I am sorry to heard it. Since you feel blurry vision from the hit, you may have a contusion. That is to say that you got a brusie on the brain because of the hit. See a doctor as soon as possible. Check your eyes right now in case that you got more unknown and serious injuries from the hit. Hope you will be OK soon.
Actually this is very hard to answer.Because I am not sure how bad ur eye got hurt.First of all,u need to know that no matter u get hurt badly or just get hurt slightly.It is very normal that u get blurry vision after ur so called hit.If it is just a slight hit,then u don't need to worry too much.U might as well give urself a cool compress and rest ur eyes for about one hour or two.And then ur vision will just go back to normal.However,if u think u really get hurt that bad,then I can only strongly suggest u to go to see an eye doctor as soon as possible.
As far as i know, people got optic nerve injury from an accident that probably suffered from vision blurred. This is because optic nerve injury can cause a range of vision changes by affecting all aspects of sight. But don't worry too much. Usually, blurry vision from a head hit is normal. And some slight hit can cause blurry vision for a minutes and won't cause serious damage. But if you feel blurry vision for a long time, you must go a hospital and have your head checked.