I buzzed through this thread to check for the real danger--retinal tears.
Floaters are normal, but if you get a big one suddenly, or a long rope-like floater, go see your doctor immediately for referral to an ophthalmologist. It could be a sign that you have a retinal tear, which can be repaired. Not fixing a tear could lead to the retina detaching and that's not good for any photographer. High blood pressure, diabetes and other medical conditions can be the cause, or a sharp blow to the head, like being struck by ball.
As you get older the jelly-like fluid inside the eye shrinks and solidifies. As it adheres to the inside of the eye, a jolt can cause it to tear part of the retina away.
I've been through it. Had cyro and laser surgery to repair the tear. I'm a veteran and the VA identified the problem and had me fixed by the end of the day I walked in the door (although I had to drive from the clinic to the main hospital 80 miles away for the surgery).