The American Journal of Ophthalmology, Vol. 12
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| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from The American Journal of Ophthalmology, Vol. 12: January, 1895 It may be of interest to note that the gross productions of these firms amounted to over $2,000,000 in 1892. Such practical support certainly portends an enduring future of the prism-diopter, about which so much pro and con has been written since its first appearance in ophthalmic literature.2 In this paper it will be taken for granted that the reader is at least familiar with the principles of the prism-diopter, so that only the relation which exists between it and the lens-diopter will here be repeated, to-wit: A Lens Which Is Decentered One Centimeter Will Produce As Many Prism-Diopters As The Lens Has Diopters Of Refraction. A knowledge of this law will frequently enable the oculist to change the form of his prescription so that it may safely be entrusted for execution to any optician capable of locating the optical center of a lens, and who is provided with no other instrument of measure than a pocket centimeter scale. As the optician, generally speaking, is not allowed to exercise his own judgment in transforming prescriptions, it is necessary that the oculists instructions be explicit respecting the proper method of putting his prescription into the best practical form. A few examples will serve to illustrate the method of applying the law of decentration. 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.
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