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Increased intracranial pressure (the pressure of the fluid around the brain) can cause momentary lapses of vision especially when moving, such as standing from a sitting position.People which this problem may notice temporary dimming of vision affecting both eyes, and possibly imbalance. Retinal migraine is a spasm of the artery leading into the eye which supplies the retina.Sometimes even eye movements are enough to induce a temporary loss of vision.
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This spasm can lead to a temporary black-out of vision on one side, and is fairly rare. Retinal Artery Occlusion (Central Retinal Artery Occlusion and Branch Retinal Artery Occlusion) If a clot (embolus) breaks free from the wall of a blood vessel leading up the neck or to the eye, it can lodge in the retinal arteries causing an obstruction of blood flow to the eye, and a loss of vision. In some cases, the clot will rapidly dislodge, and the vision will return (Amaurosis fugax, discussed above). However, if the clot is large it may not dislodge, and the vision remains blacked-out. Usually this is painless, and the loss of vision is severe. The vision in this condition may be reduced to being completely unable to see light out of the affected eye.