Double vision is diagnosed when a person sees two clear pictures of the same image. This differs from blurry vision, in which vision is distorted. Double vision--diplopia--can affect one or both eyes. This symptom can occur due to structural deformities or problems with the nerves or muscles of the eye as well as cardiac issues. If double vision occurs, it is important to seek medical attention to rule out a serious underlying condition.
High Blood Pressure
High blood pressure that is not well controlled can eventually damage blood vessels in the body, including those that supply the eyes. Over time, this pressure on the vessel walls can cause changes in eye sight, such as double vision, warns Johns Hopkins' Health Alerts.
When the cause of double vision is high blood pressure, lifestyle changes and/or medication usually are necessary to bring blood pressure readings back to healthier levels.
Stroke
A stroke occurs when an artery within the brain ruptures or a blood vessel that supplies the brain becomes blocked. Blocked blood vessels account for approximately 80 percent of all strokes.
The warning signs that a stroke is occurring include weakness on one side of the face or body, trouble speaking or understanding speech, dizziness and loss of muscle coordination. Changes in vision such as a loss of sight or double vision are other warning signs, according to the National Institute of Neurological Disorders and Stroke. Immediate medical attention help minimize the damage of a stroke.
Cerebral Aneurysm
An aneurysm occurs when a blood vessel becomes abnormally wide or balloons out. This widening happens because there is a weakness in that part of the blood vessel. Aneurysms that affect the brain or cerebral aneurysms can be congenital or may be the result of trauma, infections or cardiovascular disease.
Aneurysms can exist without ever causing symptoms until they burst. However, some patients experience double vision, severe headaches, confusion, or drooping eyelids, according to MedlinePlus, a service of the National Institutes of Health. A ruptured cerebral aneurysm is an emergency that requires immediate medical attention.
