From the history what you have written it is clear that you have injury
to the eye following which you had retinal detachment
, for which you have undergone surgery.
Regarding your first question regarding improvement in vision, it depends on the treatment of retinal detachment and whether it involved the macula or not. Many factors are involved in this hence nature of injury surgical course after treatment, hence more history and facts are required to tell about visual prognosis.
Regarding second question, white fluid in the eye, it is not related to your preexisting eye condition it may be because of common infections like conjunctivitis
. This can be treated by antibiotic eye drops.