Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 132
re 108.) Long-sightedness isjust the opposite ofshort-sightedness,and is caused byjust the opposite things. The eyeball is too short, or the lens is too thin. This makes the image fall back of the retina, so that it is necessary to hold the object far away in ^ y^^ ^*\ order to get the image to… … Figure 108.—A Short-sighted EyeCorrected. t==4^ 122 REFRACTION AND LENSES is much the hardest to correct. It may be caused by severalthings, such as irregularities in the thickness or texture of the cornea, or in thecrystalline lens. Figure 111 showsan eye with irregularthickness of thecornea. The…
Physics
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
