The Illustrated Optical Manual

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Excerpt from The Illustrated Optical Manual: Or Handbook of Instructions for the Guidance of Surgeons in Testing Quality and Range of Vision, and in Distinguishing and Dealing With Optical Defects in General The circumstances under which I was originally led to put forth this Manual of Instructions for testing and dealing with the various conditions of vision liable to be met with in persons seeking em ployment, or already engaged, in military service, have been ex plained in the two previous editions of this work, which were pub lished in the years 1862 and 1874, and do not require repetition. Since the second edition of the Manual was published, so great have been the changes in some of the practical parts of Optical manipulation, and such advances have been made in respect to length of range, and capacity for accurate fire, in the weapons with which soldiers now have to deal, that many passages of the Manual of that date have become obsolete, and the present edition has had to be less revised than re-written. When the increased and increasing importance attached to the expert use of firearms of all descriptions, both ri¿es and guns, at very long ranges is remembered, it may reasonably be expected that before long even greater attention will be given by all persons in this country who are engaged in military pursuits to questions of quality of eyesight, and that more information will be demanded on the subject from medical officers than has hitherto been required from them. In the army, the firearm with which the infantry soldier has to become familiar is his ri¿e, and this he can only use with thorough efficiency when he has visual power enough to enable him to see clearly the objects at which he is required to aim, and to judge accurately their distances, whatever the range over which a projectile fired from the ri¿e may have to travel in order to reach them. A great deal of attention has been given of late vears to improving the modes of instruction in musketry practice. 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.