Reprint of the original, first published in 1873.

Excerpt from On Long, Short, and Weak Sight: And Their Treatment, by the Scientific Use of Spectacles Snellen's test-types p. 33. Method of determining the acuteness of vision 34. Definition of the term Range of Accommodation 35. Donders' method of determining it 36 - 39. Von Graefe's method 39-41. Von Graefe's wire Optometer 42. Anomalies of accommodation 43. 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.