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Author : Mazen M Sinjab
Publisher : JP Medical Ltd
Page : 260 pages
File Size : 46,9 Mb
Release : 2021-05-31
Category : Medical
ISBN : 9781787791619
This fourth edition provides the latest developments in corneal tomography using the Pentacam system.
Author : Mazen M. Sinjab
Publisher : JAYPEE BROTHERS MEDICAL PUBLISHERS PVT. LTD.
Page : 233 pages
File Size : 40,7 Mb
Release : 2012
Category : Medical
ISBN : 9789350905609
The second edition of this internationally book concentrates on corneal topography and tomography with the very advanced machine ""The Pentacam HR."" It is a pioneer book in this field. Basics of both corneal topography and tomography are well discussed in details according to Pentacam system. New chapter on Corneal Topography in Cataract Surgery is added in this edition with modifications in some chapters such as Curvature Maps/Corneal Power Maps, Keratoectasia, Topographical Criteria and Patterns of Keratoconus, The Hotspot Syndrome and Topographical Patterns of Irregular Astigmatism. Excell.
Author : Mazen M Sinjab
Publisher : Jaypee Brothers Medical Publishers
Page : 262 pages
File Size : 54,7 Mb
Release : 2018-09-22
Category : Fiction
ISBN : 9789386261106
Corneal tomography is a non-invasive medical imaging technique for mapping the surface curvature of the cornea, the outer structure of the eye. This procedure may be carried out with a Pentacam, which uses a rotating camera to create a 3D image of the anterior of the eye. This third edition has been fully updated to provide the latest developments in corneal tomography using the Pentacam system. Beginning with an introduction, the following sections cover corneal maps and profiles, corneal refraction, Wavefront analysis, systematic interpretation of corneal tomography, and corneal tomography in ectatic corneal diseases. The final section explains the Holladay Report, and corneal tomography and aberrometry in cataract surgery. Presented in a step by step format the new edition of this popular manual also includes discussion on false positives and false negatives. Authored by recognised expert Mazen M Sinjab, the book features nearly 350 high quality, colour images and illustrations. Key points Fully revised, third edition presenting latest advances in corneal tomography using the Pentacam system Presented in step by step format with nearly 350 images and illustrations Authored by recognised expert Mazen M Sinjab Previous edition (9789350255759) published in 2012
Author : Mazen M Sinjab
Publisher : JP Medical Ltd
Page : 235 pages
File Size : 43,6 Mb
Release : 2020-12-16
Category : Medical
ISBN : 9781787791299
The third edition of this bestselling book has been fully revised to present ophthalmologists with the latest advances in the interpretation of corneal topography using the Pentacam.
Author : Michael W. Belin,Stephen S Khachikian,Renato Ambrosio Jr
Publisher : JP Medical Ltd
Page : 266 pages
File Size : 49,5 Mb
Release : 2012-05-18
Category : Medical
ISBN : 9789962678533
This book is a concise guide to elevation based tomographic imaging for ophthalmologists and cataract surgeons. Beginning with an introduction and overview of its evolution, the following chapters explain how to understand and interpret the data presented. Various procedures for different conditions are discussed, including the use of Pentacam for cataract disorders. With contributions from internationally renowned authors, this new edition includes more than 200 colour images and illustrations. The final section is a glossary of important terminology.
Author : C.J. Roberts,J. Liu
Publisher : Kugler Publications
Page : 328 pages
File Size : 48,8 Mb
Release : 2017-05-15
Category : Medical
ISBN : 9789062998760
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.
Author : Mazen M Sinjab
Publisher : JP Medical Ltd
Page : 238 pages
File Size : 55,8 Mb
Release : 2012-05-18
Category : Medical
ISBN : 9789350255759
Corneal topography is a non-invasive medical imaging technique for mapping the surface curvature of the cornea, the outer structure of the eye. This procedure may be carried out with a Pentacam, which uses a rotating camera to create a 3D image of the anterior of the eye. This second edition has been fully updated to provide the latest developments in corneal topography and tomography using the Pentacam machine. Beginning with an introduction, the following sections describe the fundamentals of corneal topography and use of the Pentacam with different ophthalmic disorders. With nearly 250 high quality, colour images and illustrations, this concise guide is especially useful to graduate and postgraduate students in learning how to read and interpret corneal topography.
Author : Mazen M Sinjab
Publisher : Jaypee Brothers Medical Publishers Pvt. Limited
Page : 0 pages
File Size : 55,6 Mb
Release : 2015-01-31
Category : Medical
ISBN : 9351523977
Corneal topography is a non-invasive medical imaging technique for mapping the surface curvature of the cornea, the outer structure of the eye. This procedure may be carried out with a Pentacam, which uses a rotating camera to create a 3D image of the anterior of the eye. This second edition has been fully revised to present ophthalmologists with the latest advances in the interpretation of corneal topography using the Pentacam. Beginning with discussion on various devices that may be used for corneal topography, the following sections explain accurate interpretation of the images for diagnosis and treatment. The new edition includes two new chapters on the use of Pentacam topography for refractive surgery patients. The final section presents clinical case studies to assist understanding. Key points New edition presenting latest advances in interpretation of Pentacam topography Includes two new chapters on Pentacam for refractive surgery patients Features case studies to enhance understanding Previous edition published in 2010
Author : Melanie Corbett,Nicholas Maycock,Emanuel Rosen,David O'Brart
Publisher : Springer
Page : 287 pages
File Size : 51,8 Mb
Release : 2019-06-11
Category : Medical
ISBN : 9783030106966
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.
Author : Ming Wang,Lance Kugler
Publisher : CRC Press
Page : 452 pages
File Size : 55,6 Mb
Release : 2024-06-01
Category : Medical
ISBN : 9781040142134
Corneal topography has become essentially a pattern recognition trade, best learned by viewing multiple images of representative patterns. In spite of this, currently available topography books focus only on the technology behind topography, or a particular application of topography, as opposed to presenting a comprehensive collection of topographic patterns that provide quick, consistent pattern recognition and identification. Drs. Wang and Kugler, along with Drs. Morgan and Boerman, look to fill this void with Atlas and Clinical Reference Guide for Corneal Topography. Atlas and Clinical Reference Guide for Corneal Topography is the first corneal topography book that lends itself to efficient image search and reference for busy clinicians at chair side. Organized into both map-based and disease-based sections, the book allows for quick reference in busy clinical situations. Images come from the commonly used topographers, the Zeiss Atlas and the Oculus Pentacam, but the principles of pattern recognition can be applied to any topographer. Due to the text’s large collection of topographic images and corresponding corneal conditions, Atlas and Clinical Reference Guide for Corneal Topography can be used side by side with the topographer. Designed as both a learning tool for students and a reference for clinicians to use when faced with a challenging topography interpretation, Atlas and Clinical Reference Guide for Corneal Topography will be appreciated by a wide spectrum of eye care professionals. General ophthalmologists, cataract and refractive surgeons, corneal specialists, optometrists, and ophthalmology residents and students will benefit from this invaluable atlas for corneal topography.
Author : Mazen M. Sinjab,Arthur B. Cummings
Publisher : Springer
Page : 296 pages
File Size : 46,5 Mb
Release : 2016-11-09
Category : Medical
ISBN : 9783319397757
This book provides comprehensive coverage of corneal collagen cross-linking (CXL), a major management modality for keratoconus and ectatic corneal disorders. All aspects are covered, including refractive and non-refractive surgery indications, models of application, safety, efficacy, performance, outcome measures, evidence of CXL, complications, contraindications, use in children, and controversies. The discussion reflects the considerable progress that has been made in understanding of the modality since its development in the late 1990s. Detailed attention is paid to new concepts, changing surgical techniques and indications, the latest evidence-based science and research, and the future of CXL. Guidance is also provided on the use of CXL in combination with other modalities, such as LASIK, PRK, intracorneal ring implantation and others. The text is accompanied by numerous high-quality color illustrations. Corneal Collagen Cross Linking will provide the reader with a sound grasp of the technique and its use and will hopefully also serve as a stimulus to further research and advances.
Author : Mazen M Sinjab
Publisher : JP Medical Ltd
Page : 384 pages
File Size : 41,5 Mb
Release : 2014-01-30
Category : Medical
ISBN : 9789350909874
Refractive surgery is eye surgery to improve the refractive state of the eye and reduce or eliminate the need for glasses or contact lenses. The most common type of refractive surgery uses lasers to reshape the curvature of the cornea. This book is a comprehensive guide to refractive surgery. Presented in five steps, it begins with discussion on corneal imaging and its clinical application. The second step examines key refractive procedures and step three offers advice on rules and guidelines for refractive surgery. Step four is a guide to actually starting the procedure and avoidable complications. The final section describes a clinical case study. Enhanced by nearly 500 high quality images, diagrams and tables, each chapter includes key points and clinical tips to assist understanding. Key points Comprehensive guide to refractive surgery Presented in step by step format Key points and clinical tips in each chapter Includes nearly 500 images, diagrams and tables
Author : National Research Council,Division of Behavioral and Social Sciences and Education,Commission on Behavioral and Social Sciences and Education,Committee on Vision,Working Group on Contact Lens Use Under Adverse Conditions
Publisher : National Academies Press
Page : 178 pages
File Size : 55,7 Mb
Release : 1991-02-01
Category : Medical
ISBN : 9780309044387
This book summarizes current understanding of the scientific, clinical, and technical issues surrounding the use of contact lenses. It discusses the special occupational conditions experienced by military personnel, particularly in extreme environments, that give rise to the question of whether or not to use contact lenses. Experts in optometry, ophthalmology, visual psychophysics, and engineering describe recent developments in design and use; and representatives of the military services provide examples of actual situations in aerospace settings. Considerations in Contact Lens Use Under Adverse Conditions will be of particular interest to those involved in the design of contact lenses and those responsible for occupational safety and health matters in the private sector.
Author : Ming Wang
Publisher : Slack Incorporated
Page : 128 pages
File Size : 55,7 Mb
Release : 2006-01-01
Category : Medical
ISBN : 1556427522
Understanding corneal topography is essential for an anterior segment surgeon, general ophthalmologist and optometrist. Corneal Topography PDF CD-ROM delivers the information needed to develop an understanding of the state-of-the-art corneal topographic technology and its relationship to keratorefractive surgery. As the popularity of wavefront sensing continues to rise, it is important to keep pace with the latest developments in corneal topography, which remains an indispensable part of anterior segment ophthalmology practice. The improvement in corneal topographic and wavefront-sensing technologies coupled with the advent of an innovative custom treatment approach using these two technologies has ushered in a new era of cornea and refractive surgery with unprecendented superior clinical outcomes. In response to the need for an updated corneal topography reference, Dr. Ming Wang organized a team of over 30 of the field's leading professionals to produce this informative and comprehensive text. Inside Corneal Topography PDF CD-ROM, you will find a comprehensive review of the science of corneal topography and principles and application of all major topographic imaging systems currently available. Emphasis is placed on clinical use of these topographic systems in addition to pre- and postoperative evaluation and management of refractive surgery patients. New technologies such as topography-guided and combined wavefront and topography-guided custom treatments are presented. The clinical case presentations reinforce the key scientific concepts discussed early in the text as well as serve as a rapid and easy-access reference for the most common examples of topographic problems found in anterior segment and refractive surgery patients. Color figures and topographical maps are extensively used to illustrate the types and features of corneal topography and clinical case presentation. In today's wavefront era, it is important to understand the role of corneal topography in the anterior segment and refractive surgery practice. Corneal Topography PDF CD-ROM's focus and scope makes it a must-have reference for all ophthalmologists and optometrists. Topics Include: Anatomy and physiology of the cornea Classification of topographic technologies Scales and conventions used in corneal topography Principles and applications of major types of corneal topographies Clinical case presentation of commonly encountered problems in anterior segment and refractive surgery Posterior corneal changes in refractive surgery New technology in corneal topography - driven treatment New technologies in combined custom treatment approach using corneal topography and wavefront sensing. Features on the PDF CD-ROM: Includes the full-text! Includes all images! User-friendly PDF Format! System Requirements For Windows Users Only: Intel Pentium processor Microsoft Windows 95 OSR 2.0, Windows 98 SE, Windows Millennium Edition, Windows NT 4.0 with Service Pack 5, Windows 2000, or Windows XP 64MB of RAM 24MB of available hard-disk space Adobe Acrobat Reader 5 or above (included)
Author : Mazen M. Sinjab
Publisher : Jaypee Brothers Medical Pub
Page : 209 pages
File Size : 54,6 Mb
Release : 2009-10-30
Category : Medical
ISBN : 8184488041
