when increased pressure damages the optic nerve
Eye pressure results from a delicate balance between fluid - called the aqueous humor -- entering into and draining out of it. In some patients, due to thickening or narrowing of the draining tissues, fluid can build up leading to increased eye pressure. This is known as glaucoma. With time, high pressures cause a slow atrophy of the optic nerve, which in turn leads to loss of side and central vision.
There are two main types of glaucoma
Open Angle glaucoma is the most common. The drainage structures are open mechanically but somehow are just not working well.
Narrow Angle glaucoma is where the iris tissue physically is constricting the drainage structures. It is less common and is found usually in far sighted people.
Did you know?
You cannot feel when your pressure is too high or low.
Glaucoma can happen without any symptoms or pain.