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The sudden onset of flashing lights, a noticeable increase in the amount of floaters, a shadow in your peripheral vision, or a gray curtain moving across your field of vision could be signs of a detachment of the retina â the nerve layer in the back of the eye that sends images to the brain.
There are many causes of double vision (diplopia), but sudden-onset, transient double vision is a different animal and almost always points to an underlying, very serious problem. For example, this is a possible symptom of a mini stroke (TIA: transient ischemic attack).