Floaters is a phenomenon of natural aging, it is visual impairment which mainly caused by vitreous degeneration. vitreous body will have some turbidity with increasing age. Whether it can lead to blindness, it mainly depends on retina. If your retina has bleeding hole, it is inflamed, even has retinal detachment, and you have the situation of seeing a whole piece of black, it may lead to blindness. You should have a surgery quickly.
Yes, it maybe. people with floaters are caused by bleeding from the abnormal growth of blood vessels that can suffer one or more hemorrhages inside the eye that may severely affect vision. Besides, the abnormal blood vessel will further leads to scar tissue that tends to shrink. And the shrinkage can cause wrinkling, dragging, distortion, detachment and/or tearing of the retina,thus called blindness.
Floaters is a normal condition with age. They will become less noticeable over time if it is not serious. As long as the floaters don't affect your vision, there is no need to worry about it. However, if you find somethig serious suddenly, you should go to see a doctor immediately. Once your vision is affected by floaters and you can hardly focus on the objects, you should go to see a doctor to have your eyes checked. If it is untreated in time, it may lead to blindness.