swim before eyes
swim before (one's) eyes
To appear in or cloud one's vision. Usually said of floaters (clumps of fibers in the eye) or rings, spots, or flashes of light (called phosphenes). I stood up too quickly, causing flashes of light to swim before my eyes. A: "My daughter's had these floaters swimming before her eyes recently." B: "Isn't she a bit young for that to be happening?"
swim before someone's eyes
Fig. [for something, such as spots or visions] to appear in one's field of vision. I was getting feverish and spots swam before my eyes. Visions of total destruction swam before my eyes as the bus skidded in the snow.