The doctor likely noticed a weak pupil constriction response or maybe nystagmus . Nystagmus is when the eye jumps as it tries to move. The common test is horizontal nystagmus. The doctor asked you to follow his pen as he moves it from side to side. The pupil response is done by flashing the flashlight at the eye and watching the speed of pupil contraction. A slow reaction is a positive sign of head injury.

Migraine Associated Vasculopathy is a very broad term. It just means the vasculature in the brain is irritated (maybe dilated) and causing migraines. It is common for a concussion to cause the brains vascular system to lose control over blood flow. This is why it is important to avoid a second concussion. The blood pressure can cause serious brain swelling when this happens.