Generally speaking. Concussion can make the eyesight go down even lose it, but it don't cause the sensitivity to light. Concussion may cause Intracranial bleeding and the intracranial clot will constrict optic nerve. If it can't be cleaned up, it will cause losing your sight.
Well, yes, concussion can just cause sensitivity to light in some degree. According to some doctors, when you have a concussion, your brain function is temporarily affected. And at the same time, it will also have some effect on eyes, leading to some changes in your eyes too. For example, it will make your eyes have sensitivity to light. Also, blurred vision, double vision can be possible. And with the recovery of concussion, these symptoms will go away, so you do not need to worry about it.
Yes, it is possible for you to get sensitivity to light from a concussion because of the interlinked nerves at the eyes and head parts. Your headache could also cause your eyes problems. You should have the good rest for the eyes. In addition, you could also wear the sunglasses under the sun which could protect your eyes from the uv rays and other bad lights.