Most often, the spots are caused by changes to the vitreous or vitreous humor, the clear gel between the lens and retina, at the back of the eye. This gel becomes more liquid as we age and microscopic fibers may start to clump together to form shreds. These clumps cast shadows and those shadows are what you're seeing, not the clumps themselves. These shadows move as your eyes move because the clumps are inside the fluid in your eye.
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