It definitely could be concussion related. I had vision therapy after my concussion. Please be sure that you have a vision efficiency evaluation, not just a medical eye exam. They will check how well your eyes are working together.

My medical eye exam was completely normal, but my eyes were having trouble working together.

I found my vision therapist through this website, which also has good info on problems that could be caused by brain injury: http://www.braininjuries.org/