Defective Vision - and the principles on which it may be corrected by optical means - read by appointment before the Medical Society of Virginia, at the annual session in Staunton, November 20th, 1872 is an unchanged, high-quality reprint of the original edition of 1873. Hansebooks is editor of the literature on different topic areas such as research and science, travel and expeditions, cooking and nutrition, medicine, and other genres. As a publisher we focus on the preservation of historical literature. Many works of historical writers and scientists are available today as antiques only. Hansebooks newly publishes these books and contributes to the preservation of literature which has become rare and historical knowledge for the future.