Two Alternate Refraction Methods That Use A Scheiner S Disc And Stenopaic Slit
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Two Alternate Refraction Methods That Use A Scheiner S Disc And Stenopaic Slit
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Author : Chad Hollifield
language : en
Publisher:
Release Date : 2016
Two Alternate Refraction Methods That Use A Scheiner S Disc And Stenopaic Slit written by Chad Hollifield and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Eye categories.
Purpose. Subjective refraction procedures using a Jackson Cross Cylinder and blur interpretation are well established, but other less known and rarely used methods exist. Our purpose was to assess two alternate methods for possible advantages relative to traditional subjective refraction. Methods. Method1 used a simple stenopaic slit to find the major meridians and then a Scheiner’s disc to measure their refractive powers. Method2 used a modified Scheiner’s disc overlaid with Fresnel prisms to measure power in each meridian. Both methods measured separate samples of 20 eyes, and their results were compared to standard subjective refractions. We evaluated agreement with standard refraction as well as visual acuity and utility of each method. Results. The mean power difference (power vector magnitude) between Method1 and subjective refraction was 0.39 D. Mean axis difference was 2.3°. Average visual acuity was not significantly different. The corresponding results for Method2 were 1.65 D, 9.2° and visual acuity was 0.27 logMAR (approximately 3 lines) worse. Conclusions. Results for Method1 indicated close agreement with standard subjective refraction, but was harder for some subjects to understand. It could be a viable alternative when standard refraction is unreliable. Method2 showed poor agreement and significantly worse visual acuity. In its current stage of development, it is not a viable alternative to standard subjective refraction.
Borish S Clinical Refraction E Book
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Author : William J. Benjamin
language : en
Publisher: Elsevier Health Sciences
Release Date : 2006-10-13
Borish S Clinical Refraction E Book written by William J. Benjamin and has been published by Elsevier Health Sciences this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-10-13 with Medical categories.
Now updated and expanded to cover the latest technologies, this full-color text on clinical refraction uses an easy-to-read format to give optometry students and practitioners all the important information they need. Also covers a wide range of other aspects of the eye exam, including anterior and posterior segment evaluations, contact lens, ocular pharmacology, and visual field analysis. Four new chapters cover wavefront-guided refraction, optical correction with refractive surgeries, prosthetic devices, and patients with ocular pathology. Offer precise, step-by-step how-to's for performing all of the most effective refractive techniques. Presents individualized refractive approaches for the full range of patients, including special patient populations. Contriubtors are internationally recognized, leading authorities in the field. New full-color design with full-color images throughout. Completely updated and expanded to include current technologies. A new chapter on Optical Correction with Refractive Surgeries, including keratoplasty, traditional refractive surgeries (e.g. LASIK and PRK), crystalline lens extraction with and without pseudophakia, the new presbyopic surgery, etc. A new chapter on Wavefront Guided Refraction provides information on the advantages and limitations the Hartmann-Shack Method for objective refraction plus aberrometry and the refraction and the use of in the correction of the eye with spectacles, contact lenses, and refractive surgery. A new chapter on Patients with Ocular Pathology reflects the most current knowledge of patients with ocular pathologies. Provides information on Optical Correction with Prosthetic Devices, including corneal onlays, stromal implants, phakic intraocular lenses, etc. Includes new chapters and/or discussions on such topics as: Aberrations of the Eye, Refractive Consequences of Eye Pathology, Diagnosis and Treatment of Dry Eye, Diagnosis of Pathology of the Anterior Segment, Diagnosis of Glaucoma, and Diagnosis of Pathology of the Posterior Segment. Visual Acuity chapter expanded to include the effect of refractive error on visual acuity and statistics on how much of a change in visual acuity is significant. Objective Refraction, Corneal Topography, and Visual Field Analysis chapters include the addition of new electro-optical and computer techniques and equipment. Chapters on Multifocal Spectacle Lenses and Contact Lenses now cover newer progressive addition lenses and contact lenses that are now on the market. Electrodiagnosis chapter revised to take a more clinical approach.
Clinical Refraction Guide
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Author : Ajay Kumar Bhootra
language : en
Publisher: Jaypee Brothers Medical Publishers
Release Date : 2019-06-30
Clinical Refraction Guide written by Ajay Kumar Bhootra and has been published by Jaypee Brothers Medical Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-06-30 with Medical categories.
Retinoscopy is an eye exam that determines the refractive error of the eye (long sighted, short sighted, astigmatism). A refraction test indicates the strength of the prescription needed for glasses or contact lenses. The new edition of this book provides a concise overview of clinical refraction. Presented in an easy to read format, it is divided into two main sections. The first part explains basic clinical procedures for routine refraction, beginning with an introduction to instruments and the procedure, followed by aspects of the test for different disorders including myopia (short sightedness), astigmatism, keratoconus and refraction in children. Section two provides in depth discussion on retinoscopy and correct use of the retinoscope. The second edition has been fully revised and updated to explain the latest advances in the field, and is further enhanced by clinical images and figures. Key points Practical guide to clinical refraction and retinoscopy Fully revised and updated second edition Explains basic procedures and instruments for refraction test and refraction in different ophthalmic disorders Previous edition (9789351520634) published in 2014
Photography In Clinical Medicine
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Author : Paola Pasquali
language : en
Publisher: Springer Nature
Release Date : 2020-12-09
Photography In Clinical Medicine written by Paola Pasquali and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-12-09 with Medical categories.
This book explains how medical photography is part of the workflow in many specialties: it is needed for registries, to preserve information, for follow up, second opinion and teaching, among others. The book gathers information on this field, providing valuable practical tips for those that have never used photography for medical uses as well as those who use it regularly. Covering specialities ranging from dermatology, plastic surgery, dentistry, ophthalmology and endoscopy to forensic medicine, specimen photography and veterinary medicine, it highlights standardization for each procedure and relevance to ethical, patients’ perception of medical photography, cybersecurity and legal aspects. The book also presents practical sections explaining how to organize a photographic file, coding, reimbursement, compliance, use of social media and preservation as well as in depth concepts on sharp focus on blurred vision. This volume will appeal to all clinicians and practitioners interested in acquiring a high level of technical skill in medical photography.
Manual Of Optics And Refraction
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Author : PK Mukherjee
language : en
Publisher: Jaypee Brothers Medical Publishers Pvt. Limited
Release Date : 2014-12-20
Manual Of Optics And Refraction written by PK Mukherjee and has been published by Jaypee Brothers Medical Publishers Pvt. Limited this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-12-20 with Medical categories.
Errors of refraction are the most common ocular disorders for which people seek ophthalmic consultancy. Manual of Optics and Refraction is a comprehensive guide to the optics of the human eye and various errors of refraction, including their clinical presentation and management. Divided into eleven chapters, the text extensively covers the physical properties of light, its modification as laser and fibre optic devices, various types of optical devices, their optics, errors of refraction and their clinical presentation and management. Manual of Optics and Refraction provides a comprehensive and clinically based guide to visual optics. The text offers a straightforward approach to the understanding of clinical optics, refraction and contact lens optics, making it useful to trainees, postgraduates and medical teachers, as well as practicing optometrists. Key Points The complex concepts of optics are given easy-to-understand explanations, enhanced by simple illustrations Over 300 full colour and black and white illustrations, images and tables Covers scientific principles, optical devices and refractive surgeries
Drug Targeting And Stimuli Sensitive Drug Delivery Systems
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Author : Alexandru Mihai Grumezescu
language : en
Publisher: William Andrew
Release Date : 2018-05-21
Drug Targeting And Stimuli Sensitive Drug Delivery Systems written by Alexandru Mihai Grumezescu and has been published by William Andrew this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-05-21 with Science categories.
Drug Targeting and Stimuli Sensitive Drug Delivery Systems covers recent advances in the area of stimuli sensitive drug delivery systems, providing an up-to-date overview of the physical, chemical, biological and multistimuli-responsive nanosystems. In addition, the book presents an analysis of clinical status for different types of nanoplatforms. Written by an internationally diverse group of researchers, it is an important reference resource for both biomaterials scientists and those working in the pharmaceutical industry who are looking to help create more effective drug delivery systems. Shows how the use of nanomaterials can help target a drug to specific tissues and cells Explores the development of stimuli-responsive drug delivery systems Includes case studies to showcase how stimuli responsive nanosystems are used in a variety of therapies, including camptothecin delivery, diabetes and cancer therapy
Channelopathies
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Author : F. Lehmann-Horn
language : en
Publisher: Elsevier
Release Date : 2000-11-16
Channelopathies written by F. Lehmann-Horn and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-11-16 with Medical categories.
This book describes human hereditary ion channel diseases of voltage- and ligand-gated ion channels covering the diverse fields of medicine myology, neurology, cardiology, and nephrology requiring a wide and interdisciplinary readership. Interesting parallels in pathogenetic mechanisms of disease are especially emphasized to interest even highly specialized readers in entities outside of their fields. Each author has written an objective overview of his or her particular subject in a way that should allow the reader within a short period of time to obtain a comprehensive picture of the present state of art.
Becker Shaffer S Diagnosis And Therapy Of The Glaucomas
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Author : Bernard Becker
language : en
Publisher:
Release Date : 1970
Becker Shaffer S Diagnosis And Therapy Of The Glaucomas written by Bernard Becker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Medical categories.
Roy And Fraunfelder S Current Ocular Therapy
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Author : Frederick Hampton Roy
language : en
Publisher: Elsevier Health Sciences
Release Date : 2008-01-01
Roy And Fraunfelder S Current Ocular Therapy written by Frederick Hampton Roy and has been published by Elsevier Health Sciences this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-01-01 with Medical categories.
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.
Practical Guide To Neurogenetics E Book
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Author : Thomas T. Warner
language : en
Publisher: Elsevier Health Sciences
Release Date : 2008-11-04
Practical Guide To Neurogenetics E Book written by Thomas T. Warner and has been published by Elsevier Health Sciences this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-11-04 with Medical categories.
This simple guide to neurogenetics demystifies the overwhelming amount of information on the subject so you can identify key clinical features and understand your management options. Reach relevant differential diagnoses and provide appropriate counseling to your patients using the symptom-based approach. By integrating genetic and neurological approaches to diagnoses, this book ensures that the neurological consequences of a genetic diagnosis and the genetic consequences of a neurological diagnosis are clear and explicit. Concise and portable, this book is ideal for easy reference in clinical use. Details the underlying basic science and clinical features of genetic disorders by taking a symptom-based approach to provide you with a comprehensive understanding of the field. Focuses on the clinical application of neurogenetics to be of practical use to you in the clinic. Clarifies the neurological consequences of a genetic diagnosis and the genetic consequences of a neurological diagnosis by integrating genetic and neurological approaches to diagnoses. Discusses and evaluates necessary investigations so you know when to use them and when to refer. Highlights diagnostic and therapeutic tips so you can learn new concepts or refine your skills in practice. Refers to online sources, such as Online Mendelian Inheritance in Man (OMIM) and others, to help you supplement your knowledge.