Hyphema is called the hemorrhage at the anterior chamber of the eye (the gap between cornea and iris). It is caused when blood vessels bleed on the iris and leak into the transparent aqueous humor.
Hyphema is characterized by blood concentration on the anterior chamber that is obvious at the eye. The red cells are visible only with magnification. Even the small amount of blood in the anterior chamber can cause vision loss, when is mixed with aqueous humor.
Bleeding in the anterior chamber is often caused by a sudden eye hit. It may also be associated with eye surgery. Other causes may be the abnormal vessel development in the eye and some ocular tumors.