reader.

Contact Lens Complications

Author : Nathan Efron
Publisher :
ISBN 13 :
Total Pages : 292 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Contact Lens Complications by : Nathan Efron

Download or read book Contact Lens Complications written by Nathan Efron and published by . This book was released on 2004 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: The new 2nd edition of this practical manual has been completely updated and revised to reflect the most current knowledge, research findings, technological developments, and updates in contact lens materials. With its broad coverage and systematic approach, it provides an intuitive approach to understanding, diagnosing, and treating contact lens complications. This lavishly illustrated text is recognized as a definitive resource on contact lens for practitioners and students.

Lacrimal Gland, Tear Film, and Dry Eye Syndromes

Author : David A. Sullivan
Publisher : Springer Science & Business Media
ISBN 13 : 1461524172
Total Pages : 720 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis Lacrimal Gland, Tear Film, and Dry Eye Syndromes by : David A. Sullivan

Download or read book Lacrimal Gland, Tear Film, and Dry Eye Syndromes written by David A. Sullivan and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past decade a significant international research effort has been directed towards understanding the composition and regulation of the preocular tear film. This effort has been motivated by the recognition that the tear film plays an essential role in maintaining corneal and conjunctival integrity, protecting against microbial challenge and preserving visual acuity. In addition, research has been stimulated by the knowledge that alteration or deficiency of the tear film, which occurs in countless individuals throughout the world, may lead to desiccation of the ocular surface, ulceration and perforation of the cornea, an increased incidence of infectious disease, and potentially, pronounced visual disability and blindness. 7 To promote further progress in this field of vision research, the International Conference on the Lacrimal Gland, Tear Film and Dry Eye Syndromes: Basic Science and Clinical Relevance was held in the Southampton Princess Resort in Bermuda from November 14 to 17, 1992. This meeting was designed to assess critically the current knowledge and 'state of the art' research on the structure and function of lacrimal tissue and tears in both health and disease. The goal of this conference was to provide an international exchange of information that would be of value to basic scientists involved in eye research, to physicians in the ophthalmological community, and to pharmaceutical companies with an interest in the treatment of lacrimal gland, tear film or ocular surface disorders (e. g. Sjogren's syndrome).