Final answer:
Intraocular pressure is the kind of liquid that keeps the eyes at a certain pressure. It maintains the shape of the eye, and when it is blocked, it can lead to glaucoma.
Step-by-step explanation:
The kind of liquid that keeps the eyes at a certain pressure is called intraocular pressure. Intraocular pressure is a fluid pressure that maintains the shape of the eye and is normally in the range of 12.0 to 24.0 mm Hg. When the circulation of fluid in the eye is blocked, it can lead to a buildup in pressure, causing a condition called glaucoma.