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INJURIES OF THE IRISCategory: 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 to 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. Next: CATARACT Previous: FILM ON THE EYE PTERYGIUM
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