School Life, and Its Influence on Sight (Classic Reprint) epub bedava indir
itibaren George Reuling
Kitap açıklaması
Excerpt from School Life, and Its Influence on SightWhen we look at near objects a change takes place in the interior of the eye, which change is associated with a certain ex ertion. The eye being an optical instrument is supplied with a lens, which grows more convex in order to produce images of very close 'objects upon the retina. This increased curvature is brought about in the following manner: The anterior surface of the lens gets to be more convex and moves forwards, whilst the posterior surface, although it also becomes more convex, does not change its position. The ciliary muscle produces this change in the curvature of the lens; according to late experiments the rationale of this action is to be explained in the following way The ciliary muscle, or the muscle of the accommodation, con tracts and pulls the second lining membrane of the internal eye, the choroid, forwards, the anterior and internal margin of the ciliary body inwards, and lengthens the fibres of the ligament which subtends the lens; by this means the space around the iris is widened and the interval between the anterior surface of the lens and the cornea is narrowed in consequence, because of the pressure exerted upon the capsule of surrounding envelop of the lens, whereby its curvature is increased as above explained.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.
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