Johnson's autobiography The Rock Says..., co-written with Joe Layden, was published in 2000. It debuted at No. 1 on The New York Times Best Seller list, spent 20 weeks on The New York Times bestseller list and sold 720,000 copies in hardcover alone.
1 Posterior uveitis, which can cause eye floaters, may be caused by infection or inflammatory diseases, among other causes. 2  Bleeding in the eye. 3  Bleeding into the vitreous can have many causes, including injury and blood vessel problems. 4  Torn retina.
They are caused when pieces of debris floating in the jelly-like substance of the vitreous humor, which fills the middle of an eyeball, cause shadows on the retina at the back of the eye.While rarely a cause for concern, they can be annoying enough for some to want to learn how to reduce floaters.hey are caused when pieces of debris floating in the jelly-like substance of the vitreous humor, which fills the middle of an eyeball, cause shadows on the retina at the back of the eye.