Excerpt from An Essay on Vision, Briefly Explaining the Fabric of the Eye, and the Nature of Vision: Intended for the Service of Those Whose Eyes Are Weak or Impaired HE following Essay is so short, that there is no occasion for a long preface to introduce it to the readers' notice. One of the principal ends of it is to do away a general prejudice in favour Of spectacles. 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.