Causes of elevated eye pressure include glaucoma and the overproduction or inadequate draining of aqueous humor, according to AllAboutVision.com. Other causes are medications and injury to the eye.
Open-angle glaucoma is a main cause of elevated eye pressure, says AllAboutVision.com. Since it is asymptomatic until considerable damage has been done to the eye, regular eye exams are recommended. The ciliary body in the eye produces aqueous humor. It fills the space between the iris and the cornea, and if there is too much or it doesn't drain, it can cause elevated eye pressure.
Steroid medications have also been known to increase intraocular pressure, and trauma to the eye can affect the production of aqueous humor, says AllAboutVision.com.