Medial collateral ligament (MCL) and lateral collateral ligament (LCL)
Yeah I think they are called retina specialists
Because humans have five senses: feel, see, taste, hear, and smell. When you step on a nail you basically going to feel it and you brain can sense that and it can trigger nerves which can cause pain.
I think you should go to a chiropractic or tell somebody or go to the doctor if ur young I suggest telling your parents