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Glaucoma is characterized by optic nerve damage which results in vision loss, and elevated eye pressure (intraocular pressure) is the primary risk factor. There is growing evidence that other factors may predispose a person to glaucoma damage, including circulation to the eye and optic nerve.
High eye pressure can be safe or it can cause optic nerve damage (glaucoma). [Enlarge] You can't tell by yourself that you have ocular hypertension, because there are no outward signs such as eye pain or red eyes.