Filtering Surgery

**Definition:** A surgical procedure used in treatment of glaucoma in which an opening is created through which aqueous fluid may pass from the anterior chamber into a sac created beneath the conjunctiva, thus lowering the pressure within the eye. (Hoffman, Pocket Glossary of Ophthalmologic Terminology, 1989)

**Tree numbers:** - E04.540.450

**Synonyms:** - Surgery, Filtering - Filtration Surgery - Surgery, Filtration