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Thursday, July 31, 2014
High blood pressure puts a strain on all the blood vessels in your body, including the delicate blood vessels inside your eyes. Although you may not notice any symptoms for many years, this can cause permanent damage to your eyes – even resulting in blindness.
The retina is light-sensitive tissue that lines the inside of the eye. It functions like the film inside a camera. Hypertensive Retinopathy is damage to this tissue caused by high blood pressures.
High blood pressure causes changes in your blood vessels. You have high blood pressure if the top number of your blood pressure is higher than 140, or if the bottom number of your blood pressure is higher than 90.
In the short term, blood vessels will try to control the blood flow by clamping down. At this stage, you are unlikely to notice any change to your vision.
Long term increases in blood pressure weakens and damages the blood vessels. High stress on vessel walls stretch out the smooth muscle layer. Eventually, the inner layer of the blood vessel breaks, and blood products leak into the vessel wall.
Vessels react by forming abnormal scar products, causing thickening of the vessel wall and narrowing of the inner space. These changes cause blood vessels to become leaky, weak, and abnormal – they may have areas of narrowing and outpouchings called aneurysms.
This can lead to blockage and bleeding of the vessels.
The longer you’ve had high blood pressure, the more likely you are to develop hypertensive retinopathy.
The risk factors are same as those for getting high blood pressure. These include:
Aside from eye disease, having chronic high blood pressure also puts you at risk for heart disease, vessel disease, and stroke.
Dilate Fundus Exam
Optic Nerve – the nerve that carries the information from the eye
Left - Early Changes in Hypertension; Right - Later Changes in Hypertension
Very high blood pressure that comes on suddenly is called malignant hypertension. It can cause blurry vision, headaches, change in mental status, shortness of breath, chest pain, and decreased urine output. This can be a life threatening condition, and you should call 911 or go to the emergency room if you have symptoms of malignant hypertension.
Immediate symptoms may include headache, eye pain, blurry vision, change in mental status, shortness of breath, chest pain, and decreased urine output.
This can be a life threatening condition, and you should call 911 or go to the emergency room if you have symptoms of malignant hypertension
If you have malignant hypertension, you will most likely stay in the hospital and take medications to lower your blood pressure until it is under control. Your doctor will also order some tests to see if damage has been done to your kidneys, heart, lungs, eyes, and brain.
Luckily, symptoms often improve with blood pressure control. However, damage to the optic nerve and macula can cause permanent decrease in vision.
Prepared in partnership with Lily Huang, MD, Class of 2013, Case Western Reserve University School of Medicine.
Last Reviewed: Oct 01, 2012
Suber S Huang, MD, MBA
School of Medicine
Case Western Reserve University