"Aqueous outflow" refers to the movement or drainage of aqueous humor from the eye. Aqueous humor is a clear, watery fluid that fills the anterior chamber of the eye, which is the space between the cornea and the iris. It is produced by the ciliary body and helps maintain the shape and health of the eye. Aqueous outflow plays a crucial role in regulating the intraocular pressure (IOP) within the eye. The balance between the production and drainage of aqueous humor is essential for maintaining normal IOP. If the aqueous outflow is compromised or reduced, it can lead to an increase in IOP, which is a risk factor for glaucoma, a group of eye conditions that can cause damage to the optic nerve and vision loss.