Columbia University in the City of New York

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Excerpt from Columbia University in the City of New York: Courses in Practical Optics for Optometrists, 1915-1916Recent years have likewise witnessed extraordinary progress both in ophthalmology and in applied optics, and it would be difficult to overestimate the importance of the applications in this domain Of science Of the remarkable theories of Allvar Gullstrand, who was awarded the Nobel Prize in Medicine in 1911, and upon whom the mantle Of von Helmholtz seems to have fallen. Every field of optics has felt already the in¿uence Of this new leader, and the present is a period Of great activity and promise in every direction in optics.Few persons are perhaps aware of the rapid rate at which spectacle Optics in particular is developing into a severe scientific pursuit. It would be a very superficial view to suppose that modern improvements in the manufacture of spectacles consisted chie¿y in the introduction of lighter frames and Of new processes of fusing bifocal lenses or of grinding toric surfaces, although these and other mechanical refine ments are by no means insignificant achievements. Under the in¿uence Of the new teaching, the theories Of vision have been revised and new points of view have led to the calculation and design Of wonderfully improved types and combinations of spectacle-lenses, which are only just now finding their way to England and America. Great strides have'been made in these countries in the training of technical opti eiaus and optometrists to deal with the complex and Often very in tractable problems Oi astigmatism, of both eyes and lenses, and with the investigation Of the various anomalies and defects of vision that require to be corrected.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.