I think my baby poked himself in the eye.m because it had a red spot nearing his mid-eye. :( how do I deal with this? Can it gravely affect his eyesight?

Oh no! I suggest you observe your baby first. Is he a bit uncomfortable? If your toddler cried and screamed after poking his eye, it must be a sign that it was painful. However, better call or visit his pediatrician to assure that no infection has been made.