I know it was bug, but you should try implementing the face parasites as equipment, just like the chest and crotch ones.
For gross solution is that the meat parasite penetrates your eye hole and connects with your eye nerve directly so you can see. For normal solution is that there are some gaps between the parasite so you can see through. For talk, the meat parasite only fuck your face and lay eggs in your mouth and stomach when it feels like it, so you can talk when it is happy.