Blurry vision may be a sudden medical emergency. But even if it's not an emergency, the problems that cause vision changes ... the lens goes from clear to cloudy. The cloudiness is caused by ...

Retinal swelling that then occurs can cause blurred or cloudy vision ... It can lead to a sudden loss of vision. But if this vision loss is not in the center of the retina, it may go unnoticed.

o Rare but serious causes: Brain tumors or sudden-onset stroke. Seek emergency care immediately if vertigo occurs with numbness, vision changes, slurred speech, or sudden falls. Wooziness ...