Excerpt from An Additional Test for the Diagnosis of Ametropia, With a Method to Determine Its Various Degrees A disc of tin placed upon a spring candlestick is also depicted in a cut, and this appliance has been found of great clinical service in ascertaining the distance between the two points of light, and hence the degree of ametropia corresponding thereto in the table. 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.