High blood pressure and eye disease
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Hypertensive retinopathy is damage to the retina from high blood pressure. The retina is the layer of tissue at the back part of the eye. It changes light and images that enter the eye into nerve signals that are sent to the brain.
High blood pressure can damage blood vessels in the retina. The higher the blood pressure and the longer it has been high, the more severe the damage is likely to be.
You have a higher risk of damage and vision loss when you have diabetes, high cholesterol level, or you smoke.
Rarely, blood pressure readings suddenly become very high, but when they do, it can cause severe changes in the eye.
Other problems with the retina are also more likely, such as:
Most people with hypertensive retinopathy do not have symptoms until late in the disease.
Symptoms may include:
Sudden symptoms are a medical emergency.
Exams and Tests
Your health care provider will use an ophthalmoscope to look for narrowing of the blood vessels and signs that fluid has leaked from blood vessels.
The degree of damage to the retina (retinopathy) is graded on a scale of 1 to 4:
- Grade 1: You may not have symptoms.
- Grades 2-3: There are a number of changes in the blood vessels, leaking from blood vessels, and swelling in other parts of the retina.
- Grade 4: You will have swelling of the optic nerve and of the visual center of the retina (macula). This swelling can cause decreased vision.
Fluorescein angiography may be used to examine the blood vessels.
People with grade 4 (severe retinopathy) often have heart and kidney problems due to high blood pressure. They are also at higher risk for stroke.
In most cases, the retina will heal if the blood pressure is controlled. However, some people with grade 4 retinopathy will have lasting damage to the optic nerve or macula.
When to Contact a Medical Professional
Get emergency medical treatment if you have high blood pressure with vision changes or headaches.
- Last reviewed on 9/2/2014
- Franklin W. Lusby, MD, ophthalmologist, Lusby Vision Institute, La Jolla, CA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
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This page was last updated: May 4, 2015