Hello and thanks for your question. What you are experiencing is called a vitreous floater. These floating spots or "black spots" are tiny pieces of the vitreous jelly that occupies a large amount of the volume of the back of the eye. This vitreous jelly, when we're born, is the consistency of a jello jiggler (thick jello). As we age it liquifies and becomes more fibrous bands and water.
Because of this liquification and the resultant fibrous bands that are left, there becomes more points of traction that the jelly exerts on the back of the eye where it is attached. As we move our eyes in different directions and as our pupils change shape, or even as we rub our eyes, some of these bands can become unattached from the back of the eye and a piece of it floats around, attached still to the rest of the jelly. These vitreous floaters do tend to happen more the older we get, but can happen at a young age.
Unfortunately, there is nothing that really can be done to definitively rid yourself of these floaters besides major surgery. Therefore, surgery to remove these floating spots is usually reserved for when they floaters are large or are significantly disrupting your vision and causing problems in your life. Thankfully, these floaters usually tend to get "better" in that either: 1) the brain learns how to ignore them, or 2) they break up somewhat, or 3) they drift out of your view.
Does that help answer your question?
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.