The lenses and humors of the eye must be very exactly arranged, in order that the sight may be perfect. They must be so arranged that the images of the objects shall be formed distinctly on the retina. In nearsighted persons the lenses and humors are so arranged as to make the rays that form the images from together too quickly, before they reach the retina, as shown in the figure.

Nearsighted Vision

The lenses and humors of the eye must be very exactly arranged, in order that the sight may be perfect.…