Download or read book Management of Early Progressive Corneal Ectasia written by Cosimo Mazzotta and published by Springer. This book was released on 2017-11-08 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a rapid overview of crosslinking protocols and the therapeutic guidelines to optimize the application according to patients age and ectasia staging. This book is unique in the field of crosslinking therapy, as it gives the readers a complete guide for their daily practice to understand the modern accelerated crosslinking protocols, indications and customized treatment strategies. Ophthalmic specialists, opticians, optometrists and doctors working in ophthalmic settings, will find this book to be a ‘go-to’ guide for furthering clinical knowledge of this specialized treatment for early progressive corneal ectasia.

Download or read book Keratoconus written by Ashraf Armia and published by Springer Nature. This book was released on 2021-11-20 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a practical guide to the most recent advances in the diagnostic management of corneal ectasia. Clear, concise chapters address new standardized nomograms of treatment of early progressive ectasia, new epithelium on future crosslinking with and without oxygen supplement, customized protocols, laser assisted corneal regularization protocols and the new femtolaser assisted lamellar corneal transplant. Clinicians and surgeons seeking a go-to guide on the topic of corneal ectasia will find this book to be an essential resource for the latest developments and predicted future trends in the field.

Download or read book Progressive Keratoconus Insights into Etiopathogenesis Diagnosis and Treatment written by and published by Frontiers Media SA. This book was released on 2023-11-29 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the early stages of keratoconus, visual acuity may be normal and slit-lamp examination is not able to identify the disease phenotype. Early diagnosis of keratoconus is of major importance for effective treatment. That is why corneal topography and tomography has become the gold standard examination for diagnosis of corneal ectasia. Corneal topography is a non-contact imaging tool that gives information about the anterior surface of the cornea. Corneal tomography evaluates both anterior and posterior corneal surfaces and is considered mandatory for preoperatory evaluation before refractive surgery. Until recently, Kmax was the main indicator for the progression of keratoconus, but recent studies showed that posterior elevation represents the first signal of an ectatic corneal disease. Cross-linking is considered the gold standard in the treatment of keratoconus and newer techniques allow this procedure to be selective on the areas of corneal thinning.

Download or read book Corneal Biomechanics written by C.J. Roberts and published by Kugler Publications. This book was released on 2017-05-15 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: While lecturing in recent months at a number of prominent institutions, I asked some of the residents and fellows whether and how they might benefit from a book on corneal biomechanics. The typical response was the look of a deer caught in the headlights as they tried to intuit the “appropriate” answer, but had little understanding or insight as to why this would be an important and useful knowledge base for them now, or in the future. I then posed the question differently. “Would a book that explained corneal biomechanical principles and testing devices and their application in detecting eyes at risk for developing keratoconus and post-LASIK ectasia, understanding the biomechanical impact of specific types of keratorefractive surgery and riboflavin UV-A corneal collagen cross-linking, and the impact of corneal biomechanics on the fidelity of intraocular pressure measurement and risk for glaucoma progression be of interest?” Framed in this context, the answer I got was a resounding, “Yes!” Therein lies a fundamental disconnect that highlights both the opportunity and need to educate all ophthalmologists about this nascent field. This comprehensive book is strengthened by the breadth of contributions from leading experts around the world and provides an important resource for ophthalmologists at all levels of training and experience. It gives a panoramic snapshot of our understanding of corneal biomechanics today, bridging the gap between theoretical principles, testing devices that are commercially available and in development as well as current and potential future clinical applications. While there has been a long-held appreciation that all types of keratorefractive surgery have an impact and interdependence on corneal biomechanics and wound healing, the initial finite element analyses that were applied to understand radial keratotomy were limited by incorrect assumptions that the cornea was a linear, elastic, homogenous, isotropic material.1 With the advent of excimer laser vision correction, critical observations indicated that Munnerlyn’s theoretic ablation profiles did not account for either lower or higher order (e.g. spherical aberration) refractive outcomes,2 suggesting that there were important components missing from the equation—e.g., corneal biomechanics and wound healing. In a seminal editorial, Roberts3 pointed out that the cornea is not a piece of plastic, but rather a material with viscoelastic qualities. Since that time, much has been learned about spatial and depth- related patterns of collagen orientation and interweaving, as well as the biomechanical response to different keratorefractive surgeries that sever tension-bearing lamellae, as the cornea responds to and redistributes stress induced by IOP, hydration, eye rubbing, blinking and extraocular muscle forces.3-6 The first reports of post-LASIK ectasia7 highlighted the need to identify a biomechanical signature of early keratoconus as well as corneas at high risk of developing ectasia irrespective of their current topography or tomography. The introduction of two instruments into clinical use—the Ocular Response Analyzer (ORA) and the Corneal Visualization Scheimpflug Technology (Corvis ST)—that allow measurement of various biomechanical metrics further catapulted the field. The availability of these instruments in routine clinical settings allowed the systematic study of the effect of age, collagen disorders, collagen cross-linking, corneal rings, flaps of various depths, contour, sidecut angulation, pockets, and flockets, just to name of few. Future application of biomechanics to the sclera may improve our understanding of the development and prevention of myopia, as well as scleral surgeries and treatments under development for presbyopia. It was appreciated by Goldmann and Schmidt that corneal thickness and curvature would influence the measurement of applanation tonometry. The recent ability to measure some corneal biomechanical metrics have led to IOP measurement that may be more immune both to their influence and the impact of central corneal thickness (CCT). Certain chapters in this book explain how a thin cornea could be stiffer than a thick one and that stiffness is also impacted by IOP, thereby precluding simplistic attempts to adjust IOP measurements using nomograms based upon CCT alone. Also highlighted is how corneal hysteresis, the ability of the cornea to absorb and dissipate energy during the bidirectional applanation response to a linear Gaussian air puff, appears to be an independent risk factor for glaucoma progression and rate of progression.9,10 This comprehensive book starts out with a section devoted to outlining basic biomechanical principles and theories, teaching us the language of what Dupps11 has referred to as “mechanospeak”, thus providing a context and common vocabulary to better comprehend the following chapters. By first defining basic concepts such as stress-strain relationships and creep, this theoretical basis is later applied to explain the pathogenesis of corneal diseases, e.g., explaining how a focal abnormality in corneal biomechanical properties precipitates a cycle of decompensation and localized thinning and steepening, clinically expressed as ectasia progression. These early chapters further detail biomechanical differences between in-vivo and ex-vivo testing, between human and animal corneas and sclera, and between methods of testing. The second section provides a thorough description of two FDA-approved devices to measure corneal biomechanics in the clinic (i.e., the ORA and the Corvis ST), as well as an overview of potential future technologies, including OCT with air puff stimulus, ocular pulse elastography, and Brilloiun microscopy. The third and final section of the book is a thorough treatise on how to interpret the metrics derived from the waveform provided by available clinical devices; their adjunct use in ectasia risk screening; the comparative biomechanical impact of various keratorefractive surgeries and corneal procedures such as PRK, LASIK, SMILE, and corneal collagen cross-linking; the impact of corneal biomechanics on IOP measurement; and potential biomechanical markers of enhanced susceptibility to glaucoma progression. This compendium of our current knowledge of corneal biomechanics, its measurement and application, provides a strong foundation to more fully understand advances in keratorefractive and corneal surgery, diseases, and treatments, all of which are interdependent on and influence inherent corneal biomechanical properties and behavior. Both the robust aspects and limitations of our current understanding are presented, including the challenge of creating accurate and predictive finite element models that incorporate the impact of IOP, corneal thickness, geometry, and scleral properties on corneal biomechanics. This book provides a key allowing clinical ophthalmologists and researchers to grasp the basics and nuances of this exciting field and to shape it as it evolves in the future.

Download or read book Corneal Topography written by Melanie Corbett and published by Springer. This book was released on 2019-06-11 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: The new edition of this leading text atlas on corneal topography has been updated to include the latest advances in technology, such as Pentacam and Orbscan. The principles and theory underlying each technology are first clearly explained, and clinical applications are then examined. The authors describe how to use the different technologies and devices, explain the clinical readout with illustrations of normal corneal topography, discuss applications and findings in common disease states, and present the appearances after various corneal surgical procedures. The pros and cons of each system are highlighted. This up-to-date, superbly illustrated book is the most comprehensive guide to corneal topography currently available. It is anticipated that this second edition will become the seminal corneal topography textbook for all with an interest in corneal disease and its management, and refractive surgery.

Download or read book Ocular Imaging written by George Asimellis and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the International Conference on ISMAC in Computational Vision and Bio Engineering 2018 ISMAC CVB written by Durai Pandian and published by Springer. This book was released on 2019-01-01 with total page 1869 pages. Available in PDF, EPUB and Kindle. Book excerpt: These are the proceedings of the International Conference on ISMAC-CVB, held in Palladam, India, in May 2018. The book focuses on research to design new analysis paradigms and computational solutions for quantification of information provided by object recognition, scene understanding of computer vision and different algorithms like convolutional neural networks to allow computers to recognize and detect objects in images with unprecedented accuracy and to even understand the relationships between them. The proceedings treat the convergence of ISMAC in Computational Vision and Bioengineering technology and includes ideas and techniques like 3D sensing, human visual perception, scene understanding, human motion detection and analysis, visualization and graphical data presentation and a very wide range of sensor modalities in terms of surveillance, wearable applications, home automation etc. ISMAC-CVB is a forum for leading academic scientists, researchers and research scholars to exchange and share their experiences and research results about all aspects of computational vision and bioengineering.

Download or read book Contact Lens Practice E Book written by Nathan Efron and published by Elsevier Health Sciences. This book was released on 2016-11-27 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thoroughly revised and updated third edition of Contact Lens Practice, award-winning author, researcher and lecturer, Professor Nathan Efron, provides a comprehensive, evidence-based overview of the scientific foundation and clinical applications of contact lens fitting. The text has been refreshed by the inclusion of ten new authors – a mixture of scientists and clinicians, all of whom are at the cutting edge of their specialty. The chapters are highly illustrated in full colour and subject matter is presented in a clear and logical format to allow the reader to quickly hone in the desired information. Ideal for an optometrist, ophthalmologist, orthoptist, optician, student, or work in the industry, this book will serve as an essential companion and guide to current thinking and practice in the contact lens field. Highlights of this edition include a new chapter on myopia control contact lenses, as well are completely rewritten chapters, by new authors, on keratoconus, orthokeratology, soft and rigid lens measurement and history taking.

Download or read book Keratoconus written by Mehrdad Mohammadpour and published by CRC Press. This book was released on 2024-10-24 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an updated and comprehensive treatise on optical, medical, and surgical management of keratoconus with an exclusive panoramic view of all existing modalities for confronting this serious disabling morbidity affecting people in their youth. Early diagnosis and proper treatment can salvage vision and help patients to get back to their routines and enhance their quality of life. The contents include optical and glass prescription and contact lens fitting; CXL alone; and combined surgeries, phakic IOLs, and corneal transplantation. The illustrated and organized 360-degrees approach makes this a must-have manual for ophthalmology trainees, fellows, and professionals. Key Features: Focuses on optical management for keratoconus, with the latest updates on surgical management Covers a very interesting and relevant topic for ophthalmologists and cornea specialists, using a practical case-based format Uses evidence-based algorithms from updated published data and insights from experienced authors

Download or read book Contemporary Scleral Lenses Theory and Application written by Melissa Barnett and published by Bentham Science Publishers. This book was released on 2017-11-03 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contemporary Scleral Lenses: Theory and Application, provides comprehensive information about scleral lenses. Chapters of this volume have been contributed by renowned scleral lens experts and cover a variety of interesting topics. These topics include the history and evolution of scleral lenses, basic scleral lens structure, optics and customizable features of scleral lenses, analysis of ocular surface shape, ocular surface topography and advances in optometry technology. These topics give readers an explanation of how to utilize diagnostic equipment in optometry practice and enables practitioners to employ a scientific and objective approach to scleral lens fitting. Key features of this volume include: - A straightforward approach to ophthalmic examination flow, evaluation and documentation - A review of Scleral lens care and handling - Descriptions of a variety of complex medical and ocular indications for scleral lenses - Strategic tips to promote your own scleral lens practice - A unique perspective of esteemed corneal specialists regarding the collaborative care of the patient This textbook is a suitable reference for ophthalmology students and practitioners. This text will assist practitioners in enhancing their scleral lens practice by providing them useful information for improving patient vision, ocular surface rehabilitation and quality of life.

Download or read book Osteogenesis Imperfecta written by Javaid Kassim and published by Academic Press. This book was released on 2013-08-06 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: Osteogenesis Imperfecta is the first translational reference professionals can turn to for a source of comprehensive information on this disorder. Although several reviews of the field have been published in various journals, there is no other single source for a compendium of current information. Separate chapters discuss each of the several clinical features of OI. Ethical issues related to OI are discussed, as is the importance of nutrition in managing the OI child and the OI adult. The role of physical medicine and rehabilitation for OI patients is also presented, along with the current status of OI medical treatment and the prospects for genetic engineering in the future. The text also provides the orthopedic surgeon with an advanced discussion of surgical techniques applicable to OI. Incorporates chapters and information on the ethical issues related to osteogenesis imperfecta (OI) as will the importance of nutrition in managing the OI child and the OI adult Offers new insights into the underlying mechanisms of collagen biochemistry as related to OI as well as a presentation of intracellular collagen processing and the expanded role of protein chaperones in OI Discusses the role of physical medicine and rehabilitation for OI patients and the current status of OI medical treatment as well as prospects for genetic engineering in the future Provides a unique overview for the orthopedic surgeon with an advanced discussion of surgical techniques applicable to OI

Download or read book Irregular Astigmatism written by Tracy Schroeder Swartz and published by SLACK Incorporated. This book was released on 2008 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the advent of keratorefractive surgery and its rising popularity, irregular astigmatism has become an increasingly important issue for ophthalmologists and optometrists. Despite the success of LASIK and PRK, there are more and more patients experiencing visual quality problems due to the non-physiological modification of the corneal structure. Among these complications, irregular astigmatism is perhaps the most difficult to treat. Every physician who performs keratorefractive surgery understands that in reducing a patient.s refractive error, there is a possibility of creating irreversible effects on visual quality. This text is intended to help prevent and reduce the iatrogenic creation of irregular astigmatism, as well as provide effective treatment when postoperative complications do arise. With the maturation of keratorefractive technology in recent years, effective treatment for iatrogenic irregular astigmatism is quickly developing. It provides everything refractive surgeons, ophthalmologists, and optometrists need to know about this important topic.

Download or read book Management of Complications in Refractive Surgery written by Jorge L. Alio and published by Springer. This book was released on 2018-01-02 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: This illustrated guide is written by international opinion leaders with extensive experience in the practice of refractive surgery. It is the first book devoted to refractive complications (with practical hints and case reports on outcomes) to provide ophthalmic surgeons with the most adequate solutions for the most frequent problems. All complications are described and lavishly illustrated. The book provides ophthalmic surgeons with the most adequate solutions for the most frequent problems they face in their daily practice.

Download or read book Astigmatism written by Michael Goggin and published by BoD – Books on Demand. This book was released on 2012-02-29 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the development, optics and physiology of astigmatism and places this knowledge in the context of modern management of this aspect of refractive error. It is written by, and aimed at, the astigmatism practitioner to assist in understanding astigmatism and its amelioration by optical and surgical techniques. It also addresses the integration of astigmatism management into the surgical approach to cataract and corneal disease including corneal transplantation.

Download or read book Recent Advances in Ophthalmology 14 written by HV Nema and published by Jaypee Brothers Medical Publishers. This book was released on 2019-06-30 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the latest volume in the Recent Advances in Ophthalmology series providing ophthalmic trainees and ophthalmologists with the latest surgical and technological developments in the field. Divided into 21 chapters, each section is dedicated to a specific topic, explaining symptoms, investigation techniques, imaging, differential diagnosis and treatment methods. The pros and cons of various surgical procedures are covered in depth. New to this volume is discussion on advances in lamellar keratoplasty, deep anterior lamellar keratoplasty, Descemet’s membrane endothelial keratoplasty (DMEK), and a new technique – keratopigmentation. The text features nearly 400 clinical photographs, diagrams, flowcharts and tables to assist learning. Key points Latest volume in Recent Advances in Ophthalmology series Covers latest surgical and technological developments in the field Features new topics and nearly 400 images, flowcharts and tables Previous volume (9789386322784) published in 2017

Download or read book Femtosecond Laser Assisted Keratoplasty written by Jorge L Alio and published by JP Medical Ltd. This book was released on 2013-07-30 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keratoplasty is the transplantation of all or part of the cornea to repair scarred or damaged tissue. A femtosecond laser is a laser which emits ultrashort pulses, used for minimally invasive corneal surgery. This book is a concise guide to the technique of femtosecond laser-assisted keratoplasty. Beginning with an introduction to the technology, the following chapters discuss its use for different disorders. This practical text is based on the surgical experience of its internationally recognised authors from Spain, Germany, France and the USA. It includes more than 230 full colour clinical photographs and illustrations to enhance learning. Key points Concise guide to the corneal transplantation procedure of femtosecond laser-assisted keratoplasty Covers key technologies and uses for different disorders Internationally recognised author and editor team Includes more than 230 clinical photographs and illustrations

Download or read book Roy and Fraunfelder s Current Ocular Therapy written by Frederick Hampton Roy and published by Elsevier Health Sciences. This book was released on 2008-01-01 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is designed to be concise with a consistent format so that the clinician can focus on a specific area. This edition has had major modifications and embraces evidence-based medicine. The format includes the CPT codes for billing purposes, short description of the condition, etiology/incidence, course/prognosis, laboratory findings, differential diagnosis; prophylaxis, treatment (local and systemic, surgical or other), miscellaneous (names and addresses of support groups) and key references. Incorporates evidence-based medicine so you feel confident that you're formulating the best treatment plans for your patients.Color photos allow you to read about and actually see a picture of select disease entities.Clear, concise format can be photocopied and distributed to patients in some cases, reducing your time spent explaining problems to patients and caregivers.