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The cornea

Category: Diseases of The Eye and Ear

This is almost circular in shape. It is convex anteriorly and
projects forward from the sclerotic in the same manner that a watch glass
does from its case. This layer covers what we call the pupil.

The second tunic or coat (membrane) is formed from behind forward by the
Choroid, the ciliary body and the Iris. The choroid is the vascular and
dark coat covering the posterior five-sixths of the globe. The ciliary
body connects the choroid to the circumference of the iris. The iris is
the circular muscular septum (division) which hangs vertically behind the
cornea, presenting in its center a large rounded opening, the pupil.

The choroid is a thin highly vascular membrane of a dark brown or
chocolate color and is pierced behind by the optic nerve and in this
situation is firmly adherent to the sclerotic.

The ciliary body comprises three muscles for its make-up and connects the
choroid to the circumference of the iris.

The Iris (rainbow) has received its name from its various colors in
different individuals. It is a thin, circular shaped, contractile curtain,
suspended in the aqueous (watery) humor behind the cornea and in front of
the lens, being perforated a little to the nasal (nose) side of its centre
by a circular opening, the pupil, for the transmission of light. By its
circumference it is continuous with the ciliary body, and its inner or
free edge forms the margin of the pupil. The anterior surface of the iris
is variously colored in different individuals and marked by lines which
converge toward the pupil.

Next: The Retina


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