n.a
term describing a
condition of the eye in which the distance from the opening in the front of the eye to the back
wall of the eyeball is too
short, thus causing poor vision. (An axis is the
line straight through the middle of an
object, such as a
straight line from the
object of vision to the back of the eyeball.) The eyeball is
similar to a camera. The front of the eye lets in light, which arrives as random and scattered rays. These rays are directed and brought together at a certain
point by the lens, forming a
clear image on the back
wall of the eyeball,
similar to the way a photographic
image is projected on a
screen. The back
wall of the eyeball must be a certain distance from the lens so that it receives the light at the exact
point where the
image focuses. If it is too near to the lens the light will
hit it before the
image has had a chance to focus and it will
look blurry.