What kind of stroke affects the eyes?

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What kind of stroke affects the eyes?
Vision symptoms are sometimes caused by stroke - or impending stroke (also known as a transient ischemic attack, or TIA).If the optic nerve itself is affected by stroke, vision is severely affected. This is called ischemic optic neuropathy, and more commonly happens in patients with diabetes, high blood pressure, and other conditions affecting circulation. If the cranial nerves responsible for controlling eye movements lose their blood supply (a condition called ischemic cranial neuropathy), the two eyes will not work together properly and patients often experience double vision.Stroke refers to acute loss of blood supply (circulation) to any portion of the brain, resulting in irreversible brain damage and loss of bodily functions controlled by that portion. The eye is connected to the brain by the optic nerve. Also movement of the eyes is controlled by six pairs of muscles that are directly supplied by three nerves that emerge from the base of the brain. Because of this direct eye/brain connection, stroke frequently affects both vision and the ability to coordinate the movements of both eyes.If blood supply is disrupted only temporarily, patients may notice dimming of vision (like a window blind being drawn closed for a few seconds). These are classic symptoms of a TIA, and should alert of the possibility of an imminent stroke. If loss of circulation is longer lasting, these symptoms will be more pronounced and may last indefinitely – a stroke has occurred. Patients may lose a portion of their vision, depending upon the anatomical location of the blockage; if the back portion of the brain is affected (the occipital cortex), total loss of vision is possible.


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