Can posterior ethmoid mucocele put enough pressure on eye to cause eye floaters?

Unlikely. These lesions gradually put more pressure on the eye if they break through the bone barrier between the orbit and the ethmoid sinus. This will not cause floaters although if the eye is being pushed out of position, it might cause existing floaters to be more noticeable. An ENT doctor can help with removal of this mucocoele.

Unlikely. Unlikely. See ENT doc for treatment of sinus. Eye doc for floaters.