Anterior chamber paracentesis is a surgical procedure used to treat conditions that involve elevated intraocular pressure (IOP), such as acute angle-closure glaucoma or infections in the eye. During the procedure, a small needle or microcannula is used to remove a small amount of aqueous humor from the anterior chamber of the eye to reduce pressure and relieve symptoms.

This technique is often used as an emergency measure to quickly lower IOP and prevent optic nerve damage in patients with acute glaucoma. It is a quick and minimally invasive procedure, often performed in a clinical setting.