When you see an "eye floater," you're not actually seeing the floater itself, but the shadow it casts on the retina. These floaters are perfectly normal and benign. They move with your eyes, which is why it seems impossible to focus on them.
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Key Facts In This Video
The vitreous in your eye is about 99% water and 1% collagen. 01:01
Eye floaters are neutrally buoyant, so they don't actually float. 01:52
Multiple new eye floaters and bright flashing lights could be symptoms of a retina that's about to detach. 03:20