Any treatments for persistent visual snow?

Treat The Cause: There are numerous causes of visual snow. Determining the cause may lead to a treatment, but there is currently no single treatment for visual snow or any treatment that works well.

Usually not treated: I assume, that you mean "floaters". Generally, people get used to them and no treatment is recommended or necessary. In rare circumstances a vitrectomy may be done, where most of the vitreous is removed, with the offending floaters.