Sometimes floaters will go through your eye and you won’t even notice, because your brain is hard-wired to adapt your vision to environmental changes.
Other times, floaters can be quite alarming. Dots and lines going across your vision might make it difficult to concentrate and cause confusion, and the rest of your vision can become blurry if you’re worried and focusing on the floaters.
Generally, floaters are nothing to worry about – even if they are a hassle. They are caused by debris floating into your eyeball.
The eyeball is coated in a jelly-like substance which the debris floats on top of, so having floaters in your eye shouldn’t do you any harm.
What they will do is cast a shadow on your retina by blocking out a section of the light that is going into your eye – this is what causes the dark spots.