What does it mean when you see black dots in your vision?

Black dots: There are many possible causes for black dots. Black dots may be due to floaters due to normal aging changes of the vitreous in the back of the eye, a vitreous hemorrhage, or a visual field defect (loss of part of the vision) from a stroke-like episode. Black dots could be a sign of a retinal tear or detachment. If you are currently seeing a new black dot, see an eye doctor immediately.

Floaters: It sounds as if you have had a posterior vitreous detachment. This is a situation where the vitreous(jelly) of the eye detaches (not a retinal detachment), it then "crumples" up leaving dots, spots, strands of blurry vitreous; i.e. The "floater". You should have an exam to ensure the incident did not tear the retina, which could lead to a retinal detachment.