<unk> s are little "cobwebs" or specks that float about in your field of vision. They are small, dark, shadowy shapes that can look like spots, thread-like strands, or squiggly lines.  These<unk> s are bits of cellular debris that come and go without treatment.
Floater
Boil
Wart
Stye
Wonder 
Slug
Atom
Spore