There is no known prevention for floaters and flashes which are usually age-related, and in most cases benign. Flashes usually diminish with time (over weeks to months), and floaters may reduce somewhat over time, but usually persist in the long-term. If you experience floaters and flashes in your eye, it is important to have your eyes examined and checked by an eye specialist to determine the cause, and exclude retinal tears, detachments, or other serious conditions.