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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.
On a daily basis this can increase or decrease due to exercise, stress, fluid consumption and even caffeine. If eye pressure is consistently over 21, then you may have ocular hypertension. If increased eye pressure leads to glaucoma, the optic nerve can become damaged and there is a heightened risk of blindness.