The Pathological Effects of Radiant Energy on the Eye PDF Download
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Author: Frederick Herman Verhoeff
Publisher:
ISBN:
Category : Eye
Languages : en
Pages : 204
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Book Description
Author: Frederick Herman Verhoeff
Publisher:
ISBN:
Category : Eye
Languages : en
Pages : 204
Get Book Here
Book Description
Author: Frederick Herman Verhoeff
Publisher:
ISBN:
Category : Eye
Languages : en
Pages : 196
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Book Description
Author: Louis 1864-1923 Bell
Publisher: Wentworth Press
ISBN: 9781373789099
Category : History
Languages : en
Pages : 196
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Book Description
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: F. H. Verhoeff
Publisher: Forgotten Books
ISBN: 9780332003238
Category : Science
Languages : en
Pages : 200
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Book Description
Excerpt from The Pathological Effects of Radiant Energy on the Eye: An Experimental Investigation All radiant energy is at present believed to consist of transverse vibrations in the hypothetical ether, all propagated at the same rate and differing only in amplitude and wave length, hence in frequency, which is the reciprocal of wave length. The uniform propagation rate in vacuo is very nearly km. Per second and the wave lengths so far as ordinarily dealt with range from about 01 to about 0002 mm. For ordinary purposes no attention need be paid to the extremely long wave lengths ranging to 1 mm., to the extremely short ones between 0001 and 0002 mm., or to the enormously shorter one still of the order of magnitude of 0000001 111m. Such as the X-rays are believed to be. For the very long waves are not present in material amount in the radiation from ordinary sources. The very short ones are absorbed by a few cm. Or dm. Of air, and the X-rays are practically only produced in apparatus intended for that purpose. The spectra given by all ordinary sources range between the more modest limits just given. In the earlier literature this spectral range used to be divided into heat rays, light rays, and actinic rays, a distinction wholly artificial since the three effects implied are far from being sharply defined. More generally the whole range is divided into the infra red portion, not ordinarily visible and extending from the longest waves to those of about 760 1111, the visible spectrum, extending from about 7601111 to about 395 and the ultra violet portion reaching from 395 up to' the neighborhood of 200 ma. This distinction is not rigorous or with sharp limits. While artificial distinctions have led to many misunderstandings,1_ all radiation of Whatever wave length is convertible into heat wheri absorbed by material bodies and may produce chemical changes as well. As a matter of fact these latter show a general tendency to increase with the frequency of the oscilla tions, so that chemical changes are rare in the infra red and increasingly frequent as one approaches the extreme ultra violet. It is this tend ency that is shown in the pathological changes which may be caused in living cells by the incidence of radiation. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Hillel Don Lazarus
Publisher:
ISBN:
Category : Eye
Languages : en
Pages : 520
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Book Description
Author: William J. Benjamin
Publisher: Elsevier Health Sciences
ISBN: 0702038970
Category : Medical
Languages : en
Pages : 2711
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Book Description
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.
Author: Myron Yanoff
Publisher: Elsevier Health Sciences
ISBN: 1455750018
Category : Medical
Languages : en
Pages : 1733
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Book Description
Get the quick answers you need on every aspect of clinical ophthalmology and apply them in your day-to-day practice. The latest edition of Ophthalmology by Drs. Yanoff and Duker presents practical, expert, concise guidance on nearly every ophthalmic condition and procedure, equipping you to efficiently overcome whatever clinical challenges you may face. Consult this title on your favorite e-reader, conduct rapid searches, and adjust font sizes for optimal readability. Compatible with Kindle®, nook®, and other popular devices. Focus on the clinically actionable information you need thanks to a more streamlined format. Make optimal use of the newest drug therapies, including Anti-VEGF treatment for wet ARMD and bevacizumab treatment for complications of diabetes. Get authoritative guidance on the newest treatment options for cornea disorders, including evolving ocular surface reconstruction techniques and new cornea procedures such as DSEK. Take it with you anywhere. Access the full text, video clips, and more online at Expert Consult. Apply the latest advances in the diagnosis and treatment of ocular disease, including new drug therapies for retinal disorders; today’s expanded uses of optical coherence tomography (OCT) and high-resolution imaging modalities; new corneal, cataract and refractive surgical approaches; and new developments in molecular biology and genetics, ocular surface disease, glaucoma testing, neuro-ophthalmology, uveitis, ocular tumors, and much more. Visualize how to proceed by viewing more than 2200 illustrations (1,900 in full color) depicting the complete range of clinical disorders, imaging methods, and surgical techniques. Hone and expand your surgical skills by watching 40 brand-new videos demonstrating key techniques in cornea, cataract, refractive, retina and glaucoma surgery. Spend less time searching thanks to a user-friendly visual format designed for quick, "easy-in easy-out" reference and an instant understanding on any topic.
Author: Donald G. Pitts
Publisher:
ISBN:
Category : Electron microscopy
Languages : en
Pages : 80
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Book Description
An argon gas forced transpiration arc (FTA) source used to produce a high intensity 180 nm to above 2.5 micron continuous spectrum was described. Calibration technics, monitoring instrumentation and procedures for studying the effects of ultraviolet on the eye were presented. An ultraviolet space energy profile was composed using data from rocket flights. (Author).
Author: American Academy of Arts and Sciences
Publisher:
ISBN:
Category : Humanities
Languages : en
Pages : 1046
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Book Description
Vol. 12 (from May 1876 to May 1877) includes: Researches in telephony / by A. Graham Bell.
Author: David Miller
Publisher: Springer Science & Business Media
ISBN: 1461247047
Category : Medical
Languages : en
Pages : 224
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Book Description
To my mind, the superoxide radical discovered by Linus Pauling more than 50 years ago is about to become a major issue in Ameri can medicine. Uncannily, Pauling's early focus on vitamin C has pointed the way to the whole catalogue of free-radical scavengers, which we in medicine will be using in the coming decade. In ophthalmology, the basic scientists have been talking about the role of free-radical induction by light for some time. They have accumulated an increasing amount of evidence supporting the idea that prolonged light exposure contributes to cataract development and retinal degeneration. Through Clinical Light Damage to the Eye, we hope to bring this message to the practicing ophthalmolo gist. Because Dr. Pauling's work bears so strongly on the key issue of free-radical damage, and because of my own great respect for him as a scientist and a man of rare courage, I invited Dr. Pauling to write the foreword to Clinical Light Damage to the Eye, which follows.
