As of June 2019, there are no real treatments. I know for me personally stress, anxiety and depression can agitate the static portion of VS (visual snow). My optometrist recommended mediation and yoga to help relax and although I haven't noticed a huge difference, it's generally been helpful not just for my VS.
It is also not uncommon for antidepressants / anxiety medication to help with the symptoms of VS, and I know for me it has been helpful.