Brief loss of vision, lasting for seconds or minutes, usually affecting one eye only and caused by the temporary blockage of a small blood vessel in the eye by emboli (particles of solid matter such as cholesterol or clotted blood). These are carried in the bloodstream from diseased arteries in the neck or, rarely, the heart. Attacks may be infrequent or they may occur many times a day. This symptom indicates an increased risk of stroke and requires medical investigation.
Amaurosis fugax |
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