It sounds like you hit your head twice- once to the side of the face.. misalignment of c1 c2 can be a factor.
Have you seen information on NUCCA , atlas /axis, c1 c2 adjusting?
Up C Spine has good info that explains it..
explore the whole site - this is interesting - Up C Spine - A New Approach - Sign / Symptom Checklist
videos on you tube show this adjustment if you want to see how it is done..

Much of the vision issues are due to the brain, your eyes are most likely fine.