Defective Eyesight

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Excerpt from Defective Eyesight: The Principles of Its Relief by GlassesFirst attempts to accurately estimate the visual power. Jaeger's and Snellen's test-types. The choice of glasses on seien tific principles made practicable by Donders. - The invention of the ophthalmoscope. - Apparatus required for testing vision. Conditions of the eye requiring glasses - The varieties of astig matism. The ophthalmometer. Asthenopia. Definitions of the conditions to be discussed in the following chapters.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.