Aqueous humor is the clear liquid inside the front part of the eye. It nourishes the eye and keeps it inflated. The eye constantly produces a small amount of aqueous humor while an equal amount flows out through the trabecular meshwork in the drainage angle.
Imbalances in the creation and drainage of aqueous humor can lead to high intraocular pressure (eye pressure or IOP). High intraocular pressure is a major part of glaucoma and can damage vision.