|When a trabeculectomy is performed to treat glaucoma, a small piece of the wall of the eye is removed and a "flap" is created to allow excess fluid to drain. This flap, created under the conjunctiva, forms a blister-like reservoir called a Bleb. A bleb usually has a tiny suture in it to keep the flap from healing shut. The fluid seeps out under the conjunctiva and is absorbed by the body.
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