INJURIES OF THE IRIS
Categories:
Diseases of The Eye and Ear
Concussion of the eyeball may produce an irregular
dilation of the pupil. This is due to paralysis of the sphincter muscle of
the pupil, but it generally disappears. The edge of the pupil may be torn
in the form of one or more rents, or the iris may be separated from its
root at its circumference, leaving a clear space, or it may be entirely
torn from its attachment.
Perforating wounds are accompanied by injury
o the lens and other
structures; when the cornea is wounded it is often complicated by falling
of the lens. When a small foreign body passes through the cornea and iris
a small opening may be seen. The greatest danger from wounds is due to
infection and if it reaches the iris, it may produce violent iritis. If
the lens is displaced or absent the iris being without support, will
tremble with every movement of the eye. In some cataract operations, if
there is a loss of the "Vitreous" body a part of the iris may be folded
upon itself, thus enlarging the pupil in that point.