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Hyphema is blood in the front (anterior) chamber of the eye. It may appear as a reddish tinge, or it may appear as a small pool of blood at the bottom of the iris or in the cornea.Blunt trauma to the eye can cause bleeding in the front (or anterior chamber) of the eye between the cornea and the iris. This bleeding into the anterior chamber of the eye is called a hyphema.

The anterior chamber of the eye contains a clear liquid fluid called aqueous humor. The aqueous humor is secreted by the ciliary processes in the posterior chamber of the eye. The aqueous humor passes through the pupil into the anterior chamber. The aqueous humor provides important nutrition to the inner structures of the eye.

Hyphema is a term used to describe bleeding in the anterior chamber (the space between the cornea and the iris) of the eye. It occurs when blood vessels in the iris bleed and leak into the clear aqueous. Hyphemas are usually characterized by pooling of blood in the anterior chamber that may be visible to the naked eye. The red blood cells of very small hyphemas are visible only with magnification. Even the slightest amount of blood in the anterior chamber will cause decreased vision when mixed in the clear aqueous fluid.

Bleeding in the anterior chamber is most often caused by blunt trauma to the eye. It may also be associated with surgical procedures. Other causes include abnormal vessel growth in the eye and certain ocular tumors.

A hyphema is a collection of blood in the front part of the eye. The blood may cover part or all of the iris (the colored part of the eye) and the pupil, and may partly or totally block vision in that eye.

Unlike a subconjunctival hemorrhage, which is generally harmless, a hyphema can cause permanent vision problems if not treated properly.