it is better from the stand point that they will know exactly where to look for injury as for long term effect no clue until diagnosis.. hopefull you did something to the trapezius muscle which originates at the occipital bone (lower backside of skull) but from the the vision being blurred it doesnt sound like it although pressure could be building on the base of brain and spinal cord... no telling man not a doctor just have know basic knowledge of body.... does it hurt to turn your head from side to side?