You may sometimes see small specks or cloud moving in your field of vision. They are called floaters. You can often see them when looking at a plain background, like a blank wall or blue sky.
Floaters are actually tiny clumps of gel or cells inside the vitreous, the clear jelly-like fluid that fills inside of your eye.
They become more common with age, with near-sightness, after cataract operations, laser surgery, and inflammation inside the eye.