causes of floaters
Eye floaters can appear as black or gray dots, lines, cobwebs, or blobs. Occasionally, a large floater may cast a shadow over your vision and cause a large, dark spot in your sight. Because the floaters are inside the fluid of your eye, they will move as your eyes move. If you try to look right at them, they will dart out of your vision. Eye floaters commonly appear when you stare at a bright, plain surface, such as the sky, a reflective object, or blank paper.