| filtering cicatrix | A cicatrix through which fluid may seep; denoting especially a form of cicatrix produced by an operation for glaucoma, through which there is subconjunctival drainage of aqueous humor. (05 Mar 2000) |
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| filtering operation | A surgical procedure for creation of a fistula between the anterior chamber of the eye and the subconjunctival space in treatment of glaucoma. (05 Mar 2000) |
| filtering surgery | 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) (12 Dec 1998) |