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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.
Of these risk factors, the only one your doctor can treat is eye pressure. High eye pressure alone does not cause glaucoma. Most people with elevated eye pressure do not have and may never develop glaucoma.