This is a floater in the left eye indicating a posterior vitreous detachment. Our eyes are fille dup with a bag of gel that goes up against the back wall of the eye like wallpaper. At some point in most patient’s eyes the bag falls off the back of the eye. This floater is where the bag was against the optic nerve. It is called a Weiss’ Ring. People say they notice it less and less as time goes by. For those that are bothered by floaters a lot, surgery is an option.