The Determination of the Necessity for Wearing Glasses (Classic Reprint)

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Excerpt from The Determination of the Necessity for Wearing GlassesThe signs and are appended to records Of vision in this country to indicate as follows: If a patient's vision be {l3 be can read all of No. XL and one or two of No. XXX. If it be }3 he can read nearly all, but not quite all of No. XL, and so forth. Many persons, especially young persons, can read No. XX at a greater distance than 20 feet, but H. Is an average representation of normal vision in average illumination.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.