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amaurosis fugax
amaurosis fugax A symptom that is often described as a shade coming down over the eye. Amaurosis fugax is a partial or complete loss of sight that is temporary. Amaurosis fugax is usually caused by arteriosclerosis in the blood vessels that supply the brain. It can also occur with excessive acceleration, as in flight, and with ophthalmic migraine. See also arteriosclerosis.