The Ciliary Muscle is
located in each eye in the human body.
It is one of three zones of the ciliary
body (which connects
the choroid with
the iris).
Contraction and relaxation of the ciliary muscle alters
the curvature of the lens
The correct term for the adjustment of the shape of the lens to change
the focus of the eye is "accommodation".
This process may be described simply as the balance existing at any one
time between between two states:
Ciliary Muscle relaxed:
The suspensory ligaments attached to the ciliary body that hold the lens
in place are stretched, causing the lens to be relatively flat.
This enables the eye to focus on distant objects.
Ciliary Muscle contracted:
The tension on the suspensory ligaments attached to the ciliary body
is reduced allowing the lens to be relatively round.
This enables the eye to focus on close objects (near to the eye). The subject of visual (also
known as "physiological")
optics is a key component of many courses within the fields of
both biology and physics. It is also an essential consideration
in the design of displays and control units used in many applications
from
televisions
and mobile telephones to advanced aircraft. In the context of engineering
"visual optics" is one of several medical and psychological topics in
the important area of "Human Factors".
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