Floater - Wikipedia, the free encyclopedia: "Floaters are suspended in the vitreous humour, the thick fluid or gel that fills the eye.[4] Thus, they generally follow the rapid motions of the eye, while drifting slowly within the fluid. When they are first noticed, the natural reaction is to attempt to look directly at them. However, attempting to shift one's gaze toward them can be difficult since floaters follow the motion of the eye, remaining to the side of the direction of gaze. Floaters are, in fact, visible only because they do not remain perfectly fixed within the eye."
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