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and what is a floater? can't be removed it?

Floaters are caused by something happening in the vitreous (inner eye) which cast shadows on your retina. The shadow moves around, thus the name floaters. Some come from age, but mine was caused by an injury to the inner eye from the violent coughing when I had Covid. The shadow if severe enough seems to interfere with vision. My right eye also has one, but it seldom causes a problem.

I have heard surgery is possible but it is very delecate.

oh then it's better to leave it like that.