Sudden changes in vision upon awakening may portend a serious stroke.
The sudden stoppage of blood flow to the brain can manifest itself in one of several ways, depending on which part of the organ is affected. Sometimes the blood supply to the eyes is cut off, causing an ocular stroke. Although this condition is treatable, if diagnosed early, it may herald a more serious stroke.
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Sometimes these blockages cause sudden changes in vision such as blurring, dark areas or shadows.
Ocular (eye) strokes may herald a more serious stroke. When an ocular stroke occurs, it almost always happens in only one of the eyes.
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Fortunately, vision returns in 80% of cases with less severe blockage of small arteries. However, this condition remains dangerous, as the lack of blood flow to the tissues located in front of the optic nerve can have serious consequences for vision if treatment is delayed.
The optic nerve transmits signals to the brain and carries millions of nerve fibers and blood vessels. When it becomes completely cut off from the supply of nutrients and oxygen, nerve tissue is damaged, which can lead to vision loss.
“People with ocular stroke usually receive little warning. Most people with an ocular stroke notice vision loss in one eye upon waking in the morning without pain. Some people notice a dark area or shadow in their vision that affects the upper or lower half of their visual field. Other symptoms include loss of visual contrast and photosensitivity,” says neurologist Alexandra Alyokhina, especially for MedikForum. Some people may have a higher risk of the disease due to the shape of their discs. This is because the nerve fibers leading to the brain and down the optic nerve must enter the eye through an opening known as the optic fistula. If a person's opening is smaller than average, this can lead to congestion of the optic nerves.
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