If you've heard about eye floaters, you must know that they look like black or gray specks, strings, or cobwebs that drift about when you move your eyes and appear to dart away when you try to look at them directly. These floaters are age-related changes that occur as the jelly-like substance inside your eyes becomes more liquid. These microscopic fibers within the vitreous tend to clump and can cast tiny shadows on your retina. The clouds you see are called floaters.  If there's a sudden increase of these floaters as your vision becomes more shadowed or cloudy, it's time to visit the doctor.