Floaters are small specks or clouds moving in your field of vision as you look at a blank wall or a clear blue sky. Most people have some floaters normally but do not notice them until they become numerous or more prominent.
In most cases floaters are part of the natural aging process. Floaters look like cobwebs, squiggly lines or floating bugs, and appear to be in front of the eye, but are actually floating inside. As we get older, the vitreous (gel-like substance that fills the inside of the eye) tends to shrink slightly and detach from the retina, forming clumps. What you see are the shadows these clumps cast on the retina, the light-sensitive nerve layer lining the back of the eye.