SCHOOL LIFE, AND ITS INFLUENCE ON SIGHT (CLASSIC REPRINT)

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