Final answer:
Glaucoma is the eye condition that occurs when the aqueous humor cannot drain properly, leading to increased intraocular pressure and potential vision loss.
Step-by-step explanation:
The eye condition resulting from the inability of the aqueous humor to drain from the eye is called glaucoma. The aqueous humor is a watery fluid that fills the anterior chamber of the eye, which contains the cornea, iris, ciliary body, and lens. The shape of the eye and its ability to focus properly depend on maintaining a certain amount of fluid pressure, known as intraocular pressure. When the circulation of the aqueous humor is blocked, it can lead to an increase in this pressure, resulting in glaucoma. This blockage and subsequent pressure buildup can damage the optic nerve, leading to vision loss or even blindness if not treated.