Floaters are very common and may look like clouds, strands, webs, spots, squiggles, wavy lines or other shapes and often move in the field of vision. As the eye ages, the gelatinous vitreous humor begins to liquefy in the center of the gel. Floaters are caused by the undissolved vitreous humor that floats in the liquid vitreous. Sometimes, a “shower of floaters” is a sign of a serious condition, particularly if you also see flashes of light. Floaters are more commonly seen in short-sighted eyes.