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
When the increased and increasing importance attached to the expert use of firearms of all descriptions, both rifles 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 rifle, 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 rifle may have to travel in order to reach them. A great deal of attention has been given of late years to improving the modes of instruction in musketry practice.
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