Most eye floaters are caused by age-related changes to the jelly-like substance (vitreous) inside your eyes. As the vitreous becomes more liquid, its microscopic fibers clump together and cast tiny shadows on the retina, which appear as floaters. Several medical conditions can also cause floaters.
The most effective methods of birth control are sterilization by means of vasectomy in males and tubal ligation in females, intrauterine devices (IUDs), and implantable birth control. This is followed by a number of hormone based methods including oral pills, patches, vaginal rings, and injections.
Birth Control Shot. The birth control shot, known as Depo Provera, is a hormonal injection that protects against pregnancy for three months. For the typical couple, it is more effective than the birth control pill -- only 3% of users get pregnant in a year. Pros: Only injected four times per year, highly effective. Cons: Cost (about $240 per year), may cause spotting and other side effects.