The Practical Medicine Series Of Year Books Comprising Ten Volumes On The Years Progress In Medicine And Surgery Vol 3

Author : Gustavus P. Head
Publisher : Forgotten Books
ISBN 13 : 9780260796042
Total Pages : 364 pages
Book Rating : 4.7/5 (96 download)

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Download or read book The Practical Medicine Series of Year Books, Comprising Ten Volumes on the Year's Progress in Medicine and Surgery, Vol. 3 written by Gustavus P. Head and published by Forgotten Books. This book was released on 2017-11-11 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Practical Medicine Series of Year Books, Comprising Ten Volumes on the Year's Progress in Medicine and Surgery, Vol. 3: The Eye, Ear, Nose and Throat; December 1901 Normal Variations in the Size of the Blind Spot. H. F. Hansell,1 after examining Mariotte's spot in thirty seven eyes of emmetropes, eleven hyperopes and four myopes, finds that the distance from the center of the blind spot to the fixation point is a little longer in the right than in the left eye of emmetropes; in hyperopia the average distance is 3 mm. Longer in the left than in the right eye, while the longest and shortest distance is almost the same in each eye. In myopia the cases were so few that the aver ages may be misleading. In comparing the three varieties of refraction we find that the greatest as well as the shortest distance is found in myopia. The center of the blind spot is, with a few exceptions, below a horizontal line running through the point of fixation. The shape of the blind spot in emmetropia is oval, with the long diameter in the ver tical axis. In four of the cases the outlines were circular and in two the long axis was horizontal. This would seem to show that the optic disc is seldom circular, but, in the majority of cases, oval. In emmetropia the long diameter of the blind spot averages 31 mm.; in hyperopia, 34 mm. And in myopia, 38 mm. It will thus be seen that the size of the blind spot is distinctly greater in myopia than in any other state of refraction. Hansell believes that an ex amination of the size of the blind spot will prove useful in cases of optic neuritis, choked disc and glaucoma as well as in other disturbances of the eye. Regeneration of the Ciliary Nerves. A. Biette2 found that a few years after an opticociliary neurectomy had been performed, the eye had again become sensitive. An an atomic examination having been made, he discovered that a regeneration of the ciliary nerves had occurred. New formations can spring from the nerve trunk, he says, and in spite of defective coaptation may penetrate the sclera and lead to irritative symptoms, especially in the ciliary body. 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.