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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.



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