Download or read book Elementary Ophthalmic Optics Including Ophthalmoscopy Retinoscopy written by Sir John Herbert Parsons and published by . This book was released on 1901 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Elementary Ophthalmic Optics written by J. Herbert Parsons and published by . This book was released on 2015-08-04 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Elementary Ophthalmic Optics: Including Ophthalmoscopy Retinoscopy This book is intended to supply the student of ophthalmology with all the optics which is necessary for an intelligent knowledge of his subject. The proofs are in some cases a little confusing at first reading, but they never demand more than a very elementary acquaintance with mathematics. Even where a trigonometrical nomenclature has been inevitable the meaning of the signs is usually self-evident. Special care has been taken to emphasise all important propositions by italics, so that those who do not care to grapple with the proofs are provided with a readily accessible synopsis of results. A short bibliography of the best books upon the subject has been added, so that the advanced student may know where to look for further information. It is hoped that the book will prove a useful addendum to such practical works as Morton's Refraction of the Eye, Hartridge's Refraction, etc. 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.
Download or read book Elementary Ophthalmic Optics Including Ophthalmoscopy and Retinoscopy written by Sir John Herbert Parsons and published by Rarebooksclub.com. This book was released on 2013-09 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 edition. Excerpt: ...the retinal image depends upon two factors: (1) the visual angle subtended by the object; (2) the distance between the second nodal point and the retina ((?2). If the visual angle be kept constant and minimal, the retinal image, and therefore the visual acuity, will vary directly as the distance between the second nodal point and the retina. If we replace d in equations (9), p. 70, by F' + y, where y is the variable distance of the correcting lens from the anterior focal plane of the eye, we have (remembering that F = F = F', say) By (1), p. 87, the distance of the retina from the posterior focus of the emmetropic eye = x = .pit-nil r-.r'F.-.Fp.. (9). That is, the uncorrected hypermetropic eye has smaller, and the uncorrected myopic eye has larger, retinal images than the emmetropic eye. We must now consider the effect of accommodation upon the images. The optical effect of accommodation is to increase the distance between the second nodal point and the retina. Hence, accommodation is accompanied by increase in the size of the retinal image. The relative visual acuity, or visual acuity for near objects, is therefore greater than the absolute visual acuity, or acuity for distant objects. This accounts in large measure for the difficulty in relaxing the accommodation in ophthalmoscopic examination by the direct method. The uncorrected hypermetropic eye has smaller retinal images than the emmetropic eye; these are increased beyond the size of the emmetropic images by a correcting lens outside the anterior focal plane of the eye. Similarly the correction of presbyopia also results in the production of larger images. The uncorrected myopic eye has larger retinal images than the emmetropic eye; these are made smaller than the...
Download or read book Elementary Ophthalmic Optics written by John Herbert Parsons and published by Sagwan Press. This book was released on 2018-02-06 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Elementary Ophthalmic Optics written by John Herbert Parsons and published by Nabu Press. This book was released on 2013-10 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.
Download or read book ELEM OPHTHALMIC OPTICS written by John Herbert Sir Parsons, 1868-1957 and published by . This book was released on 2016-08-25 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Elementary ophthalmic optics written by Sir John Herbert Parsons and published by . This book was released on 1901 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Retinoscopy or Shadow Test in the Determination of Refraction at One Meter Distance written by James Thorington and published by . This book was released on 1912 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ophthalmoscopy retinoscopy and refraction written by William Albert Fisher and published by . This book was released on 1922 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ELEM OPHTHALMIC OPTICS written by John Herbert Sir Parsons, 1868-1957 and published by Wentworth Press. This book was released on 2016-08-25 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Retinoscopy or Shadow Test in the Determination of Refractions at One Meter Distance with the Plane Mirror written by James Thorington and published by . This book was released on 1906 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Retinoscopy or Shadow Test in the Determination of Refraction at One Meter of Distance with the Plane Mirror written by James Thorington and published by . This book was released on 1898 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book How to Use the Ophthalmoscope written by Edgar Athelstane Browne and published by . This book was released on 1876 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ophthalmoscopy Retinoscopy and Refraction written by William Albert Fisher and published by . This book was released on 1931 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Refractionist written by and published by . This book was released on 1926 with total page 1362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ophthalmoscopy Retinoscopy and Refraction written by W. A. Fisher and published by . This book was released on 2013-10 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ophthalmoscopy, Retinoscopy and Refraction By WA Fisher Contents I--Ophthalmoscopy II--Diseases of the Retina III--Diseases of the Choroid Iv--Diseases of the Optic Nerve V--Field of Vision: Indirect and Direct Ophthalmoscopy VI--Systemic Examination of Eye VII--Glaucoma VIII--Optical Principles; Test Type; Lenses; Refraction; Cycloplegics IX--Applied Refraction; Astigmatism;Presbyopia X--Heterophoria--Muscular Insufficiency XI--Retinoscopy XII--Measurement of Lenses; Prescription writing; Transposition; Frame Fitting Introduction Ophthalmoscopy is generally considered as a difficult subject. It is one that is not taught either practically or successfully in medical colleges, with the result that scarcely two per cent of practitioners coming to the author for postgraduate teaching know how to use the ophthalmoscope. In the author's opinion, ophthalmoscopy and the fitting of glasses belong to the general practitioner, and acquirement of the necessary practical and theoretical knowledge is easy, interesting and within the reach of all. This book has been written with the intention of teaching medical practitioners and students the practical use of the ophthalmoscope and retinoscope, with easy application of methods of study, to the detection of detection of diseases of the interior of the eye, and for the fitting of glasses when they are indicated. By mastering the methods here described and equipping himself with the necessary instruments, there is no reason why the general practitioner should not prescribe so as to correct the common errors of refraction and become proficient in the use of the ophthalmoscope. ------------------------------------------------------------------------------------------------------------------------------------------ Windham Press is committed to bringing the lost cultural heritage of ages past into the 21st century through high-quality reproductions of original, classic printed works at affordable prices. This book has been carefully crafted to utilize the original images of antique books rather than error-prone OCR text. This also preserves the work of the original typesetters of these classics, unknown craftsmen who laid out the text, often by hand, of each and every page you will read. Their subtle art involving judgment and interaction with the text is in many ways superior and more human than the mechanical methods utilized today, and gave each book a unique, hand-crafted feel in its text that connected the reader organically to the art of bindery and book-making. We think these benefits are worth the occasional imperfection resulting from the age of these books at the time of scanning, and their vintage feel provides a connection to the past that goes beyond the mere words of the text.
Download or read book Nerve Exhaustion written by Sir Maurice Craig and published by . This book was released on 1922 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
