I have a history of a retinal detachment and has had constant severe blurred vision in the same eye. should i worry?

Be evaluated: Not a good idea to sit around and worry. If there is some unexplained change in the feeling or function especially in an eye which has had difficulty in the past, then see your ophthalmologist right away and relieve your mind as well as discover if there is a treatable problem.

Depends: If this is new you must get checked immediately. If you have always had poor vision in that eye then it may stay that way. Ask your retina specialist.