MWS,

I doubt that people are staring at you and your sunglasses. PCS often causes obsessive thoughts and you may have developed a sensitivity to how other may perceive you. There is a saying, "If we only knew how little others think about us, we would not worry so much about what they are thinking about us"

If you notice someone starring at your sunglasses, you could say, I am photosensitive due to a concussion/brain injury. I doubt anyone would doubt you.

My best to you.