The Shadow Test in Ocular Diagnosis

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Excerpt from The Shadow Test in Ocular Diagnosis: Without Prejudice as to Method, Mirror, Distance or InstrumentSince its discovery shadow testing has continued to be come increasingly interesting and popular with those who are engaged in refractive work, and no well posted and equipped refractionist would think of ignoring or neglect ing it. To the initiate in this work, as well as to many otherwise well posted refractionists who have thus far dis regarded the method, our little book offers a means of be coming thoroughly familiar with all of its practical fea tures. It is put out for that purpose.But shadow testing is not a book affair. No one can be come an expert at shadow testing by reading a book or a dozen books. It is an art and as an art the essential thing is to learn to do by doing. Unless one is ready to lay hold Of the art and by practice acquire dexterity in it, this book and every other book bearing on the subject may as well be thrown aside. In the twelfth chapter a. Course of prae tice with the schematic eye is given. Any one who follows the directions there given, amplifying them according to his need, will very quickly catch the whole meaning of the test. If that work is done in connection with reading the previous chapters, it will be all the better.In preparing the manuscript for this book it has beenendeavored to make the treatment of any phase of the test as simple as the test itself. If the language at some points appears involved it is because that which the language attempts to describe is involved. A thing cannot be made, by any art of language, as simple as it is, although it can easily be made much more difficult. If our language does not give a clear idea at any particular point, go to the phenomenon itself and have the matter thoroughly ex plained to you. It is also most difficult to represent in a drawing the peculiar light effects that are obtained in the process of shadow testing an eye. If the illustrations do not seem quite real, go to the test itself for those effects. You can get them better there than anywhere else.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.