Ocular Refraction and the Shadow Test (Classic Reprint)

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Excerpt from Ocular Refraction and the Shadow TestA science is founded, not upon uncertainties, but upon facts, therefore, subjective examination of the eye is not scientific, though we grant that it has its place and should be used. It is only within the past few years, that the diagnosis of errors of refraction and their correction by the use Of glasses has been scientific. Examination being conducted objectively, the refractive condition of the eye is ascertained by comparison of actual conditions with a known standard.This work is a departure from the usual style Of Optical text books and is based upon methods employed by the author in successful daily practice. The subject of lenses and their properties is dealt with as fully as possible, as it is necessary in order to understand ocular refraction, to be familiar with this subject. The refractive media of the eye is equivalent to a lens.It may be said at first glance that too much time is devoted to subjects that have little relation to Optics, that the Optical student need not bother with such topics. The answer is, that time spent in the study Of any subject that is in any way related to optics, is time well spent. The Optician must not fear to know too much but too little.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.