Intraocular Pressure (IOP) refers to the fluid pressure inside the eye. It is determined by the balance between the production and drainage of aqueous humor, the clear fluid that nourishes the eye and maintains its shape. Normal IOP ranges from 10 to 21 mmHg, and maintaining this pressure is crucial for eye health. Elevated IOP can lead to glaucoma, a condition that can damage the optic nerve and result in vision loss. Regular eye exams are important for monitoring IOP, as early detection and treatment can help prevent complications associated with high pressure in the eye.