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Ocular ischemic syndrome is the constellation of ocular signs and symptoms secondary to severe, chronic arterial hypoperfusion to the eye. [1] Amaurosis fugax is a form of acute vision loss caused by reduced blood flow to the eye; it may be a warning sign of an impending stroke, as both stroke and retinal artery occlusion can be caused by thromboembolism due to atherosclerosis elsewhere in the ...
Changes in the eye can help predict other health concerns in the body, such as diabetes and high blood pressure. A new study has identified a set of 29 vascular health indicators on the retina ...
Impaired blood flow to the cells of the occipital lobe (ischemia, for example as caused by a TIA or Vertebrobasilar insufficiency) will lead to temporary visual problems; if the poor blood flow is sustained it will lead to cell death (infarction, for example as caused by a stroke) which may cause persistent visual problems.
The most common cause of cortical blindness is ischemia (oxygen deprivation) to the occipital lobes caused by blockage to one or both of the posterior cerebral arteries. [2] However, other conditions have also been known to cause acquired and transient cortical blindness, including: Congenital abnormalities of the occipital lobe [5]
In children, the most common cause is a stroke of the ventral pons. [9]Unlike persistent vegetative state, in which the upper portions of the brain are damaged and the lower portions are spared, locked-in syndrome is essentially the opposite, caused by damage to specific portions of the lower brain and brainstem, with no damage to the upper brain.
Lesions anywhere in the abducens nucleus, cranial nerve VI neurons, or interneurons can affect eye movement towards the side of the lesion. Lesions on both sides of the abducens nucleus can cause a total loss of horizontal eye movement. [6] One other type of gaze palsy is a horizontal saccadic palsy.
Dara Lehon saw spots, blurriness with migraine. PFO caused her rare eye stroke, retinal artery occlusion. Eye stroke is painless, quick loss of vision in 1 eye.
NAION is the most common cause of sudden optic nerve-related vision loss, affecting more than 10,000 Americans every year, often bilaterally. No clinically effective treatments exist, largely because little is known about its pathophysiology, and there are few histopathological studies of the acute condition.
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