High blood pressure can cause damage to blood vessels in the eyes. The higher the blood pressure and the longer it has been elevated, the more severe the damage is likely to be. Your health care provider can see narrowing of blood vessels and excess fluid oozing from blood vessels with the ophthalmoscope. The degree of retina damage (retinopathy) is graded on a scale of I to IV. At grade I, no symptoms may be present. Grade IV hypertensive retinopathy includes swelling of the optic nerve and visual center of the retina (macula), which can cause decreased vision.
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