andy,

I think you need to ask this question of an eye doctor (ophthalmologist) or other specialist. If you can, put it at the top of your list until you can get a professional opinion. When someone comments, you can respond, " I don't know why they are so dilated. I am recovering from a brain injury. I am waiting to get a doctor to help me understand." They will likely understand.

This will help you disarm their comment and concern.