Stroke / Brain Trauma Can Cause Vision Loss
Vision loss can be both a symptom and result of a stroke. Temporary vision loss can be a sign of impending stroke and requires immediate medical attention. Learn about how stroke may affect vision and what to do about it.
Following a stroke, you might experience problems with your vision, but you are not alone. Up to two thirds of people experience some changes to their vision after a stroke. Having trouble with your vision can be distressing and it can affect the rest of your recovery. For example, you may not be able to walk confidently if you cannot fully see where you are going. Like other effects of stroke, visual problems do often improve in time as the brain recovers.
What are some problems after stroke?
A stroke can cause a number of vision problems—also called visual disturbances. There are many types of vision problems and possible treatments for them. How you are affected depends on exactly where the stroke occurred in your brain. Post-stroke vision problems can fall into one of two general categories, vision loss or perception problems.
Vision Loss
Vision loss also known as visual field loss, is common after stroke. Frequently it is experienced as blind spots in the field of vision. Specific visual field loss conditions are named based on the location and size of the visual loss. Different types of visual field loss include:
Vision Perception Problems
Damage to your brainstem and/or cerebellum makes it difficult to process what the eye sees, also known as vision perception problems. You may find it difficult to coordinate movement and focus your eyes resulting in double vision. It may affect your ability to blink, resulting in dry eyes. You may experience a variety of vision perception problems, depending on where the stroke occurs in your brain.
Common perception problems include:
The brain stem houses three pairs of nerves that control your eye movement. If they are damaged and do not allow one or both eyes to move together, you may experience double vision and visual midline shift.
Perception problems that result from brain stem damage are called ocular motility (or movement) impairments. For example, double vision results when your eyes are not able to work together to move into the correct position. Damage to the cerebellum can impair your ability to coordinate looking in the same direction with both eyes.
Both the brain stem and cerebellum play a role in sensation. Damage to these areas can lead to loss of feeling, which makes blinking difficult and causes blurry vision or visual neglect.
Following a stroke, you might experience problems with your vision, but you are not alone. Up to two thirds of people experience some changes to their vision after a stroke. Having trouble with your vision can be distressing and it can affect the rest of your recovery. For example, you may not be able to walk confidently if you cannot fully see where you are going. Like other effects of stroke, visual problems do often improve in time as the brain recovers.
What are some problems after stroke?
A stroke can cause a number of vision problems—also called visual disturbances. There are many types of vision problems and possible treatments for them. How you are affected depends on exactly where the stroke occurred in your brain. Post-stroke vision problems can fall into one of two general categories, vision loss or perception problems.
Vision Loss
Vision loss also known as visual field loss, is common after stroke. Frequently it is experienced as blind spots in the field of vision. Specific visual field loss conditions are named based on the location and size of the visual loss. Different types of visual field loss include:
- Hemianopia means blindness in one half of the visual field. A stroke that occurs in the left hemisphere of your brain can inhibit the ability to see the right visual field of each eye, while right hemisphere stroke can impair the left visual field of each eye. The most common form of this is homonymous hemianopia, which means that your vision loss is on the same side of each eye. Research shows that eight to ten percent of stroke survivors have homonymous hemianopia.
- Quadrantanopia means blindness in a quarter of your visual field.
- Scotoma refers to an island-like area of blindness, typically smaller than hemianopia or quadrantanopia.
- Tunnel vision means that your peripheral vision is lost. Medically, this is known as bitemporal hemianopia. The outside half of the visual field in each eye is blind.
Vision Perception Problems
Damage to your brainstem and/or cerebellum makes it difficult to process what the eye sees, also known as vision perception problems. You may find it difficult to coordinate movement and focus your eyes resulting in double vision. It may affect your ability to blink, resulting in dry eyes. You may experience a variety of vision perception problems, depending on where the stroke occurs in your brain.
Common perception problems include:
- Double vision or seeing two of one thing.
- Visual midline shift where the center point in your line of sight is perceived as having shifted either left, right, above or below where it really is. As a result, you may become dizzy and may tilt your body to the right or left in order to compensate.
- Visual neglect, also called inattention, is when you ignore objects in a certain area. Visual neglect can cause you to eat food from only one half of your plate or shave only half your face. Stroke survivors with visual neglect often recover completely.
- Other visual perception problems include depth and distance perception, color detection problems, dizziness, hallucinations, and failure to recognize common objects, which is called agnosia.
The brain stem houses three pairs of nerves that control your eye movement. If they are damaged and do not allow one or both eyes to move together, you may experience double vision and visual midline shift.
Perception problems that result from brain stem damage are called ocular motility (or movement) impairments. For example, double vision results when your eyes are not able to work together to move into the correct position. Damage to the cerebellum can impair your ability to coordinate looking in the same direction with both eyes.
Both the brain stem and cerebellum play a role in sensation. Damage to these areas can lead to loss of feeling, which makes blinking difficult and causes blurry vision or visual neglect.