Unless you have showers of floaters, flashes of bright light, loss of central or peripheral vision you should not need a re-exam. Floaters themselves are generally benign. By age twenty about 1 in 5 people have floaters and by age 50 its 1 in 2.
Big floaters and cobweb floaters are the most common benigh floaters. What is a danger signal is sudden changes, showers of tiny floaters like soot or ink in the eye.
The main risk factors for RD are family history, high myopia, severe trauma, previous cataract surgery, weak areas in the eye like holes, tears, lattice degeneration. There are racial differences, retinal detachments are less common in blacks but glaucoma is more common.
JCH III MD