what causes eye pressure to rise
Ocular Hypertension Causes. Elevated intraocular pressure is a concern in people with ocular hypertension because it is one of the main risk factors for glaucoma. High pressure inside the eye is caused by an imbalance in the production and drainage of fluid in the eye (aqueous humor).
Fluid is made in the ciliary body and exists the trabecular meshwork drain. If more aqueous fluid fills the globe and can't exit fast enough, then the eye pressure will increase. This ocular pressure is transmitted back to the optic nerve head and causes mechanical strain leading to glaucomatous changes and cell death.
Open-angle glaucoma. Open-angle glaucoma is the most common form of the disease. The drainage angle formed by the cornea and iris remains open, but the trabecular meshwork is partially blocked. This causes pressure in the eye to gradually increase. This pressure damages the optic nerve.