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Your eye functions much like a camera. In order to have normal
(20/20) vision, all of the parts must work together properly, and
the optical system must be correctly aligned. Light rays form objects
in our environment are bent (refracted) by the cornea and the crystalline
lens inside the eye. When the eye is working properly, a sharp image
is formed on the retina, a layer of nerve cells lining the inside
of the eyeball that can sense light. When the optical system of
the eye does not focus properly, we say that the eye has a "refractive
error". Refractive errors can be corrected with glasses, contact
lenses, or surgery, to restore clear vision. This section describes
the optics, anatomy, and the refractive errors of the eye.
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