With age, and in my case from an injury, the gel or "vitreous fluid" of the inside of the eye can break loose and cause "floaters." These appear as dark spots that float around and sometimes in front of the visual field. They are harmless unless they attach to the back of the retina. (Which is very rare)

This attachment is a painful experience, can cause detachment of the retina, and can also include something like a blanket being pulled down over your vision in the eye. Get to your opthalmologist immediately, so he can hopefully prevent blindness in the eye.

I have regular eye check ups, every 6 months just for the doctor to keep track of all the floaters I have from my head injury.

Hope this helps! (((hugs))) (Did you google it?)