A sudden loss of vision or partial loss of vision in one eye is an urgent warning sign of dysfunction of the blood vessels. This sort of change may involve the entire field of vision in one eye or it may affect only a part of the field of vision. A patient may experience the sensation of a curtain descending over one eye with a fading of vision. The term that physicians use for this condition is amaurosis fugax. A more common term is transient monocular blindness or fleeting blindness involving only one eye.
